CN106001105A - Method for manufacturing free-cutting stainless steel bar through hot rolling - Google Patents
Method for manufacturing free-cutting stainless steel bar through hot rolling Download PDFInfo
- Publication number
- CN106001105A CN106001105A CN201610248776.4A CN201610248776A CN106001105A CN 106001105 A CN106001105 A CN 106001105A CN 201610248776 A CN201610248776 A CN 201610248776A CN 106001105 A CN106001105 A CN 106001105A
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- bar
- rolling
- stainless steel
- cutting stainless
- steel bar
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- 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
-
- 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
Abstract
The invention provides a method for manufacturing a free-cutting stainless steel bar through hot rolling. According to the method, cost is low, the rolling technical process is mature, and the product quality is stable and reliable. The method comprises the following steps of S1, bar preheating treatment, S2, heating treatment, S3, heat insulation treatment, S4, bar rolling, S5, rolling area cooling, S6, quick cooling of the finished bar, and S7, online winding. Compared with the prior art, according to the technical process of the scheme, the method has the beneficial effects that few assembly line work procedures are adopted, the product yield is high, automatic control can be achieved, safety and reliability are achieved, operation is easy, and the quality of the finished bar is good. Especially, the process method of stainless steel online heating and one-time rolling forming is achieved, and therefore the production and manufacturing cost of the bar is quite low, and the bar can completely replace a finished product manufactured through a traditional bar rolling process.
Description
Technical field
The present invention relates to free cutting stainless steel field of material technology, refer more particularly to a kind of free cutting stainless steel formula being applied on TV and manufacture method thereof.
Background technology
The manufacture method of existing stainless steel bars, it mainly has rolled bar preparation method and squeezing and pressing method.In both processing methods, the former uses both at home and abroad mostly, after large steel ingot is carried out split rolling method, then carries out roughing, intermediate rolling and finish rolling, its rolling equipment many selections duo mill and the combined configuration of two roller three-high mills.The weak point of this machining manufacture essentially consists in, operation is many, energy consumption is high, lumber recovery low (only about 65%), overlength rod product can not be manufactured, and off-line solution heat treatment need to be carried out after rolling again, bar processing and manufacturing cost is the most just greatly improved high so that it is lack the market competitiveness.The shortcoming of squeezing and pressing method is mainly little ingot weight, and geometry scrap piece loss is big, and metal flow is uneven, and extrusion speed is low, non-cutting time length and mould loss is big, high in cost of production defect.
At present, Direct Rolling Technology and burning optimization on line technique are gradually applied.In the excellent lineman factory of Zhu Jin rustless steel company of Nippon Steel, in roughing, introduce the inclination milling train that can carry out the big pressure of a time early than other company, go back development and application burning optimization on line technology simultaneously, apply Direct Rolling burning optimization on line technique.Within 2002, Nippon Steel Corp Guang Chang has carried out stainless steel bar line scrap build, the finishing mill after intermediate mill is transformed into from two traditional roll shapes the finishing rolling mill of three roll shapes, thus increases substantially the dimensional accuracy of wire fabrication.Additionally, substitute mode in groups is changed in the roll change operation of change size, and roll changing time is greatly shortened.2011, Da Nielimogenshama is Mittal company limited of India newly-built stainless steel bar wire rod rolling line, and this production line includes that heating furnace, a stand reversible roughing mill and supporting Input/Output Device, the Continuous mill train being made up of 14 Ping-vertical frame without memorial archway arranged, 10 frame light reduction Delta wire rod rolling unit, LLH Laying head, a wire rod dissipate and roll up controlled cooling pipeline and coil finishing equipment online accordingly.
In sum, the process of Present Domestic processing and manufacturing stainless steel bars all have that operation is many, energy consumption and the high deficiency of production cost.In view of this, just it is particularly important for how searching out the rolling technique means of a kind of with low cost, rolling technique technical maturity and stable and reliable product quality.
Summary of the invention
It is an object of the invention to overcome the deficiencies in the prior art, it is provided that the hot rolling of a kind of with low cost, rolling technique technical maturity and stable and reliable product quality manufactures the method for free cutting stainless steel bar.
For achieving the above object, technical scheme provided by the present invention is: a kind of hot rolling manufactures the method for free cutting stainless steel bar, it is characterised in that: comprise the following steps: S1, bar the pre-heat treatment；S2, heat treated；S3, isothermal holding；S4, rolling bar；S5, rolling zone cool down；S6, rod product quickly cool down；S7, online rolling.
Preferably, in step sl to bar the pre-heat treatment during, use heating by electric cooker, will by the gross bar be heated to 650 DEG C～700 DEG C.
Preferably, during in step s 2 the bar after preheated process being carried out heat treated, it is for be heated to 1150 DEG C～1250 DEG C by bar by online electric induction coil.
