--- title: "1.3251 — High-speed steels" description: "1.3251 is the material number of the grade also listed as PMHS12-0-5-5. Category: High-speed steels. Designations recorded for this grade: 2." canonical: https://steelequivalents.com/materials/material-no/1.3251 language: en robots: index, follow og_type: website type: material-detail language_alternates: en: https://steelequivalents.com/materials/material-no/1.3251.md cs: https://steelequivalents.com/cs/materiály/číslo-materiálu/1.3251.md de: https://steelequivalents.com/de/werkstoffe/werkstoff-nr/1.3251.md es: https://steelequivalents.com/es/materiales/número-de-material/1.3251.md fr: https://steelequivalents.com/fr/matériaux/numéro-de-matériau/1.3251.md hu: https://steelequivalents.com/hu/anyagok/anyagszám/1.3251.md it: https://steelequivalents.com/it/materiali/numero-materiale/1.3251.md nl: https://steelequivalents.com/nl/materialen/materiaalnummer/1.3251.md pl: https://steelequivalents.com/pl/materiały/numer-materiału/1.3251.md pt: https://steelequivalents.com/pt/materiais/número-do-material/1.3251.md ru: https://steelequivalents.com/ru/материалы/номер-материала/1.3251.md tr: https://steelequivalents.com/tr/malzemeler/malzeme-numarası/1.3251.md zh: https://steelequivalents.com/zh/材料/材料编号/1.3251.md ja: https://steelequivalents.com/ja/材料/材料番号/1.3251.md ar: https://steelequivalents.com/ar/المواد/رقم-المادة/1.3251.md ko: https://steelequivalents.com/ko/재료/재료번호/1.3251.md pt-br: https://steelequivalents.com/pt-br/materiais/número-do-material/1.3251.md hi: https://steelequivalents.com/hi/सामग्री/सामग्री-संख्या/1.3251.md content_hash: sha256:4ec18aad6dfbb6a3cbe42015347d492b5828756ccb246284682f88873312443c 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/material-no/1.3251 > Canonical URL: https://steelequivalents.com/materials/material-no/1.3251 > 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. Material number · Europe · 2 designations # 1.3251 1.3251 is the material number of the grade also listed as PMHS12-0-5-5. It is a material in the category High-speed steels. We list 2 designations recorded for this grade, in the standards DIN / EN. - ***Material no.* **1.3251**** - [*Category* **High-speed steels · 59 grades**](/categories/high-speed-steels "Category: High-speed steels · 59 grades") - *Designations* **2** [Search](/search "Steel grade search")[Inquiry](/inquiry?material=18105bb7-75d2-48b2-aa70-300f8966cc44 "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/material-no/1.3251.pdf "Datasheet as PDF") ## If you came for one of these The most-used names for this grade. - [DIN / EN PMHS12-0-5-5 This grade’s own name](/materials/din-en/pmhs12-0-5-5 "DIN / EN PMHS12-0-5-5") ## About High-speed steels High-speed steels are alloyed tool steels designed to retain hardness and cutting ability when tools heat up during high-speed machining. Their hot hardness and wear resistance make them suitable for cutting tools such as drills, milling cutters, taps and broaches. This describes the material class as a whole. Always confirm the individual grade against the standard before ordering. ## Also known as 2 designations · 1 standards · nothing hidden This grade’s own name recorded in our sources as this grade’s own designation under that standard. Indicative taken from a published cross-reference table; a close match, not a guarantee of interchangeability. Verify against the mill certificate before ordering. Withdrawn designation no longer current — a separate column from the two above, so a name can be same grade and withdrawn at once. DIN / EN Europe · 2 - [ASP2015 This grade’s own name Withdrawn](/materials/din-en/asp2015 "DIN / EN ASP2015") - [PMHS12-0-5-5 This grade’s own name](/materials/din-en/pmhs12-0-5-5 "DIN / EN PMHS12-0-5-5") Every designation on file is listed — no truncation, no “+ n more”. Each one is itself a route that leads back here. ## Chemical composition 9 elements on file · weight % What this alloy is Fe W Co V Iron — the balance, never listed by a standard — 71.4 % W — 12.4 % Co — 5 % V — 4.9 % Traces & impurities · 6.4 % Logarithmic scale, 0.01 % to 100 % — every value here compares directly, decade by decade. | Element | % by weight | |---|---| | C | 1.5–1.6 | | Si | 0.1–0.6 | | Mn | 0.1–0.4 | | P | 0.03 | | S | 0.07 | | Cr | 3.7–4.5 | | V | 4.5–5.3 | | W | 11.7–13 | | Co | 4.7–5.3 | Carbon Silicon Manganese Phosphorus Sulfur Chromium Vanadium Tungsten Cobalt 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 | 1,50-1,60 | 1.500 | 1.600 | Range | | Si | 0,10-0,60 | 0.100 | 0.600 | Range | | P | 0,03 | 0.030 | 0.030 | Exact | | S | 0,07 | 0.070 | 0.070 | Exact | | V | 4,50-5,30 | 4.500 | 5.300 | Range | | Cr | 3,70-4,50 | 3.700 | 4.500 | Range | | Mn | 0,10-0,40 | 0.100 | 0.400 | Range | | Co | 4,70-5,30 | 4.700 | 5.300 | Range | | W | 11,7-13,0 | 11.700 | 13.000 | 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 Not enough recorded composition to predict a transformation temperature for this grade — missing: Ni, Mo. ## Physical & mechanical properties Density 7,85 g/cm³ Exact 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. ## Similar grades — and why Selection rule, stated so you can disagree with it: same number class 1.3, a shared category, and a published range for W / Co that overlaps this grade’s. These are neighbours in composition space — they are not equivalents, and none is claimed to be interchangeable with this grade. [HS12-1-4-5 1.3202 W 11,5-12,5 · Co 4,50-5,00 - ΔW 0.35 - ΔCo 0.25 - 16 designations](/materials/din-en/hs12-1-4-5 "HS12-1-4-5") ## 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=18105bb7-75d2-48b2-aa70-300f8966cc44 "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/material-no/1.3251.pdf "Datasheet as PDF")