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The method of refining 14cr1mo alloy steel by using premelting refining slag outside the furnace

A 14cr1mo, out-of-furnace refining technology, applied in the field of metal smelting, can solve the problems of steel product quality not meeting requirements, furnace age reduction, furnace lining erosion, etc., to shorten the refining time, improve the quality of molten steel, and reduce the cost of steelmaking.

Active Publication Date: 2020-06-16
LANZHOU LS GRP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the melting temperature of simple mixed refining slag is relatively high (about 1440°C), and a large amount of metallurgical materials and electric energy will be consumed in the melting process. The high-temperature liquid steel will corrode the furnace lining, which will easily reduce the furnace life.
The difference in the specific gravity of the simple mixed refining slag is likely to cause problems such as component segregation, easy hydration, and unstable performance, which will greatly affect the effect of molten steel refining and cause the quality of steel products to fail to meet the requirements

Method used

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Examples

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Embodiment

[0016] A method for refining 14Cr1Mo alloy steel outside a furnace using pre-melted refining slag, the mass percent content of each component in the 14Cr1Mo alloy steel smelted by the method is: C0.11-0.15%, Si0.50-0.65%, Mn0. 40-0.55%, P≤0.007%, S≤0.005, Cr1.15-1.50%, Mo0.45-0.60%, Ni≤0.20%, Cu≤0.15, V≤0.010%, Ti≤0.010%, Nb≤0.010 %, Al0.015-0.35%, As≤0.010%, Sb≤0.0025%, Sn≤0.010%, H<2ppm, O<20ppm, N<80ppm;

[0017] This method comprises the following steps:

[0018] Step 1. The electric arc furnace smelting charge includes carbon scrap steel and chromium molybdenum scrap steel. The proportion of steel scrap into the furnace is less than 5%, and the carbon content is 0.70-0.80%. The mass percentage content of C is ≤0.07%, and the mass percentage content of P is ≤0.002%. The molten steel is tapped after pre-deoxidation alloying treatment; Smelting and refining slag 0.001Kg; when the tapping quality reaches 1 / 2, add ferrosilicon 1.5kg per ton of molten steel in the ladle, and ...

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PUM

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Abstract

The invention discloses a method for refining 14Cr1Mo alloy steel outside the furnace by using pre-melted refining slag. / 2 Add ferrosilicon, add Mn-Fe, Cr-Fe, Mo-Fe alloy according to the lower limit of the internal control composition, add lime to 2 / 3 of the tapping, enter the LF furnace for composition and temperature adjustment, and then enter the VD furnace to complete degassing, Stirring and other tasks. The composition of premelted refining slag includes Al in mass percentage 2 o 3 40.25%, CaO45.62%, MgO1.91%, Fe 2 o 3 1.08%, SiO 2 4.23%, N 2 <200PPm, it has the characteristics of fast melting, low gas content, high activity, fast slagging speed, early white slag appearance, and good fluidity after melting. Refining can absorb most of the deoxidation and desulfurization products in molten steel, improve the quality of molten steel, shorten the refining time, reduce the cost of steelmaking, and produce super high-quality steel.

Description

technical field [0001] The invention relates to the technical field of metal smelting, in particular to a method for refining 14Cr1Mo alloy steel outside a furnace by using pre-melted refining slag, which is suitable for slag making and refining operations in ladles for secondary refining of steelmaking. Background technique [0002] 14Cr1Mo alloy steel is used for pressure vessels, which is highly sensitive to shrinkage, porosity, segregation, non-metallic inclusions, and white spots. Improving the smelting process plays an important role in improving the quality of steel. At present, steelmaking generally adopts out-of-furnace refining technology, which transfers all or part of the work of deoxidation, desulfurization, gas reduction, reduction of inclusions, adjustment of steel composition and temperature in the steelmaking process to the ladle furnace, in order to obtain clean steel. , and achieved good results of high yield, high quality and low cost. Among many refinin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/44C22C38/42C22C38/46C22C38/50C22C38/48C22C38/06C22C38/04C22C38/02C22C33/06C21C7/06C21C7/064C21C7/068C21C7/10
CPCC21C7/0056C21C7/06C21C7/064C21C7/068C21C7/10C22C33/06C22C38/02C22C38/04C22C38/06C22C38/42C22C38/44C22C38/46C22C38/48C22C38/50Y02P10/20
Inventor 韩文科赵子文张哲瑞牛立群祁庆花杨德生李慧
Owner LANZHOU LS GRP
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