GB 5310 10Cr9Mo1VNbN high pressure seamless boiler tubes

GB 5310 10Cr9Mo1VNbN high pressure seamless boiler tubes

GB 5310 10Cr9Mo1VNbN is a low-alloy steel that is commonly used for making high-pressure seamless boiler tubes.

10Cr9Mo1VNbN is a type of low-alloy steel that is commonly used for producing high-pressure seamless boiler tubes. It is one of the steel grades specified in GB 5310-2008, a Chinese standard that defines the requirements for seamless steel tubes used in high-pressure boilers and pressure vessels.

The chemical composition of 10Cr9Mo1VNbN includes elements such as chromium, molybdenum, vanadium, and niobium, which provide excellent resistance to high-temperature oxidation, corrosion, and erosion. The "10Cr9Mo1VNbN" in the name refers to the chemical composition of the steel, which contains 10% chromium, 9% molybdenum, 1% vanadium, and 0.3-0.5% niobium.

10Cr9Mo1VNbN high-pressure seamless boiler tubes have a working temperature of up to 600℃ and can withstand pressures of up to 30 MPa. They are commonly used in various components of power plant boilers, including superheaters, reheaters, and water walls, among others.

Some of the key features of 10Cr9Mo1VNbN high-pressure seamless boiler tubes include excellent high-temperature strength and creep resistance, good corrosion resistance to various gases and liquids at high temperatures, high thermal conductivity and thermal shock resistance, good dimensional accuracy and surface finish, and high toughness and ductility.

10Cr9Mo1VNbN is a low-alloy steel that offers excellent high-temperature properties and resistance to corrosion and erosion. It is widely used in power plant boilers, where it plays a critical role in ensuring safe and reliable operation under high-pressure and high-temperature conditions.

Manufacturing methods

(1)Steel smelting method
GB 5310 10Cr9Mo1VNbN steel will be smelted by electric furnace plus furnace refining, oxygen converter plus furnace refining or electroslag remelting method.

(2)Manufacturing methods and requirements for tube blanks
The 10Cr9Mo1VNbN tube blank can be produced by continuous casting, die casting or hot rolling (forging).

(3)Manufacturing method of steel tube
GB 5310 10Cr9Mo1VNbN Steel tubes shall be manufactured by hot rolling (extrusion, expansion) or cold drawing (rolling).

GB 5310 20MnG is another low-alloy steel that is commonly used for making high-pressure seamless boiler tubes.

Chemical composition of GB 5310 10Cr9Mo1VNbN high pressure seamless boiler tubes

Steel Grade C Si Mn S P Cr Mo V Ti B W Ni Al Nb N
10Cr9Mo1VNbN 0.08-0.12 0.20-0.50 0.30-0.60 0.01 0.02 8.00-9.50 0.85-1.05 0.18-0.25 　 　 　 ≤0.040 ≤0.040 0.06-0.10 0.03-0.07

Mechanical properties of GB 5310 10Cr9Mo1VNbN high pressure seamless boiler tubes

Yield strength (≥Mpa)

415

Tensile strength (≥Mpa)

585

Application of GB 5310 10Cr9Mo1VNbN high pressure seamless boiler tubes:

GB 5310 10Cr9Mo1VNbN high-pressure seamless boiler tubes are widely used in various components of power plant boilers, including superheaters, reheaters, and water walls, among others.

  1. Superheaters: 10Cr9Mo1VNbN high-pressure seamless boiler tubes are used to construct superheaters in power plant boilers. Superheaters increase the temperature of steam to improve the efficiency of the power plant.
  2. Reheaters: Similarly to other low-alloy steels, 10Cr9Mo1VNbN high-pressure seamless boiler tubes are also used to make reheaters in power plant boilers. Reheaters reheat the steam after it has passed through the turbine's first stage.
  3. Water Walls: The water walls in a power plant boiler are a series of metal tubes filled with water that absorb heat from the combustion process. 10Cr9Mo1VNbN high-pressure seamless boiler tubes are used to construct these water walls, which help to maintain the structure of the boiler and ensure efficient heat transfer.
  4. Other high-pressure components: In addition to superheaters, reheaters, and water walls, 10Cr9Mo1VNbN high-pressure seamless boiler tubes are also used to make other high-pressure components such as headers and economizers, among others.

The working pressure for the use of 10Cr9Mo1VNbN high-pressure seamless boiler tubes is typically above 9.8 MPa, and the working temperature is between 450℃ and 600℃. The quality and performance of these tubes are critical for ensuring safety and reliability in power plant operations.

In summary, 10Cr9Mo1VNbN high-pressure seamless boiler tubes are essential components in power plant boilers, where they play a crucial role in facilitating the transfer of high-pressure steam throughout the system. These tubes offer excellent mechanical properties, durability, and resistance to corrosion and oxidation at high temperatures, making them suitable for use in harsh industrial environments.

