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A method for controlling the purity of heavy rail steel

A pure, heavy-gauge steel technology, applied in the manufacture of converters, etc., can solve the problems of low desulfurization efficiency and no consideration of inclusions, etc., and achieve high desulfurization efficiency, desulfurization efficiency and stable effects

Active Publication Date: 2017-01-11
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Patent No. CN102732667A discloses a method for rapid desulfurization of heavy rail steel refining, which enables heavy rail steel to quickly reduce MnS inclusions in the LF furnace, but this patent does not consider other inclusions
Patent No. CN104313245A discloses a method for rapid desulfurization of heavy rail steel refining, which enables the heavy rail steel to achieve rapid desulfurization in the LF furnace while reducing the level of heavy rail steel A-type inclusions, but the patent The desulfurization efficiency is low, and it only acts on type A inclusions

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] A, converter smelting

[0047] The molten iron entering the converter has an S content of 0.016%. After the converter smelting is completed, the steel is tapped. During the tapping process, a silicon-calcium-barium alloy is added to the ladle for deoxidation. The amount added is 2.5kg of silicon-calcium-barium and silicon-calcium After the addition of barium is completed, other alloys required by the steel grade are added immediately, and at the same time, active lime is added to the ladle to add 5kg per ton of molten steel. After tapping, evenly add calcium carbide to the ladle slag surface to add 0.2kg per ton of molten steel. In the above-mentioned tapping process, the flow rate of argon blowing at the bottom of the ladle is 60NLl / min. After tapping, blow argon for 6 minutes with a bottom blowing argon flow rate of 50NL / min, and then send the molten steel to LF for refining.

[0048] B, LF furnace refining

[0049] After the molten steel arrives at the LF station,...

Embodiment 2

[0056] A, converter smelting

[0057] The molten iron entering the converter has an S content of 0.020%. After the converter smelting is completed, the steel is tapped. During the tapping process, a silicon-calcium-barium alloy is added to the ladle for deoxidation. The amount of addition is 3.5kg per ton of molten steel. Immediately after the addition is completed, other alloys required by the steel grade are added. At the same time, add 5kg of active lime per ton of molten steel to the ladle. After tapping, 0.4kg of calcium carbide per ton of molten steel is evenly added to the ladle slag surface. In the above tapping process, the argon gas flow rate of ladle bottom blowing is 60NL / min. After tapping, blow argon for 6 minutes with a bottom blowing argon flow rate of 50NL / min, and then send the molten steel to LF for refining.

[0058] B, LF furnace refining

[0059] After the molten steel reaches the LF station, turn on the bottom blowing argon to blow the argon at the b...

Embodiment 3

[0066] A, converter smelting

[0067] The molten iron entering the converter has an S content of 0.010%. After the converter smelting is completed, the steel begins to be tapped. During the tapping process, a silicon-calcium-barium alloy is added to the ladle for deoxidation. The amount of addition is 3.0kg per ton of molten steel. Then add other alloys required by the steel grade. At the same time, add 3kg of active lime per ton of molten steel to the ladle. After tapping, 0.3 kg of calcium carbide per ton of molten steel is evenly added to the slag surface of the ladle. In the above tapping process, the argon gas flow rate of ladle bottom blowing is 60NL / min. After tapping, blow argon for 6 minutes with a bottom blowing argon flow rate of 50NL / min, and then send the molten steel to LF for refining.

[0068] B, LF furnace refining

[0069] After the molten steel reaches the LF station, turn on the bottom blowing argon to blow the argon at the bottom of the ladle. The flow...

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PUM

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Abstract

The invention discloses a method for controlling the purity of heavy rail steel. The method includes the following steps of converter smelting, ladle furnace (LF) refining, Ruhrstahl Heraeus (RH) vacuum treatment and continuous casting. By the adoption of the refining method that active lime is used in the process of a converter and active lime, silicon carbide and quartz sand are used for slagging in the refining process, the sulphur content of prepared heavy rail steel continuous casting billets is controlled to be equal to or smaller than 0.006%, and all grades of inclusions in the heavy rail steel are equal to or lower than 2.0. According to the method for controlling the purity of the heavy rail steel, relatively high basicity is adopted, desulphurization efficiency is high and stable, and the method can obviously reduce various inclusions in molten steel.

Description

technical field [0001] The invention relates to the technical field of iron and steel smelting, in particular to a method for controlling the purity of heavy rail steel. Background technique [0002] Steel rails are the main components of railway tracks. During railway transportation, to provide effective support and guidance for locomotives, they need to bear huge vertical pressure from wheels. Based on the development needs of my country's infrastructure construction, railway transportation is developing at a rapid speed, and it is becoming more and more high-speed and heavy-duty. This undoubtedly puts forward more stringent requirements on the quality of rails. When the rail is in contact with the wheel, it bears the reciprocating and variable load of the locomotive, and its purity has an important impact on the fatigue life of the rail. [0003] Due to the hindering effect of the inclusions in the steel on the continuity of the steel matrix structure, the steel is sepa...

Claims

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Application Information

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IPC IPC(8): C21C5/28C21C7/10C21C7/04
Inventor 陈亮陈天明杨森祥郭华黄禹明李红光黄德胜杨文中陈雄冯远超
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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