Titanium and titanium alloys have the advantages of low density, high specific strength, non-magnetic properties, corrosion resistance, and biological affinity. It is widely used in aerospace, energy and chemical industry, weapons and equipment, medical and civil fields application. The mainstream material of plate heat exchanger plates is stainless steel (SUS304, 316). Due to the excellent corrosion resistance of titanium materials, stainless steel plates have been gradually replaced by titanium materials in heat exchange equipment for fluids such as seawater, brine, and salt. The production of titanium plates for plate heat exchangers requires strict control of the following key processes.
(1) Raw materials are the first link to be controlled. Low iron and low oxygen raw materials must be selected in the selection of titanium sponge, and the Brinell hardness HBW is less than 90.If the sponge titanium selected in the current period cannot reach the required smelting amount, the sponge titanium selected should be properly preserved to prevent moisture.
(2) The slab melting process must be carried out in strict accordance with the requirements of the melting process notice. The slab after smelting should ensure the effective removal of oxide layer during the milling process. Try to use milling instead of repair to ensure the surface quality of subsequent production.
(3) The production is carried out according to the set process route. The process system of second shot blasting and second pickling before the first rolling pass of cold rolling is an effective guarantee for the surface quality of cold rolled products.
(4) The annealing temperature of the finished product annealing temperature is increased to 655-665 ℃ for 30 minutes, which can effectively control the grain size in the 6-7 level range. At this time, the cupping performance is better, and the mechanical properties are also Meet the requirements of titanium plates for plate heat exchangers.