--- title: "SUM41 — Free cutting steels" description: "SUM41 in KS: material number 1.0764, also listed as 36 SMn 14. It is a material in the category Free cutting steels. Designations recorded for this grade: 5." canonical: https://steelequivalents.com/materials/ks/sum41 language: en robots: index, follow og_type: website type: material-detail language_alternates: en: https://steelequivalents.com/materials/ks/sum41.md cs: https://steelequivalents.com/cs/materiály/ks/sum41.md de: https://steelequivalents.com/de/werkstoffe/ks/sum41.md es: https://steelequivalents.com/es/materiales/ks/sum41.md fr: https://steelequivalents.com/fr/matériaux/ks/sum41.md hu: https://steelequivalents.com/hu/anyagok/ks/sum41.md it: https://steelequivalents.com/it/materiali/ks/sum41.md nl: https://steelequivalents.com/nl/materialen/ks/sum41.md pl: https://steelequivalents.com/pl/materiały/ks/sum41.md pt: https://steelequivalents.com/pt/materiais/ks/sum41.md ru: https://steelequivalents.com/ru/материалы/ks/sum41.md tr: https://steelequivalents.com/tr/malzemeler/ks/sum41.md zh: https://steelequivalents.com/zh/材料/ks/sum41.md ja: https://steelequivalents.com/ja/材料/ks/sum41.md ar: https://steelequivalents.com/ar/المواد/ks/sum41.md ko: https://steelequivalents.com/ko/재료/ks/sum41.md pt-br: https://steelequivalents.com/pt-br/materiais/ks/sum41.md hi: https://steelequivalents.com/hi/सामग्री/ks/sum41.md content_hash: sha256:6f38552ff042d8c017f6f2814bf8bace026eaa40abed927007686eed1ba901be 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/ks/sum41 > Canonical URL: https://steelequivalents.com/materials/ks/sum41 > 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. KS · South Korea · 5 designations # SUM41 SUM41 is a designation in KS for the material held under material number 1.0764, also listed as 36 SMn 14. It is a material in the category Free cutting steels. We list 5 designations recorded for this grade, in the standards DIN / EN, UNS, AISI / SAE, JIS and KS. - [*Material no.* **1.0764**](/materials/material-no/1.0764 "Material no.: 1.0764") - [*Category* **Free cutting steels · 49 grades**](/categories/free-cutting-steels "Category: Free cutting steels · 49 grades") - *Designations* **5** [Search](/search "Steel grade search")[Inquiry](/inquiry?material=cc410a08-e7fe-4cb0-9b3e-0e34daab4bbe&designation=4273d9e6-8670-46ec-a312-8c9d78822b11 "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/ks/sum41.pdf "Datasheet as PDF") ## If you came for one of these The most-used names for this grade. - [DIN / EN 36 SMn 14 This grade’s own name](/materials/din-en/36-smn-14 "DIN / EN 36 SMn 14") - [UNS G11370 This grade’s own name · 2 grades on that route](/materials/uns/g11370 "UNS G11370") - [AISI / SAE 1137 This grade’s own name · 3 grades on that route](/materials/aisi-sae/1137 "AISI / SAE 1137") ## About Free cutting steels Free-cutting steels are steels formulated to machine readily and produce manageable chips during cutting. Their machinability makes them suitable for turned, drilled and threaded components produced in high volumes, including small precision parts and fasteners. This describes the material class as a whole. Always confirm the individual grade against the standard before ordering. ## Also known as 5 designations · 5 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 - [36 SMn 14 This grade’s own name](/materials/din-en/36-smn-14 "DIN / EN 36 SMn 14") UNS United States · 1 - [G11370 This grade’s own name](/materials/uns/g11370 "UNS G11370") AISI / SAE United States · 1 - [1137 This grade’s own name](/materials/aisi-sae/1137 "AISI / SAE 1137") JIS Japan · 1 - **SUM41 Indicative** KS South Korea · 1 - **SUM41 This grade’s own name** 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 Si C Iron — the balance, never listed by a standard — 97.5 % Mn — 1.5 % Si — 0.4 % C — 0.4 % Traces & impurities · 0.2 % Logarithmic scale, 0.01 % to 100 % — every value here compares directly, decade by decade. | Element | % by weight | |---|---| | C | 0.32–0.39 | | Si | ≤ 0.4 | | Mn | 1.3–1.7 | | P | 0.06 | | S | 0.1–0.18 | 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 | 0,32-0,39 | 0.320 | 0.390 | Range | | Si | ≤0,40 | — | 0.400 | Max | | P | 0,06 | 0.060 | 0.060 | Exact | | S | 0,10-0,18 | 0.100 | 0.180 | Range | | Mn | 1,30-1,70 | 1.300 | 1.700 | 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. ## Properties by condition 2 conditions · 11 values By thickness**Cold drawn / hard** source `steelnumber` | Thickness mm | Rm N/mm² | A% | |---|---|---| | 5 – 10 | 660 – 960 | 6 | | 10 – 16 | 620 – 920 | 6 | | 16 – 40 | 600 – 900 | 7 | | 40 – 63 | 580 – 840 | 8 | | 63 – 100 | 560 – 820 | 9 | By delivery state**As rolled and turned** source `steelnumber` | Delivery state | HB | |---|---| | As rolled and turned | 163 – 222 | 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 1.0, 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. [40S20 1.0762 Mn 1,30-1,70 · Si ≤0,40 - ΔMn 0.00 - ΔSi 0.00 - 52 designations](/materials/din-en/40s20 "40S20")[44 SMnPb 28 1.0763 Mn 1,30-1,70 · Si ≤0,40 - ΔMn 0.00 - ΔSi 0.00 - 1 designations](/materials/din-en/44-smnpb-28 "44 SMnPb 28")[36 SMnPb 14 1.0765 Mn 1,30-1,70 · Si ≤0,40 - ΔMn 0.00 - ΔSi 0.00 - 3 designations](/materials/din-en/36-smnpb-14 "36 SMnPb 14")[37 S 10 1.0713 Mn 1,35-1,65 · Si 0,10-0,35 - ΔMn 0.00 - ΔSi 0.02 - 2 designations](/materials/din-en/37-s-10 "37 S 10")[18 S 10 1.0712 Mn 1,30-1,60 · Si 0,10-0,35 - ΔMn 0.05 - ΔSi 0.02 - 5 designations](/materials/din-en/18-s-10 "18 S 10")[38 SMn 28 1.0760 Mn 1,20-1,50 · Si ≤0,40 - ΔMn 0.15 - ΔSi 0.00 - 3 designations](/materials/din-en/38-smn-28 "38 SMn 28") ## 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=cc410a08-e7fe-4cb0-9b3e-0e34daab4bbe&designation=4273d9e6-8670-46ec-a312-8c9d78822b11 "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/ks/sum41.pdf "Datasheet as PDF")