CN103160637A - Low-phosphorous steel smelting method of mixed blowing of oxygen and nitrogen of top blowing oxygen lance of converter - Google Patents
Low-phosphorous steel smelting method of mixed blowing of oxygen and nitrogen of top blowing oxygen lance of converter Download PDFInfo
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- CN103160637A CN103160637A CN2013100594823A CN201310059482A CN103160637A CN 103160637 A CN103160637 A CN 103160637A CN 2013100594823 A CN2013100594823 A CN 2013100594823A CN 201310059482 A CN201310059482 A CN 201310059482A CN 103160637 A CN103160637 A CN 103160637A
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Abstract
The invention relates to a low-phosphorous steel smelting method of mixed blowing of oxygen and nitrogen of a top blowing oxygen lance of a converter, and belongs to the technical field of converter steelmaking. The low-phosphorous steel smelting method of mixed blowing of the oxygen and the nitrogen of the top blowing oxygen lance of the converter includes the following steps that firstly, blowing of a dephosphorizing phase is conducted in the converter, blowing time is controlled in 6-9min, and normal blowing is conducted after deslagging; top-blowing air is mixed gas of the nitrogen and the oxygen in the dephosphorizing phase of the converter; and raw materials which are used by steelmaking are melted iron scrap steel, and scrap ratio is 5%-15%. The low-phosphorous steel smelting method of mixed blowing of the oxygen and the nitrogen of the top blowing oxygen lance of the converter has the advantages that a part of nitrogen is mixed into the top-blowing gas in the dephosphorizing phase, so that low oxygen supply is reached, and simultaneously top-blowing gas supply strength is not reduced (top-blowing mixing intensity is not reduced). Control of molten bath temperature1300DEG C-1380DEG C in the dephosphorizing phase is reduced, and dephosphorizing rate of the dephosphorizing phase is improved, low-phosphorou and extremely low-phosphorous steel with fished phosphorous content lower than 60ppm is achieved. High-phorphorous molten iron can be adopted to smelt, blowing is stable, and dephosphorizing efficiency is high.
Description
Technical field
The invention belongs to the converter steeling technology field, the Low-phosphorus Steel smelting process of the mixed oxygen blast gas of a kind of converter top-blow oxygen rifle and nitrogen particularly is provided; Can realize low-phosphorous, the even smelting of utmost point Low-phosphorus Steel; Be applicable to the two slag meltings of converter dephosphorization pre-treatment and converter.
Background technology
Phosphorus is a kind of easy segregation element in steel, and greater than 0.015% the time, the segregation of phosphorus sharply increases when phosphorus content in steel, and impels segregation line hardness to increase, and simultaneously, phosphorus also worsens welding property, significantly reduces the low-temperature impact toughness of steel, improves the brittle transition temperature of steel.The pipe line steel of present domestic Wide and Thick Slab production field production, offshore platform steel, oil well pipe steel, low-temperature (low temperature) vessel all need low phosphorus content with steel etc.
Present smelting molten steel is low-phosphorous, top-blown gas that utmost point Low-phosphorus Steel adopts is oxygen, and the technique of employing has converter duplex, extra furnace dephosphorization etc., has the part molten steel to adopt the converter Hot Metal Dephosphorization Pretreatment.Because domestic steel mill converter bottom blowing gas-feeding intensity is hanged down at 0.03M
3/ min/t left and right, the subject matter that runs into for the smelting technology that adopts dephosphorizing pretreatment has three aspects::
1, cause that easily stirring intensity of molten pool reduces after dephosphorizing pretreatment stage reduction oxygen supply intensity, dephosphorization effect is poor;
If 2 improve the series of problems such as oxygen supply intensity easily causes excessive slag, splash, the temperature rising is too fast, decarburization is too fast,
3, adopt special dephosphorization rifle can cause the problems such as replacing oxygen rifle impact smelting rhythm.
