CN115537656B - High-carbon steel wire rod suitable for rapid deep drawing and iron scale control method - Google Patents
High-carbon steel wire rod suitable for rapid deep drawing and iron scale control method Download PDFInfo
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- CN115537656B CN115537656B CN202211132776.XA CN202211132776A CN115537656B CN 115537656 B CN115537656 B CN 115537656B CN 202211132776 A CN202211132776 A CN 202211132776A CN 115537656 B CN115537656 B CN 115537656B
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 90
- 229910000677 High-carbon steel Inorganic materials 0.000 title claims abstract description 49
- 229910052742 iron Inorganic materials 0.000 title claims description 40
- 238000000034 method Methods 0.000 title description 42
- 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 claims abstract description 11
- 238000002360 preparation method Methods 0.000 claims abstract description 10
- 239000000126 substance Substances 0.000 claims abstract description 10
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 9
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 8
- 239000012535 impurity Substances 0.000 claims abstract description 7
- 238000001816 cooling Methods 0.000 claims description 38
- 238000005266 casting Methods 0.000 claims description 36
- 238000005096 rolling process Methods 0.000 claims description 30
- 238000010438 heat treatment Methods 0.000 claims description 21
- 238000002791 soaking Methods 0.000 claims description 9
- 238000003723 Smelting Methods 0.000 claims description 8
- 239000000203 mixture Substances 0.000 claims description 6
- 238000007670 refining Methods 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- 229910001562 pearlite Inorganic materials 0.000 claims description 4
- 229910000831 Steel Inorganic materials 0.000 abstract description 17
- 239000010959 steel Substances 0.000 abstract description 17
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 abstract description 12
- 229910052799 carbon Inorganic materials 0.000 abstract description 9
- 229910052748 manganese Inorganic materials 0.000 abstract description 6
- 230000008569 process Effects 0.000 description 21
- 239000011651 chromium Substances 0.000 description 11
- 230000000052 comparative effect Effects 0.000 description 8
- 239000011572 manganese Substances 0.000 description 7
- 239000002253 acid Substances 0.000 description 6
- 230000009467 reduction Effects 0.000 description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 5
- 230000003647 oxidation Effects 0.000 description 5
- 238000007254 oxidation reaction Methods 0.000 description 5
- 238000005406 washing Methods 0.000 description 5
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 4
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- 229910052710 silicon Inorganic materials 0.000 description 4
- 239000010703 silicon Substances 0.000 description 4
- 238000009987 spinning Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 229910052909 inorganic silicate Inorganic materials 0.000 description 3
- 238000005554 pickling Methods 0.000 description 3
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 2
- 229910000754 Wrought iron Inorganic materials 0.000 description 2
- 230000004075 alteration Effects 0.000 description 2
- 229910052804 chromium Inorganic materials 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000005728 strengthening Methods 0.000 description 2
- 241001391944 Commicarpus scandens Species 0.000 description 1
- 229910015136 FeMn Inorganic materials 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000009749 continuous casting Methods 0.000 description 1
- 238000005536 corrosion prevention Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 229910052839 forsterite Inorganic materials 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- HCWCAKKEBCNQJP-UHFFFAOYSA-N magnesium orthosilicate Chemical compound [Mg+2].[Mg+2].[O-][Si]([O-])([O-])[O-] HCWCAKKEBCNQJP-UHFFFAOYSA-N 0.000 description 1
- 229910000473 manganese(VI) oxide Inorganic materials 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- OTYNBGDFCPCPOU-UHFFFAOYSA-N phosphane sulfane Chemical compound S.P[H] OTYNBGDFCPCPOU-UHFFFAOYSA-N 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 229910052814 silicon oxide Inorganic materials 0.000 description 1
- 238000004901 spalling Methods 0.000 description 1
- 238000005482 strain hardening Methods 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/04—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing
- C21D8/0405—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing of ferrous alloys
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/04—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing
- C21D8/0421—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing characterised by the working steps
- C21D8/0426—Hot rolling
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/04—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing
- C21D8/0447—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing characterised by the heat treatment
- C21D8/0463—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing characterised by the heat treatment following hot rolling
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
The invention particularly relates to a high-carbon steel wire rod and a preparation method thereof, which belong to the technical field of steel preparation, wherein the high-carbon steel wire rod comprises the following chemical components in percentage by mass: c:0.64% -0.75%, si:0.20% -0.30%, mn:0.60% -0.70%, P:0.005% -0.015%, S:0.003% -0.010%, cr:0.05% -0.15%, and the balance of Fe and unavoidable impurities; the narrow-range control is carried out on C, si and Mn, and a small amount of Cr element is added to ensure that the wire rod structure and mechanical property are suitable for quick drawing, and the addition of a small amount of Cr element can not only improve the hardenability of the wire rod, refine the structure and improve the sorbite lamellar spacing, but also be difficult to oxidize, and the Cr enriched at the interface can reduce the enrichment of Si oxide at the interface and improve the peeling property of the iron oxide scale interface.
