--- title: "ЭП430 — Heat-resistant structural steels" description: "ЭП430 in GOST: material number 1.7715, also listed as 14MoV6-3. Category: Heat-resistant structural steels. Designations recorded for this grade: 30." canonical: https://steelequivalents.com/materials/gost/ep430 language: en robots: index, follow og_type: website type: material-detail language_alternates: en: https://steelequivalents.com/materials/gost/ep430.md cs: https://steelequivalents.com/cs/materiály/gost/ep430.md de: https://steelequivalents.com/de/werkstoffe/gost/ep430.md es: https://steelequivalents.com/es/materiales/gost/ep430.md fr: https://steelequivalents.com/fr/matériaux/gost/ep430.md hu: https://steelequivalents.com/hu/anyagok/gost/ep430.md it: https://steelequivalents.com/it/materiali/gost/ep430.md nl: https://steelequivalents.com/nl/materialen/gost/ep430.md pl: https://steelequivalents.com/pl/materiały/gost/ep430.md pt: https://steelequivalents.com/pt/materiais/gost/ep430.md ru: https://steelequivalents.com/ru/материалы/gost/эп430.md tr: https://steelequivalents.com/tr/malzemeler/gost/ep430.md zh: https://steelequivalents.com/zh/材料/gost/ep430.md ja: https://steelequivalents.com/ja/材料/gost/ep430.md ar: https://steelequivalents.com/ar/المواد/gost/ep430.md ko: https://steelequivalents.com/ko/재료/gost/ep430.md pt-br: https://steelequivalents.com/pt-br/materiais/gost/ep430.md hi: https://steelequivalents.com/hi/सामग्री/gost/ep430.md content_hash: sha256:a1348fe03953123f2920ba1a5486f92d4414c5efffe5d8379e2f10b1b3089111 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/ep430 > Canonical URL: https://steelequivalents.com/materials/gost/ep430 > 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 · 30 designations # ЭП430 ЭП430 is a designation in GOST for the material held under material number 1.7715, also listed as 14MoV6-3. It is a material in the category Heat-resistant structural steels. We list 30 designations recorded for this grade, in the standards DIN / EN, UNS, ASTM, BS, UNE, GOST, ČSN, PN and MSZ. - [*Material no.* **1.7715**](/materials/material-no/1.7715 "Material no.: 1.7715") - [*Category* **Heat-resistant structural steels · 62 grades**](/categories/heat-resistant-structural-steels "Category: Heat-resistant structural steels · 62 grades") - *Designations* **30** [Search](/search "Steel grade search")[Inquiry](/inquiry?material=788f9ee8-f922-46e2-8ed0-59e6585de68f&designation=8792e267-fdee-4953-a905-10254640fe71 "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/gost/ep430.pdf "Datasheet as PDF") ## If you came for one of these The most-used names for this grade. - [DIN / EN 14MoV6-3 This grade’s own name](/materials/din-en/14mov6-3 "DIN / EN 14MoV6-3") - [UNS K11591 This grade’s own name](/materials/uns/k11591 "UNS K11591") ## About Heat-resistant structural steels Heat-resistant structural steels are structural steels designed to retain useful strength and dimensional stability at elevated temperatures. They are used for load-bearing components in hot-service equipment where mechanical performance must be maintained during heating. This describes the material class as a whole. Always confirm the individual