CN117966042A - Base metal high-carbon hard wire steel hot-rolled wire rod for deep-drawn high-strength steel wire and preparation method thereof - Google Patents
Base metal high-carbon hard wire steel hot-rolled wire rod for deep-drawn high-strength steel wire and preparation method thereof Download PDFInfo
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 116
- 239000010959 steel Substances 0.000 title claims abstract description 116
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 57
- 239000010953 base metal Substances 0.000 title claims abstract description 8
- 238000002360 preparation method Methods 0.000 title abstract description 8
- 239000002184 metal Substances 0.000 claims abstract description 17
- 229910052751 metal Inorganic materials 0.000 claims abstract description 17
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 14
- 239000000126 substance Substances 0.000 claims abstract description 14
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 12
- 230000009467 reduction Effects 0.000 claims abstract description 10
- 239000012535 impurity Substances 0.000 claims abstract description 9
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 7
- 229910052750 molybdenum Inorganic materials 0.000 claims abstract description 7
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 7
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 6
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 6
- 238000005096 rolling process Methods 0.000 claims description 106
- 238000001816 cooling Methods 0.000 claims description 75
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 57
- 238000000034 method Methods 0.000 claims description 32
- 238000010438 heat treatment Methods 0.000 claims description 25
- 238000009987 spinning Methods 0.000 claims description 14
- 238000004519 manufacturing process Methods 0.000 claims description 13
- 238000010926 purge Methods 0.000 claims description 13
- 239000000463 material Substances 0.000 claims description 12
- 238000004513 sizing Methods 0.000 claims description 12
- 238000002791 soaking Methods 0.000 claims description 12
- 230000008569 process Effects 0.000 claims description 11
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 10
- 239000000203 mixture Substances 0.000 claims description 6
- 238000004321 preservation Methods 0.000 claims description 5
- 229910000639 Spring steel Inorganic materials 0.000 abstract 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 24
- 229910052742 iron Inorganic materials 0.000 description 9
- FBPFZTCFMRRESA-JGWLITMVSA-N D-glucitol Chemical compound OC[C@H](O)[C@@H](O)[C@H](O)[C@H](O)CO FBPFZTCFMRRESA-JGWLITMVSA-N 0.000 description 7
- 238000005261 decarburization Methods 0.000 description 6
- 238000007689 inspection Methods 0.000 description 6
- 238000001514 detection method Methods 0.000 description 5
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical group [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 4
- 230000009466 transformation Effects 0.000 description 4
- 230000032683 aging Effects 0.000 description 3
- 239000007769 metal material Substances 0.000 description 3
- 229910001562 pearlite Inorganic materials 0.000 description 3
- 238000009864 tensile test Methods 0.000 description 3
- 229910000677 High-carbon steel Inorganic materials 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- 238000000691 measurement method Methods 0.000 description 2
- 238000003723 Smelting Methods 0.000 description 1
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- 230000004075 alteration Effects 0.000 description 1
- 229910001566 austenite Inorganic materials 0.000 description 1
- 229910001563 bainite Inorganic materials 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
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- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000005098 hot rolling Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 125000004433 nitrogen atom Chemical group N* 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000005554 pickling Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
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Abstract
The invention discloses a parent metal high-carbon hard wire steel hot-rolled round wire rod for deep drawing high-strength steel wires and a preparation method thereof. The base metal high-carbon hard wire steel hot-rolled round wire rod for the deep-drawn high-strength steel wire comprises the following chemical components in percentage by mass: 0.60 to 0.65 percent of C, 0.20 to 0.38 percent of Si, 0.45 to 0.65 percent of Mn, less than or equal to 0.015 percent of P, less than or equal to 0.015 percent of S, less than or equal to 0.010 percent of Mo, less than or equal to 0.10 percent of Cr, less than or equal to 0.0030 percent of N, and less than or equal to 0.0020 percent of O; and C+Si+Mn is more than or equal to 1.30%, C+Si+Mn+Mo+Cr is less than or equal to 1.75%; the balance of Fe and unavoidable impurities. The preparation method is characterized in that the metallurgical structure of the prepared high-carbon hard wire steel hot-rolled disc strip is S+a small amount of P+a small amount of F, S accounts for 90-95%, P is less than 6%, F is less than 5%, the tensile strength is 960-985 MPa, the area reduction rate is 65-70%, the same ring difference of the tensile strength is less than or equal to 20MPa, the high-strength spring steel wire has good drawing performance and the like, and the requirements of deep drawing specification phi 1.2-1.6mm high-strength spring steel wires are met.
Description
Technical Field
The invention belongs to the field of steel smelting, and particularly relates to a parent metal high-carbon hard wire steel hot-rolled wire rod for deep drawing high-strength steel wires and a preparation method thereof.
