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A steel billet for wheel steel, its preparation method and its product
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A technology of wheel steel and steel billet, which is applied in the field of its preparation and steel billet for wheel steel, and can solve the problem of high cost
Active Publication Date: 2021-09-21
SHOUGANG CORPORATION
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Chinese patent CN1035556050A discloses a method for producing wheel steel using LF+RH refining process. This process can control more than 98% of the various inclusions in the billet to be 1.0 or below under the condition that the composition of the molten steel is guaranteed to be qualified. A LF refining process was adopted, and the cost was obviously high
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Embodiment 1
[0048] Prepare steel billet for wheel steel of the present invention:
[0049] In terms of mass percentage, the billet for wheel steel in the present invention contains: C 0.07%, Mn 0.1%, Al 0.02%, Si 0.05%, P 0.02%, S 0.006%, and the balance is iron and unavoidable impurities.
[0050] (1) KR desulfurization treatment: carry out KR desulfurization treatment on molten iron or scrap steel (low S scrap steel, without using pig iron block, slag steel, and cold solidified pellets), and control the target value and slag removal rate of KR desulfurization treatment; among them, according to the quality In terms of percentage, the desulfurized molten iron contains: S≤0.001%; the slagging efficiency of the KR desulfurization treatment is 100%.
[0051] (2) Dephosphorization converter smelting: the desulfurized molten steel obtained in step (1) is subjected to dephosphorization converter smelting, wherein, after the dephosphorization converter smelting is completed, the slag is used ...
Embodiment 2
[0064] Prepare steel billet for wheel steel of the present invention:
[0065] In terms of mass percentage, the billet for wheel steel in the present invention contains: C 0.10%, Mn 0.8%, Al 0.05%, Si≤0.04%, P 0.01%, S 0.004%, and the balance is iron and unavoidable impurities .
[0066] (1) KR desulfurization treatment: carry out KR desulfurization treatment on molten iron or scrap steel (low S scrap steel, without using pig iron block, slag steel, and cold solidified pellets), and control the target value and slag removal rate of KR desulfurization treatment; among them, according to the quality In terms of percentage, the desulfurized molten iron contains: S≤0.001%; the slagging efficiency of the KR desulfurization treatment is 120%.
[0067] (2) Dephosphorization converter smelting: the desulfurized molten steel obtained in step (1) is subjected to dephosphorization converter smelting, wherein, after the dephosphorization converter smelting is completed, the slag is use...
Embodiment 3
[0079] Prepare steel billet for wheel steel of the present invention:
[0080] In terms of mass percentage, the billet for wheel steel in the present invention contains: C 0.10%, Mn 0.5%, Al 0.02%, Si 0.02%, P 0.01%, S 0.001%, and the balance is iron and unavoidable impurities.
[0081] (1) KR desulfurization treatment: carry out KR desulfurization treatment on molten iron or scrap steel (low S scrap steel, without using pig iron block, slag steel, and cold solidified pellets), and control the target value and slag removal rate of KR desulfurization treatment; among them, according to the quality In terms of percentage, the desulfurized molten iron contains: S≤0.001%; the slagging efficiency of the KR desulfurization treatment is 130%.
[0082] (2) Dephosphorization converter smelting: the desulfurized molten steel obtained in step (1) is subjected to dephosphorization converter smelting, wherein, after the dephosphorization converter smelting is completed, the slag is used ...
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Abstract
The invention provides a steel slab for wheel steel, the steel slab contains: C 0.07-0.10%, Mn 0.1-0.8%, Al 0.02-0.05%, Si≤0.05%, P≤0.02%, S≤ 0.006%, the balance is iron and unavoidable impurities. The preparation method of the billet comprises the following steps: performing KR desulfurization treatment on molten iron or scrap steel to obtain desulfurized molten iron; performing dephosphorization converter smelting on the desulfurized molten iron to obtain semi-steel; performing decarburization converter smelting on the semi-steel to obtain Decarburized molten steel; performing RH refining on the decarburized molten steel to obtain RH refined molten steel; performing continuous casting on the RH refined molten steel to obtain the steel billet for the wheel steel; wherein, the desulfurized molten iron comprises: S ≤0.001%; the slag removal efficiency of the KR desulfurization treatment is ≥98%; the semi-steel contains: P≤0.035%; the decarburization converter smelting adopts the top-bottom combined blowing mode. The preparation method of the present invention carries out refined operation while process control is carried out, so that the obtained steel billet for wheel steel contains a lower level of inclusions.
Description
technical field [0001] The invention belongs to the field of steelmaking, and in particular relates to a billet for wheel steel, its preparation method and its product. Background technique [0002] Although the performance of the wheel steel billet prepared by the existing technology and production process meets the requirements of normal use, but with the continuous improvement of product quality requirements of customers, the requirements for the control of inclusions in the wheel steel billet are also getting higher and higher. Therefore, how to stably control the inclusions in the wheel steel slab at a low level requires fine-tuning operations while process control is performed. [0003] Chinese patent CN101245434A discloses a wheel steel and its smelting method. It adopts LF refining process. In the LF refining furnace, silicon aluminum bariumstrontiumcalcium deoxidizer is used. The B and D inclusions of the wheel steel produced by this process exceed the standard. ...
Claims
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