CN109022731B - High-strength high-corrosion-resistance duplex stainless deformed steel bar and production method thereof - Google Patents
High-strength high-corrosion-resistance duplex stainless deformed steel bar and production method thereof Download PDFInfo
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 52
- 239000010959 steel Substances 0.000 title claims abstract description 52
- 238000004519 manufacturing process Methods 0.000 title claims description 11
- 229910052779 Neodymium Inorganic materials 0.000 claims abstract description 3
- 229910052777 Praseodymium Inorganic materials 0.000 claims abstract description 3
- 238000005096 rolling process Methods 0.000 claims description 25
- 238000005266 casting Methods 0.000 claims description 21
- 238000007670 refining Methods 0.000 claims description 13
- 238000010438 heat treatment Methods 0.000 claims description 11
- 238000010008 shearing Methods 0.000 claims description 8
- 239000002893 slag Substances 0.000 claims description 7
- 238000001816 cooling Methods 0.000 claims description 6
- 230000007547 defect Effects 0.000 claims description 6
- 230000006698 induction Effects 0.000 claims description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 6
- 238000010079 rubber tapping Methods 0.000 claims description 6
- 239000011575 calcium Substances 0.000 claims description 5
- 239000000126 substance Substances 0.000 claims description 5
- 229910000859 α-Fe Inorganic materials 0.000 claims description 5
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 4
- 238000009749 continuous casting Methods 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims description 4
- 238000002791 soaking Methods 0.000 claims description 4
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims description 3
- 229910052791 calcium Inorganic materials 0.000 claims description 3
- 229910052804 chromium Inorganic materials 0.000 claims description 3
- 238000005261 decarburization Methods 0.000 claims description 3
- 229910052750 molybdenum Inorganic materials 0.000 claims description 3
- 229910052721 tungsten Inorganic materials 0.000 claims description 3
- 238000003723 Smelting Methods 0.000 claims description 2
- 239000000956 alloy Substances 0.000 claims description 2
- 229910052782 aluminium Inorganic materials 0.000 claims description 2
- 229910001566 austenite Inorganic materials 0.000 claims description 2
- 238000005520 cutting process Methods 0.000 claims description 2
- 229910052742 iron Inorganic materials 0.000 claims description 2
- 229910052759 nickel Inorganic materials 0.000 claims description 2
- 238000004806 packaging method and process Methods 0.000 claims description 2
- 239000008188 pellet Substances 0.000 claims description 2
- 238000005554 pickling Methods 0.000 claims description 2
- 238000005498 polishing Methods 0.000 claims description 2
- 238000004321 preservation Methods 0.000 claims description 2
- 229910001039 duplex stainless steel Inorganic materials 0.000 description 10
- 238000005260 corrosion Methods 0.000 description 8
- 230000007797 corrosion Effects 0.000 description 7
- 238000011161 development Methods 0.000 description 7
- 238000010276 construction Methods 0.000 description 6
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 4
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 4
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 229910000975 Carbon steel Inorganic materials 0.000 description 2
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 2
- 239000010962 carbon steel Substances 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 229910000963 austenitic stainless steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003749 cleanliness Effects 0.000 description 1
- 239000004567 concrete Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000005098 hot rolling Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 239000011150 reinforced concrete Substances 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
Classifications
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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
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
-
- 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
-
- 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
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
-
- 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
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
-
- 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
- C22C38/005—Ferrous alloys, e.g. steel alloys containing rare earths, i.e. Sc, Y, Lanthanides
-
- 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
- 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
-
- 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
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
-
- 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
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/54—Ferrous alloys, e.g. steel alloys containing chromium with nickel with boron
-
- 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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/001—Austenite
-
- 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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/005—Ferrite
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
The high-strength high-corrosion-resistance duplex stainless deformed steel bar provided by the invention comprises, by weight, not more than 0.030% of C, 24.00-26.00% of Cr24.00, 6.00-8.00% of Nis, 2.00-4.00% of Mos, 1.00-2.00% of W, 0.24-0.32% of N, not more than 1.20% of Mn, not more than 0.50% of Cu, not more than 0.80% of Si, less than 0.035% of P, less than 0.020% of S, less than 0.010% of B, 0.003-0.005% of Mg0.008% of Ca, 0.04-0.10% of RE, wherein the RE is any one or any two, three or four of Ce, L a, Pr and Nd mixed in any proportion, and the balance Fe..
