What material is 1.4021 equivalent to?
1.4021 is specified in several European standards, including EN 10088‑2, EN 10028‑7, EN 10296‑2, EN 10088‑1 and EN 10088‑4. In ASTM/UNS nomenclature it corresponds to AISI 420 (UNS S44400). Equivalent grades include JIS SUS420J1.
What is the equivalent of 1.4401 stainless steel?
Stainless steel types 1.4401 and 1.4404 are also known as grades 316 and 316L respectively. Grade 316 is an austenitic grade second only to 304 in commercial importance. 316 stainless steel contains an addition of molybdenum that gives it improved corrosion resistance.
1.4021 vs 1.4404 stainless steel: Chemical Composition Comparison
| Element | 1.4021 (% wt) | 1.4404 (% wt) |
|---|---|---|
| Carbon (C) | 0.16 – 0.25 | ≤ 0.03 |
| Chromium (Cr) | 12.0 – 14.0 | 16.5 – 18.5 |
| Nickel (Ni) | – | 10.0 – 13.0 |
| Molybdenum (Mo) | – | 2.0 – 2.5 |
| Manganese | ≤ 1.00 | ≤ 2.00 |
| Silicon | ≤ 1.00 | ≤ 1.00 |
1.4021 vs 1.4404 stainless steel: Mechanical Properties Comparison
| Property | 1.4021 (Hardened) | 1.4404 (Annealed) |
|---|---|---|
| Tensile Strength (Rm) | 700 – 850 MPa | 480 – 620 MPa |
| Yield Strength (Rp0.2) | ≥ 450 MPa | ≥ 170 MPa |
| Elongation (% A5) | > 10% | > 35% |
| Hardness (HRC) | Up to 50 HRC | ≤ 22 HRC |
| Workability | Moderate (annealed) | Excellent |
| Weldability | Limited (preheating needed) | Excellent (no preheat) |
1.4021 stainless steel vs. 1.4401: Hardness
1.4021 (AISI 420) is significantly harder than 1.4401 (AISI 316) after heat treatment, reaching up to 46-52 HRC compared to 1.4401's Brinell hardness of up to 215 HB or 95 HRB. This is because 1.4021 is a martensitic grade designed for high hardness, while 1.4401 is an austenitic grade focused on corrosion resistance and toughness, not extreme hardness.
1.4021 vs. 1.4401: Corrosion Resistance
1.4401 has significantly superior corrosion resistance, especially in chloride-rich environments, due to its austenitic structure and higher chromium and molybdenum content. In contrast, 1.4021 is a martensitic steel with moderate corrosion resistance, suitable for non-chlorine media like freshwater, dry air, and some acids, but it is susceptible to pitting and stress corrosion cracking in chloride environments.
Are 1.4021 and 1.4401 stainless steels magnetic?
1.4021 is a martensitic stainless steel that is magnetic in both the annealed and quenched states, making it suitable for applications requiring magnetic properties. 1.4401, on the other hand, is an austenitic stainless steel with high chromium (17-19%) and high nickel (8-10.5%) content. It is essentially non-magnetic in the annealed state, but may develop slight magnetism after heavy cold working.
1.4021 vs 1.4404
The main difference is that 1.4021 (AISI 420) is a martensitic stainless steel with higher hardness and moderate corrosion resistance, while 1.4404 (AISI 316L) is an austenitic stainless steel with much higher corrosion resistance, thanks to its molybdenum and nickel content. This means 1.4021 is suitable for applications like knives and tools, while 1.4404 is better for harsh chemical or marine environments.
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