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Credibility ,Types of steel tubes |
Outer diameters |
wall thickness |
||
Cold-rolled tubes |
Rube size(mm) |
tolerances (mm) |
Tube sizes (mm) |
Tolerances (mm) |
>30~50 |
±0.3 |
≤30 |
±10% |
|
>50~219 |
±0.8% |
|||
Hot-rolled tubes |
>219 |
±1.0% |
>20 |
±10% |
Standard code |
Models of steel tubes |
Tensile strength(MPa) |
Yield strength(MPa) |
Elongation(%) |
GB/T5312 |
320 |
320~410 |
≥195 |
≥25 |
360 |
360~480 |
≥215 |
≥24 |
|
410 |
410~530 |
≥235 |
≥22 |
|
460 |
460~580 |
≥265 |
≥21 |
|
490 |
490~610 |
≥285 |
≥21 |
Standard code |
Models of steel tubes |
Chemical compisition(%) |
||||
C |
Si |
Mn |
P |
S |
||
GB/T5312 |
320 |
≤0.16 |
≤0.35 |
0.40~0.70 |
≤0.035 |
≤0.035 |
360 |
≤0.17 |
≤0.35 |
0.40~0.80 |
≤0.035 |
≤0.035 |
|
410 |
≤0.21 |
≤0.35 |
0.40~1.20 |
≤0.035 |
≤0.035 |
|
460 |
≤0.22 |
≤0.35 |
0.80~1.40 |
≤0.035 |
≤0.030 |
|
490 |
≤0.23 |
≤0.35 |
0.80~1.50 |
≤0.035 |
≤0.030 |
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Yaang Pipe Industry Co., Ltd. is an international supplier of piping solutions for flange, butt welding fittings, socket welding fittings and threaded fittings. Our products are widely used in different industrial fields, including oil and gas, chemical industry, petrochemical industry, power plant, pulp and paper industry, environmental and water conservancy engineering, engineering projects, etc.