Sheet Metal · 2021年12月28日

What are the requirements for medical titanium bars?

The density of Medical titanium alloy bar with high strength is generally about 4.51g/ cm3, only 60% of steel. The strength of pure titanium is close to that of ordinary steel. 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, which can produce zero and components with high unit strength, good rigidity and light weight. At present, the aircraft engine components, skeleton, skin, fasteners and landing gear are all made of titanium alloy.

Titanium alloy has high thermal strength

The production standard and requirements of GR4 medical titanium bar are that the temperature is several hundred degrees higher than that of aluminum alloy, and the required strength can still be maintained at medium temperature. The two types of titanium alloys can work for a long time at the temperature of 450 ~ 500℃. The specific strength of these two types of titanium alloys is still very high in the range of 150℃ ~ 500℃, while the specific strength of aluminum alloys decreases significantly at 150℃. The working temperature of titanium alloy can reach 500℃, while that of aluminum alloy is below 200℃.

Titanium alloys have good corrosion resistance

The production standard of GR4 medical titanium bar and requirements of titanium alloy work in humid atmosphere and seawater medium, the corrosion resistance of titanium alloy is far better than stainless steel; Especially strong resistance to pitting corrosion, acid corrosion and stress corrosion. To alkali, chloride, chlorine organic goods, nitric acid, sulfuric acid and other excellent corrosion resistance. But titanium has poor corrosion resistance to reducing oxygen and chromium salt media.

Titanium alloy has good low temperature performance

The production standard of GR4 medical titanium bar and the requirement that titanium alloy can maintain its mechanical properties at low and ultra-low temperatures. Titanium alloys with good low temperature performance 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.

GR4 thermal expansion coefficient: GR4 titanium alloy has a series of advantages such as excellent corrosion resistance, small density, high specific strength, good toughness and weldability, etc. It has been successfully applied in aerospace, petrochemical, shipbuilding, automobile, medicine and other departments.

GR4 titanium alloy mechanical properties, tensile strength of sigma b/MPa or greater, 895 of specified residual elongation stress in the sigma r0.2 / MPa or greater 825, 5 (%) of 10 or higher elongation delta, reduction of area bits (%) of 25 or higher

GR4 titanium alloy density: 4.5 (g/cm3) Working temperature: -100 ~ 550 (℃)

GR4 titanium alloy chemical composition: GR4 containing titanium (Ti) allowance, iron (Fe) 0.30, or less carbon (C) 0.10, or less nitrogen (N) 0.05 or less, hydrogen (H), 0.015 or less oxygen (O) of 0.20 or less, aluminum (Al) 5.5 ~ 6.8, vanadium (V) 3.5 ~ 4.5

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