Printed from Kezuriba (kezuriba.net/en/materials/ss400/)
SS400
ISO P (steel)Rolled steels for general structure. Standard: JIS G 3101 (JIS G 3101:2024).
🌐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 | SS400 | JIS G 3101 | — | |
| ASTM | A36 / A283 Gr.D | close | One source / reference[10] | |
| EN | S275JREN 10025-2 | 1.0044 | close | One source / reference[10] |
| ISO | ISO 630-1/630-2international standards corresponding to JIS G 3101:2024, MOD | Corresponding international standard (MOD = modified) | One source / reference[1] | |
| GB | Q235GB/T 700-2006 carbon structural steels, current) is often given, but it could not be confirmed in primary sources, including grades A/B | — | Not confirmed[11] |
Differences between the equivalents (from the sources)
- ASTM A36 / A283 Gr.D: Listed in the same row as SS400 in the standards correspondence table of Nippon Steel's "Plates" catalog. ASTM A36 specifies C, Mn, etc., so its composition requirements differ from SS400, for which only P and S are specified. UNS K02600 (A36) could not be confirmed in primary sources
- EN S275JR: The standards correspondence table in Nippon Steel's "Plates" catalog lists SS400 and BS EN10025 Gr.S275JR in the same row. Material number 1.0044 is the number in EN 10025-2 (the catalog gives no number). Some sources match S235JR instead, so the correspondence is not consistent
- GB Q235: GB/T 700 is a standard that adopts ISO, so its full text cannot be viewed on openstd. The composition of Q235 also could not be obtained from primary sources
⚗Chemical composition (mass %)
As specified in JIS G 3101
⚖Density
7.85 g/cm³
One source / reference[7]
7.85 is used as the density of steel in the coil mass formula (W = π/4 × ω × 7.85 × 0.97 × …) in Nippon Steel's hot-rolled steel sheet catalog. No density table for SS400 alone was found
Calculate weight in SS400 →💪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 |
|---|---|---|---|---|---|
| As hot-rolled (steel plates, strip, flat bars, shapes; thickness ≤16 mm) | 400-510 | ≥ 245 | Thickness ≤5 mm (No. 5 test piece) >=21 / thickness over 5 to 16 mm (No. 1A) >=17 | — | JIS specified value Agrees in 2+ sources[6][7] |
| As hot-rolled (steel plates, strip, flat bars, shapes; thickness over 16 to 40 mm) | 400-510 | ≥ 235 | ≥ 21 (No. 1A) | — | JIS specified value One source / reference[6][9] |
| As hot-rolled (steel plates, strip, flat bars, shapes; thickness over 40 to 100 mm) | 400-510 | ≥ 215 | ≥ 23 (No. 4, thickness over 40 mm) | — | JIS specified value One source / reference[6][9] |
| As hot-rolled (steel bars; diameter or distance across flats ≤16 mm) | 400-510 | ≥ 245 | Diameter ≤25 mm (No. 2) >=20 / diameter over 25 mm (No. 14A) >=22 | — | JIS specified value One source / reference[6] |
| As hot-rolled (steel bars; diameter over 16 to 40 / over 40 to 100 / over 100 mm) | 400-510 | ≥ 235 / >=215 / >=205 | Diameter ≤25 mm (No. 2) >=20 / diameter over 25 mm (No. 14A) >=22 | — | JIS specified value One source / reference[6] |
1 MPa ≈ 145 psi (0.145 ksi). Hardness conversion · unit converter
🔧Machinability notes (as stated in the sources)
📚Sources
Primary sources (public documents from makers, industry associations and standards bodies), numbered where each value is cited. Many are in Japanese.
- webdesk.jsa.or.jp https://webdesk.jsa.or.jp/preview/pre_jis_g_03101_000_000_2024_j_ed10_ch.pdf
- webdesk.jsa.or.jp https://webdesk.jsa.or.jp/link/lib/jis_contents/319095.pdf
- 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
- jisf.or.jp https://www.jisf.or.jp/business/standard/jis/documents/docs_kouzai_0400JISG3101_20230726.p…
- nipponsteel.com https://www.nipponsteel.com/product/catalog_download/__icsFiles/afieldfile/2025/09/10/U001…
- kobelco.co.jp https://www.kobelco.co.jp/products/steel-aluminum/wirerod/pdf/202012_wirerod_standard.pdf
- dkc.jp https://www.dkc.jp/plan_dkchp/21/21_65/65_21-11.pdf
- nipponsteel.com https://www.nipponsteel.com/product/catalog_download/__icsFiles/afieldfile/2025/10/06/A001…
- openstd.samr.gov.cn https://openstd.samr.gov.cn/bzgk/gb/newGbInfo?hcno=728DD12CB05533A5AE309BF47E6CBAA0
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