309/309s Stainless Steel Plates in Hot Rolled and Cold Rolled with Surface Finish Like Mill Finish, No.1, 2B, 2D, No.4, No.8, Mirror, Brush, Hairline etc. with NACE MR O1-75, Intergranular Corrosion Test A262 Practice E, Mercury Free in Width of 1250 / 1500 / 2000 mm and Custom Size from 0.6 to 80 mm Thickness.
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.
309S (UNS S30908) 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.
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