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Our 309 Stainless Steel Tool Wrap is the ideal solution for heat treating tooling.  Just wrap the tooling with the edges crimped to form an envelope.  This creates an air tight package that will prevent the loss of surface carbon.  Don’t let your tooling become scaled or damaged.  Protect your investment while eliminating charcoal and sawdust box packaging our 309 Tool Wrap. Contact us today for a quote or visit our pricing page for stock inventory items.


General Properties


Alloy 309 (UNS S30900) is an austenitic stainless steel developed for use in high temperature corrosion resistant applications.  The alloy resists oxidation up to 1900°F under non-cyclic conditions.  Frequent thermal cycling reduces oxidation resistance to approximately 1850°F.


Because of its high chromium and low nickel content, Alloy 309 can be utilized in sulfur containing atmosphere up to 1832°F.  The alloy is not recommended for use in highly carburizing atmospheres since it exhibits only moderate resistance to carbon absorption.  Alloy 309 can be utilized in slightly oxidizing, nitriding, cementing and thermal cycling applications although the maximum service temperature must be reduced.


When heated between 1200-1742°F the alloy is subject to sigma phase precipitation.  A solution annealing treatment at 2012 – 2102°F will restore a degree of toughness.


Element 309
Chromium 12.0 min-15.0 max
Nickel 12.0 min – 15.0 max
Carbon 0.20
Manganese 2.00
Phosphorous 0.045
Sulfur 0.030
Silicon 0.75
Iron Balance