CN103993121A - Method for enhancing end point carbon of high-carbon steel in molten iron/steel/semisteel smelting process - Google Patents
Method for enhancing end point carbon of high-carbon steel in molten iron/steel/semisteel smelting process Download PDFInfo
- Publication number
- CN103993121A CN103993121A CN201410250837.1A CN201410250837A CN103993121A CN 103993121 A CN103993121 A CN 103993121A CN 201410250837 A CN201410250837 A CN 201410250837A CN 103993121 A CN103993121 A CN 103993121A
- Authority
- CN
- China
- Prior art keywords
- steel
- weight
- oxygen
- molten iron
- carbon
- Prior art date
- 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.)
- Granted
Links
Landscapes
- Carbon Steel Or Casting Steel Manufacturing (AREA)
Abstract
The invention discloses a method for enhancing end point carbon of high-carbon steel in a semisteel smelting process, which comprises the following steps: adding semisteel molten iron after vanadium extraction into a converter; and sequentially adding iron silicon alloy and slagging auxiliary materials into the converter, wherein the addition amount of the iron silicon alloy is 4-8.5kg per ton of steel. On the basis of the method, the invention also discloses molten iron prepared by the method and steel prepared from the molten iron. On the premise of using the iron silicon alloy instead of the conventional common slag former, the end point carbon content is obviously enhanced as compared with the prior art, and the end point oxygen content is obviously lowered.
Description
Technical field
The present invention relates to metallurgical technology field, particularly, relate to a kind of method, a kind of molten iron and a kind of steel of semi-steel making raising medium and high carbon steel end point carbon.
Background technology
China's v-ti magnetite mineral deposit is widely distributed, reserves are abundant, reserves and produced quantity occupy the 3rd of national iron ore, 98.3 hundred million tons of proven reserve, prospective reserves reaches more than 30,000,000,000 tons, is mainly distributed in that Panxi, Sichuan (Flos Bombacis Malabarici-Xichang) area, Chengde are regional, the area such as Hanzhong Area of Shaanxi, Yun county, Hubei sun, area, Xiangyang, Xingning of Guangdong Province and Shanxi Dai County.Wherein, Pan Xi (Flos Bombacis Malabarici-Xichang) area is the Main Metallogenic band of China's vanadium titano-magnetite, is also one of the important producing region in similar mineral deposit in the world, and north and south is about 300km, has verified large-scale, oversized mineral deposit 7 places, 6 places, medium-sized mineral deposit.Navajoite resource is more, total retained reserve V
2o
52596 ten thousand tons, occupy the 3rd, the world.
Navajoite mainly originates among magma lithotype vanadium titano-magnetite bed, as associated minerals output.Navajoite is mainly Cambrian Black Shale-type navajoite as independent deposit.Navajoite is distributed more widely, has proven reserve in 19 provinces (district), and Sichuan vanadium reserves rank first in the whole country, and account for 49% of total reserves.
Because Panxi Diqu has unique v-ti magnetite ore resources, often adopt the vanadium titano-magnetite that picks up from Panxi Diqu at blast-furnace smelting.The molten iron of vanadium titano-magnetite is after vanadium extraction, the more general molten iron of carbon mass percent is wherein low, silicon, manganese heating slagging constituent content are vestige, therefore the half steel molten iron smelting of the v-ti magnetite of Panxi Diqu have that in converting process, acid slagging material is few, slag system constituent element is single, the feature such as slag formation time evening at initial stage and shortage of heat, this makes semi-steel making more difficult than molten iron-steelmaking, and Dephosphorization rate is lower.
And, because adding membership, slag former reduces half steel temperature, thermal source wretched insufficiency in smelting process, for ensureing terminal tapping temperature, existing technique only has the low catch carbon tapping of employing, can only rely on oxidation of coal heat release to improve terminal temperature, and then cause endpoint carbon content in 0.02-0.10 % by weight, endpoint molten steel oxygen activity reaches 0.042-0.100 % by weight, and in order to obtain medium and high carbon steel, usually need in tapping process, in ladle, add carburelant to improve carbon content.
Therefore, this area is needed badly and is found a kind of semi-steel making that can form for the vanadium titano-magnetite of smelting Panxi Diqu to improve the method for medium and high carbon steel end point carbon.
Summary of the invention
The object of this invention is to provide a kind of method that semi-steel making improves medium and high carbon steel end point carbon, the method can make the endpoint carbon content of semi-steel making improve under the prerequisite of controlling preferably slag state.
