CN112718879A - Production method of pure iron wire rod capable of avoiding crystal grain coarsening - Google Patents
Production method of pure iron wire rod capable of avoiding crystal grain coarsening Download PDFInfo
- Publication number
- CN112718879A CN112718879A CN202011371141.6A CN202011371141A CN112718879A CN 112718879 A CN112718879 A CN 112718879A CN 202011371141 A CN202011371141 A CN 202011371141A CN 112718879 A CN112718879 A CN 112718879A
- Authority
- CN
- China
- Prior art keywords
- heating
- billet
- section
- pure iron
- temperature
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
-
- 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
Abstract
The invention relates to a production method of a pure iron wire rod capable of avoiding coarse grains, which comprises the working procedures of billet heating, rolling control, cooling control and billet heating, wherein the billet is heated by a regenerative heating furnace, the billet is heated in the heating furnace in three sections, the preheating section, the heating section and the soaking section are sequentially arranged from the inlet to the outlet of the heating furnace, the heating temperature of the soaking section is 1100-. The grain size of the pure iron billet obtained by the production method is in a uniform state of 1.5 grade, and the grain size of a finished product which is normally rolled can be uniformly controlled to be about 4 grade.
Description
Technical Field
The invention belongs to the technical field of steel wire rolling, and particularly relates to a production method of a pure iron wire capable of avoiding coarse grains.
Background
The pure iron wire comprises alloy DT4, CH1T, XGM6-1 and the like, and is mainly used for manufacturing elements such as electromagnetic elements, electromagnetic cores and the like in the industries of electric appliances, telecommunication, instruments and national defense. The product has the advantages of stable components, low harmful elements, high steel purity, high surface quality, high geometric dimension precision and the like, and has good electromagnetic and low coercive force performances. With the rapid development of global science and technology, pure iron has been widely applied to basic industries such as daily life, electric power, machinery, traffic, metallurgy and the like, and becomes the material basis of high-technology industries such as electronics, computers, communication and the like in modern society. In recent years, with the continuous development of the pure iron material industry in China and the continuous innovation of the preparation technology, China gradually becomes a large world for producing pure iron material products, and various pure iron material products begin to be exported to the international market in large quantities, thereby forming great international influence. At present, the research on improving the purity of pure iron and the research on ultra-pure iron are more concentrated in the direction of pure iron steel, the research on the surface quality and the processing performance of the pure iron is neglected, so that the defects of surface pits and pockmarks frequently appear in the processing process of a user, and the processing efficiency of the user is seriously influenced. The research shows that the root cause of the surface defects is the local coarseness of the crystal grains on the surface of the wire rod. Local grains are thick, so that local deformation is uneven, damage is generated in the subsequent drawing process of a client to form pits, and the use of the client is influenced. With the ever-increasing market share of pure iron steel grades in China, it is very important to meet the processing and using requirements of customers, so the problem of local coarse grains needs to be solved urgently.
Disclosure of Invention
The invention aims to provide a method for producing a pure iron wire rod capable of avoiding coarse grains, which can avoid the coarse local grains of the pure iron wire rod while ensuring good conductivity, and improve the grain size uniformity of the pure iron wire rod so as to solve the defects of pits and pockmarks generated in the drawing process of a user.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows: a production method of a pure iron wire rod capable of avoiding coarse grains comprises the processes of billet heating, rolling control and cooling control, wherein in the billet heating process, a heat accumulating type heating furnace is adopted for heating billets, the billets are heated in the heating furnace in three sections, and a preheating section, a heating section and a soaking section are sequentially arranged from an inlet to an outlet of the heating furnace, and the production method is characterized in that the heating temperature of the soaking section is 1100-1200 ℃, and the heating time of the soaking section is 30-80 min.
In the heating process of the pure iron type heating furnace, under the combined action of the heating temperature and the heating time, the phenomenon of grain growth inevitably exists. It is generally believed that after crystallization is complete, the normally grown grains should be uniform and continuous. Experimental research shows that the grains of the pure iron steel have an abnormally-grown secondary recrystallization phenomenon in the heating process of the heating furnace, and in this case, the grains grow only by a few grains which are suddenly and rapidly coarsened, so that the size difference between the grains is larger and larger, and the problem of local coarsening of the grains is caused in the subsequent rolling process.
When the heating temperature is higher than 1000 ℃, the secondary recrystallization phenomenon can be caused by continuously increasing the heating time. The higher the heating temperature, the shorter the time required for the secondary recrystallization thereof to occur. In the heat preservation process of the heating furnace, the crystal grains of the billet have similar rules under different heating temperatures, namely, the initial crystal grains grow rapidly, the later crystal grains grow slowly, a buffer zone exists, and the later crystal grains have the tendency of growing rapidly. When the grain size of the original billet reaches 0.5 grade or below, the grain size is not easy to eliminate in the dynamic recrystallization process of subsequent rolling, and finally the problem of local coarse grains of the finished wire rod is caused.
