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. % C Max 0.1   Fe Max 0.5   H Max 0.015   N Max 0.05   O Max 0.4   Ti 99

Material Notes:
Information provided by Allvac and the references.

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

Physical Properties	Metric	English	Comments
Density	4.51 g/cc	0.163 lb/in³
Mechanical Properties
Hardness, Brinell	265	265	annealed
Hardness, Knoop	215	215	unwelded sheet
Hardness, Rockwell B	100	100	annealed
Hardness, Rockwell B	23	23	unwelded sheet
Hardness, Rockwell C	23	23	Estimated from Brinell.
Hardness, Vickers	280	280	Estimated from Brinell.
Tensile Strength, Ultimate	550 MPa	79800 psi
Tensile Strength, Yield	480 - 552 MPa	69600 - 80100 psi
Elongation at Break	15 %	15 %
Reduction of Area	30 %	30 %
Modulus of Elasticity	105 GPa	15200 ksi	In Tension
Compressive Modulus	110 GPa	16000 ksi
Ultimate Bearing Strength	695 MPa	101000 psi
Bearing Yield Strength	830 MPa	120000 psi	2% permanent set
Poisson's Ratio	0.37	0.37
Fatigue Strength	250 MPa	36300 psi	at 1E+7 cycles. Kt (stress concentration factor) = 2.7
Fatigue Strength	290 MPa	42100 psi	at 100,000 cycles; Kt (stress concentration factor) = 2.7
Fatigue Strength	425 MPa	61600 psi	1E+7 cycles, Unnotched
Fatigue Strength	517 MPa	75000 psi	Unnotched 100,00 Cycles
Fracture Toughness	99 - 140 MPa-m½	90.1 - 127 ksi-in½	for K(Q) annealed
Shear Modulus	40 GPa	5800 ksi
Electrical Properties
Electrical Resistivity	6e-005 ohm-cm	6e-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	0-100ºC
CTE, linear 250°C	9.2 µm/m-°C	5.11 µin/in-°F	Average over the range 0-315ºC
CTE, linear 500°C	9.7 µm/m-°C	5.39 µin/in-°F	0-540ºC; CTE is higher perpendicular to the c-axis
Specific Heat Capacity	0.53 J/g-°C	0.127 BTU/lb-°F	value at 540ºC is 0.67 J/g-ºC
Thermal Conductivity	17.2 W/m-K	119 BTU-in/hr-ft²-°F
Melting Point	Max 1660 °C	Max 3020 °F	Liquidus
Liquidus	1660 °C	3020 °F
Beta Transus	950 °C	1740 °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.