CN111187985A - Hot-rolled extending flange steel with high hole expansion performance and fatigue life and preparation process thereof - Google Patents
Hot-rolled extending flange steel with high hole expansion performance and fatigue life and preparation process thereof Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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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
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
- C21C5/30—Regulating or controlling the blowing
- C21C5/35—Blowing from above and through the bath
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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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- 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
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- 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
- C21C7/10—Handling in a vacuum
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
- C22C33/06—Making ferrous alloys by melting using master alloys
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/26—Ferrous alloys, e.g. steel alloys containing chromium with niobium or tantalum
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/38—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of manganese
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Abstract
The invention provides a hot-rolled extended flange steel with high hole expansion performance and fatigue life, which is characterized in that: the steel grade comprises the following components in percentage by mass: 0.02 to 0.08%, Si: 0.30-0.60%, Mn: 1.3-1.70%, S: 0.001-0.005%, P: 0.005-0.015%, Cr: 0.10 to 0.40%, Al: 0.02 to 0.07%, Ca: 0.0010-0.0050%, Nb: 0.01-0.06%, O: 0.0006-0.0020%, N: 0.0010-0.0040% and the balance of Fe and other inevitable impurities. Simultaneously, the preparation process of the steel grade is also provided: molten iron pre-desulfurization treatment → converter smelting → double-station refining treatment → continuous casting → heating → hot continuous rolling → controlled cooling → coiling.
Description
Technical Field
The invention provides a hot rolled stretch-flange steel with high hole expansion performance and fatigue life, and also provides a preparation process of the steel.
Background
With the increasing requirements on light weight and performance of automobiles, the steel plate for the automobile structural member develops towards high strength and high toughness, and reports are reported according to related data: when the vehicle weight is reduced by 1%, the fuel consumption of the automobile is reduced by 0.6-1.0%. Along with the reduction of the weight of the automobile, the fuel consumption of the automobile is reduced, and the braking performance is improved obviously. Foreign automobile manufacturers have been working on: the research on the reduction of the weight of the wheel by improving the strength of the material, the automobile structural member materials in the U.S., Japan and Korea are used to the 600MPa level, but the steel plate still needs to have high plastic toughness after the strength is improved so as to be beneficial to the cold stamping forming performance, the original steel grade can not meet the use requirements of users, the upgrading and the updating of the material are urgently needed, and the new material needs to have higher strength, good plastic toughness, excellent forming performance, high-temperature creep resistance, fatigue resistance and the like so as to achieve the purposes of reducing the weight of the automobile, reducing the oil consumption and improving the safety while increasing the load.
The application of high-strength steel to automobile parts and the combination of the optimal lightweight design are core ways for realizing the lightweight of automobiles, but a series of technical bottlenecks exist in the application process. The method has the advantages that firstly, the forming difficulty is high, the die is seriously abraded and rebounded, the yield stress of high-strength steel is large, the plasticity is poor, the plastic forming of the automobile part is realized, the tonnage of a required press machine/spinning machine/rolling machine is large, and the load borne by the die is obviously increased in the forming process, so that the die is seriously abraded, the service life is reduced, and meanwhile, the phenomenon that the precision of the automobile part is poor and even the forming crack occurs due to the large rebounding amount after the forming; secondly, the welding difficulty is increased, when the high-strength steel is welded, due to the fact that other alloy elements are added to the new material, the structure and the components of a welding line are changed greatly, the change will affect the fatigue life of a product, and only if the problems are solved thoroughly, the use of the high-strength steel on automobile parts can be really promoted, and the light weight of an automobile is achieved.
Disclosure of Invention
In view of the above problems, the present invention provides a hot rolled stretch flange steel having high hole expansibility and fatigue life, the steel having a composition comprising, in mass percent, C: 0.02 to 0.08%, Si: 0.30-0.60%, Mn: 1.3-1.70%, S: 0.001-0.005%, P: 0.005-0.015%, Cr: 0.10 to 0.40%, Al: 0.02 to 0.07%, Ca: 0.0010-0.0050%, Nb: 0.01-0.06%, O: 0.0006-0.0020%, N: 0.0010-0.0040% and the balance of Fe and other inevitable impurities.
