Q390C steel plate small knowledge points answers

Q390C steel plate cutting method

Preheating cutting: The most 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 flame burner and electronic heating pad. Use a 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 plate 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 cracks occur in the cut edges of the steel plates, they will appear within 48 hours to several weeks after the thickness is cut. Therefore, open cracks are delayed cracks. The greater the thickness and hardness of the steel sheet, the larger the open cracks.

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 properties 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, and labor and energy saving, which benefit component manufacturers and users.

The steel plate generally chooses the process roads of refined materials into 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 deoxidizer and alloy after tapping, the molten steel is treated by argon blowing, and then cast immediately, and the molten steel after argon blowing and temperature adjustment is cast into slabs by the continuous casting machine. In addition to rare earth elements, the 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. The 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 media in chemical and petroleum equipment.