Steel grade equivalents chart
Nearest-equivalent designations for 28 common steels in AISI/ASTM, EN (steel name and number), JIS and China GB. For example, 304 stainless is EN 1.4301 (X5CrNi18-10), JIS SUS304 and GB 06Cr19Ni10; 4140 is 1.7225 (42CrMo4), SCM440 and 42CrMo.
- AISI / ASTM / SAE US
- 304
- EN steel number EN 10027-2
- 1.4301
- EN steel name EN 10027-1
- X5CrNi18-10
- JIS Japan
- SUS304
- GB China
- 06Cr19Ni10
- Family
- Austenitic stainless
Cross-reference
Open a grade for what it is, typical uses, machining notes and related grades.
| AISI / ASTM | EN name | EN number | JIS | China GB | Type |
|---|---|---|---|---|---|
| Stainless steel | |||||
| 304 | X5CrNi18-10 | 1.4301 | SUS304 | 06Cr19Ni10 | Austenitic stainless |
| 304L | X2CrNi18-9 | 1.4307 | SUS304L | 022Cr19Ni10 | Austenitic stainless, low carbon |
| 316 | X5CrNiMo17-12-2 | 1.4401 | SUS316 | 06Cr17Ni12Mo2 | Austenitic stainless with molybdenum |
| 316L | X2CrNiMo17-12-2 | 1.4404 | SUS316L | 022Cr17Ni12Mo2 | Austenitic stainless with molybdenum, low carbon |
| 321 | X6CrNiTi18-10 | 1.4541 | SUS321 | 06Cr18Ni11Ti | Austenitic stainless, titanium stabilised |
| 303 | X8CrNiS18-9 | 1.4305 | SUS303 | Y12Cr18Ni9 | Austenitic stainless, free-machining |
| 310S | X8CrNi25-21 | 1.4845 | SUS310S | 06Cr25Ni20 | Austenitic heat-resisting stainless |
| 201 | X12CrMnNiN17-7-5 | 1.4372 | SUS201 | 12Cr17Mn6Ni5N | Austenitic chromium-manganese stainless |
| 430 | X6Cr17 | 1.4016 | SUS430 | 10Cr17 | Ferritic stainless |
| 410 | X12Cr13 | 1.4006 | SUS410 | 12Cr13 | Martensitic stainless |
| 420 | X20Cr13 | 1.4021 | SUS420J1 | 20Cr13 | Martensitic stainless |
| 440C | X105CrMo17 | 1.4125 | SUS440C | 108Cr17 | Martensitic stainless, high carbon |
| 17-4PH (630) | X5CrNiCuNb16-4 | 1.4542 | SUS630 | 05Cr17Ni4Cu4Nb | Precipitation-hardening stainless |
| 2205 duplex | X2CrNiMoN22-5-3 | 1.4462 | SUS329J3L | 022Cr23Ni5Mo3N | Duplex (austenitic-ferritic) stainless |
| Carbon and alloy steel | |||||
| 1020 | C22 | 1.0402 | S20C | 20 | Low-carbon steel |
| 1045 | C45 | 1.0503 | S45C | 45 | Medium-carbon steel |
| 4130 | 25CrMo4 | 1.7218 | SCM430 | 30CrMo | Chromium-molybdenum alloy steel |
| 4140 | 42CrMo4 | 1.7225 | SCM440 | 42CrMo | Chromium-molybdenum alloy steel |
| 8620 | 20NiCrMo2-2 | 1.6523 | SNCM220 | 20CrNiMo | Nickel-chromium-molybdenum case-hardening steel |
| 52100 | 100Cr6 | 1.3505 | SUJ2 | GCr15 | High-carbon chromium bearing steel |
| A36 | S235JR | 1.0038 | SS400 | Q235B | Structural carbon steel |
| A572 Gr 50 | S355JR | 1.0045 | SM490A | Q355B | High-strength low-alloy structural steel |
| Tool steel | |||||
| D2 | X153CrMoV12 | 1.2379 | SKD11 | Cr12Mo1V1 | Cold-work tool steel, air-hardening |
| H13 | X40CrMoV5-1 | 1.2344 | SKD61 | 4Cr5MoSiV1 | Hot-work tool steel |
| O1 | 100MnCrW4 | 1.2510 | SKS3 | 9CrWMn | Cold-work tool steel, oil-hardening |
| A2 | X100CrMoV5 | 1.2363 | SKD12 | Cr5Mo1V | Cold-work tool steel, air-hardening |
| M2 | HS6-5-2 | 1.3343 | SKH51 | W6Mo5Cr4V2 | Molybdenum high-speed steel |
| P20 | 40CrMnMo7 | 1.2311 | — | 3Cr2Mo | Pre-hardened mould steel |
Equivalents are nearest matches, not identical grades. Composition limits, mechanical properties and test requirements differ in detail between standards and product forms. For anything that matters, the governing standard, the drawing and the mill certificate decide.
Designation systems
How each country names the same steel.
AISI / SAE / ASTMUnited States. Stainless and alloy steels use AISI/SAE numbers such as 304 or 4140; structural steels use ASTM specification names such as A36.
EN name and numberEurope. EN 10027-1 names describe the chemistry (X5CrNi18-10, 42CrMo4); EN 10027-2 numbers such as 1.4301 identify the same steel.
JISJapan. Prefixes show the product group: SUS stainless, SCM chromium-molybdenum, SKD and SKS tool steels, SKH high-speed steel.
GBChina. Recent GB stainless names start with the carbon content (06Cr19Ni10); older names such as 0Cr18Ni9 still appear on drawings and certificates.