Skip to product information
1 of 1

AISI 420 - EN 1.4021

AISI 420 - EN 1.4021

AISI 420 - EN 1.4021 is a martensitic machining bar with improved machinability due to the addition of Sulphur. This alteration enhances workability of the steel, but causes a decrease in corrosion resistance, weldability, and formability when compared to non-free machining Grade 410.

Equivalent grades

• DIN 1.4021
• UNS S42000
• X20Cr13

Chemical Composition Reference


Physical Property Reference

• Density: 7.75 g/cm³

• Thermal Expansion: 10.3 x10^-6/K

• Modulus of Elasticity: 200 GPa

• Thermal Conductivity: 24.9 W/m.K

• Electrical Resistivity: 0.55 x10^-6 Ω .m

Stock & Dimensions

Our warehouse has a large number of stock to provide you with a variety of products in different sizes, and can also customize the size according to your needs.
• Bar: 0.5~600mm Diameter
• Coil: 0.5~150mm Thick
• Plate: 0.5~200mm Thick
• Pipe: 6~630mm External Diameter; 0.5~40mm Wall Tick
• Available in specific sizes

Product Forms

We provide you with a variety of product forms, including but not limited to:
• Bar/Rod
• Pipe/Tube
• Coil/Strip
• Plate/Sheet/Circle
• Wire
• Fitting (Flange, Elbow, Tee...)
• Customize

View full details

AISI 420 - EN 1.4021

Essential details
ASTM 420 stainless steel is a high-carbon steel with a minimum chromium content of 12%. Like any other stainless steel, 1.4021 can also be hardened through heat treatment. It offers good ductility in its annealed state and excellent corrosion resistance properties when the metal is polished, surface grounded or hardened. This grade has the highest hardness - 50HRC - among all the stainless steel grades with 12% chromium.

Typical Applications:

- Shear blades

- Needle valves

- Surgical equipment

- Cutlery

Get a free Quote

Call Us:
Visit Us:
Building #32, No.288 Xinzhuan Road, Songjiang District, Shanghai, China 201612
Email Us:

Get a free Quote

  • Sales Executive of Ninesteel, contact us for free quote
  • Account Manager of Ninesteel, contact us for free quote