The present inventor completes technical scheme of the present invention based on following thinking: in the face of Panxi Diqu is abundant and unique v-ti magnetite ore resources, in the steelmaking process of being everlasting, add and contain SiO while adopting existing method for making steel
2, the composition such as FeO slag making materials.And in conventional slag making materials, contain a large amount of impurity such as P, S, the present inventor think this may be to smelting P, steel grade that S content is lower has a negative impact.And contriver recognizes, in practice process, common slag former add the temperature that usually can reduce by half steel water, thereby it is slower that slag former is melted, and then causes in steelmaking process, easily occurring returning dry phenomenon and causing slag difficulty.Therefore, the present inventor draws after studying based on above discovery: in half steel water of converter, add ferro-silicon to replace the SiO that contains of conventional use
2, the composition such as FeO common slag former while carrying out half steel slag making, ferro-silicon can melt fast, and can Quick Oxidation be SiO after oxygen blast
2, ferro-silicon oxidising process is exothermic process, can compensate again the temperature of half steel water while adding ferro-silicon, and the SiO of oxidation
2can participate in fast slag making, realize quick slag making.And, add ferrosilicon can compensate steel-making temperature, thereby realize high catch carbon tapping, while avoiding tapping, add carburelant, steel-making cost is reduced.
To achieve these goals, on the one hand, the invention provides a kind of method of semi-steel making raising medium and high carbon steel end point carbon, the method comprises: half steel water after vanadium extraction is added in converter; In described converter, add ferro-silicon and slag making auxiliary material successively again; The add-on of described ferro-silicon is 4-8.5kg/t
steel.
On the other hand, the present invention also provides a kind of molten iron that is improved the method acquisition of medium and high carbon steel end point carbon by semi-steel making of the present invention.
On the other hand, the present invention also provides a kind of and has improved the molten iron that the method for medium and high carbon steel end point carbon obtains and the steel that obtain by above-mentioned semi-steel making of the present invention.
Semi-steel making method of the present invention, being used in conjunction with under the prerequisite of the alternative conventional common slag former using of ferro-silicon, makes endpoint carbon content obviously improve compared with the result of prior art, and terminal oxygen level significantly reduces.
Other features and advantages of the present invention are described in detail the embodiment part subsequently.
Embodiment
Below the specific embodiment of the present invention is elaborated.Should be understood that, embodiment described herein only, for description and interpretation the present invention, is not limited to the present invention.
In the present invention, half steel water after described vanadium extraction refers to the molten iron of the molten state that vanadium-bearing hot metal obtains after desulfurization and vanadium extraction are processed.
In the present invention, described medium and high carbon steel refers to medium carbon steel and high carbon steel, i.e. the steel of endpoint carbon content more than 0.20 % by weight.
The invention provides a kind of method that semi-steel making improves medium and high carbon steel end point carbon, the method comprises: half steel water after vanadium extraction is added in converter; In described converter, add ferro-silicon and slag making auxiliary material successively again; The add-on of described ferro-silicon is 4-8.5kg/t
steel.
Oxygen level in half steel water after described vanadium extraction of the present invention can be more than 0.050 % by weight, more than being preferably 0.060 % by weight.
In method of the present invention, the add-on of described ferro-silicon is 4-8.5kg/t
steel,, with respect to half steel water that packs converter into per ton, the add-on of described ferro-silicon is 4-8.5kg.More preferably the add-on of described ferro-silicon is 6.5-8.5kg/t
steel.There is no particular limitation for the capacity of the converter of the present invention to splendid attire half steel water, and those skilled in the art can select according to practical situation, and the capacity of the converter of for example splendid attire half steel water in the present invention can be 200-230t.The present invention does not have special requirement to the form of described ferro-silicon, for example, can be granular ferro-silicon.
In method of the present invention, the Si that contains 70-80 % by weight in preferred described ferro-silicon and the Fe of 20-30 % by weight.It will be appreciated by persons skilled in the art that in method of the present invention, in described ferro-silicon, can also contain a small amount of impurity.
Under preferable case, in method of the present invention, described slag making auxiliary material comprises quickened lime and high magnesium lime.In the present invention, the quickened lime in described slag making auxiliary material and high magnesium lime can join respectively in converter, also can will after described quickened lime and high magnesium lime mixing, join in converter.Quickened lime and high magnesium lime in the preferred described slag making auxiliary material of the present invention join respectively in converter.There is no particular limitation to the form of described quickened lime and high magnesium lime for method of the present invention, and those skilled in the art can select according to conventional methods.
Particularly, in the method for the invention, the CaO that contains 85-90 % by weight in preferred described quickened lime.
Preferably, in the method for the invention, in described high magnesium lime, contain the CaO of 48-55 % by weight and the MgO of 30-40 % by weight.
Preferably, in method of the present invention, it is 3-4 that the add-on of described slag making auxiliary material makes basicity of slag.
More preferably in situation, it is 10-18kg/t that the consumption of described slag making auxiliary material makes the consumption of described quickened lime
steel, the consumption of described high magnesium lime is 10-20kg/t
steel.
In the present invention, the addition sequence of described ferro-silicon and slag making auxiliary material and add-on are controlled at the fusing that this scope is conducive to accelerate quickened lime.If add-on too much can cause bath temperature to decline too much, cause slag charge conglomeration and lime block surface to form layer of metal scull and postpone slagging; Add-on is crossed and is not reached at least dephosphorization effect.
