Deoxidation control method for molten steel of bearing steel without Ds-type inclusions

A control method and inclusion technology, which is applied in the field of removing high-carbon chromium bearing steel Ds-type inclusions and the control field of inclusions in the smelting process of bearing steel, can solve the problems of difficulty and effective control, and achieve the solution of castability time, prevention of The formation of Ds inclusions and the effect of promoting effective removal

Inactive Publication Date: 2018-12-21
ZENITH STEEL GROUP CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This process has good desulfurization and deoxidation effects, and at the same time, through strict control of the Al content of the molten steel and the CaO / Al content in the slag 2 o 3 Control the content of D-type inclusions in steel; but this process is similar to that of Sanyo Special Steel in Japan, without strict control and RH vacuum chamber slag-free operation, it is difficult to effectively control Ds non-metallic inclusions in steel

Method used

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  • Deoxidation control method for molten steel of bearing steel without Ds-type inclusions
  • Deoxidation control method for molten steel of bearing steel without Ds-type inclusions
  • Deoxidation control method for molten steel of bearing steel without Ds-type inclusions

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Experimental program
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Effect test

Embodiment 1

[0021] The deoxidation control method for controlling the absence of Ds-type inclusions in high-carbon chromium bearing steel of the present invention adopts the following specific processes. The main components of high-carbon chromium bearing steel are: C: 0.95-1.02%, Si: 0.18-0.28%, Mn: 0.3-0.4%, Cr: 1.4-1.55%, Al: 0.005-0.015%, Ti≤0.002%; Ca ≤0.001%.

[0022] 1. LF refining process: including tapping alloying to LF treatment position pre-deoxidation slagging process and LF treatment process.

[0023] (1) The process of tapping and alloying to LF treatment position pre-deoxidation and slag formation: 120t top-bottom combined blowing converter The composition of molten iron in the furnace is: C: 4.9%, Si: 0.37%, Mn: 0.088%, P: 0.118%, Ti : 0.041%; smelting end point C: 0.13%, P: 0.014%, S: 0.007%, when the end point temperature is 1630℃, the steel begins to tap, and when 1 / 4 of the steel is tapped, 115kg of silicon carbide, 335kg of low-carbon ferromanganese, and low-carbon ...

Embodiment 2

[0034] 1. LF refining process: including tapping alloying to LF treatment position pre-deoxidation slagging process and LF treatment process.

[0035] (1) The process of tapping and alloying to the LF treatment position for pre-deoxidation and slag formation: the composition of molten iron entering the converter is: C: 4.8%, Si: 0.38%, Mn: 0.083%, P: 0.114%, Ti: 0.039%;

[0036] Smelting end point C: 0.12%, P: 0.013%, S: 0.008%. Tapping begins when the end point temperature is 1621°C. After tapping for 1.5 minutes, add 100kg of silicon carbide, 334kg of low-carbon ferromanganese, 2145kg of low-titanium and high-carbon ferrochrome, Low-aluminum and low-titanium ferrosilicon 209kg, low-nitrogen carburizer 925kg; slag lime 405kg, fluorite 154kg; total tapping time 5.5min, bottom blowing argon in the whole tapping process, argon blowing flow rate is 550Nm 3 / h.

[0037] (2) LF treatment process: the main components of the first sample to refining are as follows: C: 0.85%, Si: 0.1...

Embodiment 3

[0045] 1. LF refining process: including tapping alloying to LF treatment position pre-deoxidation slagging process and LF treatment process.

[0046] (1) The process of tapping and alloying to LF treatment position pre-deoxidation and slag formation: the composition of molten iron entering the converter is: C: 4.3%, Si: 0.45%, Mn: 0.075%, P: 0.103%. Ti: 0.035%; smelting end point C: 0.13%, P: 0.012%, S: 0.008%. Tapping begins when the end point temperature is 1626°C. After tapping for 1min40s, add 100kg of silicon carbide, 332kg of low-carbon ferromanganese, low-titanium and high-carbon 2134kg of ferrochrome, 205kg of low-aluminum and low-titanium ferrosilicon, 903kg of low-nitrogen recarburizer; 410kg of slag lime, 150kg of fluorite; the total time of tapping is 6 minutes, and the bottom blowing argon during the whole tapping process is 546Nm 3 / h.

[0047] (2) LF treatment process: the main components of the first sample until refining are as follows: C: 0.90%, Si: 0.22%, ...

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Abstract

The invention discloses a control method for inclusions in bearing steel in the smelting process. The Ds-type inclusions in the bearing steel can be removed thoroughly, and the fatigue life of the bearing steel is prolonged. According to the control method for the inclusions in the bearing steel in the smelting process, a high-carbon-chromium bearing is produced through the converter procedure, the LF procedure, the RH procedure and the CC procedure, and deoxidation is conducted through silicon carbide instead of aluminum in the steel tapping process of a converter; low-alkalinity refining slag is manufactured in the LF refining process, the slag surfaces are deoxidized through the silicon carbide with high purity, thus free CaO in the slag is reduced, and forming of the Al2O3 inclusions in molten steel is reduced; and high-vacuum circulation and long-time soft blowing are conducted in the RH refining process, and thus the purpose of removing the Ds-type inclusions in the bearing steelthoroughly is achieved. As for the high-carbon-chromium bearing steel produced by implementing the control method, the total oxygen content is less than or equal to 0.0010% while the Ds-type inclusions in the steel are removed thoroughly.

Description

technical field [0001] The invention relates to the field of bearing steel smelting in the iron and steel metallurgy industry, in particular to a method for controlling inclusions in the bearing steel smelting process, in particular to a method for removing high-carbon chromium bearing steel Ds inclusions. Background technique [0002] High-carbon chromium bearing steel is often used to manufacture balls, rollers and bearing rings and other components. With the development of modern science and technology, higher requirements are put forward for the life, stability and reliability of bearings. However, in bearing steel The inclusions destroy the continuity of the matrix and produce stress concentration, which becomes the source of cracks for bearing spalling, which has a great impact on the performance of the bearing, especially the contact fatigue life. [0003] According to GB / T 10561-2005 "Determination Standard Grading Chart Microscopic Examination Method for Non-metalli...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/06C21C7/10
CPCC21C7/06C21C7/10
Inventor 孙光涛黄永生赵阳安航航王向红王海阳莫秉干
Owner ZENITH STEEL GROUP CORP
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