JIS steel grades — 2322 designations — Page 29
Every grade designated under JIS, with the material number it maps to, what kind of steel it is, its carbon window and how many other standards carry it. Open a grade for its full composition, properties and its designations in other standards. Unless marked, every name here is an asserted identity — the same grade under this standard’s own designation. 21 of 50 rows differ and carry an “Indicative” mark.
Also known as
2322 designations| Grade | Material no. | Category | C% by weight | Also inother standards |
|---|---|---|---|---|
| STFA25 Indicative | 1.7362 | Hydrogen resistant steels | 0.1–0.15 | 13 |
| STFA26 | — | — | ≤ 0.15 | — |
| STFA26 Indicative | 1.7386 | Hydrogen resistant steels | 0.08–0.15 | 6 |
| STH11 | — | — | ≤ 0.5 | — |
| STH12 | — | — | 0.3–0.41 | — |
| STH21 | — | — | 0.25–0.35 | — |
| STH22 | — | — | 0.33–0.38 | — |
| STH31 | — | — | 0.35–0.4 | — |
| STK290 | — | Unalloyed structural steels | — | 1 |
| STK400 | — | Unalloyed structural steels | ≤ 0.25 | 1 |
| STK400 Indicative | 1.0044 | Unalloyed structural steels | ≤ 0.21 | 26 |
| STK490 | — | Unalloyed structural steels | ≤ 0.18 | 1 |
| STK490 Indicative | 1.0570 | Unalloyed structural steels | ≤ 0.2 | 22 |
| STK490 Indicative | 1.0570 | Unalloyed structural steels | ≤ 0.2 | 20 |
| STK490 Indicative | 1.0562 | Fine-grain structural steels | ≤ 0.18 | 18 |
| STK500 | — | Unalloyed structural steels | ≤ 0.24 | 1 |
| STK540 | — | Unalloyed structural steels | ≤ 0.23 | 1 |
| STK540 Indicative | 1.8902 | Fine-grain structural steels | ≤ 0.2 | 19 |
| STKM 12A Indicative | 1.0038 | Unalloyed structural steels | ≤ 0.17 | 26 |
| STKM 12A STKM 12C Indicative | 1.0038 | Unalloyed structural steels | ≤ 0.17 | 26 |
| STKM 12C Indicative | 1.0038 | Unalloyed structural steels | ≤ 0.17 | 26 |
| STKM11A | — | Unalloyed structural steels | ≤ 0.12 | 1 |
| STKM12A | — | Unalloyed structural steels | ≤ 0.2 | 1 |
| STKM12A Indicative | 1.0028 | Unalloyed structural steels | ≤ 0.15 | 18 |
| STKM12A Indicative | 1.0402 | Quenched and tempered steels | 0.17–0.24 | 24 |
| STKM12A Indicative | 1.0301 | Case hardening steels | 0.07–0.13 | 20 |
| STKM12A Indicative | 1.0036 | Unalloyed structural steels | ≤ 0.17 | 20 |
| STKM12A Indicative | 1.0036 | Unalloyed structural steels | ≤ 0.17 | 19 |
| STKM12A-S Indicative | 1.0402 | Quenched and tempered steels | 0.17–0.24 | 24 |
| STKM12B | — | Unalloyed structural steels | ≤ 0.2 | 1 |
| STKM12C | — | Unalloyed structural steels | ≤ 0.2 | 1 |
| STKM13A | — | Unalloyed structural steels | ≤ 0.25 | 1 |
| STKM13B | — | Unalloyed structural steels | ≤ 0.25 | 1 |
| STKM13B Indicative | 1.0402 | Quenched and tempered steels | 0.17–0.24 | 24 |
| STKM13B-W Indicative | 1.0402 | Quenched and tempered steels | 0.17–0.24 | 24 |
| STKM13C | — | Unalloyed structural steels | ≤ 0.25 | 1 |
| STKM14A | — | Unalloyed structural steels | ≤ 0.3 | 1 |
| STKM14B | — | Unalloyed structural steels | ≤ 0.3 | 1 |
| STKM14C | — | Unalloyed structural steels | ≤ 0.3 | 1 |
| STKM15A | — | Unalloyed structural steels | 0.25–0.35 | 1 |
| STKM15C | — | Unalloyed structural steels | 0.25–0.35 | 1 |
| STKM16A | — | Unalloyed structural steels | 0.35–0.45 | 1 |
| STKM16A Indicative | 1.0507 | Others | ≤ 0.2 | 8 |
| STKM16C | — | Unalloyed structural steels | 0.35–0.45 | 1 |
| STKM16C Indicative | 1.0570 | Unalloyed structural steels | ≤ 0.2 | 22 |
| STKM16C Indicative | 1.0570 | Unalloyed structural steels | ≤ 0.2 | 20 |
| STKM17A | — | Unalloyed structural steels | 0.45–0.55 | 1 |
| STKM17C | — | Unalloyed structural steels | 0.45–0.55 | 1 |
| STKM18A | — | Unalloyed structural steels | ≤ 0.18 | 1 |
| STKM18B | — | Unalloyed structural steels | ≤ 0.18 | 1 |
This grade’s own name — recorded in our sources as this grade’s own designation under that standard.
Indicative — taken from a published cross-reference table; a close match, not a guarantee of interchangeability. Verify against the mill certificate before ordering.
Withdrawn — designation no longer current — a separate column from the two above, so a name can be same grade and withdrawn at once.