Cold mannered null cold in order to produce the billet which is disconnected to the band steel or the band-like of the marageing steel which is rolled

摘要

A method for manufacturing a steel slab to be cut and cured by hardening heat treatment and the cold rolling, the strip or strip of maraging steel, before the hardening heat treatment, the steel slab or steel strip and according to which Between recrystallization annealing the steel strip or band steel and imposed on cold plastic deformation in the cold working rate of more than 30%, I will so as to obtain a crystal grains fine ASTM index of more than 8. The chemical composition of the maraging steel, by weight: 12% ≦ Ni ≦ 24.5%; 2.5% ≦ M ≦ 12%; 4.17% ≦ Co ≦ 20%; Al% ≦ 0.15%; Ti ≦ 0.1%; N ≦ 0.0003%; Si ≦ 0.1%; Mn ≦ 0.1%; C ≦ 0.0005%; S ≦ 0.001%; ​​P ≦ 0.005%; H ≦ 0.0003%; includes 0.001% O ≦, the rest is an impurity derived from the smelting and iron, Furthermore, the chemical composition relationship further: 20% ≦ Ni + Mo ≦ 27%; 50 ≦ Co × Mo ≦ 200 ; I meet the; 2 × ^{10 -4} Ti × N ≦. Billet or steel strip obtained.