Duplex Steel UNS S31803 is a ferrite-austenite duplex stainless steel alloy composed of chromium, nickel and molybdenum. The material offers a range of advantages such as excellent corrosion resistance, high strength and toughness, good weldability and formability, low thermal expansion and cost savings compared to other stainless steel grades. Its chemical composition generally comprises around 22% Chromium (Cr) between 18 - 21%, 3% Molybdenum (Mo) between 2.5 - 3.5%, 4.5 – 6.5% Nickel (Ni) and other economic elements like manganese, nitrogen and iron in varying proportions that provide superior performance to the electrodes used for various industrial applications.
Due to their outstanding properties, duplex S31803 electrodes are highly demanded within the welding industry. This alloy is austenitic-ferritic stainless steel with high nickel and molybdenum components that give it a high corrosion resistance and strength over a wide temperature range. In addition to this, these electrodes offer exceptional toughness throughout their life cycle. The mechanical properties remain constant in aqueous environments containing chloride and sulfuric acids, making s31803 duplex electrodes ideal for chemical processing plants, pulp and paper mills, and food processing industries. Due to their durability, they have also become especially popular among motorboat building applications, such as propeller shafts, trim tabs and struts. With consistent performance in aggressive exposure conditions and low service temperatures down to cryogenic levels, UNS 31803 Duplex Steel Electrodes are among the most helpful welding materials available.
Duplex stainless steel UNS S31803 electrodes are equivalent to the following materials:
These materials are all variations of duplex stainless steel UNS S31803 and can be used interchangeably in many applications.
Duplex stainless steel UNS S31803 electrodes are typically manufactured to meet specific industry standards, such as ASTM or ASME. Some common specifications for duplex stainless steel UNS S31803 electrodes include:
These specifications provide guidelines for the chemical composition, mechanical properties, and other characteristics of duplex stainless steel UNS S31803 electrodes.
Duplex stainless steel UNS S31803 electrodes can be welded using a variety of methods, including shielded metal arc welding (SMAW), gas tungsten arc welding (GTAW), and flux-cored arc welding (FCAW). When welding these electrodes, it's important to follow proper guidelines to ensure the weld's integrity and prevent defects. Some general guidelines for welding duplex stainless steel UNS S31803 electrodes include the following:
Preheat the electrodes: Preheating the electrodes before welding can help reduce the risk of cracking and improve the weld's overall quality.
Use a low-hydrogen welding process: A low-hydrogen welding process can help prevent hydrogen-induced cracking in the weld.
Use a matching filler metal: Using a filler metal that matches the electrodes' chemical composition can help ensure good weldability and improve the weld's overall strength.
Use appropriate welding parameters: It's important to use the appropriate parameters (such as current, voltage, and travel speed) to ensure a good-quality weld.
It's also important to properly prepare the electrodes and the joint before welding and follow proper safety guidelines. If you need to become more familiar with the welding process, it's recommended to seek guidance from a qualified professional.
It varies, but generally it is around INR 250/Kg to INR 300/Kg
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