Q690D carbon steel plate sheet overheat sensitivity
SM490B steel, Q690D carbon steel plate sheet is a kind of low carbon welded structural steel. With this low carbon equivalent, it can produce good cold forming properties. SM490B steel plate is usually supplied in hot rolling or controlled rolling delivery conditions. The SM490B is commonly used in the engineering and construction industries. It has high yield and tensile strength, and provides a variety of processing and testing options to make it highly available in your construction projects.
The sulfur element (S element) comes from the ore and fuel coke of steelmaking. It is a harmful element in Q690D carbon steel plate sheet etc. steel. Sulfur exists in steel in the form of iron sulfide (FeS). FeS and Fe form a low melting point (985℃) compound. The hot working temperature of steel is generally above 1150 - 1200℃, so when the steel is hot working, the premature melting of FeS compound causes the workpiece to crack, which is called "hot brittleness". It reduces ductility and toughness of steel and causes cracks during forging and rolling. Sulfur is also detrimental to welding performance and reduces corrosion resistance.
In the production process of the ironmaking process, the moisture content and air temperature of the ironmaking blast furnace blast have a direct impact on the fuel consumption and fuel consumption structure of the ironmaking process. Blast furnace blast dehumidification is to remove the moisture in the blast furnace blast, eliminate the adverse effects of atmospheric humidity fluctuations on the blast furnace forward movement, and create stable operating conditions for the fans.
For Q690D carbon steel plate sheet buyers, the impact of the rise and fall of Q690D carbon steel plate sheet prices is great. Because of the large amount of Q690D carbon steel plate sheet purchases and the large amount of funds involved, many Q690D carbon steel plate sheet purchasers will carefully consider the price issue, and some Q690D carbon steel plate sheet purchasers who are far away will also consider the freight issue. When the price of Q690D carbon steel plate sheet overall drops, a large number of Q690D carbon steel plate sheet buyers will hoard in large quantities. When Q690D carbon steel plate sheet prices rise, we should predict and stock up appropriately.
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