20MnCr5 is The grades implied from the Germany grades,the equivalent of china 20CrMn,caburized steel

alloy structural steel 20MnCr5

features and application

The grades implied from the Germany grades,the equivalent of china’s 20CrMn,caburized steel or can be used as the tempered steel.It has relatively good hardenability, small steel distortion,good toughness in the low temperature,cutting performance,though its welding ability isn’t too good.So the kind of steel can be used as the carburized parts and tempering parts of huge sectional area and high loading,such as the gear,shafts,worm,bushing,friction wheel and so on.

chemical composition

substance	C	SI	MN	S	P	CR
	0.17~0.22	≤0.25	1.10~1.50	0.010~0.035	≤0.035	1.00~1.30

mechanical properties

tensible strength σb (MPa)  1482

 offset yield strengthσ0.2 (MPa)  1232

elongation  δ5 (%)   13

 reduction of area ψ (%)   57

notched bar strength αku (J/cm2)   73

  hardness 357HB

specimensize    some testing material

heat treatment and metallographic structure

Heat treatment    900°Coil quenching+870°Coil quenching,200°Ctempering

Metallographic structure: tempering martensite.

application

Used as the shaft and connecting rod under high velocity and high bending load,the bolt with strong impact force of the mercury gear,mercury rotor,clutch,high-pressure vessel cover.

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