Sandvik introduces Sanicro 60 (commonly known as Alloy 625) in hydraulic and instrumentation (H&I) tubing and heat exchanger form. The high strength, austenitic nickel-chromium alloy Sanicro 60 (UNS N06625) exhibits resistance to pitting corrosion and intergranular corrosion, and is reportedly virtually immune to stress corrosion cracking (SCC) in chloride containing environments.
Suitable for use in chemical processing, power generation and high temperature aerospace applications, the material is available in seamless pipe and also as H&I tubing, heat exchanger tubes and high temperature tubes. It has good corrosion resistance in severe oxidizing and non oxidizing acids including hydrochloric, nitric and phosphoric, as well as in high temperature applications. Sanicro 60 has a wide operating temperature range from -196°C to 815°C (-321°F to 1500°F).
The grade’s low carbon content combined with high nickel, chromium, molybdenum and nitrogen levels provides it with resistance to corrosion in chloride containing environments including seawater and hot geothermal fluids. It exhibits a Pitting Resistance Equivalent number of PRE>48, which is a measure of the relative pitting corrosion resistance of the material in chloride-containing environments.
Sanicro 60 seamless nickel-chromium alloy tube is supplied bright annealed in the outside diameter range 6 – 42 mm (0.25 in – 1.625 in) and wall thickness 0.89 – 5.00 mm (0.035 in – 0.197 in). H&I tubing is available in straight lengths and coils, supplied annealed (Grade 1) and solution annealed (Grade 2). The material grade has excellent fabrication properties and can be welded using standard austenitic stainless steel welding processes, according to the company. Post weld treatment is not necessary as it is resistant to intergranular corrosion even after welding.