Background
The hot rolled steel wire rod of base metal high carbon hard wire for deep drawing high strength steel wire is the material of steel product industry and is widely used in the production of cement steel nails, galvanized iron wires, umbrella frame, steel wire ropes and springs. With the high-speed development of the steel product industry in China, the requirement for hot-rolling disc strips of parent metal high-carbon hard wire steel for deep drawing high-strength steel wires is high. Meanwhile, in order to meet the requirements of green, environment-friendly and high-quality development in China, the downstream steel product industry adopts a mechanical shelling method to replace an acid pickling process with great influence on the environment in the production process of drawn steel wires, and simultaneously adopts a deep drawing and high-drawing speed mode to produce high-strength steel wires with the specification phi of 1.2-1.6mm to replace steel wires with large common strength so as to improve the added value of the drawn steel wires and reduce the consumption of the materials of the downstream steel products. Therefore, the surface iron scale, the processing performance and the service performance of the hot-rolled disc strip of the parent metal high-carbon hard wire steel for deep drawing high-strength steel wires are required to be higher.
The invention aims to provide a parent metal high-carbon hard wire steel hot-rolled wire rod for deep drawing high-strength steel wires with excellent drawing performance and a preparation method thereof.
Disclosure of Invention
The first object of the present invention is to provide a parent metal high carbon hard wire steel hot rolled wire rod for deep drawing high strength steel wire; the second object of the present invention is to provide a method for producing the parent metal high carbon hard wire steel hot rolled wire rod for deep drawing high strength steel wire.
The first object of the invention is realized in that the base material high-carbon hard wire steel hot-rolled round wire rod for deep drawing high-strength steel wires comprises the following chemical components in percentage by mass: 0.60 to 0.65 percent of C, 0.20 to 0.38 percent of Si, 0.45 to 0.65 percent of Mn, less than or equal to 0.015 percent of P, less than or equal to 0.015 percent of S, less than or equal to 0.010 percent of Mo, less than or equal to 0.10 percent of Cr, less than or equal to 0.0030 percent of N, and less than or equal to 0.0020 percent of O; and C+Si+Mn is more than or equal to 1.30%, C+Si+Mn+Mo+Cr is less than or equal to 1.75%; the balance of Fe and unavoidable impurities.
The second object of the invention is realized by the method for preparing the hot rolled round wire rod of the parent metal high-carbon hard wire steel for deep drawing high-strength steel wires, which comprises the working procedures of billet heating, high-pressure water descaling, rough and medium rolling and pre-finish rolling, pre-controlled cooling, finish rolling, controlled cooling after finish rolling, reducing and sizing module rolling, controlled cooling after rolling, wire spinning, air cooling, coil collecting and natural cooling;
In the billet heating procedure, the temperature of a preheating section is 830-870 ℃, the temperature of a heating section is 1050-1080 ℃, and the temperature of a soaking section is 1030-1060 ℃;
In the rough intermediate rolling and pre-finish rolling processes, the initial rolling temperature of a roughing mill is 970-990 ℃, the rolling is carried out for 18 times, and the total rolling reduction is 99.05-99.20%;
In the finish rolling process, the temperature of a finish rolling rolled piece is 940-960 ℃, the rolling is carried out for 6 times, the rolling outlet speed is controlled to be 51-52 m/s, and the total deformation rate of finish rolling is controlled to be 73.20-73.30%;
In the rolling process of the reducing sizing module rolling mill, the inlet temperature of a reducing sizing mill is 900-920 ℃, the rolling is performed for 4 times, the rolling outlet speed is controlled to be 95-96 m/s, and the total deformation rate is controlled to be 45.10-45.20%;
in the spinning step, spinning is performed at a spinning temperature of 920 to 940 ℃ at a speed of 97m/s to form a coil.
According to the preparation method of the base material high-carbon hard wire steel hot-rolled wire rod for deep drawing high-strength steel wires, the depth of a decarburized layer and a metallographic structure of the wire rod are controlled through the optimization design of steel components and the integration innovation of multiple processes of heating, rolling pass, rolling deformation rate, deformation temperature, wire-throwing temperature after rolling, roller speed, air cooling and the like, so that the natural aging time is shortened, and the deep drawing performance of the wire rod is improved. The invention has stable process and strong applicability, the iron scale on the surface of the prepared wire rod is easy to fall off, the decarburization is light, the depth of a decarburized layer is less than or equal to 0.03mm, the requirements of the grade I of the national standard are better, the metallographic structure is S+less than P+less than F, S accounts for 90-95%, P is less than 6%, F is less than 5%, the tensile strength is 960-985 MPa, the area shrinkage is 65-70%, the same circle difference of the tensile strength is less than or equal to 20MPa, the wire rod has excellent drawing performance and the like, the use requirement of the high-strength spring wire with the deep drawing specification phi of 1.2-1.6mm of a downstream user is met, and the market competitiveness of the product is obviously improved.
Drawings
FIG. 1 is a photograph showing the metallographic structure of a hot rolled disc strip of phi 6.5mm high carbon hard wire steel prepared in example 1;
FIG. 2 is a photograph showing the metallographic structure of a hot rolled disc strip of phi 6.5mm high carbon hard wire steel prepared in example 1;
FIG. 3 is a photograph showing the metallographic structure of a hot rolled disc strip of phi 6.5mm high carbon hard wire steel prepared in example 1.
