ASTM A240 Type 321 Bolt, Nuts, Washers Manufacturer in India

ASTM A240 Type 321, ASTM A240 Type 321 Bolt, Nuts, ASTM A240 Bolt Manufacturer in India – Ananka Group

ASTM A240 Type 321 is a specification for stainless steel plates, sheets and strips. It’s mainly used in conditions that require high corrosion resistance and oxidation properties at elevated temperatures. Type 321 is an austenitic stainless steel alloy much like Type 304 but stabilized with titanium to stabilize it against carbide precipitation which, in turn, confers adequate performance in the high-temperature environment. It has many uses within the aerospace industry, chemical processing, and oil and gas.

ASTM A240 Type 321: Composition and Properties

ASTM A240 Type 321 stainless steel composition includes a percentage of the following; chromium: 17-19%, nickel: 9-12% and also contains titanium at a very minimal composition of 0.7%. Titanium is incorporated into the alloy composition to stabilize the alloy through binding by carbon, thus unable to form chromium carbides at grain boundaries especially during weld process or high temperature exposure. This stabilization results in resistance to intergranular corrosion.

Benefits of ASTM A240 Type 321 Stainless Steel:

Resists heat up to about 870°C (1600°F) when titanium is added. These materials retain their mechanical properties and resistance to corrosion at elevated temperatures. Thus, this alloy should be used in applications where the component will be subjected to a high temperature for significant periods.

Resistance to Sensitization: Type 321 is less sensitive to intergranular corrosion than non-stabilized stainless steels, due to the presence of titanium, which prevents the precipitation of chromium carbides and ensures long-term resistance even after welding or thermal cycles.

While its corrosion resistance is about the same as that for Type 304, Type 321 is more specifically effective in applications where exposure to elevated temperatures or harsh environments is expected, protecting from oxidation and scaling.

Good Formability and Weldability: With titanium added, Type 321 still retains typical characteristics of the austenitic stainless steels about its formability and weldability that make it easily fabricate and joined without compromising its corrosion resistance.

Common Applications:

 Aerospace components including exhaust manifold and turbine parts

Chemical processing equipment

Heat exchangers, furnace parts and expansion joints

Piping systems within the oil and gas industry

Automotive exhaust systems

The ASTM A240 Type 321 stainless steel is best suited for high-temperature applications where resistance to sensitization and intergranular corrosion is of extreme importance. It provides stability and durability to be used in challenging environments, offering reliable performance for industrial as well as aerospace applications.

ASTM A240 Type 321 Chemical Composition