Carbon Steel for Machine Structural Use

Content:

1. End applications

2. Chemical Composition

3. Mechanical properties(hot rolled)

4. Mechanical properties(cold rolled)

Chemical Composition

JIS	SAE	Nisshin Standard	Chemical Composition(%)
			C	Si	Mn	P	S
S09CK			0.07~0.12	0.10~0.35	0.30~0.60	0.025max	0.025max
S10C			0.08~0.13	0.15~0.35	0.30~0.60	0.030max	0.035max
S12C			0.10~0.15	0.15~0.35	0.30~0.60	0.030max	0.035max
		N15CK	0.10~0.15	0.15~0.35	0.30~0.60	0.025max	0.025max
S15CK			0.13~0.18	0.15~0.35	0.30~0.60	0.025max	0.025max
	SAE1015		0.13~0.18	0.15~0.30	0.30~0.60	0.040max	0.050max
S15C			0.13~0.18	0.15~0.35	0.30~0.60	0.030max	0.035max
	SAE1018		0.15~0.20	0.15~0.30	0.60~0.90	0.030max	0.050max
	SAE1019		0.15~0.20	0.15~0.30	0.70~1.00	0.030max	0.050max
S17C			0.15~0.20	0.15~0.35	0.30~0.60	0.030max	0.035max
	SAE1020		0.18~0.23	0.15~0.30	0.30~0.60	0.030max	0.050max
	SAE1022		0.18~0.23	0.15~0.30	0.70~1.00	0.030max	0.050max
S20C			0.18~0.23	0.15~0.35	0.30~0.60	0.030max	0.035max
S20CK			0.18~0.23	0.15~0.35	0.30~0.60	0.025max	0.025max
	SAE1023		0.20~0.25	0.15~0.30	0.30~0.60	0.040max	0.050max
S22C			0.20~0.25	0.15~0.35	0.30~0.60	0.030max	0.035max
S25C			0.22~0.28	0.15~0.35	0.30~0.60	0.030max	0.035max
S28C			0.25~0.31	0.15~0.35	0.60~0.90	0.030max	0.035max
S30C			0.27~0.33	0.15~0.35	0.60~0.90	0.030max	0.035max
	SAE1030		0.28~0.34	0.15~0.30	0.60~0.90	0.030max	0.050max
S33C			0.30~0.36	0.15~0.35	0.60~0.90	0.030max	0.035max
	SAE1035		0.32~0.38	0.15~0.30	0.60~0.90	0.030max	0.050max
S35C			0.32~0.38	0.15~0.35	0.60~0.90	0.030max	0.035max
S38C			0.35~0.41	0.15~0.35	0.60~0.90	0.030max	0.035max
	SAE1040		0.37~0.44	0.15~0.30	0.60~0.90	0.030max	0.050max
S40C			0.37~0.43	0.15~0.35	0.60~0.90	0.030max	0.035max
S43C			0.40~0.46	0.15~0.35	0.60~0.90	0.030max	0.035max
S45C			0.42~0.48	0.15~0.35	0.60~0.90	0.030max	0.035max
	SAE1045		0.43~0.50	0.15~0.30	0.60~0.90	0.030max	0.050max

JIS	SAE	Nisshin Standard	Chemical Composition(%)
			C	Si	Mn	P	S
		N45B	0.43~0.50	0.15~0.30	0.40~0.65	0.030max	0.035max
		NCL1	0.45~050	0.15~0.30	0.60~0.90	0.035max	0.040max
S48C			0.45~0.51	0.15~0.35	0.60~0.90	0.030max	0.035max
S50C			0.47~0.53	0.15~0.35	0.60~0.90	0.030max	0.035max
		N50S	0.45~0.55	0.15~0.35	0.60~0.90	0.030max	0.035max
	SAE1050		0.48~0.55	0.15~0.30	0.60~0.90	0.030max	0.050max
		N50B	0.48~0.55	0.15~0.30	0.40~0.65	0.030max	0.035max
S53C			0.50~0.56	0.15~0.35	0.60~0.90	0.030max	0.035max
		NU52	0.50~0.58	0.15~0.35	0.60~0.90	0.030max	0.035max
S55C			0.52~0.58	0.15~0.35	0.60~0.90	0.030max	0.035max
		N55D	0.52~0.58	0.10max	0.60~0.90	0.030max	0.035max
	SAE1055		0.50~0.60	0.15~0.30	0.60~0.90	0.030max	0.050max
S58C			0.55~0.61	0.15~0.35	0.60~0.90	0.030max	0.035max
	SAE1060		0.55~0.65	0.15~0.30	0.60~0.90	0.030max	0.050max
		N60C	0.55~0.65	0.15~0.30	0.60~0.90	0.030max	0.035max
	SAE1064		0.60~0.70	0.15~0.30	0.50~0.80	0.030max	0.050max
	SAE1065		0.60~0.70	0.15~0.30	0.60~0.90	0.030max	0.050max
		N63C	0.60~0.65	0.15~0.30	0.70~0.90	0.030max	0.035max
		N65C	0.60~0.70	0.15~0.30	0.60~0.90	0.030max	0.035max
	SAE1566		0.60~0.71	0.15~0.30	0.85~1.15	0.030max	0.050max
		N66C	0.62~0.70	0.17~0.37	0.90~1.20	0.030max	0.035max
		N70C	0.65~0.75	0.15~0.30	0.60~0.90	0.030max	0.035max
		NK11	0.65~0.75	0.35max	0.50~0.80	0.030max	0.030max
	SAE1070		0.65~0.75	0.15~0.30	0.60~0.90	0.030max	0.050max
	SAE1074		0.70~0.80	0.15~0.30	0.50~0.80	0.030max	0.050max
		N75C	0.70~0.80	0.15~0.30	0.60~0.90	0.030max	0.035max
	SAE1075		0.70~0.80	0.15~0.30	0.40~0.70	0.030max	0.050max
	SAE1080		0.75~0.88	0.15~0.30	0.60~0.90	0.030max	0.050max
		N85C	0.80~0.90	0.15~0.30	0.70~1.00	0.030max	0.035max
	SAE1085		0.80~0.93	0.15~0.30	0.70~1.00	0.030max	0.050max
	SAE1090		0.85~0.98	0.15~0.30	0.60~0.90	0.030max	0.050max

