According to GB/T9711.1 pipeline steel pipe performance requirements, according to the different tempering temperature, can be divided into the following kinds of tempering: [1] Low temperature tempering (150-250 degrees) The microstructure obtained by low temperature tempering is tempered martensite. Its purpose is to reduce the quenching stress and brittleness of hardened steel on the premise of maintaining its high hardness and high wear resistance, so as to avoid cracking or premature damage during use. It is mainly used for all kinds of high carbon cutting tools, measuring tools, GB/T9711.1 pipeline steel pipe, rolling bearings and carburizing parts, etc., the hardness after tempering is GENERALLY HRC58-64. [2] Moderate temperature tempering (250-500 degrees) The microstructure obtained by moderate tempering is tempered trostite. The purpose is to obtain high yield strength, elastic limit and high toughness. Therefore, it is mainly used for all kinds of GB/T9711.1 pipeline steel pipe and hot mold treatment, after tempering hardness is generally HRC35-50. [3] High temperature tempering (500-650 degrees) The microstructure obtained by high temperature tempering is tempered sortensite. Commonly, the heat treatment combined with quenching and tempering is called quenching and tempering. Its purpose is to obtain better comprehensive mechanical properties of strength, hardness, plasticity and toughness. Therefore, it is widely used in automobiles, GB/T9711.1 pipeline steel pipe, machine tools and other important structural parts, such as connecting rod, bolt, gear and shaft. The hardness after tempering is generally HB200-330.B, X42, X52, X60, X65, X70 L245 L290 L320 L360 L390 L450 L485

Standard	Product Level	Steel Grade	Yield Strength (min), Mpa	Tensile Strength（MPa）
API 5L GB/T9711.2	PSL 1	A or L210	210	335
		B or L245	245	415
		x42 or L290	290	415
		X46 or L320	320	435
		X52 or L360	360	460
		X56 or L390	390	490
		X60 or L415	415	520
		X70	483	565
	PSL 2	BR or L245R	245~450	415~760
		X42R or L290R	290~495	415~760
		BN or L245N	245~450	415~760
		X42N or L290N	290~495	415~760
		X46N or L320N	320~525	435~760
		X52N or L360N	360~530	460~760
		X56N or L390N	390~545	490~760
		X60N or L415N	415~565	520~760
		X65N or L450N	425~566	525~760
		X70 or L480	484~565	565~768
		X80	552~690	621~827

Product Level	Steel Grade	Chemical Composition, %
		C	Mn	P	S	And	IN	Nb	Of	CEpcm
PSL 1	B or L245	≤0.28	≤1.20	≤0.030	≤0.030	-	-	-	-	-
	x42 or L290	≤0.28	≤1.30	≤0.030	≤0.030	-	-	-	-	-
	X46 or L320	≤0.28	≤1.40	≤0.030	≤0.030	-	-	-	-	-
	X52 or L360	≤0.28	≤1.40	≤0.030	≤0.030	-	-	-	-	-
	X56 or L390	≤0.28	≤1.40	≤0.030	≤0.030	-	-	-	-	-
	X60 or L415	≤0.28	≤1.40	≤0.030	≤0.030	-	-	-	-	-
	X70	≤0.28	≤1.40	≤0.030	≤0.030	-	-	-	-	-
PSL 2	BR or L245R	≤0.24	≤1.20	≤0.025	≤0.015	≤0.40	c	c	≤0.04	≤0.25
	X42R or L290R	≤0.24	≤1.20	≤0.025	≤0.015	≤0.40	≤0.06	≤0.05	≤0.04	≤0.25
	BN or L245N	≤0.24	≤1.20	≤0.025	≤0.015	≤0.40	c	c	≤0.04	≤0.25
	X42N or L290N	≤0.24	≤1.30	≤0.025	≤0.015	≤0.40	≤0.06	≤0.05	≤0.04	≤0.25
	X46N or L320N	≤0.24	≤1.40	≤0.025	≤0.015	≤0.40	≤0.07	≤0.05	≤0.04	≤0.25
	X52N or L360N	≤0.24	≤1.40	≤0.025	≤0.015	≤0.45	≤0.10	≤0.05	≤0.04	≤0.25
	X56N or L390N	≤0.24	≤1.40	≤0.025	≤0.015	≤0.45	≤0.10	≤0.05	≤0.04	≤0.25
	X60N or L415N	≤0.24	≤1.40	≤0.025	≤0.015	≤0.45	≤0.10	≤0.05	≤0.04	-
	X65N or L450N	≤0.24	≤1.40	≤0.025	≤0.015	≤0.45	≤0.10	≤0.05	≤0.04	-
	X70N	≤0.24	≤1.40	≤0.025	≤0.015	≤0.45	≤0.10	≤0.05	≤0.04	-
	X80	≤0.24	≤1.40	≤0.025	≤0.015	≤0.45	≤0.10	≤0.05	≤0.04

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