1、 Core material performance
1. High voltage resistance capability
Pressure range: The working pressure of industrial pure titanium TA2 elbow is ≤ 10MPa, and titanium alloy can reach 30MPa through wall thickness optimization, significantly higher than the demand of conventional pipelines.
High temperature adaptability: TA2 has a long-term temperature resistance of ≤ 300 ℃, while TC4 titanium alloy can be increased to 450 ℃, maintaining high strength at high temperatures.
Mechanical support: TA2 tensile strength ≥ 345MPa, TC4 can reach above 895MPa, high yield strength ensures that the structure does not deform under high pressure.
2. Anti fatigue characteristics
Cycle life: The fatigue limit of TA2 elbow under alternating stress is about 600MPa, with a lifespan of>10 ^ 7 cycles, suitable for vibration environments.
Anti crack propagation: After high-pressure heat treatment, the fatigue strength of TC4 is increased by 80%, and the crack propagation rate is reduced to the level of 10 ⁻⁶ mm/cycle.
Lightweight vibration reduction: With a density of only 4.5g/cm ³, it reduces inertial loads and delays the initiation of fatigue cracks.
2、 Key manufacturing processes enhance performance
1. Optimization of Cold Push Bending Forming
Heat treatment process: Adopting 1120 ℃× 30min+850 ℃× 30min step treatment to eliminate grain boundary segregation, increase elongation to 66%, and avoid cold bending cracking.
Bending speed control: Low speed bending reduces stress concentration and ensures uniform wall thickness of the bend.
2. Surface and welding strengthening
Inner wall treatment: Electrolytic polishing reduces roughness Ra ≤ 1.6 μ m, reduces turbulence impact damage, and extends fatigue life.
Welding technology: High precision argon arc welding combined with TC4 titanium alloy, weld strength coefficient ≥ 0.9, no leakage risk.
3、 High demand scenario application cases
1. Chemical high-pressure system
In the chlor alkali industry, TA2 elbows can withstand 20% wet chlorine gas and have a lifespan of over 10 years, replacing nickel based alloys to reduce costs by 40%.
2. Aerospace hydraulic piping
TC4 elbow is used in aircraft fuel systems to meet the requirement of>10 ⁹ cycles under a fluctuating pressure of 30MPa, reducing weight by 30%.
3. Deep sea equipment connectors
Ti31 titanium alloy elbow is used for 6000 meter deep sea valves, resistant to seawater corrosion and high pressure fatigue.
