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Method for solving blockage of pouring nozzle of billet caster producing high carbon chromium bearing steel

A technology for producing high-carbon chromium bearings and billet continuous casting is applied in the field of solving the blockage of the pouring nozzle of billet continuous casting machines for producing high-carbon chromium bearing steel, which can solve the problem that the calcium content of molten steel exceeds the standard and cannot produce high-quality bearing steel and other problems, to achieve the effect of improving the full-flow drawing rate, simplifying continuous casting equipment and operations, and reducing secondary oxidation.

Inactive Publication Date: 2020-02-14
HANDAN IRON & STEEL GROUP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, some metallurgical enterprises still use the billet continuous casting machine to produce high-carbon chromium bearing steel and still use the calcium treatment process, resulting in excessive calcium content in molten steel, making it impossible to produce high-grade high-quality bearing steel

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] In this embodiment, the high-carbon chromium bearing steel steel grade is GCr15. The method for solving the clogging of the pouring nozzle of the high-carbon chromium bearing steel produced by the billet continuous casting machine includes LF refining, RH refining, and continuous casting processes. The specific process steps are as follows:

[0023] (1) LF refining process: Aluminum wire is added in the early stage of LF refining, and the aluminum content of molten steel is controlled at 0.06wt%. Calcium treatment is performed in the middle stage of LF refining. The amount of calcium wire added is 0.35kg / t steel, and the Ca content of molten steel is controlled at 0.0024wt%. , the sulfur content of the molten steel composition before calcium treatment is 0.002wt%; after the calcium treatment of molten steel, before the LF refining leaves the station, the molten steel is treated with soft blowing, and the soft blowing time is controlled at 8 minutes;

[0024] (2) RH refin...

Embodiment 2

[0028] In this embodiment, the high-carbon chromium bearing steel steel grade is G8Cr15. The method for solving the clogging of the pouring nozzle of the high-carbon chromium bearing steel produced by the billet continuous casting machine includes LF refining, RH refining, and continuous casting processes. The specific process steps are as follows:

[0029] (1) LF refining process: Aluminum products are added in the early stage of LF refining, and the aluminum content of molten steel is controlled at 0.031wt%. Calcium treatment is performed in the middle stage of LF refining. The amount of calcium wire added is 0.10kg / t steel, and the Ca content of molten steel is controlled at 0.0013wt%. , the sulfur content of the molten steel component before calcium treatment is 0.004wt%; after the calcium treatment, the molten steel is subjected to soft blowing treatment before the LF refining exits the station, and the soft blowing time is controlled at 15 minutes;

[0030] (2) RH refinin...

Embodiment 3

[0034] In this embodiment, the high-carbon chromium bearing steel steel grade is GCr15SiMn. The method for solving the clogging of the pouring nozzle of the high-carbon chromium bearing steel produced by the billet continuous casting machine includes LF refining, RH refining, and continuous casting processes. The specific process steps are as follows:

[0035](1) LF refining process: Aluminum products are added in the early stage of LF refining, and the aluminum content of molten steel is controlled at 0.039wt%. Calcium treatment is performed in the middle stage of LF refining. The amount of calcium wire added is 0.18kg / t steel, and the Ca content of molten steel is controlled at 0.0019wt%. , the sulfur content of the molten steel component before calcium treatment is 0.008wt%; after the calcium treatment, the molten steel is subjected to soft blowing treatment before the LF refining exits the station, and the soft blowing time is controlled at 10 minutes;

[0036] (2) RH refin...

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Abstract

The invention discloses a method for solving blockage of a pouring nozzle of a billet caster producing high carbon chromium bearing steel. The method includes LF refining, RH refining and a casting process. According to the method, calcium treatment operation is carried out in the middle of the LF refining. Calcium line addition is 0.10-0.35 kg / t steel. The content of molten steel Ca is controlledwithin 0.0010-0.0025 wt %. The sulfur content of the molten steel is less than or equal to 0.010 wt % before calcium treatment, otherwise the calcium treatment is delayed. Aluminum products are not added into the molten steel in the later period of the LF refining and the RH process. A slab section of the billet caster is less than or equal to 260mm*260mm. A tundish nozzle is an immersion nozzle,and an argon blowing stopper with holes is not needed to be used. The method solves the technical problems troubling the billet caster producing high carbon chromium bearing steel for a long time that the immersion nozzle is likely to be plugged, causing the billet caster to have accidents to stop pouring, the molten steel to return to a furnace or falls to the ground. The method reduces the production cost, improves the benefit of an enterprise and has excellent promotion and application value.

Description

technical field [0001] The invention belongs to the technical field of billet continuous casting production technology, and in particular relates to a method for solving the clogging of a pouring nozzle of a billet continuous casting machine for producing high-carbon chromium bearing steel. Background technique [0002] As an indispensable process in the modern iron and steel metallurgical production process, continuous casting plays a decisive role in maintaining the continuity of the entire production process and improving the production efficiency and product quality of iron and steel enterprises. The billet continuous casting machine produces high-carbon chromium bearing steel, which has high requirements for the quality of molten steel and the protective pouring of the continuous casting machine. GB / T 18254-2016 stipulates that the high-grade high-quality bearing steel Ca≤0.0010wt%. [0003] In order to ensure that the calcium content of the bearing steel does not excee...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/00C21C7/10B22D11/18B22D11/111
CPCB22D11/111B22D11/18C21C7/0056C21C7/10
Inventor 宋依新段永卿师艳秋杨之俊刘志国杨海滨陈晓辉
Owner HANDAN IRON & STEEL GROUP
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