Printed from Kezuriba (kezuriba.net/en/materials/skd11/)
SKD11
ISO P (steel)Alloy tool steels (for cold-work dies). Standard: JIS G 4404.
🌐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 | SKD11 | JIS G 4404 | — | |
| AISI | D2 | UNS T30402 | close | Agrees in 2+ sources[9][10][11] |
| EN | X153CrMoV12 | 1.2379 | close | Agrees in 2+ sources[9][10][7] |
| GB | Cr12MoVGB/T 1299 tool and die steels; GB/T 1299-2025 is the current edition | close | Agrees in 2+ sources[12][13] | |
| GB | Cr12Mo1V1 | Close (some sources match it with SKD10) | One source / reference[13] |
Differences between the equivalents (from the sources)
- AISI D2: Daido (DC11 = JIS SKD11, AISI D2 equivalent) and Proterial (SLD: JIS similar to SKD11, AISI/ASTM D2) list them in the same row. Proterial writes "similar". UNS T30402 was confirmed only at Carpenter (a US steelmaker)
- EN X153CrMoV12: Both Daido and Proterial list 1.2379 in the same row. However, 1.2379 in EN ISO 4957 has V 0.70–1.00, Mo 0.70–1.00 and Si 0.10–0.60, so the ranges for V and Mo differ from SKD11 (V 0.20–0.50, Mo 0.80–1.20)
- GB Cr12MoV: Agrees between Kyocera's comparison table (SKD11 = Cr12MoV = D2) and Baosteel's tool and die steel page (Japanese approximate grade of Cr12MoV: SKD11). Baosteel also gives Cr12Mo1V1 as "US approximate D2 / Japanese approximate SKD11", but Kyocera matches Cr12Mo1V1 with SKD10, so they disagree. The grade name in the new edition GB/T 1299-2025 was not confirmed
⚗Chemical composition (mass %)
As specified in Daido Steel DC11 (equivalent JIS designation SKD11) standards table
| Element | Range | Confidence |
|---|---|---|
| C | 1.4 – 1.6 | One source / reference[2] |
| Si | ≤ 0.4 | One source / reference[2] |
| Mn | ≤ 0.6 | One source / reference[2] |
| P | ≤ 0.03 | One source / reference[2] |
| S | ≤ 0.03 | One source / reference[2] |
| Cu | ≤ 0.25 | One source / reference[2] |
| Ni | ≤ 0.5 | One source / reference[2] |
| Cr | 11 – 13 | One source / reference[2] |
| Mo | 0.8 – 1.2 | One source / reference[2] |
| V | 0.2 – 0.5 | One source / reference[2] |
⚖Density
7.7 g/cm³
One source / reference[7]
Value for EN 1.2379 (X153CrMoV12). The density of SKD11 itself was not found in Japanese manufacturers' materials; it is treated as a reference value for a steel of similar composition
Calculate weight in SKD11 →💪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 |
|---|---|---|---|---|---|
| Annealed (830–880℃, slow cooling) | — | — | — | HBW 255 max | Manufacturer standard value (Daido DC11). EN 1.2379 is also ≤255 HB annealed One source / reference[2][7] |
| Quenched and tempered | — | — | — | HRC 58 min | Reference value (Aichi Steel: HRC 58 or higher can be obtained by quenching and tempering) One source / reference[1] |
| Quenched 1000–1050℃ air cooled + tempered 150–200℃ air cooled | — | — | — | As quenched HRC 62 min / after tempering HRC 61 min (HRC 56–58 when tempered at 500–550℃, shown in parentheses) | Manufacturer standard value (Daido DC11) One source / reference[2] |
| Quenched 1030℃ + tempered 180℃ ×2 / 490–520℃ ×2 | — | — | — | HRC 62 / HRC 59 | Reference value (measurement conditions in Daido's physical properties table) 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 for high-alloy steels, machinability decreases as alloy content and hardness increase, and that in the range of 12–15% alloying elements and hardness up to 450 HB the cutting edge needs heat resistance. After quenching (over 45 HRC) it is treated as ISO H[3]
- Daido DC11 (equivalent to SKD11) is described as having "good machinability: about 20% better than SKD1"[2]
- It hardens on air cooling with little risk of quench cracking, and heat-treatment distortion is small (Daido DC11). Aichi Steel also states that heat-treatment distortion is small and wire EDM performance is good[2][1]
📚Sources
Primary sources (public documents from makers, industry associations and standards bodies), numbered where each value is cited. Many are in Japanese.
- aichi-steel.co.jp https://aichi-steel.co.jp/ENGLISH/products/hagane_company/tool_steel/cold/
- daido.co.jp https://www.daido.co.jp/common/pdf/pages/products/tool/dc11.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
- mmc-carbide.com https://www.mmc-carbide.com/permanent/courses/78/group-h.html
- ucpcdn.thyssenkrupp.com https://ucpcdn.thyssenkrupp.com/_binary/UCPthyssenkruppBAMaterialsSchulte/51eb1416-1b9b-43…
- daido.co.jp https://www.daido.co.jp/en/common/pdf/pages/products/tool/sd2310_cold_en.pdf
- daido.co.jp https://www.daido.co.jp/en/products/tool/cold/index.html
- proterial.com https://www.proterial.com/products/tool_steel/coldforging.html
- carpentertechnology.com https://www.carpentertechnology.com/alloy-finder/D2
- 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/baosteel_bsi/sso_teg/cp_pages_tggmjg.jsp
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