CN115287403A - Low-carbon low-silicon cold heading steel deoxidation method - Google Patents
Low-carbon low-silicon cold heading steel deoxidation method Download PDFInfo
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- CN115287403A CN115287403A CN202210977563.0A CN202210977563A CN115287403A CN 115287403 A CN115287403 A CN 115287403A CN 202210977563 A CN202210977563 A CN 202210977563A CN 115287403 A CN115287403 A CN 115287403A
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/06—Deoxidising, e.g. killing
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/0006—Adding metallic additives
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/0025—Adding carbon material
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Abstract
The invention relates to the technical field of smelting and manufacturing, in particular to a low-carbon low-silicon cold forging steel deoxidizing method, which comprises the following steps: adding carbon powder for deoxidation when tapping is started and the oxygen content is more than 350 ppm; adding aluminum iron for deoxidation when the free oxygen in the steel is 300-400 ppm. The method for deoxidizing the carbon low-silicon cold forging steel can reduce Al on the basis of ensuring the ALs content of molten steel during deoxidation 2 O 3 And impurities are generated, so that the purity of the molten steel is improved.
Description
Technical Field
The invention relates to the technical field of smelting and manufacturing, in particular to a low-carbon low-silicon cold forging steel deoxidizing method.
Background
In the related technology, converter top lance oxygen blowing smelting is usually adopted, and a large amount of free oxygen is reserved in molten steel through converter top oxygen blowing smelting, so that oxide inclusions and bubbles are easily formed, and the quality of casting blanks and steel products can be directly influenced; therefore, in the related art, a proper deoxidizer is added into the molten steel after smelting in the converter for deoxidation.
When the low-carbon low-silicon high-aluminum steel is deoxidized by using carbon powder, the molten steel is turned over greatly by using a large amount of carbon powder for deoxidation, so that accidents are easily caused, and the problem of recarburization is caused; if ferrosilicon is used for deoxidation, although recarburization of molten steel can be avoided, during the smelting process of the LF furnace, the deoxidation product SiO 2 The silicon content of the molten steel is easy to reduce, so that the silicon content of the molten steel is increased; if the aluminum deoxidation method is adopted, metal aluminum or aluminum-iron alloy is added during tapping, although the method is simple and the deoxidation speed is high, a large amount of Al is generated 2 O 3 The impurities are not easy to float upwards to form slag, so that the increase of non-metal impurities in the steel is caused, and the removal is difficult.
Disclosure of Invention
The invention aims to provide a low-carbon low-silicon cold forging steel deoxidizing method which can reduce Al on the basis of ensuring the ALs content of molten steel during deoxidizing 2 O 3 And impurities are generated, so that the purity of the molten steel is improved.
The invention is realized by the following steps:
the invention provides a low-carbon low-silicon cold forging steel deoxidizing method, which comprises the following steps:
adding carbon powder for deoxidation when tapping is started and the oxygen content is more than 350 ppm;
adding aluminum iron for deoxidation when the deoxidation is carried out until the free oxygen in the steel is 300-400 ppm.
In an alternative embodiment, the amount of carbon powder added is 0.35-0.6kg/t.
In an alternative embodiment, the carbon powder has a C content greater than or equal to 92%.
In an alternative embodiment, the amount of aluminum iron added is 3-4kg/t.
In an alternative embodiment, the aluminum content of the aluminum iron is 38-42%.
In an alternative embodiment, 300-400ppm of free oxygen in the steel remains after 25-35s of deoxidation by adding carbon powder, and ferroaluminum is added for deoxidation.
In an alternative embodiment, the method further comprises: before tapping, converter top oxygen blowing decarburization is carried out until the carbon content at the end point is less than 0.03%.
In an alternative embodiment, the endpoint temperature is 1620-1640 ℃.
In an alternative embodiment, the method further comprises: during tapping, the ladle is opened and the gas is blown to stir, and the gas flow for stirring is 50-80Nm 3 /h。
In an alternative embodiment, the low-carbon low-silicon high-aluminum steel grade comprises the following components in percentage by mass: c:0.04 to 0.07%, si: < 0.10%, als:0.025 to 0.045%, mn:0.2 to 0.35 percent.