The main features of GB 5310 10Cr9Mo1VNbN high-pressure seamless boiler tubes are as follows:

  1. High-temperature strength and creep resistance: 10Cr9Mo1VNbN contains chromium, molybdenum, vanadium, and niobium, which provide excellent high-temperature strength and creep resistance. These properties make the tubes reliable in high-temperature and high-pressure applications.
  2. Resistance to corrosion and erosion: The composition of 10Cr9Mo1VNbN also includes elements that offer good resistance to corrosion and erosion at high temperatures. This makes the tubes suitable for use in harsh industrial environments where exposure to corrosive gases and liquids is common.
  3. Good thermal conductivity and thermal shock resistance: 10Cr9Mo1VNbN high-pressure seamless boiler tubes have good thermal conductivity, which helps to transfer heat efficiently in power plant boilers. Also, they possess excellent thermal shock resistance, which allows them to withstand rapid temperature changes without failure.
  4. Good dimensional accuracy and surface finish: The manufacturing process for 10Cr9Mo1VNbN high-pressure seamless boiler tubes produces precise dimensions and tolerances, ensuring proper fit and function in their intended applications.
  5. High toughness and ductility: The steel's low-temperature impact toughness and ductility make it resistant to brittle fracture during operation.

In summary, 10Cr9Mo1VNbN high-pressure seamless boiler tubes have excellent high-temperature properties, including strength and creep resistance. They also offer good resistance to corrosion and erosion, good thermal conductivity and thermal shock resistance, precise dimensions and tolerances, and high toughness and ductility. These features make 10Cr9Mo1VNbN high-pressure seamless boiler tubes an ideal choice for various critical applications in power plant boilers.

Standard Standard

GB 5310 is a standard for seamless tubes used in high-pressure steam boilers and pipelines. The main application for GB 5310 tubes is as high-pressure pipeline tubes in boiler projects. These tubes can be used for superheaters, reheaters, and windpipes.

The GB 5310 standard applies to tubes made from materials such as:

The long-term use temperature for GB 5310 20G seamless steel pipes used as headers and steam pipes is ≤ 425 ° C.

Chemical Compositions(%) of GB 5310

Steel Grade C Si Mn S P Cr Mo V Ti B W Ni Al Nb N
20G 0.17-0.23 0.17-0.37 0.35-0.65 0.015 0.025 　 　 　 　 　 　 　 　 　 　
20 MnG 0.17-0.24 0.17-0.37 0.70-1.00 0.015 0.025 　 　 　 　 　 　 　 　 　 　
25MnG 0.22-0.27 0.17-0.37 0.70-1.00 0.015 0.025 　 　 　 　 　 　 　 　 　 　
15MoG 0.12-0.20 0.17-0.37 0.40-0.80 0.015 0.025 　 0.25-0.35 　 　 　 　 　 　 　 　
20MnG 0.15-0.25 0.17-0.37 0.40-0.80 0.015 0.025 　 0.44-0.65 　 　 　 　 　 　 　 　
12CrMoG 0.08-0.15 0.17-0.37 0.40-0.70 0.015 0.025 0.40-0.70 0.40-0.55 　 　 　 　 　 　 　 　
15CrMoG 0.12-0.18 0.17-0.37 0.40-0.70 0.015 0.025 0.80-1.10 0.40-0.55 　 　 　 　 　 　 　 　
12Cr2MoG 0.08-0.15 ≤0.60 0.40-0.60 0.015 0.025 2.00-2.50 0.90-1.13 　 　 　 　 　 　 　 　
12Cr1MoVG 0.08-0.15 0.17-0.37 0.40-0.70 0.010 0.025 0.90-1.20 0.25-0.35 0.15-0.30 　 　 　 　 　 　 　
12Cr2MoWVTiB 0.08-0.15 0.45-0.75 0.45-0.65 0.015 0.025 1.60-2.10 0.50-0.65 0.28-0.42 0.08-0.18 0.002-0.008 0.30-0.55 　 　 　 　
10Cr9Mo1VNbN 0.08-0.12 0.20-0.50 0.30-0.60 0.010 0.020 8.00-9.50 0.85-1.05 0.18-0.25 　 　 　 ≤0.040 ≤0.040 0.06-0.10 0.03-0.07

Manufacturing methods

Steel smelting method

High-quality carbon structural steel and alloy structural steel shall be smelted by electric furnace plus furnace refining, oxygen converter plus furnace refining or electroslag remelting method, and steel refined outside the furnace shall be subjected to vacuum degassing treatment.

