Stainless Steel 321H Nuts are made of stabilized austenitic stainless steel that is identical to SS 304 but has at least five times as much titanium as carbon. Stainless Steel 321H Nuts Excellent resistance to intergranular corrosion after exposure to temperatures in the chromium carbide precipitation range of 800 to 1500 Degrees F is the primary benefit of stainless steel 321H nuts (427 to 816 Degrees C). Nuts made of stainless steel 321H are stabilized to prevent intergranular corrosion in the weld heat-affected zones and are resistant to polythionic acid stress corrosion cracking. Aircraft exhaust manifolds, expansion joints, bellows, furnace parts, and other items frequently employ stainless steel 321H nuts.
A common alloy used in applications where parts are heated to temperatures within the range of carbide precipitation (800°F to 1500°F) and are exposed to corrosive environments is stainless steel 321H nuts. Stainless Steel 321H Nuts are austenitic stainless steel that has been stabilized with titanium and is renowned for its all-around resistance to corrosion. In Stainless Steel 321H Nuts, the chromium remains in solution to preserve full corrosion resistance while the carbon preferentially combines with the titanium to generate the harmless compound titanium carbide. Aircraft exhaust stacks and manifolds, as well as parts for jet engines, frequently use stainless steel 321H nuts.
Application Of Stainless Steel 321H Nuts
- Businesses that drill for oil offshore
- Power Production
- Petrochemicals
- Processing Gas
- Chemical Specialties
- Pharmaceuticals
- pharmaceutical apparatus
- Chemical Resources
- Maritime Equipment
- Exchangers of heat
- Condensers
- Industry of Paper and Pulp
Corrosion Protection
Similar to 304, stainless Steel 321H Nuts exhibit good all-around corrosion resistance. It was developed for usage in the 1800–1500 °F (416–816 °C) chromium carbide precipitation range, where unstabilized alloys, such as 304, are vulnerable to intergranular assault. The alloy can be used in pure phosphoric acid at low temperatures, most diluted organic acids at moderate temperatures, up to 10% diluted solutions at high temperatures, and most diluted organic acids. In hydrocarbon service, Stainless Steel 321H Nuts resist polythionic acid stress corrosion cracking. At mild temperatures, it can also be utilized in fluoride- or chloride-free caustic solutions. Even at low concentrations, Stainless Steel 321H Nuts do not function well in sulfuric acid service or chloride solutions.
Machining
The same hard, stringy chips will be produced by 304 stainless steel as by Stainless Steel 321H Nuts. Slow speeds and heavy feeds will reduce this alloy's tendency to work harden.
Techniques for Welding & Heat treated
Quick welding of Stainless Steel 321H Nuts is possible with all popular methods, including submerged arc. Most typically, AWS E/ER 347 or E/ER 321 are mentioned as suitable weld fillers. The main distinction between this alloy and 304 and 304L stainless steel is the addition of titanium, which eliminates or delays carbide precipitation during welding.
annealing at air-cooled temperatures of 1800–2000°F (928–1093°C). Maximum ductility will be obtained using this procedure. See the comment on settled anneal under corrosion for the highest level of corrosion resistance. Heat treatment is not used to harden this stainless steel. Cold reduction is the only way to get high attributes.
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