Therefore, in order to avoid the problem of local crystal grain coarseness of the finished product, the heating temperature and heating time are preferably selected to avoid the occurrence of secondary recrystallization. Meanwhile, the heating temperature and the heating time are selected to ensure that a high temperature section and a heat preservation time are selected as long as possible on the premise that no secondary recrystallization occurs, because the original crystal grains of the billet are too small due to heating in a low temperature section or insufficient heat preservation time. If the original crystal grains of the billet are too small, the crystal grains can be further refined in the subsequent rolling dynamic recrystallization stage, so that the conductivity of the finished product is reduced, and the service performance of the finished product is influenced. Therefore, in order to ensure the effective heat preservation temperature and heat preservation time of the steel billet in the heating furnace and simultaneously consider the influence of production cost, the soaking temperature is 1100-1200 ℃, and the soaking time is controlled to be 30-80 min.
Preferably, the heating temperature of the soaking section is 1100-1180 ℃, and the heating time of the soaking section is 30-60 min.
Further, the heating temperature of the preheating section is 700-.
Further, in the controlled rolling process, the temperature of a finishing mill is 930 +/-20 ℃, and the spinning temperature is 880 +/-20 ℃; and the cooling process is controlled, the heat-insulating cover is completely closed, and the fan is completely closed.
Adopt the produced beneficial effect of above-mentioned technical scheme to lie in:
the grain size of the pure iron billet is in a uniform state of 1.5 grade, and the grain size of a finished product which is normally rolled can be uniformly controlled to be about 4 grade.
Drawings
FIG. 1 is a metallographic photograph of the grain size of a heated billet of example 1;
FIG. 2 is a metallographic photograph of the grain size of the heated billet of example 2;
FIG. 3 is a metallographic photograph of the grain size of the heated billet of example 3;
FIG. 4 is a metallographic photograph of the grain size of the steel billet after heating in example 4.
Detailed Description
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.
In order to better illustrate the invention, the following examples are given by way of further illustration.
Example 1
The size of a pure iron billet is 160mm multiplied by 160mm, the production process comprises the steps of billet heating, rolling control, cooling control and billet heating, wherein the billet is heated by a regenerative heating furnace, the billet is heated in the heating furnace in three sections, and the preheating section, the heating section and the soaking section are sequentially arranged from the inlet to the outlet of the heating furnace, the heating temperature of the preheating section is 700 ℃, the heating temperature of the heating section is 1100 ℃, the heating temperature of the soaking section is 1100 ℃, the heating time of the soaking section is 80min, the total heating time of the heating furnace is 240min, the rolling process is controlled, the temperature of the billet entering a finishing mill is 910 ℃, and the; and controlling the cooling process, completely closing the heat-insulating cover and completely closing the fan.
Example 2
The size of a pure iron billet is 160mm multiplied by 160mm, the production process comprises the steps of billet heating, rolling control, cooling control and billet heating, wherein the billet is heated by a regenerative heating furnace, the billet is heated in the heating furnace in three sections, and the preheating section, the heating section and the soaking section are sequentially arranged from the inlet to the outlet of the heating furnace, the heating temperature of the preheating section is 750 ℃, the heating temperature of the heating section is 1118 ℃, the heating temperature of the soaking section is 1121 ℃, the heating time of the soaking section is 69min, the total heating time of the heating furnace is 196min, the rolling process is controlled, the temperature of the billet entering a finishing mill is 920 ℃, and the; and controlling the cooling process, completely closing the heat-insulating cover and completely closing the fan.
Example 3
The size of a pure iron billet is 160mm multiplied by 160mm, the production process comprises the steps of billet heating, rolling control, cooling control and billet heating, wherein the billet is heated by a regenerative heating furnace, the billet is heated in the heating furnace in three sections, and the preheating section, the heating section and the soaking section are sequentially arranged from the inlet to the outlet of the heating furnace, the heating temperature of the preheating section is 759 ℃, the heating temperature of the heating section is 1138 ℃, the heating temperature of the soaking section is 1141 ℃, the heating time of the soaking section is 53min, the total heating time of the heating furnace is 144min, the rolling process is controlled, the temperature of the pure iron billet enters a finishing mill is 930 ℃; and controlling the cooling process, completely closing the heat-insulating cover and completely closing the fan.
