GNEE STEEL is a professional steel supplier.GNEE's factory covers an area of more than 20,000 square meters, which shows that the company has a considerable production scale. The superior geographical environment and convenient transportation conditions help products quickly enter the international market.
Improvement of heat treatment equipment for medium-thick wear-resistant plates
Medium-thick wear-resistant plate is a high-end product among steel materials. Improving the heat treatment equipment of medium-thick wear-resistant plate is of great significance to achieve high quality, high efficiency and low cost of special steel production. In recent years, a series of new technologies have been developed at home and abroad in the heat treatment of medium-thick wear-resistant plates.
1. Improve the furnace roller
The maximum solution temperature of a high-temperature solution roller hearth furnace can reach 1200°C, and its rollers must have the characteristics of strong high-temperature bearing capacity. Traditionally, water-cooled furnace rollers with heat-resistant alloy jackets are used. However, heat-resistant alloy furnace rollers have shortcomings such as high cost, easy nodulation on the roller surface, and large heat loss. Using refractory asbestos fiber furnace rollers instead of heat-resistant alloy furnace rollers can effectively solve the above problems. Asbestos fiber furnace roller has good high temperature resistance, it does not bond with the oxide scale, and has certain load-bearing operation performance after being pressed. It can effectively prevent pitting defects of the wear-resistant plate caused by nodulation, and at the same time, it can reduce heat loss. It is a very important technological innovation.
2. Improve the sealing and heat preservation of the furnace shell
The sealing and thermal insulation of the furnace body are very important aspects in the design of the furnace, which directly affect the uniformity of temperature in the furnace, fuel consumption and the heat treatment quality of medium-thick wear-resistant plates. The following measures can be adopted: install two soft sealing curtains in the doorways and doorways of the feed end and discharge end, pneumatically press the furnace door, tightly weld the furnace shell, and use high-quality refractory materials, refractory fiber modules and thermal insulation materials.
3. Improve combustion device
In recent years, high-efficiency and high-speed self-preheating pulse burners have been used in high-temperature solid solution furnaces, and new digital pulse combustion control technologies have also been adopted. The high-speed pulse hot air flow ejected from the burner strengthens the gas circulation in the furnace and strengthens the convective heat transfer in the furnace, effectively improving the furnace temperature uniformity and thermal efficiency. Under the action of strong pulse combustion, the combustion process and heat and mass transfer processes are significantly enhanced. For furnaces using high-speed burners, the heating rate of the steel plate is significantly accelerated, and the temperature of the wear-resistant plate and the temperature of the furnace tend to be consistent in the later stage of insulation.
4. Improve cooling water system
The cooling water closed-circuit circulation system is adopted to avoid the generation of high-temperature water vapor in the cooling water, improve the on-site environment, reduce the oxidation of furnace-related components in high-temperature and humid environments, reduce the loss of cooling water, and save energy.
5. Use roller type continuous quenching machine
The roller-type continuous quenching machine is superior to the traditional fixed pressure quenching machine. The wear-resistant plate is quenched in motion. The surface of the wear-resistant plate is evenly quenched and has no soft spots. The length of the quenched wear-resistant plate is not limited by the frame, which can effectively avoid scooping after quenching. Qu, the wear-resistant plate can be cooled to room temperature at a very high cooling rate; the production efficiency is high and the product quality is good.
6. Use vertical pickling equipment
Vertical pickling is better than traditional horizontal pickling: there are no watermarks, acid marks or yellow spots on both sides of the steel plate, no grease, no iron scale, no over-pickling phenomenon; small acid consumption, energy saving and cost saving; floor space Small; convenient for checking the surface of steel plates after pickling.
