α alloy contains a certain amount of elements that stabilize the α phase, and is mainly composed of α phase in equilibrium. α alloy has a small specific gravity, good thermal strength, good weldability and excellent corrosion resistance. The disadvantage is low room temperature strength and is usually used as heat-resistant and corrosion-resistant materials. Alpha alloys can usually be divided into full alpha alloys (TA7), near alpha alloys (Ti-8Al-1Mo-1V) and alpha alloys with a small amount of compounds (Ti-2.5Cu).

Titanium rod production grade

National standard brands: TA1, TA2, TA3, TA7, TA9, TA10, TC4, TC4ELI, TC6, TC9, TC10, TC11

American standard brands: GR1, GR2, GR3, GR5, GR7, GR12

Titanium rod production status

Titanium rod production status:

Thermal processing state (R)

Cold working status (Y)

Annealing state (M)

Solid solution state (ST)

Titanium rod manufacturing process

Titanium rod manufacturing process:

Hot forging-hot rolling-turning (polishing)

Titanium rod implementation standards

National standards: GB/T2965-2007, GB/T13810, Q/BS5331-91

American standards: ASTM B348, ASTM F136, ASTM F67, AMS4928

Titanium alloys can be divided into three categories according to their phase composition: α alloys, (α+β) alloys and β alloys, which are represented by TA, TC and TB in China respectively.

① α alloy contains a certain amount of elements that stabilize the α phase, and is mainly composed of α phase in equilibrium. α alloy has a small specific gravity, good thermal strength, good weldability and excellent corrosion resistance. The disadvantage is low room temperature strength and is usually used as heat-resistant and corrosion-resistant materials. Alpha alloys can usually be divided into full alpha alloys (TA7), near alpha alloys (Ti-8Al-1Mo-1V) and alpha alloys with a small amount of compounds (Ti-2.5Cu). ② (α+β) alloy contains a certain amount of elements that stabilize the α phase and β phase. The structure of the alloy in equilibrium is α phase and β phase. (α+β) alloy has medium strength and can be strengthened by heat treatment, but its welding performance is poor. (α+β) alloys are widely used, among which the output of Ti-6Al-4V alloy accounts for more than half of all titanium materials.

③ β alloy contains a large number of elements that stabilize the β phase and can retain all the high-temperature β phase to room temperature. Beta alloys can usually be divided into heat-treatable beta alloys (metastable beta alloys and near-metastable beta alloys) and heat-stable beta alloys. Heat-treatable β alloy has excellent plasticity in the quenched state, and can achieve a tensile strength of 130~140kgf/mm2 through aging treatment. Beta alloys are usually used as high-strength and high-toughness materials. The disadvantages are heavy specific gravity, high cost, poor welding performance, and difficult cutting processing.

1. Reference standards

1: GB 228 Metal tensile test method

2: GB/T 3620.1 Titanium and titanium alloy numbers and chemical compositions

3: GB/T3620.2 Chemical composition and composition tolerance of titanium and titanium alloy processed products

4: GB 4698 Titanium sponge, chemical analysis methods of titanium and titanium alloys

2. Technical requirements

1: The chemical composition of titanium and titanium alloy rods should comply with the provisions of GB/T 3620.1. When repeated testing is required, the allowable deviation of the chemical composition should comply with the provisions of GB/T 3620.2.

2: The diameter or side length of hot-processed rods and their allowable deviations should comply with the provisions of Table 1.

3: After hot processing, the bar is turned (ground) and cold rolled. The allowable diameter deviation of the cold drawn bar should comply with the provisions of Table 2.

4: The out-of-roundness of the turned (ground) bar after thermal processing should not be greater than half of its dimensional tolerance.

5: The variable length of the processed bar is 300-6000mm, and the variable length of the annealed bar is 300-2000mm. The fixed length or double length should be within the range of the indefinite length. The allowable deviation of the fixed length is +20mm ;The double length should also be included in the incision amount of the bar, and the amount of each incision is 5mm. The fixed length or double length should be specified in the contract.