Structural seamless pipes

With its enhanced cross-sectional efficiency, it makes a major contribution to lightweight, economic structural design. In addition, its attractive round appearance facilitates elegant and beautiful structures.

Structural seamless pipes
Standard:
Steel pipe application in structure engineering
Steel Pipe for General Structures

Application:
for the manufacture of pipelines, containers, equipment, fittings and mechanical structures .

Steel grad:
10、20、35、45、Q345、15CrMo、12Cr1MoV、A53A、A53B、SA53A、SA53B

Types of Steel Pipe for Machine Structures
Product name Manufacturing method Main features and applications
Carbon Steel Pipe for Machine Structures These products normally conform to JIS G 3445 Carbon Steel Tubes for Machine Structural Purposes. 
We also manufacture such carbon steel pipe products using materials that conform to JIS G 4051 Steel for Machine Structural Purposes, as well as to other standards and specifications.
These steel pipe products are used in machines, automobiles, bicycles, furniture, tools and utensils, and other machine parts.
Alloy Steel Pipe for Machine Structures These products normally conform to JIS G 3441 Alloy Steel Tubes for Machine Structure Purposes, but we also manufacture such alloy steel pipe products using materials that conform to JIS G 4053 Low-Alloyed Steels for Machine Structural Use, as well as to other standards and specifications. These steel pipe products are used in machines, automobiles, and other machine parts.
ERW Carbon Steel Pipe for Machine Structures These products are manufactured based on JIS G 3472 Electric Resistance Welded Carbon Steel Tubes for Automobile Structural Purposes. They are used mainly in automotive machine parts.
High-Strength Steel Pipe for Machine Structures These steel pipe products, include seamless steel pipe, ERW steel pipe, and hot finished ERW steel pipe. They are used in marine structures and cylinders for their excellent weldability and low-temperature properties, and in machine parts for reduced weight and increased strength.

Type Signal Tensile testing
Tensile strength
kg/㎟
(MIN)
Yield point
kg/㎟
(MIN)
Elongation(%) (MIN)
Grade 11 Test piece
Grade 12 Test piece
Longitudinal
Grade 5 Test piece
transverse
11 Type A STKM11A 30 or more - 35 or more 30 or more
12 Type A STKM12A 35 or more 18 or more 35 or more 30 or more
B STKM12B 40 or more 28 or more 25 or more 20 or more
C STKM12C 48 or more 36 or more 20 or more 15 or more
13 Type A STKM13A 38 or more 22 or more 30 or more 25 or more
B STKM13B 45 or more 31 or more 20 or more 15 or more
C STKM13C 52 or more 39 or more 15 or more 10 or more
14 Type A STKM14A 42 or more 25 or more 25 or more 20 or more
B STKM14B 51 or more 36 or more 15 or more 10 or more
C STKM14C 56 or more 42 or more 15 or more 10 or more
15 Type A STKM15A 48 or more 28 or more 22 or more 17 or more
C STKM15C 59 or more 44 or more 12 or more 7 or more
16 Type A STKM16A 52 or more 33 or more 20 or more 15 or more
C STKM16C 63 or more 47 or more 12 or more 7 or more
17 Type A STKM17A 56 or more 35 or more 20 or more 15 or more
C STKM17C 66 or more 49 or more 10 or more 5 or more
18 Type A STKM18A 45 or more 28 or more 25 or more 20 or more
B STKM18B 50 or more 32 or more 23or more 18or more
C STKM18C 52 or more 39 or more 15 or more 10 or more
19 Type A STKM19A 50 or more 32 or more 23 or more 18 or more
C STKM19C 56 or more 42 or more 15 or more 10 or more
20 Type A STKM20A 55 or more 40 or more 23 or more 18 or more

Type Signal Tensile testing Intended use
C Si Mn P S
11 Type  A  STKM11A 0.12 Less than 0.35 Less than 0.60 Less than 0.040 Less than 0.040 Less than Starter Motor Yoke General use
12 Type A STKM12A 0.20 0.35 0.60 0.040 0.040

Cross Member
Jack Propeller Shaft
The Rod

B STKM12B
C STKM12C
13 Type A STKM13A 0.25 0.35 0.30~0.90 0.040 0.040 Propeller Shaft
Steering Shaft
Oil pressure Cylinder, Axle Tube
B STKM13B
C STKM13C
14 Type A STKM14A 0.30 0.35 0.30~1.00 0.040 0.040 Oil pressure Cylinder
Axle Tube
B STKM14B
C STKM14C
15 Type A STKM15A 0.25~0.35 0.35 0.35~1.00 0.040 0.040 Extensing Tube
Cross Member
C STKM15C
16 Type A STKM16A 0.35~0.45 0.40 0.40~1.00 0.040 0.040 Rocker Arm Tube
Axle Tube Steering System
C STKM16C
17 Type A STKM17A 0.45~0.55 0.40 0.40~1.00 0.040 0.040 Boring Rod
Axle Tube
C STKM17C
18 Type A STKM18A 0.18 0.55 1.50 0.040 0.040 Hydraulic prop
Fork Tube
Boom Repeated oil pressure Cylinder
B STKM18B
C STKM18C
19 Type A STKM19A 0.25 0.55 1.50 0.040 0.040  
C STKM19C
20 Type A STKM20A 0.25 0.55 1.60 0.040 0.040  

