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seamless pipe produce tech

PIC-(seamless pipe produce tech)
 
Type of steel tube Steel tube size
mm
Deviation
Ordinary grade Senior
Hot rolling (extrusion, expansion) tube Outside diameterD All +1%(Minimum+0.50) -
Wall thicknessS All +15%(Minimum+0.45)
-12.5%(Minimum-0.40)
-
Cold drawing (rolling) tube Outside diameterD 6~10 +0.20 +0.15
>10~30 +0.40 +0.20
>30~50 +0.45 +0.30
>50 +1% +0.8%
Wall thicknessS ≤1 +0.15 +0.12
>1~3 +15%
-10%
+12.5%
-10%
>3 +12.5%
-10%
+10%
Note: the outer diameter is not less than 351mm of the thermal expansion tube, the wall thickness allows the deviation of +18%