--- title: "ISO steel grades — 531 designations — Page 9" description: "Steel grades designated under ISO, with chemical composition, mechanical properties and equivalents in other standards. 531 designations across 327…" canonical: https://steelequivalents.com/materials/iso/page/9 language: en robots: index, follow og_type: website type: material-standard language_alternates: en: https://steelequivalents.com/materials/iso/page/9.md cs: https://steelequivalents.com/cs/materiály/iso.md de: https://steelequivalents.com/de/werkstoffe/iso.md es: https://steelequivalents.com/es/materiales/iso.md fr: https://steelequivalents.com/fr/matériaux/iso.md hu: https://steelequivalents.com/hu/anyagok/iso.md it: https://steelequivalents.com/it/materiali/iso.md nl: https://steelequivalents.com/nl/materialen/iso.md pl: https://steelequivalents.com/pl/materiały/iso.md pt: https://steelequivalents.com/pt/materiais/iso.md ru: https://steelequivalents.com/ru/материалы/iso.md tr: https://steelequivalents.com/tr/malzemeler/iso.md zh: https://steelequivalents.com/zh/材料/iso.md ja: https://steelequivalents.com/ja/材料/iso.md ar: https://steelequivalents.com/ar/المواد/iso.md ko: https://steelequivalents.com/ko/재료/iso.md pt-br: https://steelequivalents.com/pt-br/materiais/iso.md hi: https://steelequivalents.com/hi/सामग्री/iso.md content_hash: sha256:625d5086b6cf6a9e736f68a63e10733fc6ce4d58c4f4c9ba95d22adcab095b0c 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/iso/page/9 > Canonical URL: https://steelequivalents.com/materials/iso/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. ISO · 531 grades # ISO steel grades — 531 designations — Page 9 Every grade designated under ISO, 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 indicative cross-reference, not an asserted identity — the grades are close, not interchangeable. 2 of 50 rows differ and carry a “This grade’s own name” mark. ## Also known as 531 designations | Grade | Material no. | Category | C% by weight | Also in other standards | |---|---|---|---|---| | [NiCr19Fe19Nb5Mo3](/materials/din-en/nicr19fe19nb5mo3 "NiCr19Fe19Nb5Mo3") | [2.4668](/materials/material-no/2.4668 "2.4668") | High-temperature steels | 0.02–0.08 | 10 | | [NiCr20Co13Mo4Ti3Al](/materials/din-en/nicr20co13mo4ti3al "NiCr20Co13Mo4Ti3Al") | [2.4654](/materials/material-no/2.4654 "2.4654") | Nickel and cobalt alloys | 0.02–0.1 | 6 | | [NiCr20Co18Ti3](/materials/din-en/nicr20co18ti3 "NiCr20Co18Ti3") | [2.4632](/materials/material-no/2.4632 "2.4632") | High-temperature steels / aviation variant | ≤ 0.13 | 5 | | [NiCr20Cr20Mo5Ti2Al](/materials/iso/nicr20cr20mo5ti2al "NiCr20Cr20Mo5Ti2Al") | [2.4650](/materials/material-no/2.4650 "2.4650") | Nickel and cobalt alloys | 0.04–0.08 | 5 | | [NiCr20Ti](/materials/din-en/nicr20ti "NiCr20Ti") | [2.4951](/materials/material-no/2.4951 "2.4951") | High-temperature steels | 0.08–0.15 | 6 | | [NiCr20Ti2Al](/materials/iso/nicr20ti2al "NiCr20Ti2Al") | [2.4952](/materials/material-no/2.4952 "2.4952") | High-temperature steels | 0.04–0.1 | 6 | | [NiCr21Fe18Mo9](/materials/din-en/nicr21fe18mo9 "NiCr21Fe18Mo9") | [2.4665](/materials/material-no/2.4665 "2.4665") | High-temperature steels | 0.05–0.15 | 11 | | [NiCr21Mo16W4](/materials/din-en/nicr21mo16w4 "NiCr21Mo16W4") | [2.4606](/materials/material-no/2.4606 "2.4606") | Others | ≤ 0.01 | 3 | | [NiCr22Co12Mo9](/materials/din-en/nicr22co12mo9 "NiCr22Co12Mo9") | [2.4663](/materials/material-no/2.4663 "2.4663") | Nickel and cobalt alloys | 0.05–0.1 | 6 | | [NiCr22Fe20Mo6Cu2Nb](/materials/iso/nicr22fe20mo6cu2nb "NiCr22Fe20Mo6Cu2Nb") | [2.4663](/materials/material-no/2.4663 "2.4663") | Nickel and cobalt alloys | 0.05–0.1 | 6 | | [NiCr22W14Mo](/materials/din-en/nicr22w14mo "NiCr22W14Mo") | [2.4733](/materials/material-no/2.4733 "2.4733") | Others | 0.05–0.15 | 5 | | [NiCr23Fe15Al](/materials/din-en/nicr23fe15al "NiCr23Fe15Al") | [2.4851](/materials/material-no/2.4851 "2.4851") | Heat resistant steels | 0.03–0.1 | 7 | | [NiCr23Mo16](/materials/din-en/nicr23mo16 "NiCr23Mo16") | [2.4605](/materials/material-no/2.4605 "2.4605") | Nickel and cobalt alloys | ≤ 0.01 | 3 | | [NiCr25Fe10AlY](/materials/din-en/nicr25fe10aly "NiCr25Fe10AlY") | [2.4633](/materials/material-no/2.4633 "2.4633") | Nickel and cobalt alloys | 0.15–0.25 | 3 | | [NiCr29Fe](/materials/din-en/nicr29fe "NiCr29Fe") | [2.4642](/materials/material-no/2.4642 "2.4642") | Nickel and cobalt alloys | ≤ 0.05 | 3 | | [NiCr29Fe9](/materials/din-en/nicr29fe9 "NiCr29Fe9") | [2.4642](/materials/material-no/2.4642 "2.4642") | Nickel and cobalt alloys | ≤ 0.05 | 3 | | [NiCu30](/materials/iso/nicu30 "NiCu30") | [2.4360](/materials/material-no/2.4360 "2.4360") | Nickel and cobalt alloys | ≤ 0.15 | 7 | | [NiFe36Cr12Mo6Ti3](/materials/gb/nife36cr12mo6ti3 "NiFe36Cr12Mo6Ti3") | [2.4975](/materials/material-no/2.4975 "2.4975") | High-temperature steels | ≤ 0.1 | 4 | | [NiMo16Cr17Ti](/materials/iso/nimo16cr17ti "NiMo16Cr17Ti") | [2.4610](/materials/material-no/2.4610 "2.4610") | Nickel and cobalt alloys | ≤ 0.015 | 3 | | [NiMo30Cr](/materials/din-en/nimo30cr "NiMo30Cr") | [2.4600](/materials/material-no/2.4600 "2.4600") | Others | ≤ 0.01 | 1 | | [NW0665](/materials/iso/nw0665 "NW0665") | [2.4617](/materials/material-no/2.4617 "2.4617") | Nickel and cobalt alloys | ≤ 0.01 | 4 | | [NW2200](/materials/iso/nw2200 "NW2200") | [2.4066](/materials/material-no/2.4066 "2.4066") | Nickel and cobalt alloys | ≤ 0.1 | 10 | | [NW2200](/materials/iso/nw2200 "NW2200") | [2.4068](/materials/material-no/2.4068 "2.4068") | Nickel and cobalt alloys | ≤ 0.02 | 8 | | [NW2201](/materials/iso/nw2201 "NW2201") | [2.4066](/materials/material-no/2.4066 "2.4066") | Nickel and cobalt alloys | ≤ 0.1 | 10 | | [NW2201](/materials/iso/nw2201 "NW2201") | [2.4068](/materials/material-no/2.4068 "2.4068") | Nickel and cobalt alloys | ≤ 0.02 | 8 | | [NW4400](/materials/iso/nw4400 "NW4400") | [2.4360](/materials/material-no/2.4360 "2.4360") | Nickel and cobalt alloys | ≤ 0.15 | 7 | | [NW5500](/materials/iso/nw5500 "NW5500") | [2.4375](/materials/material-no/2.4375 "2.4375") | Nickel and cobalt alloys | ≤ 0.2 | 6 | | [NW6007](/materials/iso/nw6007 "NW6007") | [2.4663](/materials/material-no/2.4663 "2.4663") | Nickel and cobalt alloys | 0.05–0.1 | 6 | | [NW6017](/materials/iso/nw6017 "NW6017") | [2.4663](/materials/material-no/2.4663 "2.4663") | Nickel and cobalt alloys | 0.05–0.1 | 6 | | [NW6455](/materials/iso/nw6455 "NW6455") | [2.4610](/materials/material-no/2.4610 "2.4610") | Nickel and cobalt alloys | ≤ 0.015 | 3 | | [NW6601](/materials/iso/nw6601 "NW6601") | [2.4851](/materials/material-no/2.4851 "2.4851") | Heat resistant steels | 0.03–0.1 | 7 | | [NW6621](/materials/iso/nw6621 "NW6621") | [2.4951](/materials/material-no/2.4951 "2.4951") | High-temperature steels | 0.08–0.15 | 6 | | [NW6690](/materials/iso/nw6690 "NW6690") | [2.4642](/materials/material-no/2.4642 "2.4642") | Nickel and cobalt alloys | ≤ 0.05 | 3 | | [NW7001](/materials/iso/nw7001 "NW7001") | [2.4654](/materials/material-no/2.4654 "2.4654") | Nickel and cobalt alloys | 0.02–0.1 | 6 | | [NW7090](/materials/iso/nw7090 "NW7090") | [2.4632](/materials/material-no/2.4632 "2.4632") | High-temperature steels / aviation variant | ≤ 0.13 | 5 | | [NW7263](/materials/iso/nw7263 "NW7263") | [2.4650](/materials/material-no/2.4650 "2.4650") | Nickel and cobalt alloys | 0.04–0.08 | 5 | | [NW7718](/materials/iso/nw7718 "NW7718") | [2.4668](/materials/material-no/2.4668 "2.4668") | High-temperature steels | 0.02–0.08 | 10 | | [NW7750](/materials/iso/nw7750 "NW7750") | [2.4669](/materials/material-no/2.4669 "2.4669") | High-temperature steels | ≤ 0.08 | 8 | | [NW8020](/materials/iso/nw8020 "NW8020") | [2.4660](/materials/material-no/2.4660 "2.4660") | Nickel and cobalt alloys | ≤ 0.07 | 4 | | [NW8020](/materials/iso/nw8020 "NW8020") | [1.4527](/materials/material-no/1.4527 "1.4527") | Others | ≤ 0.06 | 3 | | [NW8800](/materials/iso/nw8800 "NW8800") | [1.4876](/materials/material-no/1.4876 "1.4876") | Heat resistant steels | ≤ 0.12 | 12 | | [NW8800](/materials/iso/nw8800 "NW8800") | [1.4958](/materials/material-no/1.4958 "1.4958") | High-temperature steels | 0.03–0.08 | 6 | | [NW8800](/materials/iso/nw8800 "NW8800") | [1.4959](/materials/material-no/1.4959 "1.4959") | High-temperature steels | 0.05–0.1 | 6 | | [NW8800](/materials/iso/nw8800 "NW8800") | [1.4558](/materials/material-no/1.4558 "1.4558") | Stainless steels | ≤ 0.03 | 4 | | [NW9911](/materials/iso/nw9911 "NW9911") | [2.4975](/materials/material-no/2.4975 "2.4975") | High-temperature steels | ≤ 0.1 | 4 | | [P1024Z](/materials/iso/p1024z "P1024Z") This grade’s own name | — | — | — | — | | [P1025Z](/materials/iso/p1025z "P1025Z") This grade’s own name | — | — | — | — | | [P11](/materials/iso/p11 "P11") | [1.0481](/materials/material-no/1.0481 "1.0481") | Heat-resistant structural steels | 0.08–0.2 | 17 | | [P11](/materials/iso/p11 "P11") | [1.0445](/materials/material-no/1.0445 "1.0445") | Higher strength steels | — | 12 | | [P26](/materials/iso/p26 "P26") | [1.5415](/materials/material-no/1.5415 "1.5415") | Heat-resistant structural steels | 0.12–0.2 | 15 | **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/iso/page/8 "Previous") Page 9 of 11[Next](/materials/iso/page/10 "Next")