ASTM B861 (seamless) and B862 (welded) Grade 2 commercially pure titanium pipe coupons offer an exceptional combination of corrosion resistance, strength-to-weight ratio, and biocompatibility. Grade 2 titanium provides excellent general corrosion resistance approaching that of platinum in many environments while maintaining mechanical properties comparable to austenitic stainless steels.
Grade 2 titanium is the most commonly specified unalloyed titanium grade, containing minimum 99.2% titanium with controlled oxygen content for optimized strength and ductility. The material forms a stable, protective titanium dioxide surface film that provides inherent corrosion resistance in oxidizing, neutral, and some reducing environments.
Titanium Grade 2 resists seawater corrosion under all velocities and temperatures, chloride solutions at all concentrations below boiling, oxidizing acids including nitric acid and chromic acid, organic acids and chlorinated organic compounds, alkaline solutions, and wet chlorine gas. The material is immune to chloride-induced stress corrosion cracking and pitting corrosion that plague stainless steels. However, titanium can be attacked by hydrofluoric acid, hot concentrated reducing acids, and dry chlorine gas at elevated temperatures.
Grade 2 titanium serves shipboard seawater piping, offshore platform firewater and cooling systems, desalination plants, chemical processing involving chlorinated media, pulp and paper bleaching operations, chlor-alkali production, heat exchangers in corrosive service, and architectural applications in aggressive coastal environments.
With minimum tensile strength of 50,000 psi, yield strength of 40,000 psi, and density of 0.163 lb/in³ (approximately 57% the density of steel), titanium offers substantial weight reduction in marine and aerospace applications where payload and structural weight are critical design factors.
Titanium welding requires inert gas shielding throughout the welding process. GTAW is the predominant process using commercially pure titanium filler metal (ASTM B863 Grade 2). Argon or helium shielding protects the weld pool, with trailing gas shields protecting the cooling weld metal. Back purging is mandatory to prevent atmospheric contamination of the root pass. Any discoloration beyond light straw indicates oxygen contamination and requires removal. Accepted weld color ranges from bright silver to light straw. Blue, purple, or gray coloration indicates excessive oxygen pickup and compromised corrosion resistance. Surface preparation must remove all contamination, oils, and drawing compounds before welding.
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