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Reference

Titanium Grades And UNS Numbers

Every titanium grade we produce, with its description and its UNS number.

Gr.1 to Gr.23Alpha beta alloysBeta alloysNiTi SMA

Full List

Grades We Produce

GradeDescriptionUNS
Gr.1Commercially pure titaniumUNS R50250
Gr.2Commercially pure titaniumUNS R50400
Gr.3Commercially pure titaniumUNS R50550
Gr.4Commercially pure titaniumUNS R50700
Gr.7Ti with palladiumUNS R52400
Gr.11Ti with palladiumUNS R52250
Gr.16Ti with palladiumUNS R52402
Gr.17Ti with palladiumUNS R52252
Gr.9Ti 3-2.5UNS R56320
Gr.18Ti 3-2.5 with palladiumUNS R56322
Gr.5Ti 6-4UNS R56400
Gr.23Ti 6-4 ELIUNS R56407
Gr.6Ti 5-2.5UNS R54520
Gr.12Ti with molybdenum and nickelUNS R53400
Ti 6-2-4-2Alpha beta alloyUNS R54620 / R54621
Ti 6-2-4-6Alpha beta alloyUNS R56260
Ti 6-6-2Alpha beta alloyUNS R56620
Ti 6-7Alpha beta alloyUNS R56700
Ti 8-1-1Near alpha alloyUNS R54810
Ti 15-333Beta alloyUNS R58153
Ti 15MoBeta alloyUNS R58150
Ti 17Beta rich alpha beta alloyUNS R58650
Ti 38-644Beta alloyUNS R58640
TiMoZrFeTMZF beta alloy—
NiTi SEASuperelastic alloys—
NiTi SMAShape memory alloys—

Grade and UNS pairings as supplied by HLMET. Ti-6Al-4V under Gr.5 UNS R56400 is the alloy used for every fastener listed on this site.

How To Use It

Reading A Titanium Grade

A titanium grade number and a UNS number describe the same thing from two directions. The ASTM grade number is the shorthand used on drawings and in purchase orders. The UNS number is the unique five character identifier that removes any ambiguity between standards bodies, which is why both are given here.

Commercially pure grades run from Gr.1 to Gr.4 with strength rising and formability falling as the number increases. The palladium bearing grades Gr.7 Gr.11 Gr.16 and Gr.17 pair a small palladium addition with a commercially pure base for reducing acid service. The alloys carry their alloying elements in the name, so Ti 6-4 is 6 percent aluminium and 4 percent vanadium, and Ti 6-2-4-2 is 6 aluminium 2 tin 4 zirconium 2 molybdenum.

Ti 6-4

Grade 5 In Detail

Alloy designationTi-6Al-4V, ASTM Grade 5
UNS numberR56400
Nominal composition6 percent aluminium, 4 percent vanadium, balance titanium
Alloy classAlpha beta alloy
Density4.43 g/cm³
Minimum tensile strength895 MPa / 130 ksi
Minimum yield strength828 MPa / 120 ksi
Minimum elongation10 percent
Modulus of elasticityAbout 114 GPa
Magnetic responseNon magnetic
Melting rangeAbout 1604 to 1660 °C

Grade 5 is the alloy used for every fastener held in stock on this site. See the stock list.

FAQ

Frequently Asked Questions

What is the UNS number for Grade 5 titanium
UNS R56400. Grade 5 is the Ti-6Al-4V alloy, nominally 6 percent aluminium and 4 percent vanadium with the balance titanium.
What is the difference between Grade 5 and Grade 23
Grade 23 is the extra low interstitial version of the same alloy, carried under UNS R56407. It trades a little strength for better fracture toughness and ductility.
Which grades are commercially pure
Grades 1 2 3 and 4, carried under UNS R50250 R50400 R50550 and R50700. Strength rises and formability falls as the grade number increases.
Why do some grades contain palladium
Grades 7 11 16 and 17 carry a small palladium addition that improves resistance in reducing acid environments where the unalloyed metal would be attacked.
Do you supply NiTi shape memory alloys
Yes. We produce NiTi superelastic alloys and NiTi shape memory alloys alongside the titanium grades listed above.

Ask Us About Your Application

Send the joint the duty and the environment. We will tell you which grade and which size suits it and quote against that.

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