CN103555891B - A kind of antivacuum process reduces hydrogen content method in steel - Google Patents
A kind of antivacuum process reduces hydrogen content method in steel Download PDFInfo
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- CN103555891B CN103555891B CN201310480320.7A CN201310480320A CN103555891B CN 103555891 B CN103555891 B CN 103555891B CN 201310480320 A CN201310480320 A CN 201310480320A CN 103555891 B CN103555891 B CN 103555891B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
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Abstract
The present invention relates to a kind of antivacuum process and reduce hydrogen content method in steel, comprise the following steps: 1) make steel tapping sulfur content less than finished product desired value；2) addition agent lid tank；3) previous tank is ploughed under this tank molten steel top with the casting residue of steel grade；If ploughing under without previous tank deck slag, the fritting synthetic slag adding 1.5～2.5kg/ ton steel carries out submerged arc desulfurization；4) alloy is through baking in more than 8 hours before steel-making adds, and steel-making adds alloy；5) when not entering vacuum treated steel grade, use and entirely repair more than 5 times and the ladle of light maintenance more than 2 times；6) slag steel and iron sheet are not used during converter smelting；7) baking of tundish 3～8 hours.Compared with prior art, the invention has the beneficial effects as follows: produce the steel grade of antivacuum process and can realize hydrogen content and reach more than 96% less than 3.0ppm, corresponding thickness >=40mm steel plate inspection qualification rate, improve about 20% than common process flaw detection qualification rate.
Description
Technical field
The present invention relates to metallurgical technology field, reduce hydrogen content method in steel particularly to antivacuum process of one.
Background technology
When hydrogen content is higher in steel, easily causes thick steel plates and form hydrogen cause internal fissure, cause flaw detection not conform to.Remove in steel
The main method of hydrogen is that molten steel is carried out evacuation process, to reduce hydrogen content in steel.When process conditions do not possess vacuum dehydrogenation
Time, be difficult to overcome hydrogen higher and thick steel plates flaw detection do not conform between contradiction.Need for this to design a set of new manipulation method to the greatest extent
The problem that the hydrogen content in steel does not conforms to may be reduced to solve thick steel plates to detect a flaw.
Summary of the invention
It is an object of the invention to provide a kind of think gauge steel grade to needs flaw detection, when process conditions do not possess molten steel vacuum dehydrogenation
Time can reduce the method for hydrogen content in steel.
For achieving the above object, the present invention realizes by the following technical solutions:
A kind of antivacuum process reduces hydrogen content method in steel, comprises the following steps:
1) steel-making tapping sulfur content is less than finished product desired value+0.03%, to alleviate the desulfurization task of refining procedure；
2) pre-melted slag or hollow magnesia lid tank agent lid tank are added after converter tapping；
3) after entering refining procedure, previous tank is ploughed under this tank molten steel top with the casting residue of steel grade, carry out essence as top slag
Refining, previous tank casting remaining top slag is the lowest through high temperature evaporation hydrogen content；If ploughing under without previous tank deck slag, add 1.5～2.5kg/
The fritting synthetic slag of ton steel carries out submerged arc desulfurization；
4) alloy to add the alloy of substantial amount through baking in more than 8 hours, steel-making before steel-making adds, and controls essence
Refining alloy addition is less than 1.50kg/ ton steel；
5) when producing think gauge and need to detect a flaw and not enter vacuum treated steel grade, use and entirely repair the ladle of more than 5 times and little
Repair the ladle of more than 2 times, with control ladle lining moisture spread in molten steel；
6) slag steel and iron sheet are not used during converter smelting；
7) baking of tundish 3～8 hours, gas flow is 80～200Nm3/h。
Compared with prior art, the invention has the beneficial effects as follows:
A kind of antivacuum process reduces hydrogen content method in steel, under meeting technological requirement, produces the steel grade of antivacuum process
Hydrogen content can be realized reach more than 96% less than 3.0ppm, corresponding thickness >=40mm steel plate inspection qualification rate, compare unskilled labor
Skill flaw detection qualification rate improves about 20%.
Detailed description of the invention
Below the detailed description of the invention of the present invention is further illustrated:
Embodiment one
Producing as a example by flaw detection structural slab Q345D by 100 tons of ladles, a kind of antivacuum process reduces hydrogen content method in steel,
Comprise the following steps:
1) steel-making tapping sulfur content is less than finished product desired value+0.03%, to alleviate the desulfurization task of refining procedure；
2) pre-melted slag lid tank is added after converter tapping；
3) after entering refining procedure, previous tank is ploughed under this tank molten steel top with the casting residue of steel grade, carry out essence as top slag
Refining；
4) alloy to add the alloy of substantial amount through baking in 10 hours, steel-making before steel-making adds, and controls refine and closes
Gold addition 1.03kg/ ton steel；
5) when producing this steel grade, use the ladle of the number of turnover 18 times, use and entirely repair the ladle of more than 5 times and little
Repair the ladle of more than 2 times, with control ladle lining moisture spread in molten steel；
6) do not use slag steel and iron sheet during converter smelting, use self-produced base head and base tail steel scrap；
7) tundish little fire baking 5 hours, gas flow is 80～200Nm3/h。
Achieve liquid steel refining terminal hydrogen content 2.1ppm.
Described above is only the ultimate principle of the present invention, not imposes any restrictions the present invention, every enters it according to the present invention
Row equivalent variations and modification, all within the category of the art of this patent protection scheme.
Claims (1)
1. antivacuum a process reduces hydrogen content method in steel, it is characterised in that comprise the following steps:
1) steel-making tapping sulfur content is less than finished product desired value+0.03%, to alleviate the desulfurization task of refining procedure；
2) pre-melted slag or hollow magnesia lid tank agent lid tank are added after converter tapping；
3) after entering refining procedure, with the casting residue of steel grade, previous tank being ploughed under this tank molten steel top, carry out refine as top slag, previous tank casting residue is the lowest through high temperature evaporation hydrogen content；If ploughing under without previous tank deck slag, the fritting synthetic slag adding 1.5～2.5kg/ ton steel carries out submerged arc desulfurization；
4) alloy to add the alloy of substantial amount through baking in more than 8 hours, steel-making before steel-making adds, and controls refined alloy addition less than 1.50kg/ ton steel；
5) when producing think gauge and need to detect a flaw and not enter vacuum treated steel grade, use the ladle entirely repairing the ladle of more than 5 times and light maintenance more than 2 times, serve as a contrast moisture and spread in molten steel controlling ladle；
6) slag steel and iron sheet are not used during converter smelting；
7) baking of tundish 3～8 hours, gas flow is 80～200Nm3/h。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310480320.7A CN103555891B (en) | 2013-10-14 | 2013-10-14 | A kind of antivacuum process reduces hydrogen content method in steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201310480320.7A CN103555891B (en) | 2013-10-14 | 2013-10-14 | A kind of antivacuum process reduces hydrogen content method in steel |
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| Publication Number | Publication Date |
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| CN103555891A CN103555891A (en) | 2014-02-05 |
| CN103555891B true CN103555891B (en) | 2016-11-02 |
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| CN112831625A (en) * | 2021-01-04 | 2021-05-25 | 南京钢铁股份有限公司 | Smelting process for controlling hydrogen content of molten steel of non-vacuum steel |
| CN114703418A (en) * | 2022-02-25 | 2022-07-05 | 鞍钢股份有限公司 | Method for improving internal quality of ship plate steel |
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