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Reference Tables -- Titanium Grades
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Titanium Grades

The various Titanium Grades as defined by ASTM and ASME are numbered from 1 and upwards where all numbers except 6 and 8 are represented.

Most of the grades are of alloyed type with various additions of for example aluminium, vanadium, nickel, ruthenium, molybdenum, chromium or zirconium for the purpose of improving and/or combining various mechanical characteristics, heat resistance, conductivity, microstructure, creep, ductility, corrosion resistance etc. etc.

Palladium (Pd) and ruthenium (Ru), Nickel (Ni) and molybdenum (Mo) are elements which can be added to the pure titanium types in order to obtain a significant improvement of corrosion resistance particulary in slightly reducing environments where titanium otherwise might face some problems due to insufficient conditions for formation of the necessary protective oxidefilm on the metalsurface. The formation of a stable and substantially inert protective oxidefilm on the surface is otherwise the secret behind the extraordinary corrosion resistance of titanium .

The mechnical properties of commercially pure titanium are in fact controlled by "alloying" to various levels of oxygen and nitrogen to obtain strength levels varying between approximately 290 and 550 MPa. For higher strength levels alloying elements, e.g. Al and V have to be added. Ti3Al2,5V has a tensile strength of minimum 620MPa in annealed condition and minimum 860 MPa in the as cold worked and stress relieved condition. The CP-titanium grades are nominally all alpha in structure, whereas many of the titanium alloys have a two phase alpha + beta structure. There are also titanium alloys with high alloying additions having an entire beta phase structure. While alpha alloys cannot be heat treated to increase strength, the addition of 2,5% copper would result in a material which responds to solution treatment and ageing in a similar way to aluminium-copper.

Common ASTM/ASME Titanium Grades
Grade Description
Grade 1 Unalloyed titanium, low oxygen, low strength
Grade 2 Unalloyed titanium, standard oxygen, medium strength
Grade 3 Unalloyed titanium, medium oxygen, high strength
Grade 4 Unalloyed titanium, high oxygen, extra high strength
Grade 5 Titanium alloy (6% aluminum, 4% vanadium)
Grade 7 Unalloyed titanium plus 0.12% to 0.25% palladium, standard oxygen, medium strength
Grade 9 Titanium alloy (3% aluminum, 2.5% vanadium), high strength. Mainly aerospace applications
Grade 11 Unalloyed titanium plus 0.12% to 0.25% palladium, low oxygen, low strength
Grade 12 Titanium alloy (0.3% molybdenum, 0.8% nickel), high strength
Grade 13 Titanium alloy (0.5% nickel, 0.05% ruthenium), low oxygen
Grade 14 Titanium alloy (0.5% nickel, 0.05% ruthenium), standard oxygen
Grade 15 Titanium alloy (0.5% nickel, 0.05% ruthenium), medium oxygen
Grade 16 Unalloyed titanium plus 0.04% to 0.08% palladium, standard oxygen, medium strength
Grade 17 Unalloyed titanium plus 0.04% to 0.08% palladium, low oxygen, low strength
Grade 18 Titanium alloy (3% aluminum, 2.5% vanadium plus 0.04% to 0.08% palladium),
Grade 19 Titanium alloy (3% aluminum, 8% vanadium, 6% chromium, 4% zirconium, 4% molybdenum)
Grade 20 Titanium alloy (3% aluminum, 8% vanadium, 6% chromium, 4% zirconium, 4% molybdenum) plus 0.04% to 0.08% palladium
Grade 21 Titanium alloy (15% molybdenum, 3% aluminum, 2.7% niobium, 0.25% silicon)
Grade 23 Titanium alloy (6% aluminum, 4% vanadium, extra low interstitial, ELI)
Grade 24 Titanium alloy (6% aluminum, 4% vanadium) plus 0.04% to 0.08% palladium
Grade 25 Titanium alloy (6% aluminum, 4% vanadium) plus 0.3% to 0.8% nickel and 0.04% to 0.08% palladium
Grade 26 Unalloyed titanium plus 0.08% to 0.14% ruthenium, standard oxygen, medium strength
Grade 27 Unalloyed titanium plus 0.08% to 0.14% ruthenium, low oxygen,low strength
Grade 28 Titanium alloy (3% aluminum, 2.5% vanadium) plus 0.08% to 0.14% ruthenium
Grade 29 Titanium alloy (6% aluminum, 4% vanadium with extra low interstitial elements (ELI) plus 0.08% to 0.14% ruthenium

 

 

 

 

 

 

 

 

 


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