Petroleum cracking tube
For the manufacture of furnace tubes, heat exchanger tubes and pipes for petroleum refineries
Product description
● Standard
GB9948-2013 Main steel grades: 10、20、12CrMo、15CrMo
● Uses
For the manufacture of furnace tubes, heat exchanger tubes and pipes for petroleum refineries
● Size deviation
Steel Tube Types | Tube size | Allowable Deviation | |
Hot rolled tube | Outer diameter | ≤ 159 | ± 1.00% |
> 159 | ± 1.25% | ||
Wall thickness | ≤ 20 | ± 12.5% | |
> 20 | ± 10.0% | ||
Cold-drawn tube | Outer diameter | ≤ 30 | ± 0.20 |
30~50 | ± 0.30 | ||
> 50 | ± 0.8% | ||
Wall thickness | ≤ 3 | +12%－10% | |
> 3 | ± 10% | ||
● Chemical composition, mechanical properties
Standard | Steel grade | Chemical composition (%) | ||||||
C | Si | Mn | Ni | Cr | Mo | P.S | ||
GB9948 | 10 | 0.17 ～ 0.14 | 0.17 ～ 0.37 | 0.35 ～ 0.65 | ≤ 0.25 | ≤ 0.15 | / | ≤ 0.035 |
20 | 0.17 ～ 0.24 | 0.17 ～ 0.37 | 0.35 ～ 0.65 | ≤ 0.25 | ≤ 0.25 | / | ≤ 0.035 | |
12CrMo | 0.08 ～ 0.15 | 0.17 ～ 0.37 | 0.40 ～ 0.70 | ≤ 0.30 | 0.40 ～ 0.70 | 0.40 ～ 0.55 | ≤ 0.035 | |
15CrMo | 0.12 ～ 0.18 | 0.17 ～ 0.37 | 0.40～ 0.70 | ≤ 0.30 | 0.80 ～ 1.10 | 0.40 ～ 0.55 | ≤ 0.035 | |
Mechanical properties | Tensile strength (MPa) | Tensile strength (MPa) | Elongation(%) | |||||
10 | 330 ～ 490 | ≥ 205 | ≥ 24 | |||||
20 | 410 ～ 550 | ≥ 245 | ≥ 21 | |||||
12CrMo | 410 ～ 560 | ≥ 205 | ≥ 21 | |||||
15CrMo | 440 ～ 640 | ≥ 235 | ≥ 21 | |||||