CN115354243A - Niobium-containing double-phase stainless steel twisted steel and manufacturing method thereof - Google Patents
Niobium-containing double-phase stainless steel twisted steel and manufacturing method thereof Download PDFInfo
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- CN115354243A CN115354243A CN202211043703.3A CN202211043703A CN115354243A CN 115354243 A CN115354243 A CN 115354243A CN 202211043703 A CN202211043703 A CN 202211043703A CN 115354243 A CN115354243 A CN 115354243A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 80
- 239000010959 steel Substances 0.000 title claims abstract description 80
- 239000010955 niobium Substances 0.000 title claims abstract description 33
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 25
- 229910052758 niobium Inorganic materials 0.000 title claims abstract description 17
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 title claims abstract description 17
- 229910001220 stainless steel Inorganic materials 0.000 title claims description 7
- 239000010935 stainless steel Substances 0.000 title claims description 7
- 238000005096 rolling process Methods 0.000 claims abstract description 37
- 238000010438 heat treatment Methods 0.000 claims abstract description 31
- 238000000034 method Methods 0.000 claims abstract description 25
- 238000003723 Smelting Methods 0.000 claims abstract description 16
- 230000008569 process Effects 0.000 claims abstract description 14
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 12
- 229910000885 Dual-phase steel Inorganic materials 0.000 claims description 11
- 239000002994 raw material Substances 0.000 claims description 9
- 238000002791 soaking Methods 0.000 claims description 9
- 238000005266 casting Methods 0.000 claims description 7
- 229910052742 iron Inorganic materials 0.000 claims description 6
- 239000012535 impurity Substances 0.000 claims description 4
- 238000007670 refining Methods 0.000 claims description 4
- 229910052799 carbon Inorganic materials 0.000 claims description 3
- 238000002844 melting Methods 0.000 claims description 3
- 230000008018 melting Effects 0.000 claims description 3
- 229910052757 nitrogen Inorganic materials 0.000 claims description 3
- 229910052698 phosphorus Inorganic materials 0.000 claims description 3
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims description 2
- 238000002156 mixing Methods 0.000 claims description 2
- 238000009628 steelmaking Methods 0.000 claims description 2
- 229910000863 Ferronickel Inorganic materials 0.000 claims 1
- 238000009749 continuous casting Methods 0.000 abstract description 24
- 229910001039 duplex stainless steel Inorganic materials 0.000 abstract description 24
- 239000007769 metal material Substances 0.000 abstract description 2
- 229910000592 Ferroniobium Inorganic materials 0.000 description 7
- 230000000052 comparative effect Effects 0.000 description 6
- 238000001816 cooling Methods 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 238000012360 testing method Methods 0.000 description 5
- 229910001566 austenite Inorganic materials 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 229910000859 α-Fe Inorganic materials 0.000 description 3
- ZFGFKQDDQUAJQP-UHFFFAOYSA-N iron niobium Chemical compound [Fe].[Fe].[Nb] ZFGFKQDDQUAJQP-UHFFFAOYSA-N 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 238000004321 preservation Methods 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000004035 construction material Substances 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000004886 process control Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000033764 rhythmic process Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000002699 waste material 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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
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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
- C21D8/06—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires
- C21D8/08—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires for concrete reinforcement
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
- C22C33/06—Making ferrous alloys by melting using master alloys
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
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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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- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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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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- 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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- 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
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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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese
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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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/001—Austenite
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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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/005—Ferrite
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Abstract
The invention relates to the technical field of metal materials, in particular to a niobium-containing duplex stainless steel twisted steel and a manufacturing method thereof, wherein a proper amount of Nb is added into S32304 duplex stainless steel, and a duplex stainless steel product with a set yield strength is rolled by adopting the process of EAF furnace smelting, AOD furnace smelting, LF furnace smelting, continuous casting production of 180mm square billets, continuous casting billet heat treatment and twisted steel rolling by adopting a continuous rolling mill.
Description
Technical Field
The invention relates to the technical field of metal materials, in particular to a niobium-containing duplex stainless steel twisted steel and a manufacturing method thereof.
Background
With the continuous development of economy, people have higher and higher requirements on various living environments and construction of various infrastructures, and correspondingly, the performance of used related materials needs to be optimized and improved in a targeted manner according to the higher requirements, so that the infrastructure is more environment-friendly, more durable and more economical.
The twisted steel is used as a foundation construction material with a large using amount in concrete of various buildings, roads, bridges and the like, and has high strength and plasticity and good corrosion resistance, so that the infrastructures have longer service life and reduced maintenance cost.
