UNS is the abbreviation of ‘UNIFIED NUMBERING SYSTEM’, in short, UNS code replaces or supplements the product numbering system of the current standards, refer to ASTM E527 - Recommended Methods for Numbering Metals and Alloys (UNS).UNS numbering system is composed of UNS plus one letter and five Arabic numerals. The UNS numbering system is UNS plus a letter and five Arabic numerals. In general, the UNS numbering system is generally applicable to U.S. grade requirements, while the requirements of other countries may differ slightly from the material requirements of the UNS numbering system.
This article mainly introduces titanium and titanium alloys commonly and infrequently used codes corresponding to the U.S. grade, as well as China's titanium and titanium alloys grades TA, TB, TC series comparison.
Use the titanium alloy grades against the UNS code as follows:
|
UNS |
American Grade |
Chinese Grade |
|
UNS R50250 |
Gr1 |
TA1 |
|
UNS R50400 |
Gr2 |
TA2 |
|
UNS R56400 |
Gr5 |
TC4 |
|
UNS R52400 |
Gr7 |
TA9 |
|
UNS R53400 |
Gr2 |
TA10 |
A comparison of American Standard Grades 1 to 38 with UNS codes is shown below:
|
UNS |
American Grade |
Main alloy composition (residual: titanium) |
|
UNS R50250 |
Gr1 |
Commercially Pure Titanium |
|
UNS R50400 |
Gr2 |
Commercially Pure Titanium |
|
UNS R50550 |
Gr3 |
Commercially Pure Titanium |
|
UNS R50700 |
Gr4 |
Commercially Pure Titanium |
|
UNS R56400 |
Gr5 |
6% aluminium + 4% vanadium |
|
UNS R54520 |
Gr6 |
5% aluminium + 2.5% tin |
|
UNS R52400 |
Gr7 |
0.12 to 0.25% palladium |
|
UNS R56320 |
Gr9 |
3% aluminium + 2.5% vanadium |
|
UNS R52250 |
Gr11 |
0.12 to 0.25 per cent palladium |
|
UNS R53400 |
Gr12 |
0.3% molybdenum + 0.8% nickel |
|
UNS R53413 |
Gr13 |
0.5% nickel + 0.05% ruthenium |
|
UNS R53414 |
Gr14 |
0.5% nickel + 0.05% ruthenium |
|
UNS R53415 |
Gr15 |
0.5% nickel + 0.05% ruthenium |
|
UNS R52402 |
Gr16 |
0.04 to 0.08% palladium |
|
UNS R52252 |
Gr17 |
0.04 to 0.08 per cent palladium |
|
UNS R56322 |
Gr18 |
3% aluminium + 2.5% vanadium + 0.04~0.08% palladium |
|
UNS R58640 |
Gr19 |
3% aluminium + 8% vanadium + 6% chromium + 4% zirconium + 4% molybdenum |
|
UNS R58645 |
Gr20 |
3% aluminium + 8% vanadium + 6% chromium + 4% zirconium + 4% molybdenum + 0.04 to 0.08 palladium |
|
UNS R58210 |
Gr21 |
15% molybdenum + 3% aluminium + 2.7% niobium + 0.25% silicon |
|
UNS R56407 |
Gr23 |
6% Aluminium + 4% Vanadium ELI Low Tissue Gap |
|
UNS R56405 |
Gr24 |
6% aluminium + 4% vanadium + 0.04~0.08 palladium |
|
UNS R56403 |
Gr25 |
6% aluminium + 4% vanadium + 0.04~0.08 palladium + 0.3~0.8% nickel |
|
UNS R52404 |
Gr26 |
0.08-0.14 per cent ruthenium |
|
UNS R52254 |
Gr27 |
0.08-0.14 per cent ruthenium |
|
UNS R56323 |
Gr28 |
3% aluminium + 2.5% vanadium + 0.08-0.14% ruthenium |
|
UNS R56404 |
Gr29 |
6% aluminium + 4% vanadium + 0.08-0.14% ruthenium |
|
UNS R53530 |
Gr30 |
0.3% cobalt + 0.05% palladium |
|
UNS R53532 |
Gr31 |
0.3% cobalt + 0.05% palladium |
|
UNS R55111 |
Gr32 |
5% aluminium + 1% tin + 1% zirconium + 1% vanadium + 0.8% molybdenum |
|
UNS R53442 |
Gr33 |
0.4% nickel + 0.015% palladium + 0.025% ruthenium + 0.15% chromium |
|
UNS R53445 |
Gr34 |
0.4% nickel + 0.015% palladium + 0.025% ruthenium + 0.15% chromium |
|
UNS R56340 |
Gr35 |
4.5% aluminium + 2% molybdenum + 1.6% vanadium + 0.5% iron + 0.3% silicon |
|
UNS R58450 |
Gr36 |
45% niobium |
|
UNS R52815 |
Gr37 |
1.5% aluminium |
|
UNS R54250 |
Gr38 |
4% aluminium + 2.5% vanadium + 1.5% iron |
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