CN115044829A - Corrosion-resistant steel and preparation method thereof - Google Patents
Corrosion-resistant steel and preparation method thereof Download PDFInfo
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- 238000002360 preparation method Methods 0.000 title abstract description 6
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 82
- 239000010959 steel Substances 0.000 claims abstract description 82
- 238000005266 casting Methods 0.000 claims abstract description 16
- 238000007670 refining Methods 0.000 claims description 24
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 12
- 239000010949 copper Substances 0.000 claims description 12
- 229910052799 carbon Inorganic materials 0.000 claims description 11
- 238000009749 continuous casting Methods 0.000 claims description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 10
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 9
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 9
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- 229910045601 alloy Inorganic materials 0.000 claims description 6
- 239000000956 alloy Substances 0.000 claims description 6
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- 229910000628 Ferrovanadium Inorganic materials 0.000 claims description 5
- 239000000498 cooling water Substances 0.000 claims description 5
- PNXOJQQRXBVKEX-UHFFFAOYSA-N iron vanadium Chemical compound [V].[Fe] PNXOJQQRXBVKEX-UHFFFAOYSA-N 0.000 claims description 5
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- 238000002844 melting Methods 0.000 claims description 4
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- 229910000604 Ferrochrome Inorganic materials 0.000 claims description 3
- 229910000519 Ferrosilicon Inorganic materials 0.000 claims description 3
- 229910000720 Silicomanganese Inorganic materials 0.000 claims description 3
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 3
- MKPXGEVFQSIKGE-UHFFFAOYSA-N [Mg].[Si] Chemical compound [Mg].[Si] MKPXGEVFQSIKGE-UHFFFAOYSA-N 0.000 claims description 3
- 229910052786 argon Inorganic materials 0.000 claims description 3
- 239000011575 calcium Substances 0.000 claims description 3
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- 239000000243 solution Substances 0.000 description 1
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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
-
- 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
-
- 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
- C21C7/072—Treatment with gases
-
- 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
-
- 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
-
- 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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/20—Ferrous alloys, e.g. steel alloys containing chromium with copper
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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
-
- 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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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
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- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Treatment Of Steel In Its Molten State (AREA)
- Heat Treatment Of Steel (AREA)
- Continuous Casting (AREA)
Abstract
The invention discloses corrosion-resistant steel and a preparation method thereof in the field of steel casting, wherein the corrosion-resistant steel comprises the following components: 0.13-0.15% of C element, 0.68-0.72% of Si element, 1.48-1.55% of Mn element, 0.075-0.085% of V element, 0.055-0.065% of P element, less than or equal to 0.010% of S element, 0.32-0.38% of Cu element, 0.32-0.38% of Cr element and less than or equal to 0.54% of Ceq; effectively improves the quality of the casting blank and the performance of the rolled material.
Description
Technical Field
The invention relates to the field of steel casting, in particular to corrosion-resistant steel and a preparation method thereof.
Background
With the massive construction of projects such as the Chuanzang line, deformed steel bars are applied in various inland projects in large batch, and higher requirements are provided for the durability of a reinforced concrete structure in natural environments represented by complex natural environments along the Chuanzang line and inland industrial atmospheric environments. At present, in order to improve the durability of a reinforced concrete structure, measures such as adding a corrosion inhibitor, coating a protective layer on the surface of concrete, adopting corrosion-resistant reinforcing steel bars, reinforcing steel bar coating, applying cathodic protection and the like are mainly adopted. Corrosion resistant rebar is the last barrier to prevent premature failure of reinforced concrete due to rebar corrosion. The existing corrosion-resistant steel bar has poor component proportion, poor internal quality of a casting blank, and performance of a rolled material which is generally lower than 400Mpa cannot meet the strength requirement.
Therefore, it is urgently needed to provide corrosion-resistant steel and a preparation method thereof to solve the technical problems.
Disclosure of Invention
The invention aims to provide corrosion-resistant steel and a preparation method thereof, which can effectively improve the quality of a casting blank and the performance of a rolled material.
