--- title: "B 637 — 9 equivalent grades, compared" description: "The designation B 637 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/b637 language: en robots: index, follow og_type: website type: material-detail language_alternates: en: https://steelequivalents.com/materials/astm/b637.md cs: https://steelequivalents.com/cs/materiály/astm/b637.md de: https://steelequivalents.com/de/werkstoffe/astm/b637.md es: https://steelequivalents.com/es/materiales/astm/b637.md fr: https://steelequivalents.com/fr/matériaux/astm/b637.md hu: https://steelequivalents.com/hu/anyagok/astm/b637.md it: https://steelequivalents.com/it/materiali/astm/b637.md nl: https://steelequivalents.com/nl/materialen/astm/b637.md pl: https://steelequivalents.com/pl/materiały/astm/b637.md pt: https://steelequivalents.com/pt/materiais/astm/b637.md ru: https://steelequivalents.com/ru/материалы/astm/b637.md tr: https://steelequivalents.com/tr/malzemeler/astm/b637.md zh: https://steelequivalents.com/zh/材料/astm/b637.md ja: https://steelequivalents.com/ja/材料/astm/b637.md ar: https://steelequivalents.com/ar/المواد/astm/b637.md ko: https://steelequivalents.com/ko/재료/astm/b637.md pt-br: https://steelequivalents.com/pt-br/materiais/astm/b637.md hi: https://steelequivalents.com/hi/सामग्री/astm/b637.md content_hash: sha256:4474d1d7b9d4525b9764a01173dae5dd9060bebaa24dfe24f770815ad5caf6fd 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/b637 > Canonical URL: https://steelequivalents.com/materials/astm/b637 > 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 # B 637 The designation B 637 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* **High-temperature steels / aviation variant · 12 grades**](/categories/high-temperature-steels-aviation-variant "Category: High-temperature steels / aviation variant · 12 grades") - [*Category* **Nickel and cobalt alloys · 87 grades**](/categories/nickel-and-cobalt-alloys "Category: Nickel and cobalt alloys · 87 grades") - [*Category* **Resistance heating alloys · 9 grades**](/categories/resistance-heating-alloys "Category: Resistance heating alloys · 9 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 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% | Al% | Ti% | C% | Si% | Co% | |---|---|---|---|---|---|---|---|---|---| | [NiCr20TiAl](/materials/din-en/nicr20tial "NiCr20TiAl") | [2.4631](/materials/material-no/2.4631 "2.4631") 2.4 | [High-temperature steels / aviation variant](/categories/high-temperature-steels-aviation-variant "High-temperature steels / aviation variant") | 11 | ≤1,50 | 1,00-1,80 | 1,80-2,70 | 0,04-0,10 | ≤1,00 | ≤2,00 | | [NiCo20Cr15MoAlTi](/materials/din-en/nico20cr15moalti "NiCo20Cr15MoAlTi") | [2.4634](/materials/material-no/2.4634 "2.4634") 2.4 | [High-temperature steels / aviation variant](/categories/high-temperature-steels-aviation-variant "High-temperature steels / aviation variant") | 7 | ≤1,00 | 4,50-4,90 | 0,90-1,50 | 0,12-0,17 | ≤1,00 | 18,0-22,0 | | [NiCr19Co14Mo4Ti](/materials/din-en/nicr19co14mo4ti "NiCr19Co14Mo4Ti") | [2.4654](/materials/material-no/2.4654 "2.4654") 2.4 | [Nickel and cobalt alloys](/categories/nickel-and-cobalt-alloys "Nickel and cobalt alloys") | 17 | ≤2,00 | 1,20-1,60 | 2,80-3,30 | 0,02-0,10 | ≤0,15 | 12,0-15,0 | | [SG-NiCr19NbMoTi](/materials/din-en/sg-nicr19nbmoti "SG-NiCr19NbMoTi") | [2.4667](/materials/material-no/2.4667 "2.4667") 2.4 | [Resistance heating alloys](/categories/resistance-heating-alloys "Resistance heating alloys") | 9 | ≤22,0 | 0,20-0,80 | 0,60-1,20 | ≤0,08 | ≤0,40 | — | | [NiCr19Fe19Nb5Mo3](/materials/din-en/nicr19fe19nb5mo3 "NiCr19Fe19Nb5Mo3") | [2.4668](/materials/material-no/2.4668 "2.4668") 2.4 | [High-temperature steels](/categories/high-temperature-steels "High-temperature steels") | 29 | Rest/Bal. | 0,30-0,70 | 0,60-1,20 | 0,02-0,08 | ≤0,35 | ≤1,00 | | [NiCr15Fe7Ti2Al](/materials/din-en/nicr15fe7ti2al "NiCr15Fe7Ti2Al") | [2.4669](/materials/material-no/2.4669 "2.4669") 2.4 | [High-temperature steels](/categories/high-temperature-steels "High-temperature steels") | 23 | 5,00-9,00 | 0,40-1,00 | 2,25-2,75 | ≤0,08 | ≤0,50 | ≤1,00 | | [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 | ≤0,30 | 0,20-0,60 | 0,08-0,15 | ≤1,00 | ≤5,00 | | [NiCr20TiAl](/materials/din-en/nicr20tial "NiCr20TiAl") | [2.4952](/materials/material-no/2.4952 "2.4952") 2.4 | [High-temperature steels](/categories/high-temperature-steels "High-temperature steels") | 7 | ≤1,50;(Fe≤3,00) | 1,00-1,80 | 1,80-2,70 | 0,04-0,10 | ≤1,00 | ≤1,00;(Co≤2,00) | | [NiCr19Fe19Nb5Mo3](/materials/din-en/nicr19fe19nb5mo3 "NiCr19Fe19Nb5Mo3") | [Ni 7718](/materials/material-no/ni-7718 "Ni 7718") | [Resistance heating alloys](/categories/resistance-heating-alloys "Resistance heating alloys") | 9 | ≤24,0 | 0,20-0,80 | 0,70-1,10 | ≤0,08 | ≤0,30 | — | ## 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")