(1) The elastic modulus of titanium is relatively low r […]
(1) The elastic modulus of titanium is relatively low relative to its tensile performance. Therefore, in the pressing and roller operations, a larger rebound margin must be considered. It is precisely because of the lower modulus of elasticity that in order to achieve the same degree of stability, the cross section of titanium parts is slightly larger than that of the same steel parts.
(2) Titanium is easy to machine, but considering its seizure tendency (larger than stainless steel) and low thermal conductivity, it is necessary to appropriately improve the commonly used machining technology and the design of the thread and bearing surface. At least a rigid machine tool, sharp cutting tools, slow speed, large cutting volume, and leave room for chip removal, it is also recommended to use a large amount of cooling lubricant.
(3) The coefficient of thermal expansion of titanium is 75% of that of carbon steel. When it is necessary to combine these two materials in equipment design and manufacturing, special attention should be paid to this point.
(4) Because titanium is a kind of active metal, it is easy to combine with oxygen in the air when heated above 600℃, so it is generally not recommended to use titanium for a long time at a temperature higher than this temperature.
(5) When the temperature of industrial pure titanium exceeds 150~200℃, the mechanical strength decreases rapidly.
(6) The diffusion rate of hydrogen in titanium is faster than that of oxygen. Therefore, before the thermal processing, the heating furnace used should have a micro-oxidizing atmosphere. This will produce a thinner oxide film, but it avoids the possibility of hydrogen. Deep pollution.
(7) The softer industrial pure titanium plate is easy to be cold-formed after annealing; the harder industrial pure titanium and Ti2.5Cu require medium temperature processing, and the processing temperature for Ti6Al4V is preferably 600~700℃.
(8) Composite plates can be obtained by explosive welding of thin titanium plates and thick steel plates, which can be used to manufacture high-pressure and high-temperature vessels and heat exchangers. However, it is not economically cost-effective to use it to replace the overall titanium or the titanium-lined plate of the suit.