Titanium plate hot continuous rolling large-scale manufacturing method

Abstract

The invention discloses a titanium plate hot continuous rolling large-scale manufacturing method. The titanium plate hot continuous rolling large-scale manufacturing method comprises the following steps of: step (1) heating; (2) carrying out rough rolling; step (3) carrying out finish rolling; step (4) crimping; step (5) welding; and step (6) pickling and annealing. According to the titanium platehot continuous rolling large-scale manufacturing method, the temperature required for rolling a titanium plate is ensured by arranging a heat preservation cover on a conveying roller; before an titanium ingot is heated, the edge of the titanium ingot is chamfered, and the chamfering reduces the drum type deformation of the edge of the titanium plate and ensures the shape of a plate formed by rolling the titanium plate.

Description

technical field [0001] The invention belongs to the technical field of hot rolling, in particular to a large-scale preparation method of hot continuous rolling of titanium plates. Background technique [0002] Metal titanium has the advantages of light weight, high strength, corrosion resistance, and high temperature performance. It has important application value and broad application prospects, because it is called "the third metal" and "the metal of the 21st century"; the plate and strip are titanium And the main products of titanium alloy processing materials, accounting for more than 60% of the consumption of titanium processing materials, are mainly used in national defense, aerospace, petrochemical, salt and alkali, metallurgy, ship seaside power stations, medical and sports industries; due to The hot rolling temperature range of titanium and titanium alloy is narrow, the deformation resistance is large, the metal is active at high temperature, and it is easy to oxidi...

AI Technical Summary

Problems solved by technology

[0005] (2) Titanium has a strong affinity with oxygen at high temperatures. In the early stage of heating, a dense oxide film will be formed on the metal surface, which can prevent the further diffusion of oxygen to the substrate; when heated above 500°C, the titanium oxide film will become porous and become Thick and easy to peel off, the oxygen element diffuses continuously to the substrate through the small holes in the film, forming a hard and brittle layer inside the titanium, which reduces its plasticity; when heated above 650°C, titanium reacts strongly with oxygen; when heated above 700°C , and start to react with nitrogen to form a surface getter layer, which will deteriorate the deformation properties of titanium; in addition, when heated in a reducing atmosphere, the hydrogen absorbing effect of titanium is particularly strong, which will cause hydrogen to diffuse into the metal and reduce its plasticity;

[0006] (3) The hot rolling temperature range of titanium is narrow, the metal temperature drop is fast, the deformation resistance during rolling is large, and the work hardening is significant. In addition, if the pass reduction rate during rolling is too large or the rolling speed is too high, not only It is difficult to bite the hot-rolled billet, and it is prone to rolling cracks, poor product surface quality, and bonding between the billet and the roll.

[0007] When the existing titanium plate is rolled, because the titanium plate belongs to high-rolling deformation during billet rolling, the geometric shape coefficient of the deformation zone is very small. The expansion coefficient of the metal is greater than the expansion coefficient in the middle, that is, β 表 >β 中 , because β=b / B (B, b is the width before and after deformation, and β is the expansion coefficient), which affects the forming shape of the titanium plate, thus affecting the forming quality of the titanium plate

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