Alloy 309 & 309S Stainless Steel
- Improved resistance to cyclic oxidation
- Increased resistance to sulfidation
- Better high temperature strength
- Improved resistance to intergranular corrosion
309S (UNS S30908) stainless steel is the low carbon version of the alloy. It is utilized for ease of fabrication.
309H (UNS S30909) is a high carbon modification developed for enhanced creep resistance. It most instances the grain size and carbon content of the plate can meet both the 309S and 309H requirements. When heated between 1202 – 1742°F (650 – 950°C) the alloy is subject to sigma phase precipitation. A solution annealing treatment at 2012 – 2102°F (1100 – 1150°C) will restore a degree of toughness. Alloy 309 can be easily welded and processed by standard shop fabrication practices.
|Butt Weld Fittings||1/2″ thru 12″||Sch 10, 40, 80, 160 & XXH||A403|
|Pipe Welded & Seamless||1/4″ thru 16″||Sch 10, 40, 80, 160 & XXH||A312|
|Flange & Pressure Fittings||All Descriptions||A182|