CN107815601B - Microalloy construction steel wire rod containing Nb and Cr and LF furnace production method thereof - Google Patents
Microalloy construction steel wire rod containing Nb and Cr and LF furnace production method thereof Download PDFInfo
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- CN107815601B CN107815601B CN201711239934.0A CN201711239934A CN107815601B CN 107815601 B CN107815601 B CN 107815601B CN 201711239934 A CN201711239934 A CN 201711239934A CN 107815601 B CN107815601 B CN 107815601B
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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
- 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
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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
- C21D8/065—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires of ferrous alloys
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/06—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
- 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
- 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
- C22C38/26—Ferrous alloys, e.g. steel alloys containing chromium with niobium or tantalum
Abstract
The invention belongs to the field of ferrous metallurgy, and particularly relates to a microalloy construction steel wire rod containing Nb and Cr and a production method of an LF (ladle furnace) thereof. Aiming at the problems of low nitrogen content, few varieties and the like of vanadium nitride alloy selected for preparing nitrogen-containing alloy steel in the prior art, the invention provides a microalloy construction steel wire rod containing Nb and Cr and a production method of an LF furnace of the microalloy construction steel wire rod. The wire rod comprises the following components: c, according to weight percentage: 0.15% -0.30%, Si: 0.30% -1.00%, Mn: 0.60% -1.30%, N: 0.0060-0.0180%, P is less than or equal to 0.040%, S is less than or equal to 0.040%, Nb: 0.010-0.050%, Cr: 0.10 to 0.60 percent, and the balance of Fe and inevitable impurities. The key of the preparation method is that N-containing core-spun yarns are fed into an LF furnace, and N is adjusted to a proper level. The method has the advantages of simple operation, high and stable nitrogen yield, effective reduction of production cost and worth of popularization and application.
Description
Technical Field
The invention belongs to the field of ferrous metallurgy, and particularly relates to a microalloy construction steel wire rod containing Nb and Cr and a production method of an LF (ladle furnace) thereof.
Background
The microalloyed steel mainly refers to steel which can obviously improve the performance by adding a small amount or trace of certain element into the steel, and particularly improves the strength index of the steel. Microalloyed steels are typically obtained with very small or minimal additions of vanadium, niobium and titanium under prior art conditions. The action mechanism of microalloying is as follows: after vanadium, niobium and titanium as trace elements are added into molten steel, they are combined with carbon and nitrogen in the molten steel to form compound particles of carbon and nitrogen, i.e. V (C, N), Nb (C, N) and Ti (C, N), and these particles have a certain action of precipitation strengthening and grain refining, so that the strength of steel can be obviously raised.
Therefore, the effect of vanadium, niobium and titanium in microalloy steel is practically not separated from nitrogen, but steel is smelted by a converter under the general condition, the content of residual nitrogen is within the range of 0.0030-0.065%, and steel is smelted by an electric furnace, the content of residual nitrogen is within the range of 0.050-0.085%, and in most cases, if the effect of vanadium, niobium and titanium is fully exerted, the effect can be realized by adding additional nitrogen element.
In the early stage, nitrogen is added into the microalloy steel by adding 3 to 6 percent of nitriding alloy, but the nitriding alloy contains very low nitrogen, so that the alloy has large addition amount and unstable yield and is gradually replaced by vanadium nitride alloy with higher nitrogen content. At present, 3 to 6 percent of nitriding alloy is difficult to reuse in the production of microalloy steel, and vanadium nitride alloy containing vanadium and high nitrogen content is almost used completely. The vanadium nitride alloy mainly has three grades of VN12, VN14 and VN 16. Generally, the ratio of nitrogen to vanadium of the three grades is basically fixed and is respectively 12: 78, 14: 78 and 16: 78, namely the ratio of nitrogen to vanadium is 16: 78 of VN16 at most, namely the alloy contains 16% of N and 78% of vanadium. Vanadium nitride alloys, although containing both vanadium and nitrogen, are not satisfactory for different microalloying routes in microalloyed steel, especially for composite microalloyed steel, such as V-Ti-N, and even V-Ti-Nb-N.
Disclosure of Invention
Aiming at the problems of low nitrogen content, few varieties and the like of vanadium nitride alloy selected by the existing preparation of nitrogen-containing alloy steel, the invention provides a novel method for preparing nitrogen-containing alloy. The method adopts the nitrogen-containing core-spun yarn to adjust the nitrogen content in the microalloy, can more accurately control the N content in the steel, and has high nitrogen yield and low cost of the prepared microalloy steel.
The invention aims to solve the first technical problem of providing a microalloy construction steel wire rod containing Nb and Cr. The microalloy construction steel wire rod containing Nb and Cr comprises the following chemical components: c, according to weight percentage: 0.15% -0.30%, Si: 0.30% -1.00%, Mn: 0.60% -1.30%, N: 0.0060-0.0180%, P is less than or equal to 0.040%, S is less than or equal to 0.040%, Nb: 0.010-0.050%, Cr: 0.10 to 0.60 percent, and the balance of Fe and inevitable impurities.
The invention also provides a production method of the LF furnace containing the Nb-Cr microalloy construction steel wire rod. The production method of the LF furnace comprises the following steps:
smelting blast furnace molten iron in a converter, refining in an LF furnace, and continuously casting to obtain a steel billet; heating the billet, rolling the billet into a material by a high-speed wire rod rolling mill, and cooling the material to prepare a round rod wire rod or a thread wire rod; feeding a core-spun yarn into a ladle to adjust the N content after refining in an LF furnace; the steel billet comprises the following components in percentage by weight: 0.15% -0.30%, Si: 0.30% -1.00%, Mn: 0.60% -1.30%, N: 0.0060-0.0180%, P is less than or equal to 0.040%, S is less than or equal to 0.040%, Nb: 0.010-0.050%, Cr: 0.10 to 0.60 percent, and the balance of Fe and inevitable impurities; the heating temperature of the steel billet is controlled to be 950-1220 ℃, the soaking temperature is controlled to be 1000-1200 ℃, and the total time of heating and soaking is 90-120 min; in the working procedure of a wire laying machine in the high-speed wire rolling mill, the wire laying temperature is controlled to be 880-960 ℃; the cooling is to cool the steel plate to 600-700 ℃ at a cooling speed of 4-8 ℃/s, then cool the steel plate to 400-500 ℃ at a cooling speed of 2-3 ℃/s, and finally cool the steel plate to 150-300 ℃ at a cooling speed of 0.5-1.0 ℃/s.
