Applications of Vacuum Annealing Furnaces – Titanium Crystallization Annealing Furnaces

2026-11-10 09:07

The annealing furnace for titanium crystallization operates based on a solid-state recrystallization process—distinct from crystallization via melting and solidification. During the cold-forming of pure titanium vessels (such as through stamping or spinning), the internal crystal grains become elongated and distorted, leading to the accumulation of significant residual stress and the phenomenon of work hardening. By heating the workpiece in a vacuum environment to the recrystallization temperature range (580–700°C—well below the 882.5°C β-phase transition temperature of titanium) and maintaining this temperature, new, strain-free, equiaxed grains nucleate within the distorted structure. This process eliminates residual stress from the forming stage, restores the material’s plasticity, and stabilizes the product’s dimensions. Furthermore, the vacuum atmosphere prevents the titanium from absorbing hydrogen, oxygen, or nitrogen at high temperatures, which would otherwise cause discoloration and embrittlement. Typical applications include titanium-based products such as tableware, cookware, vacuum-insulated cups, and heat-dissipation plates for servers.

Pure titanium vessels subjected to recrystallization annealing for stress relief and ductility restoration.

Titanium crystallization annealing requires specific technical parameters regarding vacuum level, temperature, cleanliness, and heating elements within the furnace. Below are the technical specifications for the RVA-446 titanium crystallization annealing furnace from SIMUWU:

Furnace type	Horizontal , single chamber, internal circulation
Loading method	Front loading
Effective working zone	400×400×600 (W×H×L mm)
Max. Loading Capacity	300kg
Power supply	3Phase 400V (±5%) ; 50Hz
Installation power	160kw
Heating power	120kw
Cooling motor power	18.5kw
Max.design temperature	1300℃
Working temperature	500-1250℃
Temperature uniformity	9 point temperature measurement (±5℃) (temperature measurement standard AMS2750E)
Temperature control accuracy	S-type thermocouple ±1℃ (temperature measurement standard AMS2750E)
Quantity of heating zone	3 Independent temperature control zones
Heating element	High-temperature molybdenum
Time to reach working temperature	≤ 75min
Heating rate of empty furnace	0~25 ℃/min(speed adjustable and controllable)
Ultimate vacuum	6.7 x 10-4 pa (Empty furnace, cold state, after sufficient bake-out)
Working vacuum	6.0 x 10-3 pa
Time to pump to working vacuum	≤ 40min (After diffusion pump preheating, empty furnace, cold state)
Pressure rising rate	≤ 0.67 Pa/h (Empty furnace, cold state)
Cooling method	Air cooling/natural cooling
Cooling gas	Nitrogen or argon (purity: 99.99% or 99.999%)
Cooling rate（empty furance 1200℃~150℃）	≤ 45min
Max. Cooling gas inflation pressure	≤ 2bar
Partial pressure	50-1000 Pamanual and automatic partial pressure control
Operation model	Manual or automatic control
Equipment color	Customized