ASTM Grade 1 Titanium (UNS R50250) is a commercially pure titanium grade, known as the softest and most ductile among pure titanium alloys. It offers excellent cold formability, weldability, and corrosion resistance—particularly in mild to highly oxidizing environments. With a minimum titanium content of 99.1%, it balances formability and durability, making it ideal for applications requiring flexibility and resistance to harsh conditions.
Chemical Composition (Weight %)
Component
Content Range
Ti
Min 99.1 (balance)
C
Max 0.08
Fe
Max 0.2
H
Max 0.015
N
Max 0.03
O
Max 0.18
Industry Specifications
Region/Industry
Specifications
Germany Engineering
3.7025
Germany Aerospace
3.7024
France
T-35
UK Aerospace
BS TA.1
Physical Properties
Property
Metric
English
Comments
Density
4.51 g/cc
0.163 lb/in³
Typical
Electrical Resistivity
4.5e-005 ohm-cm
4.5e-005 ohm-cm
Mechanical Properties
Property
Metric
English
Notes
Tensile Strength (Ultimate)
345 MPa
50,000 psi
Typical
Tensile Strength (Yield, 0.2% Proof)
220 MPa
31,900 psi
Typical
Elongation at Break
35%
35%
Typical
Reduction of Area
70%
70%
Typical
Modulus of Elasticity
105 – 120 GPa
15,200 – 17,400 ksi
Typical
Fatigue Strength (Notched, Kt=3)
123 MPa
17,800 psi
Limit at 10⁷ cycles; rotating bend
Fatigue Strength (Smooth, Kt=1)
193 MPa
28,000 psi
Limit at 10⁷ cycles; rotating bend
Minimum Bend Radius
2t
2t
For 0.078 in (2 mm) sheet
Thermal Properties
Property
Metric
English
Notes
Linear CTE (20°C)
8.6 μm/m-°C
4.78 μin/in-°F
20–100°C
Linear CTE (250°C)
9.5 μm/m-°C
5.28 μin/in-°F
20–300°C
Linear CTE (500°C)
9.7 μm/m-°C
5.39 μin/in-°F
20–500°C
Thermal Conductivity
21.97 W/m-K
152 BTU-in/hr-ft²-°F
Maximum Service Temp (Air)
425°C (continuous); 540°C (intermittent)
797°F (continuous); 1000°F (intermittent)
Retains properties within range
Beta Transus Temperature
890°C
1630°F
Applications
Widely used in industries requiring formability and corrosion resistance:
Marine and chemical processing (parts in harsh environments, pickling baskets).
