--- title: "ЭИ959 — Tool steels for hot work" description: "ЭИ959 in GOST: material number 1.2567, also listed as 30WCrV17-2. Category: Tool steels for hot work. Designations recorded for this grade: 21." canonical: https://steelequivalents.com/materials/gost/ei959 language: en robots: index, follow og_type: website type: material-detail language_alternates: en: https://steelequivalents.com/materials/gost/ei959.md cs: https://steelequivalents.com/cs/materiály/gost/ei959.md de: https://steelequivalents.com/de/werkstoffe/gost/ei959.md es: https://steelequivalents.com/es/materiales/gost/ei959.md fr: https://steelequivalents.com/fr/matériaux/gost/ei959.md hu: https://steelequivalents.com/hu/anyagok/gost/ei959.md it: https://steelequivalents.com/it/materiali/gost/ei959.md nl: https://steelequivalents.com/nl/materialen/gost/ei959.md pl: https://steelequivalents.com/pl/materiały/gost/ei959.md pt: https://steelequivalents.com/pt/materiais/gost/ei959.md ru: https://steelequivalents.com/ru/материалы/gost/эи959.md tr: https://steelequivalents.com/tr/malzemeler/gost/ei959.md zh: https://steelequivalents.com/zh/材料/gost/ei959.md ja: https://steelequivalents.com/ja/材料/gost/ei959.md ar: https://steelequivalents.com/ar/المواد/gost/ei959.md ko: https://steelequivalents.com/ko/재료/gost/ei959.md pt-br: https://steelequivalents.com/pt-br/materiais/gost/ei959.md hi: https://steelequivalents.com/hi/सामग्री/gost/ei959.md content_hash: sha256:6930c87178b5f2f75d39ea445be0d8354b2ab5a25d0b359411b711825f55448d 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/ei959 > Canonical URL: https://steelequivalents.com/materials/gost/ei959 > 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 · 21 designations # ЭИ959 ЭИ959 is a designation in GOST for the material held under material number 1.2567, also listed as 30WCrV17-2. It is a material in the category Tool steels for hot work. We list 21 designations recorded for this grade, in the standards DIN / EN, AISI / SAE, AFNOR, ISO, JIS, GOST, UNI, ČSN, PN and ÖNORM. - [*Material no.* **1.2567**](/materials/material-no/1.2567 "Material no.: 1.2567") - [*Category* **Tool steels for hot work · 37 grades**](/categories/tool-steels-for-hot-work "Category: Tool steels for hot work · 37 grades") - *Designations* **21** [Search](/search "Steel grade search")[Inquiry](/inquiry?material=fc4c7c29-2ebc-4109-9c9b-8af8dd18c1fe&designation=5958b54e-8d4b-4006-a10b-3f26a3a22081 "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/gost/ei959.pdf "Datasheet as PDF") ## If you came for one of these The most-used names for this grade. - [DIN / EN 30WCrV17-2 This grade’s own name](/materials/din-en/30wcrv17-2 "DIN / EN 30WCrV17-2") ## About Tool steels for hot work Tool steels for hot work are alloy steels designed for tooling that operates in contact with heated metal. They are characterised by hot hardness, wear resistance, toughness and resistance to thermal fatigue, making them suitable for dies, moulds, punches and other forging, extrusion and die-casting tools. This describes the material class as a whole. Always confirm the individual grade against the standard before ordering. ## Also known as 21 designations · 10 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 · 1 - [30WCrV17-2 This grade’s own name](/materials/din-en/30wcrv17-2 "DIN / EN 30WCrV17-2") AISI / SAE United States · 2 - [H12 Indicative](/materials/aisi-sae/h12 "AISI / SAE H12") - [T20812 Indicative](/materials/uns/t20812 "AISI / SAE T20812") AFNOR France · 2 - [X32WCrV5 Indicative](/materials/afnor/x32wcrv5 "AFNOR X32WCrV5") - [Z32WCV5 Indicative](/materials/afnor/z32wcv5 "AFNOR Z32WCV5") ISO International · 2 - [30WCrV5 Indicative](/materials/iso/30wcrv5 "ISO 30WCrV5") - [X30WCrV5-3 Indicative](/materials/din-en/x30wcrv5-3 "ISO X30WCrV5-3") JIS Japan · 2 - [SKD4 Indicative](/materials/jis/skd4 "JIS SKD4") - [SKD62 Indicative](/materials/jis/skd62 "JIS SKD62") GOST Russia / CIS · 7 - [4Ch2W5MF Indicative](/materials/gost/4ch2w5mf "GOST 4Ch2W5MF") - [4KH2V5MF Indicative](/materials/gost/4kh2v5mf "GOST 4KH2V5MF") - [4KH4VMFS Indicative](/materials/gost/4kh4vmfs "GOST 4KH4VMFS") - [4Х2В5МФ Indicative](/materials/gost/4kh2v5mf "GOST 4Х2В5МФ") - [4Х4ВМФС Indicative](/materials/gost/4kh4vmfs "GOST 4Х4ВМФС") - [ДИ22 Indicative](/materials/gost/di22 "GOST ДИ22") - **ЭИ959 Indicative** UNI Italy · 1 - [X30WCrV5-3KU Indicative](/materials/uni/x30wcrv5-3ku "UNI X30WCrV5-3KU") ČSN Czechia · 1 - [19 720 Indicative](/materials/csn/19720 "ČSN 19 720") PN Poland · 2 - [WWS Indicative](/materials/pn/wws "PN WWS") - [WWS1 Indicative](/materials/pn/wws1 "PN WWS1") ÖNORM Austria · 1 - [BOHLERW105 Indicative](/materials/onorm/bohlerw105 "ÖNORM BOHLERW105") Every designation on file is listed — no truncation, no “+ n more”. Each one is itself a route that leads back here. ## Chemical composition 8 elements on file · weight % What this alloy is Fe W Cr V Iron — the balance, never listed by a standard — 91.9 % W — 4.3 % Cr — 2.4 % V — 0.6 % Traces & impurities · 0.9 % Logarithmic scale, 0.01 % to 100 % — every value here compares directly, decade by decade. | Element | % by weight | |---|---| | C | 0.25–0.35 | | Si | 0.15–0.3 | | Mn | 0.2–0.4 | | P | 0.035 | | S | 0.035 | | Cr | 2.2–2.5 | | V | 0.5–0.7 | | W | 4–4.5 | Carbon Silicon Manganese Phosphorus Sulfur Chromium Vanadium Tungsten 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 | 0,25-0,35 | 0.250 | 0.350 | Range | | Si | 0,15-0,30 | 0.150 | 0.300 | Range | | P | 0,035 | 0.035 | 0.035 | Exact | | S | 0,035 | 0.035 | 0.035 | Exact | | V | 0,50-0,70 | 0.500 | 0.700 | Range | | Cr | 2,20-2,50 | 2.200 | 2.500 | Range | | Mn | 0,20-0,40 | 0.200 | 0.400 | Range | | W | 4,00-4,50 | 4.000 | 4.500 | 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, Mo. ## Physical & mechanical properties Density 7,85 g/cm³ Exact Transformation point Ac1 830 °C Exact Transformation point Ac3 910 °C Exact · Ac3(Acm) Transformation point Ar3 750 °C Exact · Ar3(Arcm) Transformation point Ar1 670 °C 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 2 conditions · 4 values By heat-treated condition**no delivery state stated** source `splav` | Heat-treated condition | Rm N/mm² | Re N/mm² | KCU kJ/m² | |---|---|---|---| | Bars | 1700 | 1500 | 440 | By delivery state**no delivery state stated** source `splav` | Delivery state | HB | |---|---| | 4KH4VMFS ( 4Х4ВМФС ) (heat treatment) , GOST 5950-2000 | 241 | 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. ## 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=fc4c7c29-2ebc-4109-9c9b-8af8dd18c1fe&designation=5958b54e-8d4b-4006-a10b-3f26a3a22081 "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/gost/ei959.pdf "Datasheet as PDF")