--- title: "KS steel grades — 823 designations — Page 9" description: "Steel grades designated under KS, with chemical composition, mechanical properties and equivalents in other standards. 823 designations across 764…" canonical: https://steelequivalents.com/materials/ks/page/9 language: en robots: index, follow og_type: website type: material-standard language_alternates: en: https://steelequivalents.com/materials/ks/page/9.md cs: https://steelequivalents.com/cs/materiály/ks.md de: https://steelequivalents.com/de/werkstoffe/ks.md es: https://steelequivalents.com/es/materiales/ks.md fr: https://steelequivalents.com/fr/matériaux/ks.md hu: https://steelequivalents.com/hu/anyagok/ks.md it: https://steelequivalents.com/it/materiali/ks.md nl: https://steelequivalents.com/nl/materialen/ks.md pl: https://steelequivalents.com/pl/materiały/ks.md pt: https://steelequivalents.com/pt/materiais/ks.md ru: https://steelequivalents.com/ru/материалы/ks.md tr: https://steelequivalents.com/tr/malzemeler/ks.md zh: https://steelequivalents.com/zh/材料/ks.md ja: https://steelequivalents.com/ja/材料/ks.md ar: https://steelequivalents.com/ar/المواد/ks.md ko: https://steelequivalents.com/ko/재료/ks.md pt-br: https://steelequivalents.com/pt-br/materiais/ks.md hi: https://steelequivalents.com/hi/सामग्री/ks.md content_hash: sha256:f42ed965a76e77f7d4971b73e2e92fe1d0e3d98521441927d3bcd9091ce0f9f0 generated: 2026-09-25 --- > **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/ks/page/9 > Canonical URL: https://steelequivalents.com/materials/ks/page/9 > 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. KS · 823 grades # KS steel grades — 823 designations — Page 9 Every grade designated under KS, 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. 15 of 50 rows differ and carry an “Indicative” mark. ## Also known as 823 designations | Grade | Category | C% by weight | |---|---|---| | [STBH340](/materials/ks/stbh340 "STBH340") | — | ≤ 0.18 | | [STBH410](/materials/ks/stbh410 "STBH410") | — | ≤ 0.32 | | [STBH510](/materials/ks/stbh510 "STBH510") | — | ≤ 0.25 | | [STC105](/materials/ks/stc105 "STC105") | Unalloyed tool steels / carbon steels | 1–1.1 | | [STC120](/materials/ks/stc120 "STC120") | Unalloyed tool steels / carbon steels | 1.15–1.25 | | [STC140](/materials/ks/stc140 "STC140") | Unalloyed tool steels / carbon steels | 1.3–1.5 | | [STC2](/materials/ks/stc2 "STC2") Indicative | — | 1.15–1.24 | | [STC3](/materials/ks/stc3 "STC3") Indicative | Unalloyed tool steels / carbon steels | 1–1.1 | | [STC3](/materials/ks/stc3 "STC3") Indicative | Unalloyed tool steels / carbon steels | 0.85–0.95 | | [STC4](/materials/ks/stc4 "STC4") Indicative | Unalloyed tool steels / carbon steels | 0.85–0.95 | | [STC5](/materials/ks/stc5 "STC5") Indicative | Unalloyed tool steels / carbon steels | 0.75–0.85 | | [STC6](/materials/ks/stc6 "STC6") Indicative | Unalloyed tool steels / carbon steels | 0.75–0.85 | | [STC60](/materials/ks/stc60 "STC60") | Unalloyed tool steels / carbon steels | 0.55–0.65 | | [STC65](/materials/ks/stc65 "STC65") | Unalloyed tool steels / carbon steels | 0.6–0.7 | | [STC70](/materials/ks/stc70 "STC70") | Unalloyed tool steels / carbon steels | 0.65–0.75 | | [STC75](/materials/ks/stc75 "STC75") | Unalloyed tool steels / carbon steels | 0.7–0.8 | | [STC80](/materials/ks/stc80 "STC80") | Unalloyed tool steels / carbon steels | 0.75–0.85 | | [STC85](/materials/ks/stc85 "STC85") | Unalloyed tool steels / carbon steels | 0.8–0.9 | | [STC90](/materials/ks/stc90 "STC90") | Unalloyed tool steels / carbon steels | 0.85–0.95 | | [STC95](/materials/ks/stc95 "STC95") | Unalloyed tool steels / carbon steels | 0.9–1 | | [STD1](/materials/ks/std1 "STD1") | — | 1.9–2.2 | | [STD1](/materials/ks/std1 "STD1") Indicative | Tool steels for cold work | 1–1.1 | | [STD1](/materials/ks/std1 "STD1") Indicative | Tool steels for cold work | 1.9–2.2 | | [STD10](/materials/ks/std10 "STD10") | — | 1.45–1.6 | | [STD11](/materials/ks/std11 "STD11") | — | 1.4–1.6 | | [STD11](/materials/ks/std11 "STD11") Indicative | Tool steels for cold work | 1.45–1.6 | | [STD12](/materials/ks/std12 "STD12") | — | 0.95–1.05 | | [STD2](/materials/ks/std2 "STD2") | — | 2–2.3 | | [STD4](/materials/ks/std4 "STD4") | — | 0.25–0.35 | | [STD5](/materials/ks/std5 "STD5") | — | 0.25–0.35 | | [STD5](/materials/ks/std5 "STD5") Indicative | Tool steels for hot work | 0.25–0.35 | | [STD6](/materials/ks/std6 "STD6") | — | 0.32–0.42 | | [STD6](/materials/ks/std6 "STD6") Indicative | Tool steels for hot work | 0.33–0.41 | | [STD61](/materials/ks/std61 "STD61") | — | 0.35–0.42 | | [STD61](/materials/ks/std61 "STD61") Indicative | Tool steels for hot work | 0.35–0.42 | | [STD62](/materials/ks/std62 "STD62") | — | 0.32–0.4 | | [STD7](/materials/ks/std7 "STD7") | — | 0.28–0.35 | | [STD8](/materials/ks/std8 "STD8") | — | 0.35–0.45 | | [STF3](/materials/ks/stf3 "STF3") | — | 0.5–0.6 | | [STF4](/materials/ks/stf4 "STF4") | — | 0.5–0.6 | | [STF4](/materials/ks/stf4 "STF4") Indicative | Tool steels for cold work | 0.5–0.6 | | [STF6](/materials/ks/stf6 "STF6") | — | 0.4–0.5 | | [STH330](/materials/ks/sth330 "STH330") | — | ≤ 0.15 | | [STH446](/materials/ks/sth446 "STH446") | — | ≤ 0.2 | | [STH660](/materials/ks/sth660 "STH660") | — | ≤ 0.08 | | [STHA12](/materials/ks/stha12 "STHA12") | — | 0.1–0.2 | | [STHA13](/materials/ks/stha13 "STHA13") | — | 0.15–0.25 | | [STHA20](/materials/ks/stha20 "STHA20") | — | 0.1–0.2 | | [STHA20](/materials/ks/stha20 "STHA20") Indicative | Case hardening steels | 0.13–0.17 | | [STHA20](/materials/ks/stha20 "STHA20") Indicative | Heat-resistant structural steels | 0.08–0.18 | **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/ks/page/8 "Previous") Page 9 of 17[Next](/materials/ks/page/10 "Next")