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420 stainless steel Chemical Composition,420 stainless steel Physical Properties

420 stainless steel is a hardenable, martensitic stainless steel that is a modification of Alloy 410. Similar to 410, it contains a minimum of 12% chromium, just sufficient enough to give corrosion resistant properties. Alloy 420 has higher carbon content than Alloy 410 which is designed to optimize strength and hardness characteristics.

420 stainless steel Chemical Composition
C .22-.27
Mn 1.00 Max.
Si 1.00 Max.
P .040 Max.
S .030 Max.
Cr 12.5/14.00

420 stainless steel Physical Properties

Density: 0.28 lbs/in³, 7.74 g/cm³
Electrical Resistivity: microhm-in (microhm-cm):
68°F (20°C): 21.71 (55.0)

Specific Heat: BTU/lb/°F (kJ/kg•K):
32-212°F (0-100°C): 0.11 (0.46)

Thermal Conductivity: BTU/hr/ft²/ft/°F (W/m•K)
At 212°F (100°C): 14.4 (24.9)
At 932°F (500°C): 16.6 (28.7)

Mean Coefficient of Thermal Expansion:in/in/°F (μm/m•K)
32 – 212°F (0 -100°C): 5.7 x 10-6(10.2)
32 – 1200°F (0 -649°C): 6.8 x 10-6(12.1)

Modulus of Elasticity: ksi (MPa)
29.0 x 10³ (200 x 10³) in tension

Magnetic Permeability: Magnetic
Melting Range: °F (°C) 2723 (1495)

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