--- title: "ML18Mn — composition, equivalents and standards" description: "ML18Mn is a designation in GB for the grade also listed as C17C. Designations recorded for this grade: 5." canonical: https://steelequivalents.com/materials/gb/ml18mn language: en robots: index, follow og_type: website type: material-detail language_alternates: en: https://steelequivalents.com/materials/gb/ml18mn.md cs: https://steelequivalents.com/cs/materiály/gb/ml18mn.md de: https://steelequivalents.com/de/werkstoffe/gb/ml18mn.md es: https://steelequivalents.com/es/materiales/gb/ml18mn.md fr: https://steelequivalents.com/fr/matériaux/gb/ml18mn.md hu: https://steelequivalents.com/hu/anyagok/gb/ml18mn.md it: https://steelequivalents.com/it/materiali/gb/ml18mn.md nl: https://steelequivalents.com/nl/materialen/gb/ml18mn.md pl: https://steelequivalents.com/pl/materiały/gb/ml18mn.md pt: https://steelequivalents.com/pt/materiais/gb/ml18mn.md ru: https://steelequivalents.com/ru/материалы/gb/ml18mn.md tr: https://steelequivalents.com/tr/malzemeler/gb/ml18mn.md zh: https://steelequivalents.com/zh/材料/gb/ml18mn.md ja: https://steelequivalents.com/ja/材料/gb/ml18mn.md ar: https://steelequivalents.com/ar/المواد/gb/ml18mn.md ko: https://steelequivalents.com/ko/재료/gb/ml18mn.md pt-br: https://steelequivalents.com/pt-br/materiais/gb/ml18mn.md hi: https://steelequivalents.com/hi/सामग्री/gb/ml18mn.md content_hash: sha256:6ea1743a0647e9da514800356cbc0e3741480483c493bbb4ab2cecb52d4e3054 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/gb/ml18mn > Canonical URL: https://steelequivalents.com/materials/gb/ml18mn > 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. GB · China · 5 designations # ML18Mn ML18Mn is a designation in GB for the grade also listed as C17C. We list 5 designations recorded for this grade, in the standards DIN / EN, ASTM, ISO, JIS and GB. - *Designations* **5** [Search](/search "Steel grade search")[Inquiry](/inquiry?material=e1519d3e-161b-46f9-828c-0dd163840655&designation=bfe1c2a6-0f7a-4518-ba16-855480dcd705 "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/gb/ml18mn.pdf "Datasheet as PDF") ## 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 - [C17C Indicative](/materials/din-en/c17c "DIN / EN C17C") ASTM United States · 1 - [1018 Indicative](/materials/aisi-sae/1018 "ASTM 1018") ISO International · 1 - [C17C Indicative](/materials/din-en/c17c "ISO C17C") JIS Japan · 1 - [SWRCH18A Indicative](/materials/jis/swrch18a "JIS SWRCH18A") GB China · 1 - **ML18Mn 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 6 elements on file · weight % What this alloy is Fe Mn C Si Iron — the balance, never listed by a standard — 98.9 % Mn — 0.8 % C — 0.2 % Si — 0.1 % Traces & impurities · 0.1 % Logarithmic scale, 0.01 % to 100 % — every value here compares directly, decade by decade. | Element | % by weight | |---|---| | C | 0.15–0.2 | | Si | ≤ 0.1 | | Mn | 0.6–0.9 | | P | ≤ 0.03 | | S | ≤ 0.035 | | Al | ≥ 0.02 | Carbon Silicon Manganese Phosphorus Sulfur Aluminium 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 | 0.15-0.2 | 0.150 | 0.200 | Range | | Al | ≥0.02 | 0.020 | — | Min | | Si | ≤0.1 | — | 0.100 | Max | | P | ≤0.03 | — | 0.030 | Max | | S | ≤0.035 | — | 0.035 | Max | | Mn | 0.6-0.9 | 0.600 | 0.900 | 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 Rm ≤480 N/mm² Max 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. ## 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=e1519d3e-161b-46f9-828c-0dd163840655&designation=bfe1c2a6-0f7a-4518-ba16-855480dcd705 "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/gb/ml18mn.pdf "Datasheet as PDF")