--- title: "1.1157 — Quenched and tempered steels" description: "1.1157 is the material number of the grade also listed as 40Mn4. Category: Quenched and tempered steels. Designations recorded for this grade: 15." canonical: https://steelequivalents.com/materials/material-no/1.1157 language: en robots: index, follow og_type: website type: material-detail language_alternates: en: https://steelequivalents.com/materials/material-no/1.1157.md cs: https://steelequivalents.com/cs/materiály/číslo-materiálu/1.1157.md de: https://steelequivalents.com/de/werkstoffe/werkstoff-nr/1.1157.md es: https://steelequivalents.com/es/materiales/número-de-material/1.1157.md fr: https://steelequivalents.com/fr/matériaux/numéro-de-matériau/1.1157.md hu: https://steelequivalents.com/hu/anyagok/anyagszám/1.1157.md it: https://steelequivalents.com/it/materiali/numero-materiale/1.1157.md nl: https://steelequivalents.com/nl/materialen/materiaalnummer/1.1157.md pl: https://steelequivalents.com/pl/materiały/numer-materiału/1.1157.md pt: https://steelequivalents.com/pt/materiais/número-do-material/1.1157.md ru: https://steelequivalents.com/ru/материалы/номер-материала/1.1157.md tr: https://steelequivalents.com/tr/malzemeler/malzeme-numarası/1.1157.md zh: https://steelequivalents.com/zh/材料/材料编号/1.1157.md ja: https://steelequivalents.com/ja/材料/材料番号/1.1157.md ar: https://steelequivalents.com/ar/المواد/رقم-المادة/1.1157.md ko: https://steelequivalents.com/ko/재료/재료번호/1.1157.md pt-br: https://steelequivalents.com/pt-br/materiais/número-do-material/1.1157.md hi: https://steelequivalents.com/hi/सामग्री/सामग्री-संख्या/1.1157.md content_hash: sha256:4521ecb318c36456112307e29240060fc5a1dcb726bc45f0b6fed229ea6f4c17 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/material-no/1.1157 > Canonical URL: https://steelequivalents.com/materials/material-no/1.1157 > 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. Material number · Europe · 15 designations # 1.1157 1.1157 is the material number of the grade also listed as 40Mn4. It is a material in the category Quenched and tempered steels. We list 15 designations recorded for this grade, in the standards DIN / EN, UNS, AISI / SAE, ASTM, BS, AFNOR, JIS, GB, GOST and SS. - ***Material no.* **1.1157**** - [*Category* **Quenched and tempered steels · 133 grades**](/categories/quenched-and-tempered-steels "Category: Quenched and tempered steels · 133 grades") - *Designations* **15** [Search](/search "Steel grade search")[Inquiry](/inquiry?material=71bdbb2b-e5fb-40c9-8799-acbdcd619f9f "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/material-no/1.1157.pdf "Datasheet as PDF") ## If you came for one of these The most-used names for this grade. - [DIN / EN 40Mn4 This grade’s own name](/materials/din-en/40mn4 "DIN / EN 40Mn4") - [UNS G10390 This grade’s own name · 2 grades on that route](/materials/uns/g10390 "UNS G10390") - [AISI / SAE 1039 This grade’s own name · 2 grades on that route](/materials/aisi-sae/1039 "AISI / SAE 1039") ## 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 15 designations · 10 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 - **1.1157 Indicative** - [40Mn4 This grade’s own name](/materials/din-en/40mn4 "DIN / EN 40Mn4") UNS United States · 1 - [G10390 This grade’s own name](/materials/uns/g10390 "UNS G10390") AISI / SAE United States · 1 - [1039 This grade’s own name](/materials/aisi-sae/1039 "AISI / SAE 1039") ASTM United States · 2 - [040 Indicative](/materials/astm/040 "ASTM 040") - [361 Indicative](/materials/astm/361 "ASTM 361") BS United Kingdom · 3 - [080A40 Indicative](/materials/bs/080a40 "BS 080A40") - [150M36 Indicative](/materials/bs/150m36 "BS 150M36") - [EN15 Indicative](/materials/bs/en15 "BS EN15") AFNOR France · 2 - [35M5 Indicative](/materials/afnor/35m5 "AFNOR 35M5") - [40M5 Indicative](/materials/afnor/40m5 "AFNOR 40M5") JIS Japan · 1 - [S40C Indicative](/materials/jis/s40c "JIS S40C") GB China · 1 - [40Mn Indicative](/materials/gb/40mn "GB 40Mn") GOST Russia / CIS · 1 - [40Г Indicative](/materials/gost/40g "GOST 40Г") SS Sweden · 1 - [40Mn Indicative](/materials/gb/40mn "SS 40Mn") Every designation on file is listed — no truncation, no “+ n more”. Each one is itself a route that leads back here. ## Chemical composition 5 elements on file · weight % What this alloy is Fe Mn C Si Iron — the balance, never listed by a standard — 98.2 % Mn — 1 % C — 0.4 % Si — 0.4 % Traces & impurities · 0.1 % Logarithmic scale, 0.01 % to 100 % — every value here compares directly, decade by decade. | Element | % by weight | |---|---| | C | 0.36–0.44 | | Si | 0.25–0.5 | | Mn | 0.8–1.1 | | P | 0.035 | | S | 0.035 | Carbon Silicon Manganese Phosphorus Sulfur 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 | 0,36-0,44 | 0.360 | 0.440 | Range | | Si | 0,25-0,50 | 0.250 | 0.500 | Range | | P | 0,035 | 0.035 | 0.035 | Exact | | S | 0,035 | 0.035 | 0.035 | Exact | | Mn | 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: Ni, Cr, 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. ## Heat treatment Supply condition - Annealing and Tempering and Normalizing Supply condition - Normalizing and Quenching and Tempering Test specimen size d=25 - Normalizing and Quenching and Tempering Test specimen size d=25 Conditions the standard permits on delivery. No temperature or medium is published for these, so no order and no alternation is implied. Source: [www.caishuku.com](https://www.caishuku.com/detail/azhlNWIxMzM3Mg__ "Source: www.caishuku.com") ## Similar grades — and why Selection rule, stated so you can disagree with it: same number class 1.1, a shared category, and a published range for Mn / Si 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. [90Mn4 1.1273 Mn 0,90-1,10 · Si 0,25-0,50 - ΔMn 0.05 - ΔSi 0.00 - 3 designations](/materials/din-en/90mn4 "90Mn4")[90Mn4 1.1819 Mn 0,90-1,10 · Si 0,25-0,50 - ΔMn 0.05 - ΔSi 0.00 - 1 designations](/materials/din-en/90mn4 "90Mn4")[75Mn4 1.1243 Mn ~0,90 · Si ~0,40 - ΔMn 0.05 - ΔSi 0.03 - 1 designations](/materials/din-en/75mn4 "75Mn4")[56Mn4 1.1233 Mn 0,90-1,20 · Si ≤0,40 - ΔMn 0.10 - ΔSi 0.18 - 13 designations](/materials/din-en/56mn4 "56Mn4")[1.1203 1.1203 Mn 0,60-0,90 · Si ≤0,40 - ΔMn 0.20 - ΔSi 0.18 - 32 designations](/materials/material-no/1.1203 "1.1203")[C50E 1.1206 Mn 0,60-0,90 · Si ≤0,40 - ΔMn 0.20 - ΔSi 0.18 - 33 designations](/materials/din-en/c50e "C50E") ## 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=71bdbb2b-e5fb-40c9-8799-acbdcd619f9f "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/material-no/1.1157.pdf "Datasheet as PDF")