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S45C
ISO P (steel)Carbon steels for machine structural use. Standard: JIS G 4051 (JIS G 4051:2026).
🌐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 | S45C | JIS G 4051 | — | |
| AISI/SAE | 1045 | UNS G10450 | close | Agrees in 2+ sources[10][11][12][6] |
| EN | C45Eformerly DIN Ck45 | 1.1191 | close | One source / reference[10][13] |
| EN | C45 | 1.0503 | close | One source / reference[14] |
| GB | 45GB/T 699 high-quality carbon structural steels; GB/T 699-2015 is the current edition | close | One source / reference[11][15] |
Differences between the equivalents (from the sources)
- AISI/SAE 1045: The material designation comparison tables of Mitsubishi Materials and Kyocera list S45C and 1045 in the same row. UNS G10450 is from the SAE specification table in Nippon Steel's "Bar and Wire Rod" catalog. The C range of SAE 1045 is 0.43–0.50 (SAE1045 column of Nippon Steel U006), which differs from S45C (0.42–0.48)
- EN C45E: Mitsubishi Materials' comparison table places S45C in the same row as 1.1191 Ck45. C45E in EN 10083-2 has C 0.42–0.50, Si ≤0.40, Mn 0.50–0.80, P ≤0.025, S ≤0.035 (thyssenkrupp Materials Schweiz), so the Mn and Si ranges differ from JIS
- EN C45: C45 in EN 10083-2: C 0.42–0.50, Si ≤0.40, Mn 0.50–0.80, P ≤0.045, S ≤0.045, Cr ≤0.40, Mo ≤0.10, Ni ≤0.40, Cr+Mo+Ni ≤0.63 (Saarstahl). The upper limits for P and S are looser than in JIS
- GB 45: From the GB column of Kyocera's metal material designation comparison table. GB-side composition could not be obtained from primary sources, so no comparison was made
⚗Chemical composition (mass %)
As specified in JIS G 4051
| Element | Range | Confidence |
|---|---|---|
| C | 0.42 – 0.48 | Agrees in 2+ sources[6][7][8] |
| Si | 0.15 – 0.35 | Agrees in 2+ sources[6][7][8] |
| Mn | 0.6 – 0.9 | Agrees in 2+ sources[6][7][8] |
| P | ≤ 0.03 | Agrees in 2+ sources[6][7][8] |
| S | ≤ 0.035 | Agrees in 2+ sources[6][7][8] |
| Cu | ≤ 0.3 | Agrees in 2+ sources[6][7][8] |
| Ni | ≤ 0.2 | Agrees in 2+ sources[6][7][8] |
| Cr | ≤ 0.2 | Agrees in 2+ sources[6][7][8] |
| Ni+Cr | ≤ 0.35 | Agrees in 2+ sources[6][7][8] |
Note: By agreement between the parties, Cr may be less than 0.30% and Ni+Cr less than 0.45%. Elements not listed in the table must not be added intentionally, except for the purpose of finishing the molten steel (note from the Kobe Steel specification table, JIS G 4051 2016 revision)
⚖Density
7.85 g/cm³
One source / reference[9]
No value specific to S45C was found. The mass calculation formula in Nippon Steel's hot-rolled steel sheet catalog uses 7.85 as the density of steel (treated as a reference)
Calculate weight in S45C →💪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 |
|---|---|---|---|---|---|
| Normalized (N) 820–870°C air cool | ≥ 570 | ≥ 345 | ≥ 20 | HB 167-229 | Reference value (from "Data examples for carbon steels for machine structural use (reference)" in the manufacturer's specification table. Not a JIS specified value) Agrees in 2+ sources[7][8] |
| Annealed (A) about 810°C furnace cool | — | — | — | HB 137-170 | Reference value (same as above) Agrees in 2+ sources[7][8] |
| Quenched and tempered (H) 820–870°C water quench / 550–650°C rapid cool | ≥ 690 | ≥ 490 | ≥ 17 | HB 201-269 | Reference value (same as above. Sanyo Special Steel also gives an effective diameter of 37 mm) Agrees in 2+ sources[7][8] |
1 MPa ≈ 145 psi (0.145 ksi). Hardness conversion · unit converter
📚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_04051_000_000_2026_j_ed10_ch.pdf
- webdesk.jsa.or.jp https://webdesk.jsa.or.jp/preview/pre_jis_g_04051_000_000_2023_j_ed10_ch.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
- nipponsteel.com https://www.nipponsteel.com/product/catalog_download/__icsFiles/afieldfile/2025/09/10/U006…
- kobelco.co.jp https://www.kobelco.co.jp/products/steel-aluminum/wirerod/pdf/202012_wirerod_standard.pdf
- sanyo-steel.co.jp https://www.sanyo-steel.co.jp/product/special_steel/images/pdf/akahon_201906.pdf
- nipponsteel.com https://www.nipponsteel.com/product/catalog_download/__icsFiles/afieldfile/2025/09/10/U001…
- mitsubishicarbide.net https://www.mitsubishicarbide.net/contents/mhg/ru/manual/material_cross_reference.pdf
- kyocera.co.jp https://www.kyocera.co.jp/prdct/tool/wp-content/uploads/2016/06/R_2016.pdf
- nipponsteel.com https://www.nipponsteel.com/product/catalog_download/__icsFiles/afieldfile/2026/04/23/B001…
- ucpcdn.thyssenkrupp.com https://ucpcdn.thyssenkrupp.com/_binary/UCPthyssenkruppBAMXSchweiz/de/downloads/werkstoffd…
- en.saarstahl.com https://en.saarstahl.com/app/uploads/2024/03/20160401102929-0503_C45.pdf
- openstd.samr.gov.cn https://openstd.samr.gov.cn/bzgk/gb/std_list?p.p1=0&p.p2=GB/T%20699
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