SA574 4340

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Alias

SA574 4340

Chemistry

Alloy Steel

Element	Min	Max
C (Carbon)	0.43%	0.48%
Mn (Manganese)	0.6%	0.8%
P (Phosphorus)		0.035%
S (Sulphur)		0.040%
Si (Silicon)	0.15%	0.35%
Ni (Nickel)	1.65%	2.%
Cr (Chromium)	0.7%	0.9%
Mo (Molybdenum)	0.2%	0.3%

Mechanical Property	Min	Max
Tensile Strength	1220 MPa
Yield Strength 0.2% offset	1100 MPa
Elongation	10% 5D
Reduction of Area	35%
Hardness (Rockwell C)	38 HRC	44 HRC
Hardness (Vickers)	372 DPH	434 DPH

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