--- title: "Р12МФ5К5 — High-speed steels" description: "Р12МФ5К5 in GOST: material number 1.3202, also listed as HS12-1-4-5. Category: High-speed steels. Designations recorded for this grade: 16." canonical: https://steelequivalents.com/materials/gost/r12mf5k5 language: en robots: index, follow og_type: website type: material-detail language_alternates: en: https://steelequivalents.com/materials/gost/r12mf5k5.md cs: https://steelequivalents.com/cs/materiály/gost/r12mf5k5.md de: https://steelequivalents.com/de/werkstoffe/gost/r12mf5k5.md es: https://steelequivalents.com/es/materiales/gost/r12mf5k5.md fr: https://steelequivalents.com/fr/matériaux/gost/r12mf5k5.md hu: https://steelequivalents.com/hu/anyagok/gost/r12mf5k5.md it: https://steelequivalents.com/it/materiali/gost/r12mf5k5.md nl: https://steelequivalents.com/nl/materialen/gost/r12mf5k5.md pl: https://steelequivalents.com/pl/materiały/gost/r12mf5k5.md pt: https://steelequivalents.com/pt/materiais/gost/r12mf5k5.md ru: https://steelequivalents.com/ru/материалы/gost/р12мф5к5.md tr: https://steelequivalents.com/tr/malzemeler/gost/r12mf5k5.md zh: https://steelequivalents.com/zh/材料/gost/r12mf5k5.md ja: https://steelequivalents.com/ja/材料/gost/r12mf5k5.md ar: https://steelequivalents.com/ar/المواد/gost/r12mf5k5.md ko: https://steelequivalents.com/ko/재료/gost/r12mf5k5.md pt-br: https://steelequivalents.com/pt-br/materiais/gost/r12mf5k5.md hi: https://steelequivalents.com/hi/सामग्री/gost/r12mf5k5.md content_hash: sha256:3e1facb3afcd51ec6df14281da17b73e4d16bc3afc0c6b9ee95a3ad838c3fa12 generated: 2026-09-22 --- > **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/gost/r12mf5k5 > Canonical URL: https://steelequivalents.com/materials/gost/r12mf5k5 > 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. GOST · Russia / CIS · 16 designations # Р12МФ5К5 Р12МФ5К5 is a designation in GOST for the material held under material number 1.3202, also listed as HS12-1-4-5. It is a material in the category High-speed steels. We list 16 designations recorded for this grade, in the standards DIN / EN, UNS, AISI / SAE, BS, AFNOR, UNE, JIS, GB, GOST, ČSN, SRPS, PN and KS. - [*Material no.* **1.3202**](/materials/material-no/1.3202 "Material no.: 1.3202") - [*Category* **High-speed steels · 59 grades**](/categories/high-speed-steels "Category: High-speed steels · 59 grades") - *Designations* **16** [Search](/search "Steel grade search")[Inquiry](/inquiry?material=a9a0a899-b52c-4172-b345-506426ae6e47&designation=3c817aeb-fdfe-421e-977a-f34eef6ae6a1 "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/gost/r12mf5k5.pdf "Datasheet as PDF") ## If you came for one of these The most-used names for this grade. - [DIN / EN HS12-1-4-5 This grade’s own name](/materials/din-en/hs12-1-4-5 "DIN / EN HS12-1-4-5") - [UNS T12015 This grade’s own name](/materials/uns/t12015 "UNS T12015") - [AISI / SAE T15 This grade’s own name](/materials/aisi-sae/t15 "AISI / SAE T15") - [KS SKH10 This grade’s own name](/materials/ks/skh10 "KS SKH10") ## 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 16 designations · 13 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 - [HS12-1-4-5 This grade’s own name](/materials/din-en/hs12-1-4-5 "DIN / EN HS12-1-4-5") - [S12-1-4-5 This grade’s own name Withdrawn](/materials/din-en/s12-1-4-5 "DIN / EN S12-1-4-5") UNS United States · 1 - [T12015 This grade’s own name](/materials/uns/t12015 "UNS T12015") AISI / SAE United States · 1 - [T15 This grade’s own name](/materials/aisi-sae/t15 "AISI / SAE T15") BS United Kingdom · 1 - [BT15 Indicative](/materials/bs/bt15 "BS BT15") AFNOR France · 1 - [Z160WKVC12-05-05-04 Indicative](/materials/afnor/z160wkvc12-05-05-04 "AFNOR Z160WKVC12-05-05-04") UNE Spain · 2 - [12-1-5-5 Indicative](/materials/une/12-1-5-5 "UNE 12-1-5-5") - [F.5563 Indicative](/materials/une/f-5563 "UNE F.5563") JIS Japan · 1 - [SKH10 Indicative](/materials/ks/skh10 "JIS SKH10") GB China · 1 - [W12Cr4V5Co5 Indicative](/materials/gb/w12cr4v5co5 "GB W12Cr4V5Co5") GOST Russia / CIS · 2 - [R12MF4K5 Indicative](/materials/gost/r12mf4k5 "GOST R12MF4K5") - **Р12МФ5К5 Indicative** ČSN Czechia · 1 - [19 858 Indicative](/materials/csn/19-858 "ČSN 19 858") SRPS Serbia · 1 - [Č.9681 Indicative](/materials/srps/c-9681 "SRPS Č.9681") PN Poland · 1 - [SK5V Indicative](/materials/pn/sk5v "PN SK5V") KS South Korea · 1 - [SKH10 This grade’s own name](/materials/ks/skh10 "KS SKH10") Every designation on file is listed — no truncation, no “+ n more”. Each one is itself a route that leads back here. ## Chemical composition 10 elements on file · weight % What this alloy is Fe W Co Cr Iron — the balance, never listed by a standard — 72.2 % W — 12 % Co — 4.8 % Cr — 4.2 % Traces & impurities · 6.9 % Logarithmic scale, 0.01 % to 100 % — every value here compares directly, decade by decade. | Element | % by weight | |---|---| | C | 1.3–1.45 | | Si | ≤ 0.45 | | Mn | ≤ 0.4 | | P | 0.03 | | S | 0.03 | | Cr | 3.8–4.5 | | Mo | 0.7–1 | | V | 3.5–4 | | W | 11.5–12.5 | | Co | 4.5–5 | Carbon Silicon Manganese Phosphorus Sulfur Chromium Molybdenum 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 | 1,30-1,45 | 1.300 | 1.450 | Range | | Si | ≤0,45 | — | 0.450 | Max | | P | 0,03 | 0.030 | 0.030 | Exact | | S | 0,03 | 0.030 | 0.030 | Exact | | V | 3,50-4,00 | 3.500 | 4.000 | Range | | Cr | 3,80-4,50 | 3.800 | 4.500 | Range | | Mn | ≤0,40 | — | 0.400 | Max | | Co | 4,50-5,00 | 4.500 | 5.000 | Range | | Mo | 0,70-1,00 | 0.700 | 1.000 | Range | | W | 11,5-12,5 | 11.500 | 12.500 | 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. ## Physical & mechanical properties Density 8,4 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. ## Properties by condition 1 conditions · 1 values By delivery state**no delivery state stated** source `steeljis` | Delivery state | HB | |---|---| | Annealed | 285 | 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 **GB /T 9943-2025** In this order Test specimen 1. Preheating 800–900 °C 2. Quenching 1220–1240 °C Quenchant Oil, Salt bath or Nitrogen 3. Tempering 550 °C Supply condition - Annealing Supply condition - Annealing Supply condition - Quenching and Tempering Test specimen 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/azhlNWIxMTQ4NTE_ "Source: www.caishuku.com") ## 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. [PMHS12-0-5-5 1.3251 W 11,7-13,0 · Co 4,70-5,30 - ΔW 0.35 - ΔCo 0.25 - 2 designations](/materials/din-en/pmhs12-0-5-5 "PMHS12-0-5-5") ## 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=a9a0a899-b52c-4172-b345-506426ae6e47&designation=3c817aeb-fdfe-421e-977a-f34eef6ae6a1 "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/gost/r12mf5k5.pdf "Datasheet as PDF")