Titanium Grade 4


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 4: UNS R50700, CP titanium, C.P. titanium alloy

Component   Wt. %
CMax 0.1 
FeMax 0.5 
HMax 0.015 
N Max 0.05 
OMax 0.4 
Ti99 

Material Notes:
Information provided by Allvac and the references.

Applications: Airframe components, cryogenic vessels, heat exchangers, CPI equipment, condenser tubing, pickling baskets.

Physical PropertiesMetricEnglishComments
Density4.51 g/cc0.163 lb/in 

Mechanical Properties
Hardness, Brinell265265 annealed
Hardness, Knoop215215 unwelded sheet
Hardness, Rockwell B100100 annealed
Hardness, Rockwell B2323 unwelded sheet
Hardness, Rockwell C2323 Estimated from Brinell.
Hardness, Vickers280280 Estimated from Brinell.
Tensile Strength, Ultimate550 MPa79800 psi 
Tensile Strength, Yield480 - 552 MPa69600 - 80100 psi 
Elongation at Break15 %15 % 
Reduction of Area30 %30 % 
Modulus of Elasticity105 GPa15200 ksi In Tension
Compressive Modulus110 GPa16000 ksi 
Ultimate Bearing Strength695 MPa101000 psi 
Bearing Yield Strength830 MPa120000 psi 2% permanent set
Poisson's Ratio0.370.37 
Fatigue Strength250 MPa36300 psi at 1E+7 cycles. Kt (stress concentration factor) = 2.7
Fatigue Strength290 MPa42100 psi at 100,000 cycles; Kt (stress concentration factor) = 2.7
Fatigue Strength425 MPa61600 psi 1E+7 cycles, Unnotched
Fatigue Strength517 MPa75000 psi Unnotched 100,00 Cycles
Fracture Toughness99 - 140 MPa-m90.1 - 127 ksi-in for K(Q) annealed
Shear Modulus40 GPa5800 ksi 

Electrical Properties
Electrical Resistivity6e-005 ohm-cm6e-005 ohm-cm 

Thermal Properties
Heat of Fusion325 J/g140 BTU/lb High Purity Ti.
CTE, linear 20C8.6 m/m-C4.78 in/in-F 0-100C
CTE, linear 250C9.2 m/m-C5.11 in/in-F Average over the range 0-315C
CTE, linear 500C9.7 m/m-C5.39 in/in-F 0-540C; CTE is higher perpendicular to the c-axis
Specific Heat Capacity0.53 J/g-C0.127 BTU/lb-F value at 540C is 0.67 J/g-C
Thermal Conductivity17.2 W/m-K119 BTU-in/hr-ft-F 
Melting PointMax 1660 CMax 3020 F Liquidus
Liquidus1660 C3020 F 
Beta Transus950 C1740 F 

Optical Properties
Emissivity (0-1)0.30.3 High purity Ti at 710C
Reflection Coefficient, Visible (0-1)0.560.56 High purity Ti; visible light.

References for this datasheet.


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