Process of production of heat-stable wrought steel components

摘要

In the process of production of strength heat resistance wrought steel components, mainly tubes and sheets at the temperature from 200 °C to 525 °C wrought steel component is produced by the hot rolling from the microalloyed steel which comprises (in weight %): C = 0.02 - 0.30 %; Mn = 0.2 - 2.0 %; Al = to 0.04 %; P = to 0.04 %; S = to 0.04 %; V = to 0.25 %; whereby a total weight amount of Nb + V + Ti is 0.02 to 0.25 % and the content of nitrogen is N = [0.52 x Al + 0.29 x Ti + 0.15 x Nb + (0.014 to 0.137 x V)] %; and Fe and production impurities the remainder, whereby the last heat operation is normalization annealing with the finish-rolling temperature Td, when Td is at interval Ar3 < Td < Ar3 + 50 °C. Advantageously wrought steel component is produced from the microalloyed steel which further comprises (in weight %): Si = to 0.60 %; Cr = to 0.50 %; Ti = to 0.10 %; Ni = to 0.40 %; Cu = to 0.40 % and Nb = to 0.15 %.