CN111270137A - Acid corrosion resistant pipeline steel X52MS hot-rolled coil and preparation method thereof - Google Patents
Acid corrosion resistant pipeline steel X52MS hot-rolled coil and preparation method 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
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
- C21D8/0263—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment following hot rolling
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- C—CHEMISTRY; METALLURGY
- 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
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- 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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/24—Ferrous alloys, e.g. steel alloys containing chromium with vanadium
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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
- C22C38/26—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
- C22C38/28—Ferrous alloys, e.g. steel alloys containing chromium with titanium or zirconium
Abstract
The invention belongs to the technical field of ferrous metallurgy, and relates to an acid corrosion resistant pipeline steel X52MS hot-rolled coil which comprises the following components in percentage by weight: 0.03-0.10% of C, 0.45-0.80% of Mn, 0.10-0.30% of Si, 0.010-0.050% of Al, 0.25-0.40% of Cr, 0.015-0.035% of Ti, less than or equal to 0.012% of P, less than or equal to 0.0050% of S, less than or equal to 0.0060% of N, less than or equal to 0.0040% of O, 0.030-0.065% of Nb, 0.015-0.045% of V, and the balance of Fe and inevitable impurities. The invention also discloses a preparation method of the X52MS hot-rolled coil, which greatly improves the production efficiency of the pipeline steel, reduces the energy consumption and the production cost, prolongs the service life and is beneficial to meeting the requirements of social development.
Description
Technical Field
The invention belongs to the technical field of ferrous metallurgy, and relates to an acid corrosion resistant pipeline steel X52MS hot-rolled coil and a preparation method thereof.
Background
The acid corrosion resistant pipeline steel is mainly used for manufacturing pipelines for conveying acid natural gas, and is the steel for petroleum and natural gas with the largest production difficulty. The steel has very strict requirements on the levels of component design, smelting technology, rolling technology and metallurgical equipment, so that the production of the acid-resistant pipeline steel represents the highest level of the pipeline steel production of a steel mill in one country. Due to high service risk and high production difficulty of the acid corrosion resistant pipeline steel, only a few steel enterprises in the world, such as European steel pipes, Germany Dilin root, Japanese New day iron, JFE and the like, can stably produce the acid corrosion resistant pipeline steel in batches, and domestic key steel mills carry out industrial trial production and batch production of the acid corrosion resistant pipeline steel. In addition, the existing acid corrosion resistant X52MS pipeline steel has the defects of high preparation cost, complex process and the like in the manufacturing process. There is an urgent need for optimizing development of novel acid corrosion resistant X52MS pipeline steel, improving quality of pipeline steel and optimizing preparation method of pipeline steel.
Accordingly, those skilled in the art have been devoted to developing an acid corrosion resistant X52MS pipeline steel and a method of making the same.
Disclosure of Invention
In view of the defects of the prior art, the technical problems to be solved by the invention are that the purity of molten steel and the internal quality of a casting blank are low in the preparation process of the X52MS pipeline steel, the alloy composition of the pipeline steel is unreasonable in design, the content of harmful elements such as sulfur, phosphorus and gas is high, and the content of non-metallic inclusions in the steel cannot be controlled.
The purpose of the invention can be realized by the following technical scheme:
the invention provides an acid corrosion resistant pipeline steel X52MS hot-rolled coil, which comprises the following components in percentage by weight: 0.03-0.10% of C, 0.45-0.80% of Mn, 0.10-0.30% of Si, 0.010-0.050% of Al, 0.25-0.40% of Cr, 0.015-0.035% of Ti, less than or equal to 0.012% of P, less than or equal to 0.0050% of S, less than or equal to 0.0060% of N, less than or equal to 0.0040% of O, 0.030-0.065% of Nb, 0.015-0.045% of V, and the balance of Fe and inevitable impurities.
The invention provides a preparation method of the acid corrosion resistant pipeline steel X52MS hot-rolled coil, which comprises the steps of carrying out calcification after refining treatment, properly increasing soft blowing time and strictly controlling inclusions in molten steel; the whole process adopts protective pouring. A heating system: ensuring that the tapping temperature of the plate blank is more than or equal to 1180 ℃; a finish rolling outlet temperature target of 820 ℃; the coiling temperature target is 550 ℃.
