NIPPON KOSHUHA STEEL CO., LTD.

Steel type	Equivalent JIS steel	Hardening and annealing hardness	Features	Application example
KTV	SKT4	35 to 45HRC	General-purpose forging-mold steel	Forging molds, hot- forging molds, extrusion tools
TD3		40 to 50HRC	General-purpose hot-tool steel	Extrusion tools
KDA	SKD61	42 to 52HRC	General-purpose hot-tool steel	Die-cast molds, hot- forging molds, extrusion tools
KDB	SKD62	42 to 52HRC	General-purpose hot-tool steel	Extrusion tools
KDA1		42 to 52HRC	High-tenacity hot-tool steel	Extrusion tools
KDA1S		42 to 52HRC	High-machinability, high-tenacity hot-tool steel	Die-cast molds, hot- forging molds
KDAMAX		42 to 52HRC	Highly functional hot-tool steel	Die-cast molds, hot- forging molds, extrusion tools
KDA5		42 to 52HRC	High-strength hot-tool steel	Die-cast molds, hot- forging molds, extrusion tools
KDF	SKD8	42 to 52HRC	High-strength hot-tool steel	Extrusion tools, hot- forging molds
KDF4		42 to 52HRC	Highest-strength hot-tool steel	Die-casting tools, extrusion tools
UH660	SUH660	30 to 40HRC	Hot-tool steel	Extrusion tools

●Recommended!
	Very clean hot-die steel featuring the higher strength at high temperature and tenacity of the SKD61. Highly reputed for hot extrusion, in particular.

	Brand new with high performance of the KDA1 and improved machinability. Its superior heat-check resistance and aluminum melting- loss resistance attract great attention of the die-casting mold and hot-forging mold industries.

	Higher class steel of the KDA1S. Suitable to large-size and high-performance die-casting molds, hot-forging molds, and aluminum extrusion molds. Ideal for complicated dies subject to large cracks at the mold corners and mold breakage.

●Positions of hot-tool steel characteristics