Detailed Description
The invention is further described below without limiting the invention in any way, and any alterations or substitutions based on the teachings of the invention are within the scope of the invention.
The invention provides a base metal high-carbon hard wire steel hot-rolled round wire rod for deep drawing high-strength steel wires, which comprises the following chemical components in percentage by mass: 0.60 to 0.65 percent of C, 0.20 to 0.38 percent of Si, 0.45 to 0.65 percent of Mn, less than or equal to 0.015 percent of P, less than or equal to 0.015 percent of S, less than or equal to 0.010 percent of Mo, less than or equal to 0.10 percent of Cr, less than or equal to 0.0030 percent of N, and less than or equal to 0.0020 percent of O; and C+Si+Mn is more than or equal to 1.30%, C+Si+Mn+Mo+Cr is less than or equal to 1.75%; the balance of Fe and unavoidable impurities. Wherein C+Si+Mn is more than or equal to 1.30%, and the purpose of the method is to ensure that the prepared wire rod has high enough tensile strength and meets the use requirement of downstream users; mo is less than or equal to 0.010%, cr is less than or equal to 0.10% and C+Si+Mn+Mo+Cr is less than or equal to 1.75%, and the purpose is to prevent the generation of bainite metallographic structure which is unfavorable for drawing due to improper air cooling control after rolling; n is less than or equal to 0.0030 percent, and the purpose of the method is to reduce the number of supersaturated interstitial N atoms in the steel, so as to shorten the aging period of the steel, improve the aging performance and meet the use requirement and the supply period of users.
The nominal diameter of the high-carbon hard wire steel hot-rolled round wire rod is 6.5mm.
The depth of the decarburized layer of the hot-rolled disc strip of the high-carbon hard wire steel is less than or equal to 0.03mm, the metallographic structure is S+a small amount of P+a small amount of F, wherein S accounts for 90-95%, P is less than 6%, F is less than 5%, the tensile strength is 960-985 MPa, the area shrinkage is 65-70%, and the same circle difference of the tensile strength is less than or equal to 20MPa.
The invention also provides a preparation method of the parent metal high-carbon hard wire steel hot-rolled round wire rod for deep drawing high-strength steel wires, which comprises the working procedures of heating, high-pressure water descaling, rough rolling, medium rolling, pre-finish rolling, pre-controlled cooling, finish rolling, controlled cooling after finish rolling, reducing sizing module rolling, controlled cooling after rolling, wire laying, air cooling, coil collecting, natural cooling and the like, and specifically comprises the following steps:
the heating process is as follows: feeding a square billet with 165mm multiplied by 165mm, the chemical components of which meet the requirements, into a heating furnace, controlling the temperature of a preheating section to 830-870 ℃, the temperature of a heating section to 1050-1080 ℃ and the temperature of a soaking section to 1030-1060 ℃, keeping the billet in the soaking section for 35-40 min, and controlling the total stay time of the billet in the heating furnace to 150-180 min; the chemical composition meeting the requirements means that the chemical composition of the square billet is as follows in percentage by mass: 0.60 to 0.65 percent of C, 0.20 to 0.38 percent of Si, 0.45 to 0.65 percent of Mn, less than or equal to 0.015 percent of P, less than or equal to 0.015 percent of S, less than or equal to 0.010 percent of Mo, less than or equal to 0.10 percent of Cr, less than or equal to 0.0030 percent of N and less than or equal to 0.0020 percent of O; and the requirements of C+Si+Mn is more than or equal to 1.30%, C+Si+Mn+Mo+Cr is less than or equal to 1.75%; the balance of Fe and unavoidable impurities. The steel billet is heated at each section of the heating furnace, the soaking section and the total time of the furnace, firstly, the purpose is to ensure that the inside and the outside of the steel billet and the whole strip are heated uniformly, prevent the prior austenite crystal grains from being oversized, realize matching with the subsequent controlled rolling and cooling processes, prevent the wire rod from generating excessive ferrite and pearlite tissues, ensure the sorbite content to reach 90-95%, and meet the deep drawing requirement of downstream users. Secondly, in order to prevent too deep decarburization of the surface of the billet caused by too long furnace time, the use requirement of a user cannot be met, and the like.
The descaling procedure refers to: the water pressure is 20MPa, the descaling speed is 0.2m/s, the scale on the surface of the steel billet is removed, and the initial rolling temperature of the steel billet entering the roughing mill after descaling is ensured to be 970-990 ℃. The purpose is to prevent surface quality defects caused by the pressing of surface oxide scales.
The rough intermediate rolling and pre-finish rolling steps are as follows: rough intermediate rolling and pre-finish rolling: the steel billet heated to 970-990 ℃ is rolled for eighteen times, and the total rolling reduction is 99.05-99.20%.
