--- title: "12Cr2Mo1R — composition, equivalents and standards" description: "12Cr2Mo1R: 1 equivalent designations across 1 standards, with the recorded chemical composition shown next to the source text." canonical: https://steelequivalents.com/materials/gb/12cr2mo1r language: en robots: index, follow og_type: website type: material-detail language_alternates: en: https://steelequivalents.com/materials/gb/12cr2mo1r.md cs: https://steelequivalents.com/cs/materiály/gb/12cr2mo1r.md de: https://steelequivalents.com/de/werkstoffe/gb/12cr2mo1r.md es: https://steelequivalents.com/es/materiales/gb/12cr2mo1r.md fr: https://steelequivalents.com/fr/matériaux/gb/12cr2mo1r.md hu: https://steelequivalents.com/hu/anyagok/gb/12cr2mo1r.md it: https://steelequivalents.com/it/materiali/gb/12cr2mo1r.md nl: https://steelequivalents.com/nl/materialen/gb/12cr2mo1r.md pl: https://steelequivalents.com/pl/materiały/gb/12cr2mo1r.md pt: https://steelequivalents.com/pt/materiais/gb/12cr2mo1r.md ru: https://steelequivalents.com/ru/материалы/gb/12cr2mo1r.md tr: https://steelequivalents.com/tr/malzemeler/gb/12cr2mo1r.md zh: https://steelequivalents.com/zh/材料/gb/12cr2mo1r.md ja: https://steelequivalents.com/ja/材料/gb/12cr2mo1r.md ar: https://steelequivalents.com/ar/المواد/gb/12cr2mo1r.md ko: https://steelequivalents.com/ko/재료/gb/12cr2mo1r.md pt-br: https://steelequivalents.com/pt-br/materiais/gb/12cr2mo1r.md hi: https://steelequivalents.com/hi/सामग्री/gb/12cr2mo1r.md content_hash: sha256:16b6c1ec74dcd7eadc3b7a52d3e417e6b47b71cf3bcfce1f3759bd8c21889ce1 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/12cr2mo1r > Canonical URL: https://steelequivalents.com/materials/gb/12cr2mo1r > 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 · 1 designation # 12Cr2Mo1R 12Cr2Mo1R is a grade designated under GB. Its recorded composition includes C 0.08–0.15%, Si ≤ 0.5%, Cr 2–2.5%, Mn 0.3–0.6% and Mo 0.9–1.1%. No cross-standard equivalents are recorded for this grade yet. Recorded mechanical properties include Rm 520–680 N/mm², Re ≥ 310 N/mm² and A ≥ 19%. - *Designations* **1** [Search](/search "Steel grade search")[Inquiry](/inquiry?material=ddc83488-70cd-4759-b1e1-c30d0d21f166&designation=69cb62ce-b6c6-4796-8e5d-c8f3f37938ea "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/gb/12cr2mo1r.pdf "Datasheet as PDF") ## Chemical composition 9 elements on file · weight % What this alloy is Fe Cr Mo Si Iron — the balance, never listed by a standard — 95.2 % Cr — 2.3 % Mo — 1 % Si — 0.5 % Traces & impurities · 1.1 % Logarithmic scale, 0.01 % to 100 % — every value here compares directly, decade by decade. | Element | % by weight | |---|---| | C | 0.08–0.15 | | Si | ≤ 0.5 | | Mn | 0.3–0.6 | | P | ≤ 0.02 | | S | ≤ 0.01 | | Cr | 2–2.5 | | Mo | 0.9–1.1 | | Ni | ≤ 0.3 | | Cu | ≤ 0.2 | 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 | 0.08-0.15 | 0.080 | 0.150 | Range | | Si | ≤0.5 | — | 0.500 | Max | | P | ≤0.02 | — | 0.020 | Max | | S | ≤0.01 | — | 0.010 | Max | | Cr | 2-2.5 | 2.000 | 2.500 | Range | | Mn | 0.3-0.6 | 0.300 | 0.600 | Range | | Ni | ≤0.3 | — | 0.300 | Max | | Cu | ≤0.2 | — | 0.200 | Max | | Mo | 0.9-1.1 | 0.900 | 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 computed from composition · °C Predicted Ae3 832 °C Predicted Ae1 780 °C Predicted Acm 450 °C Predicted Bs 473 °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. ## Properties by condition 1 conditions · 3 values By dimension**no delivery state stated** source `caishuku` | Thickness mm | Rm N/mm² | Re N/mm² | A% | |---|---|---|---| | 6 – 200 | 520 – 680 | ≥ 310 | ≥ 19 | 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. ## Heat treatment Supply condition - Normalizing and Tempering 6≤t≤200 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/azhlNWIxMjYwNjQ_ "Source: www.caishuku.com") ## 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=ddc83488-70cd-4759-b1e1-c30d0d21f166&designation=69cb62ce-b6c6-4796-8e5d-c8f3f37938ea "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/gb/12cr2mo1r.pdf "Datasheet as PDF")