Test medium for detecting phosphorus segregates in metallic material

摘要

A sheet impregnated with an aqueous solution of silver nitrate is effective to detect phosphorus segregates in a metallic material, particularly cast steel. Segregated phosphorus can be detected by etching a surface of steel to be tested, attaching test paper onto the steel surface, applying an aqueous solution of 0.1 to 80% by weight of silver nitrate to the test paper, maintaining the test paper in contact with the steel surface for a sufficient time, removing the test paper from the steel surface, and subjecting the test paper to fixing treatment.