SS 321 is used to make Seamless Tubes because of these reasons:

No joints or welds are used in producing SS 321 tubing. Instead, steel made from a single piece is used to make them. They are more expensive than other pipes because of this. The SS 321 Seamless tube is extremely robust and long-lasting. These pipes are suitable for temperatures between 800 and 1500 °C. They are frequently utilized in exhausts, jet engines, boilers, etc. Due to the superior resistance of this grade, the 321 SS Braided Pipe is fully free of post-weld carburization or pitting. In addition, these pipes have outstanding creep resistance. 

An austenitic alloy called Grade 321 is stabilized with titanium. The stainless steel 321 pipe/tube provides excellent corrosion resistance and sterilizing qualities. Since the 304 grade was prone to intraocular corrosion in some ranges, this quality was initially created to address it. Excellent mechanical qualities can be found in stainless steel 321 tubes. These pipes can be extended by 40% and have a strength of 8027 gm/cm3 for various uses. The carbon steel 321 tube has a melting point of between 1398 and 1146 degrees Celsius, making it exceptionally robust. These tubes have a minimum tensile strength of 515Mpa and a limited yield strength of 205Mpa. Exhaust tubing made of 321 is incredibly durable and does not bend easily. These tubes feature a 217 Brignell hardness and resistance to heat and smoke.

Techniques for Welding and Annealing 321 All typical welding methods, including submerged arc, work well for welding stainless steel. The main distinction between this alloy and 304 and 304L stainless steel is the addition of titanium, which eliminates or delays carbide precipitation while welding.

SS 321 Tubes

To make a hollow tube or shell, a solid round shape of steel, known as “billets,” is heated and cast over a form like a piercing rod. This process is how seamless pipes are made. In addition to being quick and affordable, these types of pipes are renowned for being able to bear pressure more effectively than other pipe manufacturing procedures. Gas lines and pipes carrying liquids both typically employ seamless pipes.

Seamless pipes frequently come into use in high-pressure activities such as refineries, hydraulic cylinders, the hydrocarbon industry, and oil and gas infrastructure because they can resist high pressures.

Seamless pipes are produced from solid round billets rather than welding or joints like other kinds of tubing, which increases their strength and other qualities like corrosion resistance. The operating pressure of these pipes is higher than welded pipes, referred to as non-seamless pipes, and are also better at withstanding mechanical stress.

The use of seamless pipes often depends on the pipe wall thickness. To create pipes with thicker walls, higher temperatures must be used, which lowers the deformation resistance and increases deflection.

About SS 321 Seamless Steel

The production of the 321 tubes involves welding the junction in the cross-section. These pipes are extremely durable and are connected electrically. Due to its non-magnetic nature, heat rolling cannot be used to harden a 1.4541 SS 321 Smooth Tube. These tubes also function admirably at low temperatures. The walls of the SS 321 Category 40 Pipe are thin. Although they perform well in high-pressure applications, these pipes are also favored for low-pressure applications.

Uses of SS 321 seamless tubes

Equipment used in oil refineries, containers, pharmaceutical equipment, petroleum and chemical refineries, and heat exchangers for chemical processes is some common applications for stainless steel 321 tubing. A long list of sectors using SS 321H Tubing’s high characteristics includes engineering, chemical, sugar, and medicinal.

Even at cryogenic temperatures, the steel possesses good forming, welding, and toughness properties. SS 321 is usually the best option because it is a more popular seamless steel to provide resistance to corrosion.