Method for casting corrosion-resisting butterfly valve body

Abstract

The invention discloses a method for casting a corrosion-resisting butterfly valve body. Firstly, raw materials including pig iron 25-32%, steel scrap 25-32%, foundry returns 15-25%, rare earth iron alloy 5-8%, silicon iron 1.7-2.0%, carburant 0.2-0.24% and ferromanganese 5-10% are weighed by weigh ratio, wherein the sum of ingredients is 100%; chemical components including C2.83-3.2%, Si 1.0-1.3%, Mn 0.6-1.0%, P 0.8-1.0%, S 0.03-0.09%, Si 8-15.5%, Cr 0.27-0.33%, Sn 0.01-0.02% and Cu 0.8-1.2% are controlled; the temperature is heated to be 1400-1600 DEG C to melt the ingredients into molten metal, the content of the chemical components is detected, and then corresponding lacking metal elements are added into the molten metal to be mixed evenly to form pouring liquid; and pouring and cooling solidification are performed, and steam treatment is performed to a taken-out coagulum to obtain the corrosion-resisting butterfly valve body. The raw materials are reasonable in formula, the process is simple, produced corrosion-resisting butterfly valve body is good in performance, long in service life and high in qualified rate, the product quality is improved greatly, and the method is suitable for being popularized widely.

Description

technical field [0001] The invention relates to a casting method for a corrosion-resistant butterfly valve body, belonging to the technical field of valve casting. Background technique [0002] Butterfly valve, also known as flip valve, is a regulating valve with simple structure. It can also be used for switch control of low-pressure pipeline medium. Low consumption, small installation size, rapid switching, small driving torque, etc., are used to cut off, connect and adjust the medium in the pipeline, and have good fluid control characteristics and closing and sealing performance. At present, the corrosion-resistant butterfly valve body The casting process mainly adopts conventional casting, which is often accompanied by the disadvantages of complex process, low pass rate and short service life of the product. Contents of the invention [0003] The object of the present invention is to provide a casting method for a corrosion-resistant butterfly valve body. The composi...

AI Technical Summary

Problems solved by technology

[0002] Butterfly valve, also known as flap valve, is a regulating valve with simple structure. It can also be used for switch control of medium in low-pressure pipelines. Flow function; butterfly valve has the characteristics of simple structure, small size, light weight, low material consumption, small installation size, fast switching, small driving torque, etc. It is used to cut off, connect and adjust the medium in the pipeline, and has good fluid performance Control characteristics and closing sealing performance. At present, the casting process of corrosion-resistant butterfly valve body mainly adopts conventional casting, which is often accompanied by the disadvantages of complex process, low pass rate and short service life of the product.