CN112593038A - Smelting and pouring process of L245 pipeline steel - Google Patents
Smelting and pouring process of L245 pipeline steel Download PDFInfo
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- CN112593038A CN112593038A CN202011536126.2A CN202011536126A CN112593038A CN 112593038 A CN112593038 A CN 112593038A CN 202011536126 A CN202011536126 A CN 202011536126A CN 112593038 A CN112593038 A CN 112593038A
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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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/16—Controlling or regulating processes or operations
- B22D11/18—Controlling or regulating processes or operations for pouring
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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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- 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
- C21C7/0056—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00 using cored wires
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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
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/076—Use of slags or fluxes as treating agents
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- 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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- 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
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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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
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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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
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
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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
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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- Mechanical Engineering (AREA)
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- Treatment Of Steel In Its Molten State (AREA)
Abstract
The invention discloses a smelting and pouring process of L245 pipeline steel, and relates to the technical field of metallurgical steelmaking. The method strictly controls the production steps of the L245 pipeline steel, and comprises the steps of molten iron component inspection, steel pressing production rhythm control, L245 narrow component control, full-process N content detection increased by converter continuous casting, converter smelting process control, optimization of high drawing speed stability of each section blank of continuous casting, optimization of continuous casting pouring process control and addition of a casting blank corner acid quality detection link. According to the invention, by detecting the N content in molten steel and the acid corrosion of a casting blank in the production process, the average N content of a product in the production process is controlled to be 32ppm, the average N content of a finished product is 48ppm, the N content is reduced by 10-20 ppm compared with the prior art, and the inclusion content of the total product is reduced by 0.5-1.5 grade compared with the prior art; and the hemming cracks of the pipeline steel are effectively controlled, the off-line rate of the casting blank defects is reduced from 5% to below 2%, the product qualification rate is improved to above 99%, a foundation is laid for stable and subsequent high-quality variety steel production, and the effect is obvious.
Description
Technical Field
The invention relates to the technical field of metallurgical steelmaking, in particular to a smelting and pouring process of L245 pipeline steel.
Background
With the development of modern engineering technology, the requirements on the strength, toughness, processability and the like of steel become stricter and stricter, and the requirements on the quality of steel are higher and higher. Existing TiO and Al2O3Single detection measure in the inclusion process, TiO and Al2O3The inclusion exists in the steel as an independent phase, which destroys the basic continuity of the pipeline steel and increases the inhomogeneity of the steel structure. Therefore, the presence of inclusions in the steel strongly affects the service properties of the steel. The influence on the steel performance is different according to different factors such as the property, the form, the distribution, the size, the content and the like of the inclusions.
TiO、Al2O3The inclusions are key factors of continuous casting trepanning and influence on the quality and physical properties of the L245 steel, edge cracks appear on a coil in the rolling process of the pipeline steel L245 steel, transverse microcracks easily appear on corners in the production of a plate blank, the length of the cracks is about 10mm, the corners of a casting blank crack at a fragile part, the cracks of the corners continue to extend and crack after rolling, the product percent of pass is only below 80%, the single item of product inclusions reaches 3 grades, and the quality of the final product is unstable.
Disclosure of Invention
In order to solve the technical problems, the invention provides a smelting and pouring process of L245 pipeline steel, and the quality of products is improved.
