Seamless pipe are extensively applied for the nuclear device, gas, petrochemical, ship building and boiler industries. Below we will introduce the wall thickness tolerance of seamless steel pipe.
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Types |
Sizes |
Allowed Tolerance |
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Ordinary Steel Pipe |
Senior Steel Pipe |
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|
Hot rolled |
Out diameter |
<50 |
± 0.50 mm |
± 0.40 mm |
|
≥50 |
± 1 % |
± 0.75 % |
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|
Wall thickness |
<4 |
± 12.5 % |
± 10 % |
|
|
4-20 |
15% |
± 10 % |
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|
-12.50% |
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|
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≥20 |
± 12.5 % |
± 10 % |
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|
Cold drawn |
Out diameter |
6-10 |
± 0.20 mm |
± 0.10 mm |
|
>10-30 |
± 0.40 mm |
± 0.20 mm |
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|
>30-50 |
± 0.45 mm |
± 0.25 mm |
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|
>50 |
± 1 % |
± 0.5 % |
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|
Wall thickness |
≤1 |
± 0.15 mm |
± 0.12 mm |
|
|
1-3 |
15% |
± 10 % |
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|
- 10 % |
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|
>3 |
12.5 |
± 10 % |
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|
-10% |
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