10Cr9Mo1VNbN, 10Cr9MoW2VNbBN, 10Cr11MoW2VNbCu1BN, 11Cr9Mo1W1VNbBN and stainless (heat-resistant) steel should be smelted by electric furnace plus furnace refining or electroslag remelting. The steel refined outside the furnace should be vacuum degassed.

After consultation between the supplier and the buyer, and indicating in the contract, other higher-required smelting methods may be adopted. When the purchaser specifies a certain smelting method, it should be indicated in the contract.

Manufacturing methods and requirements for tube blanks

The tube blank can be produced by continuous casting, die casting or hot rolling (forging).

Continuous casting tube blanks shall comply with the provisions of YB/T 4149, in which the level of low-fold structural defects shall not exceed 1; the hot-rolled (forged) tube blanks shall comply with the provisions of YB/T ××××; It is carried out in accordance with the regulations for hot-rolled (forged) tube blanks.

Manufacturing method of steel pipe

Steel pipes shall be manufactured by hot rolling (extrusion, expansion) or cold drawing (rolling). Steel pipes of grade 08Cr18Ni11NbFG shall be manufactured by cold drawing (rolling) seamless method.

Delivery status

The steel pipe shall be delivered in a heat treated condition. The heat treatment system for steel pipes shall comply with the requirements of Table 4. The heat treatment system for steel pipes should be filled in the quality certificate.

Heat treatment system for steel pipes

No. Steel Pipe Heat treatment
1 12Ga、20Ga 880 ℃～940 ℃,Normalizing
2 20MnGa、25MnGa 880 ℃～940 ℃,Normalizing
3 15MoGa、20MoGa 890 ℃～950 ℃,Normalizing
4 12CrMoGa 900 ℃～960 ℃,Normalizing；650 ℃～730 ℃,Tempering
5 15CrMoGa 900 ℃～960 ℃,Normalizing；660 ℃～730 ℃,Tempering
6 12Cr2MoGa 900 ℃～960 ℃,Normalizing；700 ℃～750 ℃,Tempering
It can also be heated to 900 °C ~ 960 °C, and the furnace is cooled to 700 °C for more than 1 h, and air-cooled.
7 12Cr1MoVGa 980 ℃～1 020 ℃,Normalizing，980 °C ~ 1 020 °C normalizing, when the wall thickness is greater than 30 mm, forced cooling; 720 °C ~ 760 °C tempering.
8 12Cr2MoWVTiB 1 000 ℃～1 035 ℃,Normalizing；760 ℃～790 ℃,Tempering
9 07Cr2MoW2VNbB ≥1 040 ℃,Normalizing，≥730 ℃,Tempering
10 08Cr2Mo1W2VTiB ≥980 ℃,Normalizing，≥730 ℃,Tempering
11 12Cr3MoVSiTiB 1 040 ℃～1 060 ℃,Normalizing；720 ℃～770 ℃,Tempering
12 09Ni1MnMoNbCu 880 ℃～980 ℃,Normalizing，580 ℃～680 ℃,Tempering
13 10Cr9Mo1VNbN ≥1 040 ℃,Normalizing，≥730 ℃,Tempering
14 10Cr9MoW2VNbBN ≥1 040 ℃,Normalizing，≥730 ℃,Tempering
15 10Cr11MoW2VNbCu1BN ≥1 040 ℃,Normalizing，≥730 ℃,Tempering
16 11Cr9Mo1W1VNbBN 1 040 ℃～1 080 ℃,Normalizing，740 ℃～780 ℃,Tempering
17 15Cr18Ni9b Solution treatment: solution temperature ≥1 040 °C.
18 10Cr18Ni9NbCu3BNb Solution treatment: solution temperature ≥ 1 100 °C.
19 07Cr25Ni21NbNcd Separate solution treatment: solution temperature ≥ 1 100 °C.
20 08Cr18Ni11Nbbd Solution treatment: solution temperature ≥1 040 °C.
21 07Cr18Ni11Nbcd Separate solution treatment: hot rolling (extrusion, expansion) steel tube solid solution temperature ≥ 1 050 °C, cold drawn (rolled) steel tube solid solution temperature ≥ 1100 °C.
22 08Cr18Ni10NbFG Softening heat treatment before cold working: softening heat treatment temperature should be at least 50 °C higher than solution heat treatment temperature; solution treatment after final cold working: solution temperature ≥1 180 °C
a. The finishing temperature of the hot-rolled steel pipe is at the critical temperature of the phase transition Ar3 to the upper limit of the temperature specified in the table, and when the steel pipe is air-cooled, the steel pipe is considered to be normalized.

b. The finishing temperature of the hot-rolled steel pipe meets the solid solution temperature specified in the table. As an alternative to the solid solution treatment method, the steel pipe can be separately quenched by water or cooled by other fast enough methods.

c, the solution treatment should be a separate heat treatment, and the heat treatment in the process is not allowed to replace the separate solution treatment.

d. According to the requirements of the purchaser, the steel pipes of the grades 07Cr25Ni21NbN, 08Cr19Ni10Nb and 07Cr18Ni11Nb may be subjected to a stabilization heat treatment lower than the initial solution treatment temperature after the solution treatment, and the temperature of the stabilization heat treatment is negotiated between the supplier and the purchaser.

