Alloy 310 (UNS S31000) is an austenitic stainless steel developed for
use in high temperature corrosion resistant applications. The alloy resists
oxidation up to 2010oF (1100oC) under mildly cyclic conditions.
Because of its high chromium and moderate nickel content, Alloy 310 is resistant to
sulfidation and can also be used in moderately carburizing atmospheres.
The more severe carburizing atmospheres of thermal process equipment usually require
nickel alloys such as 330 (UNS N08330). Alloy 310 can be utilized in slightly
oxidizing, nitriding, cementing and thermal cycling applications, albeit, the
maximum service temperature must be reduced. Alloy 310 also finds usage in cryogenic
applications with low magnetic permeability and toughness down to -450oF (-268oC).
When heated between 1202 – 1742oF (650 – 950oC) the alloy is subject to sigma phase
precipitation. A solution annealing treatment at 2012 – 2102oF (1100 – 1150oC) will
restore a degree of toughness.
310S (UNS S31008) is the low carbon version of the alloy. It is utilized for ease of
fabrication. 310H (UNS S31009) is a high carbon modification developed for enhanced
creep resistance. In most instances the grain size and carbon content of the plate
can meet both the 310S and 310H requirements.
Alloy 310 can be easily welded and processed by standard shop fabrication practices.
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