JIS steel grades — 2322 designations — Page 30
Every grade designated under JIS, with the identifying and comparative data we hold for each. 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. 13 of 50 rows differ and carry an “Indicative” mark.
Also known as
2322 designations| Grade | Category | C% by weight | Also inother standards |
|---|---|---|---|
| STKM18C | Unalloyed structural steels | ≤ 0.18 | 1 |
| STKM19A | Unalloyed structural steels | ≤ 0.25 | 1 |
| STKM19C | Unalloyed structural steels | ≤ 0.25 | 1 |
| STKM19C Indicative | Unalloyed structural steels | ≤ 0.21 | 26 |
| STKM20A | Unalloyed structural steels | ≤ 0.25 | 1 |
| STKN400B | Unalloyed structural steels | ≤ 0.25 | — |
| STKN400W | Unalloyed structural steels | ≤ 0.25 | — |
| STKN490B | Unalloyed structural steels | ≤ 0.22 | — |
| STKR400 | Unalloyed structural steels | ≤ 0.25 | — |
| STKR400 Indicative | Unalloyed structural steels | ≤ 0.21 | 26 |
| STKR490 | Unalloyed structural steels | ≤ 0.18 | — |
| STKR490 Indicative | Unalloyed structural steels | ≤ 0.2 | 22 |
| STKR490 Indicative | Unalloyed structural steels | ≤ 0.2 | 20 |
| STKT590 | High-strength steels | ≤ 0.12 | — |
| STM-C540 | — | — | — |
| STM-C640 | — | — | — |
| STM-R590 | — | — | — |
| STM-R690 | — | — | — |
| STM-R780 | — | — | — |
| STM-R830 | — | — | — |
| STPA12 | — | 0.1–0.2 | — |
| STPA20 | — | 0.1–0.2 | — |
| STPA20 Indicative | Case hardening steels | 0.13–0.17 | 18 |
| STPA20 Indicative | Heat-resistant structural steels | 0.08–0.18 | 22 |
| STPA22 | — | ≤ 0.15 | — |
| STPA22 Indicative | Case hardening steels | 0.13–0.17 | 18 |
| STPA22 Indicative | Heat-resistant structural steels | 0.08–0.18 | 22 |
| STPA23 | — | ≤ 0.15 | — |
| STPA24 | — | ≤ 0.15 | — |
| STPA25 | — | ≤ 0.15 | — |
| STPA25 Indicative | Hydrogen resistant steels | 0.1–0.15 | 13 |
| STPA26 | — | ≤ 0.15 | — |
| STPA26 Indicative | Hydrogen resistant steels | 0.08–0.15 | 6 |
| STPG370 | Unalloyed structural steels | ≤ 0.25 | — |
| STPG410 | Unalloyed structural steels | ≤ 0.3 | — |
| STPL380 | Low-temperature structural steels | ≤ 0.25 | — |
| STPL380 Indicative | Weathering steels | ≤ 0.12 | 16 |
| STPL450 | Low-temperature structural steels | ≤ 0.18 | — |
| STPL690 | Low-temperature structural steels | ≤ 0.13 | — |
| STPT370 | — | ≤ 0.25 | — |
| STPT38 Indicative | Quenched and tempered steels | 0.35–0.45 | 15 |
| STPT410 | — | ≤ 0.3 | — |
| STPT480 | — | ≤ 0.33 | — |
| STPT480 Indicative | Fine-grain structural steels | 0.15–0.2 | 14 |
| STPY400 | Unalloyed structural steels | ≤ 0.25 | — |
| STS370 | Unalloyed structural steels | ≤ 0.25 | — |
| STS410 | Unalloyed structural steels | ≤ 0.3 | 1 |
| STS480 | Unalloyed structural steels | ≤ 0.33 | — |
| STW290 | Unalloyed structural steels | — | — |
| STW370 | Unalloyed structural steels | ≤ 0.25 | — |
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.