420 stainless steel plate

420 Stainless Steel Plate

420 Stainless Steel Plate Manufacturer in China

The 420 stainless steel plates are a kind of martensitic stainless steel with a content of 12% Chromium. They can provide the best corrosive resistance when the surface is polished/ground and hardened. The 420 stainless steel plates can be hardened to 500HB but provide excellent ductility in annealed conditions.

Additionally, these types of stainless-steel alloys are known as surgical steel, which frequently used high-carbon martensitic steel. Alloy 420 is similar to 410 alloys but has more hardness and strength. They can withstand corrosion in alkalis, fresh water, foods, gasoline, mild acids, and air.

420 Stainless Steel Plate Specification

Wide Range of Applications

Alloy 420 stainless steel plate is widely used for applications where excellent hardness and corrosion are required, such as:

  • Knife blades
  • Cuttery
  • Needle valves
  • Scissors
  • Shear blades
  • Hand tools
  • Surgical instrument
420 Stainless Steel Plate Application
Corrosion Resistance of 420 SS Plate

Corrosion Resistance of 420 SS Plate

  • Alloy 420 stainless steel plate has less resistant compared to austenitic grades
  • Excellent resistance in hardened environments to foods, atmospheres, mild acids, and fresh waters.
  • Low resistance in the annealed condition
  • Perfect with smooth surface finishes

Heat Treatment

  • Annealing: Heat to 816 – 899°C (1500 – 1650°F) for extreme softness and cool moderately in the furnace.
  • Stress Relieving: Heat to 149 – 427°C (300 – 800°F) for 1-3 hours. Then, cool it in quench or air in water or oil.
  • Hardening: Heat to 982 – 1066°C (1800 -1950°F) after preheat. Then, soaked at temperature and quench in oil or air cool.
420 Stainless Steel Plate Heat Treatment

420-Grade Stainless Steel Plate Processing

Hot Working
Hot Working
  • Moderate temperature up to 1400, then on to 2000-2200 F
  • Forge cool moderately to prevent cracking
  • Need to reheat to maintain the working temperature above 1600 F
Cold Working
Cold Working
  • Can resist only slight cold work
  • Working of radical forming will cause cracking
  • Can be performed welding after preheating to 300 F to 400 F
  • Not often welded. Alloy 420 stainless steel plate has air hardening characteristics.
  • 2 hours post weld tempering
  • 300-400 F temper temperature
  • Air cool for high corrosion resistance and high hardness
  C Mn Si P S Cr
Alloy 420 Max. 0.15 Max. 1.00 Max. 1.00 Max. 0.04 Max. 0.03 Max. 14.0

Min. 12.0

Tempering Temperature Tensile Strength Yield Strength (0.2% Proof) Elongation (50mm) Hardness Brinell
Annealed 655Mpa 345MPa 25% Max. 241 HB
204°C (399°F) 1600 MPa 1360MPa 12% 444 HB
316°C (600°F) 1580 MPa 1365 MPa 14% 444 HB
427°C (800°F) 1620 MPa 1420 MPa 10% 461 HB
538°C (1000°F) 1305 MPa 1095 MPa 15% 375HB
593°C (1099°F) 1035 MPa 810 MPa 18% 302HB
650°C (1202°F) 895MPa 680 MPa 20% 262HB
Density Thermal Conductivity Electrical Resistivity Elasticity Modulus Thermal Expansion Coefficient Specific Heat
7750 kg/m^3 24.9 at 212°F W/mK 550 Microhm/cm at 68°F 200GPa 10.3 µm/m/°C at 32 – 212°F 460 J/kg.K at 32°F to 212°F
– at 932 °F W/mK 10.8 µm/m/°C at 32 – 599°F
17.7 µm/m/°C at 32-1000°F


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