Further, the LF furnace production method of the Nb-Cr-containing microalloy construction steel wire rod comprises the following steps:
a. smelting in a converter: adding molten iron and scrap steel into a converter, carrying out oxygen blowing and decarburization by using the converter, and carrying out smelting, wherein steel is tapped when the content of C in the molten steel is 0.05-0.15%, the content of P is less than or equal to 0.025%, the content of S is less than or equal to 0.035%, and the temperature of the molten steel is greater than or equal to 1650 ℃;
when steel is tapped from 1/3-2/3, FeSi, FeMn, FeCr and FeNb alloys and a C increasing agent are added, and the content of C is controlled to be 0.15-0.30%, the content of Si is 0.30-1.00%, the content of Mn is 0.60-1.30%, the content of Cr is 0.10-0.60%, and the content of Nb is 0.010-0.050%;
b. feeding core-spun yarns: transferring the steel ladle to a steel ladle after tapping, and blowing inert gas into the steel ladle after the steel ladle reaches a small platform behind the furnace; after the steel ladle reaches the LF furnace, adding an N-containing core-spun yarn, and controlling the N content in the molten steel to be 0.0060-0.0180%;
c. continuous casting: controlling the superheat degree of a continuous casting machine to be 20-50 ℃, continuously casting molten steel into a square billet with a billet section of 150mm multiplied by 150 mm-200 mm multiplied by 200mm, and air-cooling to room temperature;
d. heating and rolling a steel billet: controlling the heating temperature of a steel billet to be 950-1220 ℃, controlling the soaking temperature to be 1000-1200 ℃, controlling the total heating and soaking time to be 90-120 min, rolling the steel billet into a round rod wire rod or a thread wire rod by adopting a high-speed wire rod rolling mill, and cooling after rolling to obtain a product; in the wire laying machine procedure in the high-speed wire rolling mill, the wire laying temperature is controlled to be 880-960 ℃; the cooling is to cool the steel plate to 600-700 ℃ at a cooling speed of 4-8 ℃/s, then cool the steel plate to 400-500 ℃ at a cooling speed of 2-3 ℃/s, and finally cool the steel plate to 150-300 ℃ at a cooling speed of 0.5-1.0 ℃/s.
In the LF furnace production method of the Nb-Cr-containing microalloy construction steel wire rod, the molten iron in the step a is required to have the S content less than or equal to 0.06%.
In the LF furnace production method of the Nb and Cr containing microalloy construction steel wire rod, the FeSi and FeMn alloy in the step a is replaced by FeSiMn alloy.
In the LF furnace production method of the Nb and Cr containing microalloy construction steel wire rod, the inert gas in the step b is at least one of argon or nitrogen.
In the LF furnace production method of the Nb and Cr containing microalloy construction steel wire rod, the inert gas is blown in the step b for more than or equal to 2 min.
In the LF furnace production method of the Nb and Cr containing microalloy construction steel wire rod, the electric heating temperature in the step b is 60-90 ℃ higher than the liquidus temperature.
In the LF furnace production method of the Nb-Cr-containing microalloy construction steel wire rod, the specification of the round rod wire rod or the threaded wire rod in the step d is
The invention designs microalloy construction steel containing Nb and Cr, wherein the steel is added with alloy components of Nb: 0.010-0.050%, Cr: 0.10 to 0.60 percent, adjusting the content of N in the steel by feeding N-containing cored wires into a steel ladle after refining in an LF furnace, controlling proper parameters such as spinning temperature, cooling rate and the like by adopting a high-speed wire rolling production line for rolling, and finally preparing the Nb-and Cr-containing microalloy building steel with high strength and high nitrogen yield and excellent performance. The method has the advantages of simple operation, high and stable nitrogen yield, effective reduction of production cost and worth of popularization and application.
Detailed Description
The invention provides a microalloy construction steel wire rod containing Nb and Cr, which comprises the following chemical components: c, according to weight percentage: 0.15% -0.30%, Si: 0.30% -1.00%, Mn: 0.60% -1.30%, N: 0.0060-0.0180%, P is less than or equal to 0.040%, S is less than or equal to 0.040%, Nb: 0.010-0.050%, Cr: 0.10 to 0.60 percent, and the balance of Fe and inevitable impurities.
In the chemical components, the steel contains 0.0060-0.0180% of nitrogen, and is fixed by adopting 0.010-0.050% of Nb, so that the aging performance of the steel is ensured. In general, steel is smelted by a converter, the content of residual nitrogen in the final finished steel is within the range of 0.0030-0.0065%, and the content of residual nitrogen is within the range of 0.0050-0.0085% by electric furnace smelting. The high nitrogen content in the steel causes the aging performance to be deteriorated, therefore, when the nitrogen content is higher than 0.006 percent, and with the increase of the nitrogen content, a proper amount of nitrogen fixing elements must be added for fixation, and the invention adopts a mode of adding 0.010 to 0.050 percent of Nb to ensure the aging performance of the steel and simultaneously can fully play the solid solution strengthening role of nitrogen, thereby improving the strength of the steel and reducing the alloy cost of the steel.
