The chemical, physical and mechanical properties of titanium screws

1, the density of titanium is 4.51g/cm3, higher than aluminum and lower than steel, copper, nickel, but the ratio strength is located at the top of the metal. The melting point of titanium is 1660 ± 10 degrees C. The boiling point is 3287 degrees C. The combined price is 2, 3 and 4. Good corrosion resistance, not affected by the atmosphere and sea water. At room temperature, it will not be corroded by dilute hydrochloric acid, dilute sulfuric acid, nitric acid or dilute solution;
2, titanium dust is explosive, in case of heat, open fire or chemical reaction will burn and explode. Its powder chemical activity is very high, in the air can self-ignite. Titanium burns not only in the air, but also in carbon dioxide or nitrogen. At high temperature, it is easy to combine with halogen, oxygen, sulfur and nitride. When titanium is burned, dry powder and dry sand are used to extinguish the fire. Water, foam and carbon dioxide rescue are strictly prohibited. When it is hot or burning violently, a water rescue may cause an explosion.
3, titanium is very lively, not only in the dissolved state, even in the solid phase state above 400 degrees C, but also very easy to be water, air, grease and oxides and other pollution, absorption of oxygen, nitrogen, hydrogen, carbon, so that welding joint plasticity and toughness decreased, and cause pores, cracks. The harm caused by iron pollution to titanium is mainly caused by the phase of forming brittle titanium iron compounds during welding and heating, which causes the weld's hydraulic performance and corrosion resistance to decrease, and the surface iron particles cause pitting, and hydrogen brittleness under the action of the corrosion medium.
4, titanium line expansion coefficient of about 2/3 of carbon steel, equivalent to 50% of stainless steel.
Titanium has a thermal conductivity 4.5 times smaller than carbon steel and lower than stainless steel.
5, titanium has obvious elasticity, its resilience is 2 to 3 times the cold molding of stainless steel. As easy to adhesion as stainless steel. The pull strength of titanium decreases as the temperature increases. When the temperature reaches 250 degrees, its tensile strength is only 50% of room temperature.
6, industrial pure titanium plasticity and temperature has a special relationship, room temperature to 200. C, the relative elongation of titanium increases, and then continues to heat up and begins to decline. at
At 450 to 500, the relative elongation reached the minimum value and then increased significantly.
Therefore, the operating temperature does not exceed 350. C。

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