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Production method of aluminum-free bearing steel

A production method and technology of aluminum bearings, which are applied in the field of metallurgy, can solve problems such as the quality of clogged molten steel, the inner diameter of the nozzle becomes smaller, and the pourability of molten steel is low, so as to solve the problem of castability, improve castability, and improve the quality of finished products. rate effect

Pending Publication Date: 2022-05-03
ZENITH STEEL GROUP CORP +1
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0003] The technical problem to be solved by the present invention is: in order to overcome the low pourability of molten steel due to RH vacuum treatment of aluminum-killed bearing steel in the prior art, the secondary oxidation of continuous casting and the precipitation of dissolved oxygen in molten steel with the drop of process temperature to produce endogenous inclusions In the casting process, it is attached to the inner wall of the nozzle to make the inner diameter of the nozzle smaller until it is blocked. During the process, the blockage is prone to irregular shedding and affects the quality of molten steel. A production method for aluminum-free bearing steel is provided.

Method used

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  • Production method of aluminum-free bearing steel

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Effect test

Embodiment 1

[0032] (1) After the steel scrap and desulfurized hot metal are decarburized, dephosphorized, carbon-preserved and heated up in the primary smelting furnace, the steel is tapped, and the target carbon content is controlled above 0.15%;

[0033] (2) The tapping process uses low-aluminum and low-titanium alloys for tapping alloying;

[0034] (3) Use sliding plate to stop slag in converter tapping;

[0035] (4) Molten steel is hoisted to refining using low-aluminum and low-titanium ferrosilicon, high-purity silicon carbide, and metal manganese for enhanced deoxidation alloying operations, and the basicity of the slag is controlled at 1.8;

[0036] (5) Add quartz sand after controlling the element composition to meet the process requirements and oxygen content requirements, and the alkalinity of the slag is reduced to 1.2;

[0037] (6) The high vacuum pressure holding time is controlled at 28 minutes, and soft blowing is performed until continuous casting after air breaking;

[...

Embodiment 2

[0041] (1) After the steel scrap and desulfurized hot metal are decarburized, dephosphorized, carbon-preserved and heated up in the primary smelting furnace, the steel is tapped, and the target carbon content is controlled above 0.15%;

[0042] (2) The tapping process uses low-aluminum and low-titanium alloys for tapping alloying;

[0043] (3) Use sliding plate to stop slag in converter tapping;

[0044] (4) Molten steel is hoisted to refining using low-aluminum and low-titanium ferrosilicon, high-purity silicon carbide, and metal manganese for enhanced deoxidation alloying operations, and the basicity of the slag is controlled at 1.9;

[0045] (5) Add quartz sand after controlling the element composition to meet the process requirements and oxygen content requirements, and the alkalinity of the slag is reduced to 1.1;

[0046] (6) The high-vacuum holding time is controlled at 32 minutes, and soft blowing is carried out to continuous casting after breaking the air;

[0047] ...

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Abstract

The invention relates to the technical field of metallurgy, in particular to a production method of aluminum-free bearing steel, which comprises the following specific steps of: (1) decarbonizing and dephosphorizing waste steel and desulfurized molten iron by a primary smelting furnace, keeping carbon, heating, and tapping; (2) in the tapping process, aluminum is not added for deoxidation, and a low-aluminum low-titanium alloy is added for deoxidation and alloying; (3) a sliding plate is used for stopping slag after tapping is finished; (4) 40 min before refining, the basicity of slag is controlled to be 1.5-2.0; (5) refining for 40 minutes, adding quartz sand to control the alkalinity of the slag to 1.0-1.3, and hoisting to an RH vacuum furnace for vacuum treatment after the temperature is controlled; (6) carrying out high-vacuum pressure maintaining, carrying out vacuum breaking, carrying out constant-oxygen soft blowing, and carrying out continuous casting; and (7) the molten steel is subjected to low-aluminum refractory protective casting to produce qualified continuous casting billets, the castability of the bearing steel is improved, and the yield of the bearing steel is increased.

Description

technical field [0001] The invention relates to the technical field of metallurgy, in particular to a production method of aluminum-free bearing steel. Background technique [0002] In the field of metallurgy, aluminum deoxidation has been used in the production of bearing steel to achieve the purpose of quality control. However, due to the low castability of molten steel after RH vacuum treatment of aluminum-killed bearing steel, the secondary oxidation of continuous casting and the precipitation of dissolved oxygen in molten steel decrease with the process temperature Endogenous inclusions are generated, which are attached to the inner wall of the nozzle during the casting process to reduce the inner diameter of the nozzle until it is blocked. During the process, the blockage is prone to irregular shedding and affects the quality of molten steel. Contents of the invention [0003] The technical problem to be solved by the present invention is: in order to overcome the lo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/10C21C1/02C21C7/00C21C7/06C21C7/064C21C7/068
CPCC21C7/10C21C7/06C21C7/064C21C7/068C21C7/0006C21C1/02
Inventor 张正林蒋鲤平张建斌徐建飞许加陆
Owner ZENITH STEEL GROUP CORP
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