A method for smelting low-phosphorus and low-sulfur molten steel in a converter
A converter smelting and converter blowing technology is applied in the field of converter smelting molten steel and converter smelting low-phosphorus and low-sulfur molten steel. Effect
Active Publication Date: 2018-06-26
SHANGHAI MEISHAN IRON & STEEL CO LTD
View PDF10 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
[0005] The purpose of the present invention is to provide a method for smelting low-phosphorus and low-sulfur molten steel in a converter, which mainly solves the problem of w[P]≤0.0080% and w[S]≤0.0040% in the chemical composition of converter tapping molten steel produced by converter smelting in the prior art Difficult technical issues
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
Embodiment Construction
[0028] The present invention will be further illustrated below in conjunction with specific embodiments, and it should be understood that the following specific embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention.
[0029] In the examples shown in Table 1 to Table 5, taking a 150-ton top-bottom combined blowing converter to smelt SEDDQ-1 automobile inner plate steel as an example, the bottom blowing gas in the converter smelting process is argon, and the specific operations are as follows:
[0030] Table 1 Proportion and composition of converter smelting metal material and slagging auxiliary material of the present invention
[0031]
[0032]Table 2 Process parameters of converter smelting desiliconization and dephosphorization stages of the present invention
[0033]
[0034] Table 3 Process parameters of slag dumping in the early stage of converter smelting according to the present invention
...
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 discloses a method for smelting low-phosphor and low-sulfur molten steel with a converter. The technical problem that in the prior art, the requirements that w[P]<=0.0080% and w[S]<=0.0040% in the chemical components of converter tapping molten steel smelted and produced through the converter are difficult to meet is solved. According to the technical scheme, the method for smelting low-phosphor and low-sulfur molten steel with the converter includes the steps that waste steel is added, and molten iron is mixed in; bessemerizing is carried out for desilicication and dephosphorization, and pre-slag is discharged; bessemerizing is carried out for decarbonization; converter tapping is carried out; and slag-splashing for protection of the converter and slag pouring are carried out. By limiting the ratio of converter metal materials to slagging accessories and the sulphur content, bessemerizing is adopted for control over the desilicication and dephosphorization period and the decarbonization period, and the dephosphorization and desulfuration capacity in each stage of the converter is played. Through the early-stage slag discharging process and a method for controlling the slag discharging rate, melting meeting the requirements that w[P]<=0.0080% and w[S]<=0.0040% in the chemical components of converter tapping molten steel is realized. The method is stable in process, and lowers production cost.
Description
technical field [0001] The invention relates to a method for smelting molten steel in a converter, in particular to a method for smelting low-phosphorus and low-sulfur molten steel in a converter, and belongs to the technical field of converter steelmaking. Background technique [0002] Phosphorus and sulfur are harmful elements in most steel types. In recent years, some steel grades have placed high demands on the elements phosphorus and sulfur at the same time. Such as automobile body outer plate steel, it is generally required that w[P]≤0.010% and w[S]≤0.0060% in steel. At present, the representative production method of low-phosphorus and low-sulfur steel is deep dephosphorization in converter, and then deep desulfurization in LF furnace. The disadvantage of this process is that the low-phosphorus and low-nitrogen molten steel smelted by the converter will be polluted during the deep desulfurization treatment of the LF furnace. . Therefore, the phosphate in the ladle...
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 Patents(China)
IPC IPC(8): C21C5/35
Inventor 王多刚虞大俊左康林郑毅孙晓辉
Owner SHANGHAI MEISHAN IRON & STEEL CO LTD