GB 6479 Seamless Steel Pipe

GB 6479 Seamless Steel Pipe

GB 6479 specification covers seamless steel pipes for high-pressure fertilizer equipment and pipelines, and also for other chemical equipment.

GB 6479 is a Chinese standard that specifies the technical requirements for seamless steel tubes used in high-pressure chemical fertilizer equipment. It covers various grades of steel, including carbon structural steel and alloy steel.

The GB 6479 standard, officially known as GB 6479—2013 Seamless steel tubes for high-pressure chemical fertilizer equipments, is a national standard of the People's Republic of China that aims to regulate the production, inspection, and application of seamless steel tubes used in high-pressure fertilizer equipment. This standard was published on September 18, 2013, and was implemented on July 1, 2014, by the General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China and the Standardization Administration of China.

Scope of the Standard

The GB 6479 standard is primarily applicable to seamless steel tubes used in high-pressure fertilizer equipment and pipelines. It also applies to seamless steel tubes used in other chemical equipment. This standard ensures the safety and reliability of seamless steel tubes in high-pressure fertilizer equipment, which is of great significance to the safe production of the chemical industry.

Main Content of the Standard

The GB 6479 standard provides detailed specifications for the dimensions, shape, weight, technical requirements, testing methods, inspection rules, packaging, marking, and quality certificates of high-pressure fertilizer equipment and pipeline seamless steel tubes. These specifications provide clear technical guidance for the production and inspection of seamless steel tubes, ensuring the quality and consistency of the products.

Technical Requirements

The technical requirements of the GB 6479 standard include the chemical composition, mechanical properties, process performance, and surface quality of the steel tubes. These requirements ensure that the steel tubes can maintain long-term stable performance under the harsh working conditions of high-pressure fertilizer equipment.

Size and Tolerances

The GB 6479 standard strictly regulates the size specifications and tolerances of seamless steel tubes to ensure their applicability and interchangeability. The size specifications mainly include the outer diameter and wall thickness of the steel tubes, which determine their pressure-bearing capacity and processing adaptability.

Inspection and Acceptance

The GB 6479 standard stipulates a variety of inspection methods to ensure the quality of seamless steel tubes meets the requirements of high-pressure fertilizer equipment. These inspection methods include chemical composition analysis, mechanical property testing, non-destructive testing, and more.

Packaging, Marking, and Storage

According to the GB 6479 standard, the packaging, marking, and storage of seamless steel tubes are required to protect the quality of the tubes during transportation and storage and to provide a basis for users to identify and verify the products.

The formulation and implementation of the GB 6479 standard have a profound impact on China's chemical equipment manufacturing industry. It not only standardizes the production and inspection process of seamless steel tubes for high-pressure fertilizer equipment but also ensures the safety and reliability of chemical equipment.

Chemical Component(%) of GB6479

Grade C Si Mn Cr Mo V W Nb Ni P S(No More Than)
10 0. 07-0. 13 0. 17 -0. 37 0.35 -0. 65 - - - - - - 0.025 0.015
20 0. 17 -0. 23 0.17 -0. 37 0. 35-0.65 - - - - - - 0.025 0.015
Q345Ba 0. 12 -0. 20 0.20-0. 50 1.20-1.70 <0. 30 <0. 10 Mis - <0.07 W0. 50 0.025 0.015
Q345C" 0. 12 -0. 20 0.20 -0. 50 1.20 -1. 70 W0. 30 <0. 10 <0. 15 - W0.07 <0. 50 0.025 0.015
Q345D" 0. 12 -0. 18 0.20 -0. 50 1. 20-1.70 W0. 30 <0. 10 <0. 15 - W0.07 <0. 50 0. 025 0.015
Q345Ea*B 0. 12 -0. 18 0. 20-0. 50 1. 20 -1.70 W0. 30 <0. 10 <0. 15 - <0.07 <0. 50 0. 025 0.01
12CrMo 0. 08-0. 15 0.17 -0. 37 0. 40-0. 70 0. 40-0. 70 0. 40-0. 55 - - - - 0. 025 0.015
15CrMo 0. 12 -0. 18 0. 17 -0. 37 0. 40-0. 70 0. 80-1. 10 0. 40-0.55 - - - - 0. 025 0. 015
12Cr2Mo 0. 08-0. 15 <0. 50 0. 40-0.6 2.00-2. 50 0. 90-1. 13 - - - - 0.025 0. 015
12Cr5Mo <0. 15 <0.50 <0. 60 4. 00-6.00 0. 40-0. 60 - - - <0. 60 0. 025 0. 015
LOMoWVNb 0. 07-0. 13 0. 50-0.8 0. 50-0.8 - 0. 60-0. 90 0. 30-0. 50 0. 50-0. 90 0. 06-0. 12 - 0.025 0.015
12SiMoVNb 0.08 -0. 14 0.50 -0.8 0. 60-0. 90 - 0. 90-1. 10 0. 30-0. 50 - 0. 04-0.08 - 0.025 0.015

