Chemical composition

C(％)	0.17～0.23	Si(％)	0.17～0.37	Mn(％)	0.60～0.95	P(％)	≤0.035
S(％)	≤0.035	Cr(％)	0.40～0.70	Mo(％)	0.20～0.30	Ni(％)	0.35～0.75

Equivalent Of 5160 alloy Spring Steel

USA	Germany	China	Japan	France	England	Italy	Poland	ISO	Austria	Sweden	Spain
ASTM/AISI/UNS/SAE	DIN,WNr	GB	GB	AFNOR	BS	UNI	PN	ISO	ONORM	SS	UNE
8620 / G86200	21NiCrMo2/ 1.6523	20CrNiMo	SNCM220	20NCD2	805M20			20NiCrMo2

Heat treatment Related

Annealing of 20CrNiMo Alloy structural steel

Slowly heated to 850 ℃ and allow enough times, let the steel to be thoroughly heated, Then cool slowly in the furnace. The 20CrNiMo alloy steel will get MAX 250 HB （Brinell hardness）.

Hardening of 20CrNiMo Alloy structural steel

Heated slowly to 880-920°C, Then after adequate soaking at this temperature quench in oil. Temper as soon as tools reach room temperature.

Mechanical Properties

The mechanical properties of annealed GB 20CrNiMo alloy steel are outlined in the table below

Tensile	Yield	Bulk modulus	Shear modulus	Poisson’s ratio	Izod Impact
KSI	KSI	KSI	KSI		ft.lb
76900	55800	20300	11600	0.27-0.30	84.8

Applications

GB 20CrNiMo steel is widely used for a variety of applications in the used in the automotive and engineering industries for toolholders and other such components. Typical applications such as valve bodies, pumps and fittings, Shaft, the high load of wheel, bolts, double-headed bolts, gears, etc

20CrNi2Mo Structural Steel