BT22 Titanium Alloy Plate

The main alloying elements of BT22 Titanium Alloy Plate are Al, Mo, V, Cr, and Fe. Its nominal composition is Ti-5Al-5Mo-5V-1Cr-1Fe, with nominal aluminum equivalent and molybdenum equivalent of 5.0 and 11.76, respectively, and a theoretical phase transformation temperature of 870±20℃. This alloy is a near-β type with a high degree of alloying, offering relatively high strength. Its corresponding domestic grade is TC18, developed and produced by the National Aerospace Materials Research Institute of the former Soviet Union in the mid-1970s. Due to its excellent high strength, high toughness, and high hardenability, it is referred to in the industry as a "triple-high" titanium alloy. In the annealed state, its tensile strength can reach 1080 MPa (the highest room temperature strength among annealed titanium alloys, with a maximum working temperature of 400℃). After strengthening heat treatment, its tensile strength can exceed 1200 MPa, while also exhibiting excellent elongation, good reduction of area, and impact toughness. These characteristics make it an ideal material for the aerospace and engine industry.

1. Chemical composition is shown in Table 1.

2. Physical Properties

The BT22 Titanium Alloy Plate has a density of 4.62 g/cm³, a shear modulus of 40.8 GPa, an elastic modulus of 113 GPa, and a phase transition temperature of 840-880°C. The specific heat capacity, thermal conductivity, electrical resistivity, and coefficient of linear expansion are shown in Tables 2, 3, and 4, respectively.

3. Mechanical properties are shown in Table 5.

During the production process of BT22 titanium alloy plate, surface treatment is a crucial procedure. The purpose of this process is to remove the oxide layer and other defects that affect surface quality, which are generated on the surfaces of semi-finished and finished products during heating, hot rolling, and other processes. Surface treatment can be carried out using mechanical methods (grinding) and chemical methods (alkaline and acid cleaning).

(1) Grinding TreatmentBefore production, measure the plate thickness at multiple positions and record the measurements in detail. Perform targeted peeling treatment on the surface. After peeling, polish with a flap wheel to improve plate smoothness. During polishing, the underside should be cleaned thoroughly or protected with cardboard or other materials to prevent foreign particles like grinding wheel dust from embedding in the plate surface and causing scrap. Cracks formed on the surface during rolling, as well as defects that affect surface quality such as indentations and inclusions, should be removed. The direction of removal should be consistent with the direction of the subsequent rolling step.

(2) Alkaline and Acid Cleaning TreatmentAlkaline cleaning converts oxides formed during heating and hot rolling into titanate compounds that are soluble in acid. Then, with the help of acid, this oxide layer is removed, ultimately restoring the original luster and properties of the plate. 

BT22 Titanium Alloy Plate possesses high strength, relatively high toughness, good plasticity, and excellent welding performance, with a hardenability depth of up to 200mm. This alloy can be used to manufacture engine fan disks and blades (operating temperature generally does not exceed 350°C), as well as fasteners for airframes, wing load-bearing components, and control systems that operate at certain temperatures (operating temperature 350-400°C). In aircraft structural components, replacing some high-strength steel with BT22 titanium alloy can achieve weight reduction. Some parts can be reduced in weight by more than 15%-20%. Its excellent overall performance and weight reduction effects still have great potential for application in the aerospace and military fields.

The BT22 titanium alloy plate has a very wide range of applications in the aviation industry. Currently, international advanced aircraft and engines have increasingly complex requirements for structural and functional use, and the comprehensive performance requirements for the processing, forming, and welding of parts made from materials are becoming higher. BT22 titanium alloy, with its high strength, high toughness, high ductility, excellent welding performance, and good performance at medium to high temperatures, is capable of widely meeting the various demands of aircraft and aviation engine components, as shown in Table 6.

Hot Tags: bt22 titanium alloy plate, China bt22 titanium alloy plate manufacturers, suppliers, factory