grade against the standard before ordering. ## Also known as 30 designations · 9 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 - [1.7715 Indicative](/materials/material-no/1.7715 "DIN / EN 1.7715") - [14MoV6-3 This grade’s own name](/materials/din-en/14mov6-3 "DIN / EN 14MoV6-3") UNS United States · 2 - [A 405 P24 Indicative](/materials/astm/a-405-p24 "UNS A 405 P24") - [K11591 This grade’s own name](/materials/uns/k11591 "UNS K11591") ASTM United States · 2 - [A 405 P24 Indicative](/materials/astm/a-405-p24 "ASTM A 405 P24") - [K11591 Indicative](/materials/uns/k11591 "ASTM K11591") BS United Kingdom · 4 - [1503-660-440 Indicative](/materials/bs/1503-660-440 "BS 1503-660-440") - [440 Indicative](/materials/bs/440 "BS 440") - [660 Indicative](/materials/aisi-sae/660 "BS 660") - [660-460 Indicative](/materials/bs/660-460 "BS 660-460") UNE Spain · 2 - [13MoCrV6 Indicative](/materials/une/13mocrv6 "UNE 13MoCrV6") - [F.2621 Indicative](/materials/une/f-2621 "UNE F.2621") GOST Russia / CIS · 13 - [120Х Indicative](/materials/gost/120kh "GOST 120Х") - [12Ch1MF Indicative](/materials/gost/12ch1mf "GOST 12Ch1MF") - [12DKHN1MFL Indicative](/materials/gost/12dkhn1mfl "GOST 12DKHN1MFL") - [12GS-1 Indicative](/materials/gost/12gs-1 "GOST 12GS-1") - [12GSBYu-1 Indicative](/materials/gost/12gsbyu-1 "GOST 12GSBYu-1") - [12KH1 Indicative](/materials/gost/12kh1 "GOST 12KH1") - [12Kh1MF Indicative](/materials/gost/12kh1mf "GOST 12Kh1MF") - [12Kh1MF-PV Indicative](/materials/gost/12kh1mf-pv "GOST 12Kh1MF-PV") - [12Х1МФ Indicative](/materials/gost/12kh1mf "GOST 12Х1МФ") - [12ХМФ Indicative](/materials/gost/12khmf "GOST 12ХМФ") - [1KH2M1 Indicative](/materials/gost/1kh2m1 "GOST 1KH2M1") - [ст.12Х1МФ Indicative](/materials/gost/st-12kh1mf "GOST ст.12Х1МФ") - **ЭП430 Indicative** ČSN Czechia · 1 - [15128 Indicative](/materials/csn/15128 "ČSN 15128") PN Poland · 3 - [12HMF Indicative](/materials/pn/12hmf "PN 12HMF") - [13HMF Indicative](/materials/pn/13hmf "PN 13HMF") - [15HMF Indicative](/materials/pn/15hmf "PN 15HMF") MSZ Hungary · 1 - [KL 10 Indicative](/materials/msz/kl-10 "MSZ KL 10") 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 Mo Mn Cr Iron — the balance, never listed by a standard — 97.5 % Mo — 0.6 % Mn — 0.6 % Cr — 0.4 % Traces & impurities · 0.9 % Logarithmic scale, 0.01 % to 100 % — every value here compares directly, decade by decade. | Element | % by weight | |---|---| | C | 0.1–0.18 | | Si | ≤ 0.4 | | Mn | 0.4–0.7 | | P | 0.025 | | S | 0.015 | | Cr | 0.3–0.6 | | Mo | 0.5–0.7 | | V | 0.22–0.28 | | Al | ≤ 0.02 | | Sn | ≤ 0.025 | Carbon Silicon Manganese Phosphorus Sulfur Chromium Molybdenum Vanadium Aluminium Tin 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 | 0,10-0,18 | 0.100 | 0.180 | Range | | Al | ≤0,020 | — | 0.020 | Max | | Si | ≤0,40 | — | 0.400 | Max | | P | 0,025 | 0.025 | 0.025 | Exact | | S | 0,015 | 0.015 | 0.015 | Exact | | V | 0,22-0,28 | 0.220 | 0.280 | Range | | Cr | 0,30-0,60 | 0.300 | 0.600 | Range | | Mn | 0,40-0,70 | 0.400 | 0.700 | Range | | Mo | 0,50-0,70 | 0.500 | 0.700 | Range | | Sn | ≤0,025 | — | 0.025 | 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 Not enough recorded composition to predict a transformation temperature for this grade — missing: Ni. ## Physical & mechanical properties Density 7,85 g/cm³ Exact Transformation point Ac1 760 °C Exact Transformation point Ac3 890 °C Exact · Ac3(Acm) Transformation point Ar3 825 °C Exact · Ar3(Arcm) Transformation point Ar1 730 °C Exact Weldability weldable with restrictions As published: limited weldability. 