Summary

309s is a highly alloyed austenitic stainless steel used for its excellent oxidation resistance, high temperature strength and creep resistance. The lower nickel content of 309s improves resistance to sulphur attack at high temperatures. . 309s  is recommended for applications where sensitisation, and subsequent corrosion by high temperature gases or condensates during shutdown may pose a problem.

Typical Applications

Products details:

Chemical Composition(%): 

ASTM A240/A240M-05

Properties at Elevated Temperatures 
The values quoted are those for 309s
Short Time Elevated Temperature Tensile Stress 
 

Creep Data 
Stress to develop a creep rate of 1% in the time indicated at the temperature indicated. 
 

Creep Rupture Stress 

Maximum Recommended Service 
Temperature 
(Oxidising Conditions)

Continuous                            1100^oC 
Intermittent                           980^oC 
 

Thermal Processing 
1.    Annealing.  Heat between 1 050^oC and 1 150^oC and water quench.  This treatment ensures that all carbides are in solution. 
2.    Stress Relieving  250-400^oC for 1 hour. 
3.    Hot Working 
Initial forging and pressure                            1150-1200^oC 
Finishing temperature                                   1000^oC

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