Description
Technical Field
The invention relates to the technical field of stainless threaded steel, in particular to high-strength high-corrosion-resistance duplex stainless threaded steel and a production method thereof.
Background
The sea area of China is wide, the sea area spans tropical zone, subtropical zone and temperate zone, the coastline is as long as more than 3 thousands kilometers, the ocean resources are abundant, especially the oil and gas resources, and the development potential is huge. China will develop ocean economy vigorously and accelerate the comprehensive development of coastal areas, and the ocean economy becomes a new growth point for the development of national economy. The ocean engineering construction industry is used as an important component of ocean economy and a basic industry for ocean economy development, has wide development prospect, and can greatly promote the prosperity and development of the reinforcing steel bar matched with the ocean engineering construction industry for the ocean engineering construction industry.
The steel bar material for marine construction engineering is mainly used for marine engineering construction such as coastal engineering, offshore engineering, open sea and the like, and has very bad service environment. The factors of high chloride ion concentration, high temperature, high humidity, surge, splashing, many marine organisms and the like all provide severe tests on the corrosion resistance and the mechanical property of the steel bar material. The fatal weakness of carbon steel bars which are used in a large number of common reinforced concrete structures at present is that the carbon steel bars have poor chloride ion pitting corrosion resistance and are easy to be corroded in a marine environment, so that the structural performance is degraded, and the service life of the concrete structure is seriously shortened. In recent years, stainless steel bars, such as austenitic stainless steel bars 304 and 316, 2205 duplex stainless steel bars and 2304 and 2101 economical duplex stainless steel bars, are developed and used successively in the countries of europe and america in order to meet the design requirements of 100-year service life of buildings and reduce the later maintenance cost of buildings. With the overall implementation of ocean strategies in China, key ocean construction projects such as cross-sea bridges, submarine tunnels, islands and the like will enter the rapid development stage in the coming years, and high-strength (yield strength is more than or equal to 600MPa) and high-corrosion-resistance (PREN is more than or equal to 40) duplex stainless steel bars have huge potential market demands on the advantages of high performance and life cycle cost.
However, the high-strength high-corrosion-resistance duplex stainless steel reinforcing steel bar has high nitrogen content, large deformation resistance, poor thermoplasticity, more complex harmful phase precipitation behavior in steel, obvious influence on performance, easy rolling cracking of transverse and longitudinal ribs on the surface of the reinforcing steel bar, long fixed length and high flatness requirement, so the production technology of the high-strength high-corrosion-resistance duplex stainless steel reinforcing steel bar has higher difficulty.
Disclosure of Invention
Aiming at the technical problems, the invention provides high-strength high-corrosion-resistance duplex stainless deformed steel bar and a production method thereof.
The high-strength high-corrosion-resistance duplex stainless deformed steel bar comprises the following chemical components, by weight, not more than 0.030% of C, 24.00-26.00% of Cr24.00, 6.00-8.00% of Nis, 2.00-4.00% of Mos, 1.00-2.00% of W, 0.24-0.32% of N, not more than 1.20% of Mn, not more than 0.50% of Cu, not more than 0.80% of Si, less than 0.035% of P, less than 0.020% of S, less than 0.010% of B, 0.003-0.005% of Mg0.008% of Ca, 0.04-0.10% of RE, wherein the RE is any one or any two, three or four of Ce, L a, Pr and Nd mixed in any proportion, and the balance of Fe.
Preferably, the duplex stainless thread steel comprises an austenite phase and a ferrite phase, wherein the volume percentage of the ferrite phase is 40-60%.