Mechanical Properties of GB5310

Grade Tensile strength
(Mpa)		 Yield point(Mpa)
not less than		 Elongation(%)
not less than		 Impact(J)
not less than
20G 410-550 245 24/22 40/27
25MnG 485-640 275 20/18 40/27
15MoG 450-600 270 22/20 40/27
20MnG 415-665 220 22/20 40/27
12CrMoG 410-560 205 21/19 40/27
12Cr2MoG 450-600 280 22/20 40/27
12Cr1MoVG 470-640 255 21/19 40/27
12Cr2MoWVTiB 540-735 345 18 40/27
10Cr9Mo1VNb ≥585 415 20 40
1Cr18Ni9 ≥520 206 35 　
1Cr19Ni11Nb ≥520 206 35 　

Additional Condition

  • UT(Ultrasonic examination),
  • AR(As Hot Rolled only)
  • TMCP(Thermal Mechanical Control Processing)
  • N(Normalized)
  • Q+T(Quenched and Tempered)
  • Z Direction Test(Z15,Z25,Z35)
  • Charpy V-Notch Impact Test
  • The Third Party Test (such as SGS Test)
  • Coated or Shot Blasting and Painting.

GB 5310 High pressure boiler tube Application

  • GB5310 20G seamless steel pipes are mainly used for pressure vessels, machinery, pipe fittings, oil and chemical industry.
  • GB 5310 High pressure boiler tube Other Name
  • GB 5310 High pressure boiler tube, 20G boiler steel pipe, 20G boiler pipe

Boiler tubing is used in these industries:

  • Steam Boilers
  • Power Generation
  • Fossil Fuel Plants
  • Electric Power Plants
  • Industrial Processing Plants
  • Cogeneration Facilities
Standard Standard

GB Steel Pipe Execution Standards

GB seamless steel pipes are widely produced in China, available in various sizes, grades and surface finishes to meet specific project requirements.

According to industry statistics, there are more than 240 national standard steel pipe manufacturers and 250 seamless steel pipe production lines in China.

GB steel pipe standard logo

Major GB Standards for Seamless Steel Pipes

Structural & Fluid Service
  • GB/T 8162 – Seamless steel pipe for structures
  • GB/T 8163 – Seamless steel pipe for fluid conveyance
  • GB/T 14975 – Stainless steel seamless pipe for structures
  • GB/T 14976 – Stainless steel seamless pipe for fluid service
Boiler, Pressure & Fertilizer Service
  • GB 3087 – Low & medium pressure boiler tubes
  • GB 5310 – High-pressure boiler tubes
  • GB 5312 – Marine boiler & superheater tubes
  • GB 1479 – High-pressure fertilizer equipment tubes
  • GB 9948 – Petroleum cracking tubes
  • GB 13296 – Stainless steel tubes for boilers & heat exchangers
Mechanical & Hydraulic Applications
  • GB/T 3639 – Cold drawn precision seamless tubes
  • GB/T 3094 – Cold drawn special-shaped seamless tubes
  • GB/T 8713 – Precision ID tubes for hydraulic & pneumatic cylinders
  • GB/T 17396 – Hot-rolled seamless tubes for hydraulic props
  • GB 3093 – High-pressure diesel engine fuel tubes
Special Applications
  • GB 18248 – Seamless steel pipe for gas cylinders
  • YB/T 5035 – Seamless pipe for automotive axle housings

