Steel for hot-rolling ribbed high-strength steel bars of 700 Mpa or above and production method of high-strength steel bars
A technology of hot-rolled ribbed and high-strength steel bars, which is applied in the field of hot-rolled ribbed steel bars, can solve the problems that hot-rolled ribbed steel bars cannot meet the strength requirements of building structures, so as to prevent secondary pollution, save alloy consumption, and avoid excessive The effect of oxidation
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Embodiment 1
[0071] The chemical composition and mass percentage content of the steel for hot-rolled ribbed high-strength steel bars above 700Mpa in this embodiment are: C: 0.20-0.30%, Si: 0.80-1.20%, Mn: 1.30-1.50%, V: 0.10-0.20%, N: 0.015-0.025%, Cr: 0.40-0.60%, P: ≤0.025%, S: ≤0.010%, and the rest are Fe and unavoidable impurity elements.
[0072] Its corresponding embodiment main chemical constituent composition and mass percentage content are as shown in table 1:
[0073] The smelting chemical composition of table 1 embodiment 1
[0074]
[0075] The production method of a kind of hot-rolled ribbed high-strength steel bar above 700Mpa level of the present embodiment comprises the following steps:
[0076] S1. Converter or electric arc furnace steelmaking, and slag blocking and tapping (the slag contains P, S and other harmful elements, if the slag flows into the ladle, it will cause the molten steel to return to P and S), and the tapping temperature is 1635-1675°C. When 1 / 4 of th...
Embodiment 2
[0100] The chemical composition and mass percentage content of the steel for hot-rolled ribbed high-strength steel bars above 700Mpa in this embodiment are: C: 0.30-0.40%, Si: 0.80-1.20%, Mn: 1.00-1.20%, V: 0.15-0.25%, N: 0.015-0.025%, Cr: 0.80-1.00%, P: ≤0.020%, S: ≤0.010%, and the rest are Fe and unavoidable impurity elements.
[0101] Its corresponding embodiment main chemical constituent composition and mass percent content are as shown in table 5:
[0102] The smelting chemical composition of table 5 embodiment 2
[0103]
[0104] The production method of a kind of hot-rolled ribbed high-strength steel bar above 700Mpa level of the present embodiment comprises the following steps:
[0105] S1. Converter or electric arc furnace steelmaking, and slag blocking and tapping (the slag contains P, S and other harmful elements, if the slag flows into the ladle, it will cause the molten steel to return to P and S), and the tapping temperature is 1635-1675°C. When 1 / 4 of the s...
Embodiment 3
[0129] The chemical composition and mass percentage content of the steel for hot-rolled ribbed high-strength steel bars above 700Mpa in this embodiment are: C: 0.40-0.50%, Si: 0.80-1.20%, Mn: 1.00-1.20%, V: 0.15-0.25%, N: 0.015-0.025%, Cr: 0.80-1.00%, P: ≤0.020%, S: ≤0.010%, and the rest are Fe and unavoidable impurity elements.
[0130] Its corresponding embodiment main chemical constituent composition and mass percentage content are as shown in table 9:
[0131] The smelting chemical composition of table 9 embodiment 3
[0132]
[0133] The production method of a kind of hot-rolled ribbed high-strength steel bar above 700Mpa level of the present embodiment comprises the following steps:
[0134] S1. Converter or electric arc furnace steelmaking, and slag blocking and tapping (the slag contains P, S and other harmful elements, if the slag flows into the ladle, it will cause the molten steel to return to P and S), and the tapping temperature is 1635-1675°C. When 1 / 4 of th...
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