Example 4
The size of a pure iron billet is 160mm multiplied by 160mm, the production process comprises the steps of billet heating, rolling control, cooling control and billet heating, the billet is heated by a regenerative heating furnace, the billet is heated in the heating furnace in three sections, a preheating section, a heating section and a soaking section are sequentially arranged from the inlet to the outlet of the heating furnace, the heating temperature of the preheating section is 800 ℃, the heating temperature of the heating section is 1152 ℃, the heating temperature of the soaking section is 1152 ℃, the heating time of the soaking section is 44min, the total heating time of the heating furnace is 108min, the rolling process is controlled, the temperature of the billet entering a finishing mill is 950 ℃, and the spinning temperature; and controlling the cooling process, completely closing the heat-insulating cover and completely closing the fan.
Example 5
The size of a pure iron billet is 160mm multiplied by 160mm, the production process comprises the steps of billet heating, rolling control, cooling control and billet heating, wherein the billet is heated by a regenerative heating furnace, the billet is heated in the heating furnace in three sections, and the preheating section, the heating section and the soaking section are sequentially arranged from the inlet to the outlet of the heating furnace, the heating temperature of the preheating section is 769 ℃, the heating temperature of the heating section is 1167 ℃, the heating temperature of the soaking section is 1181 ℃, the heating time of the soaking section is 38min, the total heating time of the heating furnace is 96min, the rolling process is controlled, the temperature of the pure iron billet enters a finishing mill is 936 ℃, and; and controlling the cooling process, completely closing the heat-insulating cover and completely closing the fan.
Example 6
The size of a pure iron billet is 160mm multiplied by 160mm, the production process comprises the steps of billet heating, rolling control, cooling control and billet heating, wherein the billet is heated by a regenerative heating furnace, the billet is heated in the heating furnace in three sections, namely a preheating section, a heating section and a soaking section from the inlet to the outlet of the heating furnace, the heating temperature of the preheating section is 795 ℃, the heating temperature of the heating section is 1180 ℃, the heating temperature of the soaking section is 1200 ℃, the heating time of the soaking section is 30min, the total heating time of the heating furnace is 80min, the rolling process is controlled, the temperature of the finishing mill is 942 ℃, and the spinning temperature is 892 ℃; and controlling the cooling process, completely closing the heat-insulating cover and completely closing the fan.
The grain size of the heated billets of examples 1-6 were examined and the results are shown in Table 1. FIGS. 1-4 are metallographic photographs of the grain size of the heated billets of examples 1-4.
TABLE 1
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 (4)
1. A production method of a pure iron wire rod capable of avoiding coarse grains comprises the processes of billet heating, rolling control and cooling control, wherein in the billet heating process, a heat accumulating type heating furnace is adopted for heating billets, the billets are heated in the heating furnace in three sections, and a preheating section, a heating section and a soaking section are sequentially arranged from an inlet to an outlet of the heating furnace, and the production method is characterized in that the heating temperature of the soaking section is 1100-1200 ℃, and the heating time of the soaking section is 30-80 min.
2. The method for producing pure iron wire rod without coarsening of crystal grains as claimed in claim 1, wherein the heating temperature of the soaking section is 1100-1180 ℃, and the heating time of the soaking section is 30-60 min.
