What are the differences between Chinese and international standards for the implementation of standards in the titanium industry?
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- Ellen
- Issue Time
- Jul 2,2025
Summary
There are differences between Chinese standards and international standards for the titanium industry in terms of chemical composition, mechanical properties, naming conventions, process requirements
There are differences between Chinese standards and international standards for the titanium industry in terms of chemical composition, mechanical properties, naming conventions, process requirements, and application areas. The following is a specific comparative analysis:
1、 Chemical composition differences
Industrial pure titanium (such as TA1/TA2 vs ASTM Grade 1/Grade 2)
Chinese standard (GB/T 3621-2022)
TA1 (purity ≥ 99.8%), TA2 (purity ≥ 99.6%), with slightly wider impurity requirements (such as O ≤ 0.20%, Fe ≤ 0.30%).
International standard (ASTM B265)
Grade 1 (purity ≥ 99.9%), Grade 2 (purity ≥ 99.5%), with stricter impurity control (such as O ≤ 0.18%, Fe ≤ 0.20%).
Ultra low gap element (ELI) alloy
Chinese standards (such as TA1ELI and TC4ELI) clearly stipulate that O ≤ 0.13% and Fe ≤ 0.20%, which is consistent with international standards (such as ASTM F67), but the naming rules for grades are different.
High purity titanium (4N grade and above)
Chinese standards (such as YS/T 1299-2019) have clear requirements for Fe ≤ 10ppm and O ≤ 50ppm for 4N grade titanium, but national standards (GB/T) do not cover this field and rely on enterprise standards (such as Baotai Q/BT 472).
International standards such as SEMI F67 have formed mature specifications and are used in high-end fields such as semiconductor target materials.
2、 Differences in mechanical properties
Intensity index
The tensile strength requirements for titanium alloy bars in Chinese standards (such as GB/T 2965-2023) are basically consistent with international standards (such as ASTM B381), but there are differences in the details of heat treatment processes for some alloys (such as TC4).
The mechanical properties of medical titanium alloys (such as TC4 ELI) are highly compatible with ISO 5832-3, but require additional biocompatibility testing (such as ISO 10993).
Plasticity index
The requirement for elongation rate in Chinese standards is slightly lower than that in international standards (such as ASTM B265 requiring ≥ 20%, while GB/T 3621-2022 requires ≥ 18%), which may affect the application of complex forming processes.