30CrNiMo8 / 1.6580 Steel

30CrNiMo8 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.

30CrNiMo8 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

30CrNiMo8 Chemical Composition

Grade	C	Mn	P	S	Si	Ni	Cr	Mo
30CrNiMo8/1.6580	0.26-0.34	0.50-0.80	≤ 0.025	≤ 0.035	≤ 0.04	1.8-2.2	1.8-2.2	0.3-0.5

30CrNiMo8 Relevant Standards

USA	UK	France	Italy
A320L43	823M30	30NCD8	30CrNiMo8

30CrNiMo8 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

30CrNiMo8 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.

30CrNiMo8 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

30CrNiMo8 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		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		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		53	53	53	53	52	52	52	52	52	51	51	51	51	50	50

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