In order to realize the technical purpose, the invention adopts the following scheme: the smelting and pouring process of the L245 pipeline steel comprises the following steps:
step one, detecting the temperature of raw material molten iron and the sulfur content in the molten iron: the temperature of the molten iron is more than 1250 ℃, the sulfur content in the molten iron is less than 0.025 percent, and the molten iron is a qualified raw material;
step two, checking and verifying the equipment precision: checking the precision of equipment such as a casting machine roll gap, a crystallizer and a straight arc section centering, a crystallizer deflection and the like, checking the water leakage of a fan-shaped section and checking the running of a roller;
step three, smelting in a converter: 0.4kg of V iron, 0.6kg of Ti iron and 2.5m of aluminum wire are added into each ton of steel in each furnace;
step four, tapping: tapping after the temperature of molten steel reaches 1620 ℃, enabling the steel slag not to be sticky, adding refining slag at the bottom of a steel ladle before tapping, wherein the dosage of the refining slag is 3.6kg per ton of steel; when the molten steel is discharged to one fifth of the height of the steel ladle, adding aluminum, manganese and titanium and refining slag into the steel ladle, wherein the dosage of the aluminum, manganese and titanium is 0.36kg of the aluminum, manganese and titanium added into each ton of steel, the dosage of the refining slag is 0.9kg of the refining slag added into each ton of steel, and argon is blown in the whole process;
feeding aluminum wires for 2.5m per ton of steel by molten steel arriving at a station of the converter, adding Ti iron after feeding wires for 4min per ton of steel arriving at the station of the converter, wherein the dosage of Ti iron is 0.6kg of Ti iron added per ton of steel, and prolonging the total argon blowing time from 12min to 15min after the converter arrives at the station;
step six, continuous casting and pouring:
1) sleeving the large ladle sleeve in time after the startup heat exchange is normal, and stabilizing the temperature of the tundish at 1535-1545 ℃;
2) ensuring that the tundish is poured at the full liquid level, ensuring that the thickness of tundish slag is less than or equal to 40mm, and adding a heat preservation agent into the tundish in time after slag is discharged;
3) each furnace is sleeved with a large ladle long nozzle, argon is introduced into the large ladle long nozzle through an aluminum steel and asbestos pad, the nozzle is vertically inserted below the liquid steel surface, and the time from the stop of casting to the start of casting is controlled within 2min, so that the liquid level of tundish steel is not exposed, and the oxidation degree is reduced;
4) the liquid level of the crystallizer adopts an automatic control device, the fluctuation range of the liquid level is controlled within +/-3 mm, and the invasive water gap is centered;
5) adjusting the argon gas amount, not turning over around a water gap, filling a water gap punching rod for 2-3 times after the water gap is changed, cutting off the punching rod and the water gap, and measuring the insertion depth in time after the water gap is offline according to the cutting length of a fixed length less than 800mm and the insertion depth of the water gap of 100-135 mm;
seventhly, detecting the content of N in the production process: respectively sampling and detecting the N content after the molten steel of the converter arrives at the station, before the molten steel is carried out on the steel, and after the continuous casting requires that a large ladle is cast for 15 min;
eighthly, carrying out acid corrosion detection on the corner of the casting blank in the continuous casting process: N1N2 flows into 1 casting blank from each line, and corner samples with the length of 20cm are respectively taken from the inner arc and the outer arc of the casting blank for acid etching detection.
Compared with the prior art, the invention has the beneficial effects that: according to the invention, by detecting the N content in molten steel and the acid corrosion of a casting blank in the production process, the average N content of a product in the production process is controlled to be 32ppm, the average N content of a finished product is 48ppm, the N content is reduced by 10-20 ppm compared with the prior art, and the inclusion content of the total product is reduced by 0.5-1.5 grade compared with the prior art; and the hemming cracks of the pipeline steel are effectively controlled, the off-line rate of the casting blank defects is reduced from 5% to below 2%, the product qualification rate is improved to above 99%, a foundation is laid for stable and subsequent high-quality variety steel production, and the effect is obvious.
The preferred scheme of the invention is as follows:
before tapping, a slag stopper is added at the tapping hole to ensure that the tapping time is more than or equal to 2.5 min.
And (4) hanging each furnace sleeve at the ladle long nozzle, and cleaning up the residual steel at the bowl opening of the ladle sleeve.
And the nozzle with the exposed holes and serious erosion is replaced in time.
The water storage port can be changed in time.
Normal casting is focused on forbidding the rod punching.
Q235B before L245 smelting is controlled by the steel pressing production rhythm, so that L245 high-drawing-speed production is ensured.
The section drawing speed of 180 multiplied by 855 is stabilized at 1.0m/min, the section drawing speed of 180 multiplied by 810 is stabilized at 1.1m/min, the section drawing speed of 180 multiplied by 750 is stabilized at 1.2m/min, the section drawing speed of 180 multiplied by 685 is stabilized at 1.3m/min, and the drawing speed of other sections is controlled maximally according to the production rhythm.
Detailed Description
The present invention will be described in detail with reference to the following embodiments in order to fully understand the objects, features and effects of the invention, but the present invention is not limited thereto.
