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carbon steel seamless steel pipes

PIC-(carbon steel seamless steel pipes)

Carbon steel seamless steel pipes have two type forming. One is hot rolling, another is cold drawing.
Carbon steel fluid pipe tolerance is as the following.

Type of steel tube	Steel tube size mm		Deviation
Type of steel tube	Steel tube size mm		Ordinary grade	Senior
Hot rolling (extrusion, expansion) tube	Outside diameterD	All	+1%（Minimum+0.50）	-
Hot rolling (extrusion, expansion) tube	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%

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