Patent ID: 9290832
Filing Date: 2016-03-22
CPC Classification: C21D,C22C,F16F

Claim Text:
1. Cold-rolled carbon steel, having (in wt.-%) C 0.63-0.85%, Si max. 0.40%, Mn 0.20-0.90%, P max. 0.035%, S max. 0.035%, Al max. 0.060%, Cr max. 0.40%, N 0.003-0.010%, niobium Nb as a micro-alloy element and at least one further micro-alloy element selected from the group consisting of Ti, V, and Zr, the niobium Nb and the at least one further micro-alloy element together having a content of at least 0.02% and maximally 0.12%, remainder iron and melt-related contaminants; wherein the carbon steel has a tensile strength in the range of 2400-3000 MPa after cold rolling, wherein the cold-rolled carbon steel is a strip having a thickness of between 0.10 mm and 0.19 mm, and wherein the cold-rolled carbon steel in the strip is a fine-lamellar pearlite structure.