GJB 10332-2021
Specification for TC4 titanium alloy thin-walled pipes for aerospace use (English Version)
- Standard No.
- GJB 10332-2021
- Language
- Chinese, Available in English version
- Release Date
- 2021
- Published By
- Military Standard of the People's Republic of China-General Armament Department
- Latest
- GJB 10332-2021
- Introduction
Standard Overview and Technical Background
GJB 10332-2021 is my country's first military standard specifically formulated for aerospace TC4 titanium alloy thin-walled tubes, which was promulgated by the Equipment Development Department of the Central Military Commission on December 30, 2021. The standard specifies the technical requirements for thin-walled tubes with an outer diameter of 26-65mm, a wall thickness of 3-10mm, and a length of 165-570mm. It is mainly used in the manufacture of main load-bearing structural parts for spacecraft such as launch vehicles and satellites.
Analysis of core technical requirements
1. Material and processing requirements
Project GJB 10332 requirements Comparison with general industrial standards Raw material grade Titanium sponge ≥ Grade 1 (GB/T 2524) Grade 2 is allowed Smelting process Vacuum consumable arc furnace ≥ 2 times 1 time melting is acceptable Final smelting pressure ≤5Pa ≤10Pa 2. Key performance indicators
The standard stipulates that the annealed (M) pipe has a tensile strength ≥ 895MPa, yield strength ≥ 825MPa, and an elongation ≥ 10%, which is about 15% higher than the civilian standard. Typical application case: After the Long March 5 rocket fuel delivery system uses this standard pipe, the weight reduction effect reaches 30% while ensuring the pressure bearing requirements.
Detection and quality control
1. Ultrasonic detection standard
The GB/T 12969.1 method is used, and the artificial defect standard is: U-shaped groove length 23±2mm×width ≤0.8mm×depth 0.37±0.02mm, which is 20% higher than the aviation standard detection sensitivity.
2. Microstructure requirements
It must be a processed structure in the α+β two-phase region, and the original β grain boundary is prohibited. The equiaxed α phase and the deformed α phase are allowed to coexist. A typical case of batch scrapping caused by excessive β spots in the production of a certain type of satellite bracket.
Implementation suggestions
- It is recommended to use a three-time vacuum self-consumption process in the melting process to ensure the control of impurity elements
- After machining, 700-800℃/1-3h annealing treatment is required to optimize performance
- It is recommended to establish a digital ultrasonic testing file to achieve full life cycle traceability
Technology evolution analysis
Compared with the 2008 version of the navigation mark, this specification has added: ① Pressure monitoring requirements for the melting process ② Quantitative evaluation standards for microstructure ③ Digital detection method for wall thickness uniformity. It reflects the upgrade of quality control of my country's aerospace materials from qualitative to quantitative.
GJB 10332-2021 history
- 2021 GJB 10332-2021 Specification for TC4 titanium alloy thin-walled pipes for aerospace use