In method of the present invention, preferably in top blowing oxygen process, control total blowing principle and be: Fast Slag Melting, morningization slag, slag is active, and process is not returned dry, not splash.
In method of the present invention, the method can also be included in to adding in described converter and start after slag making auxiliary material to oxygen supply in converter, and the method for described oxygen supply is top blowing oxygen.
In method of the present invention, described top blowing oxygen can comprise following three phases:
First stage: start to carry out top blowing oxygen 0-90s;
Subordinate phase: the carbon content in top blowing oxygen 90s to half steel water is 0.40-0.80 % by weight;
Phase III: the carbon content in half steel water is that 0.40-0.80 % by weight is to blow end point.
In method of the present invention, the time of preferred described top blowing oxygen is 9-15min.
The oxygen supply intensity of the preferred described subordinate phase of the present invention is than greatly at least 0.3m of the oxygen supply intensity of first stage
3/ (mint
steel), preferably large 0.3-2.0m
3/ (mint
steel), more preferably 0.5-1.8m
3/ (mint
steel).
In method of the present invention, the oxygen lance position of preferred described subordinate phase is than the low at least 0.2m of the oxygen lance position of first stage, preferred low 0.2-0.8m, more preferably 0.3-0.4m.
In method of the present invention, the oxygen supply intensity of preferred described first stage top blow oxygen lance is 1.5-2.5m
3/ (mint
steel), oxygen lance position is 1.8-2.5m.When starting to blow, in converter, reaction between carbon and oxygen is not also very violent, and the amount of oxygen of consumption is less, and now adopting the scheme of " low oxygen supply intensity, higher rifle position " is the oxidisability that can improve slag on the one hand, prevent that decarburization in early stage from heating up violent, cause the too fast dephosphorization that is unfavorable for of bath temperature rising; Can also prevent from the other hand early stage from returning dry because the too low blowing in rifle position causes.
In method of the present invention, the oxygen supply intensity of preferred described subordinate phase top blow oxygen lance is 2.5-3.5m
3/ (mint
steel), oxygen lance position is 1.5-2.5m.
In method of the present invention, the oxygen supply intensity of preferred described phase III top blow oxygen lance is 1.5-2.0m
3/ (mint
steel), oxygen lance position is 1.4-2.0m.
In method of the present invention, the composition of half steel water after preferred described vanadium extraction by percentage to the quality, comprises C:3.2-4.1 % by weight, Si:0.015-0.030 % by weight, Mn:0.020-0.040 % by weight, P:0.06-0.08 % by weight, S≤0.015 % by weight.
In method of the present invention, preferably the temperature of half steel water after vanadium extraction is 1300-1360 DEG C.
According to one of the present invention preferred embodiment, adopt technological process as described below to carry out semi-steel making:
Utilize 200-230t converter to carry out semi-steel making, wherein, half steel molten iron after vanadium extraction comprises C:3.2-4.1 % by weight, Si:0.015-0.030 % by weight, Mn:0.020-0.040 % by weight, P:0.06-0.08 % by weight, S≤0.015 % by weight, the charging temperature of described half steel water is 1300-1360 DEG C.
In converter, be blended into half steel water after vanadium extraction, add 6.5-8.5kg/t after having converted half steel water
steelferro-silicon, then in converter, add 10-18kg/t successively
steelquickened lime, 10-20kg/t
steelhigh magnesium lime (slag making auxiliary material).Lower rifle top blowing oxygen, starts to carry out top blowing oxygen, and in top blowing oxygen carries out 0-90s, top blow oxygen lance oxygen supply intensity is 1.5-2.5m
3/ (mint
steel), oxygen lance position is 1.8-2.5m; Carry out 90s while being 0.40-0.80 % by weight to carbon content of molten steel in oxygen blast, top blow oxygen lance oxygen supply intensity is 2.5-3.5m
3/ (mint
steel), oxygen lance position is 1.5-2.5m; From carbon content of molten steel be 0.40-0.80 % by weight to blow end point, controlling the oxygen supply intensity of top blow oxygen lance is 1.5-2.0m
3/ (mint
steel), oxygen lance position is 1.4-2.0m; The time of described top blowing oxygen is 9-15min.
The present invention also provides a kind of molten iron that is improved the method acquisition of medium and high carbon steel end point carbon by semi-steel making of the present invention.
Under preferable case, in the molten iron being obtained by aforesaid method of the present invention, carbon content is 0.20-0.30 % by weight, and phosphorus content is 0.006-0.015 % by weight.
The method according to this invention, the Oxygen Content of Molten Cast Iron preferably being obtained by aforesaid method of the present invention is 0.020-0.040 % by weight.
