TORICH INTERNATIONAL LIMITED
TORICH INTERNATIONAL LIMITED The Steel Tube Maker
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TORICH GB/T9948 12CrMo Seamless Steel Tubes For Petrleum Cracking
Table1:The Tolerances of Outer Diameter and Wall Thickness Unit:mm
| Sort Code | Manufacuring Method | Nominal Size | Tolerances | ||
| Common Level | High Level | ||||
| W-H | Hot Rolling (Extrusion) | Outer Diameter D | ≤54 | ±0.50 | ±0.30 |
| ＞54~325 | ±1%D | ±0.75%D | |||
| ＞325 | ±1%D | - | |||
| Wall Thicknass S | ≤20 | +15%S -10%S | ±10%S | ||
| ＞20 | +12.5%S -10%S | ±10%S | |||
| Hot Expand | Outer Diameter D | All | ±1%D | ||
| Wall Thicknass S | All | ±15%S | |||
| W-C | Cold Drawn(Rolling) | Outer Diameter D | ≤25.4 | ±0.15 | |
| ＞25.4~40 | ±0.20 | ||||
| ＞40~50 | ±0.25 | ||||
| ＞50~60 | ±0.30 | ||||
| ＞60 | ±0.75%D | ±0.5%D | |||
| Wall Thicknass S | ≤3.0 | ±0.3 | ±0.2 | ||
| ＞3.0 | ±10%S | ±7.5%S | |||
Table2:The Tolerance of Minimum Wall Thickness Unit :mm
| Sort Code | Manufacturing Method | Minimum Wall Thickness Smin | Tolerance | |
| Common Level | High Level | |||
| W-H | Hot Rolling(Extrusion) | ≤4.0 | +0.90 0 | +0.70 0 |
| ＞4.0 | +25%Smin 0 | +22%Smin 0 | ||
| W-C | Cold Drawn(Rolling) | ≤3.0 | +0.6 0 | +0.4 0 |
| ＞3.0 | +20%Smin 0 | +15%Smin 0 | ||
Table3 Steel grade and chemical composition
| Steel grade | Chemical composition % | |||||||||||
| C | Si | Mn | Cr | Mo | Ni | Nb | Ti | V | Cu | P | S | |
| ≤ | ||||||||||||
| 10 | 0.07~ 0.13 | 0.17~ 0.37 | 0.35~ 0.65 | ≤0.15 | ≤0.15 | ≤ 0.25 | — | — | ≤0.08 | ≤0.20 | 0.025 | 0.015 |
| 20 | 0.17~ 0.23 | 0.17~ 0.37 | 0.35~ 0.65 | ≤0.25 | ≤0.15 | ≤ 0.25 | — | — | ≤0.08 | ≤0.20 | 0.025 | 0.015 |
| 12CrMo | 0.08~ 0.15 | 0.17~ 0.37 | 0.40~ 0.70 | 0.40~ 0.70 | 0.40~ 0.55 | ≤ 0.30 | — | — | — | ≤0.20 | 0.025 | 0.015 |
| 15CrMo | 0.12~ 0.018 | 0.17~ 0.37 | 0.40~ 0.70 | 0.80~ 1.10 | 0.40~ 0.55 | ≤ 0.30 | — | — | — | ≤0.20 | 0.025 | 0.015 |
| 12CrlMo | 0.08~ 0.15 | 0.50~ 1.00 | 0.30~ 0.60 | 1.00~ 1.50 | 0.45~ 0.65 | ≤ 0.30 | — | — | — | ≤0.20 | 0.025 | 0.015 |
| 12CrlMoV | 0.08~ 0.15 | 0.17~ 0.37 | 0.40~ 0.70 | 0.90~ 1.20 | 0.25~ 0.35 | ≤ 0.30 | — | — | 0.15~ 0.30 | ≤0.20 | 0.025 | 0.015 |
| 12Cr2Mo | 0.08~ 0.15 | ≤0.50 | 0.40~ 0.60 | 2.00~ 2.50 | 0.90~ 1.13 | ≤ 0.30 | — | — | — | ≤0.20 | 0.025 | 0.015 |
| 12Cr5MoI 12Cr5MoNT | ≤ 0.15 | ≤0.50 | 0.30~ 0.60 | 4.00~ 6.00 | 0.45~ 0.60 | ≤ 0.60 | — | — | — | ≤0.20 | 0.025 | 0.015 |
| 12Cr9MoI 12Cr9MoNT | ≤ 0.15 | 0.25~ 1.00 | 0.30~ 0.60 | 8.00~ 10.00 | 0.90~ 1.10 | ≤ 0.60 | — | — | — | ≤0.20 | 0.025 | 0.015 |
| 07Cr19Ni10 | 0.04~ 0.10 | ≤ 1.00 | ≤2.00 | 18.00~ 20.00 | — | 8.00~ 11.00 | — | — | — | — | 0.030 | 0.015 |
| 07Cr18Ni11Nb | 0.04~ 0.10 | ≤ 1.00 | ≤2.00 | 17.00~ 19.00 | — | 9.00~ 12.00 | 8C~ 1.10 | — | — | — | 0.030 | 0.015 |
| 07Cr19Ni11NTi | 0.04~ 0.10 | ≤0.75 | ≤2.00 | 17.00~ 20.00 | — | 9.00~ 13.00 | — | 4C~ 0.60 | — | — | 0.030 | 0.015 |
| 022Cr17Ni12Mo2 | ≤ 0.30 | ≤1.00 | ≤2.00 | 16.00~ 18.00 | 2.00~ 3.00 | 10.00~ 14.00 | — | — | — | — | 0.030 | 0.015 |
