Grades Guide
Data
(Ti-0.3Mo-0.8Ni, ASTM Grade 12 Titanium) Technical Data Sheet
Description:
Titanium Grade 12 (UNS R53400) is a highly corrosion resistant alloy containing small additions of nickel and molybdenum, which enhance corrosion resistance and increase the strength of the alloy to give better mechanical properties than the commercially pure grades. It is used in mildly reducing or fluctuating conditions. In particular, it is used instead of the commercial purity grades (e.g. grade 2) for better resistance to crevice corrosion in hot brines, and where the extra strength allows the use of lighter sections.
Highly weldable, near alpha titanium alloy exhibiting improved strength and optimum ASMA code design allowables at increased temperatures, combined with superior crevice corrosion resistance and excellent resistance under oxidising to mildly reducing conditions, especially chlorides. At room temperature it is an alpha alloy, and may contain minor amounts of beta phase. It transforms to beta phase at 890°C ± 15°C
Principle Design Features:
This near-alpha alloy combines excellent strength at high temperatures with excellent weldability and crevice corrosion resistance. Titanium Grade 12 offers a beneficial combination of superior corrosion resistance and strength. Able to be welded, forged and cold worked – it can be machined by usual procedures.
Microstructure: Equiaxed alpha, with acicular alpha, primarily in welds or heat-affected zones, small amounts of beta.
Ti Grade 12 is characterized by excellent corrosion resistance in reducing and oxidizing environments and offers better heat resistance than pure titanium grades. Titanium Grades 1,2,3,4,7,11,and 12 are all considered unalloyed and have similar mechanical properties. Addition of 0.3% Mo and 0.8% Ni to titanium increases corrosion resistance at a lower cost than Pd (see Ti Grades 7 and 11). Higher strength than unalloyed Ti grades 1 - 4, yet still formable.
Titanium Grade 12 is similar to Grade 2 and Grade 3 except Grade 12 has the addition of Mo and Ni. These additions to Grade 12 offer a lower cost option than the Palladium bearing grades. Grade 12 has high strength, good heat and wear resistance and is highly weldable. Grade 12 is used for Chemical Processing, Power generation, Desalination, Marine Hydrocarbon processing and Mining.
Grade 12 titanium applications:
Elevated temperature chemical manufacturing
Shell and heat exchangers
Hydrometallurgical applications
Marine and airfare components
Specifications:
ASTM B348 Gr12 bar
ASTM B337 Gr12 pipe (withdrawn)
ASTM B265 Gr12 Sheet/plate
ASTM F467 Gr12 nuts
ASTM F468 Gr12 bolts
ASTM B367 Gr12 castings
ASTM B338 Gr12 heat exchange tube*
ASTM B381 Gr12 forgings
Titanium Grade 12 alloy is similar to Titanium Grades 2 and 3 except that Titanium Grade 12 has 0.3% molybdenum and 0.8% nickel. This offers enhanced corrosion resistance.
Fabrication:
Weldability – Good
Annealing – 732-816°C (1350-1500°F)
Stress Relief Annealing – 538-649°C (1000-1200°F), 1 hr, AC.
Pressure Vessels:
AS1210 & ASME Boiler & Pressure Vessel Code pre-qualify Titanium 12 for use in pressure vessels up to 300°C.
Availability:
ZircoSCM can supply Titanium Grade 12 as plate, sheet and strip, rod and bar, seamless and welded pipe, weld fittings, seamless and welded tube, forging billet and forgings.
Titanium Grade 12 (UNS R53400) is a highly corrosion resistant alloy containing small additions of nickel and molybdenum, which enhance corrosion resistance and increase the strength of the alloy to give better mechanical properties than the commercially pure grades. It is used in mildly reducing or fluctuating conditions. In particular, it is used instead of the commercial purity grades (e.g. grade 2) for better resistance to crevice corrosion in hot brines, and where the extra strength allows the use of lighter sections.
Highly weldable, near alpha titanium alloy exhibiting improved strength and optimum ASMA code design allowables at increased temperatures, combined with superior crevice corrosion resistance and excellent resistance under oxidising to mildly reducing conditions, especially chlorides. At room temperature it is an alpha alloy, and may contain minor amounts of beta phase. It transforms to beta phase at 890°C ± 15°C
Chemical composition (nominal) %
Ti | O | C | H | N | Fe | Mo | Ni |
Bal. | ≤0.18 | ≤0.08 | ≤0.015 | ≤0.03 | ≤0.30 | 0.2–0.4 | 0.6–0.9 |
Tensile requirements
Grade | Tensile strength(min) | Yeild strength(min) | Elongation (%) | ||
ksi | MPa | ksi | MPa | ||
12 | 70 | 438 | 50 | 345 | 18 |
This near-alpha alloy combines excellent strength at high temperatures with excellent weldability and crevice corrosion resistance. Titanium Grade 12 offers a beneficial combination of superior corrosion resistance and strength. Able to be welded, forged and cold worked – it can be machined by usual procedures.
Microstructure: Equiaxed alpha, with acicular alpha, primarily in welds or heat-affected zones, small amounts of beta.
Ti Grade 12 is characterized by excellent corrosion resistance in reducing and oxidizing environments and offers better heat resistance than pure titanium grades. Titanium Grades 1,2,3,4,7,11,and 12 are all considered unalloyed and have similar mechanical properties. Addition of 0.3% Mo and 0.8% Ni to titanium increases corrosion resistance at a lower cost than Pd (see Ti Grades 7 and 11). Higher strength than unalloyed Ti grades 1 - 4, yet still formable.
Titanium Grade 12 is similar to Grade 2 and Grade 3 except Grade 12 has the addition of Mo and Ni. These additions to Grade 12 offer a lower cost option than the Palladium bearing grades. Grade 12 has high strength, good heat and wear resistance and is highly weldable. Grade 12 is used for Chemical Processing, Power generation, Desalination, Marine Hydrocarbon processing and Mining.
Grade 12 titanium applications:
Elevated temperature chemical manufacturing
Shell and heat exchangers
Hydrometallurgical applications
Marine and airfare components
Specifications:
ASTM B348 Gr12 bar
ASTM B337 Gr12 pipe (withdrawn)
ASTM B265 Gr12 Sheet/plate
ASTM F467 Gr12 nuts
ASTM F468 Gr12 bolts
ASTM B367 Gr12 castings
ASTM B338 Gr12 heat exchange tube*
ASTM B381 Gr12 forgings
Titanium Grade 12 alloy is similar to Titanium Grades 2 and 3 except that Titanium Grade 12 has 0.3% molybdenum and 0.8% nickel. This offers enhanced corrosion resistance.
Fabrication:
Weldability – Good
Annealing – 732-816°C (1350-1500°F)
Stress Relief Annealing – 538-649°C (1000-1200°F), 1 hr, AC.
Pressure Vessels:
AS1210 & ASME Boiler & Pressure Vessel Code pre-qualify Titanium 12 for use in pressure vessels up to 300°C.
Availability:
ZircoSCM can supply Titanium Grade 12 as plate, sheet and strip, rod and bar, seamless and welded pipe, weld fittings, seamless and welded tube, forging billet and forgings.