Micro-alloyed carbon steel as a texture-rolled strip steel, in particular for spring elements

摘要

The invention relates to a cold-rolled carbon steel comprising (in % by weight) C 0.63-0.85%, max. 0.40% Si, 0.20-0.90% Mn, max. 0.035% P, max. 0.035% S, max. 0.060% Al, max. 0.40% Cr, 0.003-0.010% N, preferably 0.005-0.008%, and a maximum of 0.12% of at least one micro-alloying element, the remainder being iron and steel production-related pollutants. Possible micro-alloying elements are Ti, Nb, V and optionally Zr. A carbon steel of the type is cold-rolled into texture-rolled strip steel with a high cold reduction degree and can be used in particular as a material for coiling springs or other components having spring properties.

主权项

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.