M390 is made of steel. M390 mold steel is a high-chromium Mars pine iron corrosion-resistant steel. Its metallographic structure is a large number of chromium carbide and vanadium carbide particles, evenly distributed on a matrix of Cr>12%. Its advantages are high corrosion resistance, high wear resistance, high polishability and optical rotation. Purpose: The abrasive plastic used in the production of compact disc molds is highly corrosive and abrasive. Flexible plastic mold. The injection screw cylinder of the wafer mold in the electronics industry is lined with a check valve at the front end of the injection screw. M390 Introduction The stainless steel invented by Buhrer was patented in Britain in 1916 and mass production began. Since then, stainless steel accidentally discovered in garbage has become popular around the world. Henry Blair Leigh is also known as the "Father of Stainless Steel." During the First World War, British guns on the battlefield were always shipped back home because their chambers were worn and unusable. The Ministry of Military Production ordered Lieutenant Li to develop high-strength and wear-resistant alloy steel to study and solve the problem of artillery barrel wear. Breer and his assistants collected various types of steel and alloy steel produced at home and abroad, conducted performance experiments on various machines with different performance, and then selected more suitable steel to make guns. One day, they experimented with a domestic alloy steel containing a large amount of chromium. After the wear-resistant test, it was found that this alloy was not wear-resistant, indicating that it could not be used to make guns. So, they recorded the results of the experiment and threw the things in a corner. One day a few months later, an assistant rushed to Bugel with a piece of shining steel and said: "Sir, this is the alloy steel that Mr. Maura sent me when I was cleaning the warehouse. Do you want to experiment and see?" What special features does it have? "Great! "Brayer looked at the bright steel and said happily.