CN102732665A - Method for increasing nitrogen in molten steel in last stage of converter smelting - Google Patents
Method for increasing nitrogen in molten steel in last stage of converter smelting Download PDFInfo
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- CN102732665A CN102732665A CN2012100874355A CN201210087435A CN102732665A CN 102732665 A CN102732665 A CN 102732665A CN 2012100874355 A CN2012100874355 A CN 2012100874355A CN 201210087435 A CN201210087435 A CN 201210087435A CN 102732665 A CN102732665 A CN 102732665A
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- Prior art keywords
- nitrogen
- molten steel
- converter
- steel
- reductor
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title claims abstract description 130
- 229910052757 nitrogen Inorganic materials 0.000 title claims abstract description 65
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 57
- 239000010959 steel Substances 0.000 title claims abstract description 57
- 238000003723 Smelting Methods 0.000 title claims abstract description 20
- 238000000034 method Methods 0.000 title claims abstract description 10
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 20
- 239000001301 oxygen Substances 0.000 claims abstract description 20
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 20
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 5
- 239000000956 alloy Substances 0.000 claims abstract description 5
- 229910000838 Al alloy Inorganic materials 0.000 claims abstract description 4
- 229910004072 SiFe Inorganic materials 0.000 claims abstract description 4
- 238000011010 flushing procedure Methods 0.000 claims description 6
- 238000007664 blowing Methods 0.000 abstract description 7
- 238000010079 rubber tapping Methods 0.000 abstract description 4
- 238000001514 detection method Methods 0.000 abstract 1
- 239000002436 steel type Substances 0.000 abstract 1
- 238000005516 engineering process Methods 0.000 description 3
- 238000005275 alloying Methods 0.000 description 2
- 150000004767 nitrides Chemical class 0.000 description 2
- 241001062472 Stokellia anisodon Species 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910052758 niobium Inorganic materials 0.000 description 1
- 239000010955 niobium Substances 0.000 description 1
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 description 1
- 230000008520 organization Effects 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Treatment Of Steel In Its Molten State (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
Abstract
The invention discloses a method for increasing nitrogen in molten steel in the last stage of converter smelting, wherein in the last stage of converter smelting, Al alloy or SiFe, MnFe and SiMnFe alloy is added into a converter as a deoxidizer, and the oxygen content in the molten steel is controlled to be not more than 0.050 wt%; and blowing nitrogen with sufficient pressure and flow into the converter molten bath by using a bottom lance and a top blowing lance, wherein the nitrogen blowing time is set according to the requirements of the steel grade to be smelted. The method can obviously improve the nitrogen content in the molten steel, and the actual detection shows that the nitrogen content in the molten steel after tapping can reach 50-300ppm, and is increased by 35-208ppm compared with the nitrogen content of a heat without the method, so that the nitrogen content requirements of different steel types can be met.
Description
Technical field
The invention belongs to the smelting technology technical field, particularly a kind ofly in converter steelmaking process, especially smelt the method that the later stage carries out molten steel nitrogen pick-up.
Background technology
As everyone knows, nitrogen is the harmful element in the steel.When steel were faster cooled off by high temperature, the nitrogen in the steel will form nitride and separate out, thereby the intensity of steel and hardness are improved, and the phenomenon that plasticity reduces greatly in association simultaneously, so-called blue shortness promptly occurs.For the higher steel grade of nitrogen content; Can take place after long-time the placement to wear out and the timeliness problem; But in the other steel grade; Nitrogen also can combine to generate nitride with alloying element in the steel such as titanium, niobium, vanadium, aluminium etc., and in steel, play adjustment crystal grain, improve steel and improve rigidity can effect.For example stainless steel, petroleum pipeline steel etc. all need add certain nitrogen element, to improve steel and use properties.
The original nitrogen pick-up technology of converter is to adopt bottom blowing nitrogen to carry out nitrogen pick-up.But because the oxygen supply of converter top-blow oxygen rifle is constantly being carried out, molten steel has higher oxygen level simultaneously, and bottom blowing nitrogen air supply intensity is lower; Therefore nitrogen pick-up efficient is low, and nitrogen content is no more than 0.006% before the general tapping, can't meet the demands when therefore producing high nitrogen steel; Must after tapping, carry out the alloying of nitrogen, generally adopt nitroalloy to carry out or bottom blowing nitrogen carries out nitrogen pick-up, when adopting nitroalloy nitrogen pick-up in the ladle; The top slag foams easily, has potential safety hazard, and that ladle bottom blowing nitrogen or RH lift gas switch to nitrogen nitrogen pick-up efficient is low; The nitrogen flushing time is long, does not utilize the control of organization of production and temperature.
