AWS A5.16 ERTi-2
AWS A5.16-13 ERTi-2
ERTi-2 (CP-2) Commercially Pure Titanium is the “workhorse” of the industrial corrosion market and most common unalloyed grade. Grade 2 is generally the most readily available in all product forms and has the lowest cost. It is used for process equipment like pressure vessels, columns, tanks, heat exchangers, shafts, blowers and fans, condenser tubing, valves, fittings, and pipe. ERTi-2 is extremely versatile for applications requiring high temperature resistance together with resistance to many chemical agents and corrosion. CP-2 is unalloyed. At service temperature 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 through 4 depending on the yield strength and allowable levels of the elements iron, carbon, nitrogen, and oxygen. ERTi-2 is good for Airframe components, cryogenic vessels, heat exchangers, CPI equipment, condenser tubing, pickling baskets.
ERTi-2 Applications
ERTi-2 may be considered in any application where formability and corrosion resistance are important, and strength requirements are moderate. Some examples of aerospace applications have included airframe skins in “warm” areas, ductwork, brackets, and galley equipment. CP Ti Grade 2 has also been widely used in marine and chemical applications such as condensers, evaporators, reaction vessels for chemical processing, tubing and tube headers in desalinization plants, and cryogenic vessels. Other uses have included items such as jigs, baskets, cathodes and starter-sheet blanks for the electroplating industry, and a variety of medical applications.
ERTi-2 Weldability
ERTi-2 can be welded using CP-Ti filler metal. Inert gas shielding techniques must be employed to prevent oxygen pickup and embrittlement in the weld area. Gas tungsten arc welding is the most common welding process for ERTi-2. Gas metal arc welding is used for thick sections. Plasma arc welding, spot welding, electron beam, laser beam, resistance welding, and diffusion welding have all been used successfully in CP-Ti welding applications.
For more technical and comprehensive information please reference Carpenter®’s Datasheet on ERTi-2
Other ERTi-2 Specifications:
| AMS 4951H CP-Ti | CPTi-2 | Commercially Pure Titanium Grade 2 | Grade 2 Titanium |
| ASME SFA 5.16 | UNS R50120 |
| Nominal Chemistry Composition (%) | ||||||||
|---|---|---|---|---|---|---|---|---|
| Ti | C | O | N | H | Fe | Y | OE | OT |
| BAL | 0.030 max | 0.08-0.16 | 0.015 max | 0.008 max | 0.120 max | 0.005 max | 0.050 max | 0.200 max |
| Mechanical Properties | ||
|---|---|---|
| Tensile Strength | 345 MPa | 50,000 psi |
| Yield Strength | 275 MPa | 40,000 psi |
| Elongation (%) | 35 | |