The pre-cooling control procedure refers to: the rolled piece after exiting the pre-finishing mill group is pre-cooled in 2 sections, the total water volume is 1000m 3/h, the specific water volume is 1.0:1.0, 4 nozzles are opened in each section, the water pressure is 0.57-0.58 MPa, the water cooling is carried out between the sections, and the reverse purging is carried out, so that the cooling uniformity is ensured, and the temperature of the rolled piece entering the finish rolling mill is ensured to be 940-960 ℃.
The finish rolling process is as follows: and (3) carrying out 6-pass rolling on the rolled piece pre-cooled to 940-960 ℃, controlling the rolling outlet speed to be 51-52 m/s, and controlling the total deformation rate of finish rolling to be 73.20-73.30%.
And (3) cooling in a controlled manner after finish rolling: and 3 sections of the finished rolled piece are cooled, the total water quantity is controlled to be 1000m 3/h, the specific water quantity is controlled to be 1.0:1.0:1.0, the three sections are respectively opened for 4, 3 and 3 nozzles, the water pressure is 0.56-0.57 MPa, the cooling is carried out between the sections, the back purging is carried out after the water cooling is carried out between the sections, so that the cooling uniformity is ensured, and the temperature of the mill entering a reducing sizing module is ensured to be 900-920 ℃.
The rolling procedure of the reducing sizing module rolling mill comprises the following steps: 4-pass rolling is carried out on the rolled piece cooled to 900-920 ℃, the rolling outlet speed is controlled to be 95-96 m/s, and the total deformation rate is controlled to be 45.10-45.20%.
The post-rolling control cooling procedure comprises the following steps: the rolled piece after final rolling is cooled by adopting 1 section, the total water quantity is controlled to be 1000m 3/h, 3 nozzles are opened for cooling under the water pressure of 0.62-0.63 MPa, and the reverse purging is carried out after the section so as to ensure the cooling uniformity and ensure the spinning temperature to be controlled to be 920-940 ℃. The spinning temperature is 920-940 ℃, and the purpose is to ensure that the outlet of the No.2 fan is cooled sufficiently in the subsequent air cooling process, so that the wire rod forms a supercooled deformed austenitic structure, and conditions are created for the subsequent sorbite transformation. The second purpose is to ensure that the surface of the rolled wire rod generates the required secondary iron oxide scale composition, thereby meeting the requirements that the iron oxide scale is easy to fall off when a downstream user mechanically dehulled, ensuring the uniform phosphating of the surface of the wire rod and easy drawing.
The spinning procedure comprises the following steps: and (3) carrying out spinning and coiling on the rolled piece which is cooled to 920-940 ℃ after rolling at the speed of 97 m/s.
The air cooling procedure comprises the following steps: the heat preservation cover on the loose coil conveying line is fully opened, the first section roller way speed is 0.90m/s, the first section roller way speed is 0.92m/s, the second section roller way speed is 0.94m/s, the third section roller way speed is 0.96m/s, the fourth section to last section roller way speed is 0.98m/s, a1 #～7# fan is started for air cooling, the fan air quantity and the air speed are controlled to ensure that the outlet temperature of the 1 # fan is 730-740 ℃, the outlet temperature of the 2 # fan is 610-620 ℃, and the outlet temperature of the 3 #～4# fan is: 630-640 ℃,5 # fan outlet temperature 540-550 ℃,6 # fan outlet temperature 500-510 ℃ and 7 # fan outlet temperature 430-440 ℃. The technological parameters of the working procedure are set to control the lap joint density of the unreeling wire rod above each section of roller way to be matched with the cooling capacity of the fan through the integrated coupling control of the processes such as the wire laying speed, the wire laying temperature, the roller way speed, the fan air quantity and the like, so that the metallographic structure of the wire rod is controlled at the required cooling speed. Meanwhile, the gravity center of the coil strip of the coil is guaranteed to be stable, coil production accidents caused by coil turning are prevented, and stable and smooth production is guaranteed. The temperature of the outlet of the 1 #、2# fan is matched with the speed of the 1-section roller way, so that the sufficient cooling speed is ensured, the inside and outside of the wire rod rapidly pass through an iron rope body and pearlite transformation area, the sorbite transformation is started from the inlet of 3 #, and the iron rope body and pearlite content is reduced; the outlet temperature of each fan of 3 #～7# is matched with the speed of a roller way above the fan, so that the purpose is to offset the phase change heat, the internal and external temperatures of the wire rod are in the sorbite phase change temperature region for about 21 seconds to fully carry out sorbite transformation, and the bainitic structure which is unfavorable for drawing is prevented from being formed at the non-lap joint part.
The collecting and rolling and natural cooling processes are as follows: and (3) conveying the scattered coil rod after air cooling to a collecting and rolling disc through a subsequent scattered coil conveying roller way, and naturally cooling to room temperature (15-25 ℃) to obtain the high-carbon hard wire steel hot-rolled disc rod with the required metallographic structure and mechanical property.
Example 1
The chemical components of the billet are ：C0.63%、Si0.22%、Mn0.45%、P0.015%、S0.015%、Mo0.010%、Cr0.10%、N0.0018%、O0.0020%、C+Si+Mn=1.30% 、C+Si+Mn+Mo+Cr=1.41%; percent by mass and the balance of Fe and unavoidable impurities.