Description
Technical Field
The invention belongs to the technical field of steel preparation, and particularly relates to a high-carbon steel wire rod and a preparation method thereof.
Background
The high-carbon steel wire rod is used as an important raw material in national economy production and is widely used in the industries of communication, roads, buildings, automobiles and the like. In the deep processing procedure of the high-carbon steel wire rod, the multi-pass drawing after the outer-layer iron sheet is removed is needed to obtain good material usability. Along with the progress of society, the requirements of people on environment and production efficiency are continuously improved, and the speed of single-pass continuous deep drawing is improved from 300-350 m/h to 700-1000 m/h aiming at the reduction rate of high-carbon steel. The improvement of the process equipment not only puts forward higher requirements on the performance of the wire rod, but also put forward higher requirements on the performance of the iron scale on the surface of the wire rod, the iron scale cannot fall off during transportation, good rust resistance is achieved, meanwhile, the iron scale on the surface is required to have excellent mechanical descaling performance, the mechanical descaling rate is more than 98%, acid washing is completely avoided, and the wire rod is not easy to break in the subsequent rapid deep drawing.
In the prior art, chinese patent application CN200810000916.1 discloses a control technology of hot rolled wire rod surface scale, which optimizes the thickness and structure of the hot rolled wire rod surface scale by controlling the stelmor cooling process flow, and is convenient for the treatment of the wire rod high-carbon steel hot rolled wire rod surface scale which is descaled by a mechanical shelling or mechanical shelling and pickling method; the Chinese patent application CN201510548416.1 discloses a control method of high-carbon steel wire rods and iron scales suitable for drawing fine steel wires, which ensures that the iron scales of the wire rods have good spalling property and adhesiveness through determining component proportion, smelting process, rolling process and cooling process, and meets the performance requirements of mechanical descaling and corrosion prevention; the invention patent application CN201610838557.1 discloses a flexible control method for the quality of iron scale of cord steel, which realizes the matching of physical parameters such as thickness, components, internal cracks, surface quality and the like of the iron scale through heating, rolling and cooling procedures, and is suitable for different iron scale outgoing modes such as direct pickling, mechanical descaling pickling-free, mechanical descaling+pickling and the like after the matching; the invention discloses a production method of an environment-friendly high-carbon wire rod iron scale of a Chinese patent application CN201711110220.X, which controls the thickness and the structure of the iron scale through chemical component proportion, rolling and cooling, so that the wire rod can achieve the aims of acid reduction and acid free washing. The main purpose of the control of the high-carbon steel wire rod iron scale in the prior art is acid washing reduction and acid washing free, and the method cannot meet the requirements of users, is completely acid washing free and is suitable for high-speed deep drawing.
