ASTM A213 TP 321/321H Stainless Steel Seamless Pipes

　　ASTM A213 TP 321/321H Stainless Steel Seamless Pipes Manufacturers, Suppliers Stainless steel is often referred to as corrosion-resistant steel—it does not stain, corrode, or rust as easily as regular carbon steel. However, saying it is corrosion-resistant would be misleading. Standard carbon steel is significantly different because the chromium content limits surface corrosion, whereas carbon steel will rust when exposed to air and any moisture in the atmosphere. Stainless steel is often a popular solution due to its antioxidant properties.

　　Stainless Steel Seamless (SMLS) pipe is formed by drawing a solid billet over a piercing rod to create the hollow shell. As the manufacturing process does not include any welding, Seamless Pipes are perceived to be stronger and more reliable. Historically, seamless pipe was regarded as withstanding pressure better than other types, and was often more available than Welded Pipe.

　　Grades 321 and 347 are the basic austenitic 18/8 steel (Grade 304) stabilised 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. Grade 321 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.

　　Grade 321H is a modification of 321 with a higher carbon content, to provide improved high temperature strength.

　　A limitation with 321 is that titanium does not transfer well across a high temperature arc, so is not recommended as a welding consumable. In this case grade 347 is preferred - the niobium performs the same carbide stabilisation task but can be transferred across a welding arc. Grade 347 is therefore the standard consumable for welding 321. Grade 347 is only occasionally used as parent plate material.

　　Like other austenitic grades, 321 and 347 have excellent forming and welding characteristics, are readily brake or roll formed and have outstanding welding characteristics. Post-weld annealing is not required. They also have excellent toughness, even down to cryogenic temperatures. Grade 321 does not polish well, so is not recommended for decorative applications.

　　Grade 304L is more readily available in most product forms, and so is generally used in preference to 321 if the requirement is simply for resistance to intergranular corrosion after welding. However 304L has lower hot strength than 321 and so is not the best choice if the requirement is resistance to an operating environment over about 500°C.

ASTM A213 TP 321/321H Stainless Steel Seamless Pipes Range

　　We Supply ASTM A213 TP321H Stainless Steel Seamless Pipes in Grades in Specification ASME SA / ASTM A269, A312, A213 and along with other Grades 202, 304, 304L, 304H, 304LN, 309s, 310s, 316, 316L, 316H, 316Ti, 316LN, 317L, 321, 321H, 347, 347H, 904L, 254 SMO, 6MO, 6 MOLY, UNS S31254, etc. The grade indicates the testing methods required for a given application.

　　Hebei shengtian pipe-fitting group Co., ltd.  we carry a full inventory of ASTM A213 TP321H Stainless Steel Seamless Pipe and Supply ASTM A213 TP321H Stainless Steel Seamless Pipe austenitic chromium-nickel stainless steel pipe suitable for corrosive or high-temperature service, or both, or for general applications .

　　As a steel pipe factory providing ASTM A213 TP321H stainless steel seamless pipe, 321H stainless steel pipe, ASTM A213 TP321H stainless steel pipe, ASTM A213 321H grade stainless steel pipe, ASME SA213 TP321H stainless steel seamless pipe, 321H SS pipe, UNS S32109, etc.