Also provided is a process for preparing the hot rolled extended flange steel having high hole expansibility and fatigue life, comprising the steps of,
1) firstly, carrying out molten iron pretreatment, and adding mixed powder of magnesium powder and lime powder into a molten iron tank, wherein the weight percentage of the magnesium powder to the lime powder is 1: 4, detecting and controlling the sulfur in the molten iron to be less than or equal to 0.003%;
2) pouring molten iron into a combined blowing converter for smelting, adding lime and light burned dolomite into the converter for slagging in the smelting process of the 180-ton converter, blowing oxygen to homogenize molten steel components, and tapping after the oxygen blowing is finished;
3) the tapping temperature is kept at 1675-1690 ℃, and the slag discharge amount is controlled to be less than or equal to 6 kilograms per ton of steel; adding ferrosilicon alloy in the tapping process to ensure that the molten steel components meet the tapping requirement;
4) sending the molten steel into a ladle refining furnace LF furnace, adding a deoxidizer according to the alloy content of the target molten steel, keeping the steel slag in the furnace at 30-50mm, sending the steel slag into a vacuum refining furnace for vacuum treatment, casting the steel slag into a continuous casting billet when the components and the temperature of the molten steel reach the component target values of the steel grade, heating the steel slag by a heating furnace, and sending the steel slag to a hot continuous rolling unit for rolling to obtain the steel grade.
Further, the deoxidizer in the step 4) adopts a silicon-aluminum-barium-strontium-calcium composite material, and the adding amount of the deoxidizer is that 480 kilograms of 420-strontium-calcium composite material are added into 180 tons of molten steel in each furnace.
Further, in the oxygen blowing operation, oxygen is blown to molten iron through an oxygen lance for 17 to 18 minutes, and nitrogen is blown from the bottom of the converter.
Further, adding niobium, manganese, chromium and silicon into the LF ladle refining furnace in the step 4), and adjusting the alloy content in the steel.
Further, in the step 4), argon is blown from the bottom for refining.
The advantages of the invention are as follows:
(1) the optimized alloy design concept adopts noble metals such as molybdenum, nickel and the like, and adds a proper amount of Nb and Cr, so that the transformation temperature of the steel can be reduced, the effect of refining crystal grains is achieved, the carbon content and the carbon equivalent of the steel are reduced, the strength, the toughness and the welding performance of the steel are greatly improved, and the comprehensive performance of the steel is improved;
(2) the technology of molten iron pre-desulfurization treatment, converter top and bottom combined blowing, external refining (LF + RH treatment), special inclusion treatment, continuous casting process and the like is adopted, so that the stability of the chemical components of the steel is improved, and the inclusions in the steel are subjected to denaturation treatment;
(3) the pure steel smelting technology is applied to the production of high-reaming steel, the molten iron [ S ] is controlled to be less than or equal to 0.0003%, and the top slag thickness after the molten iron is subjected to slag removal is less than or equal to 20 mm; adopting fine material scrap steel; active high-quality lime is adopted for smelting molten steel; the smelting operation level is improved, and the success of primary carbon drawing is ensured; the refining process adopts an optimized slagging mode of quantitative addition, strictly controls the contents of oxygen, nitrogen, phosphorus and sulfur in molten steel, and improves the purity of the molten steel. The steel meets the requirements of domestic automobile manufacturers to the maximum extent, has excellent performance, greatly enhances the competitive capacity of the steel products in the international market and the domestic market, and reduces the production cost of enterprises.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example 1
Firstly, carrying out molten iron pretreatment, and adding mixed powder of magnesium powder and lime powder into a molten iron tank, wherein the weight percentage of the magnesium powder to the lime powder is 1: 4, detecting, controlling the sulfur in the molten iron to be less than or equal to 0.003 percent, pouring the molten iron into a re-blowing converter for smelting, adding lime and light-burned dolomite for slagging into the converter in the smelting process of a 180-ton converter, blowing oxygen into the molten iron for 18 minutes by an oxygen lance so as to perform decarburization, blowing nitrogen from the bottom of the converter, homogenizing the components of the molten steel, tapping after the oxygen blowing is finished, keeping the tapping temperature at 1690 ℃, and controlling the slag discharge amount to be less than or equal to 6 kilograms per ton of steel; adding ferrosilicon alloy in the tapping process to ensure that the molten steel components meet the tapping requirement; then sending the molten steel into a ladle refining furnace LF, adding niobium, manganese, chromium and silicon into the ladle refining furnace LF according to the alloy content of the target molten steel, adjusting the alloy content in the steel, simultaneously adding a deoxidizer, wherein the deoxidizer adopts a silicon-aluminum-barium-strontium-calcium composite