--- title: "SCM425H — composition, equivalents and standards" description: "SCM425H: 1 equivalent designations across 1 standards, with the recorded chemical composition shown next to the source text." canonical: https://steelequivalents.com/materials/jis/scm425h language: en robots: index, follow og_type: website type: material-detail language_alternates: en: https://steelequivalents.com/materials/jis/scm425h.md cs: https://steelequivalents.com/cs/materiály/jis/scm425h.md de: https://steelequivalents.com/de/werkstoffe/jis/scm425h.md es: https://steelequivalents.com/es/materiales/jis/scm425h.md fr: https://steelequivalents.com/fr/matériaux/jis/scm425h.md hu: https://steelequivalents.com/hu/anyagok/jis/scm425h.md it: https://steelequivalents.com/it/materiali/jis/scm425h.md nl: https://steelequivalents.com/nl/materialen/jis/scm425h.md pl: https://steelequivalents.com/pl/materiały/jis/scm425h.md pt: https://steelequivalents.com/pt/materiais/jis/scm425h.md ru: https://steelequivalents.com/ru/материалы/jis/scm425h.md tr: https://steelequivalents.com/tr/malzemeler/jis/scm425h.md zh: https://steelequivalents.com/zh/材料/jis/scm425h.md ja: https://steelequivalents.com/ja/材料/jis/scm425h.md ar: https://steelequivalents.com/ar/المواد/jis/scm425h.md ko: https://steelequivalents.com/ko/재료/jis/scm425h.md pt-br: https://steelequivalents.com/pt-br/materiais/jis/scm425h.md hi: https://steelequivalents.com/hi/सामग्री/jis/scm425h.md content_hash: sha256:b3336bee19a8ad0f0394edb2a6eec854a12c8ae2328f30a6fa26ac6e584bfd0b 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/scm425h > Canonical URL: https://steelequivalents.com/materials/jis/scm425h > 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 # SCM425H SCM425H is a grade designated under JIS. Its recorded composition includes C 0.23–0.28%, Si 0.15–0.35%, Cr 0.85–1.25%, Mn 0.55–0.95% and Mo 0.15–0.3%. No cross-standard equivalents are recorded for this grade yet. - *Designations* **1** [Search](/search "Steel grade search")[Inquiry](/inquiry?material=29fbc8c0-67fc-49e6-9d0c-b96faa1ca1f5&designation=4e3a41bf-e2d8-4201-881a-5e668d901d39 "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/jis/scm425h.pdf "Datasheet as PDF") ## Chemical composition 9 elements on file · weight % What this alloy is Fe Cr Mn Cu Iron — the balance, never listed by a standard — 96.9 % Cr — 1.1 % Mn — 0.8 % Cu — 0.3 % Traces & impurities · 1 % Logarithmic scale, 0.01 % to 100 % — every value here compares directly, decade by decade. | Element | % by weight | |---|---| | C | 0.23–0.28 | | Si | 0.15–0.35 | | Mn | 0.55–0.95 | | P | ≤ 0.03 | | S | ≤ 0.03 | | Cr | 0.85–1.25 | | Mo | 0.15–0.3 | | 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 | 0.23 - 0.28 | 0.230 | 0.280 | 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 | 0.85 - 1.25 | 0.850 | 1.250 | Range | | Mn | 0.55 - 0.95 | 0.550 | 0.950 | Range | | Ni | max 0.25 | — | 0.250 | Max | | Cu | max 0.3 | — | 0.300 | Max | | Mo | 0.15 - 0.3 | 0.150 | 0.300 | 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 800 °C Predicted Ae1 743 °C Predicted Acm 533 °C Predicted Bs 529 °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=29fbc8c0-67fc-49e6-9d0c-b96faa1ca1f5&designation=4e3a41bf-e2d8-4201-881a-5e668d901d39 "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/jis/scm425h.pdf "Datasheet as PDF")