Chemical Composition (%) of Major GB Steel Grades

Grade C Si Mn Cr Ni Mo P ≤ S ≤ Ti Cu ≤
Q195 0.06–0.12 ≤0.30 0.25–0.50 ≤0.3 ≤0.3 – 0.045 0.050 – 0.30
Q235 0.14–0.22 ≤0.30 0.30–0.65 ≤0.3 ≤0.3 – 0.045 0.050 – 0.30
Q345B ≤0.20 ≤0.55 1.00–1.60 – – – 0.040 0.040 – –
10# 0.07–0.13 0.07–0.37 0.35–0.65 ≤0.15 ≤0.3 – 0.035 0.035 – 0.25
20# 0.17–0.23 0.07–0.37 0.35–0.65 ≤0.25 ≤0.3 – 0.035 0.035 – 0.25
35# 0.32–0.39 0.07–0.37 0.50–0.80 ≤0.25 ≤0.3 – 0.035 0.035 – 0.25
45# 0.42–0.50 0.07–0.37 0.50–0.80 ≤0.25 ≤0.3 – 0.035 0.035 – 0.25
20Cr 0.18–0.24 0.07–0.37 0.50–0.80 0.70–1.00 ≤0.3 – 0.035 0.035 – 0.30
40Cr 0.37–0.44 0.07–0.37 0.50–0.80 0.80–1.10 ≤0.3 – 0.035 0.035 – 0.30
20CrMo 0.17–0.24 0.07–0.37 0.40–0.70 0.80–1.10 ≤0.3 0.15–0.25 0.035 0.035 – 0.30
35CrMo 0.32–0.40 0.07–0.37 0.40–0.70 0.80–1.10 ≤0.3 0.15–0.25 0.035 0.035 – 0.30
42CrMo 0.38–0.45 0.07–0.37 0.50–0.80 0.90–1.20 1.00–1.40 0.15–0.25 0.035 0.035 – 0.30
20CrMoTi 0.17–0.23 0.07–0.37 0.40–0.70 0.45–0.75 ≤0.3 – 0.035 0.035 – 0.30
35Mn2 0.32–0.39 0.07–0.37 1.40–1.80 ≤0.3 ≤0.3 – 0.035 0.035 – 0.30
40Mn2 0.37–0.44 0.07–0.37 1.40–1.80 ≤0.3 ≤0.3 – 0.035 0.035 – 0.30
35SiMn 0.32–0.40 1.10–1.40 1.10–1.40 ≤0.3 ≤0.3 – 0.035 0.035 – 0.30
15Mn 0.12–0.16 0.07–0.37 0.70–1.00 ≤0.25 ≤0.3 – 0.035 0.035 – 0.25
20Mn 0.17–0.23 0.07–0.37 0.70–1.00 ≤0.25 ≤0.3 – 0.035 0.035 – 0.25

Outer Diameter Tolerances

Class Tolerance
D1 ±1.5%，min ±0.75 mm
D2 ±1.0%，min ±0.50 mm
D3 ±0.75%，min ±0.30 mm
D4 ±0.50%，min ±0.10 mm
Cutting steel tube

Seamless Tube Processing

With years of expertise, we provide a wide range of steel tube processing services. From basic sawing and machining to complex bending and upsetting operations, we support you at every stage of your project.

Our capabilities include eccentricity reduction and concentricity improvement through turning and grinding. We specialize in creating complex geometries using rotary swaging and axial forming, and offer property modifications through partial heat treatment to meet your exact requirements.

Our Processing Capabilities

Variable wall thicknesses
Drilling / Stamping / Lasering
Peeling / Roller Burnishing
Cold Forming
Cutting
Beveling
Deburring
Thread Rolling / Threading
Partial Hardening
Turning / Milling / Grinding
Reducing / Expanding
Swing

Our Areas of Application

A range to meet your needs

Mechanical engineering

Mechanical engineering

High-quality steel solutions for diverse mechanical engineering applications – reliable, precise, and built for performance.

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Construction

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Automotive

Versatile components for the automotive industry – precision, quality, and processing expertise for every application.

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Plant Engineering & Energy

Plant Engineering & Energy

Robust tubes for plant engineering and energy systems – designed for extreme conditions and long-term efficiency.

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Infrastructure

Versatile solutions for modern infrastructure – supporting reliable supply networks and large-scale construction projects.

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Hydraulics

Hydraulics

Versatile solutions for hydraulic systems – durable, pressure-resistant, and engineered for maximum reliability.

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Typical Applications

  • Power generation & thermal plants
  • Boilers, superheaters, reheaters
  • Steam piping & headers
  • Heat exchangers & condensers
  • Oil & gas processing
  • Petrochemical & refining
  • Fertilizer & chemical plants
  • Nuclear power facilities

Key Advantages

  • High-temperature strength
  • Excellent pressure resistance
  • Superior corrosion & oxidation resistance
  • Long service life
  • Reduced maintenance cost
  • Good weldability & recyclability

Service Conditions

Condition Typical Application
High Temperature Boilers, superheaters, steam headers
Low Temperature Cryogenic processing systems
High Pressure Power & process piping
Corrosive Media Chemical & petrochemical plants
Creep Service Thermal power stations

Common Standards

Product Specification
Seamless Pipes ASTM A335 P1 / P5 / P9 / P11 / P22 / P91
Butt Weld Fittings ASTM A234 WP1 / WP5 / WP9 / WP11 / WP22 / WP91
Forged Fittings & Flanges ASTM A182 F1 / F5 / F9 / F11 / F22 / F91

Industries Served

Sunny Steel supplies alloy steel piping systems worldwide, supporting projects that demand certified materials, full traceability and long-term operational reliability.