Disclosure of Invention
The application aims to provide a high-carbon steel wire rod and a preparation method thereof, which are used for solving the problem that the existing high-carbon steel wire rod is not suitable for rapid deep drawing.
The embodiment of the invention provides a high-carbon steel wire rod, which comprises the following chemical components in percentage by mass:
C:0.64% -0.75%, si:0.20% -0.30%, mn:0.60% -0.70%, P:0.005% -0.015%, S:0.003% -0.010%, cr:0.05% -0.15%, and the balance of Fe and unavoidable impurities.
Optionally, the chemical components of the high-carbon steel wire rod comprise the following components in percentage by mass:
C:0.68% -0.71%, si:0.23% -0.27%, mn:0.63% -0.67%, P:0.008% -0.012%, S:0.005% -0.008%, cr:0.08% -0.12%, and the balance of Fe and unavoidable impurities.
Optionally, the microstructure of the high carbon steel wire rod includes: pearlite and sorbite, wherein the proportion of sorbite is greater than 95% by volume.
Optionally, the diameter of the high carbon steel wire rod is 5.5-6.5mm.
Based on the same inventive concept, the embodiment of the invention also provides a preparation method of the high-carbon steel wire rod, which comprises the following steps:
smelting molten iron in a converter, and refining and continuously casting to obtain a casting blank;
heating the casting blank to obtain a heated casting blank;
And rolling the heated casting blank, and cooling to obtain the high-carbon steel wire rod.
Optionally, the heating comprises a heating section and a soaking section, the temperature of the heating section is 900-1160 ℃, the temperature of the soaking section is 1100-1150 ℃, the time of the soaking section is 35-55min, and the total furnace time of the heating is 1.5-3h.
Optionally, before the heated casting blank is rolled, descaling is performed on the heated casting blank.
Optionally, the water pressure of the descaling is greater than 15MPa.
Optionally, the rolling comprises rough rolling, finish rolling and spinning, wherein the rolling start temperature of the rough rolling is 1000-1050 ℃, the inlet temperature of the finish rolling is 900-940 ℃, and the spinning temperature is 870-910 ℃.
Optionally, the cooling sequentially comprises a first section of cooling and a second section of cooling, the temperature value of the boundary point of the first section of cooling and the second section of cooling is 550-650 ℃, the cooling rate of the first section of cooling is 12-20 ℃/s, and the cooling rate of the second section of cooling is 3-8 ℃/s.
One or more technical solutions in the embodiments of the present invention at least have the following technical effects or advantages:
according to the high-carbon steel wire rod provided by the embodiment of the invention, the C, si and Mn are controlled in a narrow range, a small amount of Cr elements are added to ensure that the wire rod structure and the mechanical property are suitable for rapid drawing, the addition of a small amount of Cr elements can not only improve the hardenability of the wire rod and refine the structure and improve the sorbite lamellar spacing, but also be difficult to oxidize, and the Cr enriched at the interface can reduce the enrichment of Si oxide at the interface and improve the interface stripping property of iron oxide scale.
The foregoing description is only an overview of the present invention, and is intended to be implemented in accordance with the teachings of the present invention in order that the same may be more clearly understood and to make the same and other objects, features and advantages of the present invention more readily apparent.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a microscopic view of the scale morphology provided in example 1 of the present invention;
FIG. 2 is a microscopic view of the scale morphology provided in comparative example 2 of the present invention;
Fig. 3 is a flow chart of a method provided by an embodiment of the present invention.
Detailed Description
The advantages and various effects of the present invention will be more clearly apparent from the following detailed description and examples. It will be understood by those skilled in the art that these specific embodiments and examples are intended to illustrate the invention, not to limit the invention.
Throughout the specification, unless specifically indicated otherwise, the terms used herein should be understood as meaning as commonly used in the art. Accordingly, unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. In case of conflict, the present specification will control.
