CN114672737A - Wire rod and production method thereof - Google Patents
Wire rod and production method thereof Download PDFInfo
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- CN114672737A CN114672737A CN202210157689.3A CN202210157689A CN114672737A CN 114672737 A CN114672737 A CN 114672737A CN 202210157689 A CN202210157689 A CN 202210157689A CN 114672737 A CN114672737 A CN 114672737A
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- wire rod
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- annealing
- wire
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- 238000004519 manufacturing process Methods 0.000 title claims description 13
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 7
- 239000000956 alloy Substances 0.000 claims abstract description 7
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 7
- 239000000126 substance Substances 0.000 claims abstract description 5
- 239000012535 impurity Substances 0.000 claims abstract description 4
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 4
- 238000001816 cooling Methods 0.000 claims description 7
- 230000001681 protective effect Effects 0.000 claims description 6
- 238000005098 hot rolling Methods 0.000 claims description 3
- 238000010079 rubber tapping Methods 0.000 claims description 3
- 238000000137 annealing Methods 0.000 abstract description 16
- 229910000831 Steel Inorganic materials 0.000 description 17
- 239000010959 steel Substances 0.000 description 17
- 229910052799 carbon Inorganic materials 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000007670 refining Methods 0.000 description 3
- 238000010583 slow cooling Methods 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 238000009987 spinning Methods 0.000 description 2
- 229910001339 C alloy Inorganic materials 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 238000010273 cold forging Methods 0.000 description 1
- 238000009749 continuous casting Methods 0.000 description 1
- 238000005261 decarburization Methods 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 229910000859 α-Fe Inorganic materials 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
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/16—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling wire rods, bars, merchant bars, rounds wire or material of like small cross-section
-
- 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
-
- 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
-
- 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
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Strip Materials And Filament Materials (AREA)
Abstract
The invention relates to a wire, which comprises the following chemical components in percentage by mass: 0.20% -0.30%, Mn: 0.30% -0.60%, Cr: 1.25-1.35%, P is less than or equal to 0.015%, S is less than or equal to 0.015%, B: 0.001% -0.003%, N is less than or equal to 0.004%, Ti: 0.02% -0.04%, Al: 0.01 to 0.05 percent of the total weight of the alloy, and the balance of Fe and inevitable impurity elements. The wire rod can be used for producing fastener products with strength grade of more than 10.9, and can achieve simplified annealing or no annealing, and the simplified annealing or no annealing is selected according to the complexity of the fastener products.
Description
Technical Field
The invention belongs to the field of steel wire production, and particularly relates to the technical field of high-strength cold forging steel.
Background
Low alloy Cr-containing steels, represented by SCM435 and SCM440, require wire rod modification, also called wire rod refining, before cold forming and upsetting of bolts because of their high strength. The purpose of wire rod refining is to improve the cold heading performance of hot-rolled wire rods, the wire rod structure is converted into a spheroidized structure through heat treatment, and meanwhile, the out-of-roundness of the wire rod surface is reduced and is commonly called as rounding. The spheroidized structure is the structure most suitable for cold heading forming. Due to the high strength of the SCM435 material, annealing, which may be softening annealing and spheroidizing annealing, is needed first in the process of drawing modification.
SCM435, SCM440 and even ML40Cr parts need to be annealed and then drawn. And is unfavorable for cold heading due to the high alloy content. SCM435, SCM440 are generally not capable of producing more complex parts.
In addition, the low-temperature performance of the SCM435 and the SCM440 cannot be guaranteed.
The elements influencing cold heading are generally considered to be mainly Si and N elements, but the existing high-strength cold heading designs are generally alloy cold heading steels containing Si, such as SCM435 series and the like. On the other hand, the amount of N element in steel is reduced as much as possible because N element is generally controlled by manufacturers but is not controlled to an extremely low level, and because N element is easily formed as inclusions by solidification through addition of Ti.
The effect of various alloy elements on cold heading is as follows:
c: carbon is added into steel, mainly forms carbide, improves the strength of the steel and is unfavorable for cold heading performance. The carbon content of the high strength steel is 0.30% or more, but if the carbon content can be controlled to 0.30% or less, the steel is advantageous in cold heading property.
Si: si content is unfavorable for cold heading, the strength of ferrite is improved, and cold heading property is also unfavorable even after annealing.
Mn: the main effect is to improve hardenability, but the content is unfavorable to cold heading.
P is unfavorable to cold heading, improves strength, and has adverse effects on plasticity and low-temperature performance.
S: can be combined with Mn, and the surface quality is not good when the content is high.
