CN111172463A - Acid corrosion resistant BGNS440 steel hot-rolled coil and preparation method thereof - Google Patents
Acid corrosion resistant BGNS440 steel 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
- C21D8/0221—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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- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- 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
- C22C38/06—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
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
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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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
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- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/60—Ferrous alloys, e.g. steel alloys containing lead, selenium, tellurium, or antimony, or more than 0.04% by weight of sulfur
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Abstract
The invention belongs to the field of preparation of acid corrosion resistant hot rolled steel coils, and relates to an acid corrosion resistant BGNS440 hot rolled steel coil and a manufacturing method thereof. The paint consists of the following components in percentage by weight: 0.05 to 0.08 percent of C, 0.45 to 0.65 percent of Mn, 0.10 to 0.30 percent of Si, 0.010 to 0.050 percent of Al, 0.55 to 0.70 percent of Cr, 0.015 to 0.035 percent of Ti, 0.10 to 0.20 percent of Ni, less than or equal to 0.012 percent of P, less than or equal to 0.0080 percent of S, less than or equal to 0.0060 percent of N, less than or equal to 0.0030 percent of O, and the balance of Fe and inevitable impurities. The industrial structural member for producing corrosive environments such as heavy oil, fire coal and the like by using the acid corrosion resistant BGNS440 steel produced by the invention can greatly prolong the service life, reduce the steel loss caused by corrosion and bring huge social and economic benefits.
Description
Technical Field
The invention belongs to the field of preparation of acid corrosion resistant hot rolled steel coils, and relates to an acid corrosion resistant BGNS440 hot rolled steel coil and a manufacturing method thereof.
Background
The fuel such as heavy oil, coal and the like used in the industrial manufacturing process generally contains 2 to 3 percent of sulfur, and the flue gas after combustion contains about 0.2 percent of SO2And wherein 1% -2% of SO2Is oxidized to generate SO by the catalytic action of ash and metal oxide3，SO3And combines with the water produced by the combustion of the fuel to form sulfuric acid. When the ambient temperature drops below the dew point of the sulfuric acid in the flue gas, the sulfuric acid will condense on the metal surfaces and cause severe corrosion effects on the metal.
Since the dew point corrosion is required for the ambient temperature down to the dew point of sulfuric acid, the corrosion is mainly caused in the low temperature part of the boiler exhaust system, i.e., the gas temperature drop part such as an air preheater, an exhaust gas preheater, a coal economizer, a dust collector, and a flue. In addition, with the improvement of various boiler parameters, the increase of capacity and the use of a large amount of fuel with high sulfur content, the problem of corrosion of steel used at a low temperature end in a combustion atmosphere is more serious. The data show that the corrosion rate of the carbon steel in the environment can exceed 5mm/a, and the economic loss caused by the dew point of the sulfuric acid is difficult to estimate. The research and development and application of low-alloy acid corrosion resistant steel designed by adopting a small amount of multi-element alloying principle arouse wide attention at home and abroad.
Disclosure of Invention
The invention aims to provide an acid corrosion resistant BGNS440 steel hot-rolled coil and a manufacturing method thereof, which can improve the acid corrosion resistance of steel, improve the purity of molten steel through reasonable alloy component design, reduce tissue segregation and other measures, and greatly improve the acid corrosion resistance of BGNS 440.
The purpose of the invention can be realized by the following technical scheme:
the acid corrosion resistant BGNS440 steel hot-rolled coil comprises the following components in percentage by weight: 0.05 to 0.08 percent of C, 0.45 to 0.65 percent of Mn, 0.10 to 0.30 percent of Si, 0.010 to 0.050 percent of Al, 0.55 to 0.70 percent of Cr, 0.015 to 0.035 percent of Tis, 0.10 to 0.20 percent of Ni, less than or equal to 0.012 percent of P, less than or equal to 0.0080 percent of S, less than or equal to 0.0060 percent of N, less than or equal to 0.0030 percent of O, 0.040 to 0.200 percent of Sb, 0.25 to 0.50 percent of Cus, and the balance of Fe and inevitable impurities.
Further, the paint comprises the following components in percentage by weight: 0.063% of C, 0.58% of Mn, 0.19% of Si, 0.018% of Al, 0.58% of Cr, 0.018% of Ti, 0.148% of Ni, 0.0103% of P, 0.005% of S, 0.0050% of N, 0.0024% of O, 0.050% of Sb, 0.32% of Cu, and the balance of Fe and inevitable impurities.
A preparation method of an acid corrosion resistant BGNS440 steel hot rolled coil 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, carrying out calcification after refining treatment, increasing soft blowing time for 10 minutes, and controlling inclusions in molten steel, wherein A, B, C, D-type inclusions are required to be less than or equal to 2.0 level; the whole process adopts protective pouring.
