Vacuum Annealing Process of Cold Rolled Industrial Pure Titanium Coil

Abstract

The present invention discloses a vacuum annealing technology of cold rolled commercial pure titanium coils, the technology comprising the following steps: putting 3 cold rolled commercial pure titanium coils of which the surface has been cleaned into a vacuum annealing furnace, and pre-vacuumizing the vacuum furnace until the vacuum degree is not higher than 2.0*10-3Pa; heating the furnace at a heating rate of 40~90 DEG C / h until the temperature of the furnace reaches 450~500 DEG C, and maintaining this temperature for 3~6 hours; keeping heating the furnace at a heating rate of 50~100 DEG C / h until the temperature of the furnace reaches 600~680 DEG C, adding inert gas of which the purity is not less than 99.99% into the furnace until the pressure reaches 2.0~8.0 kPa, and maintaining this temperature for 4~8 hours; closing the heating system, cooling the furnace at a cooling rate of 50~100 DEG C / h until the temperature of the furnace drops to 330~370 DEG C, starting a forced cooling system, and taking out the titanium coils when the temperature of the furnace is not higher than 150 DEG C. The smooth finish of annealed titanium coils is even. Through test, it is found that both the inner and external coils are of homogeneous structure, and the mechanical property is good, so that the requirements are fully met.

Description

technical field

[0001] The invention relates to a heat treatment process for pure titanium, in particular to a vacuum annealing process for pure titanium coils. Background technique

[0002] Industrial pure titanium has different recrystallization temperatures in the range of 450-550°C depending on the impurity components and cold deformation rate. The annealing temperature of titanium coils should be higher than the recrystallization temperature to ensure the recrystallization of titanium coils. Completely, wherein, the annealing temperature refers to the temperature that should be heated to reach during annealing. The chemical properties of titanium are active, and it is easy to react with O, H, N and other elements in the air at high temperature to form an oxide layer, which deteriorates the physical and chemical properties, not only increases the hardness and brittleness, but also reduces the plasticity and elasticity. The adsorption of pure titanium is also strong. The...