Product details:
It is well known that haardi b-2 alloy has excellent corrosion resistance in various reducing media, and can withstand the corrosion of hydrochloric acid at any temperature and concentration under normal pressure. It has excellent corrosion resistance in non-oxidizing sulfuric acid with medium concentration, various concentrations of phosphoric acid, high temperature acetic acid, formic acid and other organic acids, bromic acid and hydrogen chloride gas. Therefore, haskell b-2 alloys are commonly used in a variety of harsh petroleum and chemical processes, such as hydrochloric acid distillation, concentration; In the process of alkylation of ethylbenzene and synthesis of acetic acid by low pressure carbonyl.
However, it has been found in the industrial application of harbor-b-2 alloy for many years:
(1) there are two sensitized zones of harris-b-2 alloy that have a considerable influence on the anti-intercrystalline corrosion performance: the high temperature zone of 1200~1300鈩?and the middle temperature zone of 550~900鈩?
(2) due to dendrite segregation, intermetallic phase and carbide precipitate along grain boundary in weld metal and heat affected zone of harbor-b-2 alloy, making it highly sensitive to intercrystalline corrosion.
(3) the thermal stability of haskell B-2 alloy is poor at medium temperature. The b-2 alloy is sensitive to changes in the beta phase, or Ni4Mo phase, an ordered intermetallic compound, when the iron content falls below 2%. When the alloy stays at 650~750鈩?for a slightly longer time, the beta phase is instantaneous. The presence of beta phase reduces the toughness of hamelite b-2 alloy, making it sensitive to stress corrosion, and even causes the cracking of hamelite b-2 alloy during raw material production (such as hot rolling), equipment manufacturing (such as the integral heat treatment after welding of hamelite b-2 alloy equipment) and service environment. At present, the standard test method for the resistance to intercrystalline corrosion of hasbraun b-2 alloy designated by China and other countries in the world is boiling hydrochloric acid method at ordinary pressure, and the evaluation method is weight loss method. The intercrystalline corrosion tendency of hasbraun b-2 alloys is not sensitive to boiling hydrochloric acid test because it is resistant to hydrochloric acid corrosion. Domestic scientific research institutions have studied harbor-b-2 alloy by high-temperature hydrochloric acid method and found that the corrosion resistance of harbor-b-2 alloy depends not only on its chemical composition, but also on its control process of thermal processing. At this point, the intergranular corrosion resistance of the b-2 alloy is significantly reduced. The grain boundary erosion depth of the coarse-grained plate is approximately twice that of the normal plate in the HCL test
Features:
鈼?control the minimum content of iron and chromium to prevent the formation of beta phase Ni4Mo
鈼?excellent corrosion resistance to reducing environment
鈼?excellent resistance to medium concentration sulfuric acid and many non-oxidizing acids
鈼?good resistance to chloride ion reduction stress corrosion cracking (SCC)
鈼?excellent resistance to various organic acidsHastelloy suppliers
website:http://www.hydtitaniumalloy.com/nickel-and-alloy-material/hastelloy/