Further, the method comprises the following process flows: molten iron pretreatment → converter smelting → external refining → continuous casting → (2300 hot rolling) heating → rough rolling, finish rolling → controlled cooling → coiling.
Further, the S in the molten iron pretreatment is less than or equal to 0.005 percent.
Furthermore, in the smelting process of the converter, the content of Als in the steel ladle is controlled according to 0.005-0.015 percent; the N content of the steel ladle is required to be less than or equal to 30 ppm.
Further, in the external refining step, the amount of N added is less than or equal to 10 ppm.
Furthermore, in the continuous casting process, the water mouth is controlled to absorb N, and the increase of N is controlled to be less than or equal to 5 ppm; high-alkalinity tundish slag is adopted, and the tundish is controlled according to the superheat degree of less than or equal to 25 ℃.
The invention has the beneficial effects that:
the acid corrosion resistant pipeline steel X52MS hot rolled coil adopts the design of low carbon, extremely low phosphorus, ultra low sulfur and micro alloying, and matches with pure steel technology and controlled rolling and controlled cooling process, and the mechanical property and various indexes of HIC and SSCC corrosion resistance meet the requirements. The acid-resistant pipeline steel X52MS is used for producing and manufacturing the pipeline for conveying the acid natural gas, so that the service life of the pipeline can be greatly prolonged, the steel loss caused by corrosion is reduced, and huge social and economic benefits can be brought.
Detailed Description
Aiming at the following technical problems in the prior art: the invention improves the purity of the molten steel and the internal quality of the casting blank, and the acid corrosion resistant pipeline steel is the steel with the highest performance requirement grade and the highest production difficulty in the steel for petroleum and natural gas, has extremely high control requirements on the cleanliness of the molten steel and the center segregation of the casting blank, and is close to the limit control in the aspect of controlling the sulfur content, so the development of the acid corrosion resistant pipeline steel has very strict requirements on the production process, particularly the steelmaking process.
The alloy design of the acid corrosion resistant pipeline steel X52MS adopts the main design ideas of low carbon, extremely low phosphorus, ultra low sulfur and micro-alloying on the chemical composition design of the acid corrosion resistant pipeline steel, and is matched with a pure steel technology and a controlled rolling and controlled cooling process; the key points in production are that the contents of harmful elements such as sulfur, phosphorus and gas in steel are reduced as much as possible, the content of non-metallic inclusions in the steel is reduced, MnS inclusions which are particularly harmful to the HIC resistance of the steel are particularly reduced, the inclusions are subjected to denaturation treatment, sulfides are finely and dispersedly distributed, and the structure is uniformly refined and compact.
In order to obtain excellent H2S corrosion resistance, the acid-resistant pipeline steel X52MS has to have good purity and reasonable microalloying design of molten steel, and reduce the segregation and inclusion of the molten steel in the solidification process.
The invention comprises the following steps: the core requirements of the alloy components are as follows: comprises the following components in percentage by weight: 0.03-0.10% of C, 0.45-0.80% of Mn0.10-0.30% of Si, 0.010-0.050% of Al, 0.25-0.40% of Cr, 0.015-0.035% of Ti0.015% of Ti, less than or equal to 0.012% of P, less than or equal to 0.0050% of S, less than or equal to 0.0060% of N, less than or equal to 0.0040% of O, 0.030-0.065% of Nb0.015-0.045% of V, and the balance of Fe and inevitable impurities.
Wherein the main design concept of low carbon, ultra-low phosphorus, ultra-low sulfur and microalloying is adopted, C: carbon is a stable austenite element, the HIC resistance of the pipeline steel is increased along with the increase of the carbon content, and the increase of the carbon content and the carbon equivalent can cause the steel to generate a martensite structure which is most sensitive to hydrogen induced bubbling when the steel is hot rolled. Therefore, reducing the carbon content and carbon equivalent can improve the HIC resistance of the pipeline steel. Mn: the addition of a proper amount of manganese into the pipeline steel can improve the hardenability of the steel and make up for the strength reduction caused by low carbon. Manganese combines with sulfur to form MnS which lowers the brittle transition temperature of the steel, while segregation of manganese and phosphorus causes the formation of bands sensitive to HIC, and thus increasing the manganese content causes more bands to be formed, thereby increasing the HIC resistance of the pipeline steel. Nb, V: the addition of micro alloy elements such as niobium, vanadium, titanium and the like into the pipeline steel can effectively prevent austenite grains from growing large, refine grains and enhance the HIC resistance of the pipeline steel.
