--- title: "KS steel grades — 823 designations — Page 6" 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/6 language: en robots: index, follow og_type: website type: material-standard language_alternates: en: https://steelequivalents.com/materials/ks/page/6.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: sha256:8e4862a91076f4cad92051bb8c393429d86c656054794b384c28e07abaedca2c 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/6 > Canonical URL: https://steelequivalents.com/materials/ks/page/6 > 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 6 Every grade designated under KS, 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. 15 of 50 rows differ and carry an “Indicative” mark. ## Also known as 823 designations | Grade | Material no. | Category | C% by weight | Also in other standards | |---|---|---|---|---| | [SL9N590](/materials/jis/sl9n590 "SL9N590") | — | Low-temperature structural steels | ≤ 0.12 | 1 | | [SLAI235](/materials/ks/slai235 "SLAI235") | — | Low-temperature structural steels | ≤ 0.15 | — | | [SLAI325](/materials/ks/slai325 "SLAI325") | — | Low-temperature structural steels | ≤ 0.16 | — | | [SLAI360](/materials/ks/slai360 "SLAI360") | — | Low-temperature structural steels | ≤ 0.18 | — | | [SM10C](/materials/ks/sm10c "SM10C") | — | — | 0.08–0.13 | — | | [SM10C](/materials/ks/sm10c "SM10C") Indicative | [1.1121](/materials/material-no/1.1121 "1.1121") | Case hardening steels | 0.07–0.13 | 22 | | [SM12C](/materials/ks/sm12c "SM12C") | — | — | 0.1–0.15 | — | | [SM15C](/materials/ks/sm15c "SM15C") | — | — | 0.13–0.18 | — | | [SM15C](/materials/ks/sm15c "SM15C") Indicative | [1.0401](/materials/material-no/1.0401 "1.0401") | Case hardening steels | 0.12–0.18 | 23 | | [SM15CK](/materials/ks/sm15ck "SM15CK") Indicative | [1.0401](/materials/material-no/1.0401 "1.0401") | Case hardening steels | 0.12–0.18 | 23 | | [SM17C](/materials/ks/sm17c "SM17C") | — | — | 0.15–0.2 | — | | [SM20C](/materials/ks/sm20c "SM20C") | — | — | 0.18–0.23 | — | | [SM20C](/materials/ks/sm20c "SM20C") Indicative | [1.0402](/materials/material-no/1.0402 "1.0402") | Quenched and tempered steels | 0.17–0.24 | 24 | | [SM20CK](/materials/ks/sm20ck "SM20CK") Indicative | [1.0402](/materials/material-no/1.0402 "1.0402") | Quenched and tempered steels | 0.17–0.24 | 24 | | [SM22C](/materials/ks/sm22c "SM22C") | — | — | 0.2–0.25 | — | | [SM22C](/materials/ks/sm22c "SM22C") Indicative | [1.0402](/materials/material-no/1.0402 "1.0402") | Quenched and tempered steels | 0.17–0.24 | 24 | | [SM25C](/materials/ks/sm25c "SM25C") | — | — | 0.22–0.28 | — | | [SM25C](/materials/ks/sm25c "SM25C") Indicative | [1.0406](/materials/material-no/1.0406 "1.0406") | Quenched and tempered steels | 0.22–0.29 | 20 | | [SM28C](/materials/ks/sm28c "SM28C") | — | — | 0.25–0.31 | — | | [SM28C](/materials/ks/sm28c "SM28C") Indicative | [1.0406](/materials/material-no/1.0406 "1.0406") | Quenched and tempered steels | 0.22–0.29 | 20 | | [SM30C](/materials/ks/sm30c "SM30C") | — | — | 0.27–0.33 | — | | [SM33C](/materials/ks/sm33c "SM33C") | — | — | 0.3–0.36 | — | | [SM35C](/materials/ks/sm35c "SM35C") | — | — | 0.32–0.38 | — | | [SM35C](/materials/ks/sm35c "SM35C") Indicative | [1.0501](/materials/material-no/1.0501 "1.0501") | Quenched and tempered steels | 0.32–0.39 | 23 | | [SM38C](/materials/ks/sm38c "SM38C") | — | — | 0.35–0.41 | — | | [SM38C](/materials/ks/sm38c "SM38C") Indicative | [1.0501](/materials/material-no/1.0501 "1.0501") | Quenched and tempered steels | 0.32–0.39 | 23 | | [SM400A](/materials/ks/sm400a "SM400A") | [1.0144](/materials/material-no/1.0144 "1.0144") | Unalloyed structural steels | ≤ 0.18 | 22 | | [SM400B](/materials/ks/sm400b "SM400B") | [1.0490](/materials/material-no/1.0490 "1.0490") | Fine-grain structural steels | ≤ 0.18 | 6 | | [SM400C](/materials/ks/sm400c "SM400C") | [1.0144](/materials/material-no/1.0144 "1.0144") | Unalloyed structural steels | ≤ 0.18 | 22 | | [SM40C](/materials/ks/sm40c "SM40C") | — | — | 0.37–0.43 | — | | [SM40C](/materials/ks/sm40c "SM40C") Indicative | [1.0511](/materials/material-no/1.0511 "1.0511") | Quenched and tempered steels | 0.37–0.44 | 21 | | [SM43C](/materials/ks/sm43c "SM43C") | — | — | 0.4–0.46 | — | | [SM45C](/materials/ks/sm45c "SM45C") | — | — | 0.42–0.48 | — | | [SM45C](/materials/ks/sm45c "SM45C") Indicative | [1.0503](/materials/material-no/1.0503 "1.0503") | Quenched and tempered steels | 0.42–0.5 | 24 | | [SM48C](/materials/ks/sm48c "SM48C") | — | — | 0.45–0.51 | — | | [SM48C](/materials/ks/sm48c "SM48C") Indicative | [1.0503](/materials/material-no/1.0503 "1.0503") | Quenched and tempered steels | 0.42–0.5 | 24 | | [SM490A](/materials/ks/sm490a "SM490A") | [1.8902](/materials/material-no/1.8902 "1.8902") | Fine-grain structural steels | ≤ 0.2 | 19 | | [SM490B](/materials/ks/sm490b "SM490B") | [1.0562](/materials/material-no/1.0562 "1.0562") | Fine-grain structural steels | ≤ 0.18 | 18 | | [SM490C](/materials/ks/sm490c "SM490C") | [1.8902](/materials/material-no/1.8902 "1.8902") | Fine-grain structural steels | ≤ 0.2 | 19 | | [SM490YA](/materials/jis/sm490ya "SM490YA") | — | Unalloyed structural steels | ≤ 0.2 | 1 | | [SM490YB](/materials/ks/sm490yb "SM490YB") | [1.0595](/materials/material-no/1.0595 "1.0595") | Others | ≤ 0.2 | 7 | | [SM50C](/materials/ks/sm50c "SM50C") | — | — | 0.47–0.53 | — | | [SM50C](/materials/ks/sm50c "SM50C") Indicative | [1.0535](/materials/material-no/1.0535 "1.0535") | Quenched and tempered steels | 0.52–0.6 | 21 | | [SM520B](/materials/ks/sm520b "SM520B") | [1.0596](/materials/material-no/1.0596 "1.0596") | Unalloyed structural steels | ≤ 0.2 | 4 | | [SM520C](/materials/jis/sm520c "SM520C") | — | Unalloyed structural steels | ≤ 0.2 | 1 | | [SM53C](/materials/ks/sm53c "SM53C") | [1.0426](/materials/material-no/1.0426 "1.0426") | Aging resistant steels | 0.08–0.2 | 17 | | [SM55C](/materials/ks/sm55c "SM55C") | — | — | 0.52–0.58 | — | | [SM55C](/materials/ks/sm55c "SM55C") Indicative | [1.0535](/materials/material-no/1.0535 "1.0535") | Quenched and tempered steels | 0.52–0.6 | 21 | | [SM570](/materials/jis/sm570 "SM570") | — | Unalloyed structural steels | ≤ 0.18 | 1 | | [SM58C](/materials/ks/sm58c "SM58C") | — | — | 0.55–0.61 | — | **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/5 "Previous") Page 6 of 17[Next](/materials/ks/page/7 "Next")