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- Place of Origin: CANGZHOU
- Brand Name: xinlian
- Model Number: 1
Standard of implementation： Chinese GB3087
Application: used in low-pressure boiler (working pressure is generally greater than 5.88Mpa, working temperature at 450 below) of the heating surface pipe, collecting box and steam pipe
Major steel grade ： Grade10 、 20 （After consultation, can also provide other special grade of steel pipe）
- Place of Origin: CANGZHOU
- Brand Name: xinlian
- Model Number: 1
Chemical composition and mechanical properties ：
Standard | Steel grade | Chemical constituents (%) | ||||||
C | Mn | Si | Cr | Ni | Cu | P.S | ||
GB3087 | 10 | 0.07～0.14 | 0.35～0.65 | 0.17～0.37 | ≤ 0.15 | ≤ 0.30 | ≤ 0.20 | ≤ 0.030 |
20 | 0.17～0.24 | 0.35～0.65 | 0.17～0.37 | ≤ 0.25 | ≤ 0.25 | ≤ 0.20 | ≤ 0.030 | |
Mechanical properties | Tensile strength (MPa) | Yield strength (MPa) | Elongation (%) | |||||
10 | 335～475 | ≥ 195 | ≥ 24 | |||||
20 | 410～550 | ≥ 245 | ≥ 20 | |||||
Dimensional tolerance:
Type of steel tube | Steel tube size mm | Deviation | ||
Ordinary grade | Senior | |||
Hot rolling (squeeze) tube | Outside diameter | ≤159 | 1.0%(The minimum value is 0.50mm) | 1.0%(The minimum value is 0.5mm) |
>159 | 1.0% | 1.0% | ||
Wall thickness S | ≤20 | 15%(The minimum value is 0.45mm)
| 1.0%(The minimum value is 0.30mm) | |
-12.5%(The minimum value is-0.35mm) | ||||
>20 | 12.5% | 10% | ||
>20 | 12.5% | 10% | ||
D≥351Heat expanding steel tube | 15% | |||
Cold drawing (rolling) tube | Outside diameter D | 10~30 | 0.40mm | 0.20mm |
>30~50 | 0.45mm | 0.25mm | ||
>50 | 1.0% | 0.75% | ||
Wall thickness S | 1.5~3.0 | 15% | 10% | |
-10% | ||||
>3.0 | 12.5% | 10% | ||
-10% | ||||