In addition, in the chemical components, because the content of nitrogen in molten steel is higher than that of residual nitrogen in common steel, Nb (C, N) particles are more easily formed by adding niobium, so that the precipitation of niobium is promoted, the precipitation strengthening and grain refining effects of niobium can be more fully exerted, and the comprehensive mechanical property of the steel is improved.
The Nb is added to ensure the mechanical property, the N is added to improve the property and fully play the strengthening role of the Nb so as to reduce the alloying cost of the Nb, and the adding amount of the Nb can be reduced after the N is added. And Cr is added to improve corrosion resistance.
In the chemical components, 0.10-0.60% of Cr is a main element for improving the hardenability of the steel, and a compact rust layer is formed on the surface of the steel base, so that the corrosion of atmosphere or other corrosive media to the weather-resistant steel base body is slowed down, and the weather resistance of the weather-resistant steel is improved. Therefore, the addition of 0.10-0.60% of Cr has two beneficial effects on the construction steel, firstly, the addition of 0.10-0.60% of Cr can make the grain size of the central part of the large-size construction steel consistent with that of the edge part, and secondly, the addition of 0.10-0.60% of Cr to the construction steel makes the amount of weight loss caused by corrosion of air less than that of the construction steel without Cr even if the steel is stored in an open environment for a long time.
The invention also provides a process for preparing the Nb-Cr microalloy constructional steel wire rod converter, which comprises the following steps: converter smelting → LF refining + feeding core-spun yarn → continuous casting to form billet → billet heating → rolling to form material on the high-speed wire rolling production line. The converter process technology of the invention is described in detail below:
the first step is as follows: smelting in a converter
Firstly, adding molten iron and scrap steel into a converter, wherein the S content of the added molten iron is required to be not more than 0.060%; after molten iron and steel scrap are added into a converter, primarily smelting the molten iron and the steel scrap into molten steel by utilizing the oxygen blowing and decarburization functions of the converter, and tapping into a steel ladle when the molten steel components are primarily smelted to 0.05-0.15 percent of C, P not more than 0.025 percent and S not more than 0.035 percent, and the tapping temperature is not lower than 1650 ℃;
adding FeSi alloy containing Si element, FeMn alloy containing Mn element, FeCr alloy containing Cr element, alloy containing Nb element, carbon powder or anthracite and other C increasing agents in the tapping process, controlling C to be within the range of 0.15-0.30%, controlling Si to be within the range of 0.30-1.00%, controlling Mn to be within the range of 0.60-1.30%, controlling Cr to be within the range of 0.10-0.60%, and controlling Nb to be within the range of 0.010-0.050%; in addition, the C increasing agents such as FeSi, FeMn, FeCr, FeNb alloy, carbon powder or anthracite and the like are added when the steel is tapped at 1/3, and the C increasing agents are required to be added when the steel is tapped to 2/3;
in addition to the above alloy, FeSiMn alloy containing Si and Mn may be used instead of FeSi and FeMn alloy.
The second step is that: blowing inert gas into the rear of the converter
And after tapping is finished, immediately connecting the steel ladle into a pipeline, blowing inert gas into the molten steel in the steel ladle, wherein the blown inert gas can be argon or nitrogen, and the time for blowing the inert gas is not less than 2 min. The blowing time of the inert gas is regulated to be not less than 2min so as to ensure that the molten steel has enough cycle time and various added alloys can be fully melted and uniform.
The third step: LF furnace heating
And after the ladle reaches the LF furnace, performing electric heating, wherein the control range of the electric heating temperature is 60-90 ℃ higher than the liquidus temperature, sampling to detect the N content in the molten steel after the required temperature is reached, then adding the N-containing core-spun yarn by adopting a yarn feeding method according to the detection result of the N content in the molten steel, controlling the N content in the molten steel to be within the range of 0.0060-0.0180%, and if the N content in the molten steel is stably controlled after the LF furnace is heated, directly feeding the core-spun yarn without sampling to detect the N content. The cored wire is a nitrogen-containing alloy, such as SiN.
Before feeding the core-spun yarn, the steel ladle needs to be connected with a pipeline blown with inert gas again, the core-spun yarn containing N can be fed after the inert gas is blown in, the inert gas can be argon or nitrogen, and the time for blowing in the inert gas after the yarn feeding is finished needs to be prolonged by 2min so as to ensure the uniformity of the N element in the molten steel.
The fourth step: continuously casting into steel billet
The superheat degree of a continuous casting machine is controlled to be 20-50 ℃, and the temperature is realized by controlling the tapping temperature of the converter and the post-furnace outlet temperature.
The section of the billet continuously cast by the molten steel is 150mm multiplied by 150 mm-200 mm multiplied by 200mm, the section of the billet which is lower than 150mm multiplied by 150mm is small, which is not beneficial to the continuous operation of the converter process, and the section of the billet which is larger than 200mm multiplied by 200mm can prolong the heating time when the billet is subsequently rolled.
The steel billet continuously cast by the molten steel is naturally cooled to the room temperature in the air.
The fifth step: heating and rolling of billets
The heating of the steel billet requires that the total heating time is 90-120 min, the heating temperature of the steel billet is controlled to be 950-1220 ℃, and the soaking temperature is controlled to be 1000-1200 ℃.
Parameters such as rough rolling temperature, finish rolling inlet temperature, finish rolling outlet temperature, deformation, rolling pass number and the like in the rolling process of the high-speed wire rod rolling mill can be set by adopting a conventional technology according to equipment conditions and rolling speed, but the spinning process of a final spinning machine needs to be ensured, and the spinning temperature of the spun round bar coil rod steel or ribbed steel bar coil rod steel is controlled within the range of 880-960 ℃.
After the wire is spun by the wire-laying machine, the round bar wire rod steel or the ribbed steel bar wire rod steel is firstly cooled to 600-700 ℃ at a cooling speed of 4-8 ℃/s, then cooled to 400-500 ℃ at a cooling speed of 2-3 ℃/s, finally cooled to 150-300 ℃ at a cooling speed of 0.5-1.0 ℃/s, collected and coiled, and finally bundled by steel belts or steel wires to form the finished product wire rod steel convenient for transportation and sale.
