Patent ID: 9103008
Filing Date: 2015-08-11
Classification: B29C,C21D,C22C

Abstract:
1. Steel block or plate having a thickness greater than or equal to 20 mm and less than or equal to 1 m, and a composition-comprising, by weight: 0.03%≦C≦0.15% Si≦0.49% 3.2%≦Mn≦4% Ni≦0.9% 1%≦Cr≦5% Mo+W/2≦1% Cu≦0.9% S+Se/2+Te/3<0.020% Al≦0.1%, the remainder being iron and impurities resulting from production; wherein the steel block or plate has a structure consisting of bainite and martensite, and in that the difference in Brinell hardness between the harder regions and the less hard regions of the steel block or plate, resulting from segregated veins, is less than 20% of the average Brinell hardness of the steel block or plate.