A671 EFW Steel Pipe

astm a671, standard specification for electric-fusion-welded steel pipe for atmospheric and lower temperatures. grades shall designate the type of plate used while class shall designate the type of heat treatment performed during pipe manufacture. class shall be designated as to whether the weld is radiographically examined, and as to whether the pipe is pressure tested. 

plain carbon steel grades：ca 55, cb 60,cb 65,cb 70 cc 60,cc 65,cc 70

nickel steel grades: cf 65,cf 70,cf 65,cf 70

alloy steel grades: cja 115, cjb 115,cje 115,cjf 115,cjh 115,cjp 115

o.d：18"-56"（457.2-1422mm）

w.t：0.312"-2"（7.92-50.8mm）

unit length：5-12.3 meter

application of astm a671/a671m lsaw steel pipe:

pipe ordered under this specification is used for high-pressure service at atmospheric and lower temperatures. mainly used for oil and natural gas transmission.

manufacturing process:

astm a671 lsaw(jcoe) carbon steel pipe shall be double-welded, full-penetration welds made in accordance with procedures and by welders or welding operators qualified in accordance with the asme boiler and pressure vessel code, section ix.

heat treatment of astm a671 lsaw(jcoe) carbon steel pipe:

all classes other than 10, 11, 12 and 13 shall be heat treated in furnace controlled to ±15℃ and equipped with a recording hydrometer so that heating records are available.

chemical composition of a671 pipes

mechanical properties of a671 pipe