The α – alloy contains a certain amount of stable α – phase elements and is mainly composed of α – phase in equilibrium state. Alpha alloy has low specific gravity, good thermal strength, good weldability and excellent corrosion resistance, but it has low strength at room temperature. It is usually used as heat-resistant and corrosion-resistant materials. α – alloys can be divided into total α – alloys (TA7), near α – alloys (ti-8al-1mo-1v) and α – alloys with a small amount of compounds (Ti-2.5Cu).
National standards: TA1, TA2, TA3, TA7, ta9, TA10, TC4, tc4eli, TC6, TC9, TC10, TC11
American Standard: GR1, Gr2, GR3, GR5, GR7, Gr12
Titanium rod production status:
Hot working state (R)
Cold working state (y)
Annealing state (m)
National standards: GB / t2965-2007, GB / t13810, Q / bs5331-91
American Standard: ASTM b348, ASTM F136, ASTM F67, ams4928
1、 Reference standard
1: GB 228 metal tensile test method
2: Grade and chemical composition of titanium and titanium alloys (GB / T 3620.1)
3: GB / t3620.2 chemical composition and allowable deviation of titanium and titanium alloy products
4: GB 4698 method for chemical analysis of sponge titanium, titanium and titanium alloys
2、 Technical requirements
1: The chemical composition of titanium and titanium alloy bars shall comply with GB / T 3620.1, and the allowable deviation of chemical composition shall comply with GB / T 3620.2 when repeated inspection is required.
2: The diameter or side length of hot working bar and its allowable deviation shall comply with the provisions in Table 1.
3: After hot working, the allowable diameter deviation of the bar after turning (grinding), cold rolling and cold drawing shall meet the requirements of Table 2.
4: After hot working, the out of roundness of the polished bar should not be more than half of its dimensional tolerance.
5: The unfixed length of bar in processing state is 300-6000 mm, and that in annealing state is 300-2000 mm. The unfixed length or multiple length should be within the range of unfixed length. The allowable deviation of fixed length is + 20 mm. The multiple length should also be included in the cut size of bar, and each hole size is 5 mm. The fixed length or multiple length should be indicated in the contract.
Medical titanium rod:
Specification: rolling ￠ 8.0 — 40mm × L; forging ￠ 40 — 150mm × L
Microstructure: the grain size of pure titanium is not less than grade 5, and TC4 titanium alloy conforms to a1-a9
Surface: black leather surface, polished surface, polished surface (H11, H9, H8)
Performance of medical titanium rod (refer to GB / t13810-2007, ASTM F67 / F136)