Q390C steel plate cutting method
Preheating cutting: An effective way to prevent steel plate from cutting cracks is to preheat before cutting. Before flame cutting, the steel plate is usually preheated. The preheating temperature unevenness mainly depends on the quality grade and thickness of the steel plate, as shown in Table 2. The preheating method can be carried out with a flame burner or an electronic heating pad. Use heating furnace to heat. In order to determine the preheating effect of the steel plate, the required temperature should be tested at the heating point
1. The steel plate cutting method is suitable for cold cutting and hot cutting. Cold cutting includes water jet cutting, shearing, sawing or abrasive cutting; hot cutting includes oxygen fuel flame cutting (hereinafter referred to as "flame cutting"), iso-particle cutting and laser cutting.
2. Cutting method: Through related process experiments, we can grasp the general characteristics and cutting thickness range of various cutting methods of steel plate.
3. The flame cutting method of high-grade steel plates is the same and simple as that of general low-carbon and low-alloy steel. When cutting weather-resistant thick plates, you need to pay attention! ! ! As the thickness and hardness of the steel plate increase, the cut edges show an increased tendency to crack. In order to avoid the occurrence of steel plate cutting cracks, the following suggestions should be followed when cutting:
Cutting cracks: Cutting cracks in steel plates are similar to hydrogen-induced cracks during welding. If a crack occurs on the cutting edge of the steel plate, it will appear within 48 hours to several weeks after the thickness is cut. Therefore, cut cracks are delayed cracks, and the greater the thickness and hardness of the steel sheet, the larger the cut cracks appear.

The primary application field of Q390C steel plate
Steel plates are mainly used for steel structures that are exposed to the atmosphere for a long time, such as railways, vehicles, bridges, and towers. Used to manufacture structural parts such as containers, railway vehicles, oil derricks, seaport construction, oil production channels, and containers containing hydrogen sulfide corrosive medium in chemical and petroleum equipment.
Steel plate steel plate is made of ordinary carbon steel with a small amount of corrosion-resistant elements such as copper and nickel. It has the characteristics of high-quality steel such as strength, ductility, forming, welding, abrasion, high temperature, fatigue, etc.; weather resistance is 2~ of ordinary carbon steel 8 times, the coating performance is 1.5-10 times that of ordinary carbon steel, which can be used for thinning, bare use or simplified coating.
The steel plate has the characteristics of rust resistance, corrosion resistance and longevity of components, thinning and consumption reduction, labor-saving and energy-saving characteristics, which benefit component manufacturers and users.
Steel plates are generally selected from the process of entering the furnace-tempering (converter, electric furnace-microalloying treatment-argon blowing-LF refining-low superheat continuous casting (feeding rare earth wire)-controlled rolling and controlled cooling. During the exercise, scrap steel Participate in the furnace along with the charge, exercise according to the conventional process, participate in the deoxidizer and alloy after the steel is tapped, the molten steel is treated by argon blowing, and then cast immediately, and the molten steel after the argon blowing and temperature adjustment is cast into slabs by the continuous casting machine. Because of the steel In addition to rare earth elements, weathering steel is purified, and the content of inclusions is greatly reduced.
The weather resistance is 2-8 times that of ordinary carbon steel, and the coating property is 1.5-10 times that of ordinary carbon steel. It can be used in thinner, bare or simplified coating applications. This steel has the characteristics of rust resistance, corrosion resistance and longevity of components, thinning and consumption reduction, labor-saving and energy-saving, which benefit component manufacturers and users.
Steel plate products are used to manufacture structural parts such as containers, railway vehicles, oil derricks, seaport construction, oil production channels, and containers containing hydrogen sulfide corrosive medium in chemical and petroleum equipment.