Cr: can provide hardenability, increase comprehensive mechanical properties and have small influence on cold heading.
Ni: improve low temperature performance, hardenability, and have little influence on cold heading.
B, improving hardenability, but the effect is reduced when the carbon content is high.
Ti: the N element in the steel is fixed and can be combined with C to refine grains.
Patent application No. CN202110270159.5 discloses a cold heading steel wire rod for non-annealed 10.9 grade fastener, which mainly comprises the following chemical components: 0.25-0.29%, Mn0.95-1.15%, Cr: 0.40-0.50%, which is a design idea of high Mn and low Cr, but the cold heading property is not particularly ideal. The patent of application number CN202010246596.9 discloses a production method of annealing-free medium carbon alloy cold heading steel, which is a high-carbon high-Cr steel grade and mainly adopts a low-temperature rolling and delayed slow cooling mode. The patent application No. CN202110147300.2 discloses a low-strength annealing-free manufacturing method, which is low in strength and is also a high-Mn low-Cr composition design.
In order to simplify the processing technology of downstream customers, the invention provides a special cold heading steel grade beneficial to cold heading, which can simplify the downstream annealing process and even achieve the aim of annealing-free direct cold heading.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a wire rod and a production method thereof, which simplify or omit an annealing process in the wire rod refining process and reduce the production cost.
The technical scheme of the invention is as follows: a wire comprises the following chemical components in percentage by mass: 0.20% -0.30%, Mn: 0.30% -0.60%, Cr: 1.25-1.35%, P is less than or equal to 0.015%, S is less than or equal to 0.015%, B: 0.001% -0.003%, N is less than or equal to 0.004%, Ti: 0.02% -0.04%, Al: 0.01 to 0.05 percent of the total weight of the alloy, and the balance of Fe and inevitable impurity elements.
Furthermore, the wire rod also contains Ni with the mass percentage of 0.01-0.40%.
The production method of the wire rod comprises the steps of hot rolling the wire rod, collecting coils after spinning, slowly cooling the collected coils in a tunnel furnace at a cooling speed of less than or equal to 0.5 ℃/s and at a tapping temperature of less than 400 ℃.
Further, protective atmosphere is introduced into the tunnel furnace, wherein the protective atmosphere is N2。
Further, the bundling temperature of the bundling is 860 +/-20 ℃.
The tunnel furnace is similar to a tunnel in shape, has a heat preservation function, and can reduce the cooling speed of the wire rod. The tunnel furnace adjusts the cooling rate of the wire rod by adjusting the temperature in the furnace and the traveling speed of the wire rod in the furnace.
According to the invention, nitrogen is introduced into the tunnel furnace, so that decarburization of the wire rod can be avoided.
The design principle of the components and the content of the wire rod of the invention is as follows: the cold heading property of steel is improved by controlling the contents of Si, N, Mn and C, Cr and Ni elements are added to ensure sufficient strength, and B elements are added to improve hardenability.
The design principle of the wire production method of the invention is as follows: in order to obtain the wire with low strength, the wire can be directly subjected to cold heading or simplified annealing, the wire directly enters a tunnel furnace for cooling after being rolled, and the aim of reducing the strength of the hot-rolled wire is achieved through slow cooling.
Adopt the produced beneficial effect of above-mentioned technical scheme to lie in:
the wire rod can be used for producing fastener products with strength grade of more than 10.9, and can achieve simplified annealing or no annealing, and the simplified annealing or no annealing is selected according to the complexity of the fastener products.
Detailed Description
The wire rod production is carried out by a blast furnace-converter-LF-RH-continuous casting-cogging-rolling process, and a billet with the following components is obtained by a continuous casting process: c: 0.20% -0.30%, Mn: 0.30% -0.60%, Cr: 1.25-1.35%, P is less than or equal to 0.015%, S is less than or equal to 0.015%, B: 0.001% -0.003%, N is less than or equal to 0.004%, Ti: 0.02% -0.04%, Al: 0.01 to 0.05 percent of Ni, 0 to 0.40 percent of Ni, and the balance of Fe and inevitable impurity elements. The steel billet is hot-rolled into a wire rod after cogging, the wire rod is hot-rolled, the wire rod is coiled immediately after spinning, the coiling temperature is 860 +/-20 ℃, the coiled wire rod enters a tunnel furnace for slow cooling after being coiled, the cooling speed is controlled to be less than or equal to 0.5 ℃/s, and the tapping temperature is controlled to be less than 400 ℃. Introducing a protective atmosphere into the tunnel furnace, wherein the protective atmosphere is N 2。
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Examples 1 to 5
The chemical components and the mass percentage of the steel billet are shown in the following table 1, and the process parameters of the hot rolling process are shown in the table 2.