The duplex stainless steel twisted steel is a kind of stainless steel bar which has austenite (gamma) and ferrite (alpha) structure, two phases exist independently and have proper proportion, so that it has the characteristics of both austenite stainless steel and ferrite stainless steel.
Compared with the stainless steel with a single austenite structure, the duplex stainless steel has better intergranular corrosion resistance and pitting corrosion resistance, and has high strength, good plasticity and toughness.
At present, duplex stainless steel bars are rolled by continuous casting billets, and the temperature of rolled materials is controlled in the rolling process to obtain enough yield strength. In the rolling process, because the temperature of the rolled material needs to be controlled, the rolling rhythm needs to be controlled inevitably, so that the production efficiency is low, the processing cost is high, and the process control is complex.
Disclosure of Invention
Aiming at the problems that the yield strength in the mechanical property of the duplex stainless thread steel bar is lower, the production efficiency is improved, the production cost is reduced and the like in the prior art, the invention aims to provide the duplex stainless thread steel bar containing niobium and the manufacturing method thereof, which can reduce the rolling process under the condition that the manufactured steel bar can reach high enough yield strength, improve the production efficiency and reduce the production cost.
In order to achieve the purpose, the invention provides the following technical scheme: a niobium-containing duplex stainless-threaded steel bar, the duplex stainless-threaded steel bar comprising, in weight percent: less than or equal to 0.030 percent of C, less than or equal to 1.0 percent of Si, less than or equal to 2.5 percent of Mn, less than or equal to 0.030 percent of S, less than or equal to 0.040 percent of P, and the weight percentage of Cr:21.5 to 24.5 percent, ni:3.0 to 5.5%, mo:0.05 to 0.6%, N:0.05 to 0.20%, cu:0.05 to 0.6 percent, nb:0.15 to 0.30 percent, and the balance of iron and inevitable impurities.
Preferably, the manufacturing method of the niobium-containing duplex stainless steel twisted steel comprises the following steps:
s1, molten steel preparation: adding a dual-phase steel raw material and a proper amount of ferroniobium into a steelmaking furnace, refining and fully mixing to prepare Nb-containing dual-phase steel molten steel with the weight percentage of 0.15 to 0.30 percent;
s2, preforming: continuously casting the molten steel prepared in the step S1 into a blank through a tundish and a crystallizer;
s3, heat treatment: sequentially carrying out preheating, heating and soaking processes on the blank obtained by the pre-forming of the S2;
s4, rolling and forming: and (4) feeding the blanks heated in the step (3) into a rolling mill to be rolled into the twisted steel.
Preferably, the preparing molten steel in the step S1 includes: firstly, putting a dual-phase steel raw material into an EAF furnace for melting and smelting to obtain dual-phase steel molten steel; then transferring the dual-phase steel molten steel in the EAF furnace to an AOD furnace, adding a proper amount of ferrocolumbium into the AOD furnace, and adding the ferrocolumbium into the molten steel to obtain Nb-containing molten steel with the weight percentage of 0.15-0.30%; and finally, putting the refined molten steel in the AOD furnace into an LF furnace for smelting to obtain purer molten steel.
Preferably, in the step S2, the molten steel produced in S1 is continuously cast into a 180mm square billet through a tundish and a crystallizer.
Preferably, the heat treatment in step S3 includes: rapidly preheating the blank to over 1000 ℃;
then heating the blank to 1140 to 1160 ℃, and keeping the temperature for no more than 60min; then soaking the blank to 1190 to 1210 ℃ and keeping the temperature for not more than 60min.
Preferably, the blank is heated to 1140 to 1160 ℃, and then the heat preservation time is 30 to 45min; soaking the blank to 1190-1210 ℃ and keeping the temperature for 25-35min.
Preferably, the temperature rising time of preheating and heating does not exceed 60min, and the temperature rising time of soaking does not exceed 40min.
Preferably, the heat treatment in step S3 is performed in a walking beam furnace.
Compared with the prior art, the invention has the beneficial effects that: the quantized Nb element is added into the duplex stainless steel on the basis of the original components, and experimental data show that the prepared steel bar can reach high enough yield strength under the condition of no need of controlled cooling in the rolling process of manufacturing the steel bar.
Drawings
FIG. 1 is a process flow diagram of an embodiment of the present invention.
