--- title: "HP235 — composition, equivalents and standards" description: "HP235: 1 equivalent designations across 1 standards, with the recorded chemical composition shown next to the source text." canonical: https://steelequivalents.com/materials/gb/hp235 language: en robots: index, follow og_type: website type: material-detail language_alternates: en: https://steelequivalents.com/materials/gb/hp235.md cs: https://steelequivalents.com/cs/materiály/gb/hp235.md de: https://steelequivalents.com/de/werkstoffe/gb/hp235.md es: https://steelequivalents.com/es/materiales/gb/hp235.md fr: https://steelequivalents.com/fr/matériaux/gb/hp235.md hu: https://steelequivalents.com/hu/anyagok/gb/hp235.md it: https://steelequivalents.com/it/materiali/gb/hp235.md nl: https://steelequivalents.com/nl/materialen/gb/hp235.md pl: https://steelequivalents.com/pl/materiały/gb/hp235.md pt: https://steelequivalents.com/pt/materiais/gb/hp235.md ru: https://steelequivalents.com/ru/материалы/gb/hp235.md tr: https://steelequivalents.com/tr/malzemeler/gb/hp235.md zh: https://steelequivalents.com/zh/材料/gb/hp235.md ja: https://steelequivalents.com/ja/材料/gb/hp235.md ar: https://steelequivalents.com/ar/المواد/gb/hp235.md ko: https://steelequivalents.com/ko/재료/gb/hp235.md pt-br: https://steelequivalents.com/pt-br/materiais/gb/hp235.md hi: https://steelequivalents.com/hi/सामग्री/gb/hp235.md content_hash: sha256:ffb848ae54d356287ab77c6dc2966499a4a9929ffba4ea828a251717ef17f6c7 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/hp235 > Canonical URL: https://steelequivalents.com/materials/gb/hp235 > 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 # HP235 HP235 is a grade designated under GB. Its recorded composition includes C ≤ 0.16%, Cr ≤ 0.3%, Mn ≤ 0.8%, Ni ≤ 0.3% and Mo ≤ 0.3%. No cross-standard equivalents are recorded for this grade yet. Recorded mechanical properties include Rm 380–500 N/mm² and A ≥ 23%. - *Designations* **1** [Search](/search "Steel grade search")[Inquiry](/inquiry?material=92692d74-293f-4869-a683-8f1b70962b52&designation=a2f53cd2-22f5-4267-8376-e3093036df58 "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/gb/hp235.pdf "Datasheet as PDF") ## Chemical composition 13 elements on file · weight % What this alloy is Fe Mn Cr Mo Iron — the balance, never listed by a standard — 97.6 % Mn — 0.8 % Cr — 0.3 % Mo — 0.3 % Traces & impurities · 1 % Logarithmic scale, 0.01 % to 100 % — every value here compares directly, decade by decade. | Element | % by weight | |---|---| | C | ≤ 0.16 | | Si | ≤ 0.1 | | Mn | ≤ 0.8 | | P | ≤ 0.025 | | S | ≤ 0.012 | | Cr | ≤ 0.3 | | Mo | ≤ 0.3 | | Ni | ≤ 0.3 | | V | ≤ 0.1 | | Cu | ≤ 0.2 | | Al | ≥ 0.015 | | Ti | ≤ 0.06 | | Nb | ≤ 0.05 | Carbon Silicon Manganese Phosphorus Sulfur Chromium Molybdenum Nickel Vanadium Copper Aluminium Titanium Niobium 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 | | Al | ≥0.015 | 0.015 | — | Min | | Si | ≤0.1 | — | 0.100 | Max | | P | ≤0.025 | — | 0.025 | Max | | S | ≤0.012 | — | 0.012 | Max | | Ti | ≤0.06 | — | 0.060 | Max | | V | ≤0.1 | — | 0.100 | Max | | Cr | ≤0.3 | — | 0.300 | Max | | Mn | ≤0.8 | — | 0.800 | Max | | Ni | ≤0.3 | — | 0.300 | Max | | Cu | ≤0.2 | — | 0.200 | Max | | Nb | ≤0.05 | — | 0.050 | Max | | Mo | ≤0.3 | — | 0.300 | 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 813 °C Predicted Ae1 717 °C Predicted Acm 394 °C Predicted Bs 573 °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 Rm 380~500 N/mm² Range A ≥23(t＜3)；≥29(t≥3)% Min 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=92692d74-293f-4869-a683-8f1b70962b52&designation=a2f53cd2-22f5-4267-8376-e3093036df58 "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/gb/hp235.pdf "Datasheet as PDF")