In order to achieve the above object, the present invention provides a corrosion-resistant steel, which comprises the following components: 0.13 to 0.15 percent of C element, 0.68 to 0.72 percent of Si element, 1.48 to 1.55 percent of Mn element, 0.075 to 0.085 percent of V element, 0.055 to 0.065 percent of P element, less than or equal to 0.010 percent of S element, 0.32 to 0.38 percent of Cu element, 0.32 to 0.38 percent of Cr element and less than or equal to 0.54 percent of Ceq.
The invention also provides a method for preparing the corrosion-resistant steel, which comprises the following steps:
s1, adding molten iron, scrap steel and copper into the LD converter, and blowing oxygen into the LD converter from the top of the LD converter by an oxygen spray gun in a descending manner to melt the scrap steel into molten steel;
s2, when the temperature of the molten steel is more than or equal to 1620 ℃, the content of C element in the molten steel is less than or equal to 0.08%, and the content of P element in the molten steel is less than or equal to 0.045%, the molten steel is poured into a steel ladle from a steel tapping hole;
s3, in the LD converter tapping process, sequentially adding a deoxidizer, an alloy, lime and a slag melting agent, and stopping slag when tapping;
s4, transferring the molten steel into an LF refining furnace for refining, stirring in the refining process to homogenize the components and the temperature of the molten steel, wherein the refining time is more than or equal to 35 min;
s5, adding lime and fluorite for slag adjustment in the refining process, adding silicon-magnesium powder for diffusion deoxidation, and making yellow white slag according to the sulfur content in molten steel;
s6, feeding pure calcium wires, and then performing argon soft blowing for more than or equal to 10 min;
and S7, after the refining is finished, pouring the molten steel into a continuous casting machine to cast a billet.
Preferably, the molten iron in S1 includes: the content of Si element is less than or equal to 0.70 percent, the content of P element is less than or equal to 0.120 percent, the content of S element is less than or equal to 0.030 percent, and the slag carrying amount is less than or equal to 0.5 percent.
Preferably, the loading amount of the scrap steel in S1 is 130-140 t, and the loading amount of the copper is 3.2kg/t steel.
Preferably, the addition amount of the deoxidizer in the S3 is 150 kg/furnace, the addition amount of the slag melting agent is 100 kg/furnace, the addition amount of the lime is 500 kg/furnace, and the types and the addition amounts of the alloy are respectively as follows: 20.5kg/t molten steel of silicomanganese, 4kg/t molten steel of low-carbon ferrochrome, 4kg/t molten steel of ferrosilicon, 50 kg/furnace of ferrovanadium and 0.7kg/t molten steel of vanadium-nitrogen alloy.
Preferably, the temperature of the molten steel in S4 entering the LF refining furnace is more than or equal to 1530 ℃, and the composition requirements are as follows: the content of C element is less than or equal to 0.10%, the content of Si element is 0.50-0.60%, the content of Mn element is 1.44-1.52%, the content of Cu element is 0.28-0.35%, the content of V element is 0.074-0.078%, and the content of Cr element is 0.24-0.31%.
Preferably, before the molten steel in the S4 enters the LF refining furnace, the molten steel is electrified to break a slag layer for sampling, the adding amount of ferrophosphorus is adjusted according to the components of the sample, and the content of the S element is controlled to be less than or equal to 0.10%.
Preferably, the amount of primary cooling water during casting by said continuous casting machine in S7 is 115m 3 /h，The specific water amount of the secondary cooling water is 0.5L/kg molten steel.
Preferably, the casting speed of the continuous casting machine in S7 is 1.4m/min, and the superheat degree is 25-35 ℃.
According to the technical scheme, the corrosion-resistant steel is optimized in components, the purpose is to improve the strength, the performance of a rolled material is ensured to be higher than 400Mpa, the content of a target C element is improved to 0.14%, the content of a Mn element is improved to 1.52%, the content of a V element is improved to 0.08, the content of a Si element is improved to 0.70%, the strength performance index of the corrosion-resistant threaded material is further improved, the strength requirement is ensured to be met, the internal quality of a casting blank is improved, and the nitrogen content increasing mode in the steel is improved, so that the performance of the rolled material is improved. A cold water of 115m 3 The specific water amount is 0.5L/kg, the superheat degree is 25-35 ℃, the drawing speed is 1.4m/min, and the internal quality of casting blanks such as center porosity, center cracks, corner cracks and the like is effectively reduced.