The invention has the following beneficial effects:
the low-carbon low-silicon cold forging steel deoxidation method provided by the embodiment of the invention comprises the following steps: adding carbon powder for deoxidation when tapping is started and the oxygen content is more than 350 ppm; adding aluminum iron for deoxidation when the free oxygen in the steel is 300-400 ppm. By optimizing the adding time of carbon powder and aluminum iron and advancing the adding time of carbon, the reaction time of the carbon powder and oxygen in steel is relatively longer, the carbon powder and the oxygen in the steel are fully reacted as far as possible, the oxygen quantity participating in the aluminum oxygen reaction is reduced, even though the deoxidation is performed by adding the carbon powder as far as possible, the phenomenon that the molten steel is turned over greatly due to the addition of a large amount of carbon powder can be avoided, the aluminum iron is added for deoxidation when the oxygen content is 300-400ppm, part of the aluminum iron is ensured to participate in the aluminum deoxidation reaction, and the rest is dissolved in the molten steel and converted into Als; thus, not only the oxygen content in the steel is effectively reduced, but also the deoxidation product Al in the steel is reduced 2 O 3 And to ensure a sufficient content of Als in the steel.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially.
The invention provides a low-carbon low-silicon cold forging steel deoxidizing method, which is used for low-carbon low-silicon high-aluminum steel grades, and the low-carbon low-silicon high-aluminum steel grades comprise the following components in percentage by mass: c:0.04 to 0.07%, si: < 0.10%, als:0.025 to 0.045%, mn:0.2 to 0.35 percent.
It is noted that the low-carbon, low-silicon, high-aluminum steel grade includes, but is not limited to, the SWRCH6A steel grade.
The smelting process route of the low-carbon low-silicon high-aluminum steel grade comprises the following steps: converter → LF ladle furnace → conticaster or converter → LF ladle furnace → RH vacuum furnace → conticaster.
The low-carbon low-silicon high-aluminum steel has low content of C and Si elements which are easy to combine with oxygen in the steel, so that the solubility of [ O ] is increased, and oxygen in the air can contact steel slag and molten steel and enter the steel under the conditions of bottom blowing stirring and the like during smelting, so that the low-carbon low-silicon high-aluminum steel is easy to absorb oxygen.
The low-carbon low-silicon high-aluminum steel can also cause the carbon content of the molten steel to be increased by 0.01-0.02 percent due to the fact that the molten steel needs to be heated by electrifying the graphite electrode in the LF ladle furnace smelting process, the graphite electrode can be burnt or peeled off and the like to enter the steel, and the low-carbon low-silicon high-aluminum steel is easy to be increased in carbon.
Therefore, in order to ensure the quality of steel, the smelting end point of the converter is ensured as follows: 1. the end point carbon content is less than 0.03%. 2. Silicon-containing alloy can not be added in the tapping process, so that silicon deoxidation products are prevented from being reduced into steel again in the aluminum deoxidation process to cause silicon increase. 3. Aluminum is adopted for deoxidation, and enough Als in the steel can be ensured to continuously react with oxygen entering the steel, and the oxygen content in the steel is reduced.
At the same time, a large amount of Al is generated by the reaction of aluminum with oxygen 2 O 3 And products, which can seriously degrade the properties and quality of the steel. For reducing deoxidation products Al in steel 2 O 3 The low-carbon low-silicon cold forging steel deoxidizing method provided by the invention has the advantages that the method combining carbon deoxidation and aluminum deoxidation is adopted in the tapping process after converter blowing is finished, the deoxidizing cost is reduced, and the deoxidizing product Al in steel is reduced 2 O 3 While ensuring the steel to be fully removedOxygen and quick deoxidation, and avoids silicon increase of molten steel due to deoxidation.
The low-carbon low-silicon cold forging steel deoxidation method comprises the following steps:
blowing and decarbonizing the converter top oxygen until the end point carbon content is less than 0.03 percent, and the end point temperature is 1620-1640 ℃.
Adding carbon powder to deoxidize when tapping is started and the oxygen content is more than 350ppm (for example: the free oxygen of molten steel is about 800-1000 ppm);
adding aluminum iron for deoxidation when the deoxidation is carried out until the free oxygen in the steel is 300-400 ppm.
