Weather-resistant hot rolled broad steel strip and method for manufacturing same
A manufacturing method and weather-resistant technology, applied in the field of weather-resistant steel and its manufacture, and weather-resistant hot-rolled wide steel strip, can solve the problems of difficulty in marketing and high cost, and achieve good atmospheric corrosion resistance, low cost, and no reduction in corrosion resistance Effect
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[0031] Example 1: Weather-resistant hot-rolled wide steel strip and its manufacturing method
[0032] 1. The chemical composition of steel is as follows in weight percentage:
[0033] C: 0.08%, Si: 0.38%, Mn: 0.38%, P: 0.086%, S: 0.005%, Cu: 0.263%, Cr: 0.349%, Ni: 0.125%, Alt: 0.021%, the rest is Fe and non Impurities to avoid.
[0034] 2. Manufacturing method of weather-resistant hot-rolled wide steel strip
[0035] (1) Production process
[0036] Hot metal pretreatment-top and bottom combined blowing converter smelting-LF ladle refining-slab continuous casting-1500 wide strip rolling (2) Take 6.0mm thick steel strip as an example, the thickness of the cast billet is 160mm, which is a medium and thin slab. Proceed as follows:
[0037]Hot metal pretreatment hot metal sulfur is controlled below 0.010%, the temperature is not less than 1250 ℃, and the slag on the surface of the hot metal is removed after desulfurization. End point control of converter smelting: C: 0.04%, S: 0.010%....
Example Embodiment
[0039] Example 2: Weather-resistant hot-rolled wide steel strip and its manufacturing method
[0040] 1. The chemical composition of steel is as follows in weight percentage:
[0041] C: 0.07%, Si: 0.35%, Mn: 0.38%, P: 0.089%, S: 0.006%, Cu: 0.281%, Cr: 0.375%, Ni: 0.133%, Alt: 0.015%, the rest is Fe and non Impurities to avoid.
[0042] 2. The manufacturing method of weather-resistant hot-rolled wide steel strip, and the production process flow is the same as that in Example 1.
[0043] Taking 3.8mm thick steel strip as an example, the casting billet thickness is 160mm, which is a medium-thin slab. Proceed as follows:
[0044] Hot metal pretreatment hot metal sulfur is controlled below 0.010%, the temperature is not less than 1250 ℃, and the slag on the surface of the hot metal is removed after desulfurization. End point control of converter smelting: C: 0.04%, S: 0.010%. LF refining white residue operation. Each furnace of molten steel is fed into a 500mSi-Ca wire for calcificat...
Example Embodiment
[0046] Example 3:
[0047] 1. The chemical composition of steel is as follows in weight percentage:
[0048] C: 0.08%, Si: 0.37%, Mn: 0.4%, P: 0.094%, S: 0.008%, Cu: 0.307%, Cr: 0.338%, Ni: 0.126%, Alt: 0.015%, the rest is Fe and non Impurities to avoid.
[0049] The manufacturing method is the same as in Example 1.
[0050] The performance data of the wide steel strip is listed in Table 1. The relevant test methods adopt international general standards:
[0051] Table 1
[0052]
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