--- title: "FH40 — composition, equivalents and standards" description: "FH40: 1 equivalent designations across 1 standards, with the recorded chemical composition shown next to the source text." canonical: https://steelequivalents.com/materials/gb/fh40 language: en robots: index, follow og_type: website type: material-detail language_alternates: en: https://steelequivalents.com/materials/gb/fh40.md cs: https://steelequivalents.com/cs/materiály/gb/fh40.md de: https://steelequivalents.com/de/werkstoffe/gb/fh40.md es: https://steelequivalents.com/es/materiales/gb/fh40.md fr: https://steelequivalents.com/fr/matériaux/gb/fh40.md hu: https://steelequivalents.com/hu/anyagok/gb/fh40.md it: https://steelequivalents.com/it/materiali/gb/fh40.md nl: https://steelequivalents.com/nl/materialen/gb/fh40.md pl: https://steelequivalents.com/pl/materiały/gb/fh40.md pt: https://steelequivalents.com/pt/materiais/gb/fh40.md ru: https://steelequivalents.com/ru/материалы/gb/fh40.md tr: https://steelequivalents.com/tr/malzemeler/gb/fh40.md zh: https://steelequivalents.com/zh/材料/gb/fh40.md ja: https://steelequivalents.com/ja/材料/gb/fh40.md ar: https://steelequivalents.com/ar/المواد/gb/fh40.md ko: https://steelequivalents.com/ko/재료/gb/fh40.md pt-br: https://steelequivalents.com/pt-br/materiais/gb/fh40.md hi: https://steelequivalents.com/hi/सामग्री/gb/fh40.md content_hash: sha256:45c6e343ed0f1f11a7d3401ecfcfbbf9199157a14a849ac2af747c779f86b965 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/fh40 > Canonical URL: https://steelequivalents.com/materials/gb/fh40 > 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 # FH40 FH40 is a grade designated under GB. Its recorded composition includes C ≤ 0.16%, Si ≤ 0.5%, Mn 0.9–1.6%, Ni ≤ 0.8% and Cu ≤ 0.35%. No cross-standard equivalents are recorded for this grade yet. - *Designations* **1** [Search](/search "Steel grade search")[Inquiry](/inquiry?material=a4eddf5d-2f98-47d9-8566-bf48e3bc9fb2&designation=cb56b40e-fd26-4db5-9161-24113015df27 "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/gb/fh40.pdf "Datasheet as PDF") ## Chemical composition 14 elements on file · weight % What this alloy is Fe Mn Ni Si Iron — the balance, never listed by a standard — 96.5 % Mn — 1.3 % Ni — 0.8 % Si — 0.5 % Traces & impurities · 1 % Logarithmic scale, 0.01 % to 100 % — every value here compares directly, decade by decade. | Element | % by weight | |---|---| | C | ≤ 0.16 | | Si | ≤ 0.5 | | Mn | 0.9–1.6 | | P | ≤ 0.02 | | S | ≤ 0.02 | | Cr | ≤ 0.2 | | Mo | ≤ 0.08 | | Ni | ≤ 0.8 | | V | 0.05–0.1 | | Cu | ≤ 0.35 | | Al | ≥ 0.015 | | Ti | ≤ 0.02 | | Nb | 0.02–0.05 | | N | ≤ 0.009 | Carbon Silicon Manganese Phosphorus Sulfur Chromium Molybdenum Nickel Vanadium Copper Aluminium Titanium Niobium Nitrogen 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 | — | 0.160 | Max | | N | ≤0.009 | — | 0.009 | Max | | Al | ≥0.015 | 0.015 | — | Min | | Si | ≤0.5 | — | 0.500 | Max | | P | ≤0.02 | — | 0.020 | Max | | S | ≤0.02 | — | 0.020 | Max | | Ti | ≤0.02 | — | 0.020 | Max | | V | 0.05-0.1 | 0.050 | 0.100 | Range | | Cr | ≤0.2 | — | 0.200 | Max | | Mn | 0.9-1.6 | 0.900 | 1.600 | Range | | Ni | ≤0.8 | — | 0.800 | Max | | Cu | ≤0.35 | — | 0.350 | Max | | Nb | 0.02-0.05 | 0.020 | 0.050 | Range | | Mo | ≤0.08 | — | 0.080 | Max | 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 811 °C Predicted Ae1 705 °C Predicted Acm 397 °C Predicted Bs 550 °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=a4eddf5d-2f98-47d9-8566-bf48e3bc9fb2&designation=cb56b40e-fd26-4db5-9161-24113015df27 "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/gb/fh40.pdf "Datasheet as PDF")