Summary of the invention
The object of the present invention is to provide and a kind ofly carry out the method for molten steel nitrogen pick-up latter stage, thereby significantly improve the nitrogen content in the molten steel, to satisfy the requirement of steel grade nitrogen content at converter smelting.
For reaching this purpose, the technical solution that the present invention taked is:
A kind of converter smelting carries out the method for molten steel nitrogen pick-up latter stage, it is characterized in that, in converter, adds reductor latter stage at converter smelting, and in molten steel, is blown into the purpose that nitrogen reaches nitrogen pick-up through the oxygen rifle; Concrete grammar and step are:
1, when converter smelting to 4/5 constantly after; In converter, add Al alloy or SiFe, MnFe, SiMnFe alloy as reductor; Oxygen level in the control molten steel, the addition of reductor is adjusted according to the C content in the molten steel, and target is that the oxygen level in the control molten steel is not more than 0.050wt%;
2, behind the adding reductor, utilize the oxygen rifle in converter molten pool, to be blown into the nitrogen of pressure 0.8-1.0MPa, flow 29000-33000Nm3/h, make nitrogen fully incorporate in the molten steel; The nitrogen flushing time requires to set according to the steel grade of smelting, and be as the criterion with the nitrogen content that reaches the steel grade requirement, and being blown into of nitrogen adopts end rifle and top blow oxygen lance to carry out simultaneously.
The present invention is preferential to be recommended reductor adding opportunity is a smelting endpoint.
Beneficial effect of the present invention is:
Embodiment of the present invention can significantly improve the nitrogen content in the molten steel; Through actual detected, after tapping finished, the nitrogen content in the molten steel can reach 0.0050-0.030wt%; The ratio not nitrogen content of embodiment of the present invention heat increases 0.0035-0.025 wt%, thereby can satisfy the nitrogen content requirement of different steel grades.
Embodiment
With 100 tons of converters N80 steel that is limited to 0.01 wt% on the nitrogen that manufactures a finished product is example, and the present invention is described further.
Embodiment 1:
1, when converter smelting to 4/5 constantly after, according to the C content in the molten steel, the Al alloy that in converter, adds 300kg is as reductor, the oxygen level in the control molten steel is 0.035wt%.
2, add reductor after, utilize end rifle and top blow oxygen lance in the molten bath, to be blown into pressure simultaneously for 0.9MPa, flow nitrogen for 30000Nm3/h, make nitrogen fully incorporate in the molten steel; The nitrogen flushing time is 60s, thereby makes the nitrogen content in the steel increase by 0.0058 wt%.
Embodiment 2:
1, when converter smelting to 5/6 constantly after, according to the C content in the molten steel, the SiFe alloy that in converter, adds 500kg is as reductor, the oxygen level in the control molten steel is 0.048wt%.
2, add reductor after, utilize end rifle and top blow oxygen lance in the molten bath, to be blown into pressure simultaneously for 0.95MPa, flow nitrogen for 32000Nm3/h, make nitrogen fully incorporate in the molten steel; The nitrogen flushing time is 120s, makes the nitrogen content in the steel increase by 0.0110 wt%.
Embodiment 3:
1, when converter reaches smelting endpoint, according to the C content in the molten steel, the SiMnFe alloy that in converter, adds 700kg is as reductor, and the oxygen level in the control molten steel is 0.040wt%.
2, add reductor after, utilize end rifle and top blow oxygen lance in the molten bath, to be blown into pressure simultaneously for 0.90MPa, flow nitrogen for 30000Nm3/h, make nitrogen fully incorporate in the molten steel; The nitrogen flushing time is 240s, makes the nitrogen content in the steel increase by 0.0208 wt%.
Claims (2)
1. the method that converter smelting carries out molten steel nitrogen pick-up latter stage is characterized in that, in converter, adds reductor latter stage at converter smelting, and in molten steel, is blown into the purpose that nitrogen reaches nitrogen pick-up through the oxygen rifle; Concrete grammar and step are:
(1), when converter smelting to 4/5 constantly after; In converter, add Al alloy or SiFe, MnFe, SiMnFe alloy as reductor; Oxygen level in the control molten steel; The addition of reductor is adjusted according to the C content in the molten steel, and target is that the oxygen level in the control molten steel is not more than 0.050wt%;
(2), add reductor after, utilize the oxygen rifle in converter molten pool, to be blown into the nitrogen of pressure 0.8-1.0MPa, flow 29000-33000Nm3/h, make nitrogen fully incorporate in the molten steel; The nitrogen flushing time requires to set according to the steel grade of smelting, and be as the criterion with the nitrogen content that reaches the steel grade requirement, and being blown into of nitrogen adopts end rifle and top blow oxygen lance to carry out simultaneously.
