Original Title: Supply of American GR3 High Temperature Resistant Titanium Alloy Imported GR3 Titanium Plate High Toughness GR3 Titanium Alloy Plate Titanium is a new type of metal. The properties of titanium are related to the content of impurities such as carbon, nitrogen, hydrogen and oxygen. The impurity content of the purest titanium iodide is not more than 0.1%, but its strength is low and its plasticity is high. The properties of 99. 5% CP titanium are as follows: density ρ = 4. 5g/cm3, melting point 1800 ℃, thermal conductivity λ = 15. 24w/ (m. K), tensile strength σb = 539mpa, elongation δ = 25%, reduction of area ψ = 25%, elastic modulus e = 1. 078 × 105mpa, hardness hb195. (1) The density of titanium alloys with high specific strength is generally about 4.5g/cm3,
titanium filler rod, which is only 60% of that of steel. The strength of pure titanium is close to that of ordinary steel, and some high-strength titanium alloys exceed the strength of many alloy structural steels. Therefore, the specific strength (strength/density) of titanium alloy is much higher than that of other metal structural materials, as shown in Table 7-1, and the parts and components with high unit strength,
titanium seamless tube, good rigidity and light weight can be manufactured. At present, titanium alloys are used in engine components, skeletons, skins, fasteners and landing gears of aircraft. (2) High thermal strength. The service temperature is several hundred degrees higher than that of aluminum alloy. It can still maintain the required strength at medium temperature and can work for a long time at 450 ~ 500 ℃. These two kinds of titanium alloys still have high specific strength in the range of 150 ~ 500 ℃, while the specific strength of aluminum alloy decreases significantly at 150 ℃. The working temperature of titanium alloy can reach 500 ℃, while that of aluminum alloy is below 200 ℃. (3) Good corrosion resistance The corrosion resistance of titanium alloy is far superior to that of stainless steel when it works in humid atmosphere and seawater medium. It has strong resistance to pitting corrosion, acid corrosion and stress corrosion. It has excellent corrosion resistance to alkali,
titanium plate gr7 ,
nickel titanium wire, chloride, chlorine organic substances, nitric acid, sulfuric acid and so on. But titanium has poor corrosion resistance to media with reduce oxygen and chromium salts. And (4) that titanium alloy with good low-temperature performance can still maintain the mechanical property at low temperature and ultralow temperature. Titanium alloys with good low-temperature properties and very low interstitial elements, such as ta7, can maintain a certain degree of plasticity at -253 ℃. Therefore, titanium alloy is also an important low temperature structural material. (5) high chemical activity titanium has high chemical activity and produces strong chemical reactions with o, n, H, Co, CO2, water vapor, ammonia and the like in the atmosphere. When the carbon content is more than 0. 2%, a hard tic will be formed in the titanium alloy; when the temperature is higher, a hard tin surface layer will also be formed; when the temperature is above 600 ℃, titanium absorbs oxygen to form a hard layer with high hardness; when the hydrogen content increases, an embrittlement layer will also be formed. The depth of the hard and brittle surface layer produced by gas absorption can reach 0.1 to 0.15 mm, and the degree of hardening is 20% to 30%. The chemical affinity of titanium is also large, and it is easy to adhere to the friction surface. (6) Low thermal conductivity and low elastic modulus The thermal conductivity of titanium is 15.24 w/ (m. K), which is about 1/4 of that of nickel, 1/5 of that of iron and 1/14 of that of aluminum, while the thermal conductivity of various titanium alloys is about 50% lower than that of titanium. The elastic modulus of titanium alloy is about 1/2 of that of steel, so its rigidity is poor and it is easy to deform, so it is not suitable for making slender rods and thin-walled parts. When cutting, the springback of the machined surface is very large, which is about 2 to 3 times that of stainless steel, resulting in severe friction, adhesion and adhesive wear of the tool flank.
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