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SUS304
ISO M (stainless steel)Stainless steel bars (austenitic). Standard: JIS G 4303 (bars) / JIS G 4304 and G 4305 (sheets and plates).
🌐International equivalents
“Close” means composition or properties are not exactly the same. Before substituting, check the values in each standard.
| System | Designation | Number | Relation | Confidence |
|---|---|---|---|---|
| JIS | SUS304 | JIS G 4303 (bars) / JIS G 4304 and G 4305 (sheets and plates) | — | |
| AISI | 304 | UNS S30400 | equivalent | Agrees in 2+ sources[10][9] |
| EN | X5CrNi18-10 | 1.4301 | close | Agrees in 2+ sources[10][9] |
| ISO | X5CrNi18-10ISO 15510 number 4301-304-00-I | 4301-304-00-I | close | One source / reference[10] |
| GB | 06Cr19Ni10former grade 0Cr18Ni9; the unified numerical code in the Japan Stainless Steel Association's table is S30408 | S30408 | close | Agrees in 2+ sources[11][12][10] |
Differences between the equivalents (from the sources)
- AISI 304: Agrees between the Japan Stainless Steel Association's comparison table of JIS and related foreign standards (based on ISO 15510:2010) and DEW's datasheet. However, 304 in ASTM A276 has Cr 18.0–20.0 and Ni 8.0–11.0, so its upper limit of Ni differs from JIS (10.50) (as stated by DEW)
- EN X5CrNi18-10: 1.4301 in EN 10088-3 has C ≤0.07, Cr 17.5–19.5, Ni 8.0–10.5 and N ≤0.10, so its ranges differ slightly from JIS (C ≤0.08, Cr 18.00–20.00)
- GB 06Cr19Ni10: In the grade comparison in Baosteel's stainless steel long products catalog, 06Cr19Ni10 = S30400, 304 = SUS304 = 1.4301. Kyocera's comparison table also matches 0Cr18Ni9 with SUS304. S30408 appears only in the Japan Stainless Steel Association's table (based on ISO 15510). GB/T 20878-2024 is the current edition (the 2007 edition was withdrawn); the grade name in the new edition was not confirmed
⚗Chemical composition (mass %)
As specified in JIS (Japan Stainless Steel Association JIS steel grade composition table / Nippon Steel stainless steel bars)
⚖Density
7.93 g/cm³
"Basic mass" of 7.93 in Nippon Steel's catalog. DEW (EN 1.4301) gives 7.9 kg/dm³, a rounded value, so there is no contradiction
Calculate weight in SUS304 →💪Mechanical properties
“Reference” values are not specified minimums from the standard but figures published by makers and others.
| Condition | Tensile MPa | Yield MPa | Elong. % | Hardness | Type of value |
|---|---|---|---|---|---|
| Bars (JIS G 4303) solution heat treated 1010–1150℃, rapid cooling | ≥ 520 | ≥ 205 | ≥ 40 | HBW 187 max / HRBW 90 max / HV 200 max | JIS specified value (as listed in the Sanyo Special Steel and Aichi Steel catalogs) Agrees in 2+ sources[6][7] |
| Cold-rolled steel sheet (JIS G 4305, solution heat treated) | ≥ 520 | ≥ 205 | ≥ 40 | HV 200 max | JIS specified value (sheet; as listed in Nippon Steel's stainless cold-rolled steel sheet catalog) One source / reference[8] |
1 MPa ≈ 145 psi (0.145 ksi). Hardness conversion · unit converter
🔧Machinability notes (as stated in the sources)
- In the Japan Stainless Steel Association's machinability comparison (from the Stainless Steel Data Book, Home Appliances volume), among the austenitic grades SUS304 is in the low-machinability group and the free-machining SUS303 is in the high group[13]
- Sandvik Coromant states that for austenitic stainless steels, work hardening makes the surface and chips hard and causes notch wear, and adhesion and built-up edge also occur[3]
- DEW's datasheet rates the machinability (Spanbarkeit) of 1.4301 as "mittel" (medium)[9]
- In Daido Steel's drill life test (SKH51 φ5, feed 0.07 mm/rev, 15 mm deep blind hole, dry), the cutting speed equivalent to a tool life of 1000 mm is 14 m/min for SUS304 (SUS303: 23, C3604: >300)[14]
📚Sources
Primary sources (public documents from makers, industry associations and standards bodies), numbered where each value is cited. Many are in Japanese.
- jssa.gr.jp https://www.jssa.gr.jp/contents/products/standards/jis/austenite/
- nipponsteel.com https://www.nipponsteel.com/product/catalog_download/__icsFiles/afieldfile/2025/10/06/S011…
- sandvik.coromant.com https://www.sandvik.coromant.com/en-us/knowledge/materials/workpiece-materials
- kyocera.co.jp https://www.kyocera.co.jp/prdct/tool/wp-content/uploads/2014/07/2024-2026_A.pdf
- sumitool.com https://www.sumitool.com/downloads/cutting-tools/general-catalog/assets/pdf/a.pdf
- sanyo-steel.co.jp https://www.sanyo-steel.co.jp/english/product/special_steel/images/pdf/stainless_201712.pd…
- aichi-steel.co.jp https://www.aichi-steel.co.jp/_assets/dl/products/stainless_company/stainless_catalog.pdf
- nipponsteel.com https://www.nipponsteel.com/product/catalog_download/__icsFiles/afieldfile/2025/10/06/S008…
- swisssteel-group.com https://swisssteel-group.com/content-media/documents/Data-Sheets/Stainless-Steel/1.4301_de…
- jssa.gr.jp https://www.jssa.gr.jp/contents/products/standards/comparisons/
- esales.baosteel.com http://esales.baosteel.com/bsi/ologin/pdf/cpscxz/cpscxz1601.pdf
- kyocera.co.jp https://www.kyocera.co.jp/prdct/tool/wp-content/uploads/2016/06/R_2016.pdf
- jssa.gr.jp https://www.jssa.gr.jp/contents/about_stainless/selections/performances/
- daido.co.jp https://www.daido.co.jp/products/stainless/starcut13cr/starcut13cr.pdf
Other materials
Stainless steel