C55E spring steel spheroidizing annealing etchant solution and preparation method and application method of solution

Abstract

The invention relates to a C55E spring steel spheroidizing annealing etchant solution and a preparation method and an application method of the solution. Raw materials comprise 3-6 ml of a picric acidsaturated aqueous solution, 4-7 ml of concentrated nitric acid and 90-100 ml of anhydrous ethanol. The etchant solution is applied to spring steel and retention time is 2-4 s; and then, the surface of the sample is washed with clear water and then wiped with alcohol and blown dry so as to etch crystal boundary of the spring steel. The crystal boundary of the spheroidized structure of the C55E spring steel can be clearly etched so as to obtain a complete metallographic structure. In addition, by the use of the metallographic etching reagent, etching time is short, and etching step is simple.

Description

technical field [0001] The invention relates to a corrosion solution, in particular to a C55E spring steel spheroidizing annealing corrosion solution, a preparation method and a use method of the solution. Background technique [0002] C55E carbon spring steel is widely used in automotive interior clips, automotive timing chains, thrust bearing gaskets and other fields due to its excellent mechanical properties, hardenability and fatigue resistance. In order to be suitable for the precision stamping process and obtain a good blanking section, it is required to perform spheroidizing annealing on the cold-rolled strip steel, and at the same time require the material to have specific mechanical properties. Since the spheroidization rate and the size of cementite have a great influence on the subsequent quenching treatment, the current evaluation of the spheroidizing annealing microstructure of the material mainly focuses on the spheroidization rate and the size of cementite, wh...

AI Technical Summary

Problems solved by technology

[0003] The current corrosion solution cannot clearly and completely corrode the grain boundaries of C55E carbon spring steel, that is, the quantitative data of the grain size cannot be obtained, which makes it impossible for cold-rolled strip manufacturers to optimize cold-rolled and annealed production through a complete metallographic structure process, adjust product performance

At the same time, this also has an obvious hindering effect on enterprises to rationally regulate production resources to improve production efficiency, guide customers' quenching and tempering processes, and later develop new applications of C55E materials.

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