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

[0032] A high-strength special-shaped channel steel, the element composition of the channel steel and the weight percentage content of each component are: C: 0.25%; Si: 0.28%; Mn: 1.22%; P: 0.014%; S: 0.010%; V: 0.14%; Nb: 0.01%; AL: 0.025%; Cr: 0.10%; Cu: 0.25%;

[0034] A high-strength special-shaped channel steel, the element composition of the channel steel and the weight percentage content of each component are: C: 0.28%; Si≤0.19%; Mn: 1.11%; P: 0.016%; S: 0.009%; V: 0.12%; Nb: 0.06%; AL: 2.50%; Cr: 0.27%; Cu: 0.10%;

[0036] A high-strength special-shaped channel steel, the element composition of the channel steel and the weight percentage content of each component are: C: 0.24%; Si: 0.20%; Mn: 1.29%; P: 0.024%; S: 0.019%; V: 0.10%; Nb: 0.02%; AL: 4.30%; Cr: 0.09%; Cu: 0.20%;

[0037] A preparation method of high-strength special-shaped channel steel, comprising the following steps:

[0038] a. The molten iron is pre-desulfurized, and the sulfur content in the molten iron after desulfurization is controlled not to exceed 0.022wt%;

[0039] b. Smelting

[0040] All metal materials should meet the quality standards and be used after baking according to the system.

[0041] c. Refining

[0042] The molten steel in the primary furnace is fed into the furnace. During the refining process, the slag is fully stirred to form white slag or yellow-white slag. During the refining period, the molten steel temperature is controlled at 1640±10℃.

[0043] d. Electroslag remelting

[0044] The surface de