Titanium Grade 7, Annealed

Subcategory: Metal; Nonferrous Metal; Titanium Alloy; Unalloyed/Modified Titanium

Close Analogs: Titanium Grades 1,2,3,4,7,11,and 12 are all considered unalloyed and have similar mechanical properties.

Key Words: ASTM Grade 7; UNS R52400, CP titanium, C.P. titanium alloy

Component    Wt. % C Max 0.1   Fe Max 0.3   H Max 0.015   N Max 0.03   O Max 0.25   Pd 0.2   Ti 99

Material Notes:
Titanium Grade 11 is identical (0.2% Pd) except for impurity limits. Pd added for corrosion resistance. Sample was annealed 2 hr at 700°C.

Physical Properties	Metric	English	Comments
Density	4.5 g/cc	0.163 lb/in³
Mechanical Properties
Hardness, Brinell	200	200
Hardness, Knoop	222	222	Estimated from Brinell.
Hardness, Rockwell B	98	98
Hardness, Rockwell C	11	11	Converted from Brinell hardness. Value below normal HRC range, for comparison purposes only.
Hardness, Vickers	209	209	Estimated from Brinell.
Tensile Strength, Ultimate	430 MPa	62400 psi
Tensile Strength, Yield	340 MPa	49300 psi
Elongation at Break	28 %	28 %
Modulus of Elasticity	103 GPa	14900 ksi	in tension.
Compressive Yield Strength	340 MPa	49300 psi
Notched Tensile Strength	720 MPa	104000 psi	Kt (stress concentration factor) = 3.0
Ultimate Bearing Strength	930 MPa	135000 psi	e/D = 2
Bearing Yield Strength	660 MPa	95700 psi	e/D = 2
Poisson's Ratio	0.34	0.34
Charpy Impact	65 J	47.9 ft-lb	V-notch
Fatigue Strength	240 MPa	34800 psi	at 1E+7 cycles. Kt (stress concentration factor) = 2.7
Fatigue Strength	280 MPa	40600 psi	Unnotched at 1E+7 cycles.
Shear Modulus	39 GPa	5660 ksi
Shear Strength	380 MPa	55100 psi	Ultimate shear strength
Electrical Properties
Electrical Resistivity	5.5e-005 ohm-cm	5.5e-005 ohm-cm
Thermal Properties
Heat of Fusion	325 J/g	140 BTU/lb	High Purity Ti.
CTE, linear 20°C	8.6 µm/m-°C	4.78 µin/in-°F	20-93°C
CTE, linear 250°C	9.2 µm/m-°C	5.11 µin/in-°F	Unspecified heat treatment. Average over the range 0-315ºC
Specific Heat Capacity	0.523 J/g-°C	0.125 BTU/lb-°F
Thermal Conductivity	16.4 W/m-K	114 BTU-in/hr-ft²-°F
Melting Point	Max 1665 °C	Max 3030 °F	Liquidus
Liquidus	1665 °C	3030 °F
Maximum Service Temperature, Air	425 °C	797 °F	Continuous use
Maximum Service Temperature, Air	540 °C	1000 °F	Intermittent Use
Beta Transus	913 °C	1680 °F
Optical Properties
Emissivity (0-1)	0.3	0.3	High purity Ti at 710°C
Reflection Coefficient, Visible (0-1)	0.56	0.56	High purity Ti; visible light.

References for this datasheet.