Preferably, the heating schedule in the preparation method is: the tapping temperature of the plate blank is more than or equal to 1200 ℃; the outlet temperature of the finish rolling is 860 ℃; the coiling temperature target is 600 ℃.
Furthermore, in the working procedure of the converter, the content of Als in the steel ladle is controlled according to 0.005-0.015 percent, and the content of N is less than or equal to 30 ppm.
Furthermore, the N increasing amount in the refining procedure is less than or equal to 10 ppm; the quantity of N added in the continuous casting procedure is less than or equal to 5 ppm.
Furthermore, in the continuous casting process, the temperature of the tundish is controlled according to the superheat degree of less than or equal to 30 ℃.
The invention has the beneficial effects that:
(1) in the aspect of component design, the low-C and low-Mn design is adopted, and a small amount of Sb, Cu and Cr alloy elements are added, so that various indexes of mechanical property and acid corrosion resistance meet the requirements.
(2) The industrial structural member for producing corrosive environments such as heavy oil, fire coal and the like by using the acid corrosion resistant BGNS440 steel produced by the invention can greatly prolong the service life, reduce the steel loss caused by corrosion and bring huge social and economic benefits.
Detailed Description
The present invention is further illustrated by the following specific embodiments, but is not intended to limit the scope of the present invention.
In order to improve the acid corrosion resistance of steel, the method adopts reasonable alloy component design, improves the purity of molten steel, reduces tissue segregation and the like, and greatly improves the acid corrosion resistance of BGNS 440.
The low-cost alloy design of the acid corrosion resistant BGNS440 steel comprises the following steps: the existing other corrosion-resistant steels need to add a large amount of Cu, Cr and Ni elements to improve the corrosion resistance of the steel, and the acid corrosion resistant BGNS44O adopts the low-carbon micro Sb + Cu + Cr alloying component design by optimizing the component design and matching with a reasonable TMPC rolling process to finally obtain the acid corrosion resistant steel BGNS440 with the sulfuric acid dew point corrosion resistance and good welding performance, thereby saving a large amount of alloy cost.
In order to obtain excellent sulfuric acid corrosion resistance, the acid corrosion resistant BGNS440 steel must require good purity of molten steel and reasonable microalloying design, and simultaneously reduce segregation and inclusion of the molten steel in the solidification process.
The invention comprises the following steps: the core of the alloy composition is required to be 0.05-0.08 percent of C, 0.45-0.65 percent of Mn, 0.10-0.30 percent of Si, 0.010-0.050 percent of Al, 0.55-0.70 percent of Cr, 0.015-0.035 percent of Ti, 0.10-0.20 percent of Ni, less than or equal to 0.012 percent of P, less than or equal to 0.0080 percent of S, less than or equal to 0.0060 percent of N, less than or equal to 0.0030 percent of O, 0.040-0.200 percent of Sb, 0.25-0.50 percent of Cu0, and the balance of Fe and inevitable impurities.
The low-carbon micro Sb + Cu + Cr alloying component design is that Cu: can promote the surface of the steel to form Cu2S passivates the film, thereby suppressing electrochemical reactions of the anode and the cathode. Cr: chromium has a lower electrode potential and can make the steel have a tendency to passivate. The chromium and the copper can promote passivation under the condition of no active carbon, obviously reduce the corrosion rate, particularly obviously reduce the pitting corrosion rate, and further improve the sulfuric acid dew point corrosion resistance of the low alloy steel. Sb: antimony is an IVA-VIA group element, so that the sulfuric acid corrosion resistance of the steel can be effectively improved, and the antimony and copper can form a Cu2Sb protective film on the surface of the steel to inhibit a cathode reaction. The acid corrosion resistance of the steel can be improved.
By adopting the design of low C and low Mn, the segregation in the steel can be reduced, the carbon equivalent is reduced, and the weldability of the steel is improved. 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.
Example 1:
the acid corrosion resistant BGNS440 steel is required to obtain excellent sulfuric acid corrosion resistance, and the molten steel has good purity and reasonable microalloying design, and the segregation and inclusion of the molten steel in the solidification process are reduced.
The steel plate comprises the following specific components: 0.063% of C, 0.58% of Mn, 0.19% of Si, 0.018% of Al, 0.58% of Cr, 0.018% of Ti0.018% of Ni, 0.148% of P, 0.0103% of S, 0.0050% of N, 0.0024% of O, 0.050% of Sb, 0.32% of Cu0.32% and the balance of Fe and inevitable impurities.
The preparation method comprises the following steps: 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
Pretreating the furnace S less than or equal to 0.005 percent, and completely removing slag; 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, the flow scattering is avoided, and steel ladle Als is controlled according to 0.005-0.015%; the N of the steel ladle is required to be less than or equal to 30ppm, 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 less than or equal to 10 ppm; the LF adopts active lime and fluorite to produce reducing slag with good fluidity, so that the molten steel is prevented from being exposed as much as possible; performing calcium treatment after RH treatment, increasing soft blowing time by 10 minutes, and strictly controlling inclusions in the 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 less than or equal to 5 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 tundish is controlled according to the superheat degree which is less than or equal to 30 ℃.
