High Quality China ASME/API/GOST/DIN/En/JIS Seamless and Welded Steel Pipe

Overview

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Among the common structural seamless steel pipe materials, DIN1629 ST52 is one of the most commonly used materials. In Chinese standards, it usually corresponds to GB/T8162 Q345B. The two can be substituted for each other, but they are not completely corresponding. .

In terms of chemical composition:

DIN 1629 ST52: C: 0.17%max; P: 0.04%max; S:: 0.04%max; N: 0.009%max

GB/T 8162 Q345B: C: 0.2%max; P: 0.035%max; S:: 0.035%max; N: 0.012%max

It can be seen that the two standards jointly stipulate that the content of chemical elements is basically similar.

Mechanical performance:

DIN 1629 ST52: Tensile strength: 500~650Mpa; Yield strength: 335~355Mpa; Elongation (longitudinal): 21%min

GB/T 8162 Q345B: Tensile strength: 470~630Mpa; Yield strength: 295~345Mpa; Elongation (longitudinal): 20%min

The requirements for mechanical properties of the two are also roughly the same

Test items:

DIN 1629 requires tensile test, flattening test, tightness test, surface inspection, dimensional inspection; finished product analysis

GB/T8162 Q345B requires chemical composition inspection, tensile test, hardness test, 20℃ impact test, flattening test, bending test, non-destructive electrical test

It can be seen that the experimental project requirements of GB/T8162 Q345B basically cover DIN1629

Tolerance requirements:

DIN1629 stipulates:

OD tolerance：

OD≤100mm, ±1%or±0.5mm
100mm＜OD≤200mm, ±1%
OD＞200mm, ±1%
WT tolerance：

OD≤130mm: ≤2*standard WT: +15% -10%
2*standard WT＜s≤4*standard WT:+12.5% -10%
＞4*standard WT: ±9%
130mm＜OD≤320mm：≤0.05*standard WT:+17% -12.5%
0.05*standard WT＜s≤0.11*standard WT: ±12.5%
＞0.11*standard WT: ±10%
320mm＜OD≤660mm：≤0.05*standard WT: +20% -15%
0.05*standard WT＜s≤0.09*standard WT: +15% -12.5%
＞0.09*standard WT: +12.5% -10%

GB/T8162 stipulates:

OD tolerance:

±1% or ±0.5mm for the larger
WT tolerance:

OD≤102mm：±12.5% or ±0.4mm for the larger
OD＞102mm：WT≤0.05mm, ±15% or ±0.4mm for the larger
0.05mm＜WT≤0.1mm, ±12.5% or ±0.4mm for the larger
WT＞0.1mm, +12.5% -10%

The tolerances of the two are also roughly the same

Therefore, Q345B and ST52 can be substituted for each other when used in a normal environment and there is no special requirement. When the environment or requirements are more stringent, the comparison needs to be carefully considered.

Application

It Is Mainly Used To Make Carbon Structural Steel, Alloy Structural Steel and mechanical structures.

Main Grade

Grade Of Carbon Structural Steel: 10,20,35, 45,Q345,Q460,Q490,Q620,, Etc

Grade Of Alloy Structural Steel: 42CrMo,35CrMo, Etc

Chemical Component

Mechanical Property

Mechanical properties of high-quality carbon steel structural steel and low-alloy high-strength structural steel pipes

Mechanical properties of alloy steel pipes

Test Requirement

Chemical composition:

Stretch,Hardness,Shock,Squash,Bending,Ultrasonic testing,Eddy current,detection,Leak detection,Galvanized

Product Detail

Mechanical/Chemical&Fertilizer Pipes

GB/T 8162-2008

ASTM A519-2006

BS EN 10210-1-2006

ASTM A53/A53M-2012

GB 9948-2006

GB 6479-2013

GB/T 17396-2009