Tool Steel Plastic Mold Steel

Chemical Composition

	C	Si	Mn	P	S	Cr	Ni	Mo	V
Typical analysis	0.28	0.10	1.45	0.015	0.002	1.25	1.05	0.70	0.15

Characteristics
Remelted hardened and tempered plastic mould steel for the most demanding surface fi nish require-
ments. Thruhard Diamond® is based on the successful development of the patented Thruhard Supreme®,

with the following improved characteristics:

• Further refi ned composition of Thruhard Diamond® yielding even higher hardness of approximately 40 HRC
• Microstructure that is both more homogeneous and fi ner
• Extremely high degree of purity
• Mirror-fi nish polishable using up to 3 μm diamond paste (e.g. surface fi nish classes SPI - A1 or ISO 1302-N1).

Laser hardenable or nitridable as supplied; the general high basic hardness of this steel gives it improved
wear resistance and better supporting effect for surface coatings such as hard chrome plating or PVD
coating.

Applications
Injection moulding and compression dies with the most demanding surface fi nish requirements for
producing items such as transparent headlight components, automotive trim and radiator grille panels.
Ideally suited for interior use both for polished surfaces and for extra fi ne-grained surfaces.

Physical properties (reference values)

Thermal expansion coeffi cient (10–6/K)	20–100 °C 10.8	20–250 °C 12.2	20–500 °C 13.9
Thermal conductivity (W/mK)	20 °C 37.4	250 °C 41.3	500 °C 39.8
Young’s modulus (GPa)	20 °C 204	250 °C 188	500 °C 160