And (3) feeding a 165mm multiplied by 165mm cold square billet meeting the chemical component requirements into a heating furnace for heating, controlling the temperature of a preheating section to be 830 ℃, the temperature of a heating section to be 1080 ℃, the temperature of a soaking section to be 1060 ℃, keeping the steel billet in the soaking section for 35min, controlling the total residence time of the steel billet in the heating furnace to be 150min, removing iron scales on the surface of the steel billet after discharging, adopting 20MPa water pressure and 0.2m/s descaling speed to remove the iron scales on the surface of the steel billet, and obtaining the steel billet with the initial rolling temperature of 990 ℃ for eighteen-pass rough rolling and pre-finish rolling, wherein the rolling total reduction is 99.20%. And pre-cooling the rolled piece after exiting the pre-finishing mill group in 2 sections, wherein the total water volume is 1000m 3/h, the specific water volume is 1.0:1.0, 4 nozzles are opened in each section, the water pressure is 0.58MPa, cooling is carried out, and reverse purging is carried out after water cooling between sections, so that the finished rolled piece entering the finishing mill at 960 ℃ is obtained. The rolled piece at 960 ℃ enters a finishing mill group to be rolled for 6 times, the rolling outlet speed is controlled to be 52m/s, and the total deformation rate of the finishing mill is 73.20%. And (3) cooling the finish-rolled piece in 3 sections, controlling the total water quantity to be 1000m 3/h, controlling the specific water quantity to be 1.0:1.0:1.0, respectively starting 4, 3 and 3 nozzles for cooling under the water pressure of 0.57MPa in the three sections, and carrying out reverse purging after water cooling among the sections, thereby obtaining the finish-rolled cold-controlled rolled piece at 920 ℃. And (3) feeding the rolled piece cooled to 920 ℃ into a reducing sizing module rolling mill for 4 times, controlling the rolling outlet speed to be 96m/s, and controlling the total deformation rate to be 45.20% to obtain the final rolled piece. And (3) cooling the rolled piece after final rolling by adopting 1 section, controlling the total water quantity to be 1000m 3/h, starting 3 nozzles to cool under the water pressure of 0.63MPa, and reversely purging after the section to obtain the 6.5mm specification cooling-controlled round steel at 940 ℃. And (3) carrying out spinning on the rolled piece cooled to 940 ℃ after rolling at a speed of 97m/s to form a loose coil with a coil diameter line difference. The heat preservation cover on the loose coil conveying line is fully opened, the first section roller way speed is 0.90m/s, the first section roller way speed is 0.92m/s, the second section roller way speed is 0.94m/s, the third section roller way speed is 0.96m/s, the fourth section to last section roller way speed is 0.98m/s, a 1 #～7# fan is started for air cooling, the fan air quantity and the air speed are controlled to ensure the outlet temperature of the 1 # fan to 740 ℃, the outlet temperature of the 2 # fan to 620 ℃, and the outlet temperature of the 3 #～4# fan to: 632-639 ℃,5 # fan outlet temperature 550 ℃, 6 # fan outlet temperature 510 ℃ and 7 # fan outlet temperature 440 ℃. And collecting and bundling the loose coil after the 7# fan is discharged, and naturally cooling to room temperature in the process to obtain the high-carbon hard wire steel hot-rolled coil rod.
The prepared wire rod is subjected to performance and microscopic structure detection/inspection according to the standards of GB/T228.1 metal material tensile test, GB/T224 steel decarburized layer depth measurement method, GB/T13298 metal microscopic structure inspection method, YB/T169 high-carbon steel wire rod sorbite content metallographic detection method and the like. The results show that the high-carbon hard wire steel hot-rolled round wire rod of the parent metal for deep drawing high-strength steel wires prepared in the embodiment 1 has very light decarburization, the depth of a decarburized layer is 0.01mm, the metallographic structure is S+a small amount of P+a small amount of F, S accounts for 95%, P accounts for 3% and F accounts for 2% (see figure 1), the tensile strength is 960MPa, the area reduction rate is 70%, the same circle difference of the tensile strength is 12MPa, the product is naturally aged for 3 days, the high-strength steel wires with the specification phi of 1.2mm are drawn by a user, the production of the whole wire rod is smooth, no wire breakage is caused, and the use requirement of the user is completely met.
Example 2
The chemical components of the billet are ：C0.65%、Si0.38%、Mn0.56%、P≤0.015%、S≤0.015%、Mo≤0.008%、Cr≤0.046%、N≤0.0025%、O0.0016%、C+Si+Mn=1.59% 、C+Si+Mn+Mo+Cr=1.64%; percent by mass and the balance of Fe and unavoidable impurities.