material, the adding amount of the slag is 420 kg per furnace steel (180 tons of molten steel), the steel slag in the furnace is kept at 30mm, the slag is refined in a mode of blowing argon from the bottom, after the components of the molten steel basically reach the target components, and (2) sending the steel to a vacuum refining furnace for vacuum treatment, mainly removing hydrogen, nitrogen and oxygen in the steel, removing impurities in the steel, sending the steel to a continuous casting machine for casting when the components and the temperature of the molten steel reach target values, bending, straightening and cutting the steel to form a continuous casting billet, heating the continuous casting billet by a heating furnace, and sending the continuous casting billet to a hot continuous rolling mill for rolling, namely the hot-rolled extended flanged steel with high hole expansion performance and fatigue life. The steel grade comprises the following components in percentage by mass: c: 0.055%, Si: 0.41%, Mn: 1.46%, S: 0.002%, P: 0.006%, Cr: 0.21%, Al: 0.02%, Ca: 0.0010%, Nb: 0.015%, O: 0.0008%, N: 0.0015 percent, and the balance of Fe and other inevitable impurities
Example 2
Firstly, carrying out molten iron pretreatment, and adding mixed powder of magnesium powder and lime powder into a molten iron tank, wherein the weight percentage of the magnesium powder to the lime powder is 1: 4, detecting, controlling the sulfur in the molten iron to be less than or equal to 0.003 percent, pouring the molten iron into a re-blowing converter for smelting, adding lime and light-burned dolomite for slagging into the converter in the smelting process of a 180-ton converter, blowing oxygen into the molten iron for 17 minutes by an oxygen lance so as to decarbonize, blowing nitrogen from the bottom of the converter, homogenizing the components of the molten steel, tapping after the oxygen blowing is finished, keeping the tapping temperature at 1675 ℃, and controlling the slag amount to be less than or equal to 6 kilograms per ton of steel; adding ferrosilicon alloy in the tapping process to ensure that the molten steel components meet the tapping requirement; then sending the molten steel into a ladle refining furnace LF, adding niobium, manganese, chromium and silicon into the ladle refining furnace LF according to the alloy content of the target molten steel, adjusting the alloy content in the steel, simultaneously adding a deoxidizer, wherein the deoxidizer adopts a silicon-aluminum-barium-strontium-calcium composite material, the adding amount of the slag is 450 kg per furnace steel (180 tons of molten steel), the steel slag in the furnace is kept at 50mm, the slag is refined in a mode of blowing argon from the bottom, after the components of the molten steel basically reach the target components, and (2) sending the steel to a vacuum refining furnace for vacuum treatment, mainly removing hydrogen, nitrogen and oxygen in the steel, removing impurities in the steel, sending the steel to a continuous casting machine for casting when the components and the temperature of the molten steel reach target values, bending, straightening and cutting the steel to form a continuous casting billet, heating the continuous casting billet by a heating furnace, and sending the continuous casting billet to a hot continuous rolling mill for rolling, namely the hot-rolled extended flanged steel with high hole expansion performance and fatigue life. The steel grade comprises the following components in percentage by mass: c: 0.065%, Si: 0.47%, Mn: 1.55%, S: 0.003%, P: 0.012%, Cr: 0.27%, Al: 0.07%, Ca: 0.004%, Nb: 0.021%, O: 0.0015%, N: 0.0024 percent, and the balance of Fe and other inevitable impurities
Example 3
Firstly, carrying out molten iron pretreatment, and adding mixed powder of magnesium powder and lime powder into a molten iron tank, wherein the weight percentage of the magnesium powder to the lime powder is 1: 4, detecting, controlling the sulfur in the molten iron to be less than or equal to 0.003 percent, pouring the molten iron into a re-blowing converter for smelting, adding lime and light-burned dolomite for slagging into the converter in the smelting process of a 180-ton converter, blowing 17 minutes and 45 seconds of oxygen into the molten iron through an oxygen lance so as to decarbonize, blowing nitrogen from the bottom of the converter, homogenizing the components of the molten steel, tapping after the oxygen blowing is finished, keeping the tapping temperature at 1680 ℃, and controlling the slag amount to be less than or equal to 6 kilograms per ton of steel; adding ferrosilicon alloy in the tapping process to ensure that the molten steel components meet the tapping requirement; then sending the molten steel into a ladle refining furnace LF, adding niobium, manganese, chromium and silicon into the ladle refining furnace LF according to the alloy content of the target molten steel, adjusting the alloy content in the steel, simultaneously adding a deoxidizer, wherein the deoxidizer adopts a silicon-aluminum-barium-strontium-calcium composite material, the adding amount of the slag is 480 kilograms per furnace steel (180 tons of molten steel), the steel slag in the furnace is kept at 40mm, the slag is refined in a mode of blowing argon from the bottom, after the components of the molten steel basically reach the target components, and (2) sending the steel to a vacuum refining furnace for vacuum treatment, mainly removing hydrogen, nitrogen and oxygen in the steel, removing impurities in the steel, sending the steel to a continuous casting machine for casting when the components and the temperature of the molten steel reach target values, bending, straightening and cutting the steel to form a continuous casting billet, heating the continuous casting billet by a heating furnace, and sending the continuous casting billet to a hot continuous rolling mill for rolling, namely the hot-rolled extended flanged steel with high hole expansion performance and fatigue life. The steel grade comprises the following components in percentage by mass: c: 0.07%, Si: 0.48%, Mn: 1.60%, S: 0.005%, P: 0.015%, Cr: 0.29%, Al: 0.06%, Ca: 0.005%, Nb: 0.031%, O: 0.0020%, N: 0.0037 percent, and the balance of Fe and other inevitable impurities
