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StandardsGB3087 Chinese national standardApplicationUsed as the pipes on the heated side of low and medium pressure boilers(normally with operating pressure not higher than 5.88Mpa )
Specifications of major steel10,20
Diamensional tolerances:
Types of steel tubes | Outer diameters | Wall thickness | ||
Cold-rolled tubes | Tube sizes(mm) | Tolerances(mm) | Tube sizes (mm) | Tolerances(mm) |
3050 | ±0.3 | 320 | ±10 | |
Mechanical properties:
| Standard codes | Models of steel tubes | Tensite strengthMPa | Yield strengthMPa | Elongation | Hardness |
GB3087 | 10 | 335475 | ≥195 | ≥24 | / |
20 | 410550 | ≥245 | ≥20 | / | |
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| Standard codes | Models of steel tubes | Chemical compositions | ||||||||||||||
C | Si | Mn | P | S | Cr | Mo | Cu | Ni | V | Al | W | Ti | Nb | N | ||
GB3087 | 10 | 0.07∼0.13 | 0.17-0.37 | 0.38∼0.65 | ≤0.030 | ≤0.030 | 0.3∼0.65 | / | ≤0.25 | ≤0.30 | / | / | ||||
20 | 0.17∼0.23 | 0.17∼0.37 | 0.38∼0.65 | ≤0.030 | ≤0.030 | 0.3∼0.65 | / | ≤0.25 | ≤0.30 | / | / | |||||
GB3087 Seamless steel pipes for low and medium pressure boilers