NIPPON KOSHUHA STEEL CO., LTD.

The KDA1 is a general-purpose hot-tool steel with a higher strength at high temperature and tenacity than the general-purpose hot-tool steel KDS (equivalent to SKD61).

Features of KDA1

1.Superior heat-check resistance
●Hard to crack in comparison with the SKD61, and has a finer structure.　●Has superior heat-check resistance equivalent to the KDA1S and offers longer service life.
2.Superior tenacity　●80% or more higher tenacity than the SKD61 (in the T direction).　●Good tenacity equivalent to the KDA1S.
3.Superior heat-softening resistance　●Twice as high heat-softening resistance as the SKD61 maintains high hardness for a long time.

Applications	Position of KDA1	Heat-check resistance

●Tools for hot projection ●Hot forging dies

Thermal processing characteristics

Melting-loss resistance		Heat-softening resistance

The KDA1 features superior melting-loss resistance to the SKD61, which is remarkably improved by surface treatment.		The KDA1 features superior heat-softening resistance to the SKD61.

Strength and tenacity

The KDA1 features superior tenacity to the SKD61.

Physical properties

The KDA1 has smaller thermal expansion than the SKD61. Lower thermal conductivity than the SKD61 yields less temperature gradient.