The 165mm multiplied by 165mm cold square billet with the chemical composition meeting the requirements is sent into a heating furnace to be heated, the temperature of a preheating section is controlled to 852 ℃, the temperature of a heating section is controlled to 1071 ℃, the temperature of a soaking section is controlled to 1056 ℃, the steel billet stays in the soaking section for 37min, the total residence time of the steel billet in the heating furnace is controlled to 162min, the water pressure of 20MPa is adopted for the steel billet after the steel billet is discharged, the descaling speed of 0.2m/s is adopted to remove the iron scales on the surface of the steel billet, the steel billet with the initial rolling temperature of 982 ℃ is obtained to carry out eighteen-pass rough rolling and pre-finish rolling, and the rolling total reduction rate is 99.18%. And pre-cooling the rolled piece after exiting the pre-finishing mill group in 2 sections, wherein the total water volume is 1000m 3/h, the specific water volume is 1.0:1.0, 4 nozzles are opened in each section, the water pressure is 0.58MPa, cooling is carried out, and reverse purging is carried out after water cooling between sections, so that the finish rolling entering rolled piece at 948 ℃ is obtained. The rolled piece at 948 ℃ enters a finishing mill group to be rolled for 6 times, the rolling outlet speed is controlled to be 52m/s, and the total deformation rate of the finishing mill is 73.25%. And (3) cooling the finish-rolled piece in 3 sections, controlling the total water quantity to be 1000m 3/h and the specific water quantity to be 1.0:1.0:1.0, respectively starting 4, 3 and 3 nozzles for cooling under the water pressure of 0.57MPa in the three sections, and carrying out reverse purging after water cooling among the sections to obtain the finish-rolled cold-controlled rolled piece at 916 ℃. And (3) feeding the rolled piece cooled to 916 ℃ into a reducing sizing module rolling mill for 4 times, controlling the rolling outlet speed to be 96m/s, and controlling the total deformation rate to be 45.16 percent to obtain a final rolled piece. And (3) cooling the rolled piece after final rolling by adopting 1 section, controlling the total water quantity to be 1000m 3/h, starting 3 nozzles to cool under the water pressure of 0.63MPa, and reversely purging after the section to obtain the 6.5mm specification cooling-controlled round steel at 932 ℃. And (3) carrying out spinning on the rolled piece cooled to 932 ℃ after rolling at a speed of 97m/s to form loose rolls with a roll diameter line difference. The heat preservation shroud on the loose coil conveying line is fully opened, the first section roller way speed is 0.90m/s, the first section roller way speed is 0.92m/s, the second section roller way speed is 0.94m/s, the third section roller way speed is 0.96m/s, the fourth section to last section roller way speed is 0.98m/s, a 1 #～7# fan is started for air cooling, the fan air quantity and the air speed are controlled to ensure the outlet temperature of the 1 # fan to 735 ℃, the outlet temperature of the 2 # fan to 618 ℃ and the outlet temperature of the 3 #～4# fan to ensure the outlet temperature of the 1 # fan: 632-637 ℃,5 # fan outlet temperature 544 ℃, 6 # fan outlet temperature 507 ℃,7 # fan outlet temperature 436 ℃. And collecting and bundling the loose coil after the 7# fan is discharged, and naturally cooling to room temperature in the process to obtain the parent metal high-carbon hard wire steel hot-rolled round wire rod for deep drawing high-strength steel wires.
The performance and microstructure detection/inspection of the hot-rolled wire rod of the parent material high-carbon hard wire steel for deep drawing high-strength steel wires are carried out according to the standards of GB/T228.1 metal material tensile test, GB/T224 steel decarburized layer depth measuring method, GB/T13298 metal microstructure inspection method and the like. The result shows that the decarburization of the base metal high-carbon hard wire steel hot-rolled round wire rod for deep drawing high-strength steel wires prepared by the embodiment is very light, the decarburization layer depth is 0.02mm, the metallographic structure is S+a small amount of P+a small amount of F, S accounts for 93%, P accounts for 4% and F accounts for 3% (see figure 2), the tensile strength is 985MPa, the area shrinkage rate is 68%, the same circle difference of the tensile strength is 15MPa, the product is naturally aged for 3 days, the high-strength steel wires with the specification phi of 1.4mm are drawn by a user, the production of the whole wire rod is smooth, no wire breakage is caused, and the use requirement of the user is completely met.
Example 3
The chemical components of the billet are ：C0.60%、Si0.32%、Mn0.65%、P0.015%、S0.011%、Mo0.08%、Cr0.10%、N0.0030%、O0.0013%、C+Si+Mn=1.57% 、C+Si+Mn+Mo+Cr=1.75%; percent by mass and the balance of Fe and unavoidable impurities.