In another aspect of the present invention, a method for producing a high-strength high-corrosion-resistance duplex stainless steel, the chemical components of which are in weight percent and the volume of ferrite phase is as described above, comprises the steps of:
the first step is electric furnace or induction furnace AOD refining-L F refining-square billet continuous casting
(1) Electric or induction furnace
Carrying out primary smelting on the converter molten iron and alloy materials in an electric furnace or an induction furnace, and controlling the content of P in the tapping molten steel to be less than or equal to 220 ppm;
(2) AOD refining
Adding the primary molten steel into an AOD furnace for refining, controlling the decarburization rate to be more than or equal to 0.15%/min, and controlling the contents of Cr, Ni, Mo and W during tapping to be: cr24.00-26.00%, Ni6.00-8.00%, Mo2.00-4.00%, and W1.00-2.00%;
(3) l F refining
The molten steel enters an L F station for refining, refining slag is added and is electrified for slagging, the binary alkalinity of L F refining slag is controlled to be more than or equal to 4.2, 1.3-1.6 kg of aluminum powder per ton of steel is added to the surface of the slag, 0.15-0.25 kg of aluminum pellets per ton of steel is added to the molten steel, then 0.005-0.008% of calcium wires are fed to the molten steel, the P content in the molten steel is controlled to be less than 200ppm, the S content is controlled to be less than 10ppm, and the class A and class B inclusions in the steel are controlled to be less than 0.5 level;
(4) continuous casting of square billets
Continuously casting to obtain a square billet, controlling the size of the square billet to be not more than 240 mm and x240 mm, and carrying out full polishing treatment on the surface of the casting blank;
the second step is that: heating-rolling finished product of casting blank
(1) Heating of casting blanks
Feeding the casting blank into a stepping heating furnace to be heated, wherein the casting blank sequentially passes through a preheating section, a heating section and a soaking section, the heat preservation time of the soaking section is 0.95-1.05 min for heating the casting blank with the thickness of each millimeter, and the tapping temperature is 1230-1260 ℃;
(2) cogging and cogging
Rolling the casting blank by a cogging mill for 8-11 times to form phi 75-90 mm round steel, wherein the temperature before cogging is 1200-1230 ℃, the temperature after cogging is 980-1080 ℃, and cooling for waiting;
(3) rough rolling
When the temperature of the blank is reduced to be below 900 ℃, the blank enters a roughing mill and is rolled to obtain phi 45-55 mm round steel;
(4) shearing and medium rolling
Cutting the defects of the head and the tail completely through shearing, then putting the cut defects into a medium rolling mill, and rolling the cut defects into round steel with the diameter of 30-38 mm, wherein the temperature after medium rolling is controlled to be more than or equal to 880 ℃;
(5) finish rolling and shearing
Rolling to finished product specification by a finishing mill, controlling the finishing temperature to be more than or equal to 850 ℃, sending the finish-rolled deformed steel bar into an inclined roller way pinch roll, shearing the deformed steel bar into required length by multiple lengths, cooling by a cooling bed, collecting, bundling, pickling, packaging and warehousing.
The invention has the beneficial effects that:
1. according to the high-strength high-corrosion-resistance duplex stainless deformed steel bar, the microalloy element (one or more of B, Mg and RE) is added, so that grains can be refined, the heating temperature is increased in the production process, the rolling pass is reduced, the risk of subsequent hot rolling cracking is reduced, and the surface quality of the product is improved.
2. According to the production method of the high-strength high-corrosion-resistance duplex stainless deformed steel bar, the decarburization rate of the AOD furnace, the binary alkalinity of the refining slag of the L F furnace, the aluminum-adding strengthening deoxidation and calcium treatment of the L F furnace are adopted, so that the P content in molten steel is less than 200ppm, the S content is less than 10ppm, and the A-class and B-class inclusions in the steel are all less than 0.5 grade, and the high cleanliness control of the molten steel is realized, so that the thermoplasticity of the steel is improved, the subsequent rolling is facilitated, and the corrosion resistance and the mechanical property of the steel bar are improved.
3. The pitting resistance equivalent index of the duplex stainless thread steel produced by the invention is more than or equal to 40, and the critical pitting temperature is more than or equal to 80 ℃ (reference standard ASTM G150, CPT measurement solution is 1M NaCl); the yield strength is more than or equal to 600MPa, the tensile strength is more than or equal to 850MPa, the yield ratio is more than or equal to 1.3, the elongation is more than or equal to 30, the room-temperature impact energy is more than or equal to 200J, and the excellent corrosion resistance and mechanical properties can meet the requirements of harsh marine environments (high chloride ion concentration, high temperature, high humidity, high salt and the like).