Summary of the invention
The Low-phosphorus Steel smelting process of the mixed oxygen blast gas of a kind of converter top-blow oxygen of the present invention rifle and nitrogen, cause that easily stirring intensity of molten pool reduces after having solved above-mentioned dephosphorizing pretreatment stage reduction oxygen supply intensity, the problems such as dephosphorization effect is poor can realize low-phosphorous, the even smelting of utmost point Low-phosphorus Steel.
The present invention adopts nitrogen and oxygen mix blowing to carry out dephosphorizing pretreatment, can effectively improve stirring intensity of molten pool, reduced dephosphorization and managed in advance the bath temperature in stage, simultaneously because the ratio of oxygen and nitrogen is adjustable, so bath temperature and change slag process can rationally be controlled.After dephosphorizing pretreatment finished, molten bath molten iron phosphorus content can be controlled at below 0.020%, and then the decarburization stage is carried out the routine blowing, and what the converter terminal phosphorus content was stable is controlled at below 0.006%.
Therefore, this technological advantage is, can adopt high phosphorus hot metal to smelt, and blowing steadily, speed of response is fast, efficient is high, also can adopt the method to produce utmost point Low-phosphorus Steel.
Principal feature of the present invention is to sneak into a part of nitrogen in converter dephosphorization pretreatment stage top blast oxygen, extends dephosphorization stage duration of blast, reduces dephosphorization stage bath temperature, improves the dephosphorizing method of stirring intensity of molten pool.Take converter with top and bottom complex blowing function as processing vessel, adopt argon bottom-blowing, nitrogen, top blast oxygen is smelted; Its processing step is:
(1) at first carry out the blowing in dephosphorization stage in converter, duration of blast is controlled at 6-9min, normally blows after deslagging;
(2) the top blast air feed in converter dephosphorization stage is the mixed gas of nitrogen and oxygen;
(3) raw material that uses of steel-making is molten iron steel scrap, scrap ratio 5%-15%.
Bessemerize and be divided into two stages, dephosphorization stage and decarburization stage; First carry out the smelting in dephosphorization stage, blow normally after deslagging again, the blowing of dephosphorization stage adopts oxygen to mix the method for blowing with nitrogen, and the mass ratio of gas: the mass ratio of oxygen and nitrogen is between 6:4～9:1.
Dephosphorization stage end temp is at 1300 ℃～1380 ℃; The converter terminal temperature is at 1650 ℃～1720 ℃;
Bessemerize and finish to pour out 1/2～2/3 slag after slag splashing, the residue slag is stayed in stove and is used as dissolving agent.
Adopt the advantage of this technique as follows:
1, when having reached low oxygen supply, the top blast air supply intensity does not reduce (the top blast stirring intensity does not reduce) owing to sneaking into a part of nitrogen in top-blown gas the dephosphorization stage;
2, reduce the control of dephosphorization stage bath temperature, improved the dephosphorization in dephosphorization stage;
3, realized that the finished product phosphorus content is lower than the smelting of low-phosphorous, the utmost point Low-phosphorus Steel of 60ppm;
4, can adopt high phosphorus hot metal to smelt, blowing is steady, dephosphorization efficient is high.
Embodiment
After the pre-treatment of employing molten iron converter dephosphorization, the method for deslagging, so carry out routine again and smelt.Dephosphorizing pretreatment adopts conventional 4 rifle positions, hole to blow, and first carries out dephosphorizing pretreatment in converter, and target takes off phosphorus content to below 0.020%, and carbon content control is in 3.2% left and right; In top-blown gas, oxygen mixes blowing with nitrogen, and oxygen and nitrogen mass ratio are between 9:1-6:4, and to the molten iron after dephosphorizing pretreatment, then first deslagging normally blows, and scrap ratio is below 12%.
After finishing, adopts dephosphorizing pretreatment normal discharge (22000 m
3/ h) the oxygen rifle is smelted; 2 tons of left and right of head batch slag lime add-on do not add light-burned; Add the ore slag, pour out the quantity of slag during deslagging more than 1/3, two batches of slags add 3 ~ 4 tons of limes.Terminal point hangs down temperature control, 1650 ℃ of target catch carbon temperature.
