Elevated Temperature Mechanical Properties
Elevated temperature mechanical properties for stainless steels specified in BS EN 10028-7
Mechanical, (tensile), properties are specified for pressure vessel applications in BS EN 10028-7. These are minimum design values only and do not represent typical values.
Proof strength values only are specified for a small number of ferritic, martensitic and duplex grades. There is a more extensive range of data for austenitic grades, which specifies 0.2% and 1.0% proof strengths and tensile, (UTS), values.
The values are shown in N/mm2, (MPa).
Elevated temperature physical properties of stainless steels
BS EN 10088-1 gives a limited amount of data for specification purposes. Above ambient temperatures this is limited to modulus of elasticity, (Young's modulus) and coefficients of thermal expansion. The maximum temperature for which there is data is 500 deg.C.
Stress relieving heat treatments for austenitic stainless steels
Unlike martensitic steels, the austenitic stainless steels are not hardenable by heat treatment as no phase changes occur on heating or cooling.
Softening is done by heating in the 1050/ 1120 deg.C range, ideally followed by rapid cooling.
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