Printed from Kezuriba (kezuriba.net/en/materials/s50c/)
S50C
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 | S50C | JIS G 4051 | — | |
| AISI/SAE | 1050Kyocera's comparison table gives 1049 | UNS G10500 (1049 is G10490) | close | One source / reference[6][9][10][11] |
| EN | C50Eformerly DIN Ck50) / C50 | 1.1206 (C50E) | close | One source / reference[9][10] |
| GB | 50GB/T 699 high-quality carbon structural steels | close | One source / reference[9] |
Differences between the equivalents (from the sources)
- AISI/SAE 1050: Nippon Steel's special steel strip catalog (U006) lists S50C and SAE1050 in the same row. The C of SAE1050 is 0.48–0.55 (same catalog), which differs from S50C (0.47–0.53). Kyocera's metal material designation comparison table matches S50C with AISI 1049 and S53C with 1050/1053, so the sources disagree. Saarstahl's C50E datasheet lists SAE 1049 and 1050 together. The UNS numbers are from the SAE standards table in Nippon Steel's "Bars and Wire Rods" catalog
- EN C50E: Kyocera's comparison table lists C50, C50E and C50R in the S50C row. Saarstahl's C50E (1.1206) datasheet gives only typical composition (C 0.50, Si 0.25, Mn 0.75, S <0.03); the composition range in EN 10083-2 could not be obtained from primary sources. The material number of C50 (1.0540) could not be confirmed in primary sources and is not given
- GB 50: From the GB column of Kyocera's comparison table only. 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 | 0.47 – 0.53 | Agrees in 2+ sources[6][2][7] |
| Si | 0.15 – 0.35 | Agrees in 2+ sources[6][2][7] |
| Mn | 0.6 – 0.9 | Agrees in 2+ sources[6][2][7] |
| P | ≤ 0.03 | Agrees in 2+ sources[6][2][7] |
| S | ≤ 0.035 | Agrees in 2+ sources[6][2][7] |
| Cu | ≤ 0.3 | Agrees in 2+ sources[6][2] |
| Ni | ≤ 0.2 | Agrees in 2+ sources[6][2] |
| Cr | ≤ 0.2 | Agrees in 2+ sources[6][2] |
| Ni+Cr | ≤ 0.35 | Agrees in 2+ sources[6][2] |
⚖Density
7.85 g/cm³
One source / reference[8]
No value specific to S50C was found. As with s45c.json, 7.85, the steel density used in the mass formula in Nippon Steel's hot-rolled steel sheet catalog, is given as a reference
Calculate weight in S50C →💪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) 810–860℃, air cooled | ≥ 610 | ≥ 365 | ≥ 18 | HB 179-235 | 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[2][7] |
| Annealed (A) approx. 800℃, furnace cooled | — | — | — | HB 143-187 | Reference value (same as above) Agrees in 2+ sources[2][7] |
| Quenched and tempered (H) 810–860℃ water quench / 550–650℃ rapid cooling | ≥ 740 | ≥ 540 | ≥ 15 | HB 212-277 | Reference value (same as above. Sanyo Special Steel also lists a ruling section of 40 mm) Agrees in 2+ sources[2][7] |
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
- kobelco.co.jp https://www.kobelco.co.jp/products/steel-aluminum/wirerod/pdf/202012_wirerod_standard.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…
- 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…
- kyocera.co.jp https://www.kyocera.co.jp/prdct/tool/wp-content/uploads/2016/06/R_2016.pdf
- saarstahl.com https://www.saarstahl.com/app/uploads/2024/03/20160226042808-1206_C50E.pdf
- nipponsteel.com https://www.nipponsteel.com/product/catalog_download/__icsFiles/afieldfile/2026/04/23/B001…
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