420 High Carbon Stainless Steel UNS S42000
Type 420HC is a martensitic stainless steel that provides good corrosion resistance similar to 410 plus increased strength and hardness.
Tempered 420HC Steel Strip, As Rolled, AMS 5506, ASTM A240
Applications
Cutlery, Surgical and dental instruments, Scissors, Tapes, Straight edges, Fasteners, Firearms
Description
Type 420HC is a martensitic stainless steel that provides good corrosion resistance similar to 410 plus increased strength and hardness. It is magnetic in both the annealed and hardened conditions. Maximum corrosion resistance is attained only in the fully hardened condition. It is never used in the annealed condition. 420HC Steel also offers good ductility when annealed and excellent corrosion resistance properties when the metal is polished, surface ground or hardened.
Chemistry Typical – Element %
Carbon: 0.4 - 0.45
Manganese: 1.0 max
Silicon: 0.25 - 0.75
Phosphorus: 0.04 max
Sulfur: 0.015 max
Chromium: 12.5 - 13.5
Nickel: 0.5 max
Molybdenum: 0.5 max
Aluminum: 0.5 max
Copper: 0.5 max
Tin: 0.05 max
Nitrogen: 0.08 max
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 10-5 (10.2)
32 - 1200 °F (0 – 649 °C): 6.8 x 10-5 (12.1)
Modulus of Elasticity: ksi (MPa)
29 x 103 (200 x 103) tension
Magnetic Permeability: Magnetic
Melting Range: 2723 °F (1495 °C)
Forms
Coil - Strip
Mechanical Properties at Room Temperature
Hardness:
40 - 52 Rockwell C Scale
Properties: Tempered
Type 420HC can be cold rolled to various tempers. Please consult Ulbrich Technical Services for
additional information.
Additional Properties
Corrosion Resistance
Type 420HC provides full corrosion resistance when hardened or hardened and tempered.
In these conditions, its corrosion resistance is similar to type 410.
Refer to NACE (National Association of Corrosion Engineers) for recommendations.
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