--- title: "304Cu — Stainless steels" description: "304Cu in AISI / SAE: material number 1.4567, also listed as X3CrNiCu18-9-4. Category: Stainless steels. Designations recorded for this grade: 16." canonical: https://steelequivalents.com/materials/aisi-sae/304cu language: en robots: index, follow og_type: website type: material-detail language_alternates: en: https://steelequivalents.com/materials/aisi-sae/304cu.md cs: https://steelequivalents.com/cs/materiály/aisi-sae/304cu.md de: https://steelequivalents.com/de/werkstoffe/aisi-sae/304cu.md es: https://steelequivalents.com/es/materiales/aisi-sae/304cu.md fr: https://steelequivalents.com/fr/matériaux/aisi-sae/304cu.md hu: https://steelequivalents.com/hu/anyagok/aisi-sae/304cu.md it: https://steelequivalents.com/it/materiali/aisi-sae/304cu.md nl: https://steelequivalents.com/nl/materialen/aisi-sae/304cu.md pl: https://steelequivalents.com/pl/materiały/aisi-sae/304cu.md pt: https://steelequivalents.com/pt/materiais/aisi-sae/304cu.md ru: https://steelequivalents.com/ru/материалы/aisi-sae/304cu.md tr: https://steelequivalents.com/tr/malzemeler/aisi-sae/304cu.md zh: https://steelequivalents.com/zh/材料/aisi-sae/304cu.md ja: https://steelequivalents.com/ja/材料/aisi-sae/304cu.md ar: https://steelequivalents.com/ar/المواد/aisi-sae/304cu.md ko: https://steelequivalents.com/ko/재료/aisi-sae/304cu.md pt-br: https://steelequivalents.com/pt-br/materiais/aisi-sae/304cu.md hi: https://steelequivalents.com/hi/सामग्री/aisi-sae/304cu.md content_hash: sha256:4df1adfdbf114c86e6fbf6f90c878535d01680143cd76a3d9b0af6c746dc130f generated: 2026-09-21 --- > **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/304cu > Canonical URL: https://steelequivalents.com/materials/aisi-sae/304cu > 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 · 16 designations # 304Cu 304Cu is a designation in AISI / SAE for the material held under material number 1.4567, also listed as X3CrNiCu18-9-4. It is a material in the category Stainless steels. We list 16 designations recorded for this grade, in the standards DIN / EN, UNS, AISI / SAE, ASTM, BS, AFNOR, ISO, JIS and GB. - [*Material no.* **1.4567**](/materials/material-no/1.4567 "Material no.: 1.4567") - [*Category* **Stainless steels · 468 grades**](/categories/stainless-steels "Category: Stainless steels · 468 grades") - *Designations* **16** [Search](/search "Steel grade search")[Inquiry](/inquiry?material=79973df5-8f28-4703-8138-3aef52ae72ab&designation=3aceb6ab-6879-4e70-a6ce-3a4d46f94ba8 "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/aisi-sae/304cu.pdf "Datasheet as PDF") ## If you came for one of these The most-used names for this grade. - [DIN / EN X3CrNiCu18-9-4 This grade’s own name](/materials/din-en/x3crnicu18-9-4 "DIN / EN X3CrNiCu18-9-4") - [UNS S30430 This grade’s own name · 2 grades on that route](/materials/uns/s30430 "UNS S30430") - [AISI / SAE XM-7 This grade’s own name](/materials/aisi-sae/xm-7 "AISI / SAE XM-7") ## About Stainless steels Stainless steels are corrosion-resistant alloy steels whose chromium content promotes a protective passive surface film. They are used for equipment, structures and components exposed to moisture, chemicals or hygienic service, with different alloy compositions selected for corrosion resistance, strength, formability or weldability. This describes the material class as a whole. Always confirm the individual grade against the standard before ordering. ## Also known as 16 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 - [X 3 CrNiCu 18 9 This grade’s own name Withdrawn](/materials/din-en/x-3-crnicu-18-9 "DIN / EN X 3 CrNiCu 18 9") - [X3CrNiCu18-9-4 This grade’s own name](/materials/din-en/x3crnicu18-9-4 "DIN / EN X3CrNiCu18-9-4") UNS United States · 1 - [S30430 This grade’s own name](/materials/uns/s30430 "UNS S30430") AISI / SAE United States · 3 - **304Cu This grade’s own name** - [S30430 Indicative](/materials/uns/s30430 "AISI / SAE S30430") - [XM-7 This grade’s own name](/materials/aisi-sae/xm-7 "AISI / SAE XM-7") ASTM United States · 1 - **304Cu Indicative** BS United Kingdom · 2 - [304S17 Indicative](/materials/bs/304s17 "BS 304S17") - [394S17 Indicative](/materials/bs/394s17 "BS 394S17") AFNOR France · 3 - [Z3CNU18-09FF Indicative](/materials/afnor/z3cnu18-09ff "AFNOR Z3CNU18-09FF") - [Z3CNU18-10 Indicative](/materials/afnor/z3cnu18-10 "AFNOR Z3CNU18-10") - [Z3CNU18-10FF Indicative](/materials/afnor/z3cnu18-10ff "AFNOR Z3CNU18-10FF") ISO International · 1 - [D26 Indicative](/materials/iso/d26 "ISO D26") JIS Japan · 2 - [SUSXM7 Indicative](/materials/jis/susxm7 "JIS SUSXM7") - [XM-7 Indicative](/materials/aisi-sae/xm-7 "JIS XM-7") GB China · 1 - [0Cr18Ni9Cu3 Indicative](/materials/gb/0cr18ni9cu3 "GB 0Cr18Ni9Cu3") 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 Cr Ni Cu Iron — the balance, never listed by a standard — 65.8 % Cr — 18 % Ni — 9.5 % Cu — 3.5 % Traces & impurities · 3.2 % Logarithmic scale, 0.01 % to 100 % — every value here compares directly, decade by decade. | Element | % by weight | |---|---| | C | ≤ 0.04 | | Si | ≤ 1 | | Mn | ≤ 2 | | P | 0.045 | | S | 0.015 | | Cr | 17–19 | | Ni | 8.5–10.5 | | Cu | 3–4 | | N | 0.11 | Carbon Silicon Manganese Phosphorus Sulfur Chromium Nickel Copper Nitrogen 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 | ≤0,04 | — | 0.040 | Max | | N | 0,11 | 0.110 | 0.110 | Exact | | Si | ≤1,00 | — | 1.000 | Max | | P | 0,045 | 0.045 | 0.045 | Exact | | S | 0,015 | 0.015 | 0.015 | Exact | | Cr | 17,0-19,0 | 17.000 | 19.000 | Range | | Mn | ≤2,00 | — | 2.000 | Max | | Ni | 8,50-10,5 | 8.500 | 10.500 | Range | | Cu | 3,00-4,00 | 3.000 | 4.000 | 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: Mo. ## Physical & mechanical properties Density 7,9 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 2 conditions · 11 values By delivery state**no delivery state stated** source `steeljis` | Delivery state | Rm N/mm² | Re N/mm² | A% | Z% | HB | HRB | HV | |---|---|---|---|---|---|---|---| | Plate/Sheet Hot-rolled | 450 | 155 | 40 | — | — | — | — | | Bars/Rods | 480 | 175 | 40 | 60 | — | — | — | | Hot-rolled | — | — | — | — | 187 | 90 | 200 | By delivery state**Soft annealed** source `steelnumber` | Delivery state | HB | |---|---| | Soft annealed | 215 | 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 / Ni 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. [X 12 CrNi 18 8 1.4300 Cr 17,0-19,0 · Ni 8,00-10,0 - ΔCr 0.00 - ΔNi 0.50 - 76 designations](/materials/din-en/x-12-crni-18-8 "X 12 CrNi 18 8")[1.4305 1.4305 Cr 17,0-19,0 · Ni 8,00-10,0 - ΔCr 0.00 - ΔNi 0.50 - 77 designations](/materials/material-no/1.4305 "1.4305")[X9CrNi18-9 1.4325 Cr 17,0-19,0 · Ni 8,00-10,0 - ΔCr 0.00 - ΔNi 0.50 - 51 designations](/materials/din-en/x9crni18-9 "X9CrNi18-9")[1.4301 1.4301 Cr 17,5-19,5 · Ni 8,00-10,5 - ΔCr 0.50 - ΔNi 0.25 - 170 designations](/materials/material-no/1.4301 "1.4301")[1.4307 1.4307 Cr 17,5-19,5 · Ni 8,00-10,5 - ΔCr 0.50 - ΔNi 0.25 - 88 designations](/materials/material-no/1.4307 "1.4307")[1.4311 1.4311 Cr 17,5-19,5 · Ni 8,50-11,50 - ΔCr 0.50 - ΔNi 0.50 - 55 designations](/materials/material-no/1.4311 "1.4311") ## 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=79973df5-8f28-4703-8138-3aef52ae72ab&designation=3aceb6ab-6879-4e70-a6ce-3a4d46f94ba8 "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/aisi-sae/304cu.pdf "Datasheet as PDF")