1. The boiling steel plate is a steel plate which is hot rolled from ordinary carbon structural steel boiling steel. Boiling steel is a kind of deoxidized incomplete steel. Only a certain amount of weak deoxidizer is used to deoxidize the molten steel. The molten steel has a high oxygen content. When the molten steel is injected into the ingot mold, the carbon and oxygen reacts to generate a large amount of gas, causing the molten steel to boil. Boiling steel is named after this. Boiling steel has a low carbon content, and the silicon content in the steel is also low (Si < 0.07%) because it is not deoxidized by ferrosilicon.
The outer layer of the boiling steel is crystallized under the condition of vigorous stirring of the molten steel caused by boiling, so the surface layer is pure and compact, the surface quality is good, the plasticity and punching performance are good, and there is no large concentrated shrinkage hole, the cutting head Less, high yield, and the production process of boiling steel is simple, the consumption of iron alloy is less, and the cost of steel is low. Boiling steel sheets are used extensively in the manufacture of various stampings, construction and engineering structures and some less important machine structural components. However, there are many impurities in the core of the boiling steel, the segregation is serious, the structure is not dense, and the mechanical properties are not uniform. At the same time, due to the high gas content in the steel, the toughness is low, the cold brittleness and aging sensitivity are large, and the welding performance is also poor. Therefore, the boiling steel plate is not suitable for the manufacture of welded structures and other important structures that are subjected to impact loads, work under low temperature conditions.
2. The calming steel plate is a steel plate which is hot rolled from ordinary carbon structural steel killed steel. The killed steel is completely deoxidized steel. The molten steel is fully deoxidized with ferromanganese, ferrosilicon and aluminum before pouring. The molten steel has low oxygen content (generally 0.002-0.003%), and the molten steel is calmer in the ingot mold. No boiling occurs, and the calm steel is named after it. Under normal operating conditions, there are no air bubbles in the killed steel, and the structure is uniform and dense; due to low oxygen content, the oxide inclusions in the steel are less, the purity is higher, the cold brittleness and the aging tendency are small; at the same time, the segregation of the killed steel is small. The performance is relatively uniform and the quality is high. The disadvantage of killed steel is that it has concentrated shrinkage holes, low yield and high price. Therefore, the killed steel is mainly used for members subjected to impact at low temperatures, welded structures, and other members requiring high strength.
Low alloy steel sheets are both killed steel and semi-killed steel. Due to its high strength and superior performance, it can save a lot of steel and reduce the weight of the structure, and its application has become more and more extensive.
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