In the related technology, the reaction of aluminum and oxygen is prior to carbon under normal pressure, and the method can effectively reduce the aluminum consumption by optimizing the adding time of carbon powder and aluminum iron to perform carbon deoxidation in advance and then perform aluminum deoxidation; the method specifically comprises the following steps: the carbon adding time is advanced, carbon powder is added at the beginning of tapping and when the oxygen content is more than 350ppm, so that the reaction time of the carbon powder and the oxygen in steel is relatively long, the carbon powder and the oxygen in the steel are reacted fully as far as possible, the oxygen amount participating in the aluminum oxygen reaction is reduced, the carbon powder can be conveniently added for deoxidation as far as possible, the molten steel can be prevented from turning over greatly due to the addition of a large amount of carbon powder, the aluminum iron is added for deoxidation when the oxygen content is 300-400ppm, part of the aluminum iron is ensured to participate in the aluminum deoxidation reaction, and the rest is dissolved in the molten steel and converted into Als; thus, not only the oxygen content in the steel is effectively reduced, but also the Al content is reduced by reducing the using amount of the Al 2 O 3 I.e. reduction of deoxidation products Al in the steel 2 O 3 And ensuring that the steel has sufficient Als content; moreover, the method combines the carbon deoxidation and the aluminum deoxidation, can also reduce the deoxidation cost, ensure the characteristics of full deoxidation and quick deoxidation of the steel tapping, and avoid the silicon increase caused by the deoxidation of the molten steel.
It should be noted that when the free oxygen in the steel is higher than 350ppm, carbon powder is added to deoxidize, CO is generated and discharged from the surface of the molten steel.
It is also noted that the free oxygen content in the steel can be measured by means of a belly gun TSO or a manual oxygen lance setting; the free oxygen content is required to be favorable for avoiding the subsequent recarburizing component exceeding the range.
In some embodiments of the present invention, the substrate is,when the carbon powder is deoxidized, the adding amount of the carbon powder is 0.35-0.6kg/t, for example: 0.35kg/t, 0.4kg/t, 0.5kg/t, 0.6kg/t, etc. Thus, the oxygen in the steel can fully react with the carbon powder, the oxygen quantity subsequently participating in the aluminum oxidation reaction is reduced, and further Al is ensured 2 O 3 The amount of (a) is effectively controlled.
In some embodiments, the carbon powder has a C content greater than or equal to 92%, for example: 92%, 93%, 94%, etc. Thus, the carbon deoxidation can be fully utilized, the oxygen quantity subsequently participating in the aluminum oxygen reaction is reduced, and the Al is ensured 2 O 3 The amount of (a) is effectively controlled.
In some embodiments, the steel ladle is blown at the bottom opening during tapping, and the flow rate is 50-80Nm 3 And h, enabling the carbon powder to rapidly react with free oxygen in the steel to generate CO gas to be discharged out of the surface of the molten steel, and further ensuring full deoxidation and rapid deoxidation.
In some embodiments, 300-400ppm of free oxygen in the steel is remained after adding carbon powder for deoxidizing for 25-35s, and ferroaluminum is added for deoxidizing; specifically, after 25-35s of carbon powder is added, when about 2/3 of tapping is finished, namely carbon-oxygen reaction is slowed, free oxygen in steel is remained for 300-400ppm, aluminum and iron are added, so that part of aluminum and iron are ensured to participate in aluminum deoxidation reaction, the rest is dissolved in molten steel and converted into Als, so that effective deoxidation is ensured, and Al is reduced 2 O 3 While ensuring the amount of Als.
Further, the addition amount of the aluminum iron is 3-4kg/t, for example: 3kg/t, 3.5kg/t, 4kg/t, etc. Thus, effective deoxidation can be ensured, the Als content can be ensured, and the generation of a large amount of Al can be avoided 2 O 3 And (4) inclusion.
Still further, the aluminum content in the ferro-aluminum is 38-42%, for example: 38%, 40%, 42%, etc. Thus, effective deoxidation can be ensured, the Als content can be ensured, and the generation of a large amount of Al can be avoided 2 O 3 And (4) inclusion.
