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Alloy steel SAE 4027

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SAE 4027
Chemical composition: C=0.40%, Mn=0.8%, Mo=0.25%
Property Value in metric unit Value in US unit
Density 7.872 *10³ kg/m³ 491.4 lb/ft³
Modulus of elasticity 205 GPa 29700 ksi
Thermal expansion (20 ºC) 12.0*10-6 ºCˉ¹ 6.60*10-6 in/(in* ºF)
Specific heat capacity 477 J/(kg*K) 0.114 BTU/(lb*ºF)
Thermal conductivity 44.6 W/(m*K) 309 BTU*in/(hr*ft²*ºF)
Electric resistivity 2.45*10-7 Ohm*m 2.45*10-5 Ohm*cm
Tensile strength (annealed) 515 MPa 74700 psi
Yield strength (annealed) 325 MPa 47100 psi
Elongation (annealed) 30 % 30 %
Hardness (annealed) 78 RB 78 RB
Tensile strength (normalized) 640 MPa 92800 psi
Yield strength (normalized) 420 MPa 60900 psi
Elongation (normalized) 26 % 26 %
Hardness (normalized) 88 RB 88 RB

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