Awhen It Is Necessary To Add Fine Grain Elements, The Steel Shall Contain At Least One Of Al, Nb, V And Ti. The Added Fine Grain Elements Shall Be Indicated In The Quality Certificate. Ti Content Shall Not Be More Than 0.20%

BAl Content In Steel Shall Not Be Less Than 0.020%, Or Ala Content In Steel Shall Not Be Less Than 0.015%

Mechanical Properties of GB6479

Grade Tensile (MPa) Yield (MPa) Elong After Fracture A/% Reduction Of Area (Z/%) Shork Absorption Energy
（KV2）/J
Steel Tube Wall Thickness/Mm Test Temperature/℃ Portrait Transver
W16 >16 — 40 >40 Portrait Transver
Not Less Than Not Less Than
10 335-490 205 195 185 24 22 一 一 — 一
20 410-550 245 235 225 24 22 一 0 40 27
Q345B 490-670 345 335 325 21 19 一 20 40 27
Q345C 490-670 345 335 325 21 19 一 0 40 27
Q345D 490-670 345 335 325 21 19 一 -20 40 27
Q345E 490-670 345 335 325 21 19 — -40 40 27
12CrMo 410-560 205 195 185 21 19 — 20 40 27
15CrMo 440-640 295 285 275 21 19 一 20 40 27
12Cr2Moa 450-600 280 20 18 一 20 40 27
12Cr5Mo 390-590 195 185 175 22 20 一 20 40 27
LOMoWVNb 470-670 295 285 275 19 17 一 20 40 27
12SiMoVNb 2470 315 305 295 19 17 50 20 40 27

Additional Condition

Application:

GB6479 steel pipe is mainly used for high-pressure fertilizer equipment and seamless steel pipe for pipelines.

Executive standard: GB6479-2013
Product Name: Seamless steel pipe for high pressure fertilizer
Steel grade:10, 20, Q345B/C/D/E, 12CrMo, 15CrMo, 12Cr2Mo, 12Cr5Mo, 10MoWVNb, 12SiMoVNb, etc.

Standard Standard
GB steel pipe

GB Steel pipe execution standard

GB seamless steel pipes are available from various manufacturers and suppliers in China. They come in different sizes, grades, and surface finishes to meet specific project requirements.

According to incomplete statistics, there are more than 240 national standard steel pipe production enterprises and more than 250 seamless steel pipe units.

