Stainless Steel Seamless Pipes Tp321 ASTM A321/A312M Stainless Welded Steel Pipe A312 316L TP304L A321 TP304 TP316

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 9000 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. The steel has excellent forming and welding qualities and excellent toughness even at cryogenic temperatures. If you are looking for a stainless steel to provide resistance to intergranular corrosion, 304L is the normal choice as it is a more commonly used and supplied steel.

ASTM A321 TP321 Seamless Welded Pipe And Tube

Grades 321 and 347 are the basic austenitic 18/8 steel (Grade 304) stabilized by Titanium (321) or Niobium (347) additions. These grades are used because they are not sensitive to intergranular corrosion after heating within the carbide precipitation range of 425-850 °C. The 321 stainless steel pipe is the grade of choice for applications in the temperature range of up to about 900 °C, combining high strength, resistance to scaling and phase stability with resistance to subsequent aqueous corrosion.

Due to the stability of 321 stainless steel pipe, the material is known for its resistance to intergranular corrosion. This makes it suitable for applications at intermittent operating temperatures. SS 321 Seamless Pipe has a minimum tensile strength of 515 Mpa. Adding titanium to the alloy increases its strength. Alloy 321 is commonly used in engineering and chemical equipment. It has a maximum hardness of Rockwell 95 HRB.

In addition to its machinability, SS 321 steel is also resistant to atmospheric corrosion, inorganic chemicals and chlorides. Stainless steel 321 is suitable for applications involving high temperatures. SS 321 pipe is preferred in the high temperature range due to better strength and formability compared to SS 304L pipe. Additionally, it can be welded in place using standard shop fabrication procedures. Typically, it is used for functions between 800 and 1650 degrees Celsius.

Typical compositional ranges for grade 321 stainless sheets of steel are given in table 1.

Table 1. Composition ranges for 321-grade stainless steel 

Mechanical Properties

Typical mechanical properties for grade 321 stainless sheets of steel are given in table 2.

Table 2. Mechanical properties of 321-grade stainless steel 

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