Alloy(UNS N10276, W.Nr.2.4819) is known for its corrosion resistance in a wide range of aggressive media. The high
molybdenum content imparts resistance to localize corosion such as pitting.The low carbon minimizes carbide precipitation during welding to maintain resistance to intergranular attack in heat-affected zones of welded joints. It is
used in chemical processing, pollution control, pulp and paper production,industrial and municipal waste treatment and the
recovery of "sour" natrural gas.Application in air pollution control include stack liners, ducts,dampers,scrubbers,stack-gas,
fans and fan housings. In chemical processing, the alloy is used for componets including heat exchagers,reaction vessels,
evaporators and transfer piping.
Hastelloy C276 alloy has excellent resistance to a wide variety of chemical process environments, including strong oxidizers. such as ferric and cupric chlorides,hot contaminated media(organic and inorganic),chlorine,formic and acetic
acids,acetic anhydride, and seawater and brine solutons.It is used in flue gasdesulfurization systems because of its excellent resistance to pitting and to stress-corrosion cracking.It is also one of the few materials that withstands the
corrosive effects of wet chlorine gas, hypochlorite,and chlorine dioxide.
Corrosion properties of hastelloy C276
The alloy has the following characteristics: 1.two in oxidizing and reducing atmosphere state, for most corrosive media has excellent corrosion resistance. 2. has excellent resistance to pitting, crevice corrosion and stress corrosion. Higher Mo, Cr content of the alloy corrosion resistant to chlorine ions, W elements to further improve the corrosion resistance. Meanwhile, Hastelloy C-276 alloy is one of only a few resistant to moisture chlorine, hypochlorite and chlorine dioxide-corrosive material, high concentrations of chloride salts such as ferric chloride and copper chloride have significant corrosion resistance. Applicable to various concentrations of sulfuric acid solution, it is one of the few materials can be used in hot concentrated sulfuric acid solution.
Welding and heat treatment of hastelloy C276
C-276 alloy welding performance and common austenitic stainless steel is similar to using a welding method for welding C-276 before, we must take measures to make the corrosion resistance of the weld and heat affected zone the smallest decline, such as tungsten gas shielded arc welding (GTAW), gas metal arc welding (GMAW), submerged arc welding or some other can make the weld and heat affected zone the smallest decline in corrosion resistance welding method. But for such as oxy-acetylene welding material, it is likely to increase the weld and heat affected zone carbon or silicon content of the welding method is not suitable for use in. About welded joints in the form of choice, you can reference the successful experience of the ASME Boiler and Pressure Vessel Code for Hastelloy C-276 alloy welded joints.
Welding groove machining method is preferable, but will bring machining hardened, so at the groove machined polished before welding is necessary.Welding heat input to the adoption of appropriate speed to prevent heat cracks.In most corrosive environment, Hastelloy C-276 alloy can be welded in the form of applications. But in a very harsh environment, C-276 material and welding parts to solution heat treatment in order to obtain the best corrosion resistance.Hastelloy C-276 alloy welding can choose their own material or filler metal for welding. When such request to add certain ingredients in the weld Hastelloy C-276 alloy, like other nickel-based alloy or stainless steel, and these welds will be exposed to the corrosive environment, then, welding rod or wire used is required and base metal corrosion resistance comparable performance.Hastelloy C-276 alloy material solution heat treatment consists of two processes: (1) heating at 1040 ℃ ~ 1150 ℃; (2) within two minutes of rapid cooling to the black state (about 400 ℃), the material thus treated It has good corrosion resistance. Therefore, only the Hastelloy C-276 alloy stress-relief heat treatment is ineffective. To clean up the oil before the heat treatment of the alloy surface, which may produce all the dirt of carbon during the heat treatment.Hastelloy C-276 alloy surface during welding or heat treatment will produce oxides of Cr in the alloy decreased, affecting corrosion resistance, so its surface cleaning. You can use stainless steel wire brush or a grinding wheel, then dipped in an appropriate proportion of a mixture of nitric acid and hydrofluoric acid, and finally rinse with water
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After Processing And Before Packing
1. Chemical Compositon Inspection
3.Metallurgical Microscope Inspection.
4.Physical Property Inspection
6.Heterogeinity Of Carbides
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