--- title: "B166 — 9 equivalent grades, compared" description: "The designation B166 is carried by 9 different grades. Compare them on the elements that actually differ, then open the one your print means." canonical: https://steelequivalents.com/materials/astm/b166 language: en robots: index, follow og_type: website type: material-detail language_alternates: en: https://steelequivalents.com/materials/astm/b166.md cs: https://steelequivalents.com/cs/materiály/astm/b166.md de: https://steelequivalents.com/de/werkstoffe/astm/b166.md es: https://steelequivalents.com/es/materiales/astm/b166.md fr: https://steelequivalents.com/fr/matériaux/astm/b166.md hu: https://steelequivalents.com/hu/anyagok/astm/b166.md it: https://steelequivalents.com/it/materiali/astm/b166.md nl: https://steelequivalents.com/nl/materialen/astm/b166.md pl: https://steelequivalents.com/pl/materiały/astm/b166.md pt: https://steelequivalents.com/pt/materiais/astm/b166.md ru: https://steelequivalents.com/ru/материалы/astm/b166.md tr: https://steelequivalents.com/tr/malzemeler/astm/b166.md zh: https://steelequivalents.com/zh/材料/astm/b166.md ja: https://steelequivalents.com/ja/材料/astm/b166.md ar: https://steelequivalents.com/ar/المواد/astm/b166.md ko: https://steelequivalents.com/ko/재료/astm/b166.md pt-br: https://steelequivalents.com/pt-br/materiais/astm/b166.md hi: https://steelequivalents.com/hi/सामग्री/astm/b166.md content_hash: sha256:b026cd60d5c94a81e934840fa0dc664b9ca86a3840cd8bc29d61fb27be284517 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/b166 > Canonical URL: https://steelequivalents.com/materials/astm/b166 > 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 · 9 grades # B166 The designation B166 is carried by 9 different grades. Compare them on the elements that actually differ, then open the one your print means. - *Matching grades* **9** - [*Category* **Others · 1754 grades**](/categories/others "Category: Others · 1754 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") - [*Category* **Heat resistant steels · 64 grades**](/categories/heat-resistant-steels "Category: Heat resistant steels · 64 grades") [Search](/search "Steel grade search")[Inquiry](/inquiry "Inquiry") ## Which of the 9 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 | Fe% | C% | Cr% | Al% | Ti% | Ni% | |---|---|---|---|---|---|---|---|---|---| | [SG-NiCr23Al](/materials/din-en/sg-nicr23al "SG-NiCr23Al") | [2.4626](/materials/material-no/2.4626 "2.4626") 2.4 | [Others](/categories/others "Others") | 9 | ≤18,0 | ≤0,10 | 21,0-25,0 | 1,00-1,70 | ≤0,50 | 58,0-63,0 | | [SG-NiCr22Co12Mo](/materials/din-en/sg-nicr22co12mo "SG-NiCr22Co12Mo") | [2.4627](/materials/material-no/2.4627 "2.4627") 2.4 | [Others](/categories/others "Others") | 6 | ≤2,00 | ≤0,10 | 20,0-24,0 | 0,80-1,50 | ≤0,60 | ≥50,0 | | [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 | 8,00-11,0 | 0,15-0,25 | 24,0-26,0 | 1,80-2,40 | 0,10-0,20 | Rest/Bal. | | [NiCr23Co12Mo](/materials/din-en/nicr23co12mo "NiCr23Co12Mo") | [2.4663](/materials/material-no/2.4663 "2.4663") 2.4 | [Nickel and cobalt alloys](/categories/nickel-and-cobalt-alloys "Nickel and cobalt alloys") | 18 | ≤2,00 | 0,05-0,10 | 20,0-23,0 | 0,70-1,40 | 0,20-0,60 | Rest/Bal. | | [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 | 6,00-10,0 | 0,05-0,10 | 14,0-17,0 | ≤0,30 | ≤0,30 | ≥72,0 | | [NiCr23Fe](/materials/din-en/nicr23fe "NiCr23Fe") | [2.4851](/materials/material-no/2.4851 "2.4851") 2.4 | [Heat resistant steels](/categories/heat-resistant-steels "Heat resistant steels") | 21 | ≤18,0 | 0,03-0,10 | 21,0-25,0 | 1,00-1,70 | ≤0,50 | 58,0-63,0 | | [NiCr20Ti](/materials/din-en/nicr20ti "NiCr20Ti") | [2.4951](/materials/material-no/2.4951 "2.4951") 2.4 | [High-temperature steels](/categories/high-temperature-steels "High-temperature steels") | 16 | ≤5,00 | 0,08-0,15 | 18,0-21,0 | ≤0,30 | 0,20-0,60 | Rest/Bal. | | [NiCr23Fe15Al](/materials/din-en/nicr23fe15al "NiCr23Fe15Al") | [Ni 6601](/materials/material-no/ni-6601 "Ni 6601") | [Others](/categories/others "Others") | 9 | ≤20,0 | ≤0,10 | 21,0-25,0 | 1,00-1,70 | — | 58,0-63,0 | | [NiCr22Co12Mo9](/materials/din-en/nicr22co12mo9 "NiCr22Co12Mo9") | [Ni 6617](/materials/material-no/ni-6617 "Ni 6617") | [Others](/categories/others "Others") | 6 | ≤3,00 | 0,05-0,15 | 20,0-24,0 | 0,80-1,50 | ≤0,60 | ≥44,0 | ## 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")