DHA−HS1

DHA-HS1

DHA-HS1 is die steel suitable for hot stamping, in which steel sheets heated to high temperatures are press-formed. Due to its high thermal conductivity, the cooling time of products is reduced, and thus the productivity is increased. Moreover, its high softening resistance extends die life.Therefore, DHA-HS1 helps cut costs of hot-stamped products.

Background

Amid growing environmental concerns, automobile manufactures are rapidly shifting to lightweight auto parts with the aim of improving fuel economy. Under the circumstances, automobile parts are being increasingly produced by hot stamping, using ultra-high tensile strength steel with a tensile strength of over 1 GPa. In response to this growing demand, Daido Steel has developed hot stamping die steel with high thermal conductivity, which can efficiently cool hot steel sheets.

Hot stamping method

In conventional press forming methods, steel sheets are formed at room temperature. However, in the hot stamping method, steel sheets heated to high temperatures are press-formed in dies and are quenched rapidly while being formed, which increases their strength.

Hot stamping method
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Brand name

DHA−HS1
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Features

DHA-HS1 is "Hot stamping die steel", which offers high thermal conductivity as well as excellent abrasion resistance at high temperatures. It contributes to increasing productivity and improving die life.

Features1 High thermal conductivity
Features2 High hardness
Features3 High softening resistance
※Practical hardness
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High thermal conductivityHigh cooling efficiency

With high thermal conductivity of approx.36(W/m·K) at room temperature, DHA-HS1 helps reduce cooling time of dies and steel sheets.

Thermal conductivity

Thermal conductivity Graph image

Dimensions:Φ10 × 2mm

Measurement method:Laser flash method

Quenching:1030℃, Gas cooling (6bar)

Hardness:
DHA-HS1 : 54HRC
H13 eq.   : 50HRC

Test results by an actual hot stamping equipment

Test results by an actual hot stamping equipment Image

[Test method]
The temperature of two types of die steel sheet aligned
together was measured immediately after forming

[Test conditions]

Forming cycle:3.0 spm

Holding time at the bottom dead center:6.0 sec.

Temperature of steel sheet
when forming process started:approx. 850 ℃

Cooling water temperature:approx. 18 ℃

Water line position:approx. 10 mm from the die surface

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High hardnessStable hardenability

Practical hardness of up to 54 HRC is obtained at a wide range of tempering temperatures. Surface treatment also can be applied.

Quenching and tempering hardness

Quenching and tempering hardness Graph image

Dimensions:10×15×20 mm

Quenching:1030 ℃, Gas cooling (6bar)

Cross-sectional hardness distribution

Cross-sectional hardness distribution Graph image

DHA-HS1 model (approx. 130 kg)

Cross-sectional hardness distribution

Quenching:1030 ℃, Gas cooling (6bar)

Tempering:560 ℃ × 1h × 2 times

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High softening resistanceExcellent heat resistance

DHA-HS1 retains high hardness at elevated temperatures when in contact with hot steel sheets. Additionally, die life is increased because of its high heat resistance.

Softening resistance

Softening resistance Graph image

Dimensions:10×15×20 mm

Quenching:1030 ℃, Gas cooling (6bar)

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Contact Us

If you have any questions or requests about DHA-HS1, please contact us using the inquiry form.

Document Disclaimer
The product characteristics included in this website are the representative values based on the result of our measurements, and do not guarantee the performance in use of the products. Please contact our department in charge for the latest information as the information of this website may be updated as needed without advance notice.
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