  1. GB/T8162-1999 (Seamless steel pipe for structure). Mainly used for general structure and mechanical structure. Its representative material (brand): carbon steel 20, 45 steel; alloy steel Q345, 20Cr, 40Cr, 20CrMo, 30-35CrMo, 42CrMo, etc.
  2. GB/T8163-1999 (Seamless steel pipe for fluid conveying). Mainly used in engineering and large equipment to transport fluid pipelines. The representative material (brand) is 20, Q345, etc.
  3. GB3087-1999 (Seamless steel pipes for low and medium pressure boilers). Mainly used in industrial boilers and domestic boilers to transport low and medium pressure fluid pipelines. Representative materials are 10 and 20 steel.
  4. GB5310-1995 (Seamless steel pipes for high-pressure boilers). Mainly used for high temperature and high pressure transmission fluid headers and pipelines in power stations and nuclear power plants Representative materials are 20G, 12Cr1MoVG, 15CrMoG, etc.
  5. GB5312-1999 (Carbon steel and carbon manganese steel seamless steel pipe for ships). Mainly used for I and II pressure pipes for marine boilers and superheaters. Representative materials are 360, 410, 460 steel grades, etc.
  6. GB1479-2000 (Seamless steel tubes for high-pressure fertilizer equipment). Mainly used for conveying high temperature and high pressure fluid pipelines on fertilizer equipment. Representative materials are 20, 16Mn, 12CrMo, 12Cr2Mo, etc.
  7. GB9948-1988 (Seamless steel pipe for petroleum cracking). Mainly used in boilers, heat exchangers and fluid pipelines of petroleum smelters. Its representative materials are 20, 12CrMo, 1Cr5Mo, 1Cr19Ni11Nb, etc.
  8. GB18248-2000 (Seamless steel pipe for gas cylinders). Mainly used to make various gas and hydraulic cylinders. Its representative materials are 37Mn, 34Mn2V, 35CrMo, etc.
  9. GB/T17396-1998 (Hot-rolled seamless steel pipe for hydraulic props). Mainly used to make coal mine hydraulic supports, cylinders and columns, and other hydraulic cylinders and columns. Its representative materials are 20, 45, 27SiMn, etc.
  10. GB3093-1986 (High-pressure seamless steel pipe for diesel engine). Mainly used for high pressure oil pipe of diesel engine injection system. The steel pipe is generally cold drawn, and its representative material is 20A.
  11. GB/T3639-1983 (Cold drawn or cold rolled precision seamless steel tube). It is mainly used for steel pipes for mechanical structures and carbon pressure equipment, requiring high dimensional accuracy and good surface finish. Its representative materials are 20, 45 steel, etc.
  12. GB/T3094-1986 (Cold drawn seamless steel pipe special-shaped steel pipe). It is mainly used to make various structural parts and parts, and its materials are high-quality carbon structural steel and low-alloy structural steel.
  13. GB/T8713-1988 (Precision inner diameter seamless steel pipe for hydraulic and pneumatic cylinders). It is mainly used to make cold-drawn or cold-rolled seamless steel pipes with precise inner diameters for hydraulic and pneumatic cylinders. Its representative materials are 20, 45 steel, etc.
  14. GB3093-1986 (High-pressure seamless steel pipes for diesel engines). Mainly used for high pressure oil pipe of diesel engine injection system. The steel pipe is generally cold drawn, and its representative material is 20A.
  15. GB/T3639-1983 (Cold drawn or cold rolled precision seamless steel tube). It is mainly used for steel pipes for mechanical structures and carbon pressure equipment, requiring high dimensional accuracy and good surface finish. Its representative materials are 20, 45 steel, etc.
  16. GB/T3094-1986 (Cold drawn seamless steel pipe special-shaped steel pipe). It is mainly used to make various structural parts and parts, and its materials are high-quality carbon structural steel and low-alloy structural steel.
  17. GB/T8713-1988 (Precision inner diameter seamless steel pipe for hydraulic and pneumatic cylinders). It is mainly used to make cold-drawn or cold-rolled seamless steel pipes with precise inner diameters for hydraulic and pneumatic cylinders. Its representative materials are 20, 45 steel, etc.
  18. GB13296-1991 (Stainless steel seamless steel tubes for boilers and heat exchangers). Mainly used in boilers, superheaters, heat exchangers, condensers, catalytic tubes, etc. of chemical enterprises. Used high temperature, high pressure, corrosion resistant steel pipe. Its representative materials are 0Cr18Ni9, 1Cr18Ni9Ti, 0Cr18Ni12Mo2Ti, etc.
  19. GB/T14975-1994 (Stainless steel seamless steel pipe for structure). It is mainly used for general structure (hotel and restaurant decoration) and mechanical structure of chemical enterprises, which are resistant to atmospheric and acid corrosion and have certain strength. Its representative materials are 0-3Cr13, 0Cr18Ni9, 1Cr18Ni9Ti, 0Cr18Ni12Mo2Ti, etc.
  20. GB/T14976-1994 (Stainless steel seamless steel pipe for fluid transportation). Mainly used for pipelines that transport corrosive media. Representative materials are 0Cr13, 0Cr18Ni9, 1Cr18Ni9Ti, 0Cr17Ni12Mo2, 0Cr18Ni12Mo2Ti, etc.
  21. YB/T5035-1993 (Seamless steel pipe for automobile axle casing). It is mainly used to make high-quality carbon structural steel and alloy structural steel hot-rolled seamless steel pipes for automobile half-axle sleeves and drive axle axle tubes. Its representative materials are 45, 45Mn2, 40Cr, 20CrNi3A, etc.

