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Preparation method of sulfur-containing steel for engineering machinery

A technology for construction machinery and molten steel, which is applied in the field of preparation of sulfur-containing construction machinery steel, can solve the problems of complex preparation method of sulfur-containing steel, large consumption of iron and steel materials, and high requirements for comprehensive production coordination, and achieves a simple and controllable preparation process, The effect of reducing defects such as low recovery rate and porosity

Inactive Publication Date: 2020-06-09
NANJING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Purpose of the invention: The purpose of the invention is to provide a method for preparing sulfur-containing steel for construction machinery, which solves the problems of complex preparation methods for sulfur-containing steel, high requirements for comprehensive production coordination and large consumption of steel materials

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A kind of preparation method of sulfur-containing engineering machinery steel of the present invention comprises the following steps:

[0022] (1) Converter smelting: The molten iron pre-desulfurization process is not carried out before the converter smelting process to ensure that there is a sufficient amount of residual sulfur in the molten iron after converter smelting. Bit 344ppm), tapping temperature 1617℃;

[0023] (2) Converter tapping: Turn on the bottom stirring of the converter before tapping the molten steel to reduce the oxidation of molten steel and the P content of the molten steel, and pour slag before tapping the converter; add 15kg of high-purity graphite in the early stage of tapping for pre-deoxidation, and then sequentially Add ferrosilicon (25kg), ferromanganese (high-carbon ferromanganese 633kg, silicon manganese 1065kg), aluminum block (110kg) and lime 516kg, compound refining slag 319kg for deoxidation alloying, compound refining slag is CaO: 40-...

Embodiment 2

[0028] A kind of preparation method of sulfur-containing engineering machinery steel of the present invention comprises the following steps:

[0029] (1) Converter smelting: The molten iron pre-desulfurization process is not carried out before the converter smelting process to ensure that the molten iron has a sufficient amount of residual sulfur after converter smelting. Bit 307ppm), tapping temperature 1606℃;

[0030] (2) Converter tapping: Turn on the bottom stirring of the converter before tapping the molten steel to reduce the oxidation of molten steel and the P content of the molten steel, and pour slag before tapping the converter; add 18kg of high-purity graphite in the early stage of tapping for pre-deoxidation, and then sequentially Add ferrosilicon (67kg), ferrochromium (183kg), ferromanganese (silicon manganese 1019kg), aluminum block (80kg) and lime 475kg, compound refining slag 422kg for deoxidation alloying, compound refining slag is CaO: 40-55%, SiO 2 ≤10%, A...

Embodiment 3

[0035] A kind of preparation method of sulfur-containing engineering machinery steel of the present invention comprises the following steps:

[0036] (1) Converter smelting: The molten iron pre-desulfurization process is not carried out before the converter smelting process to ensure that the molten iron has a sufficient amount of residual sulfur after converter smelting. Bit 180ppm), tapping temperature 1625℃;

[0037] (2) Converter tapping: Turn on the bottom stirring of the converter before tapping the molten steel to reduce the oxidation of molten steel and the P content of the molten steel, and pour slag before tapping the converter; add 15kg of C powder in the early stage of tapping for pre-deoxidation, and then sequentially add silicon Manganese (1321kg), aluminum block (80kg) and lime 514kg, compound refining slag 431kg for deoxidation alloying, compound refining slag is CaO: 40-55%, SiO 2 ≤10%, Al 2 o 3 : 35~50%, MgO≤8%, keep argon blowing throughout the process of...

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Abstract

The invention discloses a preparation method of sulfur-containing steel for engineering machinery. The preparation method comprises the following steps that (1), converter smelting is carried out, specifically, a molten iron pre-desulfurization procedure is not carried out before the converter smelting process, and in the converter smelting process, the mass percentage content of C at the end point of a converter is controlled to be greater than or equal to 0.06% or the tapping oxygen level is controlled to be less than or equal to 400ppm, and the tapping temperature is controlled to be greater than or equal to 1560 DEG C; and (2), converter tapping is carried out, specifically, converter bottom stirring is started before molten steel tapping, the oxidability and the P content of molten steel are reduced, and deslagging is carried out before converter tapping, a carburant is added for pre-deoxidation in the early stage of tapping, then an alloy, a deoxidizing agent and slag charge aresequentially added for deoxidation alloying, argon blowing is kept in the whole deoxidation alloying process, and a double-gear mode is adopted for tapping in the later stage of tapping. According tothe preparation method, the content of sulfur in the steel can be stably controlled, the preparation process is simple and controllable, and by placing the slagging-off treatment in the converter tapping stage, the situation that after the slagging-off treatment is placed in the LF treatment, part of steel and iron materials are lost is prevented.

Description

technical field [0001] The invention belongs to the technical field of steel production, and in particular relates to a preparation method of steel for engineering machinery containing sulfur. Background technique [0002] In order to solve the cutting performance of some steel grades, more and more special-purpose steel grades choose to use S to solve the cutting performance, especially steel for engineering machinery, the representative grade is 35MnB series, such steel grades are usually aluminum deep deoxidized steel grades, smelting Calcium treatment is required to spheroidize the Al2O3 inclusions in the steel to improve the castability of molten steel. However, after S is added to the steel, Ca combines with S in molten steel to form CaS with a high melting point during calcium treatment, which is more likely to cause blockage of the nozzle during the casting process and affect Production is going smoothly, and all iron and steel enterprises are exploring the optimizat...

Claims

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Application Information

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IPC IPC(8): C21C7/00C21C7/06C21C7/10C21C5/28C22C38/02C22C38/04C22C38/06C22C38/42C22C38/44C22C38/50C22C38/54
CPCC21C5/28C21C7/0006C21C7/0025C21C7/06C21C7/10C22C38/002C22C38/02C22C38/04C22C38/06C22C38/42C22C38/44C22C38/50C22C38/54
Inventor 周杨胡志勇鲁川陈鹏涛刘义许旭东韦士琨周士北
Owner NANJING IRON & STEEL CO LTD
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