420 Stainless Steel

420 is martensitic stainless steel that provides good corrosion resistance similar to 410 plus increased strength and hardness.

420 stainless steel

420 stainless steel is a martensitic higher carbon version of types 410 and 416 stainless.

Type 420 is martensitic steel that provides good corrosion resistance similar to 410 with the benefit of increased strength and hardness. It is magnetic in both the annealed and hardened conditions.

Applications include cutlery, surgical and dental instruments, straight edges, and firearms. We supply type 420 in bar, wire, and billets, contact us for the best prices.

420 Stainless Steel Properties and Specifications

420 stainless steel is a hardenable, martensitic stainless steel with corrosion resistance similar to Type 410. It has a higher carbon content to increase strength and hardness over Type 410. Maximum corrosion resistance only in the fully hardened condition or fully hardened and stress relieved condition. Never used in the annealed condition.

420 stainless steel is available in:

  • Bar
  • Wire
  • Billets

Type 420 Stainless Steel (bar, wire, and billets) is covered by the following specifications:

  • QQ-W-423A
  • MIL-S-862B
  • MIL-S-8142
  • MIL-W-17481A
  • AMS 5621
  • ASTM A276-67
  • ASTM A314-63
  • ASTM A580-67
  • QQ-S-763D
  • Specified for a wide variety of applications where good corrosion and hardness in the range of C50 to C54 is required.
  • Applications include cutlery, surgical and dental instruments, scissors, tapes, and straight edges, gauges, needle valves, ball check valves, gear shafts, cams, pivots, ball bearings, and hand tools.
  • Not normally used at temperatures exceeding 800° F due to rapid softening and loss of corrosion resistance.

420 Stainless Steel Composition & Properties

Property

Type 420%

Carbon

.15 max

Manganese

1.00 max

Silicon

1.00 max

Phosphorus

.040 max

Sulfur

.030 max

Chromium

12.0 – 14.0

Mechanical Properties

Property

Annealed

Hardened

Stress Relieved

Ultimate Tensile Strength, psi

95,000

230,000

.02% Yield Strength, psi

50,000

195,000

Elongation, % in 2?

25

8

Rockwell Hardness

B92

C54

C50

Reduction of area, %

55

25

Impact Strength Izod   V-Notch, ft-lbs

30

5-15

Machinability

Formability

420 Stainless Steel Heat Treatment

Corrosion Resistance

Weldability

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