CASE HARDENING STEELS

CASE HARDENING STEELS

Case hardening steels are ones used in manufacturing of parts desired to be hard and resistant to wear on the surface yet softer and saturated in the core, between 0,10-0,20 C% ratio, as well as resistant to varying and pulsed forces.

CHEMICAL COMPOSITION
Material No	Symbol	AISI-SAE	C	Si	Mn	P max	S max	Cr	Mo	Ni
1.0301	C 10	1010	0,07 0,13	0,15 0,35	0,30 0,60	0,045	0,045
1.0401	C 15	1015	0,12 0,18	0,15 0,35	0,30 0,60	0,045	0,045
1.7015	15Cr3	5015	0,12 0,18	0,15 0,40	0,40 0,60	0,035	0,035	0,40 0,70
1.7131	16MnCr5	5120	0,14 0,19	≤0,40	1,00 1,30	0,035	0,035	0,80 1,10
1.7147	20MnCr5	5120	0,17 0,22	≤0,41	1,10 1,40	0,03	0,035	1,00 1,30
1.7325	25MoCr4		0,23 0,29	0,15 0,40	0,40 0,60	0,035	0,035	0,40 0,60	0,40 0,50
1.5919	15CrNi6		0,12 0,17	0,15 0,40	0,40 0,60	0,035	0,035	1,40 1,70		1,40 1,70
1.5920	18CrNi8		0,15 0,20	0,15 0,40	0,40 0,60	0,035	0,035	1,80 2,10		1,80 2,10
1.6587	17CrNiMo6		0,14 0,19	0,15 0,40	0,40 0,60	0,035	0,035	1,50 1,80	0,25 0,35	1,40 1,70
1.6523	21NiCrMo2	8620	0,18 0,23	0,20 0,35	0,70 0,90	0,04	0,04	0,40 0,60	0,15 0,25	0,40 0,70

FIELDS OF USE
Material No	Symbol	AISI-SAE
1.0301	C 10	1010	Medium duty building and machine parts with low core resistance
1.0401	C 15	1015	Lever arm, bearing, reel, gearwheel, gauge etc building and machine parts
1.7015	15Cr3	5015	reel seat, gauge, piston pin, differential part, gearwheel, ball screw
1.7131	16MnCr5	5120	gearwheel, transmission component, loam, pin, cardan bearing
1.7147	20MnCr5	5120	transmission component, gearwheel, plate and conic gear, pin, bearing, thick-section loam
1.7325	25MoCr4		all kinds of transmission components, axle, loam, pin, bearing, diverter parts
1.5919	15CrNi6		Gearwheel chain wheel, loam in machinery and automobiles
1.5920	18CrNi8		Thick-section gearwheel, plate geared, drive part, etc. very heavy duty transmission components parts
1.6587	17CrNiMo6		very heavy duty transmission component parts, thick-section gears
1.6523	21NiCrMo2	8620	Very heavy duty, gearwheel, switch shell, pin, loam in machinery and automobiles

MECHANICAL PARTICULARITIES OF CASE HARDENING STEELS

			In material procurement				After case hardening and hardening
			Yt	Bç	Fp	Q11 mm	Yielding point (Re)		Tensile strength (Rm)			Rupture elongation (A)			Constriction (Z)			Notch impact (DVM)
							Q30 mm	Q63 mm	Q11 mm	Q30 mm	Q63 mm	Q11 mm	Q30 mm	Q63 mm	Q11 mm	Q30 mm	Q63 mm	Q11 mm	Q30 mm
Material No	Symbol	AISI-SAE					≥Mpa		Mpa			≥ %			≥ %			≥ J
1.0301	C 10	1010	131		90 126	390	295		640 780	490 640		13	16		35	45		69	69
1.0401	C 15	1015	146		103 140	440	335		740 880	590 780		12	14		35	45		48	48
1.7015	15Cr3	5015	174	126 174	118 160	510	440		780 1030	690 880		10	11		35	40		41	41
1.7131	16MnCr5	5120	207	156 207	140 187	635	590	440	880 1180	780 1080	640 930	9	10	11	35	40	40	34	34
1.7147	20MnCr5	5120	217	170 217	152 201	735	685	540	1080 1370	980 1270	780 1080	7	8	10	30	35	35	34	34
1.7325	25MoCr4		217	170 217	152 201	735	685	540	1080 1370	980 1270	780 1080	7	8		30	35	35	34	34
1.5919	15CrNi6		217	170 217	152 201	685	635	540	960 1270	880 1180	780 1060	8	9	10	35	40	40	41	41
1.5920	18CrNi8		235	187 235	170 217	835	785	685	1230 1470	1180 1420	1080 1320	7	8	8	30	35	35	41	41
1.6587	17CrNiMo6		229	179 229	159 207	835	785	685	1180 1420	1080 1320	980 1270	7	8	8	30	35	35	41	41
1.6523	21NiCrMo2	8620	210	165 210	150 195	785	590	490	980 1270	780 1080	690 930	9	10	11	35	40	40	41	41

HEAT TREATMENT CONDITIONS OF CASE HARDENING STEELS

			hot working temperature	soft annealing temperature	annealing temperature for certain endurance value before case hardening	annealing temperature for a certain structure case	case hardening type of process			case hardening temperature	Cooling environment after case hardening						Core hardening temperature	Intermediate annealing temperature	Case hardening
Material No	Symbol	AISI-SAE	ᵒC	ᵒC	ᵒC	ᵒC	Direct hard.	Simple hardening	Double hardening	ᵒC	water	oil	hot float bath	float bath	Case hardening box	air	ᵒC	ᵒC	ᵒC	water	oil	hot bath
1.0301	C 10	1010	1150 850	670 700	850 950	900 1000	*	*	-	900 950	*	-	*	-	*	*	880 920	-	-	-	-	-
1.0401	C 15	1015	1150 850	670 700	850 950	900 1000	*	*	-	900 950	*	-	*	-	*	*	880 920	-	-	-	-	-
1.7015	15Cr3	5015	1150 850	670 700	850 950	900 1000	*	*	-	900 950	*	*	*	-	*	*	870 900	-	-	-	-	-
1.7131	16MnCr5	5120	1150 850	670 700	850 950	900 1000	*	*	*	900 950	-	*	*	*	*	*	850 880	-	810 840	*	*	*
1.7147	20MnCr5	5120	1150 850	670 700	850 950	900 1000	*	*	*	900 950	-	*	*	*	*	*	850 880	-	810 840	*	*	*
1.7325	25MoCr4		1150 850	670 700	850 950	900 1000	*	-	-	900 950	-	*	*	-	-	-	890 920	-	-	-	-	-
1.5919	15CrNi6		1150 850	670 700	850 950	900 1000	-	*	*	900 950	-	*	*	*	*	*	840 870	630 650	800 830	*	*	*
1.5920	18CrNi8		1150 850	670 700	850 950	900 1000	-	*	*	900 950	-	*	*	*	*	*	840 870	630 650	800 830	*	*	*
1.6587	17CrNiMo6		1150 850	670 700	850 950	900 1000	-	*	*	900 950	-	*	*	-	*	*	840 870	630 650	800 830	*	*	*
1.6523	21NiCrMo2	8620	1150 850	670 700	850 950	900 1000	*	*	-	900 950	-	*	*	*	*	*	840 870	630 650	800 830	*	*	*