Carbon and carbon-manganese steel seamless steel tubes and pipes for ship
Standard: GB/T5312-2009
Size OD 10-630 mm
WT 2.0-20mm
Tolerances for OD and WT
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Pipe type
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sizemm
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Allowed tolerances
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Hot rolled (expanded, squeezed) tubes
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OD
D
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≤159
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±1.0,min±0.5mm
|
||
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>159
|
±1.25
|
||||
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WT
S
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≤20
|
+15% +0.45mm
-10%, MIN-0.30mm
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|||
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>20
|
±10
|
||||
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D≥351
hot expanded tubes
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±15
|
||||
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Cold drawn(rolled) tubes
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OD
D
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≤30
|
±O.2mm
|
||
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30<D≤50< DIV>
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±O.30mm
|
||||
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>50
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±0.8
|
||||
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1.5≤S≤3.O
|
+12.5 %+10 %
|
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>3.0
|
10
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