Martensitic stainless steel hardenable to HRC 48-52. Used for cutlery, surgical instruments, turbine blades and pump shafts.
X20Cr13 (EN 1.4021 / AISI 420) per EN 10088. Can be hardened to HRC 48-52 by oil quenching from 1000-1050 C. Unique combination of moderate corrosion resistance and high hardness. Used for cutlery, surgical blades, pump shafts and valve stems.
| Standard Body | Designation | Country / Region | Note |
|---|---|---|---|
| EN | X20Cr13 | European Union | |
| DIN | 1.4021 | Germany | |
| AISI/SAE | 420 | USA | |
| ASTM | A276 Type 420 | USA | |
| BS EN | 420S29 | UK | |
| JIS | SUS420J1 | Japan | |
| GOST | 20X13 (20Kh13) | Russia / CIS | |
| UNI | X20Cr13 | Italy | |
| NF | Z20C13 | France | |
| SS | 2303 | Sweden | |
| PN | 2H13 | Poland | |
| CSN | 17021 | Czech Republic | |
| UNS | S42000 | USA (UNS) | |
| GB | 20Cr13 | China | |
| JUS | C.4172 | Yugoslavia / Serbia | Martensitic Cr stainless, hardenable; JUS C.B2.070 |
| ISO | X20Cr13 | International |
| # | Standard Body | Designation | Country / Region | Note |
|---|---|---|---|---|
| 1 | EN | X20Cr13 | European Union | — |
| 2 | DIN | 1.4021 | Germany | — |
| 3 | AISI/SAE | 420 | USA | — |
| 4 | ASTM | A276 Type 420 | USA | — |
| 5 | BS EN | 420S29 | UK | — |
| 6 | JIS | SUS420J1 | Japan | — |
| 7 | GOST | 20X13 (20Kh13) | Russia / CIS | — |
| 8 | UNI | X20Cr13 | Italy | — |
| 9 | NF | Z20C13 | France | — |
| 10 | SS | 2303 | Sweden | — |
| 11 | PN | 2H13 | Poland | — |
| 12 | CSN | 17021 | Czech Republic | — |
| 13 | UNS | S42000 | USA (UNS) | — |
| 14 | GB | 20Cr13 | China | — |
| 15 | JUS | C.4172 | Yugoslavia / Serbia | Martensitic Cr stainless, hardenable; JUS C.B2.070 |
| 16 | ISO | X20Cr13 | International | — |
| Element | Symbol | Min % | Max % | Typical % |
|---|---|---|---|---|
| Carbon | C | 0.1600 | 0.2500 | 0.2000 |
| Silicon | Si | — | 1.0000 | 0.5000 |
| Manganese | Mn | — | 1.5000 | 0.6000 |
| Chromium | Cr | 12.0000 | 14.0000 | 13.0000 |
| Condition | Code | Rm min MPa | Rm max MPa |
Re min MPa | Re max MPa |
A₅ min % |
Z % |
KV J |
HB min | HB max | HRC min | HRC max | E GPa |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Annealed | +A | 700 | 900 | 500 | 700 | 15.0 | 40.0 | — | — | 248 | — | — | 215.0 |
| Hardened (oil quench) | H | — | — | — | — | — | — | — | — | — | 48.0 | 52.0 | 215.0 |
| Q+T 600 C (engineering) | +QT600 | 700 | 900 | 550 | 750 | 16.0 | 50.0 | — | 220 | 265 | — | — | 215.0 |
| Coolant | Soluble oil 8-10% |
| Chip Formation | Short-medium chips |
| Tool Material | Carbide M10/P20 |
| Surface Finish | Ra 0.4-1.6 um |