Detailed Description
In order to better clarify the objects, technical solutions and advantages of the present invention, the following detailed description of the technical solutions in the embodiments of the manufacturing method of a niobium-containing duplex stainless steel bar according to the present invention is made with reference to the accompanying drawings by specific embodiments, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. Based on the technical scheme of the invention, other embodiments obtained by persons skilled in the art without creative work belong to the protection scope of the invention.
Referring to fig. 1, the present invention provides a method for manufacturing a niobium-containing duplex stainless steel twisted steel, comprising the following steps:
step S1 is molten steel preparation, firstly, pouring a double-phase steel raw material S32304 into an EAF furnace for melting and smelting, then transferring the double-phase steel molten steel in the EAF furnace into an AOD furnace, adding a proper amount of ferrocolumbium into the molten steel in the AOD furnace, and obtaining Nb-containing molten steel with the weight percentage of 0.15-0.30%; and finally, the refined molten steel in the AOD furnace is put into an LF furnace for smelting to obtain purer molten steel. The dual-phase steel raw material of S32304 comprises the following components in percentage by weight: less than or equal to 0.030 percent of C, less than or equal to 1.0 percent of Si, less than or equal to 2.5 percent of Mn, less than or equal to 0.030 percent of S, less than or equal to 0.040 percent of P, and the mass ratio of Cr:21.5 to 24.5%, ni:3.0 to 5.5%, mo:0.05 to 0.6%, N:0.05 to 0.20%, cu:0.05 to 0.6 percent, and the balance of iron and inevitable impurities.
Step S2 is a preforming process, namely continuously casting the molten steel prepared in the step S1 into a 180mm square billet through a tundish and a crystallizer; the tundish has the functions of stabilizing the flow, reducing the pressure, absorbing impurities, homogenizing the temperature of the molten steel, distributing and storing the molten steel; the crystallizer is used for enabling molten steel to be gradually solidified into a blank shell with required specification and shape, enabling the blank shell to be separated from the wall of the crystallizer without being broken and leaking steel through vibration of the crystallizer, and enabling a casting blank not to generate defects such as stripping, bulging, cracking and the like through adjustment of parameters of the crystallizer; the uniform and stable generation of the blank shell is ensured.
Step S3 is a heat treatment process, in which the continuous casting slab obtained in step S2 is sent to a walking beam furnace for heat treatment, and the following processes are required to be sequentially performed: in the preheating stage, the continuous casting blank is required to be heated to more than or equal to 1000 ℃ within 60min; then heating the continuous casting slab to 1140-1160 ℃, and keeping the temperature for 30-45min; then heating the blank to 1190 to 1210 ℃, and preserving the heat for 25 to 35min;
the purpose of the heat treatment in step S3 of the present invention is: heating the blank to 1190-1210 ℃ for heat preservation to ensure that the ferrite (alpha) tissue in the internal tissue reaches about 60 percent, and the plasticity of the blank is better when the proportion is higher.
And step S4, a rolling forming procedure, namely feeding the heated continuous casting billets into a rolling mill for rolling, and rolling the continuous casting billets into the twisted steel bars with different sizes through a 6-frame roughing mill and a 12-frame medium rolling mill in the rolling process.
To better test the properties of the Nb-containing duplex stainless-threaded steel bars produced according to the present invention, two sets of examples of tests were performed on the produced steel bars and a control example was added, specifically as follows:
the first embodiment is as follows: in this example, a 180mm square billet of S32304 in which Nb is contained in an amount of 0.15 to 0.30% by weight is rolled to form a duplex stainless steel twisted steel having a nominal diameter of 30.
The smelting process of the S32304 raw material and the molten steel is the same as that of the conventional duplex stainless steel S32304, except that the refining link of the AOD furnace is adopted, and 110kg of ferrocolumbium is added in the link to obtain the molten steel with the Nb content of 0.194 percent. And then continuously casting the qualified molten steel into 180mm square billets through a tundish and a crystallizer.
And (3) carrying out heat treatment on the continuous casting billet, feeding the continuous casting billet into a walking beam type heating furnace to heat, spending 55min to 1055 ℃, then spending 49min to 1177 ℃, keeping the temperature for 35min, then spending 21min to heat the continuous casting billet to 1205 ℃, and then keeping the temperature for 30min.
And then feeding the heated continuous casting slab into a rolling mill for rolling, and passing through a 6-frame roughing mill and a 12-frame medium rolling mill, wherein cooling and cooling are not required to be controlled in the rolling process, so that the duplex stainless steel bar with the nominal diameter of 30 and the yield strength of 576MPa is finally obtained.
