8620/1.6523/20CrNiMoA/SNCM220 alloy steel

8620 carbon steel can also be used as high tensile steel (uncarburized), which can be used for a variety of applications needing great tensile strength and adequate toughness when properly hardened and tempered. It’s known to have good internal strength, but the strength on the outside is even greater.

Chemical Composition(%)

Standard	Grade	C	Si	Mn	P	S	Cr	Ni
ASTM A29	8620	0.18-0.23	0.15-0.35	0.7-0.9	≤ 0.035	≤ 0.04	0.4-0.6	0.4-0.7
EN 10084	1.6523	0.17-0.23	≤ 0.04	0.65-0.95	≤ 0.025	≤ 0.035	0.35-0.70	0.4-0.7
	20NiCrMo2-2
JIS G4103	SNCM220	0.17-0.23	0.15-0.35	0.6-0.9	≤ 0.03	≤ 0.03	0.4-0.65	0.4-0.7
BS 970	805M20	0.17-0.23	0.1-0.4	0.6-0.95	≤ 0.04	≤ 0.05	0.35-0.65	0.35-0.75
GB 3077	20CrNiMoA	0.17-0.23	0.17-0.37	0.6-0.95	≤ 0.035	≤ 0.035	0.4-0.7	0.35-0.75

Application

SAE 8620 is suited for applications which require a combination of toughness and wear resistance. it is commonly used in the engineering and automitive industries for toolholders and other such components.Typical application:Arbors, pinions, bushes, camshafts, kingpins,ratchets, gears, splined shafts etc.

Mechanical Property

Section Size	11 mm	30 mm	63 mm
Tensile Strength Mpa	980-1270	780-1080	690-930
Yield Strength Mpa	≥785	≥590	≥490
Elongation %	≥9	≥10	≥11
Impact Charpy J	≥41	≥41	≥41
Hardness HB	290-375	235-320	205-275
Hardness HRC	31-41	23-35	16-29

Heat Treatment Conditions

Forging	925℃-1230℃.
Normalizing	900℃-925℃.
Annealing	820℃-850℃.
Case Hardening	780oC – 820oC.
Tempering	150oC – 200oC .