Finally, the special description is as follows: final diameter is
Or a rod having a diameter of the ribbed steel bar of GB1499.2
The steel wire rod for the building can be rolled by adopting a high-speed wire rod rolling mill.
The following examples are intended to illustrate specific embodiments of the present invention without limiting the scope of the invention to the examples.
Example 1
The technology is adopted to produce the ribbed steel bar for the building in the process of a converter with the nominal capacity of 120 tons (the actual steel tapping amount is within the range of 120-140 tons) in a certain iron and steel plant, and the production process comprises the steps of converter smelting → inert gas blowing behind the converter → LF furnace heating → 6 machine 6 flow square billet continuous casting machine casting into a 150mm multiplied by 150mm billet → billet heating → steel billet rolling into a high-speed wire rod
Round bar steel bar.
Firstly, 120 tons of molten iron and 20 tons of scrap steel are added into a converter, and the S content of the added molten iron is less than 0.060 percent. After molten iron and waste steel are added into a converter, the molten iron and the waste steel are primarily smelted into molten steel by utilizing the oxygen blowing and C removing function of the converter, when the molten steel is primarily smelted to 0.09% of C, 0.022% of P and 0.026% of S, and the temperature is 1674 ℃, steel is tapped into a steel ladle, and the actual tapping amount is 132 tons (about 5% of raw materials are burnt and damaged in the converter smelting process). FeSi, FeMn, FeCr, FeNb alloy and anthracite are added into molten steel in the tapping process to carry out Si, Mn, Cr, Nb and C element alloying, wherein the content of Si in the added FeSi alloy is 74%, the content of Mn in the FeMn alloy is 82%, the content of Cr in the FeCr alloy is 54%, the content of Nb in the FeNb alloy is 65%, the content of fixed C in the anthracite is 92%, the content of Si in molten steel is controlled to be 0.27%, the content of Mn in the molten steel is 0.61%, the content of Cr in the molten steel is 0.10%, the content of Nb in the molten steel is 0.010%, and the content of C in the molten steel is 0.16%.
And after the molten steel reaches a small platform behind the furnace, immediately connecting a steel ladle into the pipeline, blowing nitrogen into the molten steel in the steel ladle for 4-5 min, and fully melting and uniformly adding various alloys.
And (3) electrically heating the molten steel after the molten steel reaches the LF furnace, and adding the N-containing core-spun yarn by adopting a yarn feeding method when the temperature of the molten steel reaches 1577 ℃, wherein the N content in the molten steel is controlled to be 0.0061%. Before feeding the core-spun yarn, the steel ladle needs to be connected with a pipeline for blowing inert gas again, nitrogen is blown in, and the time for blowing the nitrogen is prolonged for 2min after the yarn feeding is finished so as to ensure the uniformity of the N element in the molten steel. And then sending the molten steel to a continuous casting machine for casting.
Casting the steel billet into a 150mm multiplied by 150mm billet on a 6-machine 6-flow billet caster, wherein the temperature of a tundish during continuous casting is 1546 ℃, the liquidus temperature of steel is 1515 ℃, and the chemical components of molten steel sampled and analyzed in the caster comprise 0.16% of C, 0.31% of Si, 0.62% of Mn, 0.10% of Cr, 0.010% of Nb, 0.027% of P, 0.022% of S and 0.0064% of N, and the balance of Fe and inevitable other impurities. And stacking the casting blanks and naturally cooling to room temperature.
Cooling the casting blank and then sending the casting blank to a high-speed wire rod for rollingThe production line is heated and rolled, and the rolling specification isThe ribbed steel bar. The heating temperature of the casting blank is 959 ℃, the soaking temperature is 1007 ℃, and the casting blank is taken out of the furnace for rolling after the total heating time reaches 118 min.
In the rolling of the high-speed wire rod mill, parameters such as rough rolling temperature and finish rolling temperature are correspondingly adjusted by taking the final adjustment of the spinning temperature to 880 ℃.
After the wire is spun by the wire-laying machine, the round bar wire rod steel or the ribbed steel bar wire rod steel is cooled to 605 ℃ at a cooling speed of 4 ℃/s, then cooled to 400 ℃ at a cooling speed of 2 ℃/s, finally cooled to 150 ℃ at a cooling speed of 1.0 ℃/s, collected and coiled, and finally bundled by steel belts or steel wires into finished product wire rod steel convenient for transportation and sale.
The mechanical property test result of the steel is as follows: the ReL (Rp0.2) is 352MPa, the tensile strength is 483MPa, the elongation is 36.2 percent, the maximum total elongation is 18.1 percent, the cold bending at 180 ℃ is qualified, and the tissues of the steel are ferrite and pearlite.
The chemical components of the prepared comparative steel which is prepared by the same preparation process are 0.16 percent of C, 0.32 percent of Si, 0.61 percent of Mn, 0.010 percent of Nb, 0.026 percent of P, 0.020 percent of S, 0.0064 percent of N, 0.03 percent of Cr and the balance of Fe and other inevitable impurities, and the specification is that
Ribbed steel bar. The mechanical properties of the comparative steel are tested as follows: the ReL (Rp0.2) is 346MPa, the tensile strength is 478MPa, the elongation is 35.9 percent, the maximum total elongation is 18.1 percent, the cold bending at 180 ℃ is qualified, and the tissues of the steel are ferrite and pearlite.
The comparative steel and the inventive steel were subjected to a corrosion test under the conditions of Table 1, and the average weight loss ratio of the inventive steel was 2.511g/m2The average weight loss ratio of the comparative steel was 2.432g/m2The relative corrosion rate of the steel of the invention relative to the comparative steel is 96.9%, and a corrosion test shows that the steel of the invention has certain corrosion resistance.
