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420 Stainless Steel, UNS S42000

Strip, Foil, Wire, AMS 5506, ASTM A-176


Cutlery, surgical and dental instruments, scissors, tapes, straight edges, fasteners, firearms.


Type 420 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.

Chemistry Typical

Carbon: 0.30-0.40
Manganese: 1.00 max
Silicon: 1.00 max
Chromium: 12.00-14.00
Nickel: 0.50 max
Molybdenum: 0.50 max
Phosphorus: 0.040 max
Sulfur: 0.030 max 
Copper: 0.50 max 
Aluminum: 0.15 max 
Silicon: 0.050 max
Iron:  Balance

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)


Coil - Strip, Foil, Ribbon
Wire - Profile, Round, Flat, Square

Mechanical Properties at Room Temperature

Properties: Annealed Typical
Ultimate Tensile Strength:  100 KSI max (690 MPa max)
Yield Strength (0.2% offset): 60 KSI max (414 MPa max)
Elongation: 15% min
Hardness: B 96 max

Properties: Tempered
Type 420 can be cold rolled to various tempers.  Please consult Ulbrich Technical Services for additional information.

Additional Properties

Corrosion Resistance
Type 420 provides full corrosion resistance only in the 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.


# 1 – Hot rolled annealed and descaled. It is available in strip, foil and ribbon. It is used for applications where a smooth decorative finish is not required.
# 2D – Dull finish produced by cold rolling, annealing and descaling. Used for deep drawn parts and those parts that need to retain lubricants in the forming process.
# 2B – Smooth finish produced by cold rolling, annealing and descaling. A light cold rolling pass is added after anneal with polished rolls giving it a brighter finish than 2D.
#BA Bright annealed cold rolled and bright annealed
#CBA Course bright annealed cold rolled matte finish and bright anneal
#2 Cold Rolled
# 2BA – Smooth finish produced by cold rolling and bright annealing. A light pass using highly polished rolls produces a glossy finish. A 2BA finish may be used for lightly formed applications where a glossy finish is desired in the formed part.
Polished - Various grit finish for specific polish finished requirements

Wire Finishes

XC - Extra clean, bright annealed or bright annealed and cold rolled
Grease- Ultra bright finish for decorative applications
Soap- Soap is not removed from tempered wire to act as a lubricant.

Cold Forming
Type 420 can be moderately drawn and formed in the annealed condition.

Heat Treatment
Alloy 420 can be hardened by cold working and by heat treating.  Please refer to Ulbrich Technical Services Department for more information. Alloy 420 is capable of being heat treated to a hardness of HRC 51 minimum.

The martensitic class of stainless steels has limited weldability due to its hardenability. For best results refer to: SSINA's "Welding of Stainless Steels and Other Joining Methods".


Limitation of Liability and Disclaimer of Warranty:  In no event will Ulbrich Stainless Steels and Special Metals, Inc., be liable for any damages arising from the use of the information included in this document or that it is suitable for the 'applications' noted.  We believe the information and data provided to be accurate to the best of our knowledge but, all data is considered typical values only.  It is intended for reference and general information and not recommended for specification, design or engineering purposes.  Ulbrich assumes no implied or express warranty in regard to the creation or accuracy of the data provided in this document.