Example 4
Firstly, carrying out molten iron pretreatment, and adding mixed powder of magnesium powder and lime powder into a molten iron tank, wherein the weight percentage of the magnesium powder to the lime powder is 1: 4, detecting, controlling the sulfur in the molten iron to be less than or equal to 0.003 percent, pouring the molten iron into a re-blowing converter for smelting, adding lime and light-burned dolomite for slagging into the converter in the smelting process of a 180-ton converter, blowing 17 minutes and 45 seconds of oxygen into the molten iron through an oxygen lance so as to decarbonize, blowing nitrogen from the bottom of the converter, homogenizing the components of the molten steel, tapping after the oxygen blowing is finished, keeping the tapping temperature at 1680 ℃, and controlling the slag amount to be less than or equal to 6 kilograms per ton of steel; adding ferrosilicon alloy in the tapping process to ensure that the molten steel components meet the tapping requirement; then sending the molten steel into a ladle refining furnace LF, adding niobium, manganese, chromium and silicon into the ladle refining furnace LF according to the alloy content of the target molten steel, adjusting the alloy content in the steel, simultaneously adding a deoxidizer, wherein the deoxidizer adopts a silicon-aluminum-barium-strontium-calcium composite material, the adding amount of the slag is 480 kilograms per furnace steel (180 tons of molten steel), the steel slag in the furnace is kept at 40mm, the slag is refined in a mode of blowing argon from the bottom, after the components of the molten steel basically reach the target components, and (2) sending the steel to a vacuum refining furnace for vacuum treatment, mainly removing hydrogen, nitrogen and oxygen in the steel, removing impurities in the steel, sending the steel to a continuous casting machine for casting when the components and the temperature of the molten steel reach target values, bending, straightening and cutting the steel to form a continuous casting billet, heating the continuous casting billet by a heating furnace, and sending the continuous casting billet to a hot continuous rolling mill for rolling, namely the hot-rolled extended flanged steel with high hole expansion performance and fatigue life.
The steel grade comprises the following components in percentage by mass: c: 0.02%, Si: 0.30%, Mn: 1.7%, S: 0.001%, P: 0.006%, Cr: 0.4%, Al: 0.03%, Ca: 0.003%, Nb: 0.01%, O: 0.0007%, N: 0.001%, and the balance of Fe and other inevitable impurities
Example 5
Firstly, carrying out molten iron pretreatment, and adding mixed powder of magnesium powder and lime powder into a molten iron tank, wherein the weight percentage of the magnesium powder to the lime powder is 1: 4, detecting, controlling the sulfur in the molten iron to be less than or equal to 0.003 percent, pouring the molten iron into a re-blowing converter for smelting, adding lime and light-burned dolomite for slagging into the converter in the smelting process of a 180-ton converter, blowing 17 minutes and 45 seconds of oxygen into the molten iron through an oxygen lance so as to decarbonize, blowing nitrogen from the bottom of the converter, homogenizing the components of the molten steel, tapping after the oxygen blowing is finished, keeping the tapping temperature at 1680 ℃, and controlling the slag amount to be less than or equal to 6 kilograms per ton of steel; adding ferrosilicon alloy in the tapping process to ensure that the molten steel components meet the tapping requirement; then sending the molten steel into a ladle refining furnace LF, adding niobium, manganese, chromium and silicon into the ladle refining furnace LF according to the alloy content of the target molten steel, adjusting the alloy content in the steel, simultaneously adding a deoxidizer, wherein the deoxidizer adopts a silicon-aluminum-barium-strontium-calcium composite material, the adding amount of the slag is 480 kilograms per furnace steel (180 tons of molten steel), the steel slag in the furnace is kept at 40mm, the slag is refined in a mode of blowing argon from the bottom, after the components of the molten steel basically reach the target components, and (2) sending the steel to a vacuum refining furnace for vacuum treatment, mainly removing hydrogen, nitrogen and oxygen in the steel, removing impurities in the steel, sending the steel to a continuous casting machine for casting when the components and the temperature of the molten steel reach target values, bending, straightening and cutting the steel to form a continuous casting billet, heating the continuous casting billet by a heating furnace, and sending the continuous casting billet to a hot continuous rolling mill for rolling, namely the hot-rolled extended flanged steel with high hole expansion performance and fatigue life.