Under preferable case, the temperature of the molten iron being obtained by aforesaid method of the present invention is 1630-1660 DEG C.
On the other hand, the present invention also provides a kind of and has improved the molten iron that the method for medium and high carbon steel end point carbon obtains and the steel that prepare by above-mentioned semi-steel making of the present invention.
Adopt above-mentioned Semi-steel making method of the present invention to have the following advantages:
1. add early stage ferrosilicon oxidation can increase steel-making thermal source, realize high catch carbon tapping.
2. oxidation products SiO
2can participate in quick slag making.
3. more than endpoint carbon content is increased to 0.20 % by weight.
Below will describe the present invention by embodiment.In following examples, in case of no particular description, described material is all from being purchased.
In following examples:
In quickened lime, contain the CaO of 90 % by weight;
In high magnesium lime, contain the CaO of 55 % by weight and the MgO of 30 % by weight;
In ferro-silicon, contain the Si of 75 % by weight and the Fe of 25 % by weight.
Embodiment 1
Utilize 200t converter to carry out semi-steel making, wherein, the component content of half steel water after vanadium extraction is as shown in table 1 below, and the charging temperature of described half steel water is 1300 DEG C.The oxygen level of half steel water after vanadium extraction is 0.060 % by weight.
Table 1
| Composition | C | Si | Mn | P | S |
| Content (% by weight) | 3.3 | 0.015 | 0.030 | 0.06 | 0.012 |
In converter, be blended into half steel water after vanadium extraction, add 6.5kg/t after having converted half steel water
steelferro-silicon, then in converter, add 13kg/t successively
steelquickened lime, 16kg/t
steelhigh magnesium lime (slag making auxiliary material).Lower rifle top blowing oxygen, starts to carry out top blowing oxygen, and in top blowing oxygen carries out 0-90s, top blow oxygen lance oxygen supply intensity is 1.7m
3/ (mint
steel), oxygen lance position is 2.2m; Carry out 90s while being 0.5 % by weight to carbon content of molten steel in oxygen blast, top blow oxygen lance oxygen supply intensity is 2.7m
3/ (mint
steel), oxygen lance position is 1.9m; From carbon content of molten steel be 0.5 % by weight to blow end point, controlling the oxygen supply intensity of top blow oxygen lance is 1.95m
3/ (mint
steel), oxygen lance position is 1.9m.Then obtained molten iron A is tapped.The time of described top blowing oxygen is 11min.
Tapping temperature is 1645 DEG C; In molten iron A, carbon content is 0.26 % by weight, and oxygen level is 0.025 % by weight, and phosphorus content is 0.010 % by weight.
When method described in employing the present embodiment is carried out semi-steel making, the control of slag state is good, and the control of terminal hot metal composition is qualified, and terminal molten iron carbon content is high.
Embodiment 2
Utilize 200t converter to carry out semi-steel making, wherein, the component content of half steel water after vanadium extraction is as shown in table 2 below, and the charging temperature of described half steel water is 1360 DEG C.The oxygen level of half steel water after vanadium extraction is 0.060 % by weight.
Table 2
| Composition | C | Si | Mn | P | S |
| Content (% by weight) | 3.5 | 0.02 | 0.025 | 0.07 | 0.010 |
In converter, be blended into half steel water after vanadium extraction, add 7.5kg/t after having converted half steel water
steelferro-silicon, then in converter, add 15kg/t successively
steelquickened lime, 17kg/t
steelhigh magnesium lime (slag making auxiliary material).Lower rifle top blowing oxygen, starts to carry out top blowing oxygen, and in top blowing oxygen carries out 0-90s, top blow oxygen lance oxygen supply intensity is 2.5m
3/ (mint
steel), oxygen lance position is 2.4m; Carry out 90s while being 0.5 % by weight to carbon content of molten steel in oxygen blast, top blow oxygen lance oxygen supply intensity is 3.0m
3/ (mint
steel), oxygen lance position is 2.0m; From carbon content of molten steel be 0.5 % by weight to blow end point, controlling the oxygen supply intensity of top blow oxygen lance is 1.7m
3/ (mint
steel), oxygen lance position is 1.7m.Then obtained molten iron A is tapped.The time of described top blowing oxygen is 10min.
Tapping temperature is 1650 DEG C; In molten iron A, carbon content is 0.29 % by weight, and oxygen level is 0.036 % by weight, and phosphorus content is 0.009 % by weight.
When method described in employing the present embodiment is carried out semi-steel making, the control of slag state is good, and the control of terminal hot metal composition is qualified, and terminal molten iron carbon content is high.
Embodiment 3
Utilize 200t converter to carry out semi-steel making, wherein, the component content of half steel water after vanadium extraction is as shown in table 3 below, and the charging temperature of described half steel water is 1340 DEG C.The oxygen level of half steel water after vanadium extraction is 0.060 % by weight.
