Used in the production of plates, strips, foils and bars. The bloom temperature of the billet provided by rolling smelting-extrusion is generally between 1200 and 1250°C; the bloom temperature of the billet provided by powder metallurgy is generally about 1400°C. In order to reduce uneven deformation, the pass deformation during blooming should be between 20-40%, and the total deformation after each heating is about 75%. When the total deformation exceeds 85% (the thickness of the plate is about 6 mm), the rolling temperature can be reduced to 700-900°C; when the plate thickness is 1 to 2 mm, the rolling temperature can be reduced to 200-400°C. Depending on the plasticity-brittleness transition temperature of the material, the thickness of the plate that transitions to cold rolling is 0.5 to 1 mm. Cross rolling can be used to improve the anisotropy of the product. In order to obtain sufficient work hardening and improve low-temperature plasticity, the appropriate cold working amount of the final product should be about 70%.
Pipe processing Molybdenum pipes are mainly made of cast ingots or sintered ingots as extruded pipe blanks. Various pipes are made by rolling, drawing or spinning using warm processing technology. China uses warm rolling to produce small-diameter molybdenum tubes. The initial rolling temperature is generally about 650°C, and the final rolling temperature is about 350°C. The processing rate of warm rolling passes is generally between 20-35%, and the maximum can reach more than 40%. For a molybdenum tube with a diameter of 8 mm and a wall thickness of 0.5 mm, the rolled tube can be as long as 6500 mm. The warm-rolled molybdenum tube has good inner and outer surfaces, good plasticity at room temperature, and can be further drawn into capillary tubes. Thin-walled tubes with larger diameters are generally formed by extruded or sintered tube blanks and then processed by spinning.