2results about How to "Process parameters are reasonable" patented technology

The invention relates to the technical field of titanium alloy annealing, in particular to an annealing method of a martensite titanium alloy material. The method specifically comprises the following steps that firstly, a martensite titanium alloy material part is fed into a furnace at 800 DEG C, the temperature is increased to 940 + / -10 DEG C, and heat preservation is conducted for 1.5-3 h; 2, cooling to 680 + / -20 DEG C, and keeping the temperature for 2-4 hours; and thirdly, after heat preservation is finished, the part is cooled, and the part is obtained. Compared with the prior art, according to the technical scheme, the technological parameter range is smaller than before, technological parameters are more reasonable, operability is higher, the percent of pass is greatly increased, the percent of pass of one-time inspection is increased to 98% from 50%, and energy consumption and labor cost caused by repeated reworking are reduced.

This invention discloses a 635MPa grade niobium-vanadium-chromium composite reinforced high-performance steel bar and its smelting method. By controlling the chemical composition and V / N mass ratio of the steel bar within the range of 3.35 to 3.75, and employing a multi-element composite strengthening formula of niobium, vanadium, and chromium to replace the traditional single vanadium-nitrogen alloy addition mode, production costs are reduced. During the smelting process, a dedicated dry powder stirring device is used to pre-mix the microalloying reinforcing agent, achieving uniform mixing of powder components and removal of magnetic impurities. Simultaneously, a composite desulfurizing agent is introduced and a step-by-step addition process is adopted, combined with a gradient ladle bottom-blowing argon stirring system, to effectively reduce the sulfur content in the steel. The steel bar prepared by this invention has a uniform microstructure, high grain size, and excellent mechanical properties such as tensile strength, yield strength, strength-to-yield ratio, and elongation. It exhibits good product consistency, low production costs, and can stably mass-produce high-performance 635MPa grade high-strength earthquake-resistant steel bars.