Network carbide rating method of wire rod for prestressed steel stranded wire

Abstract

The invention discloses a network carbide rating method of a wire rod for a prestressed steel stranded wire, which comprises the steps of: firstly preparing a test specimen: cutting off a transverse test specimen with the length being 5mm-15mm from the wire rod, and flattening, grinding and polishing the test specimen; then using alkaline sodium picrate water solution to corrode the prepared test specimen; and finally observing under an optical microscope with magnifying power being 500 times and rating according to the following rules: grade 1, including carbides without or with slight visible chain cementite which is precipitated along a grain boundary but cannot form effective measurement area; grade 2, including carbides of which the most are networked and the network area is smaller than 0.04mm<2>; grade 3, including carbides which are fully networked with network area being smaller than 0.1mm<2>; grade 4, including carbides which are fully networked with network area being smaller than 0.2mm<2>; and grade 5, including carbides which are fully networked with network area being larger than 0.2mm<2>. The invention provides a quantitative reaction network carbide rating method for the morphological characteristics of an 82B wire rod network carbide and therefore the degree of severity of the network carbides of the inspected product can be known at a glance.

Description

technical field [0001] The invention relates to the inspection field, and more specifically, relates to a method for grading network carbides of wire rods (82B wire rods) for prestressed steel strands. Background technique [0002] The current rating of 82B wire rod network carbides is a single description of the morphology of network carbides, and the results of this literal description will vary greatly due to the education level and language expression level of different inspectors. Differences, especially in the mass production process, this vague language description will cause great confusion to quality judgment and process researchers, and it is difficult to form an intuitive inner quality feeling. Contents of the invention [0003] The technical problem to be solved by the present invention is to overcome the deficiencies in existing inspections and provide an evaluation method that can quantitatively reflect network carbides, so that everyone can know the sever...

AI Technical Summary

Problems solved by technology

[0002] The current rating of 82B wire rod network carbides is a single description of the morphology of network carbides, and the results of this literal description will vary greatly due to the education level and language expression level of different inspectors. Differences, especially in the mass production process, this vague language description will cause great confusion to quality judgment and process researchers, and it is difficult to form an intuitive inner quality feeling