--- title: "40CrNi12 — Quenched and tempered steels" description: "40CrNi12 in STAS: material number 1.5710, also listed as 36NiCr6. Category: Quenched and tempered steels. Designations recorded for this grade: 26." canonical: https://steelequivalents.com/materials/stas/40crni12 language: en robots: index, follow og_type: website type: material-detail language_alternates: en: https://steelequivalents.com/materials/stas/40crni12.md cs: https://steelequivalents.com/cs/materiály/stas/40crni12.md de: https://steelequivalents.com/de/werkstoffe/stas/40crni12.md es: https://steelequivalents.com/es/materiales/stas/40crni12.md fr: https://steelequivalents.com/fr/matériaux/stas/40crni12.md hu: https://steelequivalents.com/hu/anyagok/stas/40crni12.md it: https://steelequivalents.com/it/materiali/stas/40crni12.md nl: https://steelequivalents.com/nl/materialen/stas/40crni12.md pl: https://steelequivalents.com/pl/materiały/stas/40crni12.md pt: https://steelequivalents.com/pt/materiais/stas/40crni12.md ru: https://steelequivalents.com/ru/материалы/stas/40crni12.md tr: https://steelequivalents.com/tr/malzemeler/stas/40crni12.md zh: https://steelequivalents.com/zh/材料/stas/40crni12.md ja: https://steelequivalents.com/ja/材料/stas/40crni12.md ar: https://steelequivalents.com/ar/المواد/stas/40crni12.md ko: https://steelequivalents.com/ko/재료/stas/40crni12.md pt-br: https://steelequivalents.com/pt-br/materiais/stas/40crni12.md hi: https://steelequivalents.com/hi/सामग्री/stas/40crni12.md content_hash: sha256:b04dcf3854bbaaa5a20282363d86d7df4ea2b73216b05027b0d1a2491c5077ae 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/stas/40crni12 > Canonical URL: https://steelequivalents.com/materials/stas/40crni12 > 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. STAS · Romania · 26 designations # 40CrNi12 40CrNi12 is a designation in STAS for the material held under material number 1.5710, also listed as 36NiCr6. It is a material in the category Quenched and tempered steels. We list 26 designations recorded for this grade, in the standards DIN / EN, UNS, AISI / SAE, ASTM, BS, AFNOR, JIS, GB, GOST, SS, ČSN, SRPS, AS / NZS, STAS and BDS. - [*Material no.* **1.5710**](/materials/material-no/1.5710 "Material no.: 1.5710") - [*Category* **Quenched and tempered steels · 133 grades**](/categories/quenched-and-tempered-steels "Category: Quenched and tempered steels · 133 grades") - *Designations* **26** [Search](/search "Steel grade search")[Inquiry](/inquiry?material=acdb7aba-eed9-47a9-807d-4730bb436820&designation=0361a640-c243-4cc8-b125-2721e51abd17 "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/stas/40crni12.pdf "Datasheet as PDF") ## If you came for one of these The most-used names for this grade. - [UNS K22033 This grade’s own name · 3 grades on that route](/materials/uns/k22033 "UNS K22033") - [AISI / SAE 3135 This grade’s own name · 3 grades on that route](/materials/aisi-sae/3135 "AISI / SAE 3135") ## About Quenched and tempered steels Quenched and tempered steels are heat-treated steels designed to combine high strength with useful toughness and ductility. They are used for heavily loaded components such as shafts, gears, fasteners and structural machine parts where resistance to mechanical stress is required. This describes the material class as a whole. Always confirm the individual grade against the standard before ordering. ## Also known as 26 designations · 15 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 · 2 - [1.5710 Indicative](/materials/material-no/1.5710 "DIN / EN 1.5710") - [36NiCr6 This grade’s own name Withdrawn](/materials/din-en/36nicr6 "DIN / EN 36NiCr6") UNS United States · 1 - [K22033 This grade’s own name](/materials/uns/k22033 "UNS K22033") AISI / SAE United States · 4 - [3135 