Detailed Description
In order to further understand the objects, structures, features and functions of the present invention, the following embodiments are described in detail.
The chemical compositions of the high-strength high-corrosion-resistance duplex stainless steel casting blank obtained according to the composition design range of the present invention are shown in table 1.
TABLE 1 chemical composition (wt%) of high-strength high-corrosion-resistance duplex stainless steel casting blank
The casting blank was heated and rolled with the process parameters as shown in table 2.
TABLE 2 casting blank heating and Rolling Process parameters
| Example 1 | Example 2 | Example 3 | Example 4 | |
| Heating temperature/. degree.C | 1230 | 1240 | 1250 | 1260 |
| Casting blank size/mm | 150×150 | 180×180 | 220×220 | 240×240 |
| Cogging pass/pass | 8 | 9 | 10 | 11 |
| Temperature before cogging/. degree.C | 1200 | 1210 | 1220 | 1230 |
| temperature/deg.C after cogging | 994 | 1026 | 1049 | 1077 |
| Rough rolling temperature/. degree.C | 893 | 896 | 891 | 889 |
| temperature/deg.C after intermediate rolling | 885 | 888 | 889 | 882 |
| Final Rolling temperature/. degree.C | 861 | 865 | 864 | 858 |
The high-strength high-corrosion-resistance duplex stainless steel of the four examples was subjected to corrosion resistance and mechanical property tests, and the results are shown in table 3.
TABLE 3 mechanical and Corrosion resistance of high-Strength high-Corrosion-resistant Duplex stainless deformed steels
| Example 1 | Example 2 | Example 3 | Example 4 | |
| Pitting resistance equivalent index | 44.40 | 43.21 | 41.82 | 40.82 |
| Critical pitting temperature/. deg.C | 86 | 83 | 89 | 87 |
| Yield strength/MPa | 662 | 675 | 679 | 685 |
| Tensile strength/MPa | 874 | 887 | 894 | 909 |
| Ratio of yield to strength | 1.32 | 1.31 | 1.31 | 1.33 |
| Elongation/percent | 39.3 | 38.4 | 36.9 | 34.5 |
| Impact work at room temperature/J | 248 | 232 | 240 | 227 |
Note that pitting resistance equivalent index ═% Cr +3.3 × (% Mo +0.5 ×% W) +16 ×% N
As can be seen from Table 3, the pitting equivalent index of the high-strength high-corrosion-resistance duplex stainless steel exceeds 40.82 (40.82-44.40), the critical pitting temperature exceeds 83 ℃ (83-89 ℃), the yield strength exceeds 662MPa (662-685 MPa), the tensile strength exceeds 874MPa (874-909 MPa), the yield ratio exceeds 1.31 (1.31-1.33), the elongation exceeds 34.5 (34.5-39.3), and the room-temperature impact power exceeds 227J (227-248J). The corrosion resistance and the mechanical property of the embodiment can meet the use requirements of the marine building in severe service environments (high chloride ion concentration, high temperature, high humidity and high salt).
The present invention has been described in relation to the above embodiments, which are only exemplary of the implementation of the present invention. It should be noted that the disclosed embodiments do not limit the scope of the invention. Rather, it is intended that all such modifications and variations be included within the spirit and scope of this invention.