The low carbon, ultra-low phosphorus, ultra-low sulfur and microalloying design is adopted to reduce segregation in steel and improve the weldability of the steel. The low O and the low S are controlled, so that inclusions in steel can be reduced, and the toughness and the plasticity are improved.
The specific scheme of the acid corrosion resistant pipeline steel X52MS is as follows:
carrying out calcification after refining treatment, properly increasing soft blowing time, and strictly controlling inclusions in molten steel; the whole process adopts protective pouring. A heating system: ensuring that the tapping temperature of the plate blank is more than or equal to 1180 ℃; a finish rolling outlet temperature target of 820 ℃; the coiling temperature target is 550 ℃.
Example 1:
an acid corrosion resistant pipeline steel X52MS hot rolled coil comprises the following components in percentage by weight: 0.033% of C, 0.74% of Mn0.74%, 0.15% of Si, 0.031% of Al, 0.32% of Cr, 0.015% of Ti, 0.008% of P, 0.0008% of S, 0.0050% of N, 0.0019% of O, 0.044% of Nb, 0.016% of V, and the balance of Fe and inevitable impurities.
A preparation method of an acid corrosion resistant pipeline steel X52MS hot-rolled coil comprises the following process procedures: molten iron pretreatment → converter smelting → external refining → continuous casting → (2300 hot rolling) heating → rough rolling, finish rolling → controlled cooling → coiling → finished product inspection → delivery.
First, steel making
1. Raw Material Process
The pretreatment furnace S is 0.002%, and the slag is removed; fine scrap steel is adopted.
2. Ladle procedure
Requiring the red tank to be steel-bearing; ensuring the air permeability and the self-casting property of the steel ladle; cleaning a steel ladle without residual steel and residue; ladle usage is considered for calcium feeding.
3. Converter procedure
The converter draws carbon for one time, and avoids point blowing; the steel tapping adopts low-carbon low-phosphorus ferromanganese, ferrosilicon, ferromolybdenum and high-chromium alloying; argon purging is carried out on a steel ladle before tapping, a tapping hole is controlled, and free flow is avoided, wherein Als of the steel ladle is 0.012%; the steel ladle N is required to be 23ppm, slag is blocked and steel is tapped, and the amount of slag entering the steel ladle is strictly controlled.
4. Refining procedure
The LF treatment process is required to keep micro-positive pressure, the increase of N in LF is strictly controlled, and the increase of N is required to be 5 ppm; the LF adopts active lime and fluorite to produce reducing slag with good fluidity, and strictly controls argon blowing intensity to avoid the liquid steel from being naked as much as possible; dew; performing calcium treatment after RH treatment, increasing soft blowing time, and strictly controlling inclusions in molten steel; and (4) taking gas samples before and after refining for N, O content analysis.
5. Continuous casting procedure
Protective casting is performed all the way, and a gas sample is taken for analysis N, O. Argon is adopted to purge the tundish before casting, no molten steel is exposed in the casting process, the water mouth is strictly controlled to suck N, and the increase of N is controlled to be 3 ppm; high-alkalinity slag inclusion is adopted to facilitate the removal of inclusions in steel; the soft reduction function is put into the steel casting process; the constant drawing speed is kept in the steel casting process; the temperature of the middle package is controlled according to the degree of superheat of 19 ℃.
Second, hot rolling
1. Slab and heating zone
The tapping temperature of the slab is 1185 ℃. The furnace atmosphere of the heating furnace is controlled, the generation of the casting blank iron scale is reduced, and the uniform heating temperature is ensured.
