DESCRIPTION 
Titanium Grade 4, UNS R50700, is the highest-strength commercially pure, unalloyed titanium grade. It provides greater tensile and yield strength than Titanium Grades 1, 2 and 3 while retaining the corrosion resistance, weldability and lightweight performance associated with commercially pure titanium. Grade 4 contains higher oxygen than the lower-strength CP grades, which increases strength while reducing ductility. It is well suited for applications requiring a combination of strength, corrosion resistance and reliable fabrication in chemical processing, marine, aerospace, medical and industrial environments. 

PRODUCT FORMS 
Sheet, Strip, Plate 
 
SPECIFICATIONS 
ASTM B265, ASME SB-265, AMS 4901 
 
TYPICAL APPLICATIONS 
Chemical processing equipment, heat exchangers, condenser tubing and plates, desalination and marine components, airframe components, cryogenic vessels, pressure vessels, pickling baskets, medical and surgical components, hydraulic and instrumentation tubing, and lightweight fabricated parts requiring the highest strength of the commercially pure titanium grades. 
 
PROCESSING 
Titanium Grade 4 is typically supplied in the annealed condition for sheet, strip and plate. It is not hardenable by heat treatment, but it can be strengthened by cold work. Annealing may be used after forming or cold working to restore ductility, reduce residual stresses and improve dimensional stability. 
 
FORMING 
Grade 4 offers good formability for a high-strength commercially pure titanium grade, but it is less ductile and requires higher forming forces than Grades 1, 2 and 3. More severe forming operations may require generous bend radii, controlled tooling practices and intermediate annealing to reduce the risk of cracking. 
 
WELDING 
Titanium Grade 4 is readily weldable by standard titanium welding processes when proper inert gas shielding is used. Weld zones and adjacent heat-affected areas must be protected from oxygen, nitrogen and hydrogen contamination at elevated temperatures to maintain ductility, corrosion resistance and clean weld quality. 
 
CORROSION 
Grade 4 titanium forms a stable, adherent titanium oxide film that provides excellent corrosion resistance in seawater, chlorides, oxidizing acids, alkaline environments and many industrial chemical services. Its higher strength allows designers to use commercially pure titanium in more demanding load-bearing applications while maintaining strong resistance to corrosion. 

PHYSICAL PROPERTIES 
Density @ RT: 0.163 lb./in^3; Modulus of Elasticity in Tension: approximately 15.2 psi x 10^6; Specific Heat: approximately 0.127 BTU/°F/lb.; Thermal Conductivity: approximately 9.7 BTU/hr-ft-°F at room temperature; Mean Coefficient of Thermal Expansion: approximately 4.8 x 10^-6 in./in./°F from 68 to 212°F; Electrical Resistivity: approximately 55 micro ohm-cm at room temperature; Melting Point Range: approximately 3020°F. 

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