TABLE 1 results of the examination of corrosion resistance
Example 2
The technology is adopted to produce the ribbed steel bar for the building in the process of a converter with the nominal capacity of 120 tons (the actual steel tapping amount is within the range of 120-140 tons) in a certain iron and steel plant, and the production process comprises the steps of converter smelting → inert gas blowing in after the converter → LF furnace heating → machine adding 6-flow square billet continuous casting machine casting into a 150mm multiplied by 150mm billet → billet heating → high-speed wire rolling into a 150mm multiplied by 150mm billet
Ribbed steel bar.
Firstly, 120 tons of molten iron and 20 tons of scrap steel are added into a converter, and the S content of the added molten iron is less than 0.060 percent. After molten iron and scrap steel are added into a converter, the molten iron and the scrap steel are primarily refined into molten steel by utilizing the oxygen blowing and decarburization function of the converter, when the molten steel components are primarily refined to 0.08 percent of C, 0.022 percent of P and 0.024 percent of S and the temperature is 1681 ℃, the molten steel is discharged into a ladle, and the actual steel discharge amount is 132 tons (about 5 percent of raw materials are burnt and damaged in the converter smelting process). FeSi, FeMn, FeCr, FeNb alloy and anthracite are added into molten steel in the tapping process to carry out Si, Mn, Cr, Nb and C element alloying, wherein the content of Si in the added FeSi alloy is 74%, the content of Mn in the FeMn alloy is 82%, the content of Cr in the FeCr alloy is 54%, the content of Nb in the FeNb alloy is 65%, the content of fixed C in the anthracite is 92%, the content of Si in the molten steel is controlled to be 0.93%, the content of Mn is 1.28%, the content of Cr is 0.30%, the content of Nb is 0.050%, and the content of C is 0.30%.
And after the molten steel reaches a small platform behind the furnace, immediately connecting a steel ladle into the pipeline, blowing nitrogen into the molten steel in the steel ladle for 4-5 min, and fully melting and uniformly adding various alloys.
And (3) electrically heating the molten steel after the molten steel reaches the LF furnace, and adding the N-containing cored wire by adopting a wire feeding method when the temperature of the molten steel reaches 1579 ℃, wherein the N content in the molten steel is controlled to be 0.0170%. Before feeding the core-spun yarn, the steel ladle needs to be connected with a pipeline for blowing inert gas again, nitrogen is blown in, and the time for blowing the nitrogen is prolonged for 2min after the yarn feeding is finished so as to ensure the uniformity of the N element in the molten steel. And then sending the molten steel to a continuous casting machine for casting.
The casting is cast into a 150mm multiplied by 150mm casting blank on a 6 machine 6 flow billet caster, the temperature of a tundish during continuous casting is 1526 ℃, the liquidus temperature of steel is 1495 ℃, and the chemical components of molten steel are sampled and analyzed in the caster to be 0.30% of C, 1.00% of Si, 1.28% of Mn, 0.29% of Cr, 0.050% of Nb, 0.027% of P, 0.016% of S and 0.0177% of N, and the balance is Fe and inevitable other impurities. And stacking the casting blanks and naturally cooling to room temperature.
Cooling the casting blank, and then conveying the casting blank to a high-speed wire rod rolling production line for heating and rolling, wherein the rolling specification isThe ribbed steel bar. The heating temperature of the casting blank is 959 ℃, the soaking temperature is 1006 ℃, and the casting blank is taken out of the furnace for rolling after the total heating time reaches 115 min.
In the rolling of the high-speed wire rod mill, parameters such as rough rolling temperature and finish rolling temperature are correspondingly adjusted by taking the final adjustment of the spinning temperature to 880 ℃.
After the wire is spun by the wire-laying machine, the round bar wire rod steel or the ribbed steel bar wire rod steel is cooled to 605 ℃ at a cooling speed of 4 ℃/s, then cooled to 400 ℃ at a cooling speed of 2 ℃/s, finally cooled to 150 ℃ at a cooling speed of 1.0 ℃/s, collected and coiled, and finally bundled by steel belts or steel wires into finished product wire rod steel convenient for transportation and sale.
The mechanical property test result of the steel is as follows: the ReL (Rp0.2) is 540MPa, the tensile strength is 701MPa, the elongation is 18.1 percent, the maximum force total elongation is 11.4 percent, and the cold bending at 180 ℃ is qualified. The structure of the steel is ferrite plus pearlite.
The chemical components of the prepared comparative steel which is prepared by the same preparation process are 0.29 percent of C, 0.97 percent of Si, 1.30 percent of Mn, 0.049 percent of Nb, 0.022 percent of P, 0.018 percent of S, 0.0178 percent of N, 0.03 percent of Cr and the balance of Fe and other inevitable impurities, and the specification is thatRibbed steel bar. The mechanical properties of the comparative steel are tested as follows: the ReL (Rp0.2) is 504MPa, the tensile strength is 682MPa, the elongation is 18.8 percent, the maximum total elongation is 11.1 percent, the cold bending at 180 ℃ is qualified, and the tissues of the steel are ferrite and pearlite.
The comparative steel and the inventive steel were subjected to corrosion tests under the conditions of Table 2, and the average weight loss ratio of the inventive steel was 2.507g/m2The average weight loss of the comparative steel was 2.374g/m2The relative corrosion rate of the steel of the invention relative to the comparative steel is 94.7%, and a corrosion test shows that the steel of the invention has certain corrosion resistance.
TABLE 2 results of the examination of corrosion resistance
Example 3
The technology is adopted to produce the ribbed steel bar for the building in the process of a converter with the nominal capacity of 120 tons (the actual steel tapping amount is within the range of 120-140 tons) in a certain iron and steel plant, and the production process comprises the steps of converter smelting → inert gas blowing in after the converter → LF furnace heating → machine adding 6-flow square billet continuous casting machine casting into a 150mm multiplied by 150mm billet → billet heating → high-speed wire rolling into a 150mm multiplied by 150mm billet
Ribbed steel bar.
