Method for preventing cast-in steel pipe from being burnt and sintered

Abstract

The invention discloses a method for preventing a cast-in steel pipe from being burnt and sintered. In the method, fireproof coating is coated on the inner wall of the cast-in steel pipe and a filler is uniformly filled in an inner cavity during the production of cast steel, spheroidal graphite cast iron and gray iron castings, wherein the fireproof coating forms a high-temperature resistant isolating layer on the inner wall of the steel pipe. As the fireproof coasting is coated on the inner wall of the cast-in steel pipe and the simple and cheap filler is filled in the inner cavity during the production of cast steel, spheroidal graphite cast iron and gray iron castings, the problems that the steel pipe cannot be penetrated through due to burning and sintering and the like are solved, the rejection rate because the steel pipe cannot be penetrated through due to burning and sintering is 0, the production cost is greatly lowered and the material waste is reduced.

Description

technical field [0001] The invention relates to a casting method of castings, in particular to a method for preventing scalding and sintering of cast steel pipes. Background technique [0002] Casting is the process of pouring smelted metal liquid into the mold, cooling and solidifying to obtain the required shape and performance of the parts. Casting is a commonly used manufacturing method. Its advantages are: low manufacturing cost, high process flexibility, and complex shapes and large castings can be obtained. It occupies a large proportion in mechanical manufacturing, such as machine tools account for 60-80%, and automobiles account for 25%. , tractors account for 50-60%. The quality of castings directly affects the quality of products, therefore, casting plays an important role in the machinery manufacturing industry. [0003] The main process of casting includes: metal smelting, model making, pouring solidification and demoulding cleaning. The main materials for ca...

AI Technical Summary

Problems solved by technology

[0004] In the production of cast steel, ductile iron, and gray iron castings, some castings need to be cast into standard or special-shaped steel pipes for gas and oil transportation when the product is in use, but in actual production, it often occurs that the steel pipe will be scalded and sintered. Impassability and other problems lead to the scrapping of castings, causing unnecessary waste and increasing production costs