Products Description
I. Product Advantages
1. Elongation ≥25% (annealed state), enabling secondary processing such as bending, stamping, and welding to form complex components (e.g., titanium plate fins for chemical heat exchangers).
2. Superior low-temperature performance: Maintains excellent toughness in liquid hydrogen environments down to -253°C without low-temperature embrittlement, suitable for cryogenic pressure vessel manufacturing.
3. Non-magnetic: Suitable for magnetically sensitive components in military and electronic equipment, preventing interference with instrument precision.
4. High-temperature oxidation resistance: Exhibits extremely low oxidation rates in atmospheric environments below 500°C and can withstand short-term exposure to 600°C, making it suitable for medium-to-low temperature heat-resistant components.
II. Key Points for Pure Titanium Plate Rolling
1. Heating Process: Oxidation Prevention + Phase Control Zone (Core Prerequisite)
Heating Temperature: For hot-rolled GR1/GR2, recommended heating temperature is 780–820°C. For TA3 with slightly higher strength, temperature may be increased to 800–850°C.
Cold Rolling: Roll at room temperature (no heating required). However, thick plates require intermediate annealing (600–700°C, hold for 1–2 hours) to relieve work hardening before cold rolling.
Atmosphere Protection: Heating must be performed in vacuum furnaces or argon-shielded furnaces to prevent air exposure. Holding Time: Adjust based on plate thickness (20–50 mm plates require 2–4 hours holding time) to ensure uniform temperature distribution and prevent localized overheating or insufficient heating.
2. Rolling Process Control: Speed + Equipment (Determines Sheet Properties)
Rolling Speed:
Hot Rolling: Low-speed rolling (0.5–1.5 m/s) to prevent localized overheating (exceeding the β phase region) caused by friction heat, which leads to coarse grain formation.
Cold rolling: Medium-speed rolling (1–2 m/s) to reduce work hardening rates and prevent edge cracking in the sheet.
Equipment Requirements: Rolls must use wear-resistant alloys (e.g., Cr12MoV) with polished surfaces (surface roughness Ra ≤ 0.8 μm) to prevent scratching the titanium plate surface. Specialized cooling lubricants (e.g., extreme pressure oils containing molybdenum or tungsten) must be sprayed during rolling to reduce friction coefficients while simultaneously cooling the rolls and plates.
3. Cooling and Subsequent Processing: Ensuring Dimensional Accuracy + Performance Stability
Cooling Methods:
After hot rolling: Air cooling or forced air cooling (avoid water cooling to prevent deformation or cracking due to excessive temperature differences). Control cooling rate at 5–10°C/min to ensure uniform microstructure (fine, uniform α phase).
After cold rolling: Natural cooling to avoid internal stresses caused by rapid cooling.
Post-Processing:
Pickling: Remove surface scale, ensuring no scale residue remains (surface appears silvery white after pickling).
Annealing: Cold-rolled products require finished annealing (600–650°C, vacuum holding for 2 hours) to eliminate internal stresses and restore ductility (post-annealing tensile strength ≥370 MPa, elongation ≥25%).
Straightening: Employ a roller straightening machine (accuracy ±0.5 mm/m) to correct sheet flatness (flatness ≤3 mm/m) and prevent warping.
III. Summary of Key Application Scenarios Comparison
Corrosion Resistance Priority: Chemical processing, offshore engineering → Select hot-rolled sheet (thick specifications, low cost, meets corrosion resistance requirements);
Precision and Surface Quality Priority: Aerospace, medical devices, electronics → Select cold-rolled sheet (thin specifications, high precision, smooth surface);
Special Functional Requirements: Anti-slip → Patterned cold-rolled sheet; Biocompatibility → Polished cold-rolled sheet; Low-Temperature Environments → Hot-rolled / Cold-rolled sheet (pure titanium exhibits excellent low-temperature toughness without requiring special treatment).
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