National Standards
Tube for Petroleum Cracking
Standard
GB9948
Application
It is used for the seamless steel tubes for furnace, heat exchangers and pipeline in petroleum refining factories.
Main Steel Tube Grades
10, 20, 12CrMo, 15CrMo, 1Cr2Mo, 1Cr5Mo, 1Cr19Ni9, 1Cr19Ni11Nb etc.
Other grades can also be provided after consulting with customers.
Chemical Composition
| Grade | Chemical Composition % | |||||||
| C | Si | Mn | P | S | Cr | Mo | Ni | |
| 10 | 0.07-0.14 | 0.17-0.37 | 0.35-0.65 | ≤0.035 | ≤0.035 | ≤0.15 | / | ≤0.25 |
| 20 | 0.17-0.24 | 0.17-0.37 | 0.35-0.65 | ≤0.035 | ≤0.035 | ≤0.25 | / | ≤0.25 |
| 12CrMo | 0.08-0.15 | 0.17-0.37 | 0.40-0.70 | ≤0.035 | ≤0.035 | 0.40-0.70 | 0.40-0.55 | ≤0.30 |
| 15CrMo | 0.12-0.18 | 0.17-0.37 | 0.40-0.70 | ≤0.035 | ≤0.035 | 0.80-1.10 | 0.40-0.55 | ≤0.30 |
| 1Cr2Mo | ≤0.15 | 0.50-1.00 | 0.30-0.60 | ≤0.035 | ≤0.030 | 2.15-2.85 | 0.45-0.65 | / |
| 1Cr5Mo | ≤0.15 | ≤0.50 | ≤0.60 | ≤0.035 | ≤0.030 | 4.00-6.00 | 0.45-0.60 | ≤0.60 |
| 1Cr19Ni9 | 0.04-0.10 | ≤1.00 | ≤2.00 | ≤0.035 | ≤0.030 | 18.00-20.00 | / | 8.00-11.00 |
| 1Cr19Ni11Nb | 0.04-0.10 | ≤1.00 | ≤2.00 | ≤0.035 | ≤0.030 | 17.00-20.00 | / | 9.00-13.00 |
Mechanical Properties
| Grade | Mechanical Properties | |||
| Tensile Strength MPa | Yield Strength MPa | Elongation % | Impact Energy J | |
| 10 | 330-490 | ≥205 | ≥24 | / |
| 20 | 410-550 | ≥245 | ≥21 | ≥39 |
| 12CrMo | 410-560 | ≥205 | ≥21 | ≥55 |
| 15CrMo | 440-640 | ≥235 | ≥21 | ≥47 |
| 1Cr2Mo | ≥390 | ≥175 | ≥22 | ≥92 |
| 1Cr5Mo | ≥390 | ≥195 | ≥22 | ≥92 |
| 1Cr19Ni9 | ≥520 | ≥205 | ≥35 | / |
| 1Cr19Ni11Nb | ≥520 | ≥205 | ≥35 | / |
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