--- title: "JIS steel grades — 2322 designations — Page 30" description: "Steel grades designated under JIS, with chemical composition, mechanical properties and equivalents in other standards. 2322 designations across…" canonical: https://steelequivalents.com/materials/jis/page/30 language: en robots: index, follow og_type: website type: material-standard language_alternates: en: https://steelequivalents.com/materials/jis/page/30.md cs: https://steelequivalents.com/cs/materiály/jis.md de: https://steelequivalents.com/de/werkstoffe/jis.md es: https://steelequivalents.com/es/materiales/jis.md fr: https://steelequivalents.com/fr/matériaux/jis.md hu: https://steelequivalents.com/hu/anyagok/jis.md it: https://steelequivalents.com/it/materiali/jis.md nl: https://steelequivalents.com/nl/materialen/jis.md pl: https://steelequivalents.com/pl/materiały/jis.md pt: https://steelequivalents.com/pt/materiais/jis.md ru: https://steelequivalents.com/ru/материалы/jis.md tr: https://steelequivalents.com/tr/malzemeler/jis.md zh: https://steelequivalents.com/zh/材料/jis.md ja: https://steelequivalents.com/ja/材料/jis.md ar: https://steelequivalents.com/ar/المواد/jis.md ko: https://steelequivalents.com/ko/재료/jis.md pt-br: https://steelequivalents.com/pt-br/materiais/jis.md hi: https://steelequivalents.com/hi/सामग्री/jis.md content_hash: sha256:a3fff60d43f35676798aadee0fcb1c9231e54fedf832a1699c13e4b8b6464aa7 generated: 2026-09-26 --- > **Machine-readable Markdown rendering.** This is a Markdown representation of a web page, > served for AI agents and crawlers as a token-efficient alternative to the full HTML. > Full interactive HTML version: https://steelequivalents.com/materials/jis/page/30 > Canonical URL: https://steelequivalents.com/materials/jis/page/30 > Available languages: en, cs, de, es, fr, hu, it, nl, pl, pt, ru, tr, zh, ja, ar, ko, pt-br, hi > Change detection: `content_hash` is the SHA-256 of this document's Markdown body — everything > below this block, whitespace-trimmed, excluding the front-matter. Compare it to detect a real > content change; `generated` moves on every render and is not a change signal. JIS · 2,322 grades # 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 in other standards | |---|---|---|---| | [STKM18C](/materials/jis/stkm18c "STKM18C") | Unalloyed structural steels | ≤ 0.18 | 1 | | [STKM19A](/materials/jis/stkm19a "STKM19A") | Unalloyed structural steels | ≤ 0.25 | 1 | | [STKM19C](/materials/jis/stkm19c "STKM19C") | Unalloyed structural steels | ≤ 0.25 | 1 | | [STKM19C](/materials/jis/stkm19c "STKM19C") Indicative | Unalloyed structural steels | ≤ 0.21 | 26 | | [STKM20A](/materials/jis/stkm20a "STKM20A") | Unalloyed structural steels | ≤ 0.25 | 1 | | [STKN400B](/materials/jis/stkn400b "STKN400B") | Unalloyed structural steels | ≤ 0.25 | — | | [STKN400W](/materials/jis/stkn400w "STKN400W") | Unalloyed structural steels | ≤ 0.25 | — | | [STKN490B](/materials/jis/stkn490b "STKN490B") | Unalloyed structural steels | ≤ 0.22 | — | | [STKR400](/materials/jis/stkr400 "STKR400") | Unalloyed structural steels | ≤ 0.25 | — | | [STKR400](/materials/jis/stkr400 "STKR400") Indicative | Unalloyed structural steels | ≤ 0.21 | 26 | | [STKR490](/materials/jis/stkr490 "STKR490") | Unalloyed structural steels | ≤ 0.18 | — | | [STKR490](/materials/jis/stkr490 "STKR490") Indicative | Unalloyed structural steels | ≤ 0.2 | 22 | | [STKR490](/materials/jis/stkr490 "STKR490") Indicative | Unalloyed structural steels | ≤ 0.2 | 20 | | [STKT590](/materials/jis/stkt590 "STKT590") | High-strength steels | ≤ 0.12 | — | | [STM-C540](/materials/jis/stm-c540 "STM-C540") | — | — | — | | [STM-C640](/materials/jis/stm-c640 "STM-C640") | — | — | — | | [STM-R590](/materials/jis/stm-r590 "STM-R590") | — | — | — | | [STM-R690](/materials/jis/stm-r690 "STM-R690") | — | — | — | | [STM-R780](/materials/jis/stm-r780 "STM-R780") | — | — | — | | [STM-R830](/materials/jis/stm-r830 "STM-R830") | — | — | — | | [STPA12](/materials/jis/stpa12 "STPA12") | — | 0.1–0.2 | — | | [STPA20](/materials/jis/stpa20 "STPA20") | — | 0.1–0.2 | — | | [STPA20](/materials/jis/stpa20 "STPA20") Indicative | Case hardening steels | 0.13–0.17 | 18 | | [STPA20](/materials/jis/stpa20 "STPA20") Indicative | Heat-resistant structural steels | 0.08–0.18 | 22 | | [STPA22](/materials/jis/stpa22 "STPA22") | — | ≤ 0.15 | — | | [STPA22](/materials/jis/stpa22 "STPA22") Indicative | Case hardening steels | 0.13–0.17 | 18 | | [STPA22](/materials/jis/stpa22 "STPA22") Indicative | Heat-resistant structural steels | 0.08–0.18 | 22 | | [STPA23](/materials/jis/stpa23 "STPA23") | — | ≤ 0.15 | — | | [STPA24](/materials/jis/stpa24 "STPA24") | — | ≤ 0.15 | — | | [STPA25](/materials/jis/stpa25 "STPA25") | — | ≤ 0.15 | — | | [STPA25](/materials/jis/stpa25 "STPA25") Indicative | Hydrogen resistant steels | 0.1–0.15 | 13 | | [STPA26](/materials/jis/stpa26 "STPA26") | — | ≤ 0.15 | — | | [STPA26](/materials/jis/stpa26 "STPA26") Indicative | Hydrogen resistant steels | 0.08–0.15 | 6 | | [STPG370](/materials/jis/stpg370 "STPG370") | Unalloyed structural steels | ≤ 0.25 | — | | [STPG410](/materials/jis/stpg410 "STPG410") | Unalloyed structural steels | ≤ 0.3 | — | | [STPL380](/materials/jis/stpl380 "STPL380") | Low-temperature structural steels | ≤ 0.25 | — | | [STPL380](/materials/jis/stpl380 "STPL380") Indicative | Weathering steels | ≤ 0.12 | 16 | | [STPL450](/materials/jis/stpl450 "STPL450") | Low-temperature structural steels | ≤ 0.18 | — | | [STPL690](/materials/jis/stpl690 "STPL690") | Low-temperature structural steels | ≤ 0.13 | — | | [STPT370](/materials/jis/stpt370 "STPT370") | — | ≤ 0.25 | — | | [STPT38](/materials/jis/stpt38 "STPT38") Indicative | Quenched and tempered steels | 0.35–0.45 | 15 | | [STPT410](/materials/jis/stpt410 "STPT410") | — | ≤ 0.3 | — | | [STPT480](/materials/jis/stpt480 "STPT480") | — | ≤ 0.33 | — | | [STPT480](/materials/jis/stpt480 "STPT480") Indicative | Fine-grain structural steels | 0.15–0.2 | 14 | | [STPY400](/materials/jis/stpy400 "STPY400") | Unalloyed structural steels | ≤ 0.25 | — | | [STS370](/materials/jis/sts370 "STS370") | Unalloyed structural steels | ≤ 0.25 | — | | [STS410](/materials/jis/sts410 "STS410") | Unalloyed structural steels | ≤ 0.3 | 1 | | [STS480](/materials/jis/sts480 "STS480") | Unalloyed structural steels | ≤ 0.33 | — | | [STW290](/materials/jis/stw290 "STW290") | Unalloyed structural steels | — | — | | [STW370](/materials/jis/stw370 "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. [Previous](/materials/jis/page/29 "Previous") Page 30 of 47[Next](/materials/jis/page/31 "Next")