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Hot Work Tool Steel (Hot-Forming Die)
Daido Steel's tool steels lineup for hot forging and warm forging includes H13, L6, matrix-high-speed steel, and other steel grades with superior high-temperature strength and softening resistance.
Our products contribute to the prevention of wear, heat checking, gross cracking and other issues that may happen in hot forging with high mechanical pressure.
Conceptual diagram
Products list
| Grade | Brand name | Equivalent standard | Characteristics | Detailed information | ||||
| JIS | AISI | WNr. | Special page | Brochure | Technical data | |||
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Type H13 & Modified (5Cr) Single melted |
DHA1 | SKD61 |
H13 eq. |
1.2344 eq. |
・General-purpose hot work die steel |
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| DHA-WORLD |
SKD61 mod. |
H13 mod. |
1.2344 mod. |
・High hardenability & toughness |
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Type 2367 modified (5Cr) Remelted |
DH31-S | - | - |
1.2367 mod. |
・High toughness ・High strength at elevated temp. |
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| DH31-EX | - | - |
1.2367 mod. |
・High hardenability & toughness ・High strength at elevated temp. |
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Type SKD7 (3Cr-3Mo) |
DH71 |
SKD7 mod. |
- | - | ・High softening resistance | |||
| DH32 |
SKD7 mod. |
- | - | ・High strength at elevated temp. | ||||
| Hot-Forging Die Steel | GFA |
SKT4 mod. |
L6 mod. |
1.2714 mod. |
・Especially for hammer forging | |||
| GF78 | - | - | - |
・40HRC Pre-hardened steel ・High strength at elevated temp. |
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High Speed Tool Steel Matrix Type |
DRM1 | - | - | - |
・High toughness ・Maximum hardness 58HRC |
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| DRM2 | - | - | - |
・High hardness & toughness ・Maximum hardness 62HRC |
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For the latest physical property data, please see "Physical Properties“.
Values listed in the brochure may differ.
Hot Work
Tool Steel
Tool Steel
High Speed
Tool Steel
Tool Steel
Technical Data
| No. | Title | Publication / Source | Volume & page | Read the document |
| S01e |
Document with comments "DHA-WORLD" (No. SD2002) |
- | - | Open PDF file |
| S02e |
Document with comments "DH31-EX" (No. SD2001) |
- | - | Open PDF file |
| A01 | 熱間工具鋼の被削性におよぼすSi量の影響 | 大同特殊鋼技報「電気製鋼」 | 2000年 71巻 2号 p.119-129 | Go to J-STAGE site |
| (A01e) |
Effect of Si Content on the Machinability of Hot Working Die Steels (No. SD2005) |
Source: DENKI-SEIKO (Electric Furnace Steel) |
2000, Vol. 71, No. 2, p. 119-129 | Open PDF file |
| A02 | 熱間工具鋼の被削性におよぼすSiおよび硬さの影響 | 大同特殊鋼技報「電気製鋼」 | 2003年 74巻 2号 p.83-92 | Go to J-STAGE site |
| A03 |
高信頼性汎用熱間ダイス鋼 “DHA-WORLD” |
大同特殊鋼技報「電気製鋼」 | 2010年 81巻 1号 p.47-52 | Go to DENKI-SEIKO page |
| A04 | 熱間鍛造金型の摩耗に及ぼす高Si鋼のスケールの影響 | 大同特殊鋼技報「電気製鋼」 | 2014年 85巻 1号 p.5-11 | Go to DENKI-SEIKO page |
| L01 | 高硬度・高靭性マトリックスハイスDRM鋼の開発 | 大同特殊鋼技報「電気製鋼」 | 2005年 76巻 4号 p.279-286 | Go to J-STAGE site |
| (L01e) |
The Development of High Hardness and Toughness Matrix Type High Speed Tool Steels “DRM” (No. SD2108) |
Source: DENKI-SEIKO (Electric Furnace Steel) |
2005, Vol. 76, No. 4, p. 279-286 | Open PDF file |
| L02 | 金型用マトリックスハイスDRM鋼の実用事例 | 大同特殊鋼技報「電気製鋼」 | 2007年 78巻 4号 p.353-360 | Go to J-STAGE site |
