--- title: "UNS steel grades — 2038 designations — Page 24" description: "Steel grades designated under UNS, with chemical composition, mechanical properties and equivalents in other standards. 2038 designations across…" canonical: https://steelequivalents.com/materials/uns/page/24 language: en robots: index, follow og_type: website type: material-standard language_alternates: en: https://steelequivalents.com/materials/uns/page/24.md cs: https://steelequivalents.com/cs/materiály/uns.md de: https://steelequivalents.com/de/werkstoffe/uns.md es: https://steelequivalents.com/es/materiales/uns.md fr: https://steelequivalents.com/fr/matériaux/uns.md hu: https://steelequivalents.com/hu/anyagok/uns.md it: https://steelequivalents.com/it/materiali/uns.md nl: https://steelequivalents.com/nl/materialen/uns.md pl: https://steelequivalents.com/pl/materiały/uns.md pt: https://steelequivalents.com/pt/materiais/uns.md ru: https://steelequivalents.com/ru/материалы/uns.md tr: https://steelequivalents.com/tr/malzemeler/uns.md zh: https://steelequivalents.com/zh/材料/uns.md ja: https://steelequivalents.com/ja/材料/uns.md ar: https://steelequivalents.com/ar/المواد/uns.md ko: https://steelequivalents.com/ko/재료/uns.md pt-br: https://steelequivalents.com/pt-br/materiais/uns.md hi: https://steelequivalents.com/hi/सामग्री/uns.md content_hash: sha256:96ad9890a4870cce7cf70a8ff89374c85928437589efe13629f1827f4e8b9761 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/uns/page/24 > Canonical URL: https://steelequivalents.com/materials/uns/page/24 > 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. UNS · 2,038 grades # UNS steel grades — 2038 designations — Page 24 Every grade designated under UNS, 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. 22 of 50 rows differ and carry an “Indicative” mark. ## Also known as 2038 designations | Grade | Material no. | Category | C% by weight | Also in other standards | |---|---|---|---|---| | [K21590](/materials/uns/k21590 "K21590") | [1.7383](/materials/material-no/1.7383 "1.7383") | Heat-resistant structural steels | 0.08–0.15 | 9 | | [K21604](/materials/uns/k21604 "K21604") Indicative | [1.8881](/materials/material-no/1.8881 "1.8881") | Others | ≤ 0.2 | 1 | | [K21604](/materials/uns/k21604 "K21604") Indicative | [1.8907](/materials/material-no/1.8907 "1.8907") | Fine-grain structural steels | ≤ 0.21 | 1 | | [K21604](/materials/uns/k21604 "K21604") Indicative | [1.8917](/materials/material-no/1.8917 "1.8917") | Fine-grain structural steels | ≤ 0.21 | 1 | | [K21604](/materials/uns/k21604 "K21604") Indicative | [1.8928](/materials/material-no/1.8928 "1.8928") | High-strength steels | ≤ 0.2 | 7 | | [K21604](/materials/uns/k21604 "K21604") Indicative | [1.8937](/materials/material-no/1.8937 "1.8937") | Fine-grain structural steels | ≤ 0.21 | 1 | | [K21650](/materials/uns/k21650 "K21650") Indicative | [1.8881](/materials/material-no/1.8881 "1.8881") | Others | ≤ 0.2 | 1 | | [K21650](/materials/uns/k21650 "K21650") Indicative | [1.8907](/materials/material-no/1.8907 "1.8907") | Fine-grain structural steels | ≤ 0.21 | 1 | | [K21650](/materials/uns/k21650 "K21650") Indicative | [1.8917](/materials/material-no/1.8917 "1.8917") | Fine-grain structural steels | ≤ 0.21 | 1 | | [K21650](/materials/uns/k21650 "K21650") Indicative | [1.8928](/materials/material-no/1.8928 "1.8928") | High-strength steels | ≤ 0.2 | 7 | | [K21650](/materials/uns/k21650 "K21650") Indicative | [1.8937](/materials/material-no/1.8937 "1.8937") | Fine-grain structural steels | ≤ 0.21 | 1 | | [K21703](/materials/uns/k21703 "K21703") Indicative | [1.5622](/materials/material-no/1.5622 "1.5622") | Low-temperature structural steels | ≤ 0.18 | 6 | | [K21703](/materials/uns/k21703 "K21703") Indicative | [1.5635](/materials/material-no/1.5635 "1.5635") | Low-temperature structural steels | ≤ 0.15 | 1 | | [K21903](/materials/uns/k21903 "K21903") | [1.6227](/materials/material-no/1.6227 "1.6227") | Others | 0.08–0.14 | 1 | | [K22033](/materials/uns/k22033 "K22033") | [1.5710](/materials/material-no/1.5710 "1.5710") | Quenched and tempered steels | 0.32–0.4 | 14 | | [K22033](/materials/uns/k22033 "K22033") Indicative | [1.5815](/materials/material-no/1.5815 "1.5815") | Others | 0.3–0.37 | 5 | | [K22033](/materials/uns/k22033 "K22033") Indicative | [1.5711](/materials/material-no/1.5711 "1.5711") | Others | 0.38–0.43 | 8 | | [K22094](/materials/uns/k22094 "K22094") | [1.7339](/materials/material-no/1.7339 "1.7339") | Others | 0.09–0.14 | 1 | | [K22103](/materials/uns/k22103 "K22103") | [1.5622](/materials/material-no/1.5622 "1.5622") | Low-temperature structural steels | ≤ 0.18 | 6 | | [K23028](/materials/uns/k23028 "K23028") | [1.6565](/materials/material-no/1.6565 "1.6565") | Quenched and tempered steels | 0.35–0.45 | 15 | | [K23080](/materials/uns/k23080 "K23080") Indicative | [1.2057](/materials/material-no/1.2057 "1.2057") | Tool steels for cold work | 1–1.1 | 4 | | [K23080](/materials/uns/k23080 "K23080") Indicative | [1.2067](/materials/material-no/1.2067 "1.2067") | Tool steels for cold work | 0.95–1.1 | 21 | | [K23080](/materials/uns/k23080 "K23080") Indicative | [1.3505](/materials/material-no/1.3505 "1.3505") | Bearing steels | 0.93–1.05 | 22 | | [K23080](/materials/uns/k23080 "K23080") | — | — | — | 3 | | [K23280](/materials/uns/k23280 "K23280") | [1.8545](/materials/material-no/1.8545 "1.8545") | Others | 0.29–0.36 | 1 | | [K23510](/materials/uns/k23510 "K23510") | [1.8507](/materials/material-no/1.8507 "1.8507") | Nitriding steels | 0.3–0.37 | 8 | | [K23550](/materials/uns/k23550 "K23550") | [1.6586](/materials/material-no/1.6586 "1.6586") | Others | 0.26–0.34 | 1 | | [K23745](/materials/uns/k23745 "K23745") | [1.8506](/materials/material-no/1.8506 "1.8506") | Nitriding steels | 0.3–0.37 | 1 | | [K24064](/materials/uns/k24064 "K24064") | [1.6562](/materials/material-no/1.6562 "1.6562") | Quenched and tempered steels | 0.37–0.44 | 10 | | [K24065](/materials/uns/k24065 "K24065") Indicative | [1.8509](/materials/material-no/1.8509 "1.8509") | Nitriding steels | 0.38–0.45 | 16 | | [K24065](/materials/uns/k24065 "K24065") Indicative | [1.8514](/materials/material-no/1.8514 "1.8514") | Special steels for aviation and aerospace | 0.26–0.34 | 1 | | [K24340](/materials/uns/k24340 "K24340") | [1.7765](/materials/material-no/1.7765 "1.7765") | Special steels for defense technology | 0.3–0.35 | 1 | | [K24340](/materials/uns/k24340 "K24340") Indicative | [1.8522](/materials/material-no/1.8522 "1.8522") | Others | 0.29–0.36 | 2 | | [K24728](/materials/uns/k24728 "K24728") | [1.8509](/materials/material-no/1.8509 "1.8509") | Nitriding steels | 0.38–0.45 | 16 | | [K31390](/materials/uns/k31390 "K31390") | [1.7767](/materials/material-no/1.7767 "1.7767") | Others | 0.1–0.15 | 1 | | [K31545](/materials/uns/k31545 "K31545") | [1.7381](/materials/material-no/1.7381 "1.7381") | Others | 0.06–0.15 | 1 | | [K31718](/materials/uns/k31718 "K31718") | [1.5637](/materials/material-no/1.5637 "1.5637") | Low-temperature structural steels | ≤ 0.15 | 11 | | [K31718](/materials/uns/k31718 "K31718") | [1.5639](/materials/material-no/1.5639 "1.5639") | Low-temperature structural steels | 0.12–0.19 | 9 | | [K31830](/materials/uns/k31830 "K31830") | [1.7767](/materials/material-no/1.7767 "1.7767") | Others | 0.1–0.15 | 1 | | [K31835](/materials/uns/k31835 "K31835") Indicative | [1.7703](/materials/material-no/1.7703 "1.7703") | Others | 0.11–0.15 | 1 | | [K31835](/materials/uns/k31835 "K31835") Indicative | [1.7767](/materials/material-no/1.7767 "1.7767") | Others | 0.1–0.15 | 1 | | [K31918](/materials/uns/k31918 "K31918") | [1.5637](/materials/material-no/1.5637 "1.5637") | Low-temperature structural steels | ≤ 0.15 | 11 | | [K31918](/materials/uns/k31918 "K31918") | [1.5639](/materials/material-no/1.5639 "1.5639") | Low-temperature structural steels | 0.12–0.19 | 9 | | [K32018](/materials/uns/k32018 "K32018") | [1.5637](/materials/material-no/1.5637 "1.5637") | Low-temperature structural steels | ≤ 0.15 | 11 | | [K32018](/materials/uns/k32018 "K32018") | [1.5639](/materials/material-no/1.5639 "1.5639") | Low-temperature structural steels | 0.12–0.19 | 9 | | [K32025](/materials/uns/k32025 "K32025") | [1.5637](/materials/material-no/1.5637 "1.5637") | Low-temperature structural steels | ≤ 0.15 | 11 | | [K32025](/materials/uns/k32025 "K32025") | [1.5639](/materials/material-no/1.5639 "1.5639") | Low-temperature structural steels | 0.12–0.19 | 9 | | [K32026](/materials/uns/k32026 "K32026") | [1.5639](/materials/material-no/1.5639 "1.5639") | Low-temperature structural steels | 0.12–0.19 | 9 | | [K32045](/materials/uns/k32045 "K32045") | [1.6742](/materials/material-no/1.6742 "1.6742") | Quenched and tempered steels | 0.17–0.25 | 1 | | [K32550](/materials/uns/k32550 "K32550") | — | — | — | 2 | **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/uns/page/23 "Previous") Page 24 of 41[Next](/materials/uns/page/25 "Next")