Additional features and advantages of the invention will be set forth in the detailed description which follows.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
FIG. 1 is a table showing the composition of the corrosion-resistant steel of the present invention before the composition adjustment;
FIG. 2 is a composition table of the corrosion-resistant steel of the present invention after the composition adjustment;
FIG. 3 is a table of parameters of the casting blank in the continuous casting machine of the present invention.
Detailed Description
The following describes in detail embodiments of the present invention with reference to the drawings. It should be understood that the detailed description and specific examples, while indicating the preferred embodiment of the invention, are given by way of illustration and explanation only, not limitation.
The invention provides corrosion-resistant steel, which comprises the following components: 0.13 to 0.15 percent of C element, 0.68 to 0.72 percent of Si element, 1.48 to 1.55 percent of Mn element, 0.075 to 0.085 percent of V element, 0.055 to 0.065 percent of P element, less than or equal to 0.010 percent of S element, 0.32 to 0.38 percent of Cu element, 0.32 to 0.38 percent of Cr element and less than or equal to 0.54 percent of Ceq.
The C element plays a role in solid solution strengthening, can improve the strength of steel and can also improve the yield ratio, but the welding performance is influenced and the plasticity is reduced due to the excessively high content of the C element, so that the content of the C element is 0.10-0.16%, preferably 0.13-0.15%, and the target content is 0.14%.
Si element plays a role of solid solution strengthening and can improve the strength of the steel, but the toughness and plasticity of the steel are reduced when the content is too high, so that the content of the Si element is 0.65-0.75%, preferably 0.68-0.72%, and the target content is 0.7% in the invention.
The Mn element plays a role in solid solution strengthening, the strength and hardenability of the steel are obviously improved, the pearlite content is improved, and the yield ratio is improved, but the increase of the Mn element can cause the increase of the production cost, and simultaneously promote the coarseness of crystal grains; therefore, in the invention, the content of the Mn element is 1.45-1.60%, preferably 1.48-1.55%, and the target content is 1.52%.
The V element is a main strengthening element, a formed V (C, N) compound has a strong pinning effect on grain boundaries and dislocation, crystal grains can be refined, the strength can be obviously improved, but the V (C, N) is easy to precipitate along the grain boundaries to form casting blank surface cracks, and the rolling of steel rolling is not facilitated, and in the invention, the content of the V element is controlled to be 0.070-0.090%, preferably 0.075-0.085%, and the target content is 0.08%.
The purpose of increasing the contents of C, Mn and V elements is to increase the carbon equivalent so as to increase the strength performance of the rolled material, and based on the content of 0.10 percent of C element, 1.42 percent of Mn element, 0.035 percent of V element and 0.30 percent of Cr element before improvement, the performance of the rolled material is lower than or close to 400Mpa and does not meet the standard requirement. Therefore, the composition of the corrosion-resistant steel is optimized, the strength is improved, the performance of the rolled material is ensured to be higher than 400Mpa, the content of the target C element is improved to 0.14 percent, the content of the Mn element is improved to 1.52 percent, the content of the V element is improved to 0.08 percent, the content of the Si element is improved to 0.70 percent, the strength performance index of the corrosion-resistant threaded material is further improved, the strength requirement is ensured to be met, the internal quality of a casting blank is improved, and the nitrogen content increasing mode in the steel is improved, so that the performance of the rolled material is improved.