Second, hot rolling
1. Slab and heating zone
The tapping temperature of the plate blank is more than or equal to 1200 ℃. 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; the outlet temperature of the finish rolling is 860 ℃; the coiling temperature target is 600 ℃. And the post-stage continuous cooling mode of the cooling mode ensures the accurate control of the finish rolling and coiling temperatures.
Comparative example 1
A Q235B steel plate and a production method for reducing the energy consumption of the Q235B steel plate. The steel plate comprises the following chemical components in percentage by weight: c: 0.17-0.19%; si: 0.18-0.28%; mn: 0.45-0.55%; p: less than or equal to 0.02 percent; s: less than or equal to 0.015 percent; and Als: 0.017-0.027%; ca: 0.001-0.0025%;
1) selecting a continuous casting billet with the thickness of 200 mm; 2) casting the slab, directly passing through a conveying roller way after cutting, and then entering a heating furnace for reheating, wherein the surface temperature of the slab is more than or equal to 650 ℃; 3) a heating process: discharging a continuous casting billet with the thickness of 200mm at the temperature of 1190-1210 ℃, and heating for 160-250 minutes; 4) the slab is heated and then rolled in a controlled manner, the initial rolling thickness of the first stage is the slab thickness, the initial rolling temperature of the first stage is 1180-1200 ℃, the rolling speed of the first stage is 2.0m/s, and the final rolling temperature of the first stage is more than 1060 ℃; the single-pass reduction rate is more than or equal to 15 percent during the first-stage high-temperature extension sequence rolling; the initial rolling thickness of the second-stage steel plate is 3.5 times of the thickness of the finished steel plate, the initial rolling temperature of the second-stage steel plate is 910-970 ℃, and the final rolling temperature of the second stage is 810-830 ℃; rolling for 5-6 times in the second stage, wherein the single-pass reduction rate is more than or equal to 10% in the second stage, and the rolling speed is 3-4 m/s; 5) and (3) carrying out laminar cooling on a steel plate with the thickness of 15-30 mm after rolling, wherein the final cooling temperature is 670 +/-20 ℃, and the cooling speed is 10 ℃/s.
In order to ensure the corrosion resistance requirement of the steel BGNS440 for resisting the sulfuric acid dew point corrosion in the using process, the steel plates in the example 1 and the comparative example 1 are respectively subjected to a uniform corrosion full immersion test in a metal material laboratory. The full-immersion corrosion test is carried out by simulating the environment of a bulk curing barn, the execution standard is the technical specification of the bulk curing barn, the corrosion test is carried out according to JB/T7901-2001, Uniform corrosion full-immersion test method in a metal material laboratory, and the test result table is as follows:
example 2:
the acid corrosion resistant BGNS440 steel is required to obtain excellent sulfuric acid corrosion resistance, and the molten steel has good purity and reasonable microalloying design, and the segregation and inclusion of the molten steel in the solidification process are reduced.
The steel plate comprises the following specific components: 0.05 percent of C, 0.45 percent of Mn, 0.10 percent of Si, 0.010 percent of Al, 0.55 percent of Cr, 0.015 percent of Ti, 0.10 percent of Ni, 0.012 percent of P, less than or equal to 0.0080 percent of S, 0.0060 percent of N, 0.0030 percent of O, 0.040 percent of Sb, 0.25 percent of Cu0, and the balance of Fe and inevitable impurities.
The preparation method comprises the following steps: 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
Pretreating the furnace S to be 0.003 percent, and removing slag; 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, the flow scattering is avoided, and steel ladle Als is controlled according to 0.005%; the steel ladle N is required to be 30ppm, 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 10 ppm; the LF adopts active lime and fluorite to produce reducing slag with good fluidity, so that the molten steel is prevented from being exposed as much as possible; performing calcium treatment after RH treatment, increasing soft blowing time by 10 minutes, and strictly controlling inclusions in the 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. Blowing a middle ladle by argon before casting, wherein no molten steel is exposed in the casting process, strictly controlling the water mouth to suck N, and controlling the increase of N to be 5 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 tundish is controlled according to the superheat degree which is less than or equal to 30 ℃.
Second, hot rolling
1. Slab and heating zone
The tapping temperature of the plate blank is more than or equal to 1200 ℃. 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; the outlet temperature of the finish rolling is 860 ℃; the coiling temperature target is 600 ℃. And the post-stage continuous cooling mode of the cooling mode ensures the accurate control of the finish rolling and coiling temperatures.