  • Oil & Gas
  • Petrochemical
  • Power Generation
  • Chemical Processing
  • Mining
  • Marine Engineering
  • Refineries
  • Fertilizer Plants
  • Heavy Industry

Inspection

Chemical composition inspection, mechanical properties test(tensile strength,yield strength, elongation, flaring, flattening, bending, hardness, impact test), surface and dimension test, non-destructive test, hydrostatic test.

PMI

Identification of the chemical composition of the metal used to manufacture the fitting. Uses PMI sensors, including X-ray fluorescence or optical emission spectrometry.

PMI metal composition inspection
PMI metal composition inspection
PMI metal composition inspection
PMI metal composition inspection
PMI metal composition inspection
PMI metal composition inspection

Size measurement

Steel pipe length measurement
Steel pipe outer diameter measurement
Steel pipe wall thickness measurement
Seamless tube wall thickness measurement
Seamless tube outer diameter measurement

Seamless pipes with compound bevels as per ASME B16.25 And ASTM A333

ASTM A333 Grade 8 cryogenic seamless pipe compound bevel
ASTM A333 Grade 8 cryogenic seamless pipe compound bevel
ASTM A333 Grade 8 cryogenic seamless pipe compound bevel
ASTM A333 Grade 8 cryogenic seamless pipe compound bevel
ASTM A333 Grade 8 cryogenic seamless pipe compound bevel
ASTM A333 Grade 8 cryogenic seamless pipe compound bevel
ASTM A333 Grade 8 cryogenic seamless pipe compound bevel
ASTM A333 Grade 8 cryogenic seamless pipe compound bevel
ASTM A333 Grade 8 cryogenic seamless pipe compound bevel

Delivery

Steel pipe delivery status(condition)

Steel pipe delivery status(condition): cold / hard (BK), cold / soft (BKW), after cold stress relief annealing (BKS), annealing (GBK), normalized (NBK).

Condition on delivery of steel pipe

Term Symbol Explanation
Cold-finished/hard (cold-finished as-drawn) BK No heat treatment after the last cold-forming process. The tubes therefore have only low deformability.
Cold-finished/soft (lightly cold-worked) BKW After the last heat treatment there is a light finishing pass (cold drawing). With proper subsequent processing, the tube can be cold-formed (e.g. bent, expanded) within certain limits.
Annealed GBK After the final cold-forming process the tubes are annealed in a controlled atmosphere or under vacuum.
Normalized NBK The tubes are annealed above the upper transformation point in a controlled atmosphere or under vacuum.

The general cold strip mills, volume should go through continuous annealing (CAPL unit) to eliminate cold hardening and rolling stress, or batch annealing reach the mechanical properties of the corresponding standard specifies. Cold rolled steel surface quality, appearance, dimensional accuracy better than hot-rolled plate, and right-rolled thin product thickness is about 0.18mm, so the majority of users favor.

Cold rolled steel coil substrate products deep processing of high value-added products. Such as electro-galvanized, hot dip galvanized, electro-galvanized fingerprint resistant, painted steel roll damping composite steel, PVC laminating steel plates, etc., so that the excellent quality of these products has a beautiful, high resistance to corrosion, has been widely used.

Cold rolled steel coil finishing after annealing, cut the head, tail, trimming, flattening, smooth, heavy volume, or longitudinal clipboard. Cold-rolled products are widely used in automobile manufacturing, household electrical appliances, instruments, switches, buildings, office furniture and other industries. Steel plate strapping package weight of 3 to 5 tons. Flat sub-volume typically 3 to 10 tons / volume. Coil diameter 6m.

Packing

Bare packing/bundle packing/crate packing/wooden protection at the both sides of tubes and suitably protected for seaworthy delivery or as requested.

Steel pipe bundle packing
Steel pipe bundle packing
Seamless steel pipe packing
Seamless steel pipe packing
Small diameter tube packing
Small diameter tube packing

Placing steel pipes into containers

Alloy pipe loading into container
Alloy pipe loading into container
Alloy pipe loading into container
Alloy pipe loading into container
Alloy pipe loading into container
Alloy pipe loading into container

There are probably hundreds of different methods for packing a pipe, and most of them have merit, but there are two principles that are vital for any method to work: prevent rusting and sea transportation security.

Steel strips bundling for fixed pipes

  • Plastic caps plugged at the two sides of pipe ends
  • Avoid damage caused by steel strapping during transportation
  • Bundled signs should be uniform and consistent
  • The same bundle(batch) of steel pipe shall come from the same furnace.
  • The steel pipe shall have the same furnace number, steel grade and specifications.

Our packing can meet any needs of the customers.

