Method for controlling effective vacuum treatment time in RH smelting process
A technology of vacuum treatment and smelting process, which is applied in the field of metallurgy, can solve problems such as deterioration of inclusions, and achieve the effect of reducing the number
Pending Publication Date: 2022-06-24
SD STEEL RIZHAO CO LTD
View PDF4 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
However, when the RH treatment time exceeds a certain range, the inclusions in molten steel tend to deteriorate
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
example 1
[0026] The furnace number is 2147017, the grade is Q550D, and the order size is 12000×2500×40 / 60mm.
[0027] 1. After the molten steel reaches RH, it starts to vacuumize;
[0028] 2. When the vacuum degree of the vacuum system reaches 200pa, start timing;
[0029] 3. When the timing time is 3 minutes, determine the hydrogen 1 and take the inclusion sample 1 at the same time. At this time, the vacuum degree of the system is 87pa;
[0030] 4. When the timing time is 6 minutes, hydrogen 2 is determined, and inclusion sample 2 is taken at the same time. At this time, the vacuum degree of the system is 69pa;
[0031] 5. When the timing time is 9 minutes, hydrogen 3 is determined, and inclusion sample 3 is taken at the same time. At this time, the vacuum degree of the system is 69pa;
[0032] 6. The hydrogen determination value and inclusion analysis results in different time periods are as follows:
[0033]
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention belongs to the technical field of metallurgy, and particularly relates to a method for controlling effective vacuum treatment time in an RH smelting process, which comprises the following steps of: starting timing when the vacuum degree of an RH vacuum system reaches 200pa under the general vacuumizing condition that the lifting gas flow is 120-160NL / min, continuously vacuumizing and degassing for 6-7 minutes, and stopping vacuumizing. In the vacuumizing treatment process, the content of inclusions in the unit area of the steel is in the trend of firstly decreasing and then increasing, and when degassing is continued for 6-7 minutes after the vacuum degree of a vacuum system reaches 200 pa, the content of the inclusions in the steel is the minimum. The RH smelting effective vacuum time (after the vacuum degree reaches 200 pa) is controlled within 6-7 minutes, the number of inclusions in the molten steel can be effectively reduced, a basis is provided for cleanliness control in the molten steel smelting process, and meanwhile the hydrogen content in the steel can meet the requirement under the condition.
Description
technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a method for controlling the effective vacuum treatment time of an RH smelting process. Background technique [0002] As an important part of the current steelmaking process, RH is very important for the smelting of various types of steel from the perspective of molten steel cleanliness, especially the production of thick plates and extra-thick plates. The role of RH vacuum degassing is increasingly prominent. [0003] In the steelmaking process, the main function of RH vacuum degassing is to remove the hydrogen in the steel, so as to reduce the defects and problems such as internal hydrogen-induced cracks, flaw detection, and steel plate delamination caused by hydrogen in the steel. The ability of RH vacuum dehydrogenation is proportional to the hydrogen concentration in the steel. The greater the hydrogen concentration, the stronger the dehydrogenation ability; o...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/10
CPCC21C7/10
Inventor 刘建伟王学新赵友虎薛燕赵珉李世良吴计雨苏堂堂孙金明郑九刚刘同堂王建波任长松
Owner SD STEEL RIZHAO CO LTD