Adhering to H Grade Requirements and Alternatives to Consider

Special considerations must be taken into account when operating temperatures exceed 1000°F [540°C]. In these instances, ASTM A240 specifies the use of “H grade” alloys (i.e. 304H, 316H, 321H) for ASME applications. H grades have a higher carbon content than the standard and L grades of their corresponding alloys which ensures increased strength at elevated temperatures. They must also have a grain size of ASTM No. 7 or something even more coarse. There are alternatives to H grade, namely Inconel 625 that is better suited for higher temperatures.

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