--- title: "B366 — 19 equivalent grades, compared" description: "The designation B366 is carried by 19 different grades. Compare them on the elements that actually differ, then open the one your print means." canonical: https://steelequivalents.com/materials/astm/b366 language: en robots: index, follow og_type: website type: material-detail language_alternates: en: https://steelequivalents.com/materials/astm/b366.md cs: https://steelequivalents.com/cs/materiály/astm/b366.md de: https://steelequivalents.com/de/werkstoffe/astm/b366.md es: https://steelequivalents.com/es/materiales/astm/b366.md fr: https://steelequivalents.com/fr/matériaux/astm/b366.md hu: https://steelequivalents.com/hu/anyagok/astm/b366.md it: https://steelequivalents.com/it/materiali/astm/b366.md nl: https://steelequivalents.com/nl/materialen/astm/b366.md pl: https://steelequivalents.com/pl/materiały/astm/b366.md pt: https://steelequivalents.com/pt/materiais/astm/b366.md ru: https://steelequivalents.com/ru/материалы/astm/b366.md tr: https://steelequivalents.com/tr/malzemeler/astm/b366.md zh: https://steelequivalents.com/zh/材料/astm/b366.md ja: https://steelequivalents.com/ja/材料/astm/b366.md ar: https://steelequivalents.com/ar/المواد/astm/b366.md ko: https://steelequivalents.com/ko/재료/astm/b366.md pt-br: https://steelequivalents.com/pt-br/materiais/astm/b366.md hi: https://steelequivalents.com/hi/सामग्री/astm/b366.md content_hash: sha256:20d77aec8a573bbdda81e1842a8ed1aa9e83d662d7a89285f033f14be5d43303 generated: 2026-09-24 --- > **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/astm/b366 > Canonical URL: https://steelequivalents.com/materials/astm/b366 > 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. ASTM · United States · 19 grades # B366 The designation B366 is carried by 19 different grades. Compare them on the elements that actually differ, then open the one your print means. - *Matching grades* **19** - [*Category* **Others · 1754 grades**](/categories/others "Category: Others · 1754 grades") - [*Category* **Stainless steels · 468 grades**](/categories/stainless-steels "Category: Stainless steels · 468 grades") - [*Category* **Heat resistant steels · 64 grades**](/categories/heat-resistant-steels "Category: Heat resistant steels · 64 grades") - [*Category* **Nickel and cobalt alloys · 87 grades**](/categories/nickel-and-cobalt-alloys "Category: Nickel and cobalt alloys · 87 grades") - [*Category* **High-temperature steels · 40 grades**](/categories/high-temperature-steels "Category: High-temperature steels · 40 grades") [Search](/search "Steel grade search")[Inquiry](/inquiry "Inquiry") ## Which of the 19 do you want? This name is carried by several grades. The elements shown are the ones whose values actually differ across the set — the ones that decide the question. Values are the source text verbatim; an em dash means no value on file for that element on that grade, not zero. | Grade | Material no. | Category | Designations | Cr% | C% | Ni% | Fe% | Cu% | Mo% | |---|---|---|---|---|---|---|---|---|---| | [X2NiCrMoN25-21-7](/materials/din-en/x2nicrmon25-21-7 "X2NiCrMoN25-21-7") | [1.4478](/materials/material-no/1.4478 "1.4478") 1.4 | [Others](/categories/others "Others") | 18 | 20,0-22,0 | ≤0,03 | 23,5-25,5 | — | ≤0,75 | 6,00-7,00 | | [NO8367](/materials/din-en/no8367 "NO8367") | [1.4529](/materials/material-no/1.4529 "1.4529") 1.4 | [Stainless steels](/categories/stainless-steels "Stainless steels") | 28 | 19,0-21,0 | ≤0,02 | 24,0-26,0 | — | 0,50-1,50 | 6,00-7,00 | | [X10NiCrAlTi32-20](/materials/din-en/x10nicralti32-20 "X10NiCrAlTi32-20") | [1.4876](/materials/material-no/1.4876 "1.4876") 1.4 | [Heat resistant steels](/categories/heat-resistant-steels "Heat resistant steels") | 46 | 19,0-23,0 | ≤0,12 | 30,0-34,0 | — | — | — | | [Ni 99,6](/materials/din-en/ni-99-6 "Ni 99,6") | [2.4060](/materials/material-no/2.4060 "2.4060") 2.4 | [Nickel and cobalt alloys](/categories/nickel-and-cobalt-alloys "Nickel and cobalt alloys") | 17 | — | ≤0,08 | ≥99,6 | ≤0,25 | ≤0,15 | — | | [Ni 99,2](/materials/din-en/ni-99-2 "Ni 