pressure hardened steel part, pressure hardened laser welded steel part, steel part manufacturing process and part use

摘要

pressure-hardened steel part, in which the chemical composition of the steel comprises by weight: 0,062% = c = 0,095%, 1,4% = mn = 1,9%, 0,2% = si = 0,5% , 0.020% = al = 0.070%, 0.02% = cr = 0.1%, where: 1.5% = (c + mn + si + cr) = 2.7%, 0.040% = nb = 0.060 %, 3.4 xn = ti = 8 xn, where: 0.044% = (nb + ti) = 0.090%, 0.0005 = b = 0.004%, 0.001% = n = 0.009%, 0.0005% = s = 0.003%, 0.001% = p = 0.020%, optionally 0.0001% = ca = 0.003%, where the remainder is unavoidable and impurities and the microstructure comprises mostly surface fractions: less than 40 % bainite, less than 5% austenite and less than 5% ferrite, the remainder being martensite and the aforementioned martensite consists of new martensite and self-tempered martensite.