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A smelting process of gear steel containing aluminum and sulfur

A gear steel and process technology, applied in the field of metallurgy, can solve the problems of easily exceeding the standard of oxygen content and non-metallic oxygen content of steel, inability to achieve continuous casting of multiple furnaces, affecting the quality of molten steel and scrapping, etc., so as to reduce harmful residual elements and prevent nozzle formation. tumor, ensure the effect of antegrade

Active Publication Date: 2016-07-13
ZENITH STEEL GROUP CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, due to the large amount of aluminum, titanium, and sulfur used, the castability of molten steel is poor, continuous casting in multiple furnaces cannot be realized, the surface quality of steel slabs is also poor, and the oxygen content and non-metallic oxygen content of steel are also likely to exceed the standard, which affects the quality of molten steel and increases a lot of scrap. Seriously affected production cost control

Method used

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Examples

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Embodiment Construction

[0024] A smelting process of gear steels containing aluminum and sulfur, taking the production of 20MnCrS5 gear steel as an example to illustrate:

[0025] Production process: blast furnace molten iron (90%) + scrap steel (10%) - 100 tons of electric furnace - 100 tons of ladle refining furnace (LF) - 100 tons of vacuum furnace (VD) - 5 machines and 5 strands of continuous casting machine (220mm × 260mm rectangular billet ).

[0026] Electric furnace smelting process

[0027] 1. The electric furnace adopts blast furnace molten iron + scrap steel. The hot charging ratio of molten iron accounts for 90%. The carbon content at the end of the electric furnace is controlled above 0.06%. 2 o 3 Such inclusions can effectively control the oxygen content and inclusion content in steel.

[0028] 2. Add 600kg of lime and 400kg of low-Si refining agent to the electric furnace tapping until the Si content in the refining furnace is less than 0.03%.

[0029] 3. When tapping, add 100 kg o...

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PUM

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Abstract

The invention discloses an aluminum-containing and sulfur-containing series gear steel smelting process. Liquid iron is required to contain 0.20-0.50% of Si, less than or equal to 0.035% of S, and less than or equal to 0.110% of P, and at a temperature T greater than or equal to 1250 DEG C; lime for an electric furnace and refining is required to contain greater than or equal to 90% of CaO and less than or equal to 1.2% of SiO2, and has the activity degree of greater than or equal to 300 and the granularity of 10-40mm; a low-silicon refining agent is required to contain greater than or equal to 45% and less than or equal to 55% of CaO, less than or equal to 2.0% of SiO2, and greater than or equal to 35% and less than or equal to 40% of Al2O3. The liquid iron hot charge ratio of the electric furnace reaches up to 90%; for LF refining, a first strong and later weak deoxidization manner is adopted; at the middle-late stages, a weak deoxidizer is adopted for furnace slag maintenance to realize further deoxidization. Meanwhile, deoxidization and S removal are performed, and then an S wire is fed to obtain a certain S content; in addition, the S wire is allowed to be fed only in more than 5 minutes after the denaturalization treatment of feeding a calcium-iron wire into VD liquid steel, and therefore, the formation of CaS inclusion in a clogging material at other water gap is prevented; and at last, the castability of the liquid steel is guaranteed while excellent structural properties of the steel product are obtained, and the purity of the liquid steel is improved.

Description

technical field [0001] The invention belongs to the field of metallurgy and relates to a steel smelting process, in particular to an aluminum-sulfur-containing gear steel smelting process. Background technique [0002] Aluminum-containing and sulfur-containing series gear steel, which belongs to carburizing steel, has high strength and toughness, and good hardenability. The properties obtained after heat treatment are better than 20Cr. Small quenching deformation, good low temperature toughness, good machinability. It is generally used after carburizing and quenching or tempering. It is used to manufacture and heavy-duty quenched and tempered parts with large cross-section and carburized parts with small cross-section. It can also be used to manufacture small and medium-sized parts with medium load and less impact. It can be used instead of 20CrNi, such as gears, shafts, main shafts, and friction wheels of transmission equipment. , worm, governor sleeve, etc. The main st...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C5/52C21C7/06C21C7/064C21C7/04C21C7/072
CPCY02P10/20
Inventor 邓向阳
Owner ZENITH STEEL GROUP CORP
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