The invention also provides a method for preparing the corrosion-resistant steel, which comprises the following steps:
s1, adding molten iron, scrap steel and copper into the LD converter, and blowing oxygen into the LD converter from the top of the LD converter by an oxygen spray gun in a descending manner to melt the scrap steel into molten steel;
s2, when the temperature of the molten steel is more than or equal to 1620 ℃, and the content of C element in the molten steel is less than or equal to 0.08%, and the content of P element in the molten steel is less than or equal to 0.045%, injecting the molten steel into a steel ladle from a steel tapping hole;
s3, in the LD converter tapping process, sequentially adding a deoxidizer, an alloy, lime and a slag melting agent, and stopping slag when tapping;
s4, transferring the molten steel into an LF refining furnace for refining, stirring in the refining process to homogenize the components and the temperature of the molten steel, wherein the refining time is more than or equal to 35 min;
s5, adding lime and fluorite for slag adjustment in the refining process, adding silicon-magnesium powder for diffusion deoxidation, and making yellow white slag according to the sulfur content in molten steel;
s6, feeding pure calcium wires, and then performing argon soft blowing for more than or equal to 10 min;
and S7, after the refining is finished, pouring the molten steel into a continuous casting machine to cast a billet.
In this embodiment, the molten iron in S1 includes the following components: the content of Si element is less than or equal to 0.70 percent, the content of P element is less than or equal to 0.120 percent, the content of S element is less than or equal to 0.030 percent, and the amount of slag is less than or equal to 0.5 percent.
In the present embodiment, the amount of scrap steel charged in S1 is 130 to 140t, and the amount of copper charged is 3.2kg/t steel.
In the present embodiment, the deoxidizer in S3 is added in an amount of 150 kg/furnace, the slagging agent is added in an amount of 100 kg/furnace, and the lime is added in an amount of 500 kg/furnace, and the types and amounts of the alloys are as follows: 20.5kg/t molten steel of silicomanganese, 4kg/t molten steel of low-carbon ferrochrome, 4kg/t molten steel of ferrosilicon, 50 kg/furnace of ferrovanadium and 0.7kg/t molten steel of vanadium-nitrogen alloy. The nitrogen increase is changed from original ferrovanadium 0.6kg/t molten steel to ferrovanadium 50 kg/furnace, and the rest is adjusted by vanadium-nitrogen alloy 0.70 kg/t; the nitrogen content increasing mode in the steel is improved, thereby improving the performance of rolled stock.
In the embodiment, the temperature of the molten steel in S4 entering the LF refining furnace is more than or equal to 1530 ℃, and the component requirements are as follows: the content of C element is less than or equal to 0.10%, the content of Si element is 0.50-0.60%, the content of Mn element is 1.44-1.52%, the content of Cu element is 0.28-0.35%, the content of V element is 0.074-0.078%, and the content of Cr element is 0.24-0.31%.
In the embodiment, before the molten steel in S4 enters the LF refining furnace, the molten steel is electrically conveyed to break a slag layer for sampling, the adding amount of ferrophosphorus is adjusted according to the components of the sample, and the content of the S element is controlled to be less than or equal to 0.10%.
In this embodiment, in the casting process of the continuous casting machine in S7, the amount of primary cooling water was 115m 3 The specific water amount of the secondary cooling water is 0.5L/kg molten steel.
In the present embodiment, the drawing speed of the continuous casting machine in S7 is 1.4m/min, and the degree of superheat is 25 to 35 ℃. In the early stage of development, 125m cold water 3 H, specific water amount of 0.7L/kg molten steel, superheat degree of about 35 ℃, pulling speed of 1.2-1.3m/min, internal quality and surface quality of casting blank can not be guaranteed, and then adjusting to present cooling parameter of 115m cold water by groping 3 The specific water amount is 0.5L/kg, the superheat degree is 25-35 ℃, the drawing speed is 1.4m/min, and the internal quality of casting blanks such as center porosity, center cracks, corner cracks and the like is effectively reduced.
The preferred embodiments of the present invention have been described in detail with reference to the accompanying drawings, however, the present invention is not limited to the specific details of the above embodiments, and various simple modifications can be made to the technical solution of the present invention within the technical idea of the present invention, and these simple modifications are within the protective scope of the present invention.