Mechanical properties(hot rolled)

	Type of steel	Hot-rolled hardness (HRB)	Hardening				Tempering			Annealed hardness (HRB)
			Water quenched 3.15mm max		Oil quenched below 3.15mm		Temperature(℃)	Hardness(HRC)
			Temperature (℃)	Hardness (HRC)	Temperature (℃)	Hardness (HRC)		Water quenched	Oil quenched
J I S	S10C	76 max	-	-	-	-	-	-	-	-
	S12C	81 max	-	-	-	-	-	-	-	-
	S15C	83 max	-	-	-	-	-	-	-	-
	S17C	85 max	-	-	-	-	-	-	-	-
	S20C	86 max	-	-	-	-	-	-	-	-
	S22C	88 max	-	-	-	-	-	-	-	-
	S25C	90 max	-	-	-	-	-	-	-	-
	S28C	91 max	-	-	-	-	-	-	-	-
	S30C	93 max	850~900	46 min	-	-	150~200 air cooled	42 min	-	85 max
	S33C	97 max	840~890	46 min	-	-	150~200 air cooled	42 min	-	85 max
	S35C	98 max	840~890	46 min	-	-	150~200 air cooled	43 min	-	88 max
	S38C	99 max	830~880	46 min	-	-	150~200 air cooled	43 min	-	88 max
	S40C	99 max	830~880	53 min	830~880	51 min	150~200 air cooled	47 min	45 min	90 max
	S43C	100 max	820~870	53 min	830~880	51 min	150~200 air cooled	47 min	45 min	90 max
	S45C	101 max	820~870	53 min	830~880	51 min	150~200 air cooled	50 min	45 min	91 max
	S48C	102 max	810~860	55 min	810~860	53 min	150~200 air cooled	50 min	48 min	91 max
	S50C	104 max	810~860	55 min	810~860	53 min	150~200 air cooled	50 min	48 min	92 max
	S53C	106 max	800~850	55 min	810~860	53 min	150~200 air cooled	50 min	48 min	92 max
	S55C	107 max	800~850	55 min	810~860	53 min	150~200 air cooled	52 min	50 min	93 max
	S58C	108 max	800~850	58 min	800~850	56 min	150~200 air cooled	52 min	50 min	93 max
	S09CK (S9CK)	76 max	-	-	-	-	-	-	-	-
	S15CK	83 max	-	-	-	-	-	-	-	-
	S20CK	86 max	-	-	-	-	-	-	-	-

