Duplex and Super Duplex Stainless Steel is a highly demanded material in the industrial sectors. These materials are popular due to the chemical composition of 50% ferritic and 50% austenitic stainless steel. Due to this two-phase structure Duplex & Super Duplex Steel Pipes offers excellent benefits and increased strength than other grades. These materials are differentiated based on the different parameters.
Duplex Stainless Steel
Chemical Composition: Duplex Stainless steel has a unique combination of ferritic and austenitic materials with 22% chromium, 5-6 % nickel, and 3 % molybdenum. Due to this composition, this material offers higher fatigue strength and good corrosion resistance. Due to increased yield strength, Duplex Stainless Steel is used over other stainless steels. Duplex Stainless steel has lower nickel and molybdenum content compared to Super Duplex material.
Features: Duplex Stainless Steel offers excellent resistance to pitting, crevice corrosion, erosion, and stress corrosion cracking in severe chloride-containing environments. This feature makes Duplex Stainless steel a popular choice for many applications. It offers good weldability and formability features. It also offers very good ductility and higher mechanical strength to sustain in elevated pressure and temperature conditions efficiently. It is more cost-effective than other austenitic and ferritic stainless steel materials.
Applications: The excellent yield strength makes it easy to create thinner sections of that offer weight savings. Due to this property, Duplex Stainless Steel is used in pressure vessels and structural applications. This offers excellent stress corrosion cracking resistance that makes it suitable for process plants and water tanks. Apart from this, Duplex Stainless Steel is used in many industries such as chemical equipment, heat exchanger, power generation, pharmaceutical, and petrochemical, etc.
Super Duplex Stainless Steel:
Chemical Composition: Super Duplex Stainless Steel has a chemical composition of 25% chromium, 7% nickel, and 4% molybdenum. The higher chromium and molybdenum content offers excellent resistive features and improved tensile strength.
Features: Super Duplex Stainless Steel has many features to offer such as excellent mechanical strength, weldability, easy fabrication, and cost-effectiveness. These properties make this material one of the popular choices in the industries. Super Duplex Stainless Steel has remarkable resistance to corrosion, oxidation, and erosion. Along with this, this material is resistant to pitting, stress corrosion, and crevice corrosion cracking.
Applications: Super Duplex Stainless Steel is reliable for diverse industrial sectors such as power plants, chemical industries, heat exchangers, boilers, and pressure vessels.