Embodiment: the molten iron Intake Quantity is at 100t, 98t, and adding amount of scrap steel is respectively 8t, 11t; The molten iron situation is as shown in table 1 below, and the blowing parameter is as shown in table 2 below.
Table 1 molten iron main component (quality percentage composition %, surplus is Fe)
| Case | Steel grade | C | Si | Mn | P | S | Molten iron temperature ℃ |
| 1 | X70 | 4.66 | 0.62 | 0.16 | 0.081 | 0.035 | 1299 |
| 2 | Q345R | 4.47 | 0.43 | 0.13 | 0.084 | 0.045 | 1302 |
Table 2 dephosphorization phase auxiliary material add-on
The dephosphorizing pretreatment stage was adopted duration of blast 6-8 minute, and the top blast oxygen supply intensity is 3.0M
3/ min/t, following table is result after dephosphorizing pretreatment.
Molten iron impurity component, temperature (quality percentage composition %, surplus is Fe) after table 3 dephosphorization finishes
| Case | Steel grade | C | P | S | Temperature ℃ |
| 1 | X70 | 3.22 | 0.023 | 0.013 | 1312 |
| 2 | Q345R | 2.82 | 0.017 | 0.015 | 1337 |
The main component (quality percentage composition %) of slag after the pre-treatment of table 4 dephosphorization of molten iron finishes
| Case is inferior | TFe | FeO | SiO 2 | CaO | MgO | P 2O 5 |
| 1 | 9.73 | 8.89 | 17.93 | 37.5 | 12.01 | 1.96 |
| 2 | 8.86 | 8.76 | 18.63 | 46.9 | 11.46 | 1.88 |
After dephosphorizing pretreatment finished, carbon period adopted flow 22000 Nm
3/ min.t, the converter terminal phosphorus content is 0.003%～0.005%.
Table 5 experimental converter end phosphorus content
| Case | Steel grade | Phosphorus content |
| 1 | X70 | 0.0043% |
| 2 | Q345R | 0.0032% |
Claims (4)
1. the Low-phosphorus Steel smelting process that converter top-blow oxygen rifle mixes oxygen blast gas and nitrogen, is characterized in that, processing step is:
(1) at first carry out the blowing in dephosphorization stage in converter, duration of blast is controlled at 6-9min, normally blows after deslagging;
(2) the top blast air feed in converter dephosphorization stage is the mixed gas of nitrogen and oxygen;
(3) raw material that uses of steel-making is molten iron steel scrap, scrap ratio 5%-15%.
2. method according to claim 1, is characterized in that, bessemerizes to be divided into two stages, dephosphorization stage and decarburization stage; First carry out the smelting in dephosphorization stage, blow normally after deslagging again, the blowing of dephosphorization stage adopts oxygen to mix the method for blowing with nitrogen, and the mass ratio of gas: the mass ratio of oxygen and nitrogen is between 6:4～9:1.
3. method according to claim 1, is characterized in that, dephosphorization stage end temp is at 1300 ℃～1380 ℃; The converter terminal temperature is at 1650 ℃～1720 ℃.