Frequently Asked Questions
Alloy steels are made by combining carbon steel with one or several alloying elements, such as manganese, silicon, nickel, titanium, copper, chromium and aluminum. These metals are added to produce specific properties that are not found in regular carbon steel. The elements are added in varying proportions (or combinations) making the material take on different aspects such as increased hardness, increased corrosion resistance, increased strength, improved formability (ductility); the weldability can also change.

  • Increased hardenability.

  • Increased corrosion resistance.

  • Retention of hardness and strength.

  • Nearly all alloy steels require heat treatment in order to bring out their best properties.

Alloying elements are added to steel to enhance mechanical properties, wear resistance, corrosion resistance, and high-temperature performance.

  • Chromium – Adds hardness. Increased toughness and wear resistance.

  • Cobalt – Used in making cutting tools; improved Hot Hardness (or Red Hardness).

  • Manganese – Increases surface hardness. Improves resistance to strain, hammering & shocks.

  • Molybdenum – Increases strength. Improves resistance to shock and heat.

  • Nickel – Increases strength & toughness. Improves corrosion resistance.

  • Tungsten – Adds hardness and improves grain structure. Provides improved heat resistance.

  • Vanadium – Increases strength, toughness and shock resistance. Improved corrosion resistance.

  • Chromium-Vanadium – Greatly improved tensile strength. It is hard but easy to bend and cut.


  • API 5L – Line Pipe

  • ASTM A 53 – Black and Hot-Dipped, Zinc-Coated, Welded and Seamless, Steel Pipe

  • ASTM A 106 – Seamless Carbon Steel Pipe for High-Temperature Service

  • ASTM A 213 – Seamless Ferritic and Austenitic Alloy-Steel Boiler, Superheater, and Heat-Exchanger Tubes

  • ASTM A 269 – Seamless and Welded Austenitic Stainless Steel Tubing for General Service

  • ASTM A 312 – Seamless, Welded, and Heavily Cold Worked Austenitic Stainless Steel Pipes

  • ASTM A 333 – Seamless and Welded Steel Pipe for Low-Temperature Service

  • ASTM A 335 – Seamless Ferritic Alloy-Steel Pipe for High-Temperature Service

  • ASTM A 358 – Electric-Fusion-Welded Austenitic Chromium-Nickel Stainless Steel Pipe for High-Temperature Service and General Applications

  • ASTM A 671 – Electric-Fusion-Welded Steel Pipe for Atmospheric and Lower Temperatures

  • ASTM A 672 – Electric-Fusion-Welded Steel Pipe for High-Pressure Service at Moderate Temperatures

  • ASTM A 790 – Seamless and Welded Ferritic/Austenitic Stainless Steel Pipe

  • ASTM A 928 – Ferritic/Austenitic (Duplex) Stainless Steel Pipe Electric Fusion Welded with Addition of Filler Metal

  • EN 10208-2 – Steel pipes for pipelines for combustible fluids – Part 2: Pipes of requirement class B

  • EN 10210-1/2 – Hot finished structural hollow sections of non-alloy and fine grain steels

  • EN 10216-1 – Seamless steel tubes for pressure purposes – Part 1: Non-alloy steel tubes with specified room temperature properties

  • EN 10216-2 – Seamless steel tubes for pressure purposes – Part 2: Non-alloy and alloy steel tubes with specified elevated temperature properties

  • EN 10217-1 – Welded steel tubes for pressure purposes – Part 1: Non-alloy steel tubes with specified room temperature properties

  • EN 10217-2 – Welded steel tubes for pressure purposes – Part 2: Electric welded non-alloy and alloy steel tubes with specified elevated temperature properties

  • EN 10219-1/2 – Cold formed welded structural hollow sections of non-alloy and fine grain steels

  • EN 10297-1 – Seamless circular steel tubes for mechanical and general engineering purposes – Part 1 Non-alloy and alloy steel tubes


