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TORICH INTERNATIONAL LIMITED
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ASTM A53 Gr.B TypeS Cold Drawn Seamless Structural Pipes
Size range: O.D.: 6-168mm W.T.:1-15mm L: max 12000mm
Steel Grade and Chemical Compositions:
| Steel Grade | C | Mn | P | S | Cr | Cu | Mo | Ni | V |
| max | max | max | max | max | max | max | max | max | |
| A | 0.25 | 0.95 | 0.05 | 0.045 | 0.40 | 0.40 | 0.15 | 0.40 | 0.08 |
| B | 0.30 | 1.2 | 0.05 | 0.045 | 0.40 | 0.40 | 0.15 | 0.40 | 0.08 |
Mechanical Properties:
| Grade | Tensil Strength Mpa | Yield Point Mpa | Elongtation % |
| A | ≥330 | ≥205 | 20 |
| B | ≥415 | ≥240 | 20 |
Manufacture:
Tubes are made by seamless process.
Tolerance:
Diameter-- For pipe NPS1 1/2 (DN40) or smaller, the outside diameter at any point shall not vary more than ± 1/64in (0.4mm) from the specified outside diameter. For pipe NPS2 (DN50) or larger, the outside diameter shall not vary more than ±1% from the specified outside diameter.
Thickness—The minimum wall thickness at any point shall be not more than 12.5% under the specified wall thickness.
Workmanship, Finish, and Appeaerance:
The pipe manufacturer shall explore a sufficient number of visual surface imperfections to provide reasonable assurance that they have been properly evaluated with respect to depth.
Test and Inspection:
- Mechanical Test
- Tension Test
- Flattening Test
- Hardness Test
- Bend Test
- Hydrostatic Test
- Nondestructive Electric Test
