JIS G3444 seamless steel pipe is commonly used in the field of building structure, such as scaffolding, footing piles, and foundation piles, etc. For these steel pipes, JIS G3444 standard specifies requirement for the dimensions of steel pipes.
Tolerances on outside diameter
|
Category |
Outside diameter |
Tolerance on outside diameter |
|
Class 1 |
<50 mm |
±0.5 mm |
|
≥50mm |
±1% |
|
|
Class 2 |
<50 mm |
±0.25 |
|
≥50mm |
±0.5% |
|
|
Note: (a) Class 1 is applicable to electric resistance welded steel pipes and automatic arc welded steel tubes of outside diameter over 350 mm. The tolerance on outside diameter at the end of tubes is ±0.5%. (b) Hot finished seamless steel tubes shall follow class 1. (c) The measurement of tubes with an outside diameter over 350 mm may be based on measurement of the circumference. |
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Tolerance on wall thickness
|
Classification |
Seamless steel tube |
Other than seamless steel tube |
||
|
Class 1 |
Under 4mm |
+0.6mm, -0.5mm |
Under 4mm |
+0.6mm, -0.5mm |
|
4mm or over |
+15%, -12.5% |
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| 4mm or over to and excl. 12mm | +15%, -12.5% | |||
| 12mm or over | +15%, -1.5mm | |||
|
Class 2 |
Under 3mm |
±0.3mm |
Under 3mm |
±0.3mm |
|
3mm or over |
±10% |
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| 3mm or over to and excl. 12mm | ±10% | |||
| 12mm or over | +10%, -1.2mm | |||
|
Note (a) The tolerances on wall thickness of hot finished seamless steel tubes shall follow Class 1. (b) The tolerance on wall thickness of tubes exceeding 1016.0mm in outside diameter may be agreed upon between the purchaser and the manufacturer. |
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Both JIS G3444 seamless and welded steel pipes can be supplied by us. Carbon steel pipes are available in multiple dimensions. If you have any needs, please contact us for favorable price.