  • API 5L Gr. A, B, X42, X52, X60, X65, X70

  • ASTM A 53 Gr. A, Gr. B

  • ASTM A106 Gr. A, B, C

  • ASTM A 213 TP 304, 304L, 304H, 316, 316L, 316H, 321, 321H, T5, T9, T11

  • ASTM A 269 TP 304, 304L, 304H, 316, 316L, 316H, 321, 321H

  • ASTM A 312 TP 304, 304L, 304H, 316, 316L, 316H, 321, 321H

  • ASTM A 333 Gr. 3, Gr. 6 ASTM A 335 P1, P2, P5, P9, P11, P12, P22, P91, P92

  • ASTM A 358 TP 304, 304L, 304H, 316, 316L, 316H, 321, 321H

  • ASTM A 671 CC 60, CC 65, CC 70

  • ASTM A 672 CC 60, CC 65, CC 70

  • ASTM 790 UNS S31803, UNS S32205, UNS S32750, UNS S32760

  • ASTM A928

  • EN 10208-2 L245, L 290, L360

  • EN 10210-1 S235 JRH, S275 JOH, S275 J2H, S355 JOH, S355 J2H

  • EN 10216-1 P235 TR1/2

  • EN 10216-2 P235 GH, P265 GH

  • EN 10217-1 P235 TR1/2, P275 TR1/2

  • EN 10217-2 P235 GH, P265 GH

  • EN 10219-1 S235 JRH, S275 JOH, S275 J2H, S355 JOH, S355 J2H

  • EN 10297-1 E235, E275, E315, E355, E470

Alloying Elements

Commonly used alloying elements and their effects are listed in the table given below.

Alloying Elements Effect on the Properties
Chromium Increases Resistance to corrosion and oxidation. Increases hardenability and wear resistance. Increases high temperature strength.
Nickel Increases hardenability. Improves toughness. Increases impact strength at low temperatures.
Molybdenum Increases hardenability, high temperature hardness, and wear resistance. Enhances the effects of other alloying elements. Eliminate temper brittleness in steels. Increases high temperature strength.
Manganese Increases hardenability. Combines with sulfur to reduce its adverse effects.
Vanadium Increases hardenability, high temperature hardness, and wear resistance. Improves fatigue resistance.
Titanium Strongest carbide former. Added to stainless steel to prevent precipitation of chromium carbide.
Silicon Removes oxygen in steel making. Improves toughness. Increases hardness ability
Boron Increases hardenability. Produces fine grain size.
Aluminum Forms nitride in nitriding steels. Produces fine grain size in casting. Removes oxygen in steel melting.
Cobalt Increases heat and wear resistance.
Tungsten Increases hardness at elevated temperatures. Refines grain size.

GB 5310 High Pressure Boiler Tube

GB5310 Boiler Tube

GB 5310 High Pressure Seamless Steel tube

GB 9948 Seamless Steel Pipe

GB 9948

GB 9948 SEAMLESS STEEL PIPE - industrial steel pipe

GB/T18984 Low-Temperature Heat Exchanger Tubes

GB T18984

GB T18984 LOW TEMPERATURE HEAT EXCHANGER TUBES - seamless steel tube
GB 5310 20G High Pressure Boiler Tubes

20G High Pressure Boiler Tube

GB 5310 20G high pressure seamless boiler tube designed for high-pressure and high-temperature environments.

12Cr5MoI Seamless Steel Tube

12Cr5MoI Seamless Tube

12Cr5MoI Seamless Tube - seamless steel tube

09CrCuSb seamless steel pipe

09CrCuSb seamless steel pipe

09CrCuSb seamless steel pipe - industrial steel pipe

GB3087 Steel Pipe

GB3087 STEEL PIPE

GB3087 STEEL PIPE - industrial steel pipe

35crmo Seamless Steel Pipe

35CRMO Pipe

35CRMO SEAMLESS STEEL PIPE - industrial steel pipe
15CrMoG alloy pipe

15CrMoG

Chromium molybdenum alloy steel pipe designed for high-temperature and high-strength applications.

GB 6479 Seamless Steel Pipe

GB 6479

GB 6479 SEAMLESS STEEL PIPE - industrial steel pipe

15CrMo boiler tube

15CrMo boiler tube

15CrMo boiler tube - seamless steel tube

GB 8163 Steel Pipe

GB 8163 STEEL PIPE

GB 8163 STEEL PIPE - industrial steel pipe
Hot Products
Ceramic lined pipe

【H】 Ceramic lined pipe

Ceramic lined pipe is made through self-propagating high-temperature synthesis (SHS) technique.

Cast basalt lined steel pipe

【H】 Cast basalt lined steel pipe

Cast basalt lined steel pipe is composed by lined with cast basalt pipe, outside steel pipe and cement mortar filling between the two layers.

Ceramic Tile Lined Pipes

【H】 Ceramic Tile Lined Pipes

Ceramic tile lined pipes have very uniform coating of specially formulated ceramic material that is affixed to the inner of the pipe.

Rare earth alloy wear-resistant pipe

【H】 Rare earth alloy wear-resistant pipe

The material of the rare earth alloy wear-resistant pipe is ZG40CrMnMoNiSiRe, which is also the grade of rare earth alloy steel.

Tubes Erosion Shields

【H】 Tubes Erosion Shields

Tubes Erosion Shields are used to protect boiler tubing from the highly erosive effects of high temperatures and pressures thereby greatly extending tube life.

ASTM A213 T91 Seamless Alloy Tube

【H】 ASTM A213 T91 Alloy Tube

The ASTM A213 T91 seamless tubes are primarily used for boiler, superheater, and heat-exchanger.

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