Division Tolerance for outer diameter
No. 1 50mm Less than
50mm or more
  ±0.5mm
±1%
No. 2 50mm Less than
50mm or more
  ±0.25mm
±0.5%
No. 3 25mm Less than
25mm or more
40mm or more
50mm or more
60mm or more
70mm or more
80mm or more
90mm or more
100mm or more 
40mm Less than
50mm Less than
60mm Less than
70mm Less than
80mm Less than
90mm Less than
100mm Less than
±0.12mm
±0.15mm
±0.18mm
±0.20mm
±0.23mm
±0.25mm
±0.30mm
±0.40mm
±0.50%
Steel Pipe for Building Structures

Advanced, high-performance steel pipe that can be found on almost any construction site.

In addition to delivering its highly trusted JIS-compliant steel pipe for building structures (e.g., STK and STKR) for a long time. In addition, we engage constantly and actively in R&D, so that we can deliver even more advanced and capable materials.

Tolerance:
Steel type Pipe Out diameter
(D)
Pipe wall thickness
(S)
Cold Drawing Pipe O.D.
(mm)
Tolerance
(mm)
W.T.
(mm)
Tolerance
(mm)
>30~50 ±0.3 ≤30 ±10%
>50~219 ±0.8%
Hot Rolled Pipe >219 ±1.0% >20 ±10%
Mechanical properties:
Standard Grade Tensile Strength
(MPa)
Yield strength
(MPa)
elongation
(%)
GB/T8162 10 ≥335 ≥205 ≥24
20 ≥390 ≥245 ≥20
35 ≥510 ≥305 ≥17
45 ≥590 ≥335 ≥14
Q345 ≥490 ≥325 ≥21
15CrMo ≥440 ≥295 ≥22
12Cr1MoV ≥490 ≥245 ≥22
ASTM A53
ASME SA53
A ≥330 ≥205 查看ASTM A53的表

查看ASME SA53的表
B ≥415 ≥240
Chemical composition:
Standard Grade Composition(%)
C Si Mn P S Cu Ni Mo Cr V
GB/T8162 10 0.07~0.14 0.17~0.37 0.35~0.65 ≤0.035 ≤0.035 ≤0.25 ≤0.25 / ≤0.15 /
20 0.17~0.24 0.17~0.37 0.35~0.65 ≤0.035 ≤0.035 ≤0.25 ≤0.25 / ≤0.25 /
35 0.32~0.40 0.17~0.37 0.50~0.80 ≤0.035 ≤0.035 ≤0.25 ≤0.25 / ≤0.25 /
45 0.42~0.50 0.17~0.37 0.50~0.80 ≤0.035 ≤0.035 ≤0.25 ≤0.25 / ≤0.25 /
Q345 0.12~0.20 0.20~0.55 1.20~1.60 ≤0.035 ≤0.035 ≤0.25 ≤0.25 / ≤0.25 /
15CrMo 0.12~0.18 0.17~0.37 0.40~0.70 ≤0.035 ≤0.035 ≤0.25 ≤0.30 0.40~0.55 0.80~1.10 /
12Cr1MoV 0.08~0.15 0.17~0.37 0.40~0.70 ≤0.035 ≤0.035 ≤0.25 ≤0.30 0.25~0.35 0.90~1.20 0.15~0.30
ASTMA53
ASMESA53
A ≤0.25 / ≤0.95 ≤0.05 ≤0.06 ≤0.40 ≤0.40 ≤0.15 ≤0.40 ≤0.08
B ≤0.30 / ≤1.20 ≤0.05 ≤0.06 ≤0.40 ≤0.40 ≤0.15 ≤0.40 ≤0.08

国标钢管执行标准及相关参数:

无缝钢管是一种具有中空截面、周边没有接缝的长条钢材。钢管具有中空截面,大量用作输送流体的管道,如输送石油、天然气、煤气、水及某些固体物料的管道等。



Tech & Service of Seamless pipe

Seamless pipes are extensively applied for the nuclear device, gas, petrochemical, ship building and boiler industries. Seamless pipes dominates 65% of market share in Chinese boiler industry.

How to make seamless pipe(seamless pipe process)?
Hot Piercing Workshop
Piercing process
The cross roll piercing and pilger rolling process in the size range from approx. 250 to 660 mm outside diameter.
Precision cold drawn steel tube production process
Pipe weld cracks
often follow different mechanisms can be divided into two types of thermal cracking and cold cracking.
How to calculate a steel pipe and tube theoretic weight
Calculate a steel pipe?
Pipe fittings are necessary to join together pipes, or to change the direction of an existing pipe.
Pipe beveling
Pipe beveling is the process where an angle is formed between the edge of the end of a pipe or tube and a plane perpendicular to the surface.
Steel pipe cutting machine
Pipe cutting
Cutting tools have a grinding wheel piece cutting machine (also known as toothless saw), hand saw, cutter and other hand tools.
Packing the steel pipes
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.


SUNNY STEEL

Our team are highly trained and experienced in servicing and producing all types of steel supplies. Whether you've got a large construction project, or need parts for industrial machinery, our team of steel fabrication consultants will ensure that your project is provided with the parts you need, when you need them.

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