The invention provides a smelting and pouring process of L245 pipeline steel, which comprises the following steps:
step one, understanding the sequential production condition of each blast furnace in detail before smelting, rechecking the iron components coming from the blast furnace in time, and rechecking sample wafers or sample blocks of each furnace for one-to-one furnace comparison. Detecting the temperature of the raw material molten iron and the sulfur content in the molten iron: the temperature of the molten iron is more than 1250 ℃, and the sulfur content in the molten iron is less than 0.025 percent, which is a qualified raw material.
Step two, checking and verifying the equipment precision: before smelting, equipment precision such as a casting machine roll gap, a crystallizer and straight arc section alignment, crystallizer deflection and the like are checked, the water leakage of a fan-shaped section and the running condition of a roller are checked, and the influence of the water pumping condition on uniform cooling of a casting blank is reduced.
Step three, smelting in a converter: the components of the steel grades, particularly the AlS and Ti values are strictly controlled. 0.4kg of V iron, 0.6kg of Ti iron and 2.5m of aluminum wire are added into each ton of steel in each converter, and the smelting time and the smelting temperature of molten steel in the converter are determined according to different converter tonnages. For example, a 55 ton converter, the smelting time is 15min, and the smelting temperature is 1620 ℃. Step four, tapping: before tapping, a slag stopper is arranged at the tapping hole, the tapping hole is maintained in advance, the tapping time is guaranteed to be more than or equal to 2.5min, and the slag rolling phenomenon caused by the irregular tapping hole is avoided.
Tapping after the temperature of molten steel reaches 1620 ℃, enabling the steel slag not to be sticky, adding refining slag at the bottom of a steel ladle before tapping, wherein the dosage of the refining slag is 3.6kg per ton of steel; when the molten steel is discharged to one fifth of the height of the steel ladle, adding aluminum, manganese and titanium and refining slag, wherein the dosage of the aluminum, manganese and titanium is 0.36kg of the aluminum, manganese and titanium added to each ton of steel, the dosage of the refining slag is 0.9kg of the refining slag added to each ton of steel, and the refining slag is a purchased product. And (4) tapping steel, pouring steel, and blowing argon in the process that the steel ladle is placed into a tundish, and the tundish is placed into a crystallizer.
And fifthly, ensuring arrival molten steel by the converter, feeding aluminum wires for 2.5m per ton of steel, adding Ti iron after feeding wires for 4min per ton of steel, wherein the dosage of Ti iron is 0.6kg of Ti iron per ton of steel, and prolonging the total argon blowing time from 12min to 15min after the converter.
Step six, continuous casting and pouring:
1) and (3) sleeving the large ladle sleeve in time after the start-up heat exchange is normal, stabilizing the temperature of the middle ladle at 1535-1545 ℃, and performing furnace test on the equipment by using the first three-furnace smelting Q235B, so that the precision of the equipment and the raw materials is improved, and the product quality of the L245 is ensured. Meanwhile, Q235B is controlled by the steel pressing production rhythm, so that the L245 high-pulling-speed production is ensured.
2) Ensuring that the tundish is poured at the full liquid level, ensuring that the thickness of tundish slag is less than or equal to 40mm, and adding a heat preservation agent into the tundish in time after slag is discharged.
3) And (4) hanging each furnace sleeve at the ladle long nozzle, and cleaning up the residual steel at the bowl opening of the ladle sleeve. And the large aluminum steel product needs to be filled with asbestos pads to be filled with argon, so that the product is prevented from being oxidized. The nozzle is vertically inserted below the molten steel surface, and the nozzle with serious exposure and erosion is replaced in time. The time from the stop of casting to the start of casting is controlled within 2min, the liquid level of the tundish steel is ensured not to be exposed, and the oxidation degree is reduced.
4) The liquid level of the crystallizer is controlled by an automatic control device, the fluctuation range of the liquid level is controlled within +/-3 mm, and the invasive water gap is centered.