3. The method as claimed in claim 1, wherein the preheating zone is heated at a temperature of 700-.
4. A method for producing a pure iron wire rod avoiding grain coarsening according to any one of claims 1 to 3, wherein the rolling process is controlled such that the finishing mill temperature is 930 ± 20 ℃ and the spinning temperature is 880 ± 20 ℃; and the cooling process is controlled, the heat-insulating cover is completely closed, and the fan is completely closed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011371141.6A CN112718879A (en) | 2020-11-30 | 2020-11-30 | Production method of pure iron wire rod capable of avoiding crystal grain coarsening |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011371141.6A CN112718879A (en) | 2020-11-30 | 2020-11-30 | Production method of pure iron wire rod capable of avoiding crystal grain coarsening |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112718879A true CN112718879A (en) | 2021-04-30 |
Family
ID=75597975
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011371141.6A Pending CN112718879A (en) | 2020-11-30 | 2020-11-30 | Production method of pure iron wire rod capable of avoiding crystal grain coarsening |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112718879A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115418579A (en) * | 2022-08-02 | 2022-12-02 | 邢台钢铁有限责任公司 | Production method of super electromagnetic pure iron DT4C high-speed wire |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103506383A (en) * | 2013-09-26 | 2014-01-15 | 山西太钢不锈钢股份有限公司 | Method for hot-rolling manufacture of ultra-pure ferrite stainless steel |
| CN105420601A (en) * | 2015-12-11 | 2016-03-23 | 武汉钢铁(集团)公司 | Production method of high-plasticity steel wire rod for welding |
| KR101787287B1 (en) * | 2016-10-21 | 2017-10-19 | 현대제철 주식회사 | High strength steel deformed bar and method of manufacturing the same |
| CN108906884A (en) * | 2018-06-22 | 2018-11-30 | 大冶特殊钢股份有限公司 | A kind of zerolling production method of high-performance 20CrMnTi pinion steel |
| CN109112246A (en) * | 2017-06-26 | 2019-01-01 | 鞍钢股份有限公司 | A kind of production method of the railway spring-fastener steel wire rod of direct cold roll forming |
-
2020
- 2020-11-30 CN CN202011371141.6A patent/CN112718879A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103506383A (en) * | 2013-09-26 | 2014-01-15 | 山西太钢不锈钢股份有限公司 | Method for hot-rolling manufacture of ultra-pure ferrite stainless steel |
| CN105420601A (en) * | 2015-12-11 | 2016-03-23 | 武汉钢铁(集团)公司 | Production method of high-plasticity steel wire rod for welding |
| KR101787287B1 (en) * | 2016-10-21 | 2017-10-19 | 현대제철 주식회사 | High strength steel deformed bar and method of manufacturing the same |
| CN109112246A (en) * | 2017-06-26 | 2019-01-01 | 鞍钢股份有限公司 | A kind of production method of the railway spring-fastener steel wire rod of direct cold roll forming |
| CN108906884A (en) * | 2018-06-22 | 2018-11-30 | 大冶特殊钢股份有限公司 | A kind of zerolling production method of high-performance 20CrMnTi pinion steel |
Non-Patent Citations (1)
| Title |
|---|
| 钟卫佳: "《铜加工技术实用手册》", 31 January 2007, 冶金工业出版社 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115418579A (en) * | 2022-08-02 | 2022-12-02 | 邢台钢铁有限责任公司 | Production method of super electromagnetic pure iron DT4C high-speed wire |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111197148B (en) | Method for manufacturing target material | |
| CN111334727B (en) | Preparation method of high-temperature alloy wire for improving yield of high-temperature alloy rivet | |
| CN111872113B (en) | Medium-high carbon steel hot-rolled wire rod and production method thereof | |
| CN114161028B (en) | Processing method for improving performance of titanium alloy welding wire | |
| CN112589022A (en) | Method for manufacturing high-quality low-segregation fine-grain high-temperature alloy bar difficult to deform | |
| CN112048682B (en) | Processing heat treatment process for medium-entropy alloy plate | |
| CN111495970A (en) | Rolling method for reducing surface cracking of TC4 titanium alloy smelted in EB (electron beam) furnace | |
| CN112718879A (en) | Production method of pure iron wire rod capable of avoiding crystal grain coarsening | |
| CN110976512A (en) | Cold rolling method for TC4 titanium alloy wire | |
| CN110819781B (en) | High-speed steel wire circulation heat treatment method | |
| CN110735068B (en) | Preparation method and application of cobalt-tantalum-zirconium alloy target | |
| CN106077642B (en) | A kind of method of alloy nano-powder prepares coating conductor high-tungsten alloy base band billet | |
| CN116904838A (en) | High-carbon steel wire rod and production method thereof | |
| CN111004943A (en) | Preparation method of high-performance nickel-vanadium-copper-phosphorus alloy baseband | |
| CN114411024B (en) | Slab ingot for anodic oxidation 5xxx series aluminum material and preparation method thereof | |
| CN114905010A (en) | Nickel-based alloy wire and preparation method thereof | |
| CN115870334A (en) | Copper strip processing method and copper strip | |
| CN111014298B (en) | Rolling method for directly forming high-sulfur stainless steel 416 semi-continuous rolling ingot | |
| CN111690838B (en) | Easily-wound transformer-used red copper strip and preparation method thereof | |
| CN114410977B (en) | Preparation method of large-size high-strength invar forging | |
| CN108393496A (en) | A kind of preparation method of high-silicon steel thin strip | |
| CN116197235B (en) | Mixed hot rolling method for C19400 and C19210 cast ingots | |
| CN110938757B (en) | Preparation method of ultrahigh-strength texture nickel-based alloy baseband | |
| CN116274357A (en) | Short-process low-carbon preparation method of aluminum alloy material for new energy power battery | |
| CN117161095A (en) | Processing method for reducing annealing dezincification and discoloration of imitation gold copper alloy strip |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20210430 |
|
| RJ01 | Rejection of invention patent application after publication |