Claims (2)
1. The production method of the high-strength high-corrosion-resistance duplex stainless threaded steel is characterized by comprising the following chemical components, by weight, less than or equal to 0.030% of C, 24.00-26.00% of Cr24, 7.11-8.00% of Ni, 2.00-4.00% of Mo2, 1.00-2.00% of W, 0.24-0.32% of N, less than or equal to 1.20% of Mn, less than or equal to 0.50% of Cu, less than or equal to 0.80% of Si, less than 0.035% of P, less than 0.020% of S, 0.004-0.010% of B, 0.003-0.005% of Mg0.008% of Ca, 0.04-0.10% of RE, wherein the RE is any one of Ce, L a, Pr and Nd or any two, three or four of the mixture of Ce, and the balance Fe, and the production method of the duplex stainless threaded steel comprises the following steps:
the first step is electric furnace or induction furnace AOD refining-L F refining-square billet continuous casting
(1) Electric or induction furnace
Carrying out primary smelting on the converter molten iron and alloy materials in an electric furnace or an induction furnace, and controlling the content of P in the tapping molten steel to be less than or equal to 220 ppm;
(2) AOD refining
Adding the primary molten steel into an AOD furnace for refining, controlling the decarburization rate to be more than or equal to 0.15%/min, and controlling the contents of Cr, Ni, Mo and W during tapping to be: cr24.00-26.00%, Ni7.11-8.00%, Mo2.00-4.00%, and W1.00-2.00%;
(3) l F refining
The molten steel enters an L F station for refining, refining slag is added and is electrified for slagging, the binary alkalinity of L F refining slag is controlled to be more than or equal to 4.2, 1.3-1.6 kg of aluminum powder per ton of steel is added to the surface of the slag, 0.15-0.25 kg of aluminum pellets per ton of steel is added to the molten steel, then 0.005-0.008% of calcium wires are fed to the molten steel, the P content in the molten steel is controlled to be less than 200ppm, the S content is controlled to be less than 10ppm, and the class A and class B inclusions in the steel are controlled to be less than 0.5 level;
(4) continuous casting of square billets
Continuously casting to obtain a square billet, controlling the size of the square billet to be not more than 240 mm and x240 mm, and carrying out full polishing treatment on the surface of the casting blank;
the second step is that: heating-rolling finished product of casting blank
(1) Heating of casting blanks
Feeding the casting blank into a stepping heating furnace to be heated, wherein the casting blank sequentially passes through a preheating section, a heating section and a soaking section, the heat preservation time of the soaking section is 0.95-1.05 min for heating the casting blank with the thickness of each millimeter, and the tapping temperature is 1230-1260 ℃;
(2) cogging and cogging
Rolling the casting blank by a cogging mill for 8-11 times to form phi 75-90 mm round steel, wherein the temperature before cogging is 1200-1230 ℃, the temperature after cogging is 980-1080 ℃, and cooling is waited;
(3) rough rolling
When the temperature of the blank is reduced to be below 900 ℃, the blank enters a roughing mill and is rolled to obtain phi 45-55 mm round steel;
(4) shearing and medium rolling
Cutting the defects of the head and the tail completely through shearing, then putting the cut defects into a medium rolling mill, and rolling the cut defects into round steel with the diameter of 30-38 mm, wherein the temperature after medium rolling is controlled to be more than or equal to 880 ℃;
(5) finish rolling and shearing
Rolling to finished product specification by a finishing mill, controlling the finishing temperature to be more than or equal to 850 ℃, sending the finish-rolled deformed steel bar into an inclined roller way pinch roll, shearing the deformed steel bar into required length by multiple lengths, cooling by a cooling bed, collecting, bundling, pickling, packaging and warehousing.
2. A method for producing a high-strength high-corrosion-resistance duplex stainless deformed steel bar as set forth in claim 1, wherein said duplex stainless deformed steel bar comprises an austenite phase and a ferrite phase, and wherein the volume ratio of the ferrite phase is 40 to 60%.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810905156.2A CN109022731B (en) | 2018-08-09 | 2018-08-09 | High-strength high-corrosion-resistance duplex stainless deformed steel bar and production method thereof |
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| CN201810905156.2A CN109022731B (en) | 2018-08-09 | 2018-08-09 | High-strength high-corrosion-resistance duplex stainless deformed steel bar and production method thereof |
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| CN109022731A CN109022731A (en) | 2018-12-18 |
| CN109022731B true CN109022731B (en) | 2020-07-17 |
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| CN112779471B (en) * | 2020-12-28 | 2022-03-22 | 湖州盛特隆金属制品有限公司 | Duplex stainless steel deformed steel bar for coastal super engineering and preparation process thereof |
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