Unless otherwise specifically indicated, the various raw materials, reagents, instruments, equipment and the like used in the present invention are commercially available or may be prepared by existing methods.
The technical scheme of the embodiment of the application aims to solve the technical problems, and the overall thought is as follows:
According to an exemplary embodiment of the present invention, there is provided a high carbon steel wire rod having a chemical composition including, in mass fraction:
C:0.64% -0.75%, si:0.20% -0.30%, mn:0.60% -0.70%, P:0.005% -0.015%, S:0.003% -0.010%, cr:0.05% -0.15%, and the balance of Fe and unavoidable impurities.
The reason for designing the components in the invention is as follows:
Carbon is a major strengthening element in steel, and as the carbon content increases, the strength and work hardening rate of the steel are improved, the plasticity is lowered, and the deformation resistance is increased. On the basis of ensuring the strength, the reduction of the carbon content is beneficial to improving the toughness and cold workability of the steel. Meanwhile, CO gas is generated in the oxidation process of carbon, so that air holes in the iron sheet are easy to cause, the integral falling of the iron sheet is not easy to cause incomplete removal of the iron sheet, and the wire breakage rate is improved. Therefore, in order to make the iron scale of the high-carbon steel wire rod suitable for mechanical descaling, the carbon content of the wire rod is controlled to be 0.64% -0.75%.
Silicon is an important deoxidizing element in the smelting process of high-carbon steel wire rods. The low silicon content can lead to insufficient deoxidization of molten steel, the increase of the silicon content can form Fe 2SiO4 which is difficult to remove at the oxidation interface of the steel, and the Fe 2SiO4 is difficult to remove in the high-pressure water descaling and rolling processes. Therefore, the silicon content in the steel is controlled to be 0.20-0.30%.
Manganese is an element that increases the strength of the wire rod. In the high-temperature oxidation process, the manganese element and the iron scale easily form Fe 2MnO3, which is beneficial to the formation of the iron scale, improves the thickness of the iron scale and is beneficial to the mechanical descaling performance of the iron scale. However, too high manganese content tends to form a forsterite phase with silicon oxide (FeMn) 2SiO4 at the oxidation interface, reducing the scale removal properties of the scale. Therefore, the manganese content in the steel is controlled to be 0.60% -0.70%.
Phosphorus and sulfur are all harmful elements of steel, the content of which must be strictly controlled, otherwise the drawing performance of the wire rod is deteriorated. Thus, the phosphorus-sulfur content in the steel is P:0.005-0.015%, S:0.003-0.010%.
Chromium is an element for improving the strength of the wire rod, and a small amount of Cr element is added to improve the hardenability of the wire rod, refine the structure, improve the spacing between sorbite sheets, ensure that the wire rod structure and the mechanical property are suitable for quick drawing, meanwhile, cr is a difficult-to-oxidize element, and Cr enriched at an interface can reduce the enrichment of Si oxide at the interface and improve the interface stripping property of iron oxide scale. Therefore, the chromium content in the steel is controlled to be 0.05-0.15%.
In some embodiments, the chemical composition of the high carbon steel wire rod comprises, in mass fraction:
C:0.68% -0.71%, si:0.23% -0.27%, mn:0.63% -0.67%, P:0.008% -0.012%, S:0.005% -0.008%, cr:0.08% -0.12%, and the balance of Fe and unavoidable impurities.
In some embodiments, the microstructure of the high carbon steel wire rod comprises: pearlite and sorbite, wherein the proportion of sorbite is greater than 95% by volume.
The rapid deep drawing process requires single-pass reduction rate of 20-40%, single-pass continuous drawing reduction rate of 80-85%, drawing speed of 700-1000m/h, the high-carbon steel wire rod designed by the method meets the requirements of the rapid deep drawing process, the rapid deep drawing process is suitable for the rapid deep drawing process, in actual use, the diameter of the wire rod is limited according to user equipment and a deep processing process system, and in general, the diameter of the high-carbon steel wire rod suitable for the rapid deep drawing process is 5.5-6.5mm.
