Clad titanium plate refers to the composite plates made by cladding titanium plate and base steel plate through the explosion and rolling process. The base metal usually uses some cheaper material such as carbon steel or low alloy steel plate and the cladding layer usually using the stainless steel plate and other alloy steel with higher performance such as titanium for cladding material, sometimes one layer and sometimes double layers are available. The titanium cladding plate is characterized by its excellent bonding characteristics such as stable performance, wider and longer size and more economical performance. The cladding has a wide of industrial fields including chemical process, marine, power generation and so on.
The commonly used methods for titanium clad plate including: metal ingot rolling, explosion bonding, rolling compression, overlaying and other effective cladding technology. Recently a company from Nanjing, China develop and implement a kind of double layer cladding titanium plate methods, which manufactured by controlling the length of furnace burner flame to prevent the long fire exposure to the titanium plate and burning it, so as to prevent the two metals in combination with surface intermetallic compound is generated, is conducive to the shape of a control panel, in the process of rolling in the subsequent and reduce titanium layer thinning. This method has many advantages such as good shape, uniform size and excellent performance. The details of the process including:
(1) Choosing flawless clad plate and steel base plate.
For the two-sided cladding titanium plate, clad layers are titanium plate and the base layer is steel. The base plate and one of titanium sheet are combined with explosive cladding by vacuum technology, and then another titanium clad is combined by the secondary explosion to form double sides of the titanium-steel composite cladding. By the way, the base steel is ordinarily plain carbon and alloy steel.
(2) Cladding surface treatment.
The titanium cladding is treated on the surface to remove impurities on the upper and lower surfaces and burrs around them.
(3) Heating in the walking beam furnace and controlling the flame length of the burner.
Heat the cleared cladding sheet in the walking beam reheating furnace and preheating, heating and soaking in turn. Preheat temperature should be less than 550 ℃ and preheating time are more than 50 min; Heating temperature is 750 ~ 750 ℃, heating speed is 300 ℃ or less/h; Soaking zone temperature is 830 ~ 920 ℃, the soaking time is 60 ~ 150 min;screw-down rate
(4) Mill descaling and multiple rolling.
The soaking cladding was sent to the mill for descaling and rolled in 5~13 times. The first reduction rate of the rolling was controlled by > 20%, the next reduction rate was less than 10%, and the total reduction rate was 60%~90%. After the rolling, the cladding titanium plate was air-cooled.
(5) Air cooling and straightening.
The cladding plate is straightened after air cooling, and then straightened. Placed them in the straightening machine and determined the straightening order according to the thickness of the cladding sheet. And set the parameters of edge roller at the outlet of the straightening machine, so that the Ti-cladding plate to be straightened through the straightening machine uniformly; Straightening temperature should be greater than 600 ℃ or higher and straightening times at least 1 times