Explanation

The shaped steel parts are produced by foundry process. According to the alloy element content in steel, it can be divided into non alloy, low alloy (the total amount of alloy elements is less than 5%), medium alloy (the total amount of alloy elements is 5% -10%) and high alloy (the total amount of alloy elements is more than 10%). It can be divided into ordinary cast steel, wear-resistant, corrosion-resistant, heat-resistant, nonmagnetic, foundry die steel, special purpose, etc. according to its performance and use. The shape and size of cast steel can be obtained by designing different mold as required, which is very close to the final product; However, there are metallurgical defects such as porosity and porosity, which have adverse effects on mechanical properties. Its properties are between cast iron, rolled products and forged steel. When the shape of the parts is complex, and it is not economical to directly use rolling profiles or use profiles to change forging, cast steel can be widely used. Non alloy (GB/T 11352-2009) and low alloy (GB/T 14408-2014) for engineering and structure use ZG and ZGD respectively to represent cast steel, followed by yield strength value plus tensile strength value, and in special cases, add ZG in front of the usual composition steel designation.

Classification