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 4 conditions · 62 values By delivery state**no delivery state stated** source `splav` | Delivery state | Rm N/mm² | Re N/mm² | A5% | KCU kJ/m² | HB | |---|---|---|---|---|---| | Sheet, GOST 5520-79 | 440 – 640 | 295 | 21 | 790 | — | | 12Kh1MF ( 12Х1МФ ) (normalize) | — | — | — | — | 123 – 179 | | 12Kh1MF ( 12Х1МФ ) (hot-rolled, annealing) , GOST 20072-74 | — | — | — | — | 217 | By heat-treated condition**no delivery state stated** source `splav` | Heat-treated condition | Rm N/mm² | Re N/mm² | A5% | Z% | KCU kJ/m² | |---|---|---|---|---|---| | Bar, GOST 20072-74 | 470 | 255 | 21 | 55 | 980 | By heat-treated condition**no delivery state stated** source `splav` | Heat-treated condition | Rm N/mm² | Re N/mm² | A5% | Z% | KCU kJ/m² | |---|---|---|---|---|---| | Forging | 480 | 260 | 20 | 50 | 600 | At temperature**no delivery state stated** source `splav` | Temperature °C | Density g/cm³ | Elastic modulus GPa | Thermal expansion coefficient 10^-6/K | Thermal conductivity W/(m·K) | Electrical resistivity nΩ·m | |---|---|---|---|---|---| | 20 | 7.8 | 198 | — | — | 230 | | 100 | 7.78 | 193 | 12.4 | 44 | 278 | | 200 | 7.75 | 188 | 13 | 44 | 343 | | 300 | 7.72 | 183 | 13.6 | 42 | 430 | | 400 | 7.68 | 175 | 14 | 40 | 532 | | 500 | 7.64 | 167 | 14.4 | 37 | 647 | | 600 | 7.6 | 157 | 14.7 | 35 | 775 | | 700 | 7.57 | 151 | 14.9 | 32 | 962 | | 800 | 7.54 | — | 14.8 | 28 | 1087 | | 900 | 7.56 | — | 12 | 28 | 1130 | 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. ## Similar grades — and why Selection rule, stated so you can disagree with it: same number class 1.7, a shared category, and a published range for Mo / Mn 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. [13CrMoSi5-5 1.7336 Mo 0,45-0,65 · Mn 0,40-0,65 - ΔMo 0.05 - ΔMn 0.03 - 12 designations](/materials/din-en/13crmosi5-5 "13CrMoSi5-5")[40CrMoV4-6 1.7711 Mo 0,50-0,65 · Mn 0,45-0,85 - ΔMo 0.03 - ΔMn 0.10 - 8 designations](/materials/din-en/40crmov4-6 "40CrMoV4-6")[21CrMoV5-7 1.7709 Mo 0,55-0,80 · Mn 0,40-0,80 - ΔMo 0.08 - ΔMn 0.05 - 14 designations](/materials/din-en/21crmov5-7 "21CrMoV5-7")[10CrMo5-5 1.7338 Mo 0,45-0,65 · Mn 0,30-0,60 - ΔMo 0.05 - ΔMn 0.10 - 3 designations](/materials/din-en/10crmo5-5 "10CrMo5-5")[24CrMoV5-5 1.7733 Mo 0,50-0,60 · Mn 0,30-0,60 - ΔMo 0.05 - ΔMn 0.10 - 31 designations](/materials/din-en/24crmov5-5 "24CrMoV5-5")[17CrMo3-5 1.7332 Mo 0,45-0,60 · Mn 0,55-0,80 - ΔMo 0.07 - ΔMn 0.13 - 4 designations](/materials/din-en/17crmo3-5 "17CrMo3-5") ## 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=788f9ee8-f922-46e2-8ed0-59e6585de68f&designation=8792e267-fdee-4953-a905-10254640fe71 "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/gost/ep430.pdf "Datasheet as PDF")