Stainless Steel
420 · 1.4021
Also known as X20Cr13 / SUS420J1
Hardenable martensitic stainless for cutlery, blades and shafts.
Stainless 420 (material 1.4021, X20Cr13) is a hardenable martensitic stainless steel combining moderate corrosion resistance with high hardness after heat treatment. Used for cutlery, blades, valve parts and shafts. Supplied as round and bright bar.
International equivalents.
The same steel by country and standard — near matches; mill certificate governs.
Chemical composition.
Indicative, % by weight per EN 10088-3. Mill certificate governs.
| Element | % |
|---|---|
| C | 0.16 – 0.25 |
| Si | ≤ 1.00 |
| Mn | ≤ 1.50 |
| Cr | 12.0 – 14.0 |
| P | ≤ 0.040 |
| S | ≤ 0.015 |
Mechanical properties.
Indicative values for a reference section and heat-treatment condition. Actual properties vary with dimension and treatment, and are confirmed on the mill certificate.
Available forms.
Size: Ø 3 – 200 mm · flats, plates & sheet to specification
Typical applications.
- Cutlery & blades
- Valve & pump parts
- Shafts
- Surgical & tooling parts
FAQ.
What is 420?
Stainless 420 (material 1.4021, X20Cr13) is a hardenable martensitic stainless steel combining moderate corrosion resistance with high hardness after heat treatment. Used for cutlery, blades, valve parts and shafts. Supplied as round and bright bar.
Is 420 the same as X20Cr13?
Yes — 420 and X20Cr13, SUS420J1 are matching designations for the same steel across different standards (EN, AISI/SAE, JIS, GB, former DIN). They are near equivalents and may differ slightly in chemistry, so the mill certificate governs the exact specification.
What are the international equivalents of 420?
420 corresponds to 1.4021 (X20Cr13) (EN), 420 (AISI), SUS420J1 (JIS). Equivalents are nearest matches by country/standard; the mill certificate governs the exact specification.
In which forms is 420 available?
420 is supplied as Round bar, Bright / cold-drawn bar, Flat bar, in Ø 3 – 200 mm (bar diameter; flats, plates and sheet are quoted to specification).
What is 420 used for?
Typical applications include Cutlery & blades, Valve & pump parts, Shafts, Surgical & tooling parts.