Table 3
| Composition | C | Si | Mn | P | S |
| Content (% by weight) | 4.0 | 0.03 | 0.040 | 0.08 | 0.010 |
In converter, be blended into half steel water after vanadium extraction, add 8.5kg/t after having converted half steel water
steelferro-silicon, then in converter, add 14kg/t successively
steelquickened lime, 16.5kg/t
steelhigh magnesium lime (slag making auxiliary material).Lower rifle top blowing oxygen, starts to carry out top blowing oxygen, and in top blowing oxygen carries out 0-90s, top blow oxygen lance oxygen supply intensity is 1.76m
3/ (mint
steel), oxygen lance position is 1.8m; Carry out 90s while being 0.6 % by weight to carbon content of molten steel in oxygen blast, top blow oxygen lance oxygen supply intensity is 3.4m
3/ (mint
steel), oxygen lance position is 1.5m; From carbon content of molten steel be 0.6 % by weight to blow end point, controlling the oxygen supply intensity of top blow oxygen lance is 1.6m
3/ (mint
steel), oxygen lance position is 1.52m.Then obtained molten iron A is tapped.The time of described top blowing oxygen is 12min.
Tapping temperature is 1660 DEG C; In molten iron A, carbon content is 0.30 % by weight, and oxygen level is 0.037 % by weight, and phosphorus content is 0.011 % by weight.
When method described in employing the present embodiment is carried out semi-steel making, the control of slag state is good, and the control of terminal hot metal composition is qualified, and terminal molten iron carbon content is high.
Comparative example 1
In converter, be blended into half steel water (oxygen level of half steel water after vanadium extraction is 0.060 % by weight) after vanadium extraction, add 21kg/t after having converted half steel water
steelcommon slag former (composition: the SiO of 55 % by weight
2, the CaO of 7 % by weight, the TFe of 15 % by weight, MnO, the P of 0.06 % by weight and the S of 0.08 % by weight of 6 % by weight, the H of 0.5 % by weight
2o, and other inevitable impurity), and then add successively 14kg/t in converter
steelquickened lime and 18kg/t
steelhigh magnesium lime.Lower rifle top blowing oxygen, starts to carry out top blowing oxygen, and in top blowing oxygen carries out 0-90s, top blow oxygen lance oxygen supply intensity is 1.7m
3/ (mint
steel), oxygen lance position is 2.4m; Carry out 90s while being 0.5 % by weight to carbon content of molten steel in oxygen blast, top blow oxygen lance oxygen supply intensity is 3.0m
3/ (mint
steel), oxygen lance position is 1.9m; From carbon content of molten steel be 0.5 % by weight to blow end point, controlling the oxygen supply intensity of top blow oxygen lance is 1.5m
3/ (mint
steel), oxygen lance position is 1.5m.Then obtained molten iron A is tapped.The time of described top blowing oxygen is 12min.
Tapping temperature is 1650 DEG C; In molten iron A, carbon content is 0.05 % by weight, and oxygen level is 0.059 % by weight, and phosphorus content is 0.011 % by weight.
While adopting method described in this comparative example to carry out semi-steel making, terminal molten iron carbon content is lower.
Comparative example 2
Adopt the operation identical with embodiment 1, in the method for this comparative example that different is, do not add ferro-silicon.
Tapping temperature is 1645 DEG C; In molten iron A, carbon content is 0.06 % by weight, and oxygen level is 0.060 % by weight, and phosphorus content is 0.012 % by weight.
While adopting method described in this comparative example to carry out semi-steel making, terminal molten iron carbon content is lower.
Embodiment 4
Adopt the method similar to embodiment 2 to carry out half steel slag making, difference is:
The add-on of described ferro-silicon is 5.5kg/t
steel.
The time of described top blowing oxygen is 10min.
Tapping temperature is 1650 DEG C; In molten iron A, carbon content is 0.23 % by weight, and oxygen level is 0.040 % by weight, and phosphorus content is 0.015 % by weight.
When method described in employing the present embodiment is carried out semi-steel making, the control of slag state is good, and the control of terminal hot metal composition is qualified, and terminal molten iron carbon content is higher.
Embodiment 5
Adopt the method similar to embodiment 3 to carry out half steel slag making, difference is:
The Fe of the Si that contains 65 % by weight in described ferro-silicon and 35 % by weight.
Tapping temperature is 1660 DEG C; In molten iron A, carbon content is 0.25 % by weight, and oxygen level is 0.039 % by weight, and phosphorus content is 0.014 % by weight.
When method described in employing the present embodiment is carried out semi-steel making, the control of slag state is good, and the control of terminal hot metal composition is qualified, and terminal molten iron carbon content is higher.
