Hot work tool steel

Due to its excellent toughness and resistance to softening under high temperatures, this steel is used in hot work/warm work forging, die casting, and more recently, in hot stamping molds.

Hot work tool steel characteristics

1. Positioning of characteristics
SKD61 AUD72 AUD91 AUD61
2. Chemical composition/characteristics

AUD61 High toughness general purpose hot work tool steel (SKD61 high performance type)

Supported standards
Aichi Brand Steel SKD61rev
Type of steel
AUD61

Features

AUD61 is a high toughness hot work tool steel with improved toughness, heat strength, and hardenability compared to SKD61.

Optimal for improving life of dies with problems of cracking, chipping and heat checks.

(1) Favorable toughness (2) favorable heat check resistance (3) favorable hardenability

Major applications

Hot work forging press dies, hot work extrusion dies, casting dies, cutting blades

AUD72 High strength general purpose hot work tool steel (a higher level of wear resistance than SKD61)

Supported standards
Aichi Brand Steel SKD7rev
Type of steel
AUD72

Features

AUD72 is a high strength hot work tool steel with improved toughness, hot temperature strength and hardenability over SKD7.

Using in place of SKD61, optimal for improving life of dies with problems of heat checks and wear.

(1) Favorable resistance to softening at high temperatures (2) favorable heat strength and resistance to wear

Major applications

Hot work forging press dies (rapid hot work forging die, hot work closed forging die, hot work extrusion die) casting dies, etc.

AUD91 Precipitation hardened hot work tool steel (prehardened steel)

Supported standards
Aichi Brand Steel precipitation hardened hot work tool steel
Type of steel
AUD91

Features

AUD91 is a prehardened steel tempered before secondary hardening in advance.

During forging process, the forged material heat is utilized for precipitation hardening of the die surface to improve wear resistance.

(1) Favorable wear resistance (2) favorable hot work strength

Major applications

Hot work forging press dies (upsetter die, hot work extrusion die)

SKD61 General purpose hot work tool steel (standard type of steel)

Supported standards
JIS SKD61 equivalent
Type of steel
SKD61

Features

SKD61 is a type of steel with high toughness preventing cracking or chipping due to the consistent fine annealed microstructure.

(1) Favorable toughness

Major applications

Hot work forging press dies, hot work extrusion dies, casting dies, etc.

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