Boron-containing high-chromium abrasion-proof cast iron and preparation method thereof

Abstract

The invention relates to boracic high chromium wear resistant cast iron and a preparation method thereof, belonging to the wear resistant metal material technical field. The prior boracic high chromium cast iron has poor toughness and high cost. The cast iron of the invention comprises the following compositions in percentage by weight (wt percent): 2.5 to 3.5 percent of carbon, 15 to 28 percent of chromium, 0.5 to 1.2 percent of silicon, 0.5 to 1.2 percent of manganese, 0.15 to 0.3 percent of boron, 0.008 to 0.03 percent of calcium, 0.03 to 0.08 percent of barium, 0.02 to 0.05 percent of strontium, 0.03 to 0.08 percent of aluminum, 0.20 to 0.5 percent of titanium, 0.02 to 0.06 percent of lanthanum, 0.02 to 0.06 percent of cerium, less than 0.04 percent of sulfur, less than 0.05 percent of phosphor, the balance being iron; the content of lanthanum and cerium is more than or equal to 0.05 percent and less than or equal to 0.1 percent; the content of chromium or carbon is more than or equal to 6 percent and less than or equal to 8 percent. In the invention, the temperature of cast iron is kept between 980 DEG C and 1050 DEG C for 4h to 6h, then kept between 250 DEG C and 500 DEG C for 8h to 10h, thereby obtaining the cast iron. The boracic high chromium wear resistant cast iron has the advantages of high intensity and rigidity, good toughness and wear resistance, low production cost, etc.

Description

technical field [0001] The invention belongs to the technical field of wear-resistant metal materials, and in particular relates to a boron-containing high-chromium wear-resistant cast iron and a preparation method thereof. Background technique [0002] With the development of science and technology, the conservation of materials and energy is becoming increasingly important. Wear is an important reason for reducing the efficiency, accuracy and even scrapping of machines and tools, causing material loss and energy consumption, and it is also one of the three main failure modes (wear, corrosion and fracture) of mechanical parts. Since humans use machines to replace manual labor, how to prolong the service life of machines and reduce the loss of parts has always been one of the issues that people care about. For this reason, many people have carried out long-term exploration and research. Statistics show that: about 75% to 80% of the failed mechanical parts are metal wear, an...

AI Technical Summary

Problems solved by technology

[0008] Although boron-containing high-chromium cast iron has good wear resistance, the addition of boron will increase the number of carbides, which will lead to a decrease in the toughness of high-chromium cast iron. Boron-containing high-chromium cast iron has not been widely promoted and applied.

Therefore, most of the high-chromium cast iron products at home and abroad still need to add expensive alloying elements such as molybdenum and nickel. The production cost of high-chromium cast iron is generally high, and the efficiency of production enterprises is low.

Images