Firstly, 120 tons of molten iron and 20 tons of scrap steel are added into a converter, and the S content of the added molten iron is less than 0.060 percent. After molten iron and scrap steel are added into a converter, the molten iron and the scrap steel are primarily smelted into molten steel by utilizing the oxygen blowing and decarburization function of the converter, when the molten steel components are primarily smelted to 0.12 percent of C, 0.020 percent of P and 0.023 percent of S, and the temperature is 1672 ℃, the molten steel is tapped into a ladle, and the actual tapping amount is 132 tons (about 5 percent of raw materials are burnt and damaged in the converter smelting process). FeSi, FeMn, FeCr, FeNb alloy and anthracite are added into molten steel in the tapping process to carry out Si, Mn, Cr, Nb and C element alloying, wherein the content of Si in the added FeSi alloy is 74%, the content of Mn in the FeMn alloy is 82%, the content of Cr in the FeCr alloy is 54%, the content of Nb in the FeNb alloy is 65%, the content of fixed C in the anthracite is 92%, the content of Si in molten steel is controlled to be 0.62%, the content of Mn is 0.97%, the content of Cr is 0.59%, the content of Nb is 0.025%, and the content of C is 0.22%.
And after the molten steel reaches a small platform behind the furnace, immediately connecting a steel ladle into the pipeline, blowing nitrogen into the molten steel in the steel ladle for 4-5 min, and fully melting and uniformly adding various alloys.
And (3) electrically heating the molten steel after the molten steel reaches the LF furnace, and adding the N-containing cored wire by adopting a wire feeding method when the temperature of the molten steel reaches 1584 ℃, wherein the N content in the molten steel is controlled to be 0.0125%. Before feeding the core-spun yarn, the steel ladle needs to be connected with a pipeline for blowing inert gas again, nitrogen is blown in, and the time for blowing the nitrogen is prolonged for 2min after the yarn feeding is finished so as to ensure the uniformity of the N element in the molten steel. And then sending the molten steel to a continuous casting machine for casting.
Casting the steel into a 150mm multiplied by 150mm billet on a 6-machine 6-flow billet caster, wherein the temperature of a tundish during continuous casting is 1538 ℃, the liquidus temperature of steel is 1505 ℃, and the chemical components of molten steel in the caster are sampled and analyzed to be 0.21 percent of C, 0.66 percent of Si, 1.01 percent of Mn, 0.60 percent of Cr, 0.025 percent of Nb, 0.027 percent of P, 0.021 percent of S and 0.0126 percent of N, and the balance of Fe and inevitable other impurities. And stacking the casting blanks and naturally cooling to room temperature.
Cooling the casting blank, and then conveying the casting blank to a high-speed wire rod rolling production line for heating and rolling, wherein the rolling specification is
The ribbed steel bar. The heating temperature of the casting blank is 1125 ℃, the soaking temperature is 1072 ℃, and the casting blank is discharged from the furnace for rolling after the total heating time reaches 98 min.
In the rolling of the high-speed wire rod mill, parameters such as rough rolling temperature and finish rolling temperature are correspondingly adjusted by taking the final adjustment of the spinning temperature to 880 ℃.
After the wire is spun by the wire-laying machine, the round bar wire rod steel or the ribbed steel bar wire rod steel is cooled to 605 ℃ at a cooling speed of 4 ℃/s, then cooled to 400 ℃ at a cooling speed of 2 ℃/s, finally cooled to 150 ℃ at a cooling speed of 1.0 ℃/s, collected and coiled, and finally bundled by steel belts or steel wires into finished product wire rod steel convenient for transportation and sale.
The mechanical property test result of the steel is as follows: the ReL (Rp0.2) is 469MPa, the tensile strength is 629MPa, the elongation is 22.1 percent, the maximum total elongation is 15.1 percent, and the cold bending at 180 ℃ is qualified. The structure of the steel is ferrite plus pearlite.
The chemical components of the prepared comparative steel which is prepared by the same preparation process are 0.23 percent of C, 0.63 percent of Si, 1.03 percent of Mn, 0.025 percent of Nb, 0.028 percent of P, 0.019 percent of S, 0.0121 percent of N, 0.03 percent of Cr and the balance of Fe and other inevitable impurities, and the specification is that
Ribbed steel bar. The mechanical properties of the comparative steel are tested as follows: the ReL (Rp0.2) is 429MPa, the tensile strength is 591MPa, the elongation is 21.2 percent, the maximum total elongation is 15.3 percent, the cold bending at 180 ℃ is qualified, and the tissues of the steel are ferrite and pearlite.
The comparative steel and the inventive steel were subjected to a corrosion test under the conditions of Table 3, and the average weight loss ratio of the inventive steel was 2.509g/m2The average weight loss of the comparative steel was 2.331g/m2The relative corrosion rate of the steel of the invention relative to the comparative steel is 92.9%, and a corrosion test shows that the steel of the invention has certain corrosion resistance.
TABLE 3 results of the examination of corrosion resistance
Example 4
The technology is adopted to produce the round bar steel bar for the building in the process of a converter with the nominal capacity of 120 tons (the actual steel tapping amount is within the range of 120-140 tons) in a certain iron and steel plant, and the production process comprises the steps of converter smelting → inert gas blowing behind the converter → LF furnace heating → machine adding 6-flow square billet continuous casting machine casting into a 150mm multiplied by 150mm steel billet → steel billet heating → high-speed wire rolling into a 150mm multiplied by 150mm steel billet
Round bar steel bar.
