Smelting method of hot rolling round steel for 40 Cr alloy structure

A smelting method and structural technology, applied in the smelting field of hot-rolled round steel for 40Cr alloy structure, can solve the problems of nodulation, environmental pollution, and affecting the quality of steel, and achieve the effect of reducing energy consumption

Inactive Publication Date: 2015-10-07
武钢集团有限公司
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AI Technical Summary

Problems solved by technology

[0005] Due to the desulfurization in the LF refining furnace, the smelting cycle will be prolonged, the power consumption and the content of harmful gas N will be increased; the use of chromium drainage sand will cause environmental pollution; all use of silicon drainage sand will cause nodules and affect the steel quality

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  • Smelting method of hot rolling round steel for 40 Cr alloy structure

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Effect test

Embodiment 1

[0021] This embodiment is a hot-rolled round steel for 40Cr alloy structure, the finished product specification is φ25mm, and the S content is required to be 0.004wt%;

[0022] Its smelting steps:

[0023] 1) KR desulfurization is carried out after blast furnace smelting, and S is controlled at 0.0018wt%;

[0024] 2) Conventional converter smelting;

[0025] 3) Refining in LF furnace;

[0026] 4) Carry out continuous casting, in which Cr drainage sand is used for drainage in the pouring furnace, and the usage amount is added according to 0.29kg / ton of steel, and the pouring temperature should be 1562°C (the superheat is 62°C); the continuous pouring furnace adopts The amount of Si drainage sand drainage is added according to 0.29kg / ton of steel;

[0027] 5) Conventional hot rolling to the requirements.

[0028] After testing and statistics, the S in the end point molten steel is 0.0019wt%, the refining time of the LF furnace is 0.53 hours, the corresponding energy consumpt...

Embodiment 2

[0030] This embodiment is a hot-rolled round steel for 40Cr alloy structure, the finished product specification is φ28mm, and the S content is required to be 0.0035wt%;

[0031] Its smelting steps:

[0032] 1) KR desulfurization is carried out after blast furnace smelting, and S is controlled at 0.00175wt%;

[0033] 2) Conventional converter smelting;

[0034] 3) Refining in LF furnace;

[0035] 4) Carry out continuous casting, in which Cr drainage sand is used for drainage in the pouring furnace, and the usage amount is added according to 0.295kg / ton of steel, and the pouring temperature should be 1565°C (the degree of superheat is 65°C); the continuous pouring furnace uses Si Quality drainage sand drainage, its usage is added according to 0.295kg / ton of steel;

[0036] 5) Conventional hot rolling to the requirements.

[0037] After testing and statistics, the S in the end point molten steel is 0.0018wt%, the refining time of the LF furnace is 0.525 hours, the correspondi...

Embodiment 3

[0039] This embodiment is a hot-rolled round steel for 40Cr alloy structure, the finished product specification is φ32mm, and the S content is required to be 0.0032wt%;

[0040] Its smelting steps:

[0041] 1) KR desulfurization is carried out after blast furnace smelting, and S is controlled at 0.00172wt%;

[0042] 2) Conventional converter smelting;

[0043] 3) Refining in LF furnace;

[0044] 4) Carry out continuous casting, in which Cr drainage sand is used for drainage in the pouring furnace, and the usage amount is added according to 0.298kg / ton of steel, and the pouring temperature should be 1555°C (the degree of superheat is 55°C); the continuous pouring furnace uses Si Quality drainage sand drainage, its usage is added according to 0.298kg / ton of steel;

[0045] 5) Conventional hot rolling to the requirements.

[0046] After testing and statistics, the S in the end point molten steel is 0.0017wt%, the refining time of the LF furnace is 0.52 hours, the correspondin...

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Abstract

A smelting method of hot rolling round steel for a 40 Cr alloy structure comprises the steps that KR desulfuration is conducted after blast furnace smelting is conducted; common converter smelting is conducted; refining is conducted in an LF furnace; continuous casting is conducted, wherein Cr drainage sand is used for conducting draining in a cast-on furnace, and Si drainage sand is used for conducting draining in a continuous-casting furnace; common hot rolling is conducted until requirements are met. The sulphur content in the steel is reduced to 40 PPm or lower from the original 200 PPm; on the premise that it is guaranteed that the quality of the hot rolling round steel for the 40 Cr alloy structure is improved, the refining time of the LF furnace is shortened to 0.53 hour or less from the original 0.67 hour, and the energy consumption can be reduced by 15 percent or more.

Description

technical field [0001] The invention relates to a steelmaking method, in particular to a method for smelting hot-rolled round steel for 40Cr alloy structures. Background technique [0002] At present, in the process of smelting hot-rolled round steel for 40Cr alloy structure, in order to control the sulfur content in hot-rolled round steel for alloy structure, the method of pretreatment of molten iron by desulfurization by injection method is adopted, that is, low-sulfur steel is used in the smelting process. Lime, using high-quality refining slag in the LF refining furnace, and other measures. The existence of molten iron has poor effect in pretreatment desulfurization, so that the sulfur content is still relatively high, which leads to an increase in the desulfurization burden of the LF furnace, prolongs the smelting cycle, and increases the amount of harmful gases (N); the second is the inclusions in the steel If it cannot be fully floated, the quality of the steel will ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/064B22D41/44
Inventor 朱兆顺张渊普王建明黄红明曹立潮熊利敏万升余爱华饶水林
Owner 武钢集团有限公司
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