Method for manufacturing standard test blocks used for 300M steel tempering acid etch detection

Abstract

The invention provides a method for manufacturing standard test blocks used for a 300M steel tempering acid etch detection, which solves the defect that the current process parameters fluctuate with the change of the solution concentration. The method of the invention is characterized in that the standard test blocks with seven different structural states are prepared. According to the invention, the color of seven standard test blocks which are performed acid etching are observed for judging the suitability of a tempering acid etch reagent and tank liquid concentration process parameters; as well as for comparing and judging after the components are performed acid etching. Because test blocks with different states have different structures, the colors are different after being acid etched by using same reagent and tank liquid. The completeness of surface of 300M steel components can be contrasted and inspected by the test blocks, and the verification of the suitability of the acid etch technology can be realized by the standard test blocks simultaneously. The acid etch process parameters matched with concentration of the acid etch reagent and the tank liquid can be determined. The standard test block with each state is prepared individually, so that the structural state is stable and the standard test blocks enable repeated use. The method of the invention has the advantage of simple and convenient operation. The method for manufacturing standard test blocks is used for the 300M steel tempering acid etch detection.

Description

technical field [0001] The invention relates to a method for making a test block, in particular to a method for making a standard test block for 300M steel tempered acid etching. Background technique [0002] In the prior art, 300M steel has become the preferred material for load-bearing components due to its characteristics of high strength, high transverse plasticity, excellent fatigue performance, and good stress corrosion resistance. The purpose of controlling its machining process is to ensure that the excellent performance of 300M steel can be fully reflected in the manufacture of parts. Therefore, in the application process of 300M steel materials, acid etching inspection technology needs to be used to detect and determine whether parts are qualified and scrapped. At present, there are relevant standards for tempering acid etching technology in China, such as HB7717-2002 "Grinding Burn Acid Etching Inspection of Aviation Steel Parts", the principles, equipment, reage...

AI Technical Summary

Problems solved by technology

However, in actual work, since there is a certain adjustable range in the preparation of reagents and solutions, and the concentration of the solution will change dynamically with the loss of the bath solution or natural evaporation during the application process, the process parameters will also occur accordingly. Fluctuations, resulting in duplication of work or misjudgment in the tempering acid etching detection process, thereby affecting the quality of the product

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