Example 3:
the acid corrosion resistant BGNS440 steel is required to obtain excellent sulfuric acid corrosion resistance, and the molten steel has good purity and reasonable microalloying design, and the segregation and inclusion of the molten steel in the solidification process are reduced.
The steel plate comprises the following specific components: 0.08 percent of C, 0.65 percent of Mn, 0.30 percent of Si, 0.050 percent of Al, 0.70 percent of Cr, 0.035 percent of Ti, 0.20 percent of Ni, 0.012 percent of P, 0.0080 percent of S, 0.0060 percent of N, 0.0030 percent of O, 0.200 percent of Sb, 0.50 percent of Cu0.50 percent, and the balance of Fe and inevitable impurities.
The preparation method comprises the following steps: 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
Pretreating the S-shaped steel sheet fed into the furnace to be 0.002 percent, and removing the slag; 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, the flow scattering is avoided, and steel ladle Als is controlled according to 0.008%; the steel ladle N is required to be 20ppm, 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 7 ppm; the LF adopts active lime and fluorite to produce reducing slag with good fluidity, so that the molten steel is prevented from being exposed as much as possible; performing calcium treatment after RH treatment, increasing soft blowing time by 10 minutes, and strictly controlling inclusions in the 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. Blowing a middle ladle by argon before casting, strictly controlling N absorption at a water port and controlling N increase to be 2ppm in the casting process until no molten steel is exposed; 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 tundish is controlled according to the superheat degree which is less than or equal to 30 ℃.
Second, hot rolling
1. Slab and heating zone
The tapping temperature of the plate blank is more than or equal to 1200 ℃. 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; the outlet temperature of the finish rolling is 860 ℃; the coiling temperature target is 600 ℃. And the post-stage continuous cooling mode of the cooling mode ensures the accurate control of the finish rolling and coiling temperatures.
The acid corrosion resistant BGNS440 steel produced by the process has various mechanical properties meeting the index requirements and excellent acid 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 (8)
1. The acid corrosion resistant BGNS440 steel hot-rolled coil is characterized by comprising the following components in percentage by weight: 0.05 to 0.08 percent of C, 0.45 to 0.65 percent of Mn, 0.10 to 0.30 percent of Si, 0.010 to 0.050 percent of Al, 0.55 to 0.70 percent of Cr, 0.015 to 0.035 percent of Ti, 0.10 to 0.20 percent of Ni, less than or equal to 0.012 percent of P, less than or equal to 0.0080 percent of S, less than or equal to 0.0060 percent of N, less than or equal to 0.0030 percent of O, 0.040 to 0.200 percent of Sb, 0.25 to 0.50 percent of Cu, and the balance of Fe and inevitable impurities.
2. The acid corrosion resistant BGNS440 hot rolled steel sheet coil of claim 1, consisting of, in weight percent: 0.063% of C, 0.58% of Mn, 0.19% of Si, 0.018% of Al, 0.58% of Cr, 0.018% of Ti0.018% of Ni, 0.148% of P, 0.0103% of S, 0.0050% of N, 0.0024% of O, 0.050% of Sb, 0.32% of Cu0.32% and the balance of Fe and inevitable impurities.
3. A preparation method of an acid corrosion resistant BGNS440 steel hot rolled coil is characterized by comprising the following process flows of: 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 BGNS440 steel hot-rolled coil as claimed in claim 3, wherein the refining is followed by calcification, soft blowing time is increased by 10 minutes, inclusions in molten steel are controlled, and A, B, C, D type inclusions are required to be less than or equal to 2.0 grade; the whole process adopts protective pouring.
5. The method for preparing the acid corrosion resistant BGNS440 hot rolled coil as claimed in claim 3, wherein the heating schedule is as follows: the tapping temperature of the plate blank is more than or equal to 1200 ℃; the outlet temperature of the finish rolling is 860 ℃; the coiling temperature target is 600 ℃.
6. The method for preparing the acid corrosion resistant BGNS440 steel hot rolled coil as claimed in claim 3, wherein in the converter process, the content of ladle Als is controlled according to 0.005-0.015%, and N is less than or equal to 30 ppm.
7. The method for preparing the acid corrosion resistant BGNS440 steel hot-rolled coil as claimed in claim 3, wherein the N increase in the refining process is less than or equal to 10 ppm; the quantity of N added in the continuous casting procedure is less than or equal to 5 ppm.
8. The method for preparing the acid corrosion resistant BGNS440 steel hot-rolled coil as claimed in claim 3, wherein in the continuous casting process, the tundish is controlled according to the superheat degree of less than or equal to 30 ℃.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112941424A (en) * | 2021-02-10 | 2021-06-11 | 中国铁道科学研究院集团有限公司金属及化学研究所 | Novel corrosion-resistant steel for railway vehicle and manufacturing method thereof |
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