钢级(GB/T9711.1)	L175(Ⅰ、Ⅱ类)	L210	L245	L290	L320	L360	L390	L415	L450	L485	L555
钢级(ANSI/API Spec 5L )	A25(Ⅰ、Ⅱ类)	A	B	X42	X46	X52	X56	X60	X65	X70	X80
规定总伸长应力Rt0.5(min)Mpa	175	210	245	290	320	360	390	415	450	485	555
抗拉强度(min)Mpa	315	335	415	415	435	460	490	520	535	570	625

化学成分

标准	牌号	化学成分(％)								CEV(％)
		C	Si	Mn	P	S	V	Nb	Ti
API SPEC 5L GB/T9711.2	B	≤0.16	≤0.40	≤1.10	≤0.020	≤0.010	－	－	－	≤0.42
	X42	≤0.17	≤0.40	≤1.20	≤0.020	≤0.010	≤0.05	≤0.05	≤0.04	≤0.42
	X52	≤0.20	≤0.45	≤1.60	≤0.020	≤0.010	≤0.10	≤0.05	≤0.04	≤0.45
	X60	≤0.21	≤0.45	≤1.60	≤0.020	≤0.010	≤0.15	≤0.05	≤0.04	协议
	X65	≤0.16	≤0.45	≤1.60	≤0.020	≤0.010	≤0.06	≤0.05	≤0.06	≤0.45
	X70	≤0.16	≤0.45	≤1.70	≤0.020	≤0.010	≤0.06	≤0.05	≤0.06	≤0.45