National Standards
Boiler Tube
Seamless Steel Tubes and Pipes for Boiler
Standard
GB5310
Application
It is used for manufacturing heating-pipelines, containers, coal-saving devices, superheaters and reheaters of high pressure boilers. (P>9.8MPa, 450℃<T<650℃)
Main Steel Tube Grades
20G, 20MnG, 15MoG, 15CrMoG, 12Cr2MoG, 12Cr1MoVG etc.
Other grades can also be provided after consulting with customers.
Chemical Composition
| Standard | Grade | Chemical Composition % | |||||||
| C | Si | Mn | P | S | Cr | Mo | V | ||
| GB5310 | 20G | 0.17-0.24 | 0.17-0.37 | 0.35-0.65 | ≤0.030 | ≤0.030 | / | / | / |
| 20MnG | 0.17-0.24 | 0.17-0.37 | 0.70-1.00 | ≤0.030 | ≤0.030 | / | / | / | |
| 15MoG | 0.12-0.20 | 0.17-0.37 | 0.40-0.80 | ≤0.030 | ≤0.030 | / | 0.25-0.35 | / | |
| 15CrMoG | 0.12-0.18 | 0.17-0.37 | 0.40-0.70 | ≤0.030 | ≤0.030 | 0.80-1.10 | 0.40-0.55 | / | |
| 12Cr2MoG | 0.08-0.15 | ≤0.50 | 0.40-0.70 | ≤0.030 | ≤0.030 | 2.00-2.50 | 0.90-1.20 | / | |
| 12Cr1MoVG | 0.08-0.15 | 0.17-0.37 | 0.40-0.70 | ≤0.030 | ≤0.030 | 0.90-1.20 | 0.25-0.35 | 0.15-0.30 | |
Mechanical Properties
| Standard | Grade | Mechanical Properties | ||
| Tensile Strength MPa | Yield Strength MPa | Elongation % | ||
| GB5310 | 20G | ≥415 | ≥245 | ≥24 |
| 20MnG | 410-550 | ≥240 | ≥22 | |
| 15MoG | 450-600 | ≥270 | ≥22 | |
| 15CrMoG | 440-640 | ≥235 | ≥21 | |
| 12Cr2MoG | 450-600 | ≥280 | ≥20 | |
| 12Cr1MoVG | 470-640 | ≥255 | ≥21 | |
