Large steel castings are mostly the main bearing parts and supports in major technical equipment. The castings have huge size, complex shape and great difference in section thickness. This kind of casting is often in high temperature and high pressure working state, and its performance and quality requirements are...
The manufacturing industry of large steel castings is the basic industry of national equipment manufacturing, and its development level is an important symbol to measure a country’s comprehensive national strength. Large steel castings are widely used in power station, petrochemical, metallurgy, shipbuilding and other equipment and equipment manufacturing industries,...
China’s steel casting parts are indispensable products for China’s equipment manufacturing, the basis of national equipment manufacturing, and occupy a very important position in the machinery manufacturing industry. The quality and development level of China’s steel casting parts is one of the important symbols to measure a country’s comprehensive...
China’s steel casting parts manufacturing industry is the basic industry of national equipment manufacturing, especially the manufacturing of large Chinese steel casting parts. Its development level is an important symbol to measure a country’s comprehensive national strength. Chinese steel casting parts are mainly divided into three categories: carbon steel,...
There are more than 30 large-scale casting production enterprises in China, most of which are large and medium-sized state-owned enterprises. At present, only a few manufacturers such as the first heavy and the second heavy can produce Chinese steel castings of more than 200 t. The products of the...
In the late 1920s, Robertson first discovered the medium temperature transformation product later named bainite in steel. Later, the researchers further found the microstructure of upper bainite, lower bainite, granular bainite, carbide free bainite, columnar bainite, abnormal bainite, massive bainite, low-carbon and low-alloy bainite and quasi bainite, forming a...
The tempering process is the quenching and tempering step after the previous heat treatment. Although the martensite in the structure after quenching is very “tough”, it is all due to the dislocation distortion formed by the supersaturation of carbides. Such a structure has internal stress and is unstable. In...
Combined with the performance requirements and development direction of crusher lining material, a new bainite Martian multiphase wear-resistant cast steel with high strength, high hardness and qualified toughness is designed. The microstructure evolution law and performance regulation method during heat treatment are studied. By putting forward a multi-dimensional wear...
As a big foundry country, the development level of China’s foundry industry is constantly improving. However, the problem of casting cleaning has always been a big problem affecting the development of foundry industry. Due to the low degree of automation in the cleaning process, it is difficult to achieve...
The typical specification characteristics of section steel universal edging roll and special-shaped steel s-roll products are that the roll neck at the operation end is slender. Because of the roll body processing pass, the semi steel material is generally selected. Affected by the semi steel material, the solidification and...