Seamless steel tube for petroleum cracking, produced according to GB 9948-88
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This tube is used for petroleum cracking. The seamless petroleum cracking steel tube is produced by hot rolling, cold drawn, according to the Chinese standard GB 9948-88.
GB 9948-88, a standard applies to the production of hot rolling or cold drawn seamless steel tube used for petroleum cracking, heat exchanger and pipeline.
Seamless Steel Tubes for Petroleum
Steel Grade: 20 12CrMo 1Cr5Mo 1Cr19Ni11Nb
Feature for seamless petroleum cracking pipe: Hot rolling/ cold drawn Seamless Steel Tube
Application of seamless petroleum cracking tube: For petroleum cracking, heat exchanger and pipeline
Produce method for seamless petroleum cracking pipe: Hot rolling, cold drawn
The seamless petroleum cracking tube`s material/Steel grade: 10#/ 20# /12CrMo/ 15CrMo/ 1Cr2Mo/ 1Cr5Mo/ 1Cr19Ni9/ 1Cr19Ni11Nb
Chemical composition:
| Steel Grade | Chemical composition % |
| C | Mn | Si | Cr | Mo | Ni | Nb+Ta | S | P |
| 10 | 0.07-0.14 | 0.35-0.65 | 0.17-0.37 | ≤0.15 | / | ≤0.25 | / | ≤0.035 | ≤0.035 |
| 20 | 0.17-0.24 | 0.35-0.65 | 0.17-0.37 | ≤0.25 | / | ≤0.25 | / | ≤0.035 | ≤0.035 |
| 12CrMo | 0.08-0.15 | 0.40-0.70 | 0.17-0.37 | 0.40-0.70 | 0.40-0.55 | ≤0.30 | / | ≤0.035 | ≤0.035 |
| 15CrMo | 0.12-0.18 | 0.40-0.70 | 0.17-0.37 | 0.80-1.10 | 0.40-0.55 | ≤0.30 | / | ≤0.035 | ≤0.035 |
| 1Cr2Mo | ≤0.15 | 0.30-0.60 | 0.50-1.00 | 2.15-2.85 | 0.45-0.65 | / | / | ≤0.030 | ≤0.035 |
| 1Cr5Mo | ≤0.15 | ≤0.60 | ≤0.50 | 4.00-6.00 | 0.45-0.60 | ≤0.60 | / | ≤0.030 | ≤0.035 |
| 1Cr19Ni9 | 0.04-0.10 | ≤2.00 | ≤1.00 | 18.00-20.00 | / | 8.00-11.00 | / | ≤0.030 | ≤0.035 |
| 1Cr19Ni11Nb | 0.04-0.10 | ≤2.00 | ≤1.00 | 17.00-20.00 | / | 9.00-13.00 | ≥8C%-1.00% | ≤0.030 | ≤0.035 |
Mechanical Properties :
| Steel Grade | Mechanical Properties |
| Tensile Strength MPa | Yield Strength MPa | Elongation % | Impact energy Ak J | Hardness HB |
| 10 | 330-490 | ≥205 | ≥24 | / | / |
| 20 | 410-550 | ≥245 | ≥21 | ≥39 | / |
| 12CrMo | 410-560 | ≥205 | ≥21 | ≥55 | ≤156 |
| 15CrMo | 440-640 | ≥235 | ≥21 | ≥47 | ≤170 |
| 1Cr2Mo | ≥(390) | ≥(175) | ≥(22) | ≥(92) | ≤(179) |
| 1Cr5Mo | ≥390 | ≥195 | ≥22 | ≥92 | ≤187 |
| 1Cr19Ni9 | ≥520 | ≥205 | ≥35 | / | / |
| 1Cr19Ni11Nb | ≥520 | ≥205 | ≥35 | / | / |
1. Tolerance for the outer diameter and wall thickness:
| Steel Type | Steel Size | Tolerance |
| Hot rolling tube | OD | ≤159 | ±1.00% |
| ＞159 | ±1.25% |
| WT | ≤20 | ±12.5% |
| ＞20 | ±10.0% |
| Cold drawn tube | OD | ≤30 | ±0.20 |
| 30-50 | ±0.30 |
| ＞50 | ±0.8% |
| WT | ≤3 | +12% -10% |
| ＞3 | ±10& |
2. Bending tolerance :
WT≤15 mm, Bending≤1.5mm/m
WT＞15mm, Bending≤2.0mm/m
3. End shape of the gas cylinder tube:
Both ends of the pipe should be cut to a complete end surface perpendicular to the axis, and remove burrs
4. Ovality and Wall unevenness:
The ovality and wall unevenness should be no more than 80% of the OD and wall thickness.(Or according to customer`s request)
5. Delevery condition:
For 10#/ 20#, hot rolling tube should be rolling finished, and the cold drawn tubes should be normalized.
For 12CrMo/ 15CrMo/ 1Cr2Mo, hot rolling tube should be rolling finished and tempered, and the cold drawn tubes should be normalized and tempered.
For 1Cr5Mo, the tubes should be annealed.
For 1Cr19Ni9, solution treatment is needed, and the solution temperature should be no less than 1040 ℃.
For 1Cr19Ni11Nb, solution treatment is needed, and the solution temperature for the hot rolling tube should be no less than 1040 ℃, while for the cold drawn tube should be no less than 1095 ℃.
6. Tests:
1.Bending Test
2. Hydraulic test:
Eddy current testing, ultrasonic testing can be used instead of hydraulic tests.
3. Flattening test
4. Expand test
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