2. converter smelting according to claim 1 carries out the method for molten steel nitrogen pick-up latter stage, it is characterized in that, said reductor adding opportunity is a smelting endpoint.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012100874355A CN102732665A (en) | 2012-03-29 | 2012-03-29 | Method for increasing nitrogen in molten steel in last stage of converter smelting |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012100874355A CN102732665A (en) | 2012-03-29 | 2012-03-29 | Method for increasing nitrogen in molten steel in last stage of converter smelting |
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| Publication Number | Publication Date |
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| CN102732665A true CN102732665A (en) | 2012-10-17 |
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| CN2012100874355A Pending CN102732665A (en) | 2012-03-29 | 2012-03-29 | Method for increasing nitrogen in molten steel in last stage of converter smelting |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102925618A (en) * | 2012-10-23 | 2013-02-13 | 鞍钢股份有限公司 | Nitrogen increasing method for vanadium and nitrogen-containing microalloyed steel |
| CN103468857A (en) * | 2013-08-29 | 2013-12-25 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for controlling content of nitrogen in molten steel in smelting process of converter |
| CN103526007A (en) * | 2013-10-16 | 2014-01-22 | 南京钢铁股份有限公司 | Heat treatment process of medium-thickness non-quenched tempered plastic mold steel plate |
| CN105506214A (en) * | 2016-02-25 | 2016-04-20 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for increasing nitrogen content of converter tapping |
| CN108690898A (en) * | 2018-06-14 | 2018-10-23 | 鞍钢股份有限公司 | Accurate control method for nitrogen increase of combined blown converter |
| CN113337679A (en) * | 2021-06-21 | 2021-09-03 | 重庆钢铁股份有限公司 | Method for increasing nitrogen content in steel |
| CN115838891A (en) * | 2022-11-24 | 2023-03-24 | 中国铁建重工集团股份有限公司 | Smelting method for producing high manganese steel by using foundry returns |
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| GB2057509A (en) * | 1979-08-30 | 1981-04-01 | Boc Ltd | Steel making in top-blown converter |
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| JP4839658B2 (en) * | 2005-03-31 | 2011-12-21 | Ｊｆｅスチール株式会社 | Refining method of bearing steel |
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2012
- 2012-03-29 CN CN2012100874355A patent/CN102732665A/en active Pending
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102925618A (en) * | 2012-10-23 | 2013-02-13 | 鞍钢股份有限公司 | Nitrogen increasing method for vanadium and nitrogen-containing microalloyed steel |
| CN103468857A (en) * | 2013-08-29 | 2013-12-25 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for controlling content of nitrogen in molten steel in smelting process of converter |
| CN103468857B (en) * | 2013-08-29 | 2016-03-02 | 攀钢集团攀枝花钢铁研究院有限公司 | A kind of converter smelting controls the method for nitrogen content in molten steel |
| CN103526007A (en) * | 2013-10-16 | 2014-01-22 | 南京钢铁股份有限公司 | Heat treatment process of medium-thickness non-quenched tempered plastic mold steel plate |
| CN103526007B (en) * | 2013-10-16 | 2015-05-27 | 南京钢铁股份有限公司 | Heat treatment process of medium-thickness non-quenched tempered plastic mold steel plate |
| CN105506214A (en) * | 2016-02-25 | 2016-04-20 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for increasing nitrogen content of converter tapping |
| CN108690898A (en) * | 2018-06-14 | 2018-10-23 | 鞍钢股份有限公司 | Accurate control method for nitrogen increase of combined blown converter |
| CN113337679A (en) * | 2021-06-21 | 2021-09-03 | 重庆钢铁股份有限公司 | Method for increasing nitrogen content in steel |
| CN115838891A (en) * | 2022-11-24 | 2023-03-24 | 中国铁建重工集团股份有限公司 | Smelting method for producing high manganese steel by using foundry returns |
| CN115838891B (en) * | 2022-11-24 | 2024-04-26 | 中国铁建重工集团股份有限公司 | Smelting method for producing high manganese steel by using returned furnace material |
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Application publication date: 20121017 |