It should be noted that, when the free oxygen is more than 350ppm, the added carbon powder can be fully oxidized without generating the bad result of carbon increasing; taking SWRCH6A as an example, it belongs to low carbon steel, and has the characteristic of easy recarburization, so when using carbon powder to deoxidizeIt is also desirable to avoid the adverse effects of recarburization. Meanwhile, the purpose of deoxidizing by using carbon powder before aluminum deoxidation is to reduce the aluminum deoxidation, namely to reduce the Al product of the aluminum deoxidation 2 O 3 Impurities and improve the purity of the molten steel.
In some embodiments, after the aluminum iron is added for deoxidation, the low-carbon manganese alloy can be sequentially added, then the lime and the synthetic slag are sequentially added, the alloy and slag materials can be rapidly melted by molten steel impact stirring and bottom blowing stirring, and Al generated by aluminum deoxidation can be adsorbed after the added slag materials are dissolved 2 O 3 The inclusion plays a role in purifying molten steel in advance, namely the purpose of slagging and removing the inclusion in advance is realized.
Further, the amount of lime added may be about 5kg/t, for example: 4.5kg/t, 5kg/t, 5.5kg/t, etc.
Still further, the addition amount of the synthetic slag may be about 3kg/t, for example: 2.8kg/t, 3kg/t, 3.5kg/t, etc.
The present invention will be described in further detail with reference to examples.
Example 1
And (3) blowing and decarbonizing the top oxygen of the converter to the end point carbon content of 0.029%, wherein the end point temperature is 1620 ℃, and the free oxygen of the molten steel is 800ppm.
After tapping of the converter is started, 0.35kg/t of simple substance carbon powder is added, and the C content of the carbon powder is 92%; blowing and stirring the ladle at the bottom opening in the tapping process, wherein the flow rate is 50Nm 3 /h。
After 30 seconds of adding the carbon powder, when about 2/3 of the steel is tapped, 300ppm of free oxygen in the steel is remained, and 3kg/t of aluminum iron is added, wherein the aluminum content in the aluminum iron is 40 percent.
Then adding low-carbon manganese alloy in sequence, and adding 5kg/t lime and 3kg/t synthetic slag in sequence.
Example 2
The converter top oxygen is blown and decarburized until the end point carbon content is 0.02 percent, the end point temperature is 1640 ℃, and the free oxygen of the molten steel is 1000ppm.
Adding 0.6kg/t of simple substance carbon powder after tapping of the converter, wherein the C content of the carbon powder is 94%; blowing and stirring the ladle at the bottom opening in the tapping process, wherein the flow rate is 80Nm 3 /h。
After 35 seconds of adding the carbon powder, when about 2/3 of the steel is tapped, 400ppm of free oxygen in the steel is remained, and 4kg/t of aluminum iron is added, wherein the aluminum content in the aluminum iron is 42 percent.
Then adding low-carbon manganese alloy in sequence, and adding 5.1kg/t lime and 3.2kg/t synthetic slag in sequence.
Example 3
The converter top oxygen blowing decarburization is carried out until the end point carbon content is 0.025 percent, the end point temperature is 1630 ℃, and the free oxygen of the molten steel is 900ppm.
After tapping of the converter is started, 0.4kg/t of simple substance carbon powder is added, and the C content of the carbon powder is 93 percent; blowing and stirring the ladle at the bottom opening in the tapping process, wherein the flow rate is 60Nm 3 /h。
After 25s of carbon powder is added, when about 2/3 of the steel is tapped, 350ppm of free oxygen in the steel is left, and 3.5kg/t of aluminum-iron is added, wherein the aluminum content in the aluminum-iron is 38 percent.
Then adding low-carbon manganese alloy in sequence, and adding 4.9kg/t lime and 2.9kg/t synthetic slag in sequence.
Example 4
The converter top oxygen is blown and decarburized until the end point carbon content is 0.028%, the end point temperature is 1625 ℃, and the free oxygen of the molten steel is 850ppm.
