Patent ID: 6358334
Filing Date: 2002-03-19
Classification: B29C,C21D

Abstract:
A manufacturing mold base for plastic injection molds having sufficient dimensional stability that at least two opposing surfaces remain substantially parallel during formation of the base and during the formation of and any subsequent heat treating of a major cavity in the base, the base having suitable ductility and breakout resistance for repeatable formation of one or more apertures in the mold without breakout, which apertures render the base suitable for use as a mold base, and further having suitable corrosion resistance and weldability for use as a mold base, the base being formed from a martensitic stainless steel alloy comprising:about 0.03%-0.06% by weight C; about 1%-01.6% by weight Mn; about 0.01%-0.03% by weight P; about 0.06%-0.3% by weight S; about 0.25%-1% by weight Si; about 12%-14% by weight Cr; about 0.5%-1.3% by weight Cu; about 0.01%-0.1% by weight V; about 0.02%-0.08% by weight N; and the balance being Fe with trace amounts of ordinarily present elements.