Embodiment 6
Adopt the method similar to embodiment 1 to carry out half steel slag making, difference is:
Lower rifle top blowing oxygen, starts to carry out top blowing oxygen, and in top blowing oxygen carries out 0-90s, top blow oxygen lance oxygen supply intensity is 2.5m
3/ (mint
steel), oxygen lance position is 2.2m; Carry out 90s while being 0.5 % by weight to carbon content of molten steel in oxygen blast, top blow oxygen lance oxygen supply intensity is 2.7m
3/ (mint
steel), oxygen lance position is 2.1m.
Tapping temperature is 1660 DEG C; In molten iron A, carbon content is 0.21 % by weight, and oxygen level is 0.040 % by weight, and phosphorus content is 0.012 % by weight.
When method described in employing the present embodiment is carried out semi-steel making, the control of slag state is good, and the control of terminal hot metal composition is qualified, and terminal molten iron carbon content is higher.
Embodiment 7
Adopt the method similar to embodiment 1 to carry out half steel slag making, difference is:
Lower rifle top blowing oxygen, starts to carry out top blowing oxygen, and in top blowing oxygen carries out 0-90s, top blow oxygen lance oxygen supply intensity is 2.5m
3/ (mint
steel), oxygen lance position is 2.2m; Carry out 90s while being 0.5 % by weight to carbon content of molten steel in oxygen blast, top blow oxygen lance oxygen supply intensity is 2.5m
3/ (mint
steel), oxygen lance position is 2.2m.
Tapping temperature is 1660 DEG C; Carbon content is 0.22 % by weight, and in molten iron A, oxygen level is 0.039 % by weight, and phosphorus content is 0.011 % by weight.
When method described in employing the present embodiment is carried out semi-steel making, the control of slag state is good, and the control of terminal hot metal composition is qualified, and terminal molten iron carbon content is higher.
Embodiment 8
Adopt the method similar to embodiment 1 to carry out half steel slag making, difference is:
Lower rifle top blowing oxygen, starts to carry out top blowing oxygen, and in top blowing oxygen carries out 0-90s, top blow oxygen lance oxygen supply intensity is 2.5m
3/ (mint
steel), oxygen lance position is 2.0m; Carry out 90s while being 0.5 % by weight to carbon content of molten steel in oxygen blast, top blow oxygen lance oxygen supply intensity is 2.3m
3/ (mint
steel), oxygen lance position is 2.2m.
Tapping temperature is 1660 DEG C; Carbon content is 0.21 % by weight, and in molten iron A, oxygen level is 0.039 % by weight, and phosphorus content is 0.013 % by weight.
When method described in employing the present embodiment is carried out semi-steel making, the control of slag state is good, and the control of terminal hot metal composition is qualified, and terminal molten iron carbon content is higher.
Embodiment 9
Adopt the method similar to embodiment 1 to carry out half steel slag making, difference is:
Lower rifle top blowing oxygen, starts to carry out top blowing oxygen, and in top blowing oxygen carries out 0-90s, top blow oxygen lance oxygen supply intensity is 1.4m
3/ (mint
steel), oxygen lance position is 1.7m; Carry out 90s while being 0.5 % by weight to carbon content of molten steel in oxygen blast, top blow oxygen lance oxygen supply intensity is 2.4m
3/ (mint
steel), oxygen lance position is 1.4m; From carbon content of molten steel be 0.5 % by weight to blow end point, controlling the oxygen supply intensity of top blow oxygen lance is 1.3m
3/ (mint
steel), oxygen lance position is 1.2m.
Tapping temperature is 1660 DEG C; Carbon content is 0.20 % by weight, and in molten iron A, oxygen level is 0.040 % by weight, and phosphorus content is 0.011 % by weight.
When method described in employing the present embodiment is carried out semi-steel making, the control of slag state is good, and the control of terminal hot metal composition is qualified, and terminal molten iron carbon content is higher.
Embodiment 10
Adopt the method similar to embodiment 1 to carry out half steel slag making, difference is: extend the top blowing oxygen time of phase III, the time that makes top blowing oxygen is 17min.
Tapping temperature is 1660 DEG C; In molten iron A, carbon content is 0.23 % by weight, and oxygen level is 0.040 % by weight, and phosphorus content is 0.013 % by weight.
When method described in employing the present embodiment is carried out semi-steel making, the control of slag state is good, and the control of terminal hot metal composition is qualified, and terminal molten iron carbon content is higher.
From above-mentioned example, Semi-steel making method of the present invention is using ferro-silicon to substitute under the prerequisite of the conventional common slag former using, coordinate above-mentioned Semi-steel making method to make endpoint carbon content obviously improve (as described in the background section, conventional endpoint carbon content is 0.02-0.10 % by weight) compared with the result of prior art.
More than describe the preferred embodiment of the present invention in detail; but the present invention is not limited to the detail in above-mentioned embodiment, within the scope of technical conceive of the present invention; can carry out multiple simple variant to technical scheme of the present invention, these simple variant all belong to protection scope of the present invention.
