The chemical composition of nodular graphite casting not only directly affects the mechanical properties of nodular graphite casting, but also affects the process properties such as fluidity and shrinkage. For ferritic nodular iron castings with high requirements, the principle of “high carbon, low silicon, low manganese, low sulfur, low...
The important roll part of an equipment, which was originally a welded part, is now changed into a ductile iron part for trial production. According to the customer’s requirements, the material shall comply with DIN en1563:2012-3 casting – ductile iron, brand en-gjs-400-18u-rt, and the size of cast test block...
Figure 1 is the physical drawing of large ductile iron castings. 1. Inspection of attached cast test block Figure 2 shows the cutting and sampling diagram of cast attached test block. The test block cutting is carried out in strict accordance with the cutting steps of cast attached test...
1. Selection of raw materials High quality raw materials are required for the production of as Cast High Toughness Nodular Cast iron. Generally, high-purity pig iron with low manganese, low phosphorus and low sulfur shall be selected. In particular, the content of impurity elements such as Ti, V, Cr,...
Since ductile iron castings are prone to crack defects during cold welding, in order to ensure that all relevant properties meet the requirements before formal welding of ductile iron castings and ensure the reliability in the process of use, the welding process summarized is certified and controlled by consulting...
The structure of nodular cast iron end cover casting for train engine is shown in the figure. The material brand is QT500-7. The casting structure is complex and the casting is difficult. It has high requirements for the quality of sand core and process control in the casting process....
1. Cause analysis The modified ductile iron casting process is drawn into a three-dimensional diagram by 3D software, and then the STL format is exported and input into the magma simulation software for temperature field and solidification feeding simulation analysis. The finite difference method is used for grid division,...
The heavy truck rear axle leaf spring support is the key component connecting the leaf spring and the frame. It supports the leaf spring and transmits the force from the leaf spring to the frame. Its structural strength directly affects the driving safety of the vehicle. Therefore, the ductile...
Nodular cast iron solidifies in “paste”. Compared with gray cast iron, eutectic solidification time is long, the number of eutectic clusters is large, and the solidification expansion pressure is large. These solidification characteristics are the fundamental reason for shrinkage porosity. The formation of shrinkage porosity of nodular iron castings...
The operation environment of wind turbine is relatively bad, and the supporting large parts should be used for a long time under wind load, impact, low temperature and other working conditions. Therefore, they need to have the advantages of good mechanical properties, low temperature impact resistance, good shock absorption...