After tapping of the converter is started, 0.5kg/t of simple substance carbon powder is added, and the C content of the carbon powder is 92%; the steel ladle is blown and stirred at the bottom opening in the tapping process, and the flow is 70Nm 3 /h。
After 30s of carbon powder is added, when about 2/3 of steel tapping is finished, 400ppm of free oxygen in steel is remained, and 3.8kg/t of aluminum-iron is added, wherein the aluminum content in the aluminum-iron is 41 percent.
Then adding low-carbon manganese alloy in sequence, and adding 5kg/t lime and 3.1kg/t synthetic slag in sequence.
Comparative example 1
The process of comparative example 1 refers to example 1, differing from example 1 in that: 0.2kg/t of simple substance carbon powder is added after tapping of the converter is started, namely, the adding amount of the carbon powder in the comparative example 1 is less than that in the example 1.
Comparative example 2
Comparative example 2 the process of comparative example 1 differs from example 1 in that: 0.7kg/t of simple substance carbon powder is added after tapping of the converter is started, namely, the adding amount of the carbon powder in the comparative example 2 is more than that in the example 1.
Comparative example 3
Comparative example 3 the process of comparative example 1 differs from example 1 in that: 0.2kg/t of simple substance carbon powder is added after tapping of the converter is started, and 5kg/t of aluminum and iron are added after the carbon powder is added for 30s, namely, the adding amount of the carbon powder in comparative example 3 is less than that in example 1, and the adding amount of the aluminum and iron is more than that in example 1.
Comparative example 4
Comparative example 4 the process of comparative example 1 differs from example 1 in that: 0.7kg/t of simple substance carbon powder is added after tapping of the converter begins, and 5kg/t of aluminum iron is added after the carbon powder is added for 30s, namely, the adding amount of the carbon powder in comparative example 4 is more than that in example 1, and the adding amount of the aluminum iron is more than that in example 1.
Comparative example 5
The process of comparative example 5 refers to example 1, differing from example 1 in that: after tapping of the converter is started, 0.35kg/t of carbon powder and 3kg/t of aluminum iron are simultaneously added for deoxidation, namely, the adding time of the carbon powder and the aluminum iron in the comparative example 5 is different from that in the example 1, and the adding time of the aluminum iron in the comparative example 5 is the adding time of the aluminum iron at the beginning of the converter, namely, the adding time of the aluminum iron is earlier than that in the example 1.
Comparative example 6
Comparative example 6 the process of comparative example 1 differs from example 1 in that: after tapping of the converter is started, 0.2kg/t of carbon powder and 5kg/t of aluminum iron are simultaneously added for deoxidation, namely the adding time of the carbon powder and the aluminum iron in the comparative example 6 is different from that in the example 1, the adding time of the aluminum iron in the comparative example 6 is earlier than that in the example 1 when the converter is started, and the adding amount of the carbon powder in the comparative example 6 is less than that in the example 1, and the adding amount of the aluminum iron is more than that in the example 1.
Comparative example 7
Comparative example 7 process reference example 1 differs from example 1 in that: after the carbon powder is added for 20s, 500ppm of free oxygen in the steel is left, and 5kg/t of aluminum iron is added for deoxidation, namely the aluminum iron in the comparative example 7 is added at a different time from that in the example 1, namely the aluminum iron in the comparative example 7 is added at a time earlier than that in the example 1, and the adding amount of the aluminum iron is more than that in the example 1.
Comparative example 8
Comparative example 8 the process of comparative example 1 differs from example 1 in that: 3kg/t of aluminum iron is added after tapping of the converter begins, 0.35kg/t of simple substance carbon powder is added after 30S of the aluminum iron is added, namely the adding time of the aluminum iron and the carbon powder in the comparative example 8 is opposite to that in the example 1.
The deoxidation results of examples 1 to 4 and comparative examples 1 to 8 were compared, and the results are shown in Table 1.
TABLE 1
From the results in Table 1, it can be seen that:
comparative example 1 added less carbon powder and the deoxidation effect was reduced.
Comparative example 2 added more carbon powder resulting in significant recarburization.
Comparative example 3 added less carbon powder and more aluminum iron, resulting in ALs and Al 2 O 3 High content of (D).
Comparative example 4 added more carbon powder and more aluminum iron, resulting in ALs and Al 2 O 3 High content of (b), and results in significant recarburisation.