TABLE 1
TABLE 2
The wire rods obtained in examples 1 to 5 were used to produce fastener products, the types and strength grades of the fasteners produced are shown in Table 3, the wire annealing conditions before cold heading for making the fasteners are shown in Table 3, and the mechanical properties of the fasteners are shown in Table 3.
TABLE 3
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 (5)
1. A wire comprises the following chemical components in percentage by mass: 0.20% -0.30%, Mn: 0.30% -0.60%, Cr: 1.25-1.35%, P is less than or equal to 0.015%, S is less than or equal to 0.015%, B: 0.001% -0.003%, N is less than or equal to 0.004%, Ti: 0.02% -0.04%, Al: 0.01 to 0.05 percent of the total weight of the alloy, and the balance of Fe and inevitable impurity elements.
2. The wire rod of claim 1, wherein the wire rod further comprises Ni in an amount of 0.01 to 0.40% by mass.
3. The method for producing a wire rod according to any one of claims 1 or 2, wherein in the wire rod hot rolling process, the wire rod is coiled after being spun, the wire rod is slowly cooled in a tunnel furnace after being coiled, the cooling speed is controlled to be less than or equal to 0.5 ℃/s, and the tapping temperature is controlled to be less than 400 ℃.
4. The method for producing the wire rod as claimed in claim 3, wherein a protective atmosphere is introduced into the tunnel furnace, wherein the protective atmosphere is N2。
5. A method for producing a wire rod as claimed in claim 3, wherein the reform, reform temperature is 860 ± 20 ℃.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111582046 | 2021-12-22 | ||
| CN2021115820465 | 2021-12-22 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114672737A true CN114672737A (en) | 2022-06-28 |
Family
ID=82072817
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210157689.3A Pending CN114672737A (en) | 2021-12-22 | 2022-02-21 | Wire rod and production method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114672737A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09291312A (en) * | 1996-04-26 | 1997-11-11 | Kobe Steel Ltd | Production of high strength non-heat treated wire rod for bolt |
| CN101775546A (en) * | 2010-03-19 | 2010-07-14 | 江苏省沙钢钢铁研究院有限公司 | High strength boron-containing cold heading steel for fastener and preparation process thereof |
| CN104674123A (en) * | 2015-02-12 | 2015-06-03 | 江苏省沙钢钢铁研究院有限公司 | Wire rod for spheroidizing annealing-free and corrosion-resistant fastener and preparation method thereof |
| WO2017171070A1 (en) * | 2016-03-31 | 2017-10-05 | 株式会社神戸製鋼所 | High-strength hot-rolled wire rod having excellent sulfide stress corrosion cracking resistance |
| CN109023112A (en) * | 2018-09-28 | 2018-12-18 | 邢台钢铁有限责任公司 | High-strength weather-resistant cold-forging steel and preparation method thereof |
| CN113025917A (en) * | 2021-02-03 | 2021-06-25 | 江阴兴澄合金材料有限公司 | Wire rod for low-strength high-plasticity annealing-free cold forging steel and manufacturing method thereof |
-
2022
- 2022-02-21 CN CN202210157689.3A patent/CN114672737A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09291312A (en) * | 1996-04-26 | 1997-11-11 | Kobe Steel Ltd | Production of high strength non-heat treated wire rod for bolt |
| CN101775546A (en) * | 2010-03-19 | 2010-07-14 | 江苏省沙钢钢铁研究院有限公司 | High strength boron-containing cold heading steel for fastener and preparation process thereof |
| CN104674123A (en) * | 2015-02-12 | 2015-06-03 | 江苏省沙钢钢铁研究院有限公司 | Wire rod for spheroidizing annealing-free and corrosion-resistant fastener and preparation method thereof |
| WO2017171070A1 (en) * | 2016-03-31 | 2017-10-05 | 株式会社神戸製鋼所 | High-strength hot-rolled wire rod having excellent sulfide stress corrosion cracking resistance |
| CN109023112A (en) * | 2018-09-28 | 2018-12-18 | 邢台钢铁有限责任公司 | High-strength weather-resistant cold-forging steel and preparation method thereof |
| CN113025917A (en) * | 2021-02-03 | 2021-06-25 | 江阴兴澄合金材料有限公司 | Wire rod for low-strength high-plasticity annealing-free cold forging steel and manufacturing method thereof |
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Application publication date: 20220628 |