309S Stainless Steel Seamless Pipe - We are one of the leading exporter, manufacturers and Suppliers in all Stainless Steel Seamless & ERW Pipes of Grades 304, 304L, 316, 316L, 321, 309, 310, 316 Ti, Duplex and also Hastealloy Pipes.

309S Pipe are austenitic chromium-nickel stainless steel that provide excellent corrosion resistance and heat resistance plus good strength at room elevate temperatures. Type 309S is identical to type 309 except for a lower carbon content that minimizes carbide precipitation and improved weld ability. They are essentially non-magnetic as annealed and become slightly magnetic when cold worked.

309 is a highly alloyed austenitic stainless steel used for its excellent oxidation resistance, high temperature strength and creep resistance.

The lower nickel content of 309 improves resistance to sulphur attack at high temperatures. It is tough and ductile, and can be readily fabricated and machined. 309S is the low-carbon version of 309, and is recommended for applications where sensitization, and subsequent corrosion by high temperature gases or condensates during shutdown may pose a problem. 309 is manufactured to ASTM A 167 and 309S to ASTM A240 specifications.

Typical Applications
309 / 309S is used exclusively for its high temperature oxidation resistance. It is common for 309, 310 and 321 to be used in the same piece of equipment in the various temperature regions. 
Chemical Composition (ASTM A240) 
 

Typical Properties in the Annealed Condition 
The properties quoted in this publication are typical of mill production and unless indicated should not be regarded as guaranteed minimum values for specification purposes. 
 

1. Mechanical Properties at Room Temperature