Composition testing of composite steel plates
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In one project, due to the high corrosivity of the medium, composite steel plates were used; these included those made of 316L as well as those made of 825 nickel-based alloy. The owner’s documents specify a requirement for the testing of composite panels: the ferrite content in the composite panel at a distance of 1.5 mm from its composite surface should be between 3% and 8%. I checked ASME VIII and ASME II, but couldn’t find any relevant requirements. Dear friends from Sichuan, please discuss the reasons or origins to clarify this issue. Thank you all. Please also explain the relevant requirements in domestic standards.
Appropriate amounts of ferrite can increase the strength and crack resistance of stainless steel.