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Preparation method of high-purity wind power fastener

A technology of purity and fasteners, applied in the field of preparation of high-purity wind power fasteners, can solve the problems affecting the stability and service life of fasteners, difficult to control, etc., to reduce H and O content, improve Product quality and stable use

Inactive Publication Date: 2019-03-01
NANJING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] A super-large high-strength fastener steel and its production method (Patent No. 201710489759.4) mainly introduces a production mode of high-strength fasteners through the converter-LF-continuous casting-rolling route. Its characteristics are simple production organization requirements, through Control the continuous casting casting speed and rolling process to achieve the production method of steel for super large fasteners. The disadvantage of this method is that it is difficult to control the gas elements and inclusions such as O and H in the steel, which will affect the quality of fastener products. Stability and service life

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] The preparation method of the high-purity wind power fastener provided in this embodiment includes the following steps:

[0016] (1) Hot metal pretreatment (not necessary), can be adjusted according to the molten iron into the furnace (such as hot metal S ≤ 0.025% without desulfurization): reduce the burden of desulfurization in the LF treatment process, and improve the purity of molten steel;

[0017] (2) Converter smelting control: the end point control C is 0.184% (or the oxygen level of tapping TSO is 400ppm), the tapping temperature is 1560°C, and the oxygen level is strictly controlled to create good conditions for the subsequent process;

[0018] (3) Converter tapping control:

[0019] a. Control the bottom stirring of the converter before tapping to further reduce the oxidation of molten steel and the P content in steel;

[0020] b. Control of slag removal: slag dumping before the converter is tapped, and a double block method of sliding plate + slag blocking c...

Embodiment 2

[0026] The preparation method of the high-purity wind power fastener provided in this embodiment includes the following steps:

[0027] (1) Hot metal pretreatment (not necessary), can be adjusted according to the molten iron into the furnace (such as hot metal S ≤ 0.025% without desulfurization): reduce the burden of desulfurization in the LF treatment process, and improve the purity of molten steel;

[0028] (2) Converter smelting control: the end point control C is 0.085% (or the oxygen level of tapping TSO is 350ppm), the tapping temperature is 1600°C, and the oxygen level is strictly controlled to create good conditions for the subsequent process;

[0029] (3) Converter tapping control:

[0030] a. Control the bottom stirring of the converter before tapping to further reduce the oxidation of molten steel and the P content in steel;

[0031] b. Control of slag removal: slag dumping before the converter is tapped, and a double block method of sliding plate + slag blocking c...

Embodiment 3

[0037] The preparation method of the high-purity wind power fastener provided in this embodiment includes the following steps:

[0038] (1) Hot metal pretreatment (not necessary), can be adjusted according to the molten iron into the furnace (such as hot metal S ≤ 0.025% without desulfurization): reduce the burden of desulfurization in the LF treatment process, and improve the purity of molten steel;

[0039] (2) Converter smelting control: the end point control C is 154% (or the tapping TSO oxygen level is 400ppm), the tapping temperature is 1560°C, and the oxygen level is strictly controlled to create good conditions for the subsequent process;

[0040] (3) Converter tapping control:

[0041] a. Control the bottom stirring of the converter before tapping to further reduce the oxidation of molten steel and the P content in steel;

[0042] b. Control of slag removal: slag dumping before the converter is tapped, and a double block method of sliding plate + slag blocking cone (...

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PUM

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Abstract

The invention discloses a preparation method of a high-purity wind power fastener. The preparation method of the high-purity wind power fastener comprises the following steps: (1) converter smelting:controlling the percentage by mass of C to be greater than or equal to 0.06% or controlling steel tapping TSO oxygen site to be less than or equal to 400 ppm at an end point, and enabling a steel tapping temperature to be greater than or equal to 1560 DEG C; (2) converter steel tapping: a, bottom stirring; and b, slag discharging; (3) deoxidization alloying: in the earlier stage of steel tapping,adding a carburant and carrying out preliminary deoxidation, sequentially adding alloy, a deoxidizing agent and slag, and maintaining argon blowing in the whole process in an alloying process; (4) LFtreatment: controlling the percentages of mass of inclusions in steel as follows: 50-60% of CaO and 15-25% of Al2O3, controlling the alkalinity of final slag to be 3-6, carrying out composite diffuseddeoxidation by using SiC, aluminum particles, silicon, aluminum and calcium and a deoxidizing slag former in a power supply smelting process, and ensuring the total mass percentage of TFe and MnO tobe less than or equal to 1%; (5) RH treatment: controlling vacuum degree to be 2.5 millibars or below, and maintaining for 0-5 min, enabling high vacuum maintaining time to be greater than or equal to8 min, carrying out calcium treatment after feeding an aluminum line for 1-2 min, and after calcium treatment, carrying out soft blowing for 10 min or above; and (6) carrying out continuous casting.

Description

technical field [0001] The invention relates to a production method of mechanical parts, in particular to a production method of high-purity wind power fasteners. Background technique [0002] A super-large high-strength fastener steel and its production method (Patent No. 201710489759.4) mainly introduces a production mode of high-strength fasteners through the converter-LF-continuous casting-rolling route. Its characteristics are simple production organization requirements, through Control the continuous casting casting speed and rolling process to achieve the production method of steel for super large fasteners. The disadvantage of this method is that it is difficult to control the gas elements and inclusions such as O and H in the steel, which will affect the quality of fastener products. Stability and service life. The total oxygen content of fasteners produced by the converter-LF-continuous casting process mode is generally 20-25ppm, and it can be controlled below 20p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C5/28C21C7/06C21C7/10C21C7/00B22D11/16
CPCB22D11/16C21C5/28C21C7/0006C21C7/06C21C7/10
Inventor 周杨胡志勇鲁川陈鹏涛刘义韦士琨
Owner NANJING IRON & STEEL CO LTD
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