2. Rough rolling, finish rolling, coiling area
Load distribution of a finish rolling model is well done, and rolling stability is guaranteed; a finish rolling outlet temperature target of 820 ℃; the coiling temperature target is 550 ℃. Cooling mode the front stage continuous cooling mode. And the accurate control of the final rolling and coiling temperature is ensured.
In order to ensure the HIC and SSC corrosion resistance of the acid corrosion resistant pipeline steel X52MS in the using process, HIC and SSC resistance tests are carried out. HIC test solution A, B was used for testing, NACETM0284-2011, and the results are shown in the following table:
anti-SSC test a solution test was performed using NACE TM0177-1996 standard using a four point bend test specimen according to ASTM G39 for a test time of 720 hours and a test loading stress: the tensile surface of the test specimen was examined at 10 times lower magnification microscope with 72% SMYS (specified minimum yield strength) of 72% by 360MPa of 259.2MPa, and the results are shown in the table.
Example 2:
an acid corrosion resistant pipeline steel X52MS hot rolled coil comprises the following components in percentage by weight: 0.10% of C, 0.80% of Mn0.80%, 0.30% of Si, 0.050% of Al, 0.32% of Cr, 0.035% of Ti, 0.005% of P, 0.0010% of S, 0.0040% of N, 0.0029% of O, 0.065% of Nb, 0.045% of V, and the balance of Fe and inevitable impurities.
The process is the same as that of example 1, in this example, the pretreatment charging S in the raw material process is 0.001%,
in the converter procedure, the content of Als in the steel ladle is 0.010 percent; the N content of the steel ladle is required to be 25ppm, slag is blocked, steel is tapped, and the amount of slag entering the steel ladle is strictly controlled.
4. Refining procedure
The LF treatment process is required to keep micro-positive pressure, the increase of N in LF is strictly controlled, and the increase of N is required to be 6 ppm; the LF adopts active lime and fluorite to produce reducing slag with good fluidity, and strictly controls argon blowing intensity to avoid the liquid steel from being naked as much as possible; dew; performing calcium treatment after RH treatment, increasing soft blowing time, and strictly controlling inclusions in molten steel; and (4) taking gas samples before and after refining for N, O content analysis.
5. Continuous casting procedure
Protective casting is performed all the way, and a gas sample is taken for analysis N, O. Argon is adopted to purge the tundish before casting, no molten steel is exposed in the casting process, the water mouth is strictly controlled to suck N, and the increase of N is controlled to be 4 ppm; high-alkalinity slag inclusion is adopted to facilitate the removal of inclusions in steel; the soft reduction function is put into the steel casting process; the constant drawing speed is kept in the steel casting process; the superheat degree of the tundish is 25 ℃.
Second, hot rolling
1. Slab and heating zone
The discharging temperature of the plate blank is 1190 ℃. The furnace atmosphere of the heating furnace is controlled, the generation of the casting blank iron scale is reduced, and the uniform heating temperature is ensured.
2. Rough rolling, finish rolling, coiling area
Load distribution of a finish rolling model is well done, and rolling stability is guaranteed; a finish rolling outlet temperature target of 820 ℃; the coiling temperature target is 550 ℃. Cooling mode the front stage continuous cooling mode. And the accurate control of the final rolling and coiling temperature is ensured.
Example 3
An acid corrosion resistant pipeline steel X52MS hot rolled coil comprises the following components in percentage by weight: 0.08 percent of C, 0.60 percent of Mn0.20 percent of Si, 0.030 percent of Al, 0.28 percent of Cr, 0.030 percent of Ti, 0.002 percent of P, 0.0030 percent of S, 0.0030 percent of N, 0.0019 percent of O, 0.045 percent of Nb, 0.025 percent of V, and the balance of Fe and inevitable impurities.
The process is the same as that of example 1, in this example, the amount of S fed into the furnace in the pretreatment in the raw material process is 0.002%,
in the converter procedure, the content of Als in the steel ladle is 0.010 percent; the N content of the steel ladle is required to be 28ppm, slag is blocked, steel is tapped, and the amount of slag entering the steel ladle is strictly controlled.