This grade’s own name](/materials/aisi-sae/3135 "AISI / SAE 3135") - [3140 Indicative](/materials/aisi-sae/3140 "AISI / SAE 3140") - [3140H Indicative](/materials/aisi-sae/3140h "AISI / SAE 3140H") - [G31400 Indicative](/materials/uns/g31400 "AISI / SAE G31400") ASTM United States · 1 - [AMS 6330E Indicative](/materials/astm/ams-6330e "ASTM AMS 6330E") BS United Kingdom · 4 - [111A Indicative](/materials/bs/111a "BS 111A") - [640A35 Indicative](/materials/bs/640a35 "BS 640A35") - [640M40 Indicative](/materials/bs/640m40 "BS 640M40") - [EN111A Indicative](/materials/bs/en111a "BS EN111A") AFNOR France · 2 - [30NC6 Indicative](/materials/afnor/30nc6 "AFNOR 30NC6") - [35NC6 Indicative](/materials/afnor/35nc6 "AFNOR 35NC6") JIS Japan · 1 - [SNC236 Indicative](/materials/jis/snc236 "JIS SNC236") GB China · 1 - [40CrNi Indicative](/materials/gb/40crni "GB 40CrNi") GOST Russia / CIS · 2 - [40KHN Indicative](/materials/gost/40khn "GOST 40KHN") - [40ХН Indicative](/materials/gost/40khn "GOST 40ХН") SS Sweden · 1 - [2530 Indicative](/materials/ss/2530 "SS 2530") ČSN Czechia · 1 - [16240 Indicative](/materials/csn/16240 "ČSN 16240") SRPS Serbia · 1 - [Č.5434 Indicative](/materials/srps/c-5434 "SRPS Č.5434") AS / NZS Australia / New Zealand · 2 - [3140 Indicative](/materials/aisi-sae/3140 "AS / NZS 3140") - [3140H Indicative](/materials/aisi-sae/3140h "AS / NZS 3140H") STAS Romania · 2 - **40CrNi12 Indicative** - [40CrNi12q Indicative](/materials/stas/40crni12q "STAS 40CrNi12q") BDS Bulgaria · 1 - [40ChN Indicative](/materials/bds/40chn "BDS 40ChN") 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 — 96.7 % Ni — 1.5 % Mn — 0.6 % Cr — 0.5 % Traces & impurities · 0.7 % Logarithmic scale, 0.01 % to 100 % — every value here compares directly, decade by decade. | Element | % by weight | |---|---| | C | 0.32–0.4 | | Si | 0.15–0.35 | | Mn | 0.4–0.8 | | P | 0.035 | | S | 0.035 | | Cr | 0.3–0.7 | | Ni | 1.25–1.75 | 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 | 0,32-0,40 | 0.320 | 0.400 | Range | | Si | 0,15-0,35 | 0.150 | 0.350 | Range | | P | 0,035 | 0.035 | 0.035 | Exact | | S | 0,035 | 0.035 | 0.035 | Exact | | Cr | 0,30-0,70 | 0.300 | 0.700 | Range | | Mn | 0,40-0,80 | 0.400 | 0.800 | Range | | Ni | 1,25-1,75 | 1.250 | 1.750 | 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 Transformation point Ac1 735 °C Exact Transformation point Ac3 768 °C Exact · Ac3(Acm) Transformation point Ar3 700 °C Exact · Ar3(Arcm) Transformation point Ar1 660 °C Exact Weldability difficult to weld As published: hard weldability. Flake sensitivity susceptible As published: predisposed Temper brittleness susceptible As published: predisposed 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 3 conditions · 22 values By delivery state**no delivery state stated** source `splav` | Delivery state | HB | |---|---| | (annealing) , GOST 4543-71 | 207 | | Bar GOST 10702-78 | 179 | By dimension**Quenching and drawing** source `splav` | Dimension mm | Rm N/mm² | Re N/mm² | A5% | Z% | KCU kJ/m² | |---|---|---|---|---|---| | Ø 25 | 980 | 785 | 11 | 45 | 690 | At temperature**no delivery state stated** source `splav` | Temperature °C | Density g/cm³ | Elastic modulus GPa | Thermal expansion coefficient 10^-6/K | Thermal conductivity W/(m·K) | |---|---|---|---|---| | 20 | 7.82 | 200 | — | — | | 100 | 7.8 | — | 11.8 | 44 | | 200 | 7.77 | — | 12.3 | 43 | | 300 | 7.74 | — | 13.4 | 41 | | 400 | 7.7 | — | 14 | 39 | | 500 | — | — | — | 37 | 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. ## 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=acdb7aba-eed9-47a9-807d-4730bb436820&designation=0361a640-c243-4cc8-b125-2721e51abd17 "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/stas/40crni12.pdf "Datasheet as PDF")