Firstly, 120 tons of molten iron and 20 tons of scrap steel are added into a converter, and the S content of the added molten iron is less than 0.060 percent. After molten iron and scrap are added into a converter, the molten iron and the scrap are primarily refined into molten steel by utilizing the oxygen blowing and decarburization function of the converter, when the molten steel components are primarily refined to 0.08 percent of C, 0.018 percent of P and 0.024 percent of S and the temperature is 1685 ℃, the molten steel is discharged into a ladle, and the actual steel discharge amount is 132 tons (about 5 percent of raw materials are burnt during the smelting process of the converter). FeSi, FeMn, FeCr, FeNb alloy and anthracite are added into molten steel in the tapping process to carry out Si, Mn, Cr, Nb and C element alloying, wherein the content of Si in the added FeSi alloy is 74%, the content of Mn in the FeMn alloy is 82%, the content of Cr in the FeCr alloy is 54%, the content of Nb in the FeNb alloy is 65%, the content of fixed C in the anthracite is 92%, the content of Si in molten steel is controlled to be 0.58%, the content of Mn is 0.87%, the content of Cr is 0.38%, the content of Nb is 0.015%, and the content of C is 0.19%.
And after the molten steel reaches a small platform behind the furnace, immediately connecting a steel ladle into the pipeline, blowing nitrogen into the molten steel in the steel ladle for 4-5 min, and fully melting and uniformly adding various alloys.
And (3) electrically heating the molten steel after the molten steel reaches the LF furnace, and adding the N-containing cored wire by adopting a wire feeding method when the temperature of the molten steel reaches 1581 ℃, wherein the N content in the molten steel is controlled to be 0.0106%. Before feeding the core-spun yarn, the steel ladle needs to be connected with a pipeline for blowing inert gas again, nitrogen is blown in, and the time for blowing the nitrogen is prolonged for 2min after the yarn feeding is finished so as to ensure the uniformity of the N element in the molten steel. And then sending the molten steel to a continuous casting machine for casting.
A150 mm × 150mm billet is cast on a 6-machine 6-strand billet caster, the tundish temperature during continuous casting is 1534 ℃, the liquidus temperature of steel is 1505 ℃, and the chemical components of molten steel are analyzed by sampling in the caster to be 0.19% of C, 0.62% of Si, 0.88% of Mn, 0.40% of Cr, 0.014% of Nb, 0.023% of P, 0.016% of S, 0.0109% of N, and the balance of Fe and inevitable other impurities. And stacking the casting blanks and naturally cooling to room temperature.
Cooling the casting blank, and then conveying the casting blank to a high-speed wire rod rolling production line for heating and rolling, wherein the rolling specification is
The round bar steel bar. And the heating temperature of the casting blank is 1152 ℃, the soaking temperature is 1100 ℃, and the casting blank is taken out of the furnace for rolling after the total heating time reaches 98 min.
In the rolling of the high-speed wire rod mill, parameters such as rough rolling temperature and finish rolling temperature are correspondingly adjusted by taking the final adjustment of the spinning temperature to 880 ℃.
After the wire is spun by the wire-laying machine, the round bar wire rod steel or the round bar steel bar wire rod steel is cooled to 605 ℃ at a cooling speed of 4 ℃/s, then cooled to 400 ℃ at a cooling speed of 2 ℃/s, finally cooled to 150 ℃ at a cooling speed of 1.0 ℃/s, collected and coiled, and finally bundled by steel belts or steel wires into finished product wire rod steel convenient for transportation and sale.
The mechanical property test result of the steel is as follows: the ReL (Rp0.2) is 4435MPa, the tensile strength is 618MPa, the elongation is 22.7 percent, the maximum force total elongation is 16.2 percent, and the cold bending at 180 ℃ is qualified. The structure of the steel is ferrite plus pearlite.
The chemical components of the prepared comparative steel which is prepared by the same preparation process are 0.17 percent of C, 0.65 percent of Si, 0.78 percent of Mn, 0.040 percent of V, 0.024 percent of P, 0.022 percent of S, 0.0099 percent of N, 0.03 percent of Cr and the balance of Fe and other inevitable impurities, and the specification is that
Round bar steel bar. The mechanical properties of the comparative steel are tested as follows: the ReL (Rp0.2) is 422MPa, the tensile strength is 591MPa, the elongation is 26.3 percent, the maximum total elongation is 17.1 percent, the cold bending at 180 ℃ is qualified, and the tissues of the steel are ferrite and pearlite.
The comparative steel and the inventive steel were subjected to corrosion tests under the conditions of Table 4, and the average weight loss ratio of the inventive steel was 2.498g/m2The average weight loss ratio of the comparative steel was 2.412g/m2The relative corrosion rate of the steel of the invention relative to the comparative steel is 96.6%, and a corrosion test shows that the steel of the invention has certain corrosion resistance.
TABLE 4 Corrosion resistance test results
Claims (9)
1. The microalloy construction steel wire rod containing Nb and Cr is characterized in that: the chemical components are as follows: c, according to weight percentage: 0.15% -0.30%, Si: 0.30% -1.00%, Mn: 0.60% -1.30%, N: 0.0060-0.0180%, P is less than or equal to 0.040%, S is less than or equal to 0.040%, Nb: 0.010-0.050%, Cr: 0.10 to 0.29 percent, and the balance of Fe and inevitable impurities;
the LF furnace production method of the Nb and Cr containing microalloy construction steel wire rod comprises the following steps:
smelting blast furnace molten iron in a converter, refining in an LF furnace, and continuously casting to obtain a steel billet; heating the billet, rolling the billet into a material by a high-speed wire rod rolling mill, and cooling the material to prepare a round rod wire rod or a thread wire rod; feeding a core-spun yarn into a ladle to adjust the N content after refining in an LF furnace; the steel billet comprises the following components in percentage by weight: 0.15% -0.30%, Si: 0.30% -1.00%, Mn: 0.60% -1.30%, N: 0.0060-0.0180%, P is less than or equal to 0.040%, S is less than or equal to 0.040%, Nb: 0.010-0.050%, Cr: 0.10 to 0.29 percent, and the balance of Fe and inevitable impurities; the heating temperature of the steel billet is controlled to be 950-1220 ℃, the soaking temperature is controlled to be 1000-1200 ℃, and the total time of heating and soaking is 90-120 min; in the working procedure of a wire laying machine in the high-speed wire rolling mill, the wire laying temperature is controlled to be 880-960 ℃; the cooling is to cool the steel plate to 600-700 ℃ at a cooling speed of 4-8 ℃/s, then cool the steel plate to 400-500 ℃ at a cooling speed of 2-3 ℃/s, and finally cool the steel plate to 150-300 ℃ at a cooling speed of 0.5-1.0 ℃/s.
