Unlock instant, AI-driven research and patent intelligence for your innovation.

Multifunctional composite refining agent for steel-smelting

A compound refining agent and alloy technology, which is applied in the field of refining molten steel when smelting high-quality molten steel with a refining agent for steelmaking, and can solve the inconvenience of production operation and management, the single function of the refining agent, and difficulty in exerting a greater effect, etc. problem, to achieve the effect of low cost and avoid secondary oxidation

Inactive Publication Date: 2009-09-30
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP +1
View PDF3 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this process reduces the FeO in the ladle slag, the S content in the finished steel reaches 0.005%-0.0012% (0.009% on average), and the T[O] content reaches 15×10 -6 ~34×10 -6 (average 24×10 -6 ) level, but submerged arc slag and refining agent are required to be used together during production, which is extremely inconvenient for production operation and management, and there is still a large gap between the T[O] content and the requirements of high-quality molten steel, and there is no report on inclusion control
[0006] In short, the current refining agent has a single function, and it is difficult to play a greater role in the production of high-quality steel

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 more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Multifunctional composite refining agent for steel-smelting
  • Multifunctional composite refining agent for steel-smelting
  • Multifunctional composite refining agent for steel-smelting

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The preparation of embodiment 1 refining agent of the present invention

[0024] Raw material: (by weight percentage)

[0025] CaO: 30%, CaC 2 : 5%, SiC: 10%, Na 2 CO 3 : 5%, CaCO 3 : 15%, C: 10%, CaF 2 : 15%, BaCaSi: 10%.

[0026]Preparation method: crush each raw material to 2-8mm respectively, weigh the weight of each raw material according to the proportion, put the weighed raw material into a dry mixing mixer, stir and mix for 20-30 minutes, and then put it into 20kg / bag Double-layer woven bag lined with plastic film. It should be protected from moisture and fire during transportation and storage.

[0027] ∑CaO / ∑SiO of the above-mentioned compound refining agent for steelmaking 2 It is 3.5, and its melting point is 1390°C.

[0028] The method of adding the compound refining agent for steelmaking is as follows: 2-4 kg / t steel of refining agent is added to the ladle during the tapping process of the converter, and 1-5 kg / t steel of the refining agent is adde...

Embodiment 2

[0029] The preparation of embodiment 2 refining agent of the present invention

[0030] Raw material: (by weight percentage)

[0031] CaO: 40%, CaC 2 : 10%, SiC: 10%, Na 2 CO 3 : 10%, CaCO 3 : 8%, C: 5%, CaF 2 : 15%, BaCaSi: 2%.

[0032] The preparation method is the same as in Example 1.

[0033] ∑CaO / ∑SiO of the above-mentioned compound refining agent for steelmaking 2 It is 4.0, and its melting point is 1360°C.

[0034] The method of adding the compound refining agent for steelmaking is as follows: 2-4 kg / t steel of refining agent is added to the ladle during the tapping process of the converter, and 1-5 kg / t steel of the refining agent is added into the ladle during the refining process of the LF furnace.

Embodiment 3

[0035] Embodiment 3 Preparation of refining agent of the present invention

[0036] Raw material: (by weight percentage)

[0037] CaO: 52%, CaC 2 : 5%, SiC: 8%, Na 2 CO 3 : 12%, CaCO 3 : 5%, C: 5%, CaF 2 : 9%, BaCaSi: 4%.

[0038] The preparation method is the same as in Example 1.

[0039] ∑CaO / ∑SiO of the above-mentioned compound refining agent for steelmaking 2 It is 5.5, and its melting point is 1370°C.

[0040] The method of adding the compound refining agent for steelmaking is as follows: 2-4 kg / t steel of refining agent is added to the ladle during the tapping process of the converter, and 1-5 kg / t steel of the refining agent is added into the ladle during the refining process of the LF furnace.

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

PropertyMeasurementUnit
melting pointaaaaaaaaaa
melting pointaaaaaaaaaa
melting pointaaaaaaaaaa
Login to View More

Abstract

The present invention proposes a multifunctional refining agent capable of effectively controlling inclusions in steel. The refining agent is composed of CaO, CaC2, SiC, Na2CO3, C, CaF2 and BaCaSi alloy, and its weight percentage is CaO: 30-60%, CaC2: 5-15%, SiC: 5-15%, Na2CO3: 5-15%, CaCO3: 5-15%, CaF2: 5-15%, BaCaSi: 2-10%, C: 2-10%, melting point ≤1400℃. The refining agent has the function of removing inclusions in steel, and also has the functions of foaming submerged arc and desulfurization. After the compound refining agent is used together, the T[O] in the finished steel can be reduced to the range of 5×10-6~15×10-6, and the grades of B, C and D inclusions are not greater than 1.0. Good de-S effect.

Description

technical field [0001] The invention relates to a refining agent for steelmaking, which belongs to the field of refining molten steel outside a furnace, in particular to refining molten steel when high-quality molten steel is smelted by a converter process. Background technique [0002] Because the oxygen blowing operation in the furnace during converter steelmaking will cause a large amount of Fe in molten steel to be oxidized into FeO, which will lead to a substantial increase in FeO in converter slag, and a large amount of converter slag will inevitably be brought into the ladle during converter steelmaking , and finally make the FeO of ladle slag in a higher range. Ladle slag with high FeO content has the ability to transfer oxygen to molten steel again, increasing the total oxygen content of molten steel and deteriorating the quality of molten steel. At the same time, in the deoxidation alloying of medium and high carbon steel, a large amount of Si-containing alloys su...

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
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C21C7/04C21C7/06C21C7/064
Inventor 曾建华李桂军陈永杨素波黎光正
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP