CN109234508B - Medium-carbon steel wire rod with high strength and high plasticity and production method thereof - Google Patents
Medium-carbon steel wire rod with high strength and high plasticity and production method thereof Download PDFInfo
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- CN109234508B CN109234508B CN201811179156.5A CN201811179156A CN109234508B CN 109234508 B CN109234508 B CN 109234508B CN 201811179156 A CN201811179156 A CN 201811179156A CN 109234508 B CN109234508 B CN 109234508B
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/06—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
- 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
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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
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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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
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
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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
- C22C38/28—Ferrous alloys, e.g. steel alloys containing chromium with titanium or zirconium
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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
- C22C38/32—Ferrous alloys, e.g. steel alloys containing chromium with boron
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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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- 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
- C21D2211/009—Pearlite
Abstract
The invention discloses a medium carbon steel wire rod with high strength and high plasticity and a production method thereof, wherein the medium carbon steel wire rod comprises the following chemical components in percentage by mass: c: 0.40-0.50%, Si: 0.15-0.40%, Mn: 0.70-1.20 percent of Fe, less than or equal to 0.015 percent of P, less than or equal to 0.010 percent of S, one or more of Al, Ti, B, Cr and the balance of Fe and inevitable impurities, wherein the content of Al is less than or equal to 0.05 percent, the content of Ti is less than or equal to 0.05 percent, the content of B is less than or equal to 0.005 percent and the content of Cr is less than or equal to 0; the production method comprises the working procedures of smelting, billet heating, wire rolling and wire cooling. The tensile strength of the carbon steel wire rod is more than or equal to 700MPa, the surface shrinkage rate is more than or equal to 55 percent, and the elongation rate is more than or equal to 28 percent; the microstructure consists of massive ferrite and fine lamellar pearlite, the grain size of the ferrite is 7-9 grades, and the Widmannstatten structure grade is less than or equal to 1 grade; the wire rod is used after being drawn by a customer, and high strength and plasticity indexes can be kept.
Description
Technical Field
The invention belongs to the technical field of wire rod production, and particularly relates to a medium carbon steel wire rod with high strength and high plasticity and a production method thereof.
Background
The medium carbon structural steel is mainly used for producing various shaft lever parts, is used in the industries of automobiles, machinery and the like, and is required to have good strength and plasticity indexes. Because the wire rod needs drawing and surface grinding treatment subsequently, the strength and plasticity of the wire rod are mainly ensured by the performance of the base material hot rolling wire rod. According to knowledge of materials science, strength and plasticity are a pair of contradictory indexes, namely, the plasticity index is reduced while the strength is improved.
Patent No. CN102011051A discloses a high-strength high-plasticity medium-carbon transformation induced plasticity steel and a preparation method thereof, wherein the steel comprises the following chemical components: c: 0.24-0.30%, Si: 0.80-1.20%, Mn: 1.40-1.80%, P: 0.030 to 0.075%, V: 0.070-0.090 percent, and the balance Fe, and the steel billet is subjected to forging, hot rolling and cold rolling and then is subjected to heat treatment to obtain the high-performance cold-rolled transformation induced plasticity steel. The steel needs to be processed by cold rolling, heat treatment and other processing procedures, and the chemical composition of the steel is obviously different from that of the invention. Patent No. CN107937823A discloses 'a high-strength high-plasticity alloy steel and a preparation method thereof', which comprises the following chemical components: c: 0.34-0.56%, Cr: 4.57-5.45%, Mo: 0.96-1.35%, Al: 0.74-0.88%, Ti: 0.55-0.74%, Si: 0.23-0.37%, V: 0.11-0.15%, W: 0.15-0.18%, Nb: 0.02-0.06%, Zn: 2.12-2.88%, Mn: 0.12-0.26%, rare earth elements: 1.86-2.54% with the balance being Fe and unavoidable impurities, which steel belongs to the field of high alloy steels, whose chemical composition is significantly different from that of the present invention. Patent No. CN104213033A discloses a high-strength high-plasticity 60 steel hot-rolled wire rod and a production method thereof, wherein the wire rod comprises the following chemical components: c: 0.57-0.65%, Si: 0.17-0.37%, Mn: 0.50-0.80%, Cr: 0.16-0.25 percent of steel wire, less than or equal to 0.35 percent of P, less than or equal to 0.035 percent of S, less than or equal to 0.30 percent of Ni, less than or equal to 0.25 percent of Cu, and the balance of Fe, the tensile strength of the hot-rolled wire rod with the diameter of 6.5mm is 990-1060 MPa, the surface shrinkage is 50-60 percent, the cable reduction rate is 85-90 percent, and the steel wire with thinner wire is easy to pull and draw.
None of the steel grades described in the above patents provide a solution to the improvement of strength and ductility in medium carbon steel.
Aiming at a medium carbon steel wire rod with high strength and high plasticity required by the market, the medium carbon steel wire rod with high strength and high plasticity is developed, so that the requirement of a customer on the product strength can be met, the plasticity index can be ensured not to be reduced, the risk of failure caused by insufficient plasticity of parts of the customer is reduced, and the medium carbon steel wire rod has important significance.
Disclosure of Invention
The invention aims to solve the technical problem of providing a medium carbon steel wire rod with high strength and high plasticity; meanwhile, the invention also provides a production method of the medium carbon steel wire rod with high strength and high plasticity.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows: a medium carbon steel wire rod with high strength and high plasticity comprises the following chemical components in percentage by mass: c: 0.40-0.50%, Si: 0.15-0.40%, Mn: 0.70 to 1.20 percent of Fe, less than or equal to 0.015 percent of P, less than or equal to 0.010 percent of S, one or more of Al, Ti, B, Cr and the balance of Fe and inevitable impurities, wherein the content of Al is less than or equal to 0.05 percent, the content of Ti is less than or equal to 0.05 percent, the content of B is less than or equal to 0.005 percent and the content of Cr is less than or equal to 0.
The specification of the medium carbon steel wire rod is phi 5.5-20 mm.
The microstructure of the medium carbon steel wire rod consists of massive ferrite and fine lamellar pearlite, no reticular ferrite exists, the grain size of the ferrite is 7-9 grades, and the Widmannstatten structure grade is less than or equal to 1 grade.
The medium carbon steel wire rod of the invention comprises the following components: the tensile strength is more than or equal to 700MPa, the surface shrinkage is more than or equal to 55 percent, and the elongation is more than or equal to 28 percent.
The invention also provides a production method of the medium carbon steel wire rod with high strength and high plasticity, which comprises the working procedures of smelting, billet heating, wire rod rolling and wire rod cooling; the steel billet heating procedure comprises continuous casting billet heating and hot rolling billet heating, and the temperature of the heating furnace is 1170-1190 ℃; the wire rolling procedure comprises the steps of finish rolling at the temperature of 840-860 ℃; the wire cooling process adopts a controlled cooling process, and the roller speed is 0.40-0.70 m/s.
In the billet heating procedure, the total heating time of the continuous casting billet in the heating furnace is 200-300min, and the oxygen content in the furnace is less than or equal to 3 percent.
In the billet heating procedure, the total heating time of the hot rolling billet in the heating furnace is 100-130min, and the oxygen content in the furnace is less than or equal to 3 percent.
In the wire rolling procedure, the spinning temperature is 790-810 ℃.
The wire cooling process adopts a controlled cooling process, the heat-insulating cover on the stelmor roller way is completely opened, and the cooling rate of the phase change front section of the wire rod after spinning is controlled to be 2-5 ℃/s.
In the smelting process, the tapped molten steel comprises the following chemical components in percentage by mass: c: 0.40-0.50%, Si: 0.15-0.40%, Mn: 0.70-1.20 percent of Fe, less than or equal to 0.015 percent of P, less than or equal to 0.010 percent of S, one or more of Al, Ti, B, Cr and the balance of Fe and inevitable impurities, wherein the content of Al is less than or equal to 0.05 percent, the content of Ti is less than or equal to 0.05 percent, the content of B is less than or equal to 0.005 percent and the content of Cr is less than or equal to 0; and continuously casting the smelted molten steel into a billet.
The smelting process comprises molten iron desulphurization treatment, top-bottom combined blown converter smelting and L F + RH double refining.
The hot rolling billet is obtained by cogging a continuous casting bloom with the section size of 280 mm x 325, and the size after cogging is 160mm x 160 mm.
The carbon steel wire rod comprises the following chemical components in percentage by weight:
carbon: mainly of carbide (Fe)3C) The form exists in steel and is one of the main elements determining the strength of steel. When the carbon content is 0.40% or less, it becomes difficult to obtain a high tensile strength of 700MPa or more, and therefore, the lower limit of the carbon content is set to 0.40%. When the content of C in the steel increases, the hardness and strength are improved, while the plasticity, toughness and impact toughness are reduced. In order to ensure the plasticity index of the steel, the upper limit of the carbon content is set to 0.50%.
Silicon: while the strength of steel wire rods can be effectively improved by solid solution strengthening, silicon is also a deoxidizing element, and decreases the elongation, shrinkage, and impact toughness of steel. Therefore, the content of silicon is set to 0.15 to 0.40% in consideration of the influence of silicon on the strength and plasticity.
Manganese is soluble in ferrite (α -Fe) and in cementite to form carbide, thereby increasing the strength of steel, and also can be combined with S in steel to form MnS to prevent hot embrittlement, and further, manganese also increases the hardenability of steel to refine the structure of steel, but when the manganese content in steel is too high, segregation is easily formed to deteriorate the workability and plasticity of steel, so that the manganese content is limited to 0.70-1.20%.
Phosphorus: phosphorus forms interstitial solid solution in steel, has the solid solution strengthening effect, improves the strength of the steel, reduces the plasticity and the toughness of the steel, and simultaneously, the phosphorus is easy to generate grain boundary segregation in the steel to deteriorate the plasticity of the steel. Phosphorus is a residual element in steel and cannot be avoided, so that P is limited to be less than or equal to 0.015 percent.
Sulfur: belongs to residual elements, mainly exists in the form of MnS nonmetallic inclusion in steel, reduces the strengthening effect of Mn, is also unfavorable for the cold processing performance of the steel, and the content of Mn should be reduced as much as possible. Therefore, S is limited to be less than or equal to 0.010 percent by combining the current tool level.
Aluminum: aluminum is a deoxidizing element, can reduce the oxygen content of steel, is combined with nitrogen to form AlN, has the function of refining grains, and can improve the tensile strength and the plasticity index of the wire rod at the same time when the grains are refined, but if the content of Al is too much, the Al content is too high2O3The number of inclusions increases, deteriorating cold workability and deteriorating comprehensive properties. Therefore, the Al content is limited to 0.05% or less.
Titanium: on one hand, titanium can be combined with nitrogen in steel, so that the content of free nitrogen is reduced, and the work hardening rate of the steel is reduced; on the other hand, titanium forms fine carbides or carbonitrides in steel, and has the effects of dispersion precipitation strengthening and fine grain strengthening, so that the tensile strength of the steel is increased, and the carbides or carbonitrides also have the effect of reducing the size of pearlite blocks, and the plasticity and cold workability of the steel are improved. However, if the titanium content is too high, coarse carbides or carbonitrides are easily formed in the steel wire rod, and the plasticity and cold workability of the steel are deteriorated. Therefore, the titanium content is limited to 0.05% or less.
Chromium: chromium is an effective alloy element for thinning the pearlite sheet structure, and the tensile strength of the wire rod can be obviously improved; however, when the chromium content is high, the formation of center segregation and quenched structures such as core martensite, bainite and the like is promoted, the risk of brittle fracture is increased, and the plasticity of the steel is reduced. Therefore, Cr is limited to 0.40% or less.
Boron: on one hand, boron is combined with nitrogen to form BN, so that the nitrogen dissolved in the steel is reduced, the strength and the work hardening rate of the wire rod can be reduced, and the improvement of plasticity and drawing performance is facilitated. On the other hand, if the boron content is too high, a boron phase is easily formed in the steel wire rod, and the plasticity and cold workability are deteriorated. Therefore, the amount of boron added is limited to 0.005% or less.
The invention relates to a medium carbon steel wire rod product with high strength and high plasticity, which is based on JIS 4051; the product has Widmannstatten tissue rating standard reference GB/T13299; the grain size rating standard of the product refers to GB/T6394; the standard of the detection method of the mechanical property of the product refers to GB/T228.1.
Adopt the produced beneficial effect of above-mentioned technical scheme to lie in: 1. the invention fully utilizes the influence of each element on the strength and plasticity of the steel to optimize the chemical composition and obtain the optimal combination. 2. The invention makes the wire rod obtain a fine lamellar pearlite structure through a low-temperature rolling technology and a controlled cooling technology, improves the strength and improves the plasticity. 3. The invention eliminates the reticular ferrite which is unfavorable for plasticity by finely controlling the structure of the produced high-strength high-plasticity medium carbon steel wire rod, so that the widmannstatten structure is less than or equal to 1 grade, and the fluctuation of the plasticity index is reduced. 4. The tensile strength of the medium carbon steel wire rod produced by the method is more than or equal to 700MPa, the surface shrinkage is more than or equal to 55 percent, the elongation is more than or equal to 28 percent, and the performance is obviously improved.
Drawings
FIG. 1 is a microstructure of a wire rod of example 1;
FIG. 2 is a microstructure of the wire rod of comparative example 1.
Detailed Description
The invention is described in further detail below with reference to the figures and specific examples.
Example 1
The specification of the medium carbon steel wire rod with high strength and high plasticity is phi 5.5mm, and the chemical composition and the mass percentage of the medium carbon steel wire rod are shown in table 1.
The production method of the medium carbon steel wire rod with high strength and high plasticity comprises the working procedures of smelting, billet heating, wire rolling and wire cooling, and the specific process steps are as follows:
(1) the smelting process comprises the steps of molten iron desulphurization treatment, top-bottom combined blown converter smelting, L F + RH double refining, and the chemical composition and the mass percentage content of the tapping molten steel are shown in table 1;
(2) a billet heating procedure: the billet heating procedure comprises continuous casting billet heating and hot rolling billet heating, and the temperature of the heating furnace is 1180 ℃; the total heating time of the continuous casting billet in the heating furnace is 240min, and the oxygen content in the furnace is 3 percent; the total heating time of the hot rolled blank in a heating furnace is 121min, and the oxygen content in the furnace is 2 percent;
(3) a wire rod rolling procedure: the finish rolling temperature is 850 ℃, and the spinning temperature is 805 ℃;
(4) a wire cooling process: the cooling control process is adopted, the heat preservation cover on the stelmor roller way is completely opened, the cooling speed of the phase change front section of the wire rod after spinning is controlled to be 3 ℃/s, and the roller way speed is controlled to be 0.50 m/s.
The medium carbon steel wire rod with high strength and high plasticity has good strength and plasticity matching, and the microstructure and mechanical property indexes are shown in table 2; the microstructure of the wire rod is shown in figure 1. (examples 2-8 the microstructure of the wire rod is similar to that of FIG. 1 and is omitted)
Example 2
The specification of the medium carbon steel wire rod with high strength and high plasticity is phi 10mm, and the chemical composition and the mass percentage of the medium carbon steel wire rod are shown in table 1.
The production method of the medium carbon steel wire rod with high strength and high plasticity comprises the working procedures of smelting, billet heating, wire rolling and wire cooling, and the specific process steps are as follows:
(1) the smelting process comprises the steps of molten iron desulphurization treatment, top-bottom combined blown converter smelting, L F + RH double refining, and the chemical composition and the mass percentage content of the tapping molten steel are shown in table 1;
(2) a billet heating procedure: the billet heating procedure comprises continuous casting billet heating and hot rolling billet heating, and the temperature of the heating furnace is 1184 ℃; the total heating time of the continuous casting billet in the heating furnace is 200min, and the oxygen content in the furnace is 2%; the total heating time of the hot rolled blank in a heating furnace is 128min, and the oxygen content in the furnace is 1.6 percent;
(3) a wire rod rolling procedure: the finish rolling temperature is 840 ℃ and the spinning temperature is 801 ℃;
(4) a wire cooling process: the cooling control process is adopted, the heat preservation cover on the stelmor roller way is completely opened, the cooling speed of the phase change front section of the wire rod after spinning is controlled to be 2 ℃/s, and the roller way speed is controlled to be 0.40 m/s.
The medium carbon steel wire rod with high strength and high plasticity of the embodiment has good matching of strength and plasticity, and the microstructure and mechanical property indexes are shown in table 2.
Example 3
The specification of the medium carbon steel wire rod with high strength and high plasticity is phi 16mm, and the chemical composition and the mass percentage of the medium carbon steel wire rod are shown in table 1.
The production method of the medium carbon steel wire rod with high strength and high plasticity comprises the working procedures of smelting, billet heating, wire rolling and wire cooling, and the specific process steps are as follows:
(1) the smelting process comprises the steps of molten iron desulphurization treatment, top-bottom combined blown converter smelting, L F + RH double refining, and the chemical composition and the mass percentage content of the tapping molten steel are shown in table 1;
(2) a billet heating procedure: the billet heating procedure comprises continuous casting billet heating and hot rolling billet heating, and the temperature of the heating furnace is 1190 ℃; the total heating time of the continuous casting billet in the heating furnace is 230min, and the oxygen content in the furnace is 1.5%; the total heating time of the hot rolled blank in a heating furnace is 130min, and the oxygen content in the furnace is 1.8 percent;
(3) a wire rod rolling procedure: the precision rolling temperature is 845 ℃, and the spinning temperature is 790 ℃;
(4) a wire cooling process: the cooling control process is adopted, the heat preservation cover on the stelmor roller way is completely opened, the cooling speed of the phase change front section of the wire rod after spinning is controlled to be 5 ℃/s, and the roller way speed is controlled to be 0.40 m/s.
The medium carbon steel wire rod with high strength and high plasticity of the embodiment has good matching of strength and plasticity, and the microstructure and mechanical property indexes are shown in table 2.
Example 4
The specification of the medium carbon steel wire rod with high strength and high plasticity is phi 20mm, and the chemical composition and the mass percentage of the medium carbon steel wire rod are shown in table 1.
The production method of the medium carbon steel wire rod with high strength and high plasticity comprises the working procedures of smelting, billet heating, wire rolling and wire cooling, and the specific process steps are as follows:
(1) the smelting process comprises the steps of molten iron desulphurization treatment, top-bottom combined blown converter smelting, L F + RH double refining, and the chemical composition and the mass percentage content of the tapping molten steel are shown in table 1;
(2) a billet heating procedure: the billet heating procedure comprises continuous casting billet heating and hot rolling billet heating, and the temperature of the heating furnace is 1170 ℃; the total heating time of the continuous casting billet in the heating furnace is 270min, and the oxygen content in the furnace is 1.1%; the total heating time of the hot rolled blank in a heating furnace is 119min, and the oxygen content in the furnace is 3 percent;
(3) a wire rod rolling procedure: the finish rolling temperature is 855 ℃, and the spinning temperature is 798 ℃;
(4) a wire cooling process: the cooling control process is adopted, the heat preservation cover on the stelmor roller way is completely opened, the cooling speed of the wire rod phase change front section after spinning is controlled to be 4 ℃/s, and the roller way speed is controlled to be 0.60 m/s.
The medium carbon steel wire rod with high strength and high plasticity of the embodiment has good matching of strength and plasticity, and the microstructure and mechanical property indexes are shown in table 2.
Example 5
The specification of the medium carbon steel wire rod with high strength and high plasticity is phi 18mm, and the chemical composition and the mass percentage of the medium carbon steel wire rod are shown in table 1.
The production method of the medium carbon steel wire rod with high strength and high plasticity comprises the working procedures of smelting, billet heating, wire rolling and wire cooling, and the specific process steps are as follows:
(1) the smelting process comprises the steps of molten iron desulphurization treatment, top-bottom combined blown converter smelting, L F + RH double refining, and the chemical composition and the mass percentage content of the tapping molten steel are shown in table 1;
(2) a billet heating procedure: the billet heating procedure comprises continuous casting billet heating and hot rolling billet heating, and the temperature of the heating furnace is 1182 ℃; the total heating time of the continuous casting billet in the heating furnace is 300min, and the oxygen content in the furnace is 2.5 percent; the total heating time of the hot rolled blank in a heating furnace is 100min, and the oxygen content in the furnace is 2.1 percent;
(3) a wire rod rolling procedure: the finish rolling temperature is 860 ℃, and the spinning temperature is 810 ℃;
(4) a wire cooling process: the cooling control process is adopted, the heat preservation cover on the stelmor roller way is completely opened, the cooling speed of the phase change front section of the wire rod after spinning is controlled to be 2.5 ℃/s, and the roller way speed is controlled to be 0.70 m/s.
The medium carbon steel wire rod with high strength and high plasticity of the embodiment has good matching of strength and plasticity, and the microstructure and mechanical property indexes are shown in table 2.
Example 6
The specification of the medium carbon steel wire rod with high strength and high plasticity is phi 14mm, and the chemical composition and the mass percentage of the medium carbon steel wire rod are shown in table 1.
The production method of the medium carbon steel wire rod with high strength and high plasticity comprises the working procedures of smelting, billet heating, wire rolling and wire cooling, and the specific process steps are as follows:
(1) the smelting process comprises the steps of molten iron desulphurization treatment, top-bottom combined blown converter smelting, L F + RH double refining, and the chemical composition and the mass percentage content of the tapping molten steel are shown in table 1;
(2) a billet heating procedure: the billet heating procedure comprises continuous casting billet heating and hot rolling billet heating, and the temperature of the heating furnace is 1176 ℃; the total heating time of the continuous casting billet in the heating furnace is 250min, and the oxygen content in the furnace is 1 percent; the total heating time of the hot rolled blank in a heating furnace is 115min, and the oxygen content in the furnace is 2.4 percent;
(3) a wire rod rolling procedure: the finish rolling temperature is 852 ℃, and the spinning temperature is 797 ℃;
(4) a wire cooling process: the cooling control process is adopted, the heat preservation cover on the stelmor roller way is completely opened, the cooling speed of the phase change front section of the wire rod after spinning is controlled to be 4.5 ℃/s, and the roller way speed is controlled to be 0.60 m/s.
The medium carbon steel wire rod with high strength and high plasticity of the embodiment has good matching of strength and plasticity, and the microstructure and mechanical property indexes are shown in table 2.
Example 7
The specification of the medium carbon steel wire rod with high strength and high plasticity is phi 8mm, and the chemical composition and the mass percentage of the medium carbon steel wire rod are shown in table 1.
The production method of the medium carbon steel wire rod with high strength and high plasticity comprises the working procedures of smelting, billet heating, wire rolling and wire cooling, and the specific process steps are as follows:
(1) the smelting process comprises the steps of molten iron desulphurization treatment, top-bottom combined blown converter smelting, L F + RH double refining, and the chemical composition and the mass percentage content of the tapping molten steel are shown in table 1;
(2) a billet heating procedure: the billet heating procedure comprises continuous casting billet heating and hot rolling billet heating, and the temperature of the heating furnace is 1173 ℃; the total heating time of the continuous casting billet in the heating furnace is 210min, and the oxygen content in the furnace is 0.5%; the total heating time of the hot rolled blank in a heating furnace is 110min, and the oxygen content in the furnace is 1 percent;
(3) a wire rod rolling procedure: the finish rolling temperature is 847 ℃, and the spinning temperature is 793 ℃;
(4) a wire cooling process: the cooling control process is adopted, the heat preservation cover on the stelmor roller way is completely opened, the cooling speed of the phase change front section of the wire rod after spinning is controlled to be 3.5 ℃/s, and the roller way speed is controlled to be 0.45 m/s.
The medium carbon steel wire rod with high strength and high plasticity of the embodiment has good matching of strength and plasticity, and the microstructure and mechanical property indexes are shown in table 2.
Example 8
The specification of the medium carbon steel wire rod with high strength and high plasticity is phi 12mm, and the chemical composition and the mass percentage of the medium carbon steel wire rod are shown in table 1.
The production method of the medium carbon steel wire rod with high strength and high plasticity comprises the working procedures of smelting, billet heating, wire rolling and wire cooling, and the specific process steps are as follows:
(1) the smelting process comprises the steps of molten iron desulphurization treatment, top-bottom combined blown converter smelting, L F + RH double refining, and the chemical composition and the mass percentage content of the tapping molten steel are shown in table 1;
(2) a billet heating procedure: the billet heating procedure comprises continuous casting billet heating and hot rolling billet heating, and the temperature of the heating furnace is 1187 ℃; the total heating time of the continuous casting billet in the heating furnace is 285min, and the oxygen content in the furnace is 2.7 percent; the total heating time of the hot rolled blank in a heating furnace is 125min, and the oxygen content in the furnace is 2.8 percent;
(3) a wire rod rolling procedure: the finish rolling temperature is 857 ℃, and the spinning temperature is 807 ℃;
(4) a wire cooling process: the cooling control process is adopted, the heat preservation cover on the stelmor roller way is completely opened, the cooling speed of the phase change front section of the wire rod after spinning is controlled to be 3 ℃/s, and the roller way speed is controlled to be 0.55 m/s.
The medium carbon steel wire rod with high strength and high plasticity of the embodiment has good matching of strength and plasticity, and the microstructure and mechanical property indexes are shown in table 2.
Comparative example 1
The specification of the wire rod of the comparative example is phi 14mm, and the chemical composition and the mass percentage of the wire rod are shown in Table 1.
The production method of the wire rod of the comparative example comprises the working procedures of smelting, billet heating, wire rod rolling and wire rod cooling, and the specific process steps are as follows:
(1) the smelting process comprises the steps of molten iron desulphurization treatment, top-bottom combined blown converter smelting, L F + RH double refining, and the chemical composition and the mass percentage content of the tapping molten steel are shown in table 1;
(2) a billet heating procedure: the billet heating procedure comprises continuous casting billet heating and hot rolling billet heating, and the temperature of the heating furnace is 1120 ℃; the total heating time of the continuous casting billet in the heating furnace is 200min, and the oxygen content in the furnace is 3%; the total heating time of the hot rolled blank in a heating furnace is 125min, and the oxygen content in the furnace is 3 percent;
(3) a wire rod rolling procedure: the finish rolling temperature is 900 ℃, and the spinning temperature is 880 ℃;
(4) a wire cooling process: the cooling control process is adopted, the heat preservation cover on the stelmor roller way is completely opened, the cooling speed of the phase change front section of the wire rod after spinning is controlled to be 1 ℃/s, and the roller way speed is controlled to be 0.30 m/s.
The microstructure and mechanical property indexes of the comparative example are shown in a table 2; the microstructure of the wire rod is shown in FIG. 2.
Table 1 examples 1 to 8 and comparative example 1 chemical composition and mass% thereof
The balance of the ingredients in table 1 is Fe and unavoidable impurities.
TABLE 2 wire rod organization and Properties of examples 1-8 and comparative example 1
As can be seen from the examples and the comparative examples, the medium carbon steel wire rod with high strength and high plasticity has good strength and plasticity matching, the microstructure consists of blocky ferrite and fine lamellar pearlite, no reticular ferrite exists, the ferrite grain size is 7-9 grade, and the Widmannstatten structure grade is less than or equal to 1 grade; the tensile strength is more than or equal to 700MPa, the surface shrinkage is more than or equal to 55 percent, the elongation is more than or equal to 28 percent, and the performance is obviously improved
Although the present invention has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that: modifications and equivalents may be made thereto without departing from the spirit and scope of the invention and it is intended to cover in the claims the invention as defined in the appended claims.
Claims (7)
1. The medium carbon steel wire rod with high strength and high plasticity is characterized by comprising the following chemical components in percentage by mass: c: 0.40-0.50%, Si: 0.18-0.40%, Mn: 0.70-1.10 percent of steel wire rod, less than or equal to 0.015 percent of P, less than or equal to 0.010 percent of S, one or more of Al, less than or equal to 0.05 percent of Ti, less than or equal to 0.03 percent of B, less than or equal to 0.005 percent of Cr, and the balance of Fe and inevitable impurities, wherein the medium carbon steel wire rod comprises the following components in percentage by weight: the tensile strength is 700-750MPa, the area shrinkage is 55-65%, and the elongation is 29-35%; the medium carbon steel wire rod is phi 5.5-20mm in specification and is produced by the following method: comprises the working procedures of smelting, billet heating, wire rolling and wire cooling; the steel billet heating procedure comprises continuous casting billet heating and hot rolling billet heating, and the temperature of the heating furnace is 1170-1190 ℃; the wire rolling procedure comprises the steps of finish rolling at the temperature of 840-860 ℃; the wire cooling process adopts a controlled cooling process, the speed of a roller way is 0.40-0.70m/s, a heat preservation cover on a stelmor roller way is completely opened, and the cooling speed of the phase change front section of the wire rod after spinning is controlled to be 2-5 ℃/s; the hot-rolled blank is obtained by cogging a continuous casting bloom with the section size of 280 mm x 325, and the size after cogging is 160mm x 160 mm.
2. A medium carbon steel wire rod with high strength and high plasticity according to claim 1, wherein the microstructure of the medium carbon steel wire rod consists of massive ferrite and fine lamellar pearlite, no reticular ferrite, ferrite grain size of 7-9 grade, and Widmannstatten grade no more than 1 grade.
3. The method for producing a medium carbon steel wire rod with high strength and high plasticity according to claim 1 or 2, wherein the production method comprises the steps of smelting, billet heating, wire rod rolling and wire rod cooling; the steel billet heating procedure comprises continuous casting billet heating and hot rolling billet heating, and the temperature of the heating furnace is 1170-1190 ℃; the wire rolling procedure comprises the steps of finish rolling at the temperature of 840-860 ℃; the wire cooling process adopts a controlled cooling process, the speed of a roller way is 0.40-0.70m/s, a heat preservation cover on a stelmor roller way is completely opened, and the cooling speed of the phase change front section of the wire rod after spinning is controlled to be 2-5 ℃/s; the hot-rolled blank is obtained by cogging a continuous casting bloom with the section size of 280 mm x 325, and the size after cogging is 160mm x 160 mm.
4. The method for producing a medium carbon steel wire rod with high strength and high plasticity as claimed in claim 3, wherein the steel billet heating step comprises a total heating time of the continuous casting billet in the heating furnace of 200-300min, and the oxygen content in the furnace is less than or equal to 3%.
5. The method for producing a medium carbon steel wire rod with high strength and high plasticity according to claim 3, wherein the steel billet heating step comprises a total heating time of the hot rolled billet in the heating furnace of 100-130min, and the oxygen content in the furnace is less than or equal to 3%.
6. The method for producing a medium carbon steel wire rod with high strength and high plasticity according to any one of claims 3 to 5, wherein the wire rolling process has a spinning temperature of 790 ℃ to 810 ℃.
7. The method for producing the medium carbon steel wire rod with high strength and high plasticity according to any one of claims 3 to 5, wherein the smelting process comprises the following chemical components in percentage by mass: c: 0.40-0.50%, Si: 0.18-0.40%, Mn: 0.70-1.10 percent of Fe, less than or equal to 0.015 percent of P, less than or equal to 0.010 percent of S, one or more of Al, Ti, B, Cr and the balance of Fe and inevitable impurities, wherein the content of Al is less than or equal to 0.05 percent, the content of Ti is less than or equal to 0.03 percent, the content of B is less than or equal to 0.005 percent and the content of Cr is less than or equal to 0; and continuously casting the smelted molten steel into a billet.
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