Method for overcoming defect of forming pits in hot rolling process of high-strength IF steel containing P
A technology of hot rolling process and pitting, which is applied in the field of steel rolling, can solve the problems of high cost of equipment transformation, lack of operability, and large investment in equipment, and achieve the effects of improving surface quality, eliminating pitting defects, and saving production costs
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Embodiment 1
[0032] Utilize the method provided in this embodiment to solve pitting defects in the hot rolling process of P-containing high-strength IF steel to produce 100 volumes of P-containing high-strength IF steel on a 2160mm hot rolling production line, wherein the chemical composition quality of P-containing high-strength IF steel The percentage and surface conditions are shown in Table 1. In the strip surface quality judgment system, grade 1 is the best and grade 4 is the worst.
[0033] Table I
[0034]
[0035]
[0036] After using this patented method to optimize the Si content, the proportion of the first-grade product on the surface has been greatly increased to 62%; after optimizing the Si content, the surface appearance of the strip steel is as follows Figure 4 , Figure 5 shown. The main reason for the degradation of the surface quality of the P-containing high-strength IF steel is the surface pitting defect. Therefore, the method provided in this embodiment can e...
Embodiment 2
[0044] Utilize the method provided in this embodiment to solve pitting defects in the hot rolling process of P-containing high-strength IF steel to produce 100 volumes of P-containing high-strength IF steel on a 2160mm hot rolling production line, wherein the P element of P-containing high-strength IF steel The Si content is 0.04%, the content of Si element is 0.2%, the finish rolling entrance temperature is controlled at 1000°C, the steel throwing speed of the last stand is controlled at 11m / s, the proportion of the first-grade product is 60%, and the proportion of the second-grade product is 30%, the proportion of third-grade products is 5%, and the proportion of fourth-grade products is 5%.
Embodiment 3
[0046] Utilize the method provided in this embodiment to solve pitting defects in the hot rolling process of P-containing high-strength IF steel to produce 100 volumes of P-containing high-strength IF steel on the hot rolling production line, wherein the P element content of P-containing high-strength IF steel 0.065%, the content of Si element is 0.3%, the entrance temperature of finishing rolling is controlled at 990℃, the steel throwing speed of the last stand is controlled at 12m / s, the proportion of first-grade products is 65%, and the proportion of second-grade products is 24%. %, the proportion of third-grade products is 7%, and the proportion of fourth-grade products is 4%.
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