Malleable steel parts are forged cast iron, often used in the manufacture of pipe fittings, such as a variety of pipe joints, malleable steel parts of the main application range, such as gas supply heating, fire water supply, etc., have their practical applications, malleable steel parts have certain advantages, such as better mechanical properties, high performance, in the strength, hardness and wear resistance have shown good results in the application of malleable steel pipe is very wide.