High-strength petroleum pipeline steel and its preparation method
A pipeline steel and high-strength technology, which is applied in the field of high-strength petroleum pipeline steel and its preparation, can solve the problems of disclosure of chemical composition and its production method, large anisotropy of hot continuous rolling, poor steel plate, etc. The effect of eliminating the heat treatment process, greatly increasing the strength and saving the process cost
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Embodiment 1
[0051] (1) KR hot metal pretreatment desulfurization: oxygen blowing time is 15min, oxygen supply intensity is 18000m3 / h, sulfur content in hot metal after treatment is ≤0.005%;
[0052] (2) Converter smelting: Double slag operation is adopted, the bottom blowing of the converter adopts an automatic model, when the carbon content is 0.18%, supplementary blowing is performed once, the carbon content target is ≤0.055%, the phosphorus content is ≤0.015%, and the tapping temperature is 1600°C; Slag plug, slag blocking rod double slag blocking tapping; 1050kg of lime and 230kg of fluorite are added to make top slag during tapping;
[0053] (3) LF+RH refining process: LF white slag treatment, slag target composition: CaO50%, SiO230%, Al2O315%, MgO5%, FeO+Fe2O3+MnO≤1.0%, vacuum degree≤2mbar; vacuum treatment time 22 minutes ;
[0054] (4) Continuous casting process: argon blowing protection throughout the process to avoid oxidation of molten steel and control nitrogen increase in th...
Embodiment 2
[0058] (1) KR hot metal pretreatment desulfurization: oxygen blowing time is 15min, oxygen supply intensity is 18000m3 / h, sulfur content in hot metal after treatment is ≤0.005%;
[0059] (2) Converter smelting: Double slag operation is adopted, the bottom blowing of the converter adopts an automatic model, when the carbon content is 0.18%, supplementary blowing is performed once, the carbon content target is ≤0.055%, the phosphorus content is ≤0.015%, and the tapping temperature is 1600°C; Slag plug, slag blocking rod double slag blocking tapping; 1050kg of lime and 230kg of fluorite are added to make top slag during tapping;
[0060] (3) LF+RH refining process: LF white slag treatment, slag target composition: CaO50%, SiO230%, Al2O315%, MgO5%, FeO+Fe2O3+MnO≤1.0%, vacuum degree≤2mbar; vacuum treatment time 22 minutes ;
[0061] (4) Continuous casting process: use a protective cover, implement argon blowing protection throughout the process, avoid oxidation of molten steel, an...
Embodiment 3
[0065] (1) KR hot metal pretreatment desulfurization: oxygen blowing time is 15min, oxygen supply intensity is 18000m3 / h, sulfur content in hot metal after treatment is ≤0.005%;
[0066] (2) Converter smelting: Double slag operation is adopted, the bottom blowing of the converter adopts an automatic model, when the carbon content is 0.18%, supplementary blowing is performed once, the carbon content target is ≤0.055%, the phosphorus content is ≤0.015%, and the tapping temperature is 1600°C; Slag plug, slag blocking rod double slag blocking tapping; 1050kg of lime and 230kg of fluorite are added to make top slag during tapping;
[0067] (3) LF+RH refining process: LF white slag treatment, slag target composition: CaO50%, SiO230%, Al2O315%, MgO5%, FeO+Fe2O3+MnO≤1.0%, vacuum degree≤2mbar; vacuum treatment time 22 minutes ;
[0068] (4) Continuous casting process: use a protective cover, implement argon blowing protection throughout the process, avoid oxidation of molten steel, an...
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