Heat Treatment Process Table for Machining: Common Materials and Techniques

The table below presents the heat treatment information for various types of steels commonly used in machining, such as stainless steel, carbon structural steel, carbon tool steel, alloy carburized steel, die steel, quenched and tempered steel, spring steel, nitrided steel, alloy cutting tool steel, and bearing steel.

The data includes details on annealing temperature, quenching temperature, martensite point, and tempering temperature.

Heat treatment chart for stainless steel

Steel type			Stainless steel
Steel grade			1Cr15	2Cr13	3Cr13	1Cr18Ni9Ti
Steel grade					4Cr13
Annealing temperature			780 850	780 850	780 850	820
Quenching temperature			1020	1050	1050	1050
Martensite point			350	350	240 270
Tempering temperature ℃	150	Hardness after tempering HRC				58
	200		41	47	52	57
	250					56
	300		40	46	51	55
	350					54
	400		39	44	50	54
	450					53
	500		38	42	49	50
	550		31	37	43	45
	600		24	28	34	40
	650		22	24	30	38

Heat treatment chart for carbon steel

Steel type			Carbon structural steel			Carbon tool steel
Steel grade			35	45	50	T8	T12
Steel grade				40		T7	T10
Annealing temperature			880 positive	860 positive	840 positive	760	770
Quenching temperature			850	840	830	780	780
Martensite point			350	340	320	230	210
Tempering temperature ℃	150	Hardness after tempering HRC	52	57	58	62	64
	200		50	56	57	60	62
	250		48	54	54	57	60
	300		46	48	51	55	57
	350		43	45	46	51	53
	400		39	41	43	47	49
	450		34	36	38	42	44
	500		30	32	34	38	39
	550		26	28	30	34	35
	600		22	24	25	29	31
	650		18	20	21	25	28

Heat treatment chart for alloy carbon steel

Steel type			Alloy carbon steel
Steel grade			20Mn2TiB	18CrNiw	20Cr	20Cr	25CrNiW
Steel grade			18CrMnTi	205iMnV1			30CrMnMoTi
Annealing temperature			900 positive	900 positive	900 positive	940 positive	850
Quenching temperature			860	860	880	800	850
Martensite point			360	310	380		300
Tempering temperature ℃	150	Hardness after tempering HRC	44	45	47	63	50
	200		42	44	45	59	48
	250		41	43	42	56	45
	300		40	42	40	54	43
	350		39	41	38	53	40
	400		39	40		51	38
	450		38	39		49	36
	500		36	37		46	34
	550		32	33			30
	600		28	30			27
	650		25	26			24

Heat treatment chart for die steel

Steel type			Die steel
Steel grade			Cr12 type	3Cr2W8	5CrMnMo	8Cr3	Cr9si2
Steel grade					5CrNiMo	7Cr3
Annealing temperature			860	820	850	830	800
Quenching temperature			1000	1080	850	870	1070
Martensite point			220	360	220	220
Tempering temperature ℃	150	Hardness after tempering HRC	63	52	59	62	62
	200		61	49	58	60	61
	250		60	48	56	59	60
	300		59	48	53	58	59
	350		58	47	51	56	58
	400		58	46	48	53	54
	450		57	44	45	50	50
	500		56	45	42	47	47
	550		53	48	39	45	43
	600		50	45	35	41	39

Heat treatment chart for quenched and tempered steel

Steel type			Quenched and tempered steel
Steel grade			30CrNi3	35CrMnSi	37CrNiB	40Cr	45Cr
Steel grade			30CrMnNi2MoV	30CrMnSi	35CrMo	50B	45Mn2
Annealing temperature			820	860	820	840	840
Quenching temperature			860	880	860	850	850
Martensite point			300	360	270	320	310
Tempering temperature ℃	150	Hardness after tempering HRC	51	54	51	54	56
	200		50	53	50	51	54
	250		48	51	48	48	53
	300		46	48	46	47	51
	350		44	46	43	46	49
	400		42	44	41	43	48
	450		39	41	39	42	46
	500		35	38	37	38	44
	550		32	35	34	34	40
	600		27	28	29	31	35
	650		25	27	25	25	28

Heat treatment chart for spring steel & nitrided steel

Steel type			Spring steel			Nitrided steel
Steel grade			50CrV	60Si2Mn	65Mn	38CrAl
Steel grade				55Si2Mn	60Mn	38CrMoAl
annealing temperature			860	810	810	950 positive
quenching temperature			860	860	810	940
Martensite point			300	300	270	360
Tempering temperature ℃	150	Hardness after tempering HRC	57	62	61	57
	200		55	59	58	55
	250		53	57	56	53
	300		51	55	54	51
	350		48	51	50	48
	400		46	48	47	46
	450		43	45	43	43
	500		40	41	38	40
	550		36	37	34	36
	600		32	33	30	34
	650		30	31	26	30

Heat treatment chart for alloy cutting tool steel & bearing steel

Steel type			Alloy cutting tool steel			Bearing steel
Steel grade			9Crsi	CrMn	SiMn	GCr15	GCr15SiMn
Steel grade				CrWMn	CrW5	Cr20
Annealing temperature			800	790	800	790	790
Quenching temperature			860	840	850	850	830
Martensite point			170	250	240	240	200
Tempering temperature ℃	150	Hardness after tempering HRC	64	64	65	63	64
	200		63	62	63	61	63
	250		61	60	61	59	62
	300		59	58	59	55	59
	350		56	55	56	52	53
	400		54	53	54	49	51
	450		51	50	51	45
	500		48	47	48	41
	550		44	43	44	36
	600		40	39	40	28
	650		36	35	36	26

Heat treatment chart for spring steel

Steel type name			Spring steel			Nitrided steel
Steel grade			50CrV	60Si2Mn	65Mn	38CrAl
Steel grade				55Si2Mn	60Mn	38CrMoAl
Annealing temperature			860	810	810	950 positive
Quenching temperature			860	860	810	940
Martensite point			300	300	270	360
Tempering temperature ℃	150	Hardness after tempering HRC	57	62	61	57
	200		55	59	58	55
	250		53	57	56	53
	300		51	55	54	51
	350		48	51	50	48
	400		46	48	47	46
	450		43	45	43	43
	500		40	41	38	40
	550		36	37	34	36
	600		32	33	30	34
	650		30	31	26	30

Heat Treatment Process Table for Machining: Common Materials and Techniques

Heat treatment chart for stainless steel

Heat treatment chart for carbon steel

Heat treatment chart for alloy carbon steel

Heat treatment chart for die steel

Heat treatment chart for quenched and tempered steel

Heat treatment chart for spring steel & nitrided steel

Heat treatment chart for alloy cutting tool steel & bearing steel

Heat treatment chart for spring steel

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