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Alloy steel SAE 4340

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SAE 4340
Chemical composition: C=0.40%, Mn=0.7%, Mo=0.25%, Cr=0.8%, Ni-1.8%
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) 12.6*10-6 ºCˉ¹ 7.00*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 2.48*10-7 Ohm*m 2.48*10-5 Ohm*cm
Tensile strength (annealed) 745 MPa 108000 psi
Yield strength (annealed) 472 MPa 68500 psi
Elongation (annealed) 28 % 22 %
Hardness (annealed) 96 RB 96 RB
Tensile strength (normalized) 1279 MPa 195500 psi
Yield strength (normalized) 862 MPa 125000 psi
Elongation (normalized) 20 % 12 %
Hardness (normalized) 40 (112) RC (RB) 40 (112) RC (RB)

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alloy_steel_sae_4340.txt · Last modified: 2023/12/13 by dmitri_kopeliovich
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