--- title: "AISI HNV 3 — Valve steels" description: "AISI HNV 3 in AISI / SAE: material number 1.4718, also listed as X45CrSi9-3. Category: Valve steels. Designations recorded for this grade: 42." canonical: https://steelequivalents.com/materials/aisi-sae/aisi-hnv-3 language: en robots: index, follow og_type: website type: material-detail language_alternates: en: https://steelequivalents.com/materials/aisi-sae/aisi-hnv-3.md cs: https://steelequivalents.com/cs/materiály/aisi-sae/aisi-hnv-3.md de: https://steelequivalents.com/de/werkstoffe/aisi-sae/aisi-hnv-3.md es: https://steelequivalents.com/es/materiales/aisi-sae/aisi-hnv-3.md fr: https://steelequivalents.com/fr/matériaux/aisi-sae/aisi-hnv-3.md hu: https://steelequivalents.com/hu/anyagok/aisi-sae/aisi-hnv-3.md it: https://steelequivalents.com/it/materiali/aisi-sae/aisi-hnv-3.md nl: https://steelequivalents.com/nl/materialen/aisi-sae/aisi-hnv-3.md pl: https://steelequivalents.com/pl/materiały/aisi-sae/aisi-hnv-3.md pt: https://steelequivalents.com/pt/materiais/aisi-sae/aisi-hnv-3.md ru: https://steelequivalents.com/ru/материалы/aisi-sae/aisi-hnv-3.md tr: https://steelequivalents.com/tr/malzemeler/aisi-sae/aisi-hnv-3.md zh: https://steelequivalents.com/zh/材料/aisi-sae/aisi-hnv-3.md ja: https://steelequivalents.com/ja/材料/aisi-sae/aisi-hnv-3.md ar: https://steelequivalents.com/ar/المواد/aisi-sae/aisi-hnv-3.md ko: https://steelequivalents.com/ko/재료/aisi-sae/aisi-hnv-3.md pt-br: https://steelequivalents.com/pt-br/materiais/aisi-sae/aisi-hnv-3.md hi: https://steelequivalents.com/hi/सामग्री/aisi-sae/aisi-hnv-3.md content_hash: sha256:c2e62c282cb7aa61bdd87703d4e075c99ae8ea4dd71980049f7e8779b141eca1 generated: 2026-09-25 --- > **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/aisi-sae/aisi-hnv-3 > Canonical URL: https://steelequivalents.com/materials/aisi-sae/aisi-hnv-3 > 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. AISI / SAE · United States · 42 designations # AISI HNV 3 AISI HNV 3 is a designation in AISI / SAE for the material held under material number 1.4718, also listed as X45CrSi9-3. It is a material in the category Valve steels. We list 42 designations recorded for this grade, in the standards DIN / EN, UNS, AISI / SAE, BS, AFNOR, UNE, ISO, JIS, GB, GOST, UNI, ČSN, PN, MSZ, STAS, BDS and KS. - [*Material no.* **1.4718**](/materials/material-no/1.4718 "Material no.: 1.4718") - [*Category* **Valve steels · 14 grades**](/categories/valve-steels "Category: Valve steels · 14 grades") - *Designations* **42** [Search](/search "Steel grade search")[Inquiry](/inquiry?material=3861e9a6-2973-44b5-9c8d-dcaffc59b397&designation=bc097853-439f-4e07-88d0-f40b6ccd786c "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/aisi-sae/aisi-hnv-3.pdf "Datasheet as PDF") ## If you came for one of these The most-used names for this grade. - [DIN / EN X45CrSi9-3 This grade’s own name · 2 grades on that route](/materials/din-en/x45crsi9-3 "DIN / EN X45CrSi9-3") ## About Valve steels Valve steels are alloy steels developed for valve components exposed to heat, pressure, wear, and corrosive service conditions. They are characterised by combinations of strength, hardness, toughness, and resistance