The composition of the obtained duplex stainless steel twisted steel is as follows: c:0.021%; si:0.36 percent; mn:1.00 percent; p:0.0253%; s:0.0010%; cr:23.15 percent; ni:3.62 percent; mo:0.18 percent; n:0.096%; nb:0.194 percent; the balance of iron.
The experimental test results are as follows: the tensile strength is 756N/mm2, the yield strength is 576N/mm2, the elongation after fracture is 34.0 percent, and the maximum force total elongation is 22.1 percent.
The second embodiment: in this example, a 180mm square billet of S32304 containing 0.15 to 0.30% by weight of Nb is rolled to form a duplex stainless steel twisted bar having a nominal diameter of 25.
The smelting process of the S32304 raw material and the molten steel is the same as that of the conventional duplex stainless steel S32304, except that the refining link of the AOD furnace is adopted, and 120kg of ferrocolumbium is added in the link to obtain the molten steel with the Nb content of 0.195 percent. And then, continuously casting the qualified molten steel into 180mm square billets through a tundish and a crystallizer.
And (3) carrying out heat treatment on the continuous casting billet, feeding the continuous casting billet into a walking beam type heating furnace for heating, spending 51min to heat the continuous casting billet to 1052 ℃, then spending 50min to heat the continuous casting billet to 1178 ℃, keeping the temperature for 36min, then spending 23min to heat the continuous casting billet to 1206 ℃, and then keeping the temperature for 30min.
And then feeding the heated continuous casting billet into a rolling mill for rolling, and passing through a 6-frame roughing mill and a 12-frame medium rolling mill, wherein cooling is not required to be controlled in the rolling process, so that the duplex stainless steel bar with the nominal diameter of 25 and the yield strength of 565MPa is finally obtained.
The composition of the obtained duplex stainless steel twisted steel is as follows: c:0.028%; si:0.36 percent; mn:0.96 percent; p:0.0238 percent; s:0.0010%; cr:22.95 percent; ni:3.63 percent; mo:0.18 percent; n:0.087 percent; nb:0.195%; the balance of iron.
The experimental test results are as follows: the tensile strength is 738N/mm < 2 >, the yield strength is 565N/mm < 2 >, the elongation after fracture is 32.3%, and the maximum total force elongation is 21.5%.
Comparative example: this comparative example is illustrated by taking a 180mm billet of S32304 without Nb followed by rolling a duplex stainless rebar of nominal diameter 25.
The smelting process of the S32304 raw material and the molten steel is the same as that of the conventional duplex stainless steel S32304, and ferroniobium is not added in the smelting process. And then continuously casting the qualified molten steel into 180mm square billets through a tundish and a crystallizer.
And (3) carrying out heat treatment on the continuous casting billet, conveying the continuous casting billet into a walking beam type heating furnace to heat, spending 49min to 1051 ℃, then spending 48min to 1176 ℃, keeping the temperature for 33min, then spending 25min to heat the continuous casting billet to 1208 ℃, and then keeping the temperature for 30min.
And then feeding the heated continuous casting slab into a rolling mill for rolling, controlling cooling by waiting for 2-3 minutes before a 15 th rolling mill in the rolling process through a 6-frame roughing mill and a 12-frame middle rolling mill, and reducing the temperature of a rolled material to be below 950 ℃ to obtain the duplex stainless steel bar with the yield strength of more than or equal to 520MPa, wherein the yield strength of the sampling is 535MPa.
The composition of the obtained duplex stainless steel twisted steel is as follows: c:0.020%; si:0.34 percent; mn:0.95 percent; p:0.0262%; s:0.0010%; cr:23.15 percent; ni:3.70 percent; mo:0.21%; n:0.092%; the balance of iron.
The experimental test results are as follows: the tensile strength is 701N/mm < 2 >, the yield strength is 535N/mm < 2 >, the elongation after fracture is 34.2%, and the maximum total force elongation is 23.6%.
And (4) conclusion: comparing the experimental results of the first embodiment with the second embodiment to obtain that all indexes of the first embodiment are similar to those of the second embodiment, adding Nb with the weight percentage of 0.15-0.30% into S32304 binocular steel, and performing the working procedures of preheating, heating, soaking and the like to ensure that the prepared Nb-containing duplex stainless thread reinforcing steel bar material has stable property and can reach the tensile strength and the yield strength which meet the requirements;
by comparing the experimental results of the second embodiment with those of the comparative embodiment, the experimental indexes of the steel bars can be close to those of the second embodiment only after additional temperature control is added in the rolling process in the comparative embodiment, which shows that the second embodiment has simpler process and higher efficiency compared with the comparative embodiment, and the second embodiment can avoid that the yield strength does not meet the standard due to improper control of the rolling process in the comparative embodiment and can also reduce the rejection rate.