99,2") | [2.4066](/materials/material-no/2.4066 "2.4066") 2.4 | [Nickel and cobalt alloys](/categories/nickel-and-cobalt-alloys "Nickel and cobalt alloys") | 43 | — | ≤0,10 | ≥99,2 | ≤0,40 | ≤0,25 | — | | [NiCr21Mo14W](/materials/din-en/nicr21mo14w "NiCr21Mo14W") | [2.4602](/materials/material-no/2.4602 "2.4602") 2.4 | [Nickel and cobalt alloys](/categories/nickel-and-cobalt-alloys "Nickel and cobalt alloys") | 19 | 20,0-22,5 | ≤0,010 | Rest/Bal. | 2,00-6,00 | — | 12,5-14,5 | | [NiCr30FeMo](/materials/din-en/nicr30femo "NiCr30FeMo") | [2.4603](/materials/material-no/2.4603 "2.4603") 2.4 | [Nickel and cobalt alloys](/categories/nickel-and-cobalt-alloys "Nickel and cobalt alloys") | 16 | 28,0-31,5 | ≤0,03 | Rest/Bal. | 13,0-17,0 | 1,00-2,40 | 4,00-6,00 | | [SG-NiCr21Fe18Mo](/materials/din-en/sg-nicr21fe18mo "SG-NiCr21Fe18Mo") | [2.4613](/materials/material-no/2.4613 "2.4613") 2.4 | [Others](/categories/others "Others") | 16 | 20,0-23,0 | ≤0,10 | Rest/Bal. | 17,0-20,0 | — | 8,00-10,0 | | [NiMo28](/materials/din-en/nimo28 "NiMo28") | [2.4617](/materials/material-no/2.4617 "2.4617") 2.4 | [Nickel and cobalt alloys](/categories/nickel-and-cobalt-alloys "Nickel and cobalt alloys") | 16 | ≤1,00 | ≤0,010 | Rest/Bal. | ≤2,00 | ≤0,50 | 26,0-30,0 | | [NiCr25FeAlY](/materials/din-en/nicr25fealy "NiCr25FeAlY") | [2.4633](/materials/material-no/2.4633 "2.4633") 2.4 | [Nickel and cobalt alloys](/categories/nickel-and-cobalt-alloys "Nickel and cobalt alloys") | 15 | 24,0-26,0 | 0,15-0,25 | Rest/Bal. | 8,00-11,0 | ≤0,10 | — | | [NiCr20CuMo](/materials/din-en/nicr20cumo "NiCr20CuMo") | [2.4660](/materials/material-no/2.4660 "2.4660") 2.4 | [Nickel and cobalt alloys](/categories/nickel-and-cobalt-alloys "Nickel and cobalt alloys") | 15 | 19,0-21,0 | ≤0,07 | 32,0-38,0 | Rest/Bal. | 3,00-4,00 | 2,00-3,00 | | [NiCr22Fe18Mo](/materials/din-en/nicr22fe18mo "NiCr22Fe18Mo") | [2.4665](/materials/material-no/2.4665 "2.4665") 2.4 | [High-temperature steels](/categories/high-temperature-steels "High-temperature steels") | 26 | 20,5-23,0 | 0,05-0,15 | Rest/Bal. | 17,0-20,0 | ≤0,50 | 8,00-10,0 | | [NiCr22W14Mo](/materials/din-en/nicr22w14mo "NiCr22W14Mo") | [2.4733](/materials/material-no/2.4733 "2.4733") 2.4 | [Others](/categories/others "Others") | 16 | 20,0-24,0 | 0,05-0,15 | Rest/Bal. | 3 | ≤0,50 | 1,00-3,00 | | [NiCr15Fe](/materials/din-en/nicr15fe "NiCr15Fe") | [2.4816](/materials/material-no/2.4816 "2.4816") 2.4 | [High-temperature steels](/categories/high-temperature-steels "High-temperature steels") | 20 | 14,0-17,0 | 0,05-0,10 | ≥72,0 | 6,00-10,0 | ≤0,50 | — | | [NiMo16Cr15W](/materials/din-en/nimo16cr15w "NiMo16Cr15W") | [2.4819](/materials/material-no/2.4819 "2.4819") 2.4 | [Nickel and cobalt alloys](/categories/nickel-and-cobalt-alloys "Nickel and cobalt alloys") | 13 | 14,5-16,5 | ≤0,010 | Rest/Bal. | 4,00-7,00 | ≤0,50 | 15,0-17,0 | | [NiCr22Mo9Nb](/materials/din-en/nicr22mo9nb "NiCr22Mo9Nb") | [2.4856](/materials/material-no/2.4856 "2.4856") 2.4 | [Heat resistant steels](/categories/heat-resistant-steels "Heat resistant steels") | 24 | 20,0-23,0 | 0,03-0,10 | ≥58,0 | ≤5,00 | ≤0,50 | 8,00-10,0 | | [NiCr21Mo](/materials/din-en/nicr21mo "NiCr21Mo") | [2.4858](/materials/material-no/2.4858 "2.4858") 2.4 | [Nickel and cobalt alloys](/categories/nickel-and-cobalt-alloys "Nickel and cobalt alloys") | 18 | 19,5-23,5 | ≤0,025 | 38,0-46,0 | Rest/Bal. | 1,50-3,00 | 2,50-3,50 | | [NiCr22Fe18Mo](/materials/din-en/nicr22fe18mo "NiCr22Fe18Mo") | [Ni 6002](/materials/material-no/ni-6002 "Ni 6002") | [Others](/categories/others "Others") | 16 | 20,0-23,0 | 0,05-0,15 | ≥45,0 | 17,0-20,0 | ≤0,50 | 8,00-10,0 | | [NiCr21Fe18Mo9](/materials/din-en/nicr21fe18mo9 "NiCr21Fe18Mo9") | [Ni 6002](/materials/material-no/ni-6002 "Ni 6002") | [Others](/categories/others "Others") | 16 | 20,5-23,0 | 0,05-0,15 | ≥44,0 | 17,0-20,0 | ≤0,50 | 8,00-10,0 | ## Not sure which one your print means? Search the catalogue by designation, material number or composition — every name on this page is itself a way in. [Search](/search "Steel grade search")[Inquiry](/inquiry "Inquiry")