According to another exemplary embodiment of the invention, a preparation method of the high-carbon steel wire rod is provided, and the production process related to the method comprises the steps of molten iron, converter smelting, LF furnace refining, billet continuous casting, heating by a heating furnace, controlled rolling and controlled air cooling. Specifically, the method comprises the following steps:
s1, smelting molten iron in a converter, and refining and continuously casting to obtain a casting blank;
in this embodiment, the casting blank may be a 160mm 2 billet, and it should be noted that the purpose is merely to illustrate the casting blank, and not to limit the casting blank, and those skilled in the art will understand that a suitable casting blank size may be selected according to practical situations.
S2, heating the casting blank to obtain a heated casting blank;
The control method for the surface iron scale performance of the high-carbon steel wire rod suitable for rapid deep drawing is used for producing 160mm 2 billets, the temperature in the furnace cannot be controlled to be too high, the time cannot be too long, thicker composite oxides are prevented from being generated at the oxidation interface of the surface of a casting blank, and the composite oxides are difficult to clean. In some embodiments, the heating includes a heating section and a soaking section, the temperature of the heating section is 900-1160 ℃, the temperature of the soaking section is 1100-1150 ℃, the time of the soaking section is 35-55min, and the total furnace time of the heating is 1.5-3h.
And S3, rolling the heated casting blank, and cooling to obtain the high-carbon steel wire rod.
In some embodiments, the heated billet is descaled prior to rolling the heated billet.
The important function of the high-pressure water descaling is to remove primary iron scales formed in a heating furnace by a steel billet, and further, the water pressure of the descaling is more than 15MPa; the descaling water pressure is more than 15MPa, and the iron sheet is ensured to be removed cleanly.
The steel rolling process ensures that the iron scale on the surface of the finished wire rod product has reasonable thickness and phase structure, and is suitable for mechanical descaling. The spinning temperature is too low, and the iron scale on the surface of the wire rod is too thin, so that the wire rod is not suitable for mechanical shelling; the spinning temperature is too high, the oxide scale is too thick, and the surface residual oxide is too much after mechanical shelling, so that the method is not suitable for deep drawing. In some embodiments, the rolling includes rough rolling, finish rolling and laying, the rough rolling having an initial rolling temperature of 1000-1050 ℃, the finish rolling having an inlet temperature of 900-940 ℃, and the laying having a temperature of 870-910 ℃.
The cooling process ensures that the iron scale on the surface of the finished wire rod product has a reasonable phase structure, and is beneficial to mechanical shelling. In some embodiments, the cooling comprises a first stage cooling and a second stage cooling in sequence, wherein the temperature value of the boundary point of the first stage cooling and the second stage cooling is 550-650 ℃, the cooling rate of the first stage cooling is 12-20 ℃/s, and the cooling rate of the second stage cooling is 3-8 ℃/s.
The high-carbon steel wire rod produced by the method has the structure of pearlite and sorbite, the tensile strength range is 1050 MPa-1150 MPa, the area shrinkage is more than or equal to 55%, the thickness of the iron scale is 8-15 mu m, the FeO layer proportion in the iron scale is 60-70%, and the mechanical shelling rate of the iron scale is more than or equal to 98%.
The high carbon steel wire rod of the present application and the method of manufacturing the same will be described in detail with reference to examples, comparative examples and experimental data.