According to the technical scheme, a proper amount of Nb is added into S32304 duplex stainless steel, and the manufacturing method comprises the process flows of EAF furnace smelting, AOD furnace smelting, LF furnace smelting, continuous casting production of 180mm square billets, continuous casting billet heat treatment, and adopting a continuous rolling mill to roll the deformed steel bar, so that the qualified duplex stainless steel product with the yield strength of more than or equal to 520MPa can be rolled, the yield strength after the deformed steel bar is rolled can be improved, and waste products caused by the fact that the yield strength does not meet the standard due to improper control of the rolling process can be avoided. Meanwhile, because the temperature control procedure of the rolling procedure is reduced, the production efficiency can be improved, the cost consumed by adjusting the process in the rolling process is reduced, and cost reduction and efficiency improvement are facilitated.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (8)
1. The utility model provides a contain niobium diphase stainless steel twisted steel which characterized in that: the duplex stainless thread reinforcing steel bar comprises the following components in percentage by weight: less than or equal to 0.030 percent of C, less than or equal to 1.0 percent of Si, less than or equal to 2.5 percent of Mn, less than or equal to 0.030 percent of S, less than or equal to 0.040 percent of P, and the weight percentage of Cr:21.5 to 24.5 percent, ni:3.0 to 5.5%, mo:0.05 to 0.6%, N:0.05 to 0.20%, cu:0.05 to 0.6%, nb:0.15 to 0.30 percent, and the balance of iron and inevitable impurities.
2. A method of manufacturing a niobium-containing duplex stainless-threaded steel bar as claimed in claim 1, comprising the steps of:
s1, preparing molten steel: adding a dual-phase steel raw material and 0.15-0.30 wt% of Nb into a steelmaking furnace, refining and fully mixing to prepare dual-phase steel molten steel;
s2, preforming: continuously casting the molten steel prepared in the step S1 into a blank through a tundish and a crystallizer;
s3, heat treatment: sequentially carrying out preheating, heating and soaking processes on the blank obtained by the pre-forming of the S2;
s4, rolling and forming: and (4) feeding the blanks heated in the step (3) into a rolling mill to be rolled into the twisted steel.
3. The method for manufacturing a niobium-containing duplex stainless-threaded steel bar as claimed in claim 2, wherein: the preparing of the molten steel in the step S1 includes: firstly, putting a dual-phase steel raw material into an EAF furnace for melting and smelting to obtain dual-phase steel molten steel; then transferring the dual-phase steel molten steel in the EAF furnace to an AOD furnace, adding a proper amount of ferronickel into the molten steel in the AOD furnace to obtain Nb-containing molten steel with the weight percentage of 0.15-0.30%; and finally, putting the refined molten steel in the AOD furnace into an LF furnace for smelting to obtain purer molten steel.
4. The method for manufacturing a niobium-containing duplex stainless-threaded steel bar as claimed in claim 2, wherein: and in the step S2, the molten steel prepared in the step S1 is continuously cast into a square billet with the thickness of 180mm through a tundish and a crystallizer.
5. The method for manufacturing a niobium-containing duplex stainless-threaded steel bar as claimed in claim 2, wherein: the heat treatment in step S3 includes:
rapidly preheating the blank to over 1000 ℃;
then heating the blank to 1140 to 1160 ℃, and keeping the temperature for no more than 60min;
then soaking the blank to 1190 to 1210 ℃ and keeping the temperature for not more than 60min.
6. The method for manufacturing a niobium-containing duplex stainless-threaded steel bar as claimed in claim 5, wherein: heating the blank to 1140-1160 ℃, and keeping the temperature for 30-45min; soaking the blank at 1190 to 1210 ℃ and keeping the temperature for 25 to 35min.
7. The method for manufacturing a niobium-containing duplex stainless-threaded steel bar as claimed in claim 5, wherein: the heating time of preheating and heating does not exceed 60min, and the heating time of soaking does not exceed 40min.
8. The method for manufacturing a niobium-containing duplex stainless-threaded steel bar as claimed in claim 2, wherein: the heat treatment in step S3 is performed in a walking beam furnace.
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| CN115725811A (en) * | 2022-12-16 | 2023-03-03 | 浙江青山钢铁有限公司 | Production method of second-generation duplex stainless steel wire |
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