--- title: "637M17 — Case hardening steels" description: "637M17 in BS: material number 1.5714, also listed as 16NiCr4. Category: Case hardening steels. Designations recorded for this grade: 13." canonical: https://steelequivalents.com/materials/bs/637m17 language: en robots: index, follow og_type: website type: material-detail language_alternates: en: https://steelequivalents.com/materials/bs/637m17.md cs: https://steelequivalents.com/cs/materiály/bs/637m17.md de: https://steelequivalents.com/de/werkstoffe/bs/637m17.md es: https://steelequivalents.com/es/materiales/bs/637m17.md fr: https://steelequivalents.com/fr/matériaux/bs/637m17.md hu: https://steelequivalents.com/hu/anyagok/bs/637m17.md it: https://steelequivalents.com/it/materiali/bs/637m17.md nl: https://steelequivalents.com/nl/materialen/bs/637m17.md pl: https://steelequivalents.com/pl/materiały/bs/637m17.md pt: https://steelequivalents.com/pt/materiais/bs/637m17.md ru: https://steelequivalents.com/ru/материалы/bs/637m17.md tr: https://steelequivalents.com/tr/malzemeler/bs/637m17.md zh: https://steelequivalents.com/zh/材料/bs/637m17.md ja: https://steelequivalents.com/ja/材料/bs/637m17.md ar: https://steelequivalents.com/ar/المواد/bs/637m17.md ko: https://steelequivalents.com/ko/재료/bs/637m17.md pt-br: https://steelequivalents.com/pt-br/materiais/bs/637m17.md hi: https://steelequivalents.com/hi/सामग्री/bs/637m17.md content_hash: sha256:a431709a295ca76e459b6af344459145e6807d2945ee244c857acbf051143c18 generated: 2026-09-22 --- > **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/bs/637m17 > Canonical URL: https://steelequivalents.com/materials/bs/637m17 > 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. BS · United Kingdom · 13 designations # 637M17 637M17 is a designation in BS for the material held under material number 1.5714, also listed as 16NiCr4. It is a material in the category Case hardening steels. We list 13 designations recorded for this grade, in the standards DIN / EN, AISI / SAE, BS, GOST, UNI, ČSN and PN. - [*Material no.* **1.5714**](/materials/material-no/1.5714 "Material no.: 1.5714") - [*Category* **Case hardening steels · 60 grades**](/categories/case-hardening-steels "Category: Case hardening steels · 60 grades") - *Designations* **13** [Search](/search "Steel grade search")[Inquiry](/inquiry?material=a4cd4555-7320-4937-b329-0af69aef43c6&designation=f74316da-36cd-42be-9b2f-382a135098b6 "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/bs/637m17.pdf "Datasheet as PDF") ## If you came for one of these The most-used names for this grade. - [DIN / EN 16NiCr4 This grade’s own name](/materials/din-en/16nicr4 "DIN / EN 16NiCr4") - [AISI / SAE 3115 This grade’s own name · 4 grades on that route](/materials/aisi-sae/3115 "AISI / SAE 3115") ## About Case hardening steels Case hardening steels are steels designed to develop a hard, wear-resistant surface while retaining a tough and ductile core. They are used for components such as gears, shafts and other machine parts exposed to contact wear and cyclic loading. This describes the material class as a whole. Always confirm the individual grade against the standard before ordering. ## Also known as 13 designations · 7 standards · nothing hidden 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. DIN / EN Europe · 1 - [16NiCr4 This grade’s own name](/materials/din-en/16nicr4 "DIN / EN 16NiCr4") AISI / SAE United States · 2 - [3115 This grade’s own name](/materials/aisi-sae/3115 "AISI / SAE 3115") - [A3115 Indicative](/materials/aisi-sae/a3115 "AISI / SAE A3115") BS United Kingdom · 2 - [637H17 Indicative](/materials/bs/637h17 "BS 637H17") - **637M17 Indicative** GOST Russia / CIS · 4 - [18ChGN1 Indicative](/materials/gost/18chgn1 "GOST 18ChGN1") - [18KhGN1 Indicative](/materials/gost/18khgn1 "GOST 18KhGN1") - [19ChGN Indicative](/materials/gost/19chgn "GOST 19ChGN") - [19KhGN