to oxidation or corrosion suited to the operating environment. Typical uses include engine valves and industrial valve parts where reliable performance and dimensional stability are required. This describes the material class as a whole. Always confirm the individual grade against the standard before ordering. ## Also known as 42 designations · 17 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 · 3 - [1.4718 Indicative](/materials/material-no/1.4718 "DIN / EN 1.4718") - [4Cr9Si8 Indicative](/materials/din-en/4cr9si8 "DIN / EN 4Cr9Si8") - [X45CrSi9-3 This grade’s own name](/materials/din-en/x45crsi9-3 "DIN / EN X45CrSi9-3") UNS United States · 1 - [S65007 Indicative](/materials/uns/s65007 "UNS S65007") AISI / SAE United States · 4 - **AISI HNV 3 This grade’s own name** - [HNV 3 Indicative](/materials/aisi-sae/hnv-3 "AISI / SAE HNV 3") - [HW3 Indicative](/materials/aisi-sae/hw3 "AISI / SAE HW3") - [S65007 Indicative](/materials/uns/s65007 "AISI / SAE S65007") BS United Kingdom · 4 - [401S45 Indicative](/materials/bs/401s45 "BS 401S45") - [401S45EN52 Indicative](/materials/bs/401s45en52 "BS 401S45EN52") - [En 52 Indicative](/materials/bs/en-52 "BS En 52") - [X45CrSi9-3 Indicative](/materials/din-en/x45crsi9-3 "BS X45CrSi9-3") AFNOR France · 2 - [X45CrSi9-3 Indicative](/materials/din-en/x45crsi9-3 "AFNOR X45CrSi9-3") - [Z45CS9 Indicative](/materials/afnor/z45cs9 "AFNOR Z45CS9") UNE Spain · 8 - [F.322 Indicative](/materials/une/f-322 "UNE F.322") - [F.322 (s Indicative](/materials/une/f-322-s "UNE F.322 (s") - [F.3220 Indicative](/materials/une/f-3220 "UNE F.3220") - [F.3220-X 4 ScrSi 09-03 Indicative](/materials/une/f-3220-x-4-scrsi-09-03 "UNE F.3220-X 4 ScrSi 09-03") - [Mo) Indicative](/materials/une/mo "UNE Mo)") - [X45CrSi09-03 Indicative](/materials/une/x45crsi09-03 "UNE X45CrSi09-03") - [X45CrSi9-3 Indicative](/materials/din-en/x45crsi9-3 "UNE X45CrSi9-3") - [X4ScrSi09-03 Indicative](/materials/une/x4scrsi09-03 "UNE X4ScrSi09-03") ISO International · 1 - [X50CrSi8-2 Indicative](/materials/iso/x50crsi8-2 "ISO X50CrSi8-2") JIS Japan · 2 - [SUH1 Indicative](/materials/jis/suh1 "JIS SUH1") - [SUH2 Indicative](/materials/jis/suh2 "JIS SUH2") GB China · 4 - [4Cr9Si2 Indicative](/materials/gb/4cr9si2 "GB 4Cr9Si2") - [4Cr9Si8 Indicative](/materials/din-en/4cr9si8 "GB 4Cr9Si8") - [X45CrSi93 Indicative](/materials/din-en/x45crsi9-3 "GB X45CrSi93") - [ZG40Cr9Si2 Indicative](/materials/gb/zg40cr9si2 "GB ZG40Cr9Si2") GOST Russia / CIS · 4 - [40Ch9S2 Indicative](/materials/gost/40ch9s2 "GOST 40Ch9S2") - [40KH9S2 Indicative](/materials/gost/40kh9s2 "GOST 40KH9S2") - [40Х9С2 Indicative](/materials/gost/40kh9s2 "GOST 40Х9С2") - [4Х9С2 Indicative](/materials/gost/4kh9s2 "GOST 4Х9С2") UNI Italy · 1 - [X45CrSi8 Indicative](/materials/uni/x45crsi8 "UNI X45CrSi8") ČSN Czechia · 1 - [17115 Indicative](/materials/csn/17115 "ČSN 17115") PN Poland · 1 - [H9S2 Indicative](/materials/pn/h9s2 "PN H9S2") MSZ Hungary · 1 - [SZ3 Indicative](/materials/msz/sz3 "MSZ SZ3") STAS Romania · 1 - [45SiCr90 Indicative](/materials/stas/45sicr90 "STAS 45SiCr90") BDS Bulgaria · 3 - [4Ch9S2 Indicative](/materials/bds/4ch9s2 "BDS 4Ch9S2") - [4Ch9S3 Indicative](/materials/bds/4ch9s3 "BDS 4Ch9S3") - [X45CrSi9-3 Indicative](/materials/din-en/x45crsi9-3 "BDS X45CrSi9-3") KS South Korea · 1 - [STR1 Indicative](/materials/ks/str1 "KS STR1") Every designation on file is listed — no truncation, no “+ n more”. Each one is itself a route that leads back here. ## Chemical composition 7 elements on file · weight % What this alloy is Fe Cr Si Mn Iron — the balance, never listed by a standard — 86.4 % Cr — 9 % Si — 3 % Mn — 0.6 % Traces & impurities · 1 % Logarithmic scale, 0.01 % to 100 % — every value here compares directly, decade by decade. | Element | % by weight | |---|---| | C | 0.4–0.5 | | Si | 2.7–3.3 — Unusual | | Mn | ≤ 0.6 | | P | 0.04 | | S | 0.03 | | Cr | 8–10 | | Ni | 0.5 | Carbon Silicon Manganese Phosphorus Sulfur Chromium Nickel 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 | 0,40-0,50 | 0.400 | 0.500 | Range | | Si | 2,70-3,30 | 2.700 | 3.300 | Range | | P | 0,04 | 0.040 | 0.040 | Exact | | S | 0,03 | 0.030 | 0.030 | Exact | | Cr | 8,00-10,0 | 8.000 | 10.000 | Range | | Mn | ≤0,60 | — | 0.600 | Max | | Ni | 0,5 | 0.500 | 0.500 | Exact | 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: Mo. ## Physical & mechanical properties Density 7,7 g/cm³ Exact Transformation point Ac1 900 °C Exact Transformation point Ac3 970 °C Exact · Ac3(Acm) Transformation point Ar3 970 °C Exact · Ar3(Arcm) Transformation point Ar1 810 °C Exact Weldability not suitable for welding As published: is not used. Flake sensitivity not susceptible As published: not predisposed Temper brittleness susceptible As published: predisposed 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 6 conditions · 21 values By delivery state**no delivery state stated** source `steeljis` | Delivery state | Rm N/mm² | Re N/mm² | A% | Z% | HB | |---|---|---|---|---|---| | Bars/Rods Quenching and tempering | 930 | 685 | 15 | 35 | — | | Quenched and tempered | — | — | — | — | 269 | By thickness**Quenched and tempered** source `steelnumber` | Thickness mm | Z% | |---|---| | ≤ 40 | 40 | By delivery state**Quenched and tempered** source `steelnumber` | Delivery state | HB | |---|---| | Quenched and tempered | 266 – 325 | By delivery state**Soft annealed** source `steelnumber` | Delivery state | HB | |---|---| | Soft annealed | 300 | By heat-treated condition**no delivery state stated** source `splav` | Heat-treated condition | Rm N/mm² | Re N/mm² | A5% | Z% | |---|---|---|---|---| | Bar, GOST 5949-75 | 740 | 440 | 15 | 35 | At temperature**no delivery state stated** source `splav` | Temperature °C | Density g/cm³ | Thermal expansion coefficient 10^-6/K | Thermal conductivity W/(m·K) | |---|---|---|---| | 20 | 7.63 | — | — | | 100 | 7.61 | 11.1 | 17 | | 200 | 7.58 | 12.7 | — | | 300 | — | — | 20 | | 400 | 7.51 | 14.3 | — | 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 1.4, a shared category, and a published range for Cr / Si 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. [X40CrSiMo10-2 1.4731 Cr 9,50-11,5 · Si 2,00-3,00 - ΔCr 1.50 - ΔSi 0.50 - 26 designations](/materials/din-en/x40crsimo10-2 "X40CrSiMo10-2") ## 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. 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