α-alloys contain a certain amount of stable α-phase elements, the equilibrium state is mainly composed of α-phase. α-alloys have a small specific gravity, good heat strength, good weldability and excellent corrosion resistance, the disadvantage is the room temperature strength is low, usually used as heat-resistant and corrosion-resistant materials. α-alloys can be divided into full-α-alloys (TA7), near-α-alloys (Ti-8Al-1Mo-1V), and a small number of compounds of the α-alloys ( Ti-2.5Cu), α-alloys (Ti-8Al-2.5Cu). Ti-2.5Cu).
Titanium bar production grades:
National standard grade: TA1, TA2, TA3, TA7, TA9, TA10, TC4, TC4ELI, TC6, TC9, TC10, TC11.
American Standard: GR1, GR2, GR3, GR5, GR7, GR12
Titanium bar production state:
Hot working condition (R)
Cold working condition (Y)
Annealed condition (M)
Solid solution state (ST)
Titanium bar manufacturing process:
Hot forging - hot rolling - turning (grinding)
Titanium bar executive standard:
National standard: GB/T2965-2007, GB/T13810, Q/BS5331-91
American Standard: ASTM B348, ASTM F136, ASTM F67, AMS4928
Titanium alloys can be divided into three categories according to the composition of the phase: α-alloys, (α + β) alloys and β-alloys, which are expressed as TA, TC and TB in China respectively.
① α-alloys contain a certain amount of stable α-phase elements, the equilibrium state is mainly composed of α-phase. α-alloys have a small specific gravity, good heat strength, good weldability and excellent corrosion resistance, the disadvantage of room temperature strength is low, usually used as a heat-resistant materials and corrosion-resistant materials. α-alloys can be divided into full-α-alloys (TA7), near-α-alloys (Ti-8Al-1Mo-1V) and a small number of compounds of the α-alloys (Ti-2.0%) and α-alloys (Ti-2.2%), α-alloys (Ti-2.2%) and α-alloys (Ti-2.2%). (Ti-2.5Cu). ② (α+β) alloys contain a certain amount of elements that stabilise the α- and β-phases, and in equilibrium the alloy is organised in the α- and β-phases. (α+ β) alloy has medium strength, and can be heat-treated to strengthen, but the welding performance is poor. (α + β) alloys are widely used, of which the production of Ti-6Al-4V alloys accounted for more than half of all titanium materials.
③ β alloys contain a large number of stable β-phase elements, high temperature β-phase can be retained to room temperature. β alloys can be divided into heat-treatable β alloys (sub-stable β alloys and nearly sub-stable β alloys) and heat-stable β alloys. Heat-treatable β-alloys have excellent plasticity in the quenched condition and can be aged to a tensile strength of 130-140 kgf/mm2. β-alloys are often used as high-strength, high-toughness materials. Disadvantages are high specific gravity, high cost, poor weldability, and difficult cutting and machining.
