Patent ID: 8557059
Filing Date: 2013-10-15
Classification: B29C,C21D,C22C

Abstract:
1. A mold plate for plastic injection having a highly polished mold surface shaped for articles including frames or panels of electronic display screens, the mold plate being formed from a molybdenum-free low carbon martensitic stainless steel alloy comprising in weight %: about 0.05 to 0.07% C; about 1.15 to 1.45% Mn; about 0 to 0.025% P; about 0 to 0.008% S; about 0.45 to 0.6% Si; about 12.15 to 12.65% Cr; about 0 to 0.5% Ni; about 0.45 to 0.65% Cu; about 0.02 to 0.08% V; about 0.04 to 0.08% N; the balance being Fe with trace amounts of impurities and the alloy has a Rockwell C hardness (HRC) within the range of 38 to 42 HRC.