Tool Steel
Tool Steel
Tool Steel

Tool steel is one of Daido's major products and we have a wide variety of products for cold, hot, high speed and plastic mold applications.
Some of our brand steels are highly evaluated globally such as DC53 and NAK. To satidfy our customers' demands, we are pursuing high quality products and high performance technical services.

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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

Brand name

DHA−HS1

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

High thermal conductivity High 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

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

[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

High hardness Stable 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

Dimensions:10×15×20 mm

Quenching:1030 ℃, Gas cooling (6bar)

Cross-sectional hardness distribution

Cross-sectional hardness distribution

DHA-HS1 model (approx. 130 kg)

DHA-HS1 model

Quenching:1030 ℃, Gas cooling (6bar)

Tempering:560 ℃ × 1h × 2 times

High softening resistance Excellent 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

Dimensions:10×15×20 mm

Quenching:1030 ℃, Gas cooling (6bar)

Leaflet and brochure

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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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