Discussion on Differences between the New and Old Edition Standard of GB/T226 “Test Method for Macrostructure and Defect of Steel by Etching”

The common macroscopic examination method for structural steel and continuous casting billet by etching was described in GB/T 226.The differences between the new edition standard and the old edition standard in 1991 were contrasted.It was found that all of the chapters had different degree of change basically in the new edition standard, including sampling, processing and corrosion, so as to apply the standard for practical work.