used for petrol,natural gas and coal bed gas exploitation engineering.main steel grades:H44,J55,K55,M65,N80-1,N80Q,L80,C90,T95,P110,Q125,FS140

GB/T 9711.1-1997(iso 3183-1)

GB/T 9711.2-1997(iso 3183-2)

GB/T 9711.3-1997(iso 3183-3)

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