Titanium rod storage environment requirements

Titanium alloy materials for titanium alloy screws are closely related to the manufacturing process and uses of titanium alloy screws. On the one hand, the manufacturing process of titanium alloy screws mainly includes three parts: first, plastic deformation, such as upsetting, reducing and thread rolling, etc.; second, surface strengthening, such as strengthening the bolt bearing surface and the transition zone of the straight rod; finally, Mechanical processing, such as turning, milling and grinding. On the other hand, the purpose of titanium alloy screws is different, and the performance requirements of the required materials are also different, which requires the use of different titanium alloy materials. Taking rivets and bolts as examples, rivets need to be upset at one or both ends during the installation process, so the riveting process requires higher plasticity of the material. Bolts generally require high strength, and their strength level is close to that of 30CrMnSiA high-strength alloy steel, so high-strength titanium alloy materials are usually used. Based on the above two factors, the titanium alloy materials used for titanium alloy screws are also mainly divided into three types: industrial pure titanium, (α+β) type and β type titanium alloy, see Table 2 for details. It can be seen from Table 2 that the industrial pure titanium is mainly TA1 and TA2. (α+β) titanium alloys mainly include TC4, TC6, and Ti-662. β-type titanium alloys are mainly meta-stable β-type titanium alloys because the molybdenum equivalent of meta-stable β-type titanium alloys is generally about 10%. The near-beta titanium alloy with a molybdenum equivalent of less than 10% has insufficient heat treatment strengthening effect; the stable beta-type titanium alloy with a molybdenum equivalent greater than 10% will have high β-phase stability during the aging heat treatment process, and it is difficult to decompose, so meta-stable β-type titanium The strengthening effect of alloy materials is the most obvious. In addition, the metastable β-type titanium alloy has excellent cold formability and can be cold-headed, avoiding the use of professional heating equipment and gas protection media, high production efficiency, and material utilization, and the formed titanium alloy screw has high dimensional accuracy and surface Good quality. The (α+β) type titanium alloy titanium alloy screw can only be formed by hot upsetting, which requires special heating equipment and gas medium, low production efficiency and material utilization, and it is also prone to uneven heating temperature.
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