Printed from Kezuriba (kezuriba.net/en/materials/sus420j2/)
SUS420J2
ISO P (steel)Stainless steel bars (martensitic, 13Cr, high C). 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 | SUS420J2 | JIS G 4303 (bars) / JIS G 4304 and G 4305 (sheets and plates) | — | |
| AISI | 420 | UNS S42000 | close | Agrees in 2+ sources[6][7][8][9] |
| EN | X30Cr13 | 1.4028 | close | Agrees in 2+ sources[6][9][8][7] |
| ISO | X30Cr13ISO 15510 number 4028-420-00-I | 4028-420-00-I | close | One source / reference[6] |
| GB | 30Cr13former grade 3Cr13; the unified numerical code in the Japan Stainless Steel Association's table is S42030 | S42030 | close | Agrees in 2+ sources[8][7][6] |
Differences between the equivalents (from the sources)
- AISI 420: Agrees between the Japan Stainless Steel Association's comparison table (based on ISO 15510:2010), Kyocera's comparison table, Baosteel's catalog and DEW's 1.4028 datasheet (JIS 420J2, AISI 420). Nippon Steel's cold-rolled steel sheet catalog also gives ASTM 420 as the similar standard. However, Sanyo Special Steel's composition table writes AISI 420 only in the SUS420J1 row, and the AISI column of SUS420J2 is blank (UNS S42000 is given for both). AISI 420 spans both SUS420J1 and SUS420J2
- EN X30Cr13: Agrees between the Japan Stainless Steel Association's comparison table, Kyocera (DIN X30Cr13), Baosteel and DEW. 1.4028 in EN 10088-3 has C 0.26–0.35 and Cr 12.0–14.0 (DEW), so its upper limit of C is lower than JIS (C 0.26–0.40)
- GB 30Cr13: In Baosteel's stainless steel long products catalog, 30Cr13 (formerly 3Cr13) = S42000, 420 = SUS420J2 = 1.4028. Kyocera's comparison table also matches the former grade 3Cr13 with SUS420J2. S42030 appears only in the Japan Stainless Steel Association's table. The grade name in GB/T 20878-2024 was not confirmed
⚗Chemical composition (mass %)
As specified in JIS (Japan Stainless Steel Association JIS steel grade composition table / Aichi Steel and Sanyo Special Steel catalogs)
⚖Density
7.75 g/cm³
The "basic mass" of 7.75 in Nippon Steel's cold-rolled steel sheet catalog and the 7750 kg/m³ in Aichi Steel's catalog agree. Sanyo Special Steel gives a specific gravity of 7.75 under "SUS 420". DEW (EN 1.4028) gives 7.70 kg/dm³
Calculate weight in SUS420J2 →💪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) quenched and tempered: quenching 920–980℃ oil cooled / tempering 600–750℃ rapid cooling | ≥ 740 | ≥ 540 | ≥ 12 | HBW 217 min | JIS specified value (as listed in the Sanyo Special Steel and Aichi Steel catalogs) Agrees in 2+ sources[4][2] |
| Cold-rolled steel sheet (JIS G 4305, annealed) | ≥ 540 | ≥ 225 | ≥ 18 | HV 247 max | JIS specified value (sheet; as listed in Nippon Steel's stainless cold-rolled steel sheet catalog) One source / reference[5] |
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), SUS420J2 is placed in the same group as SUS303Se and ranks below SUS416, SUS410F2, SUS430F, SUS303, SUS420F and SUS420F2 (the table is divided into an upper section containing free-machining steels and a lower section with SUS304, SUS316 and others, and it cannot be read from the table whether the upper and lower sections may be compared on the same scale)[10]
- DEW's datasheet rates the machinability (Spanbarkeit) of 1.4028 as "mittel" (medium) and also states automatic lathe machining (Automatenbearbeitung) is "possible"[9]
- Aichi Steel describes SUS420F as "SUS420J2 with S and P added to improve machinability" and SUS420F2 as "with Pb added to improve machinability", and these serve as alternative grades when easier cutting is required[2]
📚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/martensite/
- aichi-steel.co.jp https://www.aichi-steel.co.jp/_assets/dl/products/stainless_company/stainless_catalog.pdf
- sandvik.coromant.com https://www.sandvik.coromant.com/en-us/knowledge/materials/workpiece-materials
- sanyo-steel.co.jp https://www.sanyo-steel.co.jp/english/product/special_steel/images/pdf/stainless_201712.pd…
- nipponsteel.com https://www.nipponsteel.com/product/catalog_download/__icsFiles/afieldfile/2025/10/06/S008…
- jssa.gr.jp https://www.jssa.gr.jp/contents/products/standards/comparisons/
- kyocera.co.jp https://www.kyocera.co.jp/prdct/tool/wp-content/uploads/2016/06/R_2016.pdf
- esales.baosteel.com http://esales.baosteel.com/bsi/ologin/pdf/cpscxz/cpscxz1601.pdf
- swisssteel-group.com https://swisssteel-group.com/content-media/documents/Data-Sheets/Stainless-Steel/1.4028_de…
- jssa.gr.jp https://www.jssa.gr.jp/contents/about_stainless/selections/performances/
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