Examples 1 to 8
A preparation method of a high-carbon steel wire rod comprises the following steps:
s1, smelting molten iron in a converter, and refining and continuously casting to obtain a casting blank;
The chemical composition of the casting blank is shown in the following table:
| C，％ | Si，％ | Mn，％ | P，％ | S，％ | Cr，％ | |
| Example 1 | 0.64 | 0.27 | 0.65 | 0.008 | 0.007 | 0.07 |
| Example 2 | 0.68 | 0.25 | 0.68 | 0.010 | 0.006 | 0.07 |
| Example 3 | 0.72 | 0.26 | 0.63 | 0.010 | 0.008 | 0.10 |
| Example 4 | 0.75 | 0.30 | 0.66 | 0.010 | 0.005 | 0.12 |
| Example 5 | 0.65 | 0.25 | 0.65 | 0.009 | 0.005 | 0.09 |
| Example 6 | 0.68 | 0.27 | 0.68 | 0.012 | 0.006 | 0.07 |
| Example 7 | 0.72 | 0.26 | 0.63 | 0.010 | 0.008 | 0.10 |
| Example 8 | 0.75 | 0.26 | 0.70 | 0.010 | 0.005 | 0.12 |
S2, heating the casting blank to obtain a heated casting blank;
the process parameters of the step are shown in the following table:
and S3, rolling the heated casting blank, and cooling to obtain the high-carbon steel wire rod.
The process parameters of the step are shown in the following table:
Comparative examples 1 to 4
A preparation method of a high-carbon steel wire rod comprises the following steps:
s1, smelting molten iron in a converter, and refining and continuously casting to obtain a casting blank;
The chemical composition of the casting blank is shown in the following table:
| C，％ | Si，％ | Mn，％ | P，％ | S，％ | Cr，％ | |
| Comparative example 1 | 0.62 | 0.20 | 0.65 | 0.009 | 0.005 | 0.03 |
| Comparative example 2 | 0.76 | 0.30 | 0.68 | 0.012 | 0.008 | 0.15 |
| Comparative example 3 | 0.72 | 0.26 | 0.64 | 0.010 | 0.008 | 0.10 |
| Comparative example 4 | 0.70 | 0.26 | 0.65 | 0.010 | 0.005 | 0.12 |
S2, heating the casting blank to obtain a heated casting blank;
the process parameters of the step are shown in the following table:
and S3, rolling the heated casting blank, and cooling to obtain the high-carbon steel wire rod.
The process parameters of the step are shown in the following table:
Experimental example
The high carbon steel wire rods prepared in examples 1 to 8 and comparative examples 1 to 4 were examined, and the overall properties of the wire rods are shown in the following table.
As can be obtained from the table, the high-carbon steel wire rod prepared by the method provided by the embodiment of the application has the tensile strength ranging from 1050MPa to 1150MPa, the area shrinkage rate of more than or equal to 55%, the thickness of the iron scale of 8-15 mu m, the FeO layer proportion in the iron scale of 60-70%, and the mechanical shelling rate of the iron scale of more than or equal to 98%.
The drawing properties of the wire rods are shown in the following table.
From the table, the high-carbon steel wire rod prepared by the method provided by the embodiment of the application has the drawing wire breakage rate of less than 0.4 times per ton of steel in the rapid deep drawing process.
One or more technical solutions in the embodiments of the present invention at least have the following technical effects or advantages:
(1) According to the high-carbon steel wire rod provided by the embodiment of the invention, the C, si and Mn are controlled in a narrow range, a small amount of Cr elements are added to ensure that the wire rod structure and the mechanical property are suitable for rapid drawing, the addition of a small amount of Cr elements can not only improve the hardenability of the wire rod and refine the structure and improve the sorbite lamellar spacing, but also be difficult to oxidize, and meanwhile, cr enriched at the interface can reduce the enrichment of Si oxide at the interface and improve the interface stripping property of iron oxide scale;
(2) The method provided by the embodiment of the invention optimizes the tissue performance of the high-carbon steel wire rod, the thickness and the structure of the iron scale, controls the mechanical peeling rate of the iron scale to be more than 98%, ensures quick deep drawing after the pickling-free mechanical peeling, reduces the damage and the drawing defect of the grinding tool, and reduces the wire breakage rate.