5) Adjusting the argon gas amount, not turning over around the water gap, filling the water gap changing punch rod for 2-3 times after the water gap is changed, cutting off the punch rod and the water gap, cutting off the part containing impurities according to the fixed length cutting length less than 800mm, and preventing the molten steel components from being polluted. The water gap insertion depth is 100-135 mm, the insertion depth is measured in time after the water gap is offline, the water gap is changed in time at the water storage port, and the normal pouring is heavily forbidden to punch the rod.
The molten steel passes through a crystallizer, a fan-shaped section and a casting blank to obtain a casting blank product of the L245 pipeline steel.
Detecting the content of N in the production process: after the converter molten steel arrives at the station, before the molten steel moves to the steel, and after the continuous casting requires that a large ladle is cast for 15min, sampling is respectively carried out to detect the N content. The N content in the product is less than 60ppm, and the product quality is qualified; the content of N is more than or equal to 60ppm, which indicates that the protective pouring has problems, and the smelting pouring process flow is reexamined and adjusted according to the sampling position.
Carrying out acid etching detection on the corner of the casting blank in the continuous casting process: and (3) respectively discharging 1 casting blank from each line by N1N2, respectively taking corner samples with the length of 20cm from the inner arc and the outer arc of the casting blank, and performing acid etching detection, wherein the defects of the pipeline steel after acid etching are displayed, and the product is qualified when the detection is less than 0.5 grade under a low power lens.
Q235B before L245 smelting is controlled by the steel pressing production rhythm, so that L245 high-drawing-speed production is ensured.
The section drawing speed of 180 multiplied by 855 is stabilized at 1.0m/min, the section drawing speed of 180 multiplied by 810 is stabilized at 1.1m/min, the section drawing speed of 180 multiplied by 750 is stabilized at 1.2m/min, the section drawing speed of 180 multiplied by 685 is stabilized at 1.3m/min, and the drawing speed of other sections is controlled maximally according to the production rhythm. For example, the pulling rate of a 180X 900 section is 1-1.3 m/min, and then the pulling rate is controlled according to 1.3 m/min.
The product composition of the L245 pipeline steel is shown in Table 1, and the composition of the L245 pipeline steel produced by the method of the present invention is superior to the standard product composition.
TABLE 1 product composition Table of L245 pipeline steel
| Steel grade | C | Si | Mn | P | S | Ti | V | AlS |
| Standard of merit | 0.09~0.14 | 0.20~0.35 | 0.8~1.00 | ≤0.03 | ≤0.03 | 0.008~0.02 | 0.015~0.025 | 0.015~0.060 |
| Internal control | 0.10~0.13 | 0.2~30 | 0.85~0.95 | 0.025 | 0.025 | 0.010~0.015 | 0.015~0.020 | 0.020 |
According to the invention, by detecting the N content in molten steel and the acid corrosion of a casting blank in the production process, the average N content of a product in the production process is controlled to be 32ppm, the average N content of a finished product is 48ppm, the N content is reduced by 10-20 ppm compared with the prior art, and the inclusion content of the total product is reduced by 0.5-1.5 grade compared with the prior art; and the hemming cracks of the pipeline steel are effectively controlled, the off-line rate of the casting blank defects is reduced from 5% to below 2%, the product qualification rate is improved to above 99%, a foundation is laid for stable and subsequent high-quality variety steel production, and the effect is obvious. The production process is simple to control, easy to operate and high in adaptability, and the improvement effect is obvious.
Finally, it is noted that: the above-mentioned list is only the preferred embodiment of the present invention, and naturally those skilled in the art can make modifications and variations to the present invention, which should be considered as the protection scope of the present invention provided they are within the scope of the claims of the present invention and their equivalents.
