How do the properties of duplex stainless steels affect wall thickness, thermal expansion, and heat transfer in comparison to austenitic stainless steels?
Although it is generally correct to say that the yield strengths of the duplex stainless steels are twice that of the common austenitic stainless steels, that relationship does not imply that the thickness of the duplex stainless steel will be simply half that of the austenitic stainless steel in the same design. The higher strength of the duplex grades is reflected in higher allowable design stresses in the ASME Code. Depending on the shape of the construction, it is possible to reduce significantly the thickness of the material required when using duplex stainless steel, an opportunity for cost savings. The thermal expansion of a duplex stainless steel is intermediate to that of carbon steel and austenitic stainless steels. This difference can be an advantage in structure with cyclic heating because there is less necessity to accommodate the large expansions associated with the austenitic materials. On the other hand, using duplex stainless steel within a construction of austenitic s
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