WEDGE TOP-TYPE ULTRA-LOW TEMPERATURE BALL VALVE AND PREPARATION METHOD THEREFOR

摘要

Disclosed are a wedge top-type ultra-low temperature ball valve and a preparation method therefor. The ball valve is mainly prepared by the following steps: determining the chemical element composition of stainless steel, smelting, sampling and analyzing, deoxidation slagging, refining, pouring, tapping into a ladle , arc-striking, natural cooling, preheating, forming an ingot, hot rolling, cold rolling, ultrasonic treating, annealing, water quenching, two-stage aging, evenly applying mixed powders C and V to the surface of the stainless steel sheet, laser treating, soaking, drying and welding assembly. The wedge top-type ultra-low temperature ball valve obtained by this method has a very good low temperature resistance.