The 165mm multiplied by 165mm cold square billet with the chemical composition meeting the requirements is sent into a heating furnace to be heated, the temperature of a preheating section is controlled to 870 ℃, the temperature of a heating section is controlled to 1050 ℃, the temperature of a soaking section is controlled to 1030 ℃, the steel billet stays in the soaking section for 40min, the total residence time of the steel billet in the heating furnace is controlled to 180min, the water pressure of 20MPa and the descaling speed of 0.2m/s are adopted to remove the iron scales on the surface of the steel billet after the steel billet is discharged, the steel billet with the starting rolling temperature of 970 ℃ is obtained to carry out eighteen-pass rough rolling and pre-finish rolling, and the total rolling reduction rate is 99.05%. And pre-cooling the rolled piece after exiting the pre-finishing mill group in 2 sections, wherein the total water volume is 1000m 3/h, the specific water volume is 1.0:1.0, 4 nozzles are opened in each section, the water pressure is 0.57MPa, cooling is carried out, and reverse purging is carried out after water cooling between sections, so that the finished rolled piece entering the finish rolling mill at 940 ℃ is obtained. The rolled piece at 940 ℃ enters a finishing mill group to be rolled for 6 times, the rolling outlet speed is controlled to be 52m/s, and the total deformation rate of the finishing mill is 73.30%. And (3) cooling the finish-rolled piece in 3 sections, controlling the total water quantity to be 1000m 3/h and the specific water quantity to be 1.0:1.0:1.0, respectively starting 4, 3 and 3 nozzles for cooling under the water pressure of 0.56MPa in the three sections, and carrying out reverse purging after water cooling among the sections to obtain the finish-rolled cold-controlled rolled piece at 900 ℃. And (3) feeding the rolled piece cooled to 900 ℃ into a reducing sizing module rolling mill for 4 times, controlling the rolling outlet speed to be 96m/s, and controlling the total deformation rate to be 45.10 percent to obtain a final rolled piece. And (3) cooling the rolled piece after final rolling by adopting 1 section, controlling the total water quantity to be 1000m 3/h, starting 3 nozzles to cool under the water pressure of 0.62MPa, and reversely purging after the section to obtain the 6.5mm specification cooling-controlled round steel at 920 ℃. And (3) carrying out spinning on the rolled piece cooled to 920 ℃ after rolling at a speed of 97m/s to form a loose coil with a coil diameter line difference. The heat preservation cover on the loose coil conveying line is fully opened, the first section roller way speed is 0.90m/s, the first section roller way speed is 0.92m/s, the second section roller way speed is 0.94m/s, the third section roller way speed is 0.96m/s, the fourth section to last section roller way speed is 0.98m/s, a 1 #～7# fan is started for air cooling, the air quantity and the air speed of the fan are controlled to ensure the outlet temperature of the 1 # fan to 730 ℃, the outlet temperature of the 2 # fan to 610 ℃ and the outlet temperature of the 3 #～4# fan to ensure the outlet temperature of the 1 # fan: 630-636 ℃,5 # fan outlet temperature 540 ℃, 6 # fan outlet temperature 500 ℃ and 7 # fan outlet temperature 430 ℃. And collecting and bundling the loose coil after the 7# fan is discharged, and naturally cooling to room temperature in the process to obtain the parent metal high-carbon hard wire steel hot-rolled round wire rod for deep drawing high-strength steel wires.
The performance and microstructure detection/inspection of the hot-rolled wire rod of the parent material high-carbon hard wire steel for the deep-drawn high-strength steel wire is carried out according to the standards of GB/T228.1 metal material tensile test, GB/T224 steel decarburized layer depth measurement method, GB/T13298 metal microstructure inspection method, YB/T169 high-carbon steel wire rod sorbite content metallographic detection method and the like. The result shows that the hot rolled wire rod of the base metal steel for deep drawing high-strength steel wires prepared by the embodiment has very light decarburization, the depth of a decarburized layer is 0.01mm, the metallographic structure is S+little P+little F, S accounts for 90%, P accounts for 6% and F accounts for 4% (see figure 3), the tensile strength is 972MPa, the area reduction rate is 65%, the same circle difference of the tensile strength is 20MPa, the product is naturally aged for 3 days, the high-strength steel wires with the specification phi of 1.6mm are drawn by a user, the production of the wire rod is smooth, no wire breakage exists, and the use requirement of the user is completely met.
Claims (10)
1. The base metal high-carbon hard wire steel hot-rolled round wire rod for deep drawing of the high-strength steel wire is characterized by comprising the following chemical components in percentage by mass: 0.60 to 0.65 percent of C, 0.20 to 0.38 percent of Si, 0.45 to 0.65 percent of Mn, less than or equal to 0.015 percent of P, less than or equal to 0.015 percent of S, less than or equal to 0.010 percent of Mo, less than or equal to 0.10 percent of Cr, less than or equal to 0.0030 percent of N, and less than or equal to 0.0020 percent of O; and C+Si+Mn is more than or equal to 1.30%, C+Si+Mn+Mo+Cr is less than or equal to 1.75%; the balance of Fe and unavoidable impurities.
2. The base material high-carbon hard wire steel hot-rolled wire rod for deep drawing of a high-strength steel wire according to claim 1, wherein the nominal diameter of the high-carbon hard wire steel hot-rolled wire rod is 6.5mm.
3. The hot rolled steel wire rod of the parent metal high carbon hard wire for deep drawing high strength steel wires according to claim 1, wherein the depth of the decarburized layer of the hot rolled steel wire rod of the high carbon hard wire is less than or equal to 0.03mm, the metallographic structure is S+a small amount of P+a small amount of F, wherein S accounts for 90-95%, P < 6%, F < 5%, the tensile strength is 960-985 MPa, the area reduction rate is 65-70%, and the same circle difference of the tensile strength is less than or equal to 20MPa.