It should be noted that the various technical features described in the above embodiments can be combined in any suitable manner without contradiction, and the invention is not described in any way for the possible combinations in order to avoid unnecessary repetition.
In addition, any combination of the various embodiments of the present invention is also possible, and the same should be considered as the disclosure of the present invention as long as it does not depart from the spirit of the present invention.
Claims (9)
1. The corrosion-resistant steel is characterized by comprising the following components: 0.13 to 0.15 percent of C element, 0.68 to 0.72 percent of Si element, 1.48 to 1.55 percent of Mn element, 0.075 to 0.085 percent of V element, 0.055 to 0.065 percent of P element, less than or equal to 0.010 percent of S element, 0.32 to 0.38 percent of Cu element, 0.32 to 0.38 percent of Cr element and less than or equal to 0.54 percent of Ceq.
2. A method of producing the corrosion-resistant steel of claim 1, comprising the steps of:
s1, adding molten iron, scrap steel and copper into the LD converter, and blowing oxygen into the LD converter from the top of the LD converter by an oxygen spray gun in a descending manner to melt the scrap steel into molten steel;
s2, when the temperature of the molten steel is more than or equal to 1620 ℃, and the content of C element in the molten steel is less than or equal to 0.08%, and the content of P element in the molten steel is less than or equal to 0.045%, injecting the molten steel into a steel ladle from a steel tapping hole;
s3, in the LD converter tapping process, sequentially adding a deoxidizer, an alloy, lime and a slag melting agent, and stopping slag when tapping;
s4, transferring the molten steel into an LF refining furnace for refining, stirring in the refining process to homogenize the components and the temperature of the molten steel, wherein the refining time is more than or equal to 35 min;
s5, adding lime and fluorite for slag adjustment in the refining process, adding silicon-magnesium powder for diffusion deoxidation, and making yellow white slag according to the sulfur content in molten steel;
s6, feeding pure calcium wires, and then performing argon soft blowing for more than or equal to 10 min;
and S7, after the refining is finished, pouring the molten steel into a continuous casting machine to cast a billet.
3. The method according to claim 2, wherein the molten iron in S1 comprises the following components: the content of Si element is less than or equal to 0.70 percent, the content of P element is less than or equal to 0.120 percent, the content of S element is less than or equal to 0.030 percent, and the slag carrying amount is less than or equal to 0.5 percent.
4. The method according to claim 3, wherein the scrap steel is charged in S1 in an amount of 130 to 140t, and the copper is charged in an amount of 3.2kg/t steel.
5. The method of claim 4, wherein the deoxidizer is added in S3 in an amount of 150 kg/furnace, the slagging agent is added in an amount of 100 kg/furnace, and the lime is added in an amount of 500 kg/furnace, and the alloy types and the addition amounts are respectively: 20.5kg/t molten steel of silicomanganese, 4kg/t molten steel of low-carbon ferrochrome, 4kg/t molten steel of ferrosilicon, 50 kg/furnace of ferrovanadium and 0.7kg/t molten steel of vanadium-nitrogen alloy.
6. The method as claimed in claim 5, wherein the temperature of the molten steel in S4 entering the LF refining furnace is more than or equal to 1530 ℃, and the composition requires that: the content of C element is less than or equal to 0.10%, the content of Si element is 0.50-0.60%, the content of Mn element is 1.44-1.52%, the content of Cu element is 0.28-0.35%, the content of V element is 0.074-0.078%, and the content of Cr element is 0.24-0.31%.
7. The method as claimed in claim 2, wherein before the molten steel in S4 enters the LF refining furnace, the molten steel is electrically conveyed to break a slag layer for sampling, the addition amount of ferrophosphorus is adjusted according to the sample components, and the content of S element is controlled to be less than or equal to 0.10%.
8. The method as claimed in claim 2, wherein an amount of primary cold water is 115m during the casting by the continuous casting machine in S7 3 The specific water amount of the secondary cooling water is 0.5L/kg molten steel.
9. The method according to claim 2, wherein the strand casting machine in S7 has a strand drawing speed of 1.4m/min and a degree of superheat of 25 to 35 ℃.
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