It should be noted that in addition, each concrete technical characterictic described in above-mentioned embodiment, in reconcilable situation, can combine by any suitable mode, for fear of unnecessary repetition, the present invention is to the explanation no longer separately of various possible array modes.
In addition, also can carry out arbitrary combination between various embodiment of the present invention, as long as it is without prejudice to thought of the present invention, it should be considered as content disclosed in this invention equally.
Claims (12)
1. semi-steel making improves a method for medium and high carbon steel end point carbon, it is characterized in that, the method comprises: half steel water after vanadium extraction is added in converter; In described converter, add ferro-silicon and slag making auxiliary material successively again; The add-on of described ferro-silicon is 4-8.5kg/t
steel.
2. method according to claim 1, wherein, the add-on of described ferro-silicon is 6.5-8.5kg/t
steel.
3. method according to claim 1 and 2, wherein, contains the Si of 70-80 % by weight and the Fe of 20-30 % by weight in described ferro-silicon.
4. method according to claim 1 and 2, wherein, described slag making auxiliary material comprises quickened lime and high magnesium lime;
The CaO that contains 85-90 % by weight in preferred described quickened lime, contains the CaO of 48-55 % by weight and the MgO of 30-40 % by weight in described high magnesium lime.
5. method according to claim 4, wherein, it is 10-18kg/t that the add-on of described slag making auxiliary material makes the consumption of described quickened lime
steel, the consumption of described high magnesium lime is 10-20kg/t
steel.
6. method according to claim 1 and 2, wherein, it is 3-4 that the add-on of described slag making auxiliary material makes basicity of slag.
7. method according to claim 1 and 2, wherein, the method is also included in to adding in described converter and starts after slag making auxiliary material to oxygen supply in converter, and the method for described oxygen supply is top blowing oxygen, and described top blowing oxygen comprises following three phases:
First stage: start to carry out top blowing oxygen 0-90s;
Subordinate phase: the carbon content in top blowing oxygen 90s to half steel water is 0.40-0.80 % by weight;
Phase III: the carbon content in half steel water is that 0.40-0.80 % by weight is to blow end point;
The time of preferred described top blowing oxygen is 9-15min.
8. method according to claim 7, wherein,
The oxygen supply intensity of described subordinate phase is than greatly at least 0.3m of the oxygen supply intensity of first stage
3/ (mint
steel), the oxygen lance position of described subordinate phase is than the low at least 0.2m of the oxygen lance position of first stage; Preferably,
The oxygen supply intensity of described first stage top blow oxygen lance is 1.5-2.5m
3/ (mint
steel), oxygen lance position is 1.8-2.5m;
The oxygen supply intensity of described subordinate phase top blow oxygen lance is 2.5-3.5m
3/ (mint
steel), oxygen lance position is 1.5-2.5m;
The oxygen supply intensity of described phase III top blow oxygen lance is 1.5-2.0m
3/ (mint
steel), oxygen lance position is 1.4-2.0m.
9. method according to claim 1 and 2, wherein, the composition of half steel water after described vanadium extraction is by weight percentage, comprise C:3.2-4.1 % by weight, Si:0.015-0.030 % by weight, Mn:0.020-0.040 % by weight, P:0.06-0.08 % by weight, S≤0.015 % by weight; The temperature of half steel water after described vanadium extraction is 1300-1360 DEG C.
10. the molten iron being obtained by the method described in any one in claim 1-9.
11. molten iron according to claim 10, is characterized in that, in described molten iron, carbon content is 0.20-0.30 % by weight, and phosphorus content is 0.006-0.015 % by weight, and oxygen level is 0.020-0.040 % by weight.
