Printed from Kezuriba (kezuriba.net/en/materials/scm435/)
SCM435
ISO P (steel)Alloy steels for machine structural use (chromium-molybdenum steels). Standard: JIS G 4053.
🌐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 | SCM435 | JIS G 4053 | — | |
| AISI/SAE | 4137some sources give 4135 | UNS G41370 (4135 is G41350) | close | Agrees in 2+ sources[9][10][2] |
| EN | 34CrMo4 | 1.7220 | close | One source / reference[10] |
| GB | 35CrMoGB/T 3077 alloy structural steels; GB/T 3077-2015 is the current edition | close | One source / reference[9][11] |
Differences between the equivalents (from the sources)
- AISI/SAE 4137: Kyocera's metal material designation comparison table places SCM435 alongside AISI 4137. DEW and Saarstahl match EN 34CrMo4 with SAE 4135 and 4137. The UNS numbers are from the SAE standards table in Nippon Steel's "Bars and Wire Rods" catalog (one company only)
- EN 34CrMo4: DEW's datasheet lists SCM432 and SCM435 H in its JIS column. 34CrMo4 in EN 10083-3 has C 0.30–0.37, Si ≤0.40, Mn 0.60–0.90, P ≤0.025, S ≤0.035, Cr 0.90–1.20, Mo 0.15–0.30 (DEW), so the ranges for C and Si differ from JIS
- GB 35CrMo: From the GB column of Kyocera's comparison table. Mitsubishi Materials' comparison table also lists 35CrMo in the 34CrMo4 row. GB-side composition could not be obtained from primary sources
⚗Chemical composition (mass %)
As specified in JIS G 4053
| Element | Range | Confidence |
|---|---|---|
| C | 0.33 – 0.38 | 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 | ≤ 0.03 | Agrees in 2+ sources[6][7][8] |
| Cu | ≤ 0.3 | Agrees in 2+ sources[6][7][8] |
| Ni | ≤ 0.25 | Agrees in 2+ sources[6][7][8] |
| Cr | 0.9 – 1.2 | Agrees in 2+ sources[6][7][8] |
| Mo | 0.15 – 0.30 | Agrees in 2+ sources[6][7][8] |
⚖Density
—
Not confirmed
The density of SCM435 was not found in Japanese primary sources. For reference: DEW's 34CrMo4 (1.7220) datasheet gives 7.74 kg/dm³ (a value for the EN steel; it differs from the commonly cited figure of about 7.85, so it is not adopted)
The density could not be confirmed. In the weight calculator, use “Steel, general value” or enter your own.
💪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 |
|---|---|---|---|---|---|
| Quenched and tempered (quenching 830–880℃ oil cooled / tempering 530–630℃ rapid cooling) | ≥ 930 | ≥ 785 | ≥ 15 | HB 269-331 | Reference value (from the manufacturer's standards table, "(Reference) Example material data for alloy steels for machine structural use". Not a JIS specified value) Agrees in 2+ sources[7][8] |
| Annealed approx. 830℃, furnace cooled | — | — | — | HB 174-212 | Reference value (Sanyo Special Steel; the table marks it as a reference value) One source / reference[8] |
1 MPa ≈ 145 psi (0.145 ksi). Hardness conversion · unit converter
🔧Machinability notes (as stated in the sources)
- Sandvik Coromant states that the machinability of low-alloy steels depends on the alloy content and heat treatment (hardness). SCM435 is often used quenched and tempered, and cutting conditions change greatly with hardness[3]
- DEW states that 34CrMo4 is "difficult to weld and should not be used in welded structures" (a statement about the EN steel)[10]
📚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_04053_000_000_2023_j_ed10_ch.pdf
- nipponsteel.com https://www.nipponsteel.com/product/catalog_download/__icsFiles/afieldfile/2026/04/23/B001…
- 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
- kyocera.co.jp https://www.kyocera.co.jp/prdct/tool/wp-content/uploads/2016/06/R_2016.pdf
- swisssteel-group.com https://swisssteel-group.com/content-media/documents/Data-Sheets/Engineering-Steel/1.7220_…
- mitsubishicarbide.net https://www.mitsubishicarbide.net/contents/mhg/ru/manual/material_cross_reference.pdf
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