2. The LF furnace production method of Nb-Cr microalloy building steel wire rods as recited in claim 1, characterized in that: the method comprises the following steps:
smelting blast furnace molten iron in a converter, refining in an LF furnace, and continuously casting to obtain a steel billet; heating the billet, rolling the billet into a material by a high-speed wire rod rolling mill, and cooling the material to prepare a round rod wire rod or a thread wire rod; feeding a core-spun yarn into a ladle to adjust the N content after refining in an LF furnace; the steel billet comprises the following components in percentage by weight: 0.15% -0.30%, Si: 0.30% -1.00%, Mn: 0.60% -1.30%, N: 0.0060-0.0180%, P is less than or equal to 0.040%, S is less than or equal to 0.040%, Nb: 0.010-0.050%, Cr: 0.10 to 0.29 percent, and the balance of Fe and inevitable impurities; the heating temperature of the steel billet is controlled to be 950-1220 ℃, the soaking temperature is controlled to be 1000-1200 ℃, and the total time of heating and soaking is 90-120 min; in the working procedure of a wire laying machine in the high-speed wire rolling mill, the wire laying temperature is controlled to be 880-960 ℃; the cooling is to cool the steel plate to 600-700 ℃ at a cooling speed of 4-8 ℃/s, then cool the steel plate to 400-500 ℃ at a cooling speed of 2-3 ℃/s, and finally cool the steel plate to 150-300 ℃ at a cooling speed of 0.5-1.0 ℃/s.
3. The LF furnace production method of the Nb-Cr microalloy constructional steel wire rod as claimed in claim 2, wherein: the method comprises the following steps:
a. smelting in a converter: adding molten iron and scrap steel into a converter, carrying out oxygen blowing and decarburization by using the converter, and carrying out smelting, wherein steel is tapped when the content of C in the molten steel is 0.05-0.15%, the content of P is less than or equal to 0.025%, the content of S is less than or equal to 0.035%, and the temperature of the molten steel is greater than or equal to 1650 ℃;
when steel is tapped from 1/3-2/3, FeSi, FeMn, FeCr and FeNb alloys and a C increasing agent are added, and the content of C is controlled to be 0.15-0.30%, the content of Si is 0.30-1.00%, the content of Mn is 0.60-1.30%, the content of Cr is 0.10-0.29%, and the content of Nb is 0.010-0.050%;
b. feeding core-spun yarns: transferring the steel ladle to a steel ladle after tapping, and blowing inert gas into the steel ladle after the steel ladle reaches a small platform behind the furnace; after the steel ladle reaches the LF furnace, adding an N-containing core-spun yarn, and controlling the N content in the molten steel to be 0.0060-0.0180%;
c. continuous casting: controlling the superheat degree of a continuous casting machine to be 20-50 ℃, continuously casting molten steel into a square billet with a billet section of 150mm multiplied by 150 mm-200 mm multiplied by 200mm, and air-cooling to room temperature;
d. heating and rolling a steel billet: controlling the heating temperature of a steel billet to be 950-1220 ℃, controlling the soaking temperature to be 1000-1200 ℃, controlling the total heating and soaking time to be 90-120 min, rolling the steel billet into a round rod wire rod or a thread wire rod by adopting a high-speed wire rod rolling mill, and cooling after rolling to obtain a product; in the wire laying machine procedure in the high-speed wire rolling mill, the wire laying temperature is controlled to be 880-960 ℃; the cooling is to cool the steel plate to 600-700 ℃ at a cooling speed of 4-8 ℃/s, then cool the steel plate to 400-500 ℃ at a cooling speed of 2-3 ℃/s, and finally cool the steel plate to 150-300 ℃ at a cooling speed of 0.5-1.0 ℃/s.
4. The LF furnace production method of the Nb-Cr microalloy constructional steel wire rod as claimed in claim 3, wherein: in the step a, the molten iron requires that the content of S is less than or equal to 0.06 percent.
5. The LF furnace production method of the Nb-Cr microalloy constructional steel wire rod as claimed in claim 3, wherein: in step a, the FeSi and FeMn alloy is replaced by FeSiMn alloy.
6. The LF furnace production method of the Nb-Cr microalloy constructional steel wire rod as claimed in claim 3, wherein: in the step b, the inert gas is at least one of argon or nitrogen.
7. The LF furnace production method of the Nb-Cr microalloy constructional steel wire rod as claimed in claim 3, wherein: in the step b, the time for blowing the inert gas is more than or equal to 2 min.
8. The LF furnace production method of the Nb-Cr microalloy constructional steel wire rod as claimed in claim 3, wherein: in the step b, the electric heating temperature is 60-90 ℃ higher than the liquidus temperature.
9. The LF furnace production method of the Nb-Cr microalloy constructional steel wire rod as claimed in claim 3, wherein: in the step d, the specification of the round rod wire rod or the thread wire rod is phi 6 mm-phi 14.0 mm.
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| CN102051530A (en) * | 2011-01-12 | 2011-05-11 | 南京钢铁股份有限公司 | 48MnV nitrogenous steel and nitrogen adding process thereof |
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