High-strength special-shaped channel steel and preparation method thereof

Abstract

The invention relates to the technical field of channel steel, and discloses high-strength special-shaped channel steel, which comprises the following elements in percentage by weight: less than or equal to 0.23-0.30% of C, less than or equal to 0.35% of S, less than or equal to 0.45% of P, less than or equal to 0.45% of S and Si is smaller than or equal to 0.15% and 0.30%; mn: 1.00% to 1.30%; less than or equal to 0.025% of P; less than or equal to 0.020% of S; v < = 0.15%; nb < = 0.07%; the content of AL is 0.015 to 4.50 percent; less than or equal to 0.30% of Cr; 0.30% or less of Cu; according to the special-shaped channel steel, electroslag remelting is adopted after smelting, the purity of metal can be improved through electroslag remelting, the situation that the metal is oxidized by gas in the metal is avoided, the corrosion resistance of the special-shaped channel steel can be improved, and then the use strength of the special-shaped channel steel is improved; ferro-aluminum-manganese-iron is adopted for deoxidation, so that the deoxidation speed is high, and slag formation is good; and the addition amount of the aluminum element is reasonably controlled, oxidation in the molten steel can be stopped, and inclusions generated by re-deoxidation in the solidified steel can be reduced.

Description

technical field [0001] The invention relates to the technical field of special channel steel, in particular to a high-strength special-shaped channel steel and a preparation method thereof. Background technique [0002] Channel steel is a long strip of steel with a groove-shaped cross-section. It is a carbon structural steel for construction and machinery. It is a section steel with a complex cross-section. Its cross-sectional shape is groove-shaped. Machinery and vehicle manufacturing, etc. [0003] In the existing channel steel, during forging and hot rolling, there may be fractures and other phenomena, resulting in the generation of defective products. After the alloy material used for the channel steel is smelted, a small amount of gas will be contained in the metal, which will cause it to be damaged. Oxidation leads to impurity of the metal, which will affect the corrosion resistance of the channel steel, thereby affecting its service strength. At the same time, the am...

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Problems solved by technology

[0003] Existing channel steels may break during forging and hot rolling procedures, resulting in defective products. After the alloy materials used for channel steels are smelted, a small amount of gas will be contained in the metal, which will cause them to be smelted. Oxidation will lead to impure metal, which will affect the corrosion resistance of channel steel, and then affect its service strength. At the same time, the amount of various elements in the alloy is not well controlled, which will also make the strength of channel steel poor.