The development of heat treatment technology in our country is similar to that of other technologies. Traditional heat treatment technology has gone through a process from its infancy, establishment, development, peak to decline, and then the introduction, digestion and development of modern technology. Material heat treatment has a long history in China. Compared with other regions of the world, the development of heat treatment technology in ancient China had distinct regional characteristics. In some aspects, China's heat treatment technology lagged behind that of other places

The heating temperature of heat treatment equipment varies with the metal material being treated and the purpose of heat treatment, but it is generally heated above the phase transformation temperature to obtain a high-temperature structure. Normalizing, also known as normalizing or normalizing, aims to improve the abnormal structure produced in the previous process through recrystallization and homogenization of the structure, thereby enhancing its mechanical and technological properties. Normalizing can be used as a pre-heat treatment device or as a heat treatment device. For structural steel of machined parts, normalizing is mostly used as a preparatory heat treatment equipment to prepare the microstructure for subsequent cutting processing and final heat treatment equipment. For low-carbon and low-alloy steel plates, normalizing is always used as the final heat treatment equipment to endow the steel plates with the required microstructure, thereby enabling them to possess the required mechanical and technological properties.

   The technological transformation that emerged in large state-owned enterprises and a large number of heat treatment processing enterprises, the huge demand for molds of light industrial and electrical products in coastal cities in East China and South China, and the external cooperation in the processing of parts for emerging manufacturing industries such as aviation have led to a wave of equipment renewal mainly involving the purchase of vacuum heat treatment equipment and sealed multi-purpose furnace production lines. The heat treatment of gasoline engines, diesel engines, reducer parts and basic components in industries such as automobiles, railways, shipbuilding, wind power, weapons, drilling and mining has basically achieved the update of heat treatment equipment mainly including pusher furnaces, roller furnaces, chain plate furnaces, mesh belt furnaces, sealed multi-purpose furnaces, transistor induction power supplies and automatic quenching machines. The upsurge of enterprise technological transformation and equipment upgrading has led to a very prosperous scene in the heat treatment equipment market. The equipment renewal rate of key enterprises has reached over 70%.

   The reliability of heat treatment equipment and processes depends on the reliability of mechanical actions, electrical components, instruments and meters, sensors, and the entire system. This issue has long been a bottleneck hindering the development of heat treatment technology and equipment in our country. Nowadays, control components and their control systems have achieved significant development. Market supply and technical services have become increasingly convenient. High-quality foreign products can be purchased domestically, and domestic products have also made considerable progress. Users can choose the grade of products based on their actual needs. Referring to the periodization of ancient China, it can be considered that in the ancient times, the heat treatment in our country had already begun to sprout, and in the ancient times, the traditional heat treatment technology in our country began to be initially established. By the Middle Ages, the traditional heat treatment technology in our country had further developed. In ancient times, traditional heat treatment technology in China reached its peak. In modern times, traditional heat treatment technology in China gradually declined, while modern technology began to be established and developed.