Claims (8)
1. A smelting and pouring process of L245 pipeline steel is characterized by comprising the following steps:
step one, detecting the temperature of raw material molten iron and the sulfur content in the molten iron: the temperature of the molten iron is more than 1250 ℃, the sulfur content in the molten iron is less than 0.025 percent, and the molten iron is a qualified raw material;
step two, checking and verifying the equipment precision: checking the precision of equipment such as a casting machine roll gap, a crystallizer and a straight arc section centering, a crystallizer deflection and the like, checking the water leakage of a fan-shaped section and checking the running of a roller;
step three, smelting in a converter: 0.4kg of V iron, 0.6kg of Ti iron and 2.5m of aluminum wire are added into each ton of steel in each furnace;
step four, tapping: tapping after the temperature of molten steel reaches 1620 ℃, enabling the steel slag not to be sticky, adding refining slag at the bottom of a steel ladle before tapping, wherein the dosage of the refining slag is 3.6kg per ton of steel; when the molten steel is discharged to one fifth of the height of the steel ladle, adding aluminum, manganese and titanium and refining slag into the steel ladle, wherein the dosage of the aluminum, manganese and titanium is 0.36kg of the aluminum, manganese and titanium added into each ton of steel, the dosage of the refining slag is 0.9kg of the refining slag added into each ton of steel, and argon is blown in the whole process;
feeding aluminum wires for 2.5m per ton of steel by molten steel arriving at a station of the converter, adding Ti iron after feeding wires for 4min per ton of steel arriving at the station of the converter, wherein the dosage of Ti iron is 0.6kg of Ti iron added per ton of steel, and prolonging the total argon blowing time from 12min to 15min after the converter arrives at the station;
step six, continuous casting and pouring:
1) sleeving the large ladle sleeve in time after the startup heat exchange is normal, and stabilizing the temperature of the tundish at 1535-1545 ℃;
2) ensuring that the tundish is poured at the full liquid level, ensuring that the thickness of tundish slag is less than or equal to 40mm, and adding a heat preservation agent into the tundish in time after slag is discharged;
3) each furnace is sleeved with a large ladle long nozzle, argon is introduced into the large ladle long nozzle through an aluminum steel and asbestos pad, the nozzle is vertically inserted below the liquid steel surface, and the time from the stop of casting to the start of casting is controlled within 2min, so that the liquid level of tundish steel is not exposed, and the oxidation degree is reduced;
4) the liquid level of the crystallizer adopts an automatic control device, the fluctuation range of the liquid level is controlled within +/-3 mm, and the invasive water gap is centered;
5) adjusting the argon gas amount, slightly turning the periphery of a water gap, punching a rod 2-3 times after the water gap is changed by a water gap changing punching rod, cutting off the punching rod and the water gap changing position, and measuring the insertion depth in time after the water gap is offline according to the cutting length of a fixed length of less than 800mm and the insertion depth of the water gap of 100-135 mm;
seventhly, detecting the content of N in the production process: respectively sampling and detecting the N content after the molten steel of the converter arrives at the station, before the molten steel is carried out on the steel, and after the continuous casting requires that a large ladle is cast for 15 min;
eighthly, carrying out acid corrosion detection on the corner of the casting blank in the continuous casting process: N1N2 flows into 1 casting blank from each line, and corner samples with the length of 20cm are respectively taken from the inner arc and the outer arc of the casting blank for acid etching detection.
2. The smelting and pouring process of the L245 pipeline steel as claimed in claim 1, wherein a slag stopper is added at a steel tapping hole before steel tapping, and the steel tapping time is guaranteed to be more than or equal to 2.5 min.
3. The smelting and pouring process of the L245 pipeline steel according to claim 1, wherein the ladle sleeve pipe bowl mouth residual steel is cleaned up for each furnace sleeve hanger of the ladle long nozzle.
4. The process for smelting and pouring the L245 pipeline steel according to claim 1, wherein a nozzle with a naked eye and severe erosion is replaced in time.
5. The process for smelting and pouring the L245 pipeline steel according to claim 1, wherein a water storage port is replaced with a water opening in time.
6. The process of claim 1, wherein the normal casting is performed with strict bar punching prohibited.
7. The process for smelting and pouring the L245 pipeline steel as claimed in claim 1, wherein the test furnace is carried out by using Q235B before smelting the L245, and the Q235B is controlled by adopting the steel pressing production rhythm to ensure the high-pulling-speed production of the L245.
8. The process for smelting and pouring the L245 pipeline steel as claimed in claim 1, wherein the section pull rate of 180 x 855 is stabilized at 1.0m/min, the section pull rate of 180 x 810 is stabilized at 1.1m/min, the section pull rate of 180 x 750 is stabilized at 1.2m/min, the section pull rate of 180 x 685 is stabilized at 1.3m/min, and the maximum pull rate of other sections is controlled according to the production rhythm.
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