--- title: "STAS steel grades — 203 designations — Page 3" description: "Steel grades designated under STAS, with chemical composition, mechanical properties and equivalents in other standards. 203 designations across 142…" canonical: https://steelequivalents.com/materials/stas/page/3 language: en robots: index, follow og_type: website type: material-standard language_alternates: en: https://steelequivalents.com/materials/stas/page/3.md cs: https://steelequivalents.com/cs/materiály/stas.md de: https://steelequivalents.com/de/werkstoffe/stas.md es: https://steelequivalents.com/es/materiales/stas.md fr: https://steelequivalents.com/fr/matériaux/stas.md hu: https://steelequivalents.com/hu/anyagok/stas.md it: https://steelequivalents.com/it/materiali/stas.md nl: https://steelequivalents.com/nl/materialen/stas.md pl: https://steelequivalents.com/pl/materiały/stas.md pt: https://steelequivalents.com/pt/materiais/stas.md ru: https://steelequivalents.com/ru/материалы/stas.md tr: https://steelequivalents.com/tr/malzemeler/stas.md zh: https://steelequivalents.com/zh/材料/stas.md ja: https://steelequivalents.com/ja/材料/stas.md ar: https://steelequivalents.com/ar/المواد/stas.md ko: https://steelequivalents.com/ko/재료/stas.md pt-br: https://steelequivalents.com/pt-br/materiais/stas.md hi: https://steelequivalents.com/hi/सामग्री/stas.md content_hash: sha256:8df9e72bf0cb5d39f31a7ed4d4fc1592ac4ca677dd9313ed81fd93d44714e5bd 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/stas/page/3 > Canonical URL: https://steelequivalents.com/materials/stas/page/3 > 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. STAS · 203 grades # STAS steel grades — 203 designations — Page 3 Every grade designated under STAS, 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. Every name on this page is an indicative cross-reference, not an asserted identity: the grades are close, not interchangeable. Check the composition before you substitute. ## Also known as 203 designations | Grade | Material no. | Category | C% by weight | Also in other standards | |---|---|---|---|---| | [OL32.1](/materials/stas/ol32-1 "OL32.1") | [1.0035](/materials/material-no/1.0035 "1.0035") | Unalloyed structural steels | — | 22 | | [OL34.1](/materials/stas/ol34-1 "OL34.1") | [1.0034](/materials/material-no/1.0034 "1.0034") | Unalloyed structural steels | ≤ 0.15 | 12 | | [OL37.1](/materials/stas/ol37-1 "OL37.1") | [1.0038](/materials/material-no/1.0038 "1.0038") | Unalloyed structural steels | ≤ 0.17 | 26 | | [OL37.1](/materials/stas/ol37-1 "OL37.1") | [1.0036](/materials/material-no/1.0036 "1.0036") | Unalloyed structural steels | ≤ 0.17 | 20 | | [OL37.1](/materials/stas/ol37-1 "OL37.1") | [1.0036](/materials/material-no/1.0036 "1.0036") | Unalloyed structural steels | ≤ 0.17 | 19 | | [OL37.2](/materials/stas/ol37-2 "OL37.2") | [1.0038](/materials/material-no/1.0038 "1.0038") | Unalloyed structural steels | ≤ 0.17 | 26 | | [OL37.4](/materials/stas/ol37-4 "OL37.4") | [1.0038](/materials/material-no/1.0038 "1.0038") | Unalloyed structural steels | ≤ 0.17 | 26 | | [OL37.4](/materials/stas/ol37-4 "OL37.4") | [1.0028](/materials/material-no/1.0028 "1.0028") | Unalloyed structural steels | ≤ 0.15 | 18 | | [OL42.1](/materials/stas/ol42-1 "OL42.1") | [1.0144](/materials/material-no/1.0144 "1.0144") | Unalloyed structural steels | ≤ 0.18 | 22 | | [OL42.1](/materials/stas/ol42-1 "OL42.1") | [1.0044](/materials/material-no/1.0044 "1.0044") | Unalloyed structural steels | ≤ 0.21 | 26 | | [OL44.2](/materials/stas/ol44-2 "OL44.2") | [1.0044](/materials/material-no/1.0044 "1.0044") | Unalloyed structural steels | ≤ 0.21 | 26 | | [OL44.3](/materials/stas/ol44-3 "OL44.3") | [1.0426](/materials/material-no/1.0426 "1.0426") | Aging resistant steels | 0.08–0.2 | 17 | | [OL44.3](/materials/stas/ol44-3 "OL44.3") | [1.0425](/materials/material-no/1.0425 "1.0425") | Heat-resistant structural steels | ≤ 0.2 | 20 | | [OL50.1](/materials/stas/ol50-1 "OL50.1") | [1.0050](/materials/material-no/1.0050 "1.0050") | Unalloyed structural steels | — | 23 | | [OL50.1](/materials/stas/ol50-1 "OL50.1") | [1.0050](/materials/material-no/1.0050 "1.0050") | Unalloyed structural steels | — | 23 | | [OL52.3](/materials/stas/ol52-3 "OL52.3") | [1.0570](/materials/material-no/1.0570 "1.0570") | Unalloyed structural steels | ≤ 0.2 | 22 | | [OL52.3](/materials/stas/ol52-3 "OL52.3") | [1.0570](/materials/material-no/1.0570 "1.0570") | Unalloyed structural steels | ≤ 0.2 | 20 | | [OL52.4](/materials/stas/ol52-4 "OL52.4") | [1.0570](/materials/material-no/1.0570 "1.0570") | Unalloyed structural steels | ≤ 0.2 | 22 | | [OL52.4](/materials/stas/ol52-4 "OL52.4") | [1.0570](/materials/material-no/1.0570 "1.0570") | Unalloyed structural steels | ≤ 0.2 | 20 | | [OL60.1k](/materials/stas/ol60-1k "OL60.1k") | [1.0060](/materials/material-no/1.0060 "1.0060") | Unalloyed structural steels | — | 21 | | [OL60.1k](/materials/stas/ol60-1k "OL60.1k") | [1.0060](/materials/material-no/1.0060 "1.0060") | Unalloyed structural steels | — | 21 | | [OLC 75A](/materials/stas/olc-75a "OLC 75A") | [1.1248](/materials/material-no/1.1248 "1.1248") | Spring steels | 0.7–0.8 | 11 | | [OLC 75A](/materials/stas/olc-75a "OLC 75A") | [1.0605](/materials/material-no/1.0605 "1.0605") | Spring steels | 0.7–0.8 | 11 | | [OLC 75A](/materials/stas/olc-75a "OLC 75A") | [1.2003](/materials/material-no/1.2003 "1.2003") | Tool steels for cold work | 0.7–0.8 | 9 | | [OLC10](/materials/stas/olc10 "OLC10") | [1.0301](/materials/material-no/1.0301 "1.0301") | Case hardening steels | 0.07–0.13 | 20 | | [OLC10X](/materials/stas/olc10x "OLC10X") | [1.1121](/materials/material-no/1.1121 "1.1121") | Case hardening steels | 0.07–0.13 | 22 | | [OLC15](/materials/stas/olc15 "OLC15") | [1.0401](/materials/material-no/1.0401 "1.0401") | Case hardening steels | 0.12–0.18 | 23 | | [OLC15](/materials/stas/olc15 "OLC15") | [1.1141](/materials/material-no/1.1141 "1.1141") | Case hardening steels | 0.12–0.18 | 20 | | [OLC15AT](/materials/stas/olc15at "OLC15AT") | [1.0401](/materials/material-no/1.0401 "1.0401") | Case hardening steels | 0.12–0.18 | 23 | | [OLC15X](/materials/stas/olc15x "OLC15X") | [1.0401](/materials/material-no/1.0401 "1.0401") | Case hardening steels | 0.12–0.18 | 23 | | [OLC20](/materials/stas/olc20 "OLC20") | [1.0402](/materials/material-no/1.0402 "1.0402") | Quenched and tempered steels | 0.17–0.24 | 24 | | [OLC20X](/materials/stas/olc20x "OLC20X") | [1.0402](/materials/material-no/1.0402 "1.0402") | Quenched and tempered steels | 0.17–0.24 | 24 | | [OLC25](/materials/stas/olc25 "OLC25") | [1.0406](/materials/material-no/1.0406 "1.0406") | Quenched and tempered steels | 0.22–0.29 | 20 | | [OLC25q](/materials/stas/olc25q "OLC25q") | [1.0406](/materials/material-no/1.0406 "1.0406") | Quenched and tempered steels | 0.22–0.29 | 20 | | [OLC25X](/materials/stas/olc25x "OLC25X") | [1.0406](/materials/material-no/1.0406 "1.0406") | Quenched and tempered steels | 0.22–0.29 | 20 | | [OLC30](/materials/stas/olc30 "OLC30") | [1.0528](/materials/material-no/1.0528 "1.0528") | Quenched and tempered steels | 0.27–0.34 | 14 | | [OLC35](/materials/stas/olc35 "OLC35") | [1.0501](/materials/material-no/1.0501 "1.0501") | Quenched and tempered steels | 0.32–0.39 | 23 | | [OLC35AS](/materials/stas/olc35as "OLC35AS") | [1.0501](/materials/material-no/1.0501 "1.0501") | Quenched and tempered steels | 0.32–0.39 | 23 | | [OLC35q](/materials/stas/olc35q "OLC35q") | [1.0501](/materials/material-no/1.0501 "1.0501") | Quenched and tempered steels | 0.32–0.39 | 23 | | [OLC35X](/materials/stas/olc35x "OLC35X") | [1.0501](/materials/material-no/1.0501 "1.0501") | Quenched and tempered steels | 0.32–0.39 | 23 | | [OLC35X](/materials/stas/olc35x "OLC35X") | [1.1181](/materials/material-no/1.1181 "1.1181") | Quenched and tempered steels | 0.32–0.39 | 20 | | [OLC35X](/materials/stas/olc35x "OLC35X") | [1.1180](/materials/material-no/1.1180 "1.1180") | Quenched and tempered steels | 0.32–0.39 | 11 | | [OLC40](/materials/stas/olc40 "OLC40") | [1.0511](/materials/material-no/1.0511 "1.0511") | Quenched and tempered steels | 0.37–0.44 | 21 | | [OLC40X](/materials/stas/olc40x "OLC40X") | [1.0511](/materials/material-no/1.0511 "1.0511") | Quenched and tempered steels | 0.37–0.44 | 21 | | [OLC45](/materials/stas/olc45 "OLC45") | [1.0503](/materials/material-no/1.0503 "1.0503") | Quenched and tempered steels | 0.42–0.5 | 24 | | [OLC45q](/materials/stas/olc45q "OLC45q") | [1.0503](/materials/material-no/1.0503 "1.0503") | Quenched and tempered steels | 0.42–0.5 | 24 | | [OLC45X](/materials/stas/olc45x "OLC45X") | [1.0503](/materials/material-no/1.0503 "1.0503") | Quenched and tempered steels | 0.42–0.5 | 24 | | [OLC50AT](/materials/stas/olc50at "OLC50AT") | [1.0535](/materials/material-no/1.0535 "1.0535") | Quenched and tempered steels | 0.52–0.6 | 21 | | [OLC50X](/materials/stas/olc50x "OLC50X") | [1.0535](/materials/material-no/1.0535 "1.0535") | Quenched and tempered steels | 0.52–0.6 | 21 | | [OLC50X](/materials/stas/olc50x "OLC50X") | [1.0540](/materials/material-no/1.0540 "1.0540") | Quenched and tempered steels | 0.47–0.55 | 13 | **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/stas/page/2 "Previous") Page 3 of 5[Next](/materials/stas/page/4 "Next")