Corrosion Resistant Pipe Material for Power Generation Applications

Ideal for use in power generation applications, Sanicro™ 60 (commonly known as Alloy 625) from Sandvik Materials Technology (Clarks Summit, PA) is a corrosion resistant material grade offered in hydraulic and instrumentation (H&I) tubing and heat exchanger forms for considerable operational benefits, particularly for users installing equipment in harsh environments. The high strength, austenitic nickel-chromium alloy Sanicro 60 (UNS N06625) exhibits very good resistance to pitting corrosion and intergranular corrosion, and is virtually immune to stress corrosion cracking (SCC) in chloride containing environments. The material is available in seamless pipe and also as H&I tubing, heat exchanger tubes and high temperature tubes. It has extremely 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 deg C to 815 deg C (-321 deg F to 1,500 deg F).

The grade’s low carbon content, combined with high nickel, chromium, molybdenum and nitrogen levels, provides it with an outstanding resistance to corrosion in chloride containing environments, including seawater and hot geothermal fluids. This is reflected by the high 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 of 6 mm to 42 mm (0.25 in to 1.625 in) and wall thickness of 0.89 mm to 5.00 mm (0.035 in to 0.197 in). H&I tubing is available in straight lengths and coils, supplied annealed (Grade 1) and solution annealed (Grade 2). Stock will be available for most common sizes. The material grade has excellent fabrication properties and can be welded using standard austenitic stainless steel welding processes. Post weld treatment is not necessary as it is resistant to intergranular corrosion even after welding.

This material enhances the company’s position as a trusted ‘one-stop-shop’ that can help fabricators meet a wide range of corrosion resistant material requirements in order to help them satisfy optimal materials performance and project value.

Sandvik Materials Technology, 982 Griffin Pond Rd, Clarks Summit, PA 18411, 570-585-7500, www.materials.sandvik/en, www.smt.sandvik.com.