TORICH INTERNATIONAL LIMITED
TORICH INTERNATIONAL LIMITED The Steel Tube Maker
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Customized Surface Heavy Wall Steel Tubing Seamless Cold Drawn Type OD 5-120mm
Material:
Carbon and Alloy Steel, ferritic steel
Grade 1A, Grade3, Grade 4, Grade 6A, Grade 7A
Manufacture:
The pipes are made by seamless and welding process with the addition of no filler metal in the welding operation.
Grade 4 is manufactured by seamless process
Heat treatment:
All seamless and welded pipes, other than Grades 8 and 11, are heat treated to control their microstructure in accordance with methods of:
-Normalizing
-Quenched and Tempered
-Double Normalized and Tempeed
Chemical Requirements
| Element | Grade1 | Grade3 | Grade4 | Grade6 | Grade7 | Grade8 | Grade9 | Grade10 | Grade11 |
| C, max | 0.30 | 0.19 | 0.12 | 0.30 | 0.19 | 0.13 | 0.20 | 0.20 | 0.10 |
| Mn | 0.40-1.06 | 0.31-0.64 | 0.50-1.05 | 0.29-1.06 | 0.90 max | 0.90 max | 0.40-1.06 | 1.15-1.50 | 0.6 max |
| P, max | 0.025 | 0.025 | 0.025 | 0.025 | 0.025 | 0.025 | 0.025 | 0.035 | 0.025 |
| S, max | 0.025 | 0.025 | 0.025 | 0.025 | 0.025 | 0.025 | 0.025 | 0.015 | 0.025 |
| Si | -- | 0.18-0.37 | 0.08-0.37 | 0.10min | 0.13-0.32 | 0.13-0.32 | -- | 0.10-0.35 | 0.35max |
| Ni | -- | 3.18-3.82 | 0.47-0.98 | 0.40max | 2.03-2.57 | 8.40-9.60 | 1.60-2.24 | 0.25max | 35.0-37.0 |
| Cr | -- | -- | 0.44-1.01 | 0.30max | -- | -- | -- | 0.15max | 0.50max |
| Cu | -- | -- | 0.40-0.75 | 0.40max | -- | -- | 0.75-1.25 | 0.15max | -- |
| Al | -- | -- | 0.04-0.30 | -- | -- | -- | -- | 0.06max | -- |
| V | -- | -- | -- | 0.08 | -- | -- | -- | 0.12 | -- |
| Nb, max | -- | -- | -- | 0.02 | -- | -- | -- | 0.05 | -- |
| Mo, max | -- | -- | -- | 0.12 | -- | -- | -- | 0.05 | 0.50max |
| Co | -- | -- | -- | -- | -- | -- | -- | -- | 0.50max |