Product Introduction

BT22 Titanium Alloy Bar has a nominal composition of Ti-5Al-5Mo-5V-1Cr-1Fe, corresponding to the Chinese grade TC18. It is a highly alloyed α+β type titanium alloy, featuring high strength, high plasticity, high toughness, and good welding performance, and is therefore widely used in the aerospace field.

Product Specifications

1. Chemical composition is shown in Table 1.

Table 1 Chemical composition
Main element				Impurity elements				Other elements
Al	Fe	V	Ti	O	C	N	H	Single	Total
4.4-5.7	0.5-1.5	4.0-5.5	Remaining quantity	0.18	0.08	0.05	0.015	0.1	0.3

2. The effect of temperature on the macrostructure of bar stock

The macrostructure of BT22 titanium alloy bar under different forging processes is shown in Figure 1.

Low-magnification microstructures of BT22 titanium alloy after heat treatment at four deformation temperatures — Figure 1 Low-magnification microstructures of BT22 titanium
alloy after heat treatment at four deformation temperatures

3. Effect of Temperature on Microstructure

The microstructure of specimens forged at different temperatures and subsequently subjected to double annealing heat treatment is shown in Figure 2.

Microstructure of BT22 titanium alloy after heat treatment at four different deformation temperatures — Figure 2 Microstructure of BT22 titanium alloy after
heat treatment at four different deformation temperatures

4. Effect of Temperature on Room Temperature Mechanical Properties

The effect of different deformation temperatures on the mechanical properties of BT22 titanium alloy is shown in Table 2.

Table 2 Effect of different deformation temperatures on room temperature mechanical properties
Deformation temperature	Sampling direction	Rm( σb )Mpa	Rp0.2( σp0.2 )Mpa	A( δ 5 )%	Z( ψ )%
880℃	L	1137	1056	10	23
880℃	T	1150	1057	10	20
870℃	L	1129	1057	9	29
870℃	T	1155	1070	11	20
865℃	L	1172	1095	14.5	38
865℃	T	1179	1094	11	21
860℃	L	1144	1057	15	35
860℃	T	1154	1063	10	23

Characteristics and Applications

BT22 titanium alloy bar have characteristics such as high strength, high toughness, and good hardenability. It is a near-β type titanium alloy with excellent overall performance. The outstanding properties of BT22 titanium alloy, including high-temperature resistance, corrosion resistance, and high strength, have attracted widespread attention in industries such as aerospace.

With the rapid development of China's aerospace materials field, the performance requirements for aerospace structural components are becoming increasingly stringent. In particular, improving the performance stability of titanium alloy materials in high-temperature environments is a breakthrough for the development of aerospace technology. BT22 titanium alloy bars are often used in large aircraft forgings, control systems, landing gear, and high-load-bearing aerospace structural components, and they have been widely applied in aircraft such as the Russian Il-76.

Product Details

The ingots used for manufacturing BT22 titanium alloy bar and forgings are melted using a vacuum self-consumable arc furnace. The number of melting cycles should not be less than three, and during the final stable stage of the last melting, the pressure should not exceed 5 Pa (excluding melting with inert gas addition).

The grade, condition, and specifications of BT22 titanium alloy bars are shown in Table 3.