--- title: "IS steel grades — 111 designations" description: "Steel grades designated under IS, with chemical composition, mechanical properties and equivalents in other standards. 111 designations across 111…" canonical: https://steelequivalents.com/materials/is language: en robots: index, follow og_type: website type: material-standard language_alternates: en: https://steelequivalents.com/materials/is.md cs: https://steelequivalents.com/cs/materiály/is.md de: https://steelequivalents.com/de/werkstoffe/is.md es: https://steelequivalents.com/es/materiales/is.md fr: https://steelequivalents.com/fr/matériaux/is.md hu: https://steelequivalents.com/hu/anyagok/is.md it: https://steelequivalents.com/it/materiali/is.md nl: https://steelequivalents.com/nl/materialen/is.md pl: https://steelequivalents.com/pl/materiały/is.md pt: https://steelequivalents.com/pt/materiais/is.md ru: https://steelequivalents.com/ru/материалы/is.md tr: https://steelequivalents.com/tr/malzemeler/is.md zh: https://steelequivalents.com/zh/材料/is.md ja: https://steelequivalents.com/ja/材料/is.md ar: https://steelequivalents.com/ar/المواد/is.md ko: https://steelequivalents.com/ko/재료/is.md pt-br: https://steelequivalents.com/pt-br/materiais/is.md hi: https://steelequivalents.com/hi/सामग्री/is.md content_hash: sha256:e3049e2315b5d9d9c7a05f4ca5dbb6db8a91e591f8a31f3aab1772f1ee9e5b2a generated: 2026-09-22 --- > **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/is > Canonical URL: https://steelequivalents.com/materials/is > 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. IS · 111 grades # IS steel grades — 111 designations Every grade designated under IS, with the identifying and comparative data we hold for each. Open a grade for its full composition, properties and its designations in other standards. Every name on this page is recorded in our sources as this standard’s own designation for the grade. ## Also known as 111 designations | Grade | C% by weight | |---|---| | [165](/materials/is/165 "165") | ≤ 0.12 | | [205](/materials/is/205 "205") | ≤ 0.15 | | [235](/materials/is/235 "235") | ≤ 0.17 | | [255](/materials/is/255 "255") | ≤ 0.2 | | [325](/materials/is/325 "325") | ≤ 0.2 | | [355](/materials/is/355 "355") | ≤ 0.2 | | [420](/materials/is/420 "420") | ≤ 0.2 | | [490](/materials/is/490 "490") | ≤ 0.2 | | [560](/materials/is/560 "560") | ≤ 0.2 | | [C15](/materials/is/c15 "C15") | 0.12–0.18 | | [C15 A](/materials/is/c15-a "C15 A") | 0.12–0.18 | | [C15 B](/materials/is/c15-b "C15 B") | 0.12–0.18 | | [C15 C](/materials/is/c15c "C15 C") | 0.12–0.18 | | [C15 HMn A](/materials/is/c15-hmn-a "C15 HMn A") | 0.12–0.18 | | [C15 HMn B](/materials/is/c15-hmn-b "C15 HMn B") | 0.12–0.18 | | [C15 HMn C](/materials/is/c15-hmn-c "C15 HMn C") | 0.12–0.18 | | [C15 MMn A](/materials/is/c15-mmn-a "C15 MMn A") | 0.12–0.18 | | [C15 MMn B](/materials/is/c15-mmn-b "C15 MMn B") | 0.12–0.18 | | [C15 MMn C](/materials/is/c15-mmn-c "C15 MMn C") | 0.12–0.18 | | [C18 A](/materials/is/c18-a "C18 A") | 0.15–0.21 | | [C18 B](/materials/is/c18-b "C18 B") | 0.15–0.21 | | [C18 C](/materials/is/c18-c "C18 C") | 0.15–0.21 | | [C18 HMn A](/materials/is/c18-hmn-a "C18 HMn A") | 0.15–0.21 | | [C18 HMn B](/materials/is/c18-hmn-b "C18 HMn B") | 0.15–0.21 | | [C18 HMn C](/materials/is/c18-hmn-c "C18 HMn C") | 0.15–0.21 | | [C18 MMn A](/materials/is/c18-mmn-a "C18 MMn A") | 0.15–0.21 | | [C18 MMn B](/materials/is/c18-mmn-b "C18 MMn B") | 0.15–0.21 | | [C18 MMn C](/materials/is/c18-mmn-c "C18 MMn C") | 0.15–0.21 | | [C20 A](/materials/is/c20-a "C20 A") | 0.17–0.23 | | [C20 B](/materials/is/c20-b "C20 B") | 0.17–0.23 | | [C20 C](/materials/is/c20c "C20 C") | 0.17–0.23 | | [C20 HMn A](/materials/is/c20-hmn-a "C20 HMn A") | 0.17–0.23 | | [C20 HMn B](/materials/is/c20-hmn-b "C20 HMn B") | 0.17–0.23 | | [C20 HMn C](/materials/is/c20-hmn-c "C20 HMn C") | 0.17–0.23 | | [C20 MMn A](/materials/is/c20-mmn-a "C20 MMn A") | 0.17–0.23 | | [C20 MMn B](/materials/is/c20-mmn-b "C20 MMn B") | 0.17–0.23 | | [C20 MMn C](/materials/is/c20-mmn-c "C20 MMn C") | 0.17–0.23 | | [C22](/materials/is/c22 "C22") | ≤ 0.25 | | [C8](/materials/is/c8 "C8") | ≤ 0.15 | | [CR0](/materials/is/cr0 "CR0") | ≤ 0.25 | | [CR1](/materials/is/cr1 "CR1") | ≤ 0.15 | | [CR2](/materials/is/cr2 "CR2") | ≤ 0.12 | | [CR3](/materials/is/cr3 "CR3") | ≤ 0.1 | | [CR4](/materials/is/cr4 "CR4") | ≤ 0.08 | | [CR5](/materials/is/cr5 "CR5") | ≤ 0.06 | | [E165](/materials/is/e165 "E165") | ≤ 0.25 | | [E170](/materials/is/e170 "E170") | ≤ 0.25 | | [E215](/materials/is/e215 "E215") | ≤ 0.25 | | [E250A](/materials/is/e250a "E250A") | ≤ 0.23 | | [E250B0](/materials/is/e250b0 "E250B0") | ≤ 0.22 | **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. Page 1 of 3[Next](/materials/is/page/2 "Next")