Finally, it is also noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various modifications and variations can be made to the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Claims (2)
1. A high carbon steel wire rod, characterized in that the chemical composition of the high carbon steel wire rod comprises, in mass fraction:
C:0.64% -0.75%, si:0.20% -0.30%, mn:0.60% -0.70%, P:0.005% -0.015%, S:0.003% -0.010%, cr:0.05% -0.15%, and the balance of Fe and unavoidable impurities;
the microstructure of the high carbon steel wire rod comprises: pearlite and sorbite, wherein the proportion of sorbite is greater than 95% by volume;
The diameter of the high-carbon steel wire rod is 5.5-6.5mm;
the preparation method of the high-carbon steel wire rod comprises the following steps:
smelting molten iron in a converter, and refining and continuously casting to obtain a casting blank;
heating the casting blank to obtain a heated casting blank;
rolling the heated casting blank, and then cooling to obtain a high-carbon steel wire rod;
The heating comprises a heating section and a soaking section, wherein the temperature of the heating section is 900-1160 ℃, the temperature of the soaking section is 1100-1130 ℃, the time of the soaking section is 35-55min, and the total furnace time of the heating is 1.5-3h;
the rolling comprises rough rolling, finish rolling and wire laying, wherein the initial rolling temperature of the rough rolling is 1000-1050 ℃, the inlet temperature of the finish rolling is 900-940 ℃, and the wire laying temperature is 870-910 ℃;
Before the heated casting blank is rolled, descaling the heated casting blank;
the water pressure of the descaling is more than 15MPa;
the cooling sequentially comprises a first section of cooling and a second section of cooling, the temperature value of the boundary point of the first section of cooling and the second section of cooling is 550-650 ℃, the cooling rate of the first section of cooling is 12-20 ℃/s, and the cooling rate of the second section of cooling is 3-8 ℃/s.
2. The high carbon steel wire rod of claim 1, wherein the chemical composition of the high carbon steel wire rod comprises, in mass percent:
C:0.68% -0.71%, si:0.23% -0.27%, mn:0.63% -0.67%, P:0.008% -0.012%, S:0.005% -0.008%, cr:0.08% -0.12%, and the balance of Fe and unavoidable impurities.
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|---|---|---|---|---|
| US4702778A (en) * | 1985-01-28 | 1987-10-27 | Nippon Steel Corporation | Method for softening rolled medium carbon machine structural steels |
| JP2000087186A (en) * | 1998-09-14 | 2000-03-28 | Sumitomo Metal Ind Ltd | High carbon steel wire rod excellent in wire drawability, extra fine steel wire, and their production |
| CN102912101A (en) * | 2012-10-19 | 2013-02-06 | 攀钢集团成都钢钒有限公司 | Production process of 65 Mn spring steel wire rod and 65 Mn spring steel wire rod |
| CN109794515A (en) * | 2019-01-28 | 2019-05-24 | 东北大学 | A method of improving high-carbon steel wire rod iron scale mechanical stripping performance |
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2022
- 2022-09-13 CN CN202211132776.XA patent/CN115537656B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4702778A (en) * | 1985-01-28 | 1987-10-27 | Nippon Steel Corporation | Method for softening rolled medium carbon machine structural steels |
| JP2000087186A (en) * | 1998-09-14 | 2000-03-28 | Sumitomo Metal Ind Ltd | High carbon steel wire rod excellent in wire drawability, extra fine steel wire, and their production |
| CN102912101A (en) * | 2012-10-19 | 2013-02-06 | 攀钢集团成都钢钒有限公司 | Production process of 65 Mn spring steel wire rod and 65 Mn spring steel wire rod |
| CN109794515A (en) * | 2019-01-28 | 2019-05-24 | 东北大学 | A method of improving high-carbon steel wire rod iron scale mechanical stripping performance |
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| Title |
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| 崔风平等.中厚板生产知识问答.冶金工业出版社,2010,第26页. * |
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