--- title: "SCM418RCH — Cold extrusion steels" description: "SCM418RCH: 1 equivalent designations across 1 standards, with the recorded chemical composition shown next to the source text." canonical: https://steelequivalents.com/materials/jis/scm418rch language: en robots: index, follow og_type: website type: material-detail language_alternates: en: https://steelequivalents.com/materials/jis/scm418rch.md cs: https://steelequivalents.com/cs/materiály/jis/scm418rch.md de: https://steelequivalents.com/de/werkstoffe/jis/scm418rch.md es: https://steelequivalents.com/es/materiales/jis/scm418rch.md fr: https://steelequivalents.com/fr/matériaux/jis/scm418rch.md hu: https://steelequivalents.com/hu/anyagok/jis/scm418rch.md it: https://steelequivalents.com/it/materiali/jis/scm418rch.md nl: https://steelequivalents.com/nl/materialen/jis/scm418rch.md pl: https://steelequivalents.com/pl/materiały/jis/scm418rch.md pt: https://steelequivalents.com/pt/materiais/jis/scm418rch.md ru: https://steelequivalents.com/ru/материалы/jis/scm418rch.md tr: https://steelequivalents.com/tr/malzemeler/jis/scm418rch.md zh: https://steelequivalents.com/zh/材料/jis/scm418rch.md ja: https://steelequivalents.com/ja/材料/jis/scm418rch.md ar: https://steelequivalents.com/ar/المواد/jis/scm418rch.md ko: https://steelequivalents.com/ko/재료/jis/scm418rch.md pt-br: https://steelequivalents.com/pt-br/materiais/jis/scm418rch.md hi: https://steelequivalents.com/hi/सामग्री/jis/scm418rch.md content_hash: sha256:fe387a685244f270a48990109a996ebd1acd30c47ea09913a290fafa2dbfed1e 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/jis/scm418rch > Canonical URL: https://steelequivalents.com/materials/jis/scm418rch > 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. JIS · Japan · 1 designation # SCM418RCH SCM418RCH is a material in the category [Cold extrusion steels](/categories/cold-extrusion-steels "Cold extrusion steels"). Its recorded composition includes C 0.16–0.21%, Si 0.15–0.35%, Cr 0.9–1.2%, Mn 0.6–0.9% and Cu ≤ 0.3%. No cross-standard equivalents are recorded for this grade yet. - [*Category* **Cold extrusion steels · 156 grades**](/categories/cold-extrusion-steels "Category: Cold extrusion steels · 156 grades") - *Designations* **1** [Search](/search "Steel grade search")[Inquiry](/inquiry?material=23348355-daca-4ef3-98e3-c81665522bd8&designation=370c2ab2-ba41-4754-9085-d4eb0f66492e "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/jis/scm418rch.pdf "Datasheet as PDF") ## About Cold extrusion steels Cold extrusion steels are engineering materials designed to be shaped into components by cold forming and extrusion. They combine the ductility needed for substantial plastic deformation with the strength and toughness required in cold-formed fasteners, automotive parts and other precision components. This describes the material class as a whole. Always confirm the individual grade against the standard before ordering. ## Chemical composition 9 elements on file · weight % What this alloy is Fe Cr Mn Cu Iron — the balance, never listed by a standard — 97 % Cr — 1.1 % Mn — 0.8 % Cu — 0.3 % Traces & impurities · 0.9 % Logarithmic scale, 0.01 % to 100 % — every value here compares directly, decade by decade. | Element | % by weight | |---|---| | C | 0.16–0.21 | | Si | 0.15–0.35 | | Mn | 0.6–0.9 | | P | ≤ 0.03 | | S | ≤ 0.03 | | Cr | 0.9–1.2 | | Mo | 0.15–0.25 | | Ni | ≤ 0.25 | | Cu | ≤ 0.3 | Carbon Silicon Manganese Phosphorus Sulfur Chromium Molybdenum Nickel Copper 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 | 0.16 - 0.21 | 0.160 | 0.210 | Range | | Si | 0.15 - 0.35 | 0.150 | 0.350 | Range | | P | max 0.03 | — | 0.030 | Max | | S | max 0.03 | — | 0.030 | Max | | Cr | 0.9 - 1.2 | 0.900 | 1.200 | Range | | Mn | 0.6 - 0.9 | 0.600 | 0.900 | Range | | Ni | max 0.25 | — | 0.250 | Max | | Cu | max 0.3 | — | 0.300 | Max | | Mo | 0.15 - 0.25 | 0.150 | 0.250 | 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 computed from composition · °C Predicted Ae3 813 °C Predicted Ae1 742 °C Predicted Acm 475 °C Predicted Bs 539 °C These four temperatures are a CALCULATION from this grade's own composition, using the published Li, Niebuhr, Meekisho & Atteridge (1998) model — never a measurement, and computed from the UPPER BOUND of each element's specified range, not a mid-range figure. Where this grade also has a measured transformation point (Ac1, Ac3, Ar1, Ar3) on file, it is shown separately, in Physical & mechanical properties, and is never replaced by the predicted figures here — Ae (predicted, equilibrium) and Ac/Ar (measured, on heating or cooling) are different physical quantities and can differ by tens of degrees; a mismatch between the two is not an error in either. ## Physical & mechanical properties 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=23348355-daca-4ef3-98e3-c81665522bd8&designation=370c2ab2-ba41-4754-9085-d4eb0f66492e "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/jis/scm418rch.pdf "Datasheet as PDF")