Daido's manufacturing technology is opening new door to next-generation material standard
Daido Steel's high-reliable conventional hot work die steel, DHA-WORLD is suitable material for die cast molds.
It is easily heat-treated and able to gain fine structure to the center as well as high toughness.
Examples of Applications
Automotive Trasmission Cases
Automotive Cylinder Blocks
Motorcycle Cylinder Blocks
Physical heat treatment test
 Test Condition
Evaluating internal quality using the mold simulating center cores of transmission case
- Model mold size: 481×415×526mm (370kg)
- Test method: High performance heat treatment (e-HIT etc.)
- Comparison of DHA-WORLD and JIS SKD61 (AISI H13, DIN 1.2344)
- Internal temperatures were measured
- Hardness: 43HRC
 Charpy impact values of mold center
- Cooling rate at the mold center (400 - 200℃): Approx. 3℃/min
- Hardness: 43HRC
- Charpy specimen: 2mmU notched, H direction
- Numbers in black: actual values (Unit: J/cm2)
As center impact value drops are rather small, DHA-WORLD secures high toughness
 Microstructures of mold center
When the cooling rate during quenching is small, coarse bainitic laths as shown in the picture where the red arrows are pointing tend to generate, which leads to decrease in impact values.
DHA-WORLD has excellent hardenability so even under the cooling rate where those structures generate for SKD61, it secures fine microstructures and high impact toughness.
DHA-WORLD has fine microstructures to the mold center because of its excellent hardenability
DHA is a registered trademark or trademark of Daido Steel Co., Ltd.
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DHA-HS1 provides the highest level of thermal conductivity, which allows shorter cooling time and greater productivity. In addition, its high softening resistance prolongs die life. DHA-HS1, which is ideal for hot stamping dies, can create cost savings in press processing.
World class stable and reliable quality steel, NAK80, has been selected as the most suitable steel for plastic molds.