	Type of steel	Hot-rolled hardness	Hardning				Tempering			Annealed hardness (HRB)
			Water quenched 3.15mm max		Oil quenched below3.15mm		Temperature(℃)	Hardness(HRC)
			Temperature (℃)	Hardness (HRC)	Temperature (℃)	Hardness (HRC)		Water quenched	Oil quenched
S A E	SAE1015	HRB85 max	-	-	-	-	-	-	-	-
	SAE1018	HRB90 max	-	-	-	-	-	-	-	-
	SAE1019	HRB90 max	-	-	-	-	-	-	-	-
	SAE1020	HRB86 max	-	-	-	-	-	-	-	-
	SAE1022	HRB93 max	-	-	-	-	-	-	-	-
	SAE1023	HRB88 max	-	-	-	-	-	-	-	-
	SAE1030	HRB98 max	850~900	45 min	-	-	150~200 air cooled	42 min	-	86 max
	SAE1035	HRB99 max	850~900	46 min	-	-	150~200 air cooled	43 min	-	88 max
	SAE1040	HRB100 max	820~870	53 min	830~880	51 min	150~200 air cooled	47 min	45 min	90 max
	SAE1045	HRB104 max	820~870	56 min	830~880	54 min	150~200 air cooled	47 min	45 min	91 max
	SAE1050	HRB107 max	810~860	56 min	810~860	54 min	150~200 air cooled	50 min	48 min	92 max
	SAE1055	HRB108 max	800~850	56 min	810~860	54 min	150~200 air cooled	50 min	48 min	93 max
	SAE1060	HRC34 max	760~820	59 min	790~850	57 min	150~200 air cooled	54 min	52 min	94 max
	SAE1064	HRC35 max	760~820	59 min	780~840	57 min	150~200 air cooled	54 min	52 min	94 max
	SAE1065	HRC35 max	760~820	59 min	780~840	57 min	150~200 air cooled	54 min	52 min	94 max
	SAE1566	HRC38 max	790~850	59 min	780~840	57 min	150~200 air cooled	54 min	52 min	97 max
	SAE1070	HRC37 max	760~820	59 min	780~840	57 min	150~200 air cooled	56 min	54 min	96 max
	SAE1074	HRC38 max	760~820	59 min	780~840	57 min	150~200 air cooled	56 min	54 min	96 max
	SAE1075	HRC38 max	760~820	59 min	780~840	57 min	150~200 air cooled	56 min	54 min	96 max
	SAE1080	HRC40 max	760~820	62 min	780~840	60 min	150~200 air cooled	58 min	58 min	96 max
	SAE1085	HRC42 max	760~820	62 min	770~830	60 min	150~200 air cooled	59 min	59 min	97 max
	SAE1090	HRC43 max	760~820	62 min	770~830	60 min	150~200 air cooled	59 min	59 min	97 max

	Type of steel	Hot-rolled hardness	Hardening				Tempering			Annealed hardness (HRB)
			Water quenched 3.15mm max		Oil quenched below3.15mm		Temperature (℃)	Hardness(HRC)
			Temperature (℃)	Hardness (HRC)	Temperature (℃)	Hardness (HRC)		Water quenched	Oil quenched
Nisshin Standard	N45B	HRB102 max	820~870	53 min	830~880	51 min	150~200 air cooled	50 min	45 min	91 max
	N50B	HRB108 max	800~850	56 min	810~860	54 min	150~200 air cooled	54 min	52 min	92 max
	N60C	HRC 34 max	760~820	58 min	790~820	56 min	150~200 air cooled	54 min	52 min	94 max
	N63C	HRC 34 max	760~820	58 min	780~840	56 min	150~200 air cooled	54 min	52 min	94 max
	N65C	HRC 35 max	760~820	58 min	780~840	56 min	150~200 air cooled	54 min	52 min	94 max
	N66C	HRC 38 max	760~820	58 min	780~840	56 min	150~200 air cooled	54 min	52 min	97 max
	N70C	HRC 37 max	760~820	58 min	780~840	56 min	150~200 air cooled	54 min	52 min	96 max
	N75C	HRC 38 max	760~820	58 min	780~840	56 min	150~200 air cooled	54 min	52 min	96 max
	N85C	HRC 42 max	760~820	61 min	770~830	59 min	150~200 air cooled	59 min	58 min	97 max
	N15CK	HRB 81 max	-	-	-	-	-	-	-	-
	NCL1	HRB102 max	800~850	56 min	810~860	54 min	550~650 air cooled	14 min	14 min	91 max
	NU52	HRB105 max	800~850	56 min	810~860	54 min	150~200 air cooled	50 min	48 min	92 max
	N50S	HRB108 max	800~850	56 min	810~860	54 min	150~200 air cooled	54 min	52 min	91 max
	NK11	HRC 37 max	760~820	58 min	780~840	56 min	150~200 air cooled	56 min	54 min	94 max
	N55D	HRB107 max	810~850	55 min	820~860	53 min	150~200 air cooled	52 min	50 min	93 max

Mechanical properties(cold rolled)

Type of steel		Annealing Hardness		Deep-Drawing Hardness
		Standard	Special
		HV	HV	HV
J I S	S15C	≦140	≦130	150~180
	S20C	≦150	≦140	150~180
	S25C	≦150	≦140	150~180
	S30C	≦150	≦140	150~180
	S35C	≦150	≦140	160~240
	S40C	≦150	≦140	160~240
	S45C	≦160	≦150	170~240
	S50C	≦160	≦150	180~260
	S55C	≦170	≦160	180~260
	S60C	≦170	≦160	180~280
	S65C	≦170	≦160	180~280
	S70C	≦180	≦170	180~280
	S75C	≦180	≦170	180~280
S A E	SAE1050	≦160	≦150	180~260
	SAE1055	≦170	≦160	180~260
	SAE1060	≦170	≦160	180~280
	SAE1070	≦180	≦170	180~280
	SAE1080	≦180	≦170	180~280
Nisshin Standard	N63C	≦170	≦160	180~280
	N70C	≦180	≦170	180~280
	N55D	≦160	≦150	-

Source: tenhiko.com