Project Description
Introduction
AISI 420 (W.Nr. 1.4021, X20Cr13, UNS S42000) is a medium-carbon martensitic stainless steel of the 400-series. Its 12–14% chromium content provides moderate corrosion resistance in mild and non-chloride environments, while its carbon level (0.16–0.25%) enables hardening to high strength and wear resistance. The grade serves the cutlery, medical instrument, oil & gas, automotive, food processing, and tooling industries worldwide.
Stainless Steel Round Bar
Similar Grades & Standards
| Standard | Designation | Document(s) |
|---|---|---|
| AISI / UNS | 420 / S42000 | — |
| ASTM | Grade 420 | A276, A314, A473, A580 |
| AMS | — | AMS 5621, AMS-QQ-S-763 |
| EN | X20Cr13 / 1.4021 | EN 10088-1, EN 10088-3 |
| DIN | X20Cr13 / 1.4021 | DIN 17440 |
| BS | 420S29 / 420S37 | BS 970 Part 3 |
| JIS | SUS420J1 | JIS G4303 |
| GOST | 20Kh13 (20Х13) | GOST 5632 |
| ISO | 20Cr13 | ISO 683-17 |
Applications
| Industry | Typical Parts & Components |
|---|---|
| Cutlery & Consumer | Chef knives, scissors, pocket knife blades, razor blades |
| Medical & Dental | Surgical scissors, scalpel handles, needle holders, dental curettes |
| Oil & Gas / Chemical | Pump shafts, valve stems, valve seats, plunger rods |
| Automotive | Crankshafts, axles, gearbox pinions, spindles |
| Energy & Industrial | Turbine blades, hydraulic cylinder rods, pump impellers, bearings |
| Food Processing | Slicing blades, food machine rollers, kitchen appliance parts |
| Tooling & Mould | Plastic injection mould inserts, die-casting pins, gauges |
Supply Forms & Sizes
| Form | Typical Size Range | Common Condition |
|---|---|---|
| Round Bar | Ø 6 – 800 mm | Annealed, Q+T, Bright |
| Flat Bar | T 3–100 mm × W 10–300 mm | Annealed, Hot-rolled |
| Sheet / Plate | T 0.5–50 mm, W up to 2000 mm | 2B, BA, Hot-rolled annealed |
| Seamless Tube / Pipe | OD 10 – 200 mm | Annealed, Pickled |
| Wire | Ø 0.10 – 16 mm | Annealed, Cold-drawn |
Chemical Composition
Per EN 10088-3 — cast analysis (mass %)
| C | Si max | Mn max | P max | S max | Cr |
|---|---|---|---|---|---|
| 0.16 – 0.25 | 1.00 | 1.50 | 0.040 | 0.030 | 12.0 – 14.0 |
Mechanical Properties
Per EN 10088-3 (bar ≤ 160 mm) and ASTM A276
| Condition | Rm (MPa) | Rp0.2 (MPa) | A5 (%) | Hardness |
|---|---|---|---|---|
| Annealed (+A) | ≤ 760 | — | — | ≤ 230 HB |
| Q+T 700 (EN 10088-3) | 700 – 850 | ≥ 500 | ≥ 15 | ~210 HB |
| Hardened (ASTM A276) | ≥ 1035 | ≥ 827 | ≥ 12 | ≥ 302 HB / ~50 HRC |
Heat treatment (hardening): Austenitize 980–1065 °C → quench in air or oil → temper 205–370 °C. Scaling resistance up to 600 °C in service.