4. The method for preparing a hot rolled round bar of a parent material high-carbon hard wire steel for deep drawing high-strength steel wires according to claim 1, which is characterized by comprising the steps of billet heating, high-pressure water descaling, rough intermediate rolling and pre-finish rolling, pre-controlled cooling, finish rolling, controlled cooling after finish rolling, reducing sizing module rolling, controlled cooling after rolling, wire laying, air cooling, coil collecting and natural cooling;
In the billet heating procedure, the temperature of a preheating section is 830-870 ℃, the temperature of a heating section is 1050-1080 ℃, and the temperature of a soaking section is 1030-1060 ℃;
In the rough intermediate rolling and pre-finish rolling processes, the initial rolling temperature of a roughing mill is 970-990 ℃, the rolling is carried out for 18 times, and the total rolling reduction is 99.05-99.20%;
In the finish rolling process, the temperature of a finish rolling rolled piece is 940-960 ℃, the rolling is carried out for 6 times, the rolling outlet speed is controlled to be 51-52 m/s, and the total deformation rate of finish rolling is controlled to be 73.20-73.30%;
In the rolling process of the reducing sizing module rolling mill, the inlet temperature of a reducing sizing mill is 900-920 ℃, the rolling is performed for 4 times, the rolling outlet speed is controlled to be 95-96 m/s, and the total deformation rate is controlled to be 45.10-45.20%;
in the spinning step, spinning is performed at a spinning temperature of 920 to 940 ℃ at a speed of 97m/s to form a coil.
5. The method for producing a hot rolled wire rod of a parent material high carbon hard wire for deep drawing of a high strength steel wire according to claim 4, wherein the billet is a 165mm x 165mm square billet having the chemical composition by mass: 0.60 to 0.65 percent of C, 0.20 to 0.38 percent of Si, 0.45 to 0.65 percent of Mn, less than or equal to 0.015 percent of P, less than or equal to 0.015 percent of S, less than or equal to 0.010 percent of Mo, less than or equal to 0.10 percent of Cr, less than or equal to 0.0030 percent of N, and less than or equal to 0.0020 percent of O; and C+Si+Mn is more than or equal to 1.30%, C+Si+Mn+Mo+Cr is less than or equal to 1.75%; the balance of Fe and unavoidable impurities.
6. The method for producing a hot rolled wire rod of a parent metal high-carbon hard wire for deep drawing of a high-strength steel wire according to claim 4, wherein the pre-cooling step is to pre-cool a rolled piece after exiting a pre-finishing mill group in 2 stages, the total water content is 1000m 3/h, the specific water content is 1.0:1.0, 4 nozzles are opened for each stage, the water pressure is 0.57-0.58 MPa, and the cooling is performed after the water cooling between the stages.
7. The method for producing a hot rolled wire rod of a parent material high-carbon hard wire for deep drawing of a high-strength steel wire according to claim 4, wherein the post-finish rolling controlled cooling step is to cool a rolled product after finish rolling in 3 stages, the total water content is controlled to be 1000m 3/h, the specific water content is 1.0:1.0:1.0, and the three stages are cooled by respectively opening 4, 3 and 3 nozzles at a water pressure of 0.56 to 0.57MPa, and the reverse purging is performed after the water cooling between the stages.
8. The method for producing a hot rolled wire rod of a parent material high-carbon hard wire for deep drawing of a high-strength steel wire according to claim 4, wherein the post-rolling controlled cooling step is to cool a rolled product after finish rolling by 1 stage, the total water content is controlled to be 1000m 3/h, 3 nozzles are opened to cool the rolled product under a water pressure of 0.62 to 0.63MPa, and the rolled product is reversely purged after the stage.
9. The method for producing a hot rolled wire rod of a parent material high carbon hard wire for deep drawing of a high strength steel wire according to claim 4, wherein the air cooling process comprises the steps of: the heat preservation cover on the loose coil conveying line is fully opened, the first section roller way speed is 0.90m/s, the first section roller way speed is 0.92m/s, the second section roller way speed is 0.94m/s, the third section roller way speed is 0.96m/s, the fourth section to last section roller way speed is 0.98m/s, a1 #～7# fan is started for air cooling, the air quantity and the air speed of the fan are controlled to ensure that the outlet temperature of the 1 # fan is 730-740 ℃, the outlet temperature of the 2 # fan is 610-620 ℃, the outlet temperature of the 3 #～4# fan is 630-640 ℃, the outlet temperature of the 5 # fan is 540-550 ℃, the outlet temperature of the 6 # fan is 500-510 ℃, and the outlet temperature of the 7 # fan is 430-440 ℃.
10. The method according to claim 4, wherein in the heating step of the steel billet, the heated steel billet is held in the soaking section for 35 to 40 minutes, and the total holding time of the steel billet in the heating furnace is 150 to 180 minutes.
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