Indicative](/materials/gost/19khgn "GOST 19KhGN") UNI Italy · 1 - [16CrNi4 Indicative](/materials/uni/16crni4 "UNI 16CrNi4") ČSN Czechia · 1 - [16 121 Indicative](/materials/csn/16-121 "ČSN 16 121") PN Poland · 2 - [15HGN Indicative](/materials/pn/15hgn "PN 15HGN") - [17HGN Indicative](/materials/pn/17hgn "PN 17HGN") Every designation on file is listed — no truncation, no “+ n more”. Each one is itself a route that leads back here. ## Chemical composition 7 elements on file · weight % What this alloy is Fe Ni Mn Cr Iron — the balance, never listed by a standard — 96.8 % Ni — 1 % Mn — 0.9 % Cr — 0.8 % Traces & impurities · 0.6 % Logarithmic scale, 0.01 % to 100 % — every value here compares directly, decade by decade. | Element | % by weight | |---|---| | C | 0.13–0.19 | | Si | ≤ 0.4 | | Mn | 0.7–1 | | P | 0.025 | | S | 0.035 | | Cr | 0.6–1 | | Ni | 0.8–1.1 | Carbon Silicon Manganese Phosphorus Sulfur Chromium Nickel 0.01 % 0.1 % 1 % 10 % 100 % The scale is logarithmic, not the element’s raw share of the alloy — the only honest way to fit 0.01 % and 100 % in one picture, and it means every value here can be compared with every other. | Element | As published source text, verbatim | Min% by weight | Max% by weight | Bound | |---|---|---|---|---| | C | 0,13-0,19 | 0.130 | 0.190 | Range | | Si | ≤0,40 | — | 0.400 | Max | | P | 0,025 | 0.025 | 0.025 | Exact | | S | 0,035 | 0.035 | 0.035 | Exact | | Cr | 0,60-1,00 | 0.600 | 1.000 | Range | | Mn | 0,70-1,00 | 0.700 | 1.000 | Range | | Ni | 0,80-1,10 | 0.800 | 1.100 | Range | The published column is the source string byte-for-byte, decimal comma and all; Min and Max are the parsed bounds. Elements not listed have no value on file — they are omitted, never inferred. ## Predicted transformation temperatures Not enough recorded composition to predict a transformation temperature for this grade — missing: Mo. ## Physical & mechanical properties Density 7,85 g/cm³ Exact An absent property means we hold no value for it — it is left out rather than estimated, interpolated from a neighbouring grade, or filled from a handbook. It does not mean the property is undefined for the material. ## Properties by condition 4 conditions · 4 values By delivery state**Treated to improve shearability** source `steelnumber` | Delivery state | HB | |---|---| | Treated to improve shearability | 255 | By delivery state**Soft annealed** source `steelnumber` | Delivery state | HB | |---|---| | Soft annealed | 217 | By delivery state**Treated to hardness range** source `steelnumber` | Delivery state | HB | |---|---| | Treated to hardness range | 166 – 217 | By delivery state**Treated to ferrite-pearlite structure and hardness range** source `steelnumber` | Delivery state | HB | |---|---| | Treated to ferrite-pearlite structure and hardness range | 156 – 207 | Every figure holds only for the condition on its own row. Values are never merged across conditions or across sources, never averaged, and never interpolated between two rows. An em dash means no value on file — never zero. Figures are converted to the unit in the column header; the source’s own wording is kept and shown where the two differ. ## Similar grades — and why Selection rule, stated so you can disagree with it: same number class 1.5, a shared category, and a published range for Ni / Mn that overlaps this grade’s. These are neighbours in composition space — they are not equivalents, and none is claimed to be interchangeable with this grade. [16NiCrS4 1.5715 Ni 0,80-1,10 · Mn 0,70-1,00 - ΔNi 0.00 - ΔMn 0.00 - 13 designations](/materials/din-en/16nicrs4 "16NiCrS4") ## Looking for this grade under another name? 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?material=a4cd4555-7320-4937-b329-0af69aef43c6&designation=f74316da-36cd-42be-9b2f-382a135098b6 "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/bs/637m17.pdf "Datasheet as PDF")