CP Ti - Grade 4
UNS #R50700
Pure titanium undergoes an allotropic transformation from the hexagonal close-packed (hcp) alpha phase to the body-centered cubic beta phase at a temperature of 882.5ºC (1620.5ºF). Commercially pure (CP) titanium is unalloyed. At service temperatures, it consists of 100% hcp alpha phase. As a single-phase material, its properties are controlled by chemistry (iron and interstitial impurity elements) and grain size. CP titanium is classified into Grades 1, 2, 3, or 4, depending on strength and allowable levels of the elements iron, carbon, nitrogen, and oxygen. CP Ti - Grade 4 is the strongest of these grades, with a minimum yield strength of 480 MPa (70 ksi), and has the highest allowable oxygen and iron content of the grades. With strain hardening (cold work), the strength can be dramatically increased. Grade 4 combines excellent corrosion resistance, corrosion fatigue performance, and high strength, making it a candidate for many chemical and marine applications.
Type Analysis
- Carbon (Maximum) 0.08
- Titanium (Nominal) Balance
- Iron (Maximum) 0.50
- Nitrogen (Maximum) 0.05
- Hydrogen (Maximum) 0.015
- Oxygen (Maximum) 0.40
- Other, Total (Maximum) 0.40
