Technique for preparing fine oxide dispersion steel
A process method and oxide technology, applied in the field of metallurgy, can solve problems such as difficulty in mass production of molten steel, and achieve the effects of effective and complete control, simple process and easy operation
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Embodiment 1
[0036] Preparation of fine oxide dispersed steel: first feed the cored wire after alloying in the late stage of LF refining, stop argon blowing and stirring during the wire feeding process, feed the wire at a speed of 180-350m / min, and feed at a rate of 100-800m / t. Stand still for 0.5-10 minutes after feeding the line, and then carry out argon blowing treatment. The flow rate of argon gas is 50-280Nl / min, and the time of weak argon blowing is 0.5-5 minutes. Vacuum, clean cycle. When the oxygen content of the molten steel is 0.0001-0.008%, the composite sphere whose core is mainly beneficial oxide and expansion agent is added to the molten steel. Immediately after 5 minutes, move out for pouring, and continuous casting adopts full protection pouring.
[0037] The preparation of the cored wire, firstly, the preparation of low melting point pre-melted slag, taking 40kg of CaO powder, Al 2 o 3 Powder 35kg, SiO 2 Powder 10kg, MgO powder 10kg, CaF 2 Put 5kg of powder into a mix...
Embodiment 2
[0041] Preparation of fine oxide dispersed steel: the ladle is transported to the RH station, vacuumized, deoxidized and alloyed, and cleaned, and the cored wire is fed in the late stage of RH refining. The feeding position is selected on the side of the RH downcomer, and the feeding speed is 180 ~350m / min, the feed rate is 100~800m / t, and the cycle time after feeding the line is 3~10min; when the oxygen content of the molten steel is 0.0001~0.008% by sampling and analysis, the core is mainly beneficial oxides and expansion agents The composite spheres are added into the molten steel, and the adding position is the downcomer on the opposite side of the feeding pipe. After the composite spheres are added, they circulate for 1 to 3 minutes and are immediately taken out for pouring. The continuous casting adopts the whole process of protective pouring.
[0042] The preparation of described cored wire, at first get CaO 10kg, Al 2 o 3 50kg, SiO 2 5kg, MgO 5kg, CaF 2 The metho...
Embodiment 3
[0045] Preparation of fine oxide dispersed steel: After the molten steel is deoxidized, the finished powder is sprayed into the molten steel after VD refining, and the conveying gas is Ar, CO 2 For the mixed gas of the two, the conveying pressure is controlled at 0.01-2.0MPa, the powder feeding amount is 0.3-1.5kg / t, and the powder conveying rate is 0.01-3.5kg / s; the ladle is transported to the RH station for refining, when sampling When the oxygen content of the molten steel is analyzed to be 0.0001-0.008%, the composite sphere whose core is mainly beneficial oxide and expansion agent is added to the molten steel during the RH refining process. Immediately move out for pouring after 1 to 5 minutes of post-circulation, and continuous casting adopts full protection pouring.
[0046] The preparation of described pulvis, at first gets CaO 70kg, Al 2 o 3 15kg, SiO 2 3kg, MgO 2kg, CaF 2 10 kg of low-melting point pre-melting slag powder is prepared with the same method as in...
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