SS321 Studs is a metal rod or bar with threads on both sides. It also known as double-headed screws or studs, used to connect two parts together. General for mining machinery, bridges, cars, motorcycles, boiler steel structure, hanging tower, large span steel structure and large buildings.
We tend to use studs when the parts need to remove frequently, because the thread will be worn if install and remove often, then we need to change the studs.
Type 321 is a standard austenitic 18/8 chromium nickel alloy with the addition of Titanium making it an excellent choice in elevated temperature environments.
The titanium stabilises the material removing its susceptibility to the effects of intergranular corrosion. 321 is therefore the stainless steel material of choice for applications in working environments up to 900° C.
A drawback of Type 321 is that the titanium does not transfer well across a high temperature arc, so it is not recommended as a welding consumable.
In such instances, 347 is the preferred choice as the Niobium performs the same function as Titanium but can be still transferred across a high temperature arc. Type 347 is therefore the consumable of choice for welding Grade 321.
321 alloy application areas:
Used in anti-grain boundary corrosive requirements of high chemical, coal, oil industry, outdoor open-air machines, building materials, heat-resistant parts and heat treatment difficult parts, such as:
Oil exhaust gas combustion pipe
Engine exhaust pipe
Boiler shell, heat exchanger, heating furnace parts
Susencer parts for diesel engines
Boiler pressure vessel
6. Chemical transporters
7. Expansion joints
Spiral welded pipe for furnace and dryer
SS321 Chemical Composition:
SS321 minimum mechanical properties in the room temperature:
Tensile strength Rm N/mm²
Yield strength RP 0. 2N/mm²
Elongation A 5 %
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