Comparative example 5 after tapping start in a converter, simultaneous addition of carbon powder and ferroaluminum was deoxidized to result in Al 2 O 3 High content of (2) and obvious carbon increasing.
Comparative example 6 after tapping of the converter started, simultaneous addition of carbon powder and ferro-aluminum was deoxidized with less carbon powder and more ferro-aluminum, resulting in Al 2 O 3 The content of (a) is higher.
Comparative example 7 aluminum iron was added in greater amounts and at an earlier time, al 2 O 3 High content of (D).
Comparative example 8 adding Al-Fe and then carbon powder, the deoxidation effect is poor, and Al is 2 O 3 The content of (a) is significantly increased.
In conclusion, carbon powder is added to deoxidize the low-carbon low-silicon cold forging steel in the early stage of converter tapping to generate CO gas and discharge molten steel, so that the generation of Al2O3 inclusions serving as aluminum deoxidation products is reduced, and the content of initial inclusions in the molten steel is reduced; can also be usedThe content of Als in the deoxidized steel is stably controlled, so that the refining process is prevented from supplementing aluminum, and the Al generated again by the molten steel is reduced 2 O 3 And (4) inclusion.
The present invention has been described in terms of the preferred embodiment, and it is not intended to be limited to the embodiment. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A low-carbon low-silicon cold forging steel deoxidation method is characterized by comprising the following steps:
adding carbon powder for deoxidation when tapping is started and the oxygen content is more than 350 ppm;
adding aluminum iron for deoxidation when the deoxidation is carried out until the free oxygen in the steel is 300-400 ppm.
2. The method for deoxidizing low carbon and low silicon cold heading steel as claimed in claim 1, wherein the amount of carbon powder added is 0.35 to 0.6kg/t.
3. The method for deoxidizing low carbon and low silicon cold heading steel as claimed in claim 2, wherein the carbon powder has a C content of 92% or more.
4. The method for deoxidizing low carbon and low silicon cold heading steel as claimed in claim 1, wherein the amount of aluminum and iron added is 3 to 4kg/t.
5. The method for deoxidizing low carbon low silicon cold heading steel as claimed in claim 4, wherein the aluminum content in said aluminum iron is 38 to 42%.
6. The method for deoxidizing the low carbon and low silicon cold heading steel as claimed in claim 1, wherein 300 to 400ppm of free oxygen in the steel remains after adding the carbon powder for deoxidizing for 25 to 35 seconds, and the aluminum iron is added for deoxidizing.
7. The method for deoxidizing of a low carbon low silicon cold heading steel as set forth in claim 1, further comprising: before tapping, the top oxygen of the converter is blown and decarburized until the carbon content at the end point is less than 0.03 percent.
8. The method for deoxidizing of low carbon low silicon cold heading steel of claim 7, wherein said end point temperature is 1620-1640 ℃.
9. The method for deoxidizing a low carbon low silicon cold heading steel as claimed in claim 1, further comprising: in the tapping process, the ladle is blown and stirred by blowing at the bottom, and the stirring air flow is 50-80Nm 3 /h。
10. The method for deoxidizing of low carbon low silicon cold heading steel as claimed in claim 1, wherein the method is applied to a low carbon low silicon high aluminum steel grade, and the composition of the low carbon low silicon high aluminum steel grade comprises, by mass: c:0.04 to 0.07%, si: < 0.10%, als:0.025 to 0.045%, mn:0.2 to 0.35 percent.
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| CN105695664A (en) * | 2016-04-21 | 2016-06-22 | 日照宝华新材料有限公司 | Low-cost converter steelmaking deoxidization process |
| CN108588333A (en) * | 2016-04-21 | 2018-09-28 | 日照宝华新材料有限公司 | A kind of inexpensive deoxidization technique of pneumatic steelmaking |
| CN107012285A (en) * | 2017-05-03 | 2017-08-04 | 唐山国丰钢铁有限公司 | A kind of inexpensive deoxidization technique of converter mild steel tapping process |
| CN111705178A (en) * | 2020-06-02 | 2020-09-25 | 马鞍山钢铁股份有限公司 | Method for controlling oxygen content in molten steel RH vacuum refining furnace |
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