42CD4 Sheet Q+T which standard hardness is 28-32 HRC generally

42CD4 Sheet Q+T is not 42CD4

if you want to get the 42CD4 Sheet Q+T in China,Frankly,99% of them are 42Crmo Q+T,which means the chemical component is

42CD4 Sheet Q+T which standard hardness is 28-32 HRC generally.

In China, if you want to get the 42CD4 Sheet Q+T ,Frankly,99% of them are 42Crmo Q+T,which means the chemical component is

	C	Si	Mn	S	P	Cr	Mo
42CRMO	0.38-0.45	0.17-0.37	0.50-0.80	≤0.035	≤0.035	0.90-1.20	0.15-0.25

Actully,Is the similar one as 42CD4 material,as different country have their own producing standard,and most of end user of 42CD4 Sheet Q+T,they told me that it’s used all same,and they don’t think it’s any different.

ASTM A29/29M	C	Si	Mn	Cr	Mo	P	S
4140	0.38～0.43	0.15～0.35	0.75～1.00	0.80～1.10	0.15～0.25	≤0.035	≤0.040
DIN WN-r	C	Si	Mn	Cr	Mo	P	S
1.7225	0.38～0.45	≤0.40	0.60～0.90	0.90～1.20	0.15～0.30	≤0.035	≤0.035
GB/T	C	Si	Mn	Cr	Mo	P	S
42CrMo	0.38～0.45	0.17～0.37	0.50～0.80	0.90～1.20	0.15～0.25	≤0.030	≤0.030
BS	C	Si	Mn	Cr	Mo	P	S
708M40	0.36～0.44	0.10～0.35	0.70～1.00	0.90～1.20	0.15～0.25	≤0.035	≤0.035
JIS	C	Si	Mn	Cr	Mo	P	S
SCM440	0.38～0.43	0.15～0.35	0.60～0.85	0.90～1.20	0.15～0.30	≤0.030	≤0.030

Applications

42CD4 Sheet Q+T steel is a alloy structural steel, 42CD4 is used for engineering structural, like high tensile shafts, bolts and nuts, gears, pinions and spindles. Locomotive traction with the big gear, supercharger drive gear, pressure vessel, rear axle, gear load of connecting rod and a spring clip,42CD4 can also be used to under 2000 m deep well of oil drill pipe joint and the fishing tool, and can be used for bending machine mould, etc.

Tempering
42CD4 Sheet Q+T can be tempered at 205 to 649°C (400 to 1200°F) depending,upon the desired hardness level. The hardness of the steel can be increased, if it has lower tempering temperature. For example, tensile strength of 225 ksi cab be achieved by tempering at 316°C (600°F), and a tensile strength of 130 ksi can be achieved by tempering at 538°C (1000°F).

Ms Sharon Wan

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