Solution and measurement method for determination of austenite grain size in steel

摘要

The present invention relates to a solution for measuring the austenite grain size of steel used for the crystal grains of steel and cast iron products, particularly for the development of old austenite grains, and a method for the same, which can be applied to the test of parts and materials surface hardened by heat treatment such as high-Technology.;The solution for measuring the austenite crystallinity of steel of the present invention is composed of 100-120 ml of distilled water, 3-5 g of blood, 3-5 g of surfactant, and 0.4-1.0 ml of hydrochloric acid.;The method for measuring the old austenite grain size of steel according to the present invention comprises the steps of heating and maintaining a solution composed of 100-120 ml of water, 4-5 g of picric acid, 4-5 g of a surfactant and 0.4-1.0 ml of hydrochloric acid at 60-90C , Immersing the test specimen in the solution, holding the specimen for 40 to 60 seconds, removing the test specimen from the solution, washing and drying, and then measuring.