The steel grade comprises the following components in percentage by mass: c: 0.08%, Si: 0.60%, Mn: 1.3%, S: 0.003%, P: 0.005%, Cr: 0.1%, Al: 0.04%, Ca: 0.0030%, Nb: 0.06%, O: 0.001%, N: 0.004%, and the balance of Fe and other inevitable impurities
The hot rolled extended flange steels prepared in examples 1 to 5 above were subjected to the steel grade performance and hole expansibility tests, and the results are shown in the following table:
TABLE 1 results of the performance tests of the steel grades of the examples
TABLE 2 reaming Performance testing of the examples
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (6)
1. A hot rolled extended flange steel having high hole expansion and fatigue life, characterized by: the steel grade comprises the following components in percentage by mass: 0.02 to 0.08%, Si: 0.30-0.60%, Mn: 1.3-1.70%, S: 0.001-0.005%, P: 0.005-0.015%, Cr: 0.10 to 0.40%, Al: 0.02 to 0.07%, Ca: 0.0010-0.0050%, Nb: 0.01-0.06%, O: 0.0006-0.0020%, N: 0.0010-0.0040% and the balance of Fe and other inevitable impurities.
2. A process for preparing hot rolled extended flange steel having high hole expansion performance and fatigue life, comprising: comprises the following steps of (a) carrying out,
1) firstly, carrying out molten iron pretreatment, and adding mixed powder of magnesium powder and lime powder into a molten iron tank, wherein the weight percentage of the magnesium powder to the lime powder is 1: 4, controlling the sulfur in the molten iron to be less than or equal to 0.003 percent;
2) pouring molten iron into a combined blowing converter for smelting, adding lime and light burned dolomite into the converter for slagging in the smelting process of the 180-ton converter, blowing oxygen to homogenize molten steel components, and tapping after the oxygen blowing is finished;
3) the tapping temperature is kept at 1675-1690 ℃, and the slag discharge amount is controlled to be less than or equal to 6 kilograms per ton of steel; adding ferrosilicon alloy in the tapping process to ensure that the molten steel components meet the tapping requirement;
4) sending the molten steel into a ladle refining furnace LF furnace, adding a deoxidizer according to the alloy content of the target molten steel, keeping the steel slag in the furnace at 30-50mm, sending the steel slag into a vacuum refining furnace for vacuum treatment, casting the steel slag into a continuous casting billet when the components and the temperature of the molten steel reach the component target values of the steel grade, heating the steel slag by a heating furnace, and sending the steel slag to a hot continuous rolling unit for rolling to obtain the steel grade.
3. A process for the preparation of hot rolled stretch flange steel with high hole expansion and fatigue life according to claim 2, wherein: in the step 4), the deoxidizer is a silicon-aluminum-barium-strontium-calcium composite material, and the adding amount of the deoxidizer is 480 kilograms of 420-sand-calcium in 180 tons of molten steel in each furnace.
4. A process for the preparation of hot rolled stretch flange steel with high hole expansion and fatigue life according to claim 2, wherein: in the oxygen blowing operation, oxygen is blown into the molten steel in the converter from the top through the oxygen lance for 17 to 18 minutes, and nitrogen or argon is blown from the bottom of the converter.
5. A process for the preparation of hot rolled stretch flange steel with high hole expansion and fatigue life according to claim 2, wherein: and 4) adding niobium, manganese, chromium and silicon into the LF ladle refining furnace in the step 4), and adjusting the alloy content in the steel.
6. A process for the preparation of hot rolled stretch flange steel with high hole expansion and fatigue life according to claim 2, wherein: and 4) refining by blowing argon from the bottom and stirring.
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