Method for controlling hydrogenation chrome molybdenum steel inclusions

A hydrogen-prone chromium-molybdenum and inclusion technology, applied in the field of hydrogen-prone chromium-molybdenum steel inclusion control, can solve the problems of reducing material plasticity, toughness and fatigue limit, anisotropy, cold and hot processing performance deterioration, etc., to achieve desulfurization Efficient and stable, reducing impurities and optimizing the casting process

Inactive Publication Date: 2018-07-20
WUYANG IRON & STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The main effect of inclusions on the mechanical properties and process properties of steel is to reduce the plasticity, toughne...

Method used

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  • Method for controlling hydrogenation chrome molybdenum steel inclusions
  • Method for controlling hydrogenation chrome molybdenum steel inclusions
  • Method for controlling hydrogenation chrome molybdenum steel inclusions

Examples

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Embodiment 1

[0019] The method for controlling inclusions in hydrogen-prone chromium-molybdenum steel in this embodiment includes converter smelting, vacuum carbon deoxidation, LF refining, VD vacuum treatment, and continuous casting of slabs. The specific process steps are as follows:

[0020] (1) Converter smelting process: Smelting is carried out by the compound blowing method of stirring with top-blown oxygen and bottom-blown argon. During the process, lime is added to form slag, and the slag is melted throughout the process to control the alkalinity of the slag; at the end of blowing, the molten steel [C]: 0.07%, [P]: 0.006%, [S]: 0.023%, [O]: 700ppm, blowing end temperature is 1620℃;

[0021] (2) Vacuum carbon deoxidation process: Converter tapping does not add alloys and pre-deoxidizers, ladle temperature is 1570°C, directly enters the vacuum position, increases carbon to 0.11% according to the carbon content of molten steel, and then carries out vacuum carbon deoxidation treatment f...

Embodiment 2

[0029] The method for controlling inclusions in hydrogen-prone chromium-molybdenum steel in this embodiment includes converter smelting, vacuum carbon deoxidation, LF refining, VD vacuum treatment, and continuous casting of slabs. The specific process steps are as follows:

[0030] (1) Converter smelting process: Smelting is carried out by the compound blowing method of stirring with top-blown oxygen and bottom-blown argon. During the process, lime is added to form slag, and the slag is melted throughout the process to control the alkalinity of the slag; at the end of blowing, the molten steel [C]: 0.06%, [P]: 0.007%, [S]: 0.030%, [O]: 600ppm, blowing end temperature is 1630℃;

[0031] (2) Vacuum carbon deoxidation process: no alloy and pre-deoxidizer are added to the converter, the temperature of the ladle is 1580°C, and it directly enters the vacuum position, and the carburization is increased to 0.12% according to the carbon content of the molten steel, followed by vacuum ca...

Embodiment 3

[0039] The method for controlling inclusions in hydrogen-prone chromium-molybdenum steel in this embodiment includes converter smelting, vacuum carbon deoxidation, LF refining, VD vacuum treatment, and continuous casting of slabs. The specific process steps are as follows:

[0040] (1) Converter smelting process: Smelting is carried out by the compound blowing method of stirring with top-blown oxygen and bottom-blown argon. During the process, lime is added to form slag, and the slag is melted throughout the process to control the alkalinity of the slag; at the end of blowing, the molten steel [C]: 0.08%, [P]: 0.005%, [S]: 0.028%, [O]: 700ppm, blowing end temperature is 1600℃;

[0041] (2) Vacuum carbon deoxidation process: no alloy and pre-deoxidizer are added to the converter, the temperature of the ladle is 1575°C, and it directly enters the vacuum position, and the carburization is increased to 0.13% according to the carbon content of the molten steel, followed by vacuum ca...

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Abstract

The invention discloses a method for controlling hydrogenation chrome molybdenum steel inclusions. The method comprises the procedures of converter smelting, vacuum carbon deoxidization, LF refining,VD vacuum treatment and slab continuous casting. According to the vacuum carbon deoxidization procedure, vacuum carbon deoxidization treatment is conducted for 7 min, argon is blown in the vacuum carbon deoxidization process at 100-200 L/min and stirring is conducted, and after the vacuum degree reaches 0.5 torr, vacuum is relieved, and a ladle is sampled and hung to an LF for refining. Accordingto the method for controlling the hydrogenation chrome molybdenum steel inclusions, one-time vacuum carbon deoxidization treatment is conducted before LF refining, so that the oxygen content in moltensteel is further reduced; the alkalinity of refining slag is controlled and good fluidity is kept so as to increase the possibility that the inclusions in the molten steel are adsorbed; the soft blowtime after VD is prolonged properly, and inclusion floating is promoted; and the argon is blown in a middle ladle before casting, air in the middle ladle is discharged, and the chance of secondary oxidation when the molten steel enters the middle ladle is reduced. According to the method for controlling the hydrogenation chrome molybdenum steel inclusions, impurities in the hydrogenation chrome molybdenum molten steel are effectively reduced, and thus the mechanical properties of a finished steel plate are improved.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a method for controlling inclusions in hydrogen-prone chromium-molybdenum steel. Background technique [0002] Hydrogen chromium molybdenum steel for pressure vessels is a low-carbon low-alloy steel with less alloy elements and excellent comprehensive mechanical properties. Plain steel, mainly used in oil refining and chemical industry, coal gasification and liquefaction, boilers and other industries, for the manufacture of heat exchangers, hydrogen equipment, liquefied gas tanks, liquefied petroleum gas cylinders, equipment and components in contact with hydrogen or hydrogen mixed media . This type of steel has high requirements on the purity of the steel, and impurity elements (P, S, Sb, Sn) and inclusions have a great influence on the mechanical properties and temper embrittlement of hydrogen-prone chromium-molybdenum steel, which seriously hinders the The app...

Claims

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Application Information

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IPC IPC(8): C21C7/06C21C7/10C21C5/35C21C7/064C21C7/072B22D1/00
CPCB22D1/002C21C5/35C21C7/0056C21C7/06C21C7/064C21C7/072C21C7/10
Inventor 王通邓建军李杰龙杰王九清庞辉勇肜玲华李惠勇莫德敏
Owner WUYANG IRON & STEEL
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