Stainless steel duplex stainless steels are achieved with an overall lower alloy content than similar-performing super-austenitic grades, making their use cost-effective for many applications. Duplex grades are characterized into groups based on their alloy content and corrosion resistance. Precipitation hardening stainless steels have corrosion resistance comparable to austenitic varieties, but can be precipitation hardened to even higher strengths than the other martensitic grades. The most common, 17-4PH, uses about 17% chromium and 4% nickel. The designation "CRES" is used in various industries to refer to corrosion-resistant steel. Most mentions of CRES refer to stainless steel, although the correspondence is not absolute, because
Corrugated stainless steel tubing Fire Protection Association) 54, 2012 Edition (National Fuel Gas Code), Section 7.13.2, "CSST". Corrugated stainless steel tubing Corrugated stainless steel tubing (CSST) is tubing made of stainless steel with corrugation on the inside or outside. One type is stainless steel tubing be formed with corrugated shape on outside surface. Make it higher efficiency of heat transfer, can be used to connect the form of tube soft and flexible, with good defensive displacement and vibration and noise reduction, mainly used on heat ex-changers. The other type is a type of conduit used for fuel gas distribution in buildings. It has a