Manufacturing Method of Low-Cost High-Strength Toughness Ultra-thin 9Ni Steel Sheet

摘要

More particularly, the present invention relates to a method of manufacturing a low-cost, high-strength, ultra-thin 9Ni steel sheet, which comprises the steps of: C: 0.03-0.06%; Si: 0.1-0.2%; Mn: 0.5-0.8% 0.005%, N 0.007%, N 0.007%, a vacuum of less than or equal to 50 Pa, an excess Fe, Smelting with a melting furnace to produce an alloy; The heating temperature and the keeping time are 1160-1220 ° C and 90-180min, respectively, and the thickness of the semi-finished product after crushing is 120-150 mm; The rolling is controlled in two steps, rolled, delayed for 10-15 s, accelerated cooled at a cooling rate of 15-40 ° C / s until cooled to 440-550 ° C, and then air cooled to room temperature; Wherein the steel sheet is heated to 575 - 605 캜, tempered for 45 - 70 min, and then cooled to room temperature, wherein the ultra thin 9Ni steel sheet is manufactured at low cost. Based on 9Ni steel material characteristics and ultra-thin steel plate cooling characteristics, the method combines rolling control and cooling control with the heat treatment method to improve the performance of the material, shorten the work process and reduce the energy consumption of the process, Of production costs.