Chemistry constitute table of main product steel grade

Steel Grade Chemistry Constitute
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
30CrMo 0.26-0.34 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

GB steel pipe size and tolerance

Deviation level Standardized outer diameter 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

What is a seamless pipe used for?

Seamless steel pipe is regularly used in the transportation of fluids such as water, natural gas, waste and air. It is also regularly required in many high-pressure, high-corrosive environments such as in the oil & gas, power generation and pharmaceutical industries. Some common uses of seamless pipes include:


Fluid Tubes

Fluid Tubes

Fluid Tubes - seamless steel tube

Steel Pipe For Gas Cylinder

Steel Pipe For Gas Cylinder

Steel Pipe For Gas Cylinder - industrial steel pipe

Seamless Boiler Tubes

Boiler Tubes

High strength seamless boiler pipes in carbon, alloy and stainless steel, compliant with GB5310, ASME SA213, SA335, DIN17175 etc.


Heat Exchanger Tubes

Heat Exchanger Tubes

Heat Exchanger Tubes - seamless steel tube

Seamless Pipes And Tubes For Pressure Applications

Tubes For Pressure

Tubes For Pressure - industrial steel pipe

Ship Building Tubes

Ship Building Tubes

Ship Building Tubes - seamless steel tube

Seamless Pipe For Nuclear Power Station

Nuclear Power Station pipe

Nuclear Power Station pipe - industrial steel pipe

Pipe For Chemical Equipment

Pipe For Chemical Equipment

Pipe For Chemical Equipment - industrial steel pipe

Seamless drill pipe

Seamless drill pipe

Seamless drill pipe - industrial steel pipe

Honed Tube

Honed Tube

Honed Tube - seamless steel tube

Pipe For Cryogenic Device

Pipe For Cryogenic Device

Pipe For Cryogenic Device - industrial steel pipe

Tubes For Mechanical And Automobile

Mechanical& Automobile Tubes

Mechanical& Automobile Tubes - seamless steel tube

Bearing Pipes

Bearing Pipes

Bearing Pipes - industrial steel pipe

Other Structural Pipe

Other Structural Pipe

Other Structural Pipe - industrial steel pipe

Line Pipes Used In Sour Service Environment

Sour Service Environment pipe

Sour Service Environment pipe - industrial steel pipe

Seamless Pipes For Low And Medium Pressure Service

Low And Medium Pressure pipes

Low And Medium Pressure pipes - industrial steel pipe

Waterwall tubes

Waterwall tubes

Waterwall tubes - seamless steel tube

Low-Temperature Service Pipe

Low-Temperature Service Pipe

Low-Temperature Service Pipe - industrial steel pipe

Marine Seamless Steel Pipe

Marine Seamless Steel Pipe

Marine Seamless Steel Pipe - industrial steel pipe

Mechanical Tubes

Mechanical Tubes

Mechanical Tubes - seamless steel tube

Seamless Pipe For Structure

Structure Pipe

Structure Pipe - industrial steel pipe

Seamless Pipes For High Temperature

Seamless Pipes For High Temperature

Seamless Pipes For High Temperature - industrial steel pipe

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.

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15CrMoG

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

GB/T18984 Low-Temperature Heat Exchanger Tubes

GB T18984 LOW TEMPERATURE HEAT EXCHANGER TUBES

GB T18984 LOW TEMPERATURE HEAT EXCHANGER TUBES - seamless steel tube

12Cr5MoI Seamless Steel Tube

12Cr5MoI Seamless Tube

12Cr5MoI Seamless Tube - seamless steel tube

15CrMo boiler tube

15CrMo boiler tube

15CrMo boiler tube - seamless steel tube

35crmo Seamless Steel Pipe

35CRMO SEAMLESS STEEL PIPE

35CRMO SEAMLESS 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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When you partner with Sunny Steel, you can stop worrying about meeting deadlines thanks to our responsive and timely service. You'll also say goodbye to unnecessary shopping around. Instead, you'll get white glove service from an expert who understands your needs and can get you the materials you need quickly.

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Materials delivered on-time and at a fair price

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No delays in production or manufacturing process

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Meet engineering specifications to ensure top quality

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