TA1/TA2 Pure Titanium Oxygen Content Standard (GB/T 3620.1-2016)
| Model |
TA1
|
TA2 |
| products |
 |
 |
| Oxygen content ≤ 0.12% | ≤ 0.12% | ≤ 0.25% |
| purity of titanium | ≥ 99.5% | ≥ 99.2% |
| Core supporting impurity limits | Nitrogen ≤ 0.03%, Iron ≤ 0.20%, Carbon ≤ 0.08% | Nitrogen ≤ 0.05%, Iron ≤ 0.30%, Carbon ≤ 0.08% |
The oxygen content of TA1 and TA2 determines the performance differences
1. Differences between plasticity and toughness
TA1 has a lower oxygen content and fewer internal lattice gap impurities. Its material extensibility, cold stamping performance, and low-temperature toughness are significantly superior to TA2. It can withstand deep stretching, bending, spinning, and complex irregular stamping processing, and is less prone to cracking and brittle fracture; TA2 has a higher oxygen content, resulting in decreased plasticity. The tolerance rate for complex forming processes is lower, and it is only suitable for conventional simple bending and sheet metal processing.
2. Differences in strength and hardness
Oxygen is a strengthening element for pure titanium. The higher the oxygen content, the higher the hardness and tensile strength of the titanium material. TA2 has a higher oxygen content limit and overall strength and hardness are slightly higher than TA1. It has better rigidity and is suitable for bearing conventional loads for structural components; TA1 is softer and has greater toughness, with lower strength, and is mainly used for precision forming and low-temperature working conditions.
3. Differences in welding performance
TA1's low-oxygen characteristic makes the welding molten pool purer, with fewer weld porosities and lower crack risks. The welding plasticity, corrosion resistance are excellent, and it is not prone to brittleness after welding, suitable for precision welding, thin-walled welding, and vacuum welding; TA2's high-oxygen content is prone to reducing weld toughness, and the material becomes harder and more brittle after welding, with a lower precision welding yield rate than TA1.
4. Differences in corrosion resistance and low-temperature performance
Low-oxygen TA1 has a denser and more uniform oxide film, with more stable acid and alkali corrosion resistance and seawater corrosion resistance. It also has no cold brittleness phenomenon at low temperatures, suitable for low-temperature and severely corrosive working conditions; TA2 has slightly weaker corrosion resistance and may experience toughness attenuation at low temperatures.
The Industry Importance of Oxygen Content Indicators
Oxygen is the most critical controlling impurity in pure titanium materials, directly determining the processing performance, operating conditions, product grade and price of the materials. It is a core indicator for material selection, quality inspection and acceptance, and shipment in the industry.
- Limits the upper limit of forming process: Excessive oxygen will directly cause titanium plates to crack during stretching, and edges to break during bending. It makes it impossible to manufacture thin-walled, irregular, and high-precision stamping parts. It is a core quality control point for precision sheet metal and irregular titanium components.
- Controls the quality of welding products: Excessive oxygen content is the primary cause of welding pores, brittle fractures, and weld failure in titanium materials. Welding parts for pressure vessels, vacuum equipment, and chemical equipment must strictly control the oxygen content.
Ensure service life under guaranteed conditions: Under harsh corrosive, low-temperature, and high-frequency stress conditions, excessive oxygen content will accelerate material aging, brittleness, and corrosion failure, significantly shortening the service life of equipment components.
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