Stainless Steel - Grade 440 (UNS S44000)

Material: Stainless Steel - Grade 440 (UNS S44000)
Composition: Fe/.6-.75C/16-18Cr/.75Mo/<1Mn/<1Si/<.04P/<.03S
Property Minimum Value (S.I.) Maximum Value (S.I.) Units (S.I.) Minimum Value (Imp.) Maximum Value (Imp.) Units (Imp.)
Atomic Volume (average) 0.007 0.0073 m3/kmol 427.166 445.473 in3/kmol
Density 7.7 7.9 Mg/m3 480.696 493.181 lb/ft3
Energy Content 86 105 MJ/kg 9317.13 11375.6 kcal/lb
Bulk Modulus 140 163 GPa 20.3053 23.6411 106 psi
Compressive Strength 370 460 MPa 53.664 66.7174 ksi
Ductility 0.15 0.25 0.15 0.25 NULL
Elastic Limit 370 460 MPa 53.664 66.7174 ksi
Endurance Limit 316 367 MPa 45.8319 53.2288 ksi
Fracture Toughness 59 95 MPa.m1/2 53.6928 86.4544 ksi.in1/2
Hardness 1900 2500 MPa 275.572 362.595 ksi
Loss Coefficient 0.00069 0.00086 0.00069 0.00086 NULL
Modulus of Rupture 370 460 MPa 53.664 66.7174 ksi
Poisson's Ratio 0.275 0.285 0.275 0.285 NULL
Shear Modulus 73 83 GPa 10.5878 12.0381 106 psi
Tensile Strength 650 800 MPa 94.2745 116.03 ksi
Young's Modulus 190 210 GPa 27.5572 30.4579 106 psi
Glass Temperature K °F
Latent Heat of Fusion 260 285 kJ/kg 111.779 122.527 BTU/lb
Maximum Service Temperature 973 1073 K 1291.73 1471.73 °F
Melting Point 1643 1753 K 2497.73 2695.73 °F
Minimum Service Temperature 200 230 K -99.67 -45.67 °F
Specific Heat 450 500 J/kg.K 0.348236 0.386929 BTU/lb.F
Thermal Conductivity 23 27 W/m.K 43.0568 50.5449 BTU.ft/h.ft2.F
Thermal Expansion 9 11 10-6/K 16.2 19.8 10-6/°F
Breakdown Potential MV/m V/mil
Dielectric Constant NULL
Resistivity 55 65 10-8 ohm.m 55 65 10-8 ohm.m
Environmental Properties
  Resistance Factors
1=Poor 5=Excellent
Flammability 5
Fresh Water 5
Organic Solvents 5
Oxidation at 500C 5
Sea Water 5
Strong Acid 4
Strong Alkalis 3
UV 5
Wear 4
Weak Acid 5
Weak Alkalis 5

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