Stainless Steel Seamless Pipes Tp321 ASTM A321/A312M Stainless Welded Steel Pipe A312 316L TP304L A321 ASTM A213, ASTM A269, ASME Sb677

Grades TP304H, TP309H, TP309HCb, TP310H, TP310HCb, TP310HCbN, TP316H, TP321H, TP347H, TP347HFG (fine grained) and TP348H are modifications of Grades TP304, TP309S, TP309Cb, TP310S, TP310Cb, TP316, TP321, TP347, and TP348, and are intended for high-temperature service, such as for superheaters and reheaters.

For ASTM A213 Seamless Tubes with diameters less than 1/8 in. [3.2 mm] in inside diameter or 0.015 in. [0.4 mm] in thickness，mechanical property requirements won’t apply. Tube with other dimensions may be furnished comply with other requirements.

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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