30CrNiMo8 Alloy Steel | DIN 1.6580-EN10250

30CrNiMo8|DIN 1.6580 is a heat treatable steel which has at least 1.8%Cr,1.8%Ni,and 0.3%M0 as strengthening alloy elements.It is usually supplied with quenched and tempered condition with a typical tensile strength of 1100 -1300 N/mm². 30CrNiMo8 steel is used for automotive and general components which requires high demands on strength and toughness and good hardenability.It is especially suitable for heavy duty parts in the aviation, automotive and military industries.

1.Supply Form & Size & Tolerance

Hot rolled bar:Φ6-Φ130mm,Length:3000-10000mm

Hot Forged round bar:Φ130-Φ1000mm,Length:3000-10000mm

Flat bar/Blcoks:Thickness :120-800mm xWidth:120-1500mm,Length:2000-6000mm

Surface Finish	Tolerance
Black For Forged condition	(0，+5mm)
Black For Rolled condition	(0，+1mm)
Rough Turned	(0，+3mm)
Grinding	Best h9
Polished	Best h11
Peeled	Best H11
Cold Drawn	Best H11

2.Chemical Composition

Standard	Grade	C	Si	Mn	P	S	Cr	Ni	Mo
EN10083	30CrNiMo8/1.6580	0.26-0.34	≤0.4	0.5-0.8	≤0.025	≤0.035	1.8-2.2	1.8-2.2	0.3-0.5
EN10250	30CrNiMo8/1.6580	0.26-0.34	≤0.4	0.3-0.6	≤0.035	≤0.035	1.8-2.2	1.8-2.2	0.3-0.5

3.Relevant Standards

USA	UK	France	Italy
A320L43	823M30	30CND8	30CrNiMo8

4. Mechanical Property

Diameter d mm	≤ 16	16-40	40-100	100-160	160-250
Yield Strength Mpa	≥900	≥800	≥700	≥600	≥550
Tensile Strength Mpa	1100-1300	1000-1200	900-1100	800-950	750-900
Elongation, %	≥10	≥11	≥12	≥13	≥14
Reduction of area ,%	≥45	≥50	≥55	≥60	≥60
impact,J	≥35	≥40	≥45	≥45	≥45
Hardness,HB	331-380	298-359	271-331	240-286	225-271

5.Forging

Heat the temperature between 1050℃-1150℃,hold suitable time for the steel to be thoroughly heated.Reheat the steel once temperature below 850°C. 30CrNiMo8 steel has good forging characteristics,but crack is easily occured when improper cooling way after forged,so it should be cooled as slowly as possible in the furnace or in sand after forged.

6.Heat Treatment

Normalizing:870℃-880℃,Cool in air
Soft Annealing:650℃-700℃,Cooling 10℃ per hour in furnace,max. 248 HB
Stress Relieving:50°C under the temperature of tempering
Hardening:830 – 860°C,oil or polymer,840-850°C,water
Tempering:540°C – 660°C, cool in still air

7.Jominy Test-Hardenability

HRC-mm	Type	1.5	3	6	7	9	11	13	15	20	25	30	35	40	45	50
MIN	+H	48	48	48	48	47	47	47	46	46	45	45	44	44	43	43
MAX	+H	56	56	56	56	55	55	55	55	55	54	54	54	54	54	54
MIN	+HH	51	51	51	51	50	50	50	49	49	48	48	47	47	47	47
MAX	+HH	56	56	56	56	55	55	55	55	55	54	54	54	54	54	54
MIN	+HL	48	48	48	48	47	47	47	46	46	45	45	44	44	43	43
MAX	+HL	53	53	53	53	52	52	52	52	52	51	51	51	51	50	50