Great Wall Cast Steel analyzes how to cast a qualified super large rolling mill stand

Great Wall Cast Steel analyzes how to cast a qualified super large rolling mill stand

The stand is the main component of the rolling mill, and it is especially important to control its mechanical properties. However, because the archway has a large volumetric weight, there are problems such as shrinkage, shrinkage, coarse grain, and flaw detection.

In fact, as long as the analysis of large steel castings, the introduction of reasonable casting process, reasonable control of molten steel composition, determine a reasonable heat treatment process and other comprehensive measures can achieve quality requirements.

1. Casting process design

Casting process design In order to ensure the uniform quality of the two columns, the technical team should design a suitable casting process according to the casting structure, and carry out numerical simulation through casting simulation software, which can avoid shrinkage, shrinkage and crack generation. Practice has also proven that the casting process is reasonable.

2. Composition control

Alloying is an effective way to improve and improve the properties of steel. Therefore, reasonable control of the casting composition is very important to meet the mechanical properties requirements. The company uses German imported spectrometer to analyze the composition of molten steel to ensure the composition of molten steel and ensure the quality of castings.

3. Heat treatment process

Heat treatment is an effective process measure and method to improve material structure and improve mechanical properties of materials. The piece belongs to a thick and large frame structure, and the thickness is uneven. The cooling rate is slow during the casting process, and the shrinkage is inconsistent everywhere, resulting in coarse cast structure and poor mechanical properties. It is necessary to heat the structure to improve the structure and remove the stress.