12. 1 kinds of steel that obtained by the molten iron described in any one in claim 10-11.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410250837.1A CN103993121B (en) | 2014-06-06 | 2014-06-06 | A kind of method of molten iron and steel and semi-steel making raising medium and high carbon steel end point carbon |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410250837.1A CN103993121B (en) | 2014-06-06 | 2014-06-06 | A kind of method of molten iron and steel and semi-steel making raising medium and high carbon steel end point carbon |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103993121A true CN103993121A (en) | 2014-08-20 |
| CN103993121B CN103993121B (en) | 2016-02-03 |
Family
ID=51307448
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410250837.1A Active CN103993121B (en) | 2014-06-06 | 2014-06-06 | A kind of method of molten iron and steel and semi-steel making raising medium and high carbon steel end point carbon |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103993121B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105506213A (en) * | 2016-01-19 | 2016-04-20 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for lowering oxygen activity of semisteel smelting end point molten steel |
| CN107151723A (en) * | 2017-05-09 | 2017-09-12 | 攀钢集团攀枝花钢铁研究院有限公司 | Double slags stay the Semi-steel making method of slag entirely |
| CN112646943A (en) * | 2020-12-17 | 2021-04-13 | 攀钢集团西昌钢钒有限公司 | Method for controlling dry dedusting explosion venting in semisteel smelting |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102766722A (en) * | 2012-07-17 | 2012-11-07 | 攀钢集团研究院有限公司 | Method for smelting high-carbon steel from semi-steel |
| CN103627842A (en) * | 2013-11-14 | 2014-03-12 | 攀钢集团研究院有限公司 | Method for enhancing end point carbon content in smelting medium-carbon steel from semisteel and semisteel steelmaking method |
| CN103627843A (en) * | 2013-11-28 | 2014-03-12 | 攀钢集团研究院有限公司 | Slagging method in semisteel steelmaking and semisteel steelmaking method |
| CN103642971A (en) * | 2013-11-13 | 2014-03-19 | 攀钢集团研究院有限公司 | Method for improving steelmaking end-point carbon content of semisteel and semisteel steelmaking method |
| CN103642966A (en) * | 2013-11-13 | 2014-03-19 | 攀钢集团研究院有限公司 | Method for improving high-carbon high-manganese steel converter smelting endpoint carbon content and steelmaking method |
-
2014
- 2014-06-06 CN CN201410250837.1A patent/CN103993121B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102766722A (en) * | 2012-07-17 | 2012-11-07 | 攀钢集团研究院有限公司 | Method for smelting high-carbon steel from semi-steel |
| CN103642971A (en) * | 2013-11-13 | 2014-03-19 | 攀钢集团研究院有限公司 | Method for improving steelmaking end-point carbon content of semisteel and semisteel steelmaking method |
| CN103642966A (en) * | 2013-11-13 | 2014-03-19 | 攀钢集团研究院有限公司 | Method for improving high-carbon high-manganese steel converter smelting endpoint carbon content and steelmaking method |
| CN103627842A (en) * | 2013-11-14 | 2014-03-12 | 攀钢集团研究院有限公司 | Method for enhancing end point carbon content in smelting medium-carbon steel from semisteel and semisteel steelmaking method |
| CN103627843A (en) * | 2013-11-28 | 2014-03-12 | 攀钢集团研究院有限公司 | Slagging method in semisteel steelmaking and semisteel steelmaking method |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105506213A (en) * | 2016-01-19 | 2016-04-20 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for lowering oxygen activity of semisteel smelting end point molten steel |
| CN107151723A (en) * | 2017-05-09 | 2017-09-12 | 攀钢集团攀枝花钢铁研究院有限公司 | Double slags stay the Semi-steel making method of slag entirely |
| CN112646943A (en) * | 2020-12-17 | 2021-04-13 | 攀钢集团西昌钢钒有限公司 | Method for controlling dry dedusting explosion venting in semisteel smelting |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103993121B (en) | 2016-02-03 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102212643B (en) | Converter less-slag smelting process | |
| CN102776314B (en) | Smelting method of ultra-low phosphorus steel | |
| CN102965463B (en) | Efficient dephosphorization process for converter | |
| CN103352101B (en) | Low-cost smelting process for converter | |
| CN103243192A (en) | Converter smelting method for rapidly and efficiently dephosphorizing low-basicity dephosphorization slag | |
| CN101294230B (en) | Duplex steelmaking technique of revolving furnace | |
| CN103993120B (en) | A kind of method of semisteel smelting low-sulfur steel | |
| CN105132611B (en) | Method for producing ultra-low phosphorous steel through single slag of converter | |
| CN103627843B (en) | Semi-steel making slagging method and Semi-steel making method | |
| CN104878153A (en) | Converter dephosphorization method for high-phosphorus low-silicon molten iron | |
| CN104195290A (en) | Molten steel dephosphorization agent and molten steel dephosphorization refining method | |
| CN103146873A (en) | Enriching sludge ball for semisteel steelmaking and slagging method for semisteel steelmaking | |
| CN103993121B (en) | A kind of method of molten iron and steel and semi-steel making raising medium and high carbon steel end point carbon | |
| CN108754062A (en) | A kind of method of the interior gasification dephosphorization steel-making of converter steel slag hearth | |
| CN103993123B (en) | A kind of method of molten iron and steel and semi-steel making reduction terminal oxygen level | |
| CN103993119B (en) | A kind of method of half steel slag making | |
| CN103966389A (en) | Method of utilizing semisteel to smelt high-carbon steel | |
| CN104109727B (en) | The method of half steel converter smelting Low-phosphorus Steel | |
| CN104060017B (en) | A kind of method of semisteel converter steelmaking | |
| CN104805249B (en) | Double slags stay the slagging method of slag semi-steel making | |
| CN103966387B (en) | Adopt the method for semi-steel making | |
| CN104004878B (en) | A kind of method improving semi-steel making Mn yield of alloy | |
| CN105483316A (en) | Direct alloying method of chrome ores in converter | |
| CN103993124B (en) | A kind of method improving semi-steel making Si yield of alloy | |
| CN104046748A (en) | Molten steel dephosphorizing agent and molten steel dephosphorizing method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |