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TIMETAL ® Grade 12

TIMETAL ® Grade 12

TIMETAL ® Grade 12

Product catalog summary
Overview:
TIMETAL® Grade 12 is a titanium alloy known for its excellent corrosion resistance and higher strength compared to ASTM Grade 2. It is particularly effective against crevice corrosion in hot brines and offers superior resistance to acids. This alloy is approved for use in applications up to 600°F by the ASME Boiler Code.
Chemical Composition:
The alloy consists of Molybdenum (0.3% nominal), Nickel (0.8% nominal), Iron (0.15% nominal), with small amounts of Carbon, Nitrogen, Oxygen, and Hydrogen.
Physical Properties:
The density of TIMETAL® Grade 12 is 4.51 g/cm³. It has a tensile modulus of 103 GPa in tension and 42.7 GPa in torsion.
Thermal Properties:
At 75°F (24°C), the electrical resistivity is 52 µΩ.cm, specific heat capacity is 0.13 Btu/lb.°F, thermal conductivity is 11 Btu/ft.h.°F, and the coefficient of thermal expansion is 5.3 x 10-6/°F.
Mechanical Properties:
The ultimate tensile strength (UTS) is 70 ksi, with a 0.2% yield strength of 50 ksi. The elongation is 18%, and the reduction in area varies by product form.
Corrosion Resistance:
Grade 12 shows superior resistance to boiling non-aerated organic acids compared to Grades 2 and 7, particularly in citric and formic acids.
Figures and Graphs:
Figures illustrate the effects of temperature and pH on crevice corrosion, structural efficiency for pressure vessel design, and the impact of reducing acids and boiling nitric acid on corrosion resistance.
Contact Information:
For further information, TIMET provides contact details for their offices in North America and Europe, as well as technical support contacts.
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Catalog excerpts

TIMETAL ® Grade 12-1

TIMETAL® Grade 12 (ASTM Grade 12) is a lean titanium alloy with excellent corrosion resistance and higher strength than ASTM Grade 2. TIMETAL ® Grade 12 shows significant improvement over unalloyed titanium, particularly crevice corrosion in hot brines. It also offers excellent corrosion resistance to acids over unalloyed grades. The higher strength than Grade 2 or Grade 7 at room and elevated temperatures allow material and cost saving through use of thinner sections. Grade 12 is approved by ASME Boiler Code for use up to 600°F. PHYSICAL PROPERTIES PROPERTY VALUE English SI Coefficient of Thermal Expansion 10-6/°F (10-6/°C) 5.3 (9.54) Electrical Resistivity, ^Q.cm Specific Heat Capacity, Btu/lb.°F (J/kg) 0.13 (544) Thermal Conductivity A, Btu/ft.h. °F (W/m.K) 11 (19.02) 0.2% Yield Product UTS, ksi Strength, Elongation Form (MPa) ksi (%) Minimum Bend Radius (D/T) Flatten Ability (distance between platens) Tubing: 9 x nominal wall thickness Flaring Ability (% expansion of inside diameter)

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TIMETAL ® Grade 12-2

FIGURE 1 E FFE CT OF T E MPE RAT URE AND P H ON CRE VICE CO RROSI ON OF T IT ANI UM (GRA DE 2) CO MPA RE D T O G RA DE 12 IN SAT URAT E D NACL BRI NE FIGURE 2 ST RUCT URA L E FFICIE NCY F O R DE SIGN OF P RE S S URE VE SSE LS (PE R A SME DE SIGN AL LO WA BLE S) no hydrogen pickup or corrosion no corrosion crevice corrosion ASME Design Allowable / Unit.Density ASME Design Allow./Unit Density (ksi/lb/cu (ksi/lb/cu in) in) 120 hydrogen pickup and weight loss crevice corrosion FIGURE 3 E FFE CT OF RE D UCING ACID O N GE NE RA L CORRO SION OF VA RIO US IND UST RIA L T IT ANI UM GRA DE S The data and...

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