4. Refining procedure
The LF treatment process is required to keep micro-positive pressure, the increase of N in LF is strictly controlled, and the increase of N is required to be 8 ppm; the LF adopts active lime and fluorite to produce reducing slag with good fluidity, and strictly controls argon blowing intensity to avoid the liquid steel from being naked as much as possible; dew; performing calcium treatment after RH treatment, increasing soft blowing time, and strictly controlling inclusions in molten steel; and (4) taking gas samples before and after refining for N, O content analysis.
5. Continuous casting procedure
Protective casting is performed all the way, and a gas sample is taken for analysis N, O. Argon is adopted to purge the tundish before casting, no molten steel is exposed in the casting process, the water mouth is strictly controlled to suck N, and the increase of N is controlled to be 2 ppm; high-alkalinity slag inclusion is adopted to facilitate the removal of inclusions in steel; the soft reduction function is put into the steel casting process; the constant drawing speed is kept in the steel casting process; the superheat degree of the tundish is 18 ℃.
Second, hot rolling
1. Slab and heating zone
The discharging temperature of the plate blank is 1195 ℃. The furnace atmosphere of the heating furnace is controlled, the generation of the casting blank iron scale is reduced, and the uniform heating temperature is ensured.
2. Rough rolling, finish rolling, coiling area
Load distribution of a finish rolling model is well done, and rolling stability is guaranteed; a finish rolling outlet temperature target of 820 ℃; the coiling temperature target is 550 ℃. Cooling mode the front stage continuous cooling mode. And the accurate control of the final rolling and coiling temperature is ensured.
The acid corrosion resistant pipeline steel X52MS produced by the process has various mechanical properties meeting the requirements, and has excellent HIC and SSCC corrosion resistance. The product has wide application and good economic benefit.
The preferred embodiments of the invention disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and their full scope and equivalents.
Claims (7)
1. An acid corrosion resistant pipeline steel X52MS hot rolled coil is characterized by comprising the following components in percentage by weight: 0.03-0.10% of C, 0.45-0.80% of Mn, 0.10-0.30% of Si, 0.010-0.050% of Al, 0.25-0.40% of Cr, 0.015-0.035% of Tis, less than or equal to 0.012% of P, less than or equal to 0.0050% of S, less than or equal to 0.0060% of N, less than or equal to 0.0040% of O, 0.030-0.065% of Nb, 0.015-0.045% of V, and the balance of Fe and inevitable impurities.
2. A preparation method of an acid corrosion resistant pipeline steel X52MS hot-rolled coil is characterized by comprising the steps of carrying out calcification after refining treatment, properly increasing soft blowing time and strictly controlling inclusions in molten steel; the whole process adopts protective pouring. A heating system: ensuring that the tapping temperature of the plate blank is more than or equal to 1180 ℃; a finish rolling outlet temperature target of 820 ℃; the coiling temperature target is 550 ℃.
3. The method for preparing the acid corrosion resistant pipeline steel X52MS hot-rolled sheet according to claim 2, comprising the following steps: molten iron pretreatment → converter smelting → external refining → continuous casting → (2300 hot rolling) heating → rough rolling, finish rolling → controlled cooling → coiling.
4. The method for preparing the acid corrosion resistant pipeline steel X52MS hot rolled coil according to claim 3, wherein S in the molten iron pretreatment is less than or equal to 0.005%.
5. The method for preparing the acid corrosion resistant pipeline steel X52MS hot rolled coil according to claim 3, wherein in the converter smelting process, the content of steel ladle Als is controlled to be 0.005-0.015%; the N content of the steel ladle is required to be less than or equal to 30 ppm.
6. The method for preparing the acid corrosion resistant pipeline steel X52MS hot-rolled sheet according to claim 3, wherein in the external refining process, the N increase is less than or equal to 10 ppm.
7. The method for preparing the acid corrosion resistant pipeline steel X52MS hot-rolled coil according to claim 3, wherein in the continuous casting process, the water mouth is controlled to absorb N, and the increase of N is controlled to be less than or equal to 5 ppm; high-alkalinity tundish slag is adopted, and the tundish is controlled according to the superheat degree of less than or equal to 25 ℃.
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| CN112695251A (en) * | 2020-12-21 | 2021-04-23 | 本钢板材股份有限公司 | Production method of thick seaside building structure steel S355G11M hot-rolled coil |
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