4. method according to claim 1, is characterized in that, bessemerizes and finish to pour out 1/2～2/3 slag after slag splashing, and the residue slag is stayed in stove and used as dissolving agent.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2013100594823A CN103160637A (en) | 2013-02-26 | 2013-02-26 | Low-phosphorous steel smelting method of mixed blowing of oxygen and nitrogen of top blowing oxygen lance of converter |
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| CN2013100594823A CN103160637A (en) | 2013-02-26 | 2013-02-26 | Low-phosphorous steel smelting method of mixed blowing of oxygen and nitrogen of top blowing oxygen lance of converter |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104774992A (en) * | 2015-05-04 | 2015-07-15 | 北京佰能电气技术有限公司 | Control device for converter steelmaking nitrogen-oxygen combined blowing |
| CN104928432A (en) * | 2015-06-11 | 2015-09-23 | 江苏永钢集团有限公司 | Method for removing phosphorus in converter through blowing nitrogen |
| CN107699660A (en) * | 2017-10-23 | 2018-02-16 | 徐州市博威机械制造有限公司 | A kind of iron and steel smelting process for reducing phosphorus content |
| CN111344421A (en) * | 2018-04-24 | 2020-06-26 | 日本制铁株式会社 | Method for dephosphorizing molten iron |
| CN113265505A (en) * | 2021-02-07 | 2021-08-17 | 首钢集团有限公司 | Smelting method of high-nitrogen steel |
| CN114807498A (en) * | 2022-05-20 | 2022-07-29 | 钢铁研究总院有限公司 | Efficient dephosphorization and decarbonization method for converter |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2057509A (en) * | 1979-08-30 | 1981-04-01 | Boc Ltd | Steel making in top-blown converter |
| CN1552919A (en) * | 2003-05-29 | 2004-12-08 | 宝山钢铁股份有限公司 | Converter oxide and nitrogen top-blown dephosphorizing method |
| CN102212640A (en) * | 2011-06-01 | 2011-10-12 | 首钢总公司 | Convertor steelmaking method capable of reducing slag quantity |
| CN102643946A (en) * | 2012-04-24 | 2012-08-22 | 北京科技大学 | Converter steelmaking method through power injection dephosphorization by adopting supersonic speed oxygen lance and supersonic speed oxygen lance |
| CN102808065A (en) * | 2012-08-30 | 2012-12-05 | 长春工业大学 | Method for argon-oxygen refining low-phosphorus ferrochrome |
| CN102899443A (en) * | 2012-10-23 | 2013-01-30 | 秦皇岛首秦金属材料有限公司 | Process for smelting low-phosphorous molten iron |
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2013
- 2013-02-26 CN CN2013100594823A patent/CN103160637A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2057509A (en) * | 1979-08-30 | 1981-04-01 | Boc Ltd | Steel making in top-blown converter |
| CN1552919A (en) * | 2003-05-29 | 2004-12-08 | 宝山钢铁股份有限公司 | Converter oxide and nitrogen top-blown dephosphorizing method |
| CN102212640A (en) * | 2011-06-01 | 2011-10-12 | 首钢总公司 | Convertor steelmaking method capable of reducing slag quantity |
| CN102643946A (en) * | 2012-04-24 | 2012-08-22 | 北京科技大学 | Converter steelmaking method through power injection dephosphorization by adopting supersonic speed oxygen lance and supersonic speed oxygen lance |
| CN102808065A (en) * | 2012-08-30 | 2012-12-05 | 长春工业大学 | Method for argon-oxygen refining low-phosphorus ferrochrome |
| CN102899443A (en) * | 2012-10-23 | 2013-01-30 | 秦皇岛首秦金属材料有限公司 | Process for smelting low-phosphorous molten iron |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104774992A (en) * | 2015-05-04 | 2015-07-15 | 北京佰能电气技术有限公司 | Control device for converter steelmaking nitrogen-oxygen combined blowing |
| CN104928432A (en) * | 2015-06-11 | 2015-09-23 | 江苏永钢集团有限公司 | Method for removing phosphorus in converter through blowing nitrogen |
| CN107699660A (en) * | 2017-10-23 | 2018-02-16 | 徐州市博威机械制造有限公司 | A kind of iron and steel smelting process for reducing phosphorus content |
| CN111344421A (en) * | 2018-04-24 | 2020-06-26 | 日本制铁株式会社 | Method for dephosphorizing molten iron |
| CN113265505A (en) * | 2021-02-07 | 2021-08-17 | 首钢集团有限公司 | Smelting method of high-nitrogen steel |
| CN113265505B (en) * | 2021-02-07 | 2022-06-21 | 首钢集团有限公司 | Smelting method of high-nitrogen steel |
| CN114807498A (en) * | 2022-05-20 | 2022-07-29 | 钢铁研究总院有限公司 | Efficient dephosphorization and decarbonization method for converter |
| CN114807498B (en) * | 2022-05-20 | 2024-01-02 | 钢铁研究总院有限公司 | Efficient dephosphorization and decarbonization method for converter |
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Application publication date: 20130619 |