Steel pipe wall thickness grade expression method
Pipe wall thickness grades of the series of methods expressed in different standards in different ways.
There are three main methods:
1) The tube table number (Sch) said: For carbon steel pipe wall thickness: Sch10,20,30,40,60,80,100,120,140,160 and other 10 levels (if the number followed by S, said stainless steel Tube); for stainless steel wall thickness series: 5S, 10S, 40S, 80S four levels
2) expressed in terms of steel pipe weight, such as STD (standard weight), XS (thickening pipe), XXS (thick pipe)
3) The steel pipe wall thickness size that "pipe diameter × wall thickness," such as φ89X4
1,steel tube table number (Sch.) Said wall thickness series
This is the 1938 American National Standards Institute ANSIB36.10 (welding and seamless steel pipe) standards.
The tube gauge (Sch.) Is the value at which the ratio of the allowable stress of a material at design pressure to the design temperature is multiplied by 1000 and rounded.
Namely Sch. = P / [ó] t × 1000 (1-2-1) where P-design pressure, MPa; [ó] t- allowable stress of material at design temperature, MPa.
Seamless steel pipe and welded pipe table number can check the information to determine.
ANSI B36.10 and JIS standard steel pipe table number; Sch10,20,30,40,60,80,100,120,140,160. Stainless steel pipe ANSI ANSI B36.19 table number is: 5S, 10S, 40S, 80S.
2, the weight of the steel pipe wall thickness of the wall thickness series
US MSS and ANSI regulations to indicate the weight of the steel pipe wall thickness method, the steel pipe wall thickness is divided into; three:
(1) Standard weight tube is indicated by STD;
(2) thickened tube to XS;
(3) Extra thick tube to XXS said.
<DN250mm tube, Sch40 equivalent STD tube.
<DN200mm tube, Sch80 equivalent to the XS tube.
3, the wall thickness of steel pipe wall thickness series
China, ISO and Japan part of the standard pipe wall thickness of steel pipe wall thickness that series. For example: China's low-pressure fluid delivery pipe wall thickness is divided into ordinary pipe and reinforced pipe; for the delivery of welded steel pipe, Japan's JIS standard SGP and STPY welded steel pipe series only provides the actual thickness series. The specifications for this type of steel pipe diameter × wall thickness. For example ф60.5 × 3.8.