Preferably, during being incubated the bar after heated process online in step s3, it is that the temperature of bar is maintained at 1150 DEG C～1250 DEG C.
Preferably, during in step s 4 bar being carried out rolling bar, it carries out rolling operation with aximal deformation value two-forty.
Preferably, carrying out in rolling zone cooling procedure to rolled bar in step s 5, it is the cooling way being adapted to different bar deflection by the method taking cooling water amount and cooling water active position.
Preferably, in step s 6 in cooling processing procedure quick to rod product, for being cooled fast to ambient temperature with the rate of temperature fall of 80 DEG C/s～100 DEG C/s.
Preferably, during in the step s 7 rod product being carried out online rolling, under the conditions of ensureing that bar charging aperture is non-rotary, by leaving certain space for finished product hot and on the premise of not affecting material property, for it, certain torsion occurring, then on-line cooling realizes cold conditions rolling.
Preferably, described high-speed deformation speed is in 250rpm～300rpm scope by three-roller planetary rolling mill revolution deep bid rotating speed, and rolling speed regulates and controls in the range of 5m/min～8m/min, wherein the modification scope of aximal deformation value two-forty has been related to the height of rolling bar temperature.
Preferably, described bar is free cutting stainless steel bar.
Compared with prior art, this programme technical matters, the features such as it is few that it has assembly line work operation, and product lumber recovery is high, can automatically control, safe and reliable, it is easy to operation, rod product quality better.Especially present invention achieves the process of rustless steel on-line heating and disposable roll forming so that it is manufacturing cost is at a fairly low, the finished product that tradition rod material rolling process manufactures can be substituted completely.
Detailed description of the invention
Below in conjunction with specific embodiment, the invention will be further described:
A kind of hot rolling described in the present embodiment manufactures the method for free cutting stainless steel bar, and it comprises the steps: that (1) bar to be processed carries out mass entirety the pre-heat treatment, heating-up temperature about 650 DEG C～700 DEG C；Then；(2) bar on-line heat treated, heating-up temperature about 1150 DEG C～1250 DEG C, subsequently；(3) bar after heating is by thermal insulation casing device, it is ensured that free cutting stainless steel has suitable rolling temperature, sends into；(4) three-roller planetary rolling mill carries out aximal deformation value two-forty rolling to bar more than recrystallization temperature, now；(5) ring-like chiller carries out subregion temperature control to rolling bar region, subsequently；(6) mill product part quickly cools down, and proceeds at random；(7) the online rolling of mill product.
The present invention is according to various free cutting stainless steel bar alloying components and the difference of content, and its recrystallization temperature is the most variant, and above steps can mate corresponding technical measures according to the change of recrystallization temperature.But the present invention verifies through test of many times, thus show that the preferred technical measures of each step are: at bar preheating step, use heating by electric cooker, 650 DEG C～700 DEG C will be heated to by bar by the gross.This heating means firing rate is fast, and workpiece deformation is little, aoxidizes little, and stock utilization is up to 95%, and homogeneous heating, the core table temperature difference is minimum, and can heat in batches, meets low energy consumption, free of contamination demand.
In heat treatment step, use online electric induced line circle to heat, on the basis of preheating temperature, bar is heated to 1150 DEG C～1250 DEG C by electric induction coil, sensing is short for heat time heating time, speed is fast, and less energy consumption is pollution-free, noiseless, and bar and the non-contacting mode of heating of induction coil can be realized, so compared with other mode of heating, aoxidizing minimum.The most online electrical induction can realize automatically controlling, it is easy to operation.Simultaneously according to free cutting stainless steel bar alloying component and the difference of content, adjust heating-up temperature, it is achieved stainless steel bars hot rolling production line operates, and the present invention is not precluded from other on-line heating modes.
In isothermal holding step, high temperature bar is by the thermal insulation casing device put in three-roller planetary rolling mill main transmission box body, the effect of thermal insulation casing device, should guarantee that bar is in high temperature state to be rolled, ensure that the thermal energy of high temperature bar is not delivered in main transmission casing again, thus affect three-roller planetary rolling mill and normally roll.Wherein thermal insulation casing device coordinates with main transmission box body space, gap value 2mm～4mm, and thermal insulation casing device is by being incubated asbestos layer, constituting every cylinder, water flowing layer, cylinder, and water flowing layer is connected formation recirculated cooling water with steel rolling mill water pipe.And then heating bar imports three-roller planetary rolling mill from thermal insulation casing device.
In rolling bar step, nipped by three-roller planetary rolling mill by the bar of thermal insulation casing device, this process can make bar heating-up temperature decline, but aximal deformation value two-forty rolling can be deformed heat, the two superposition makes stainless steel bars again reach the temperature of dynamic recrystallization, forms with the rolling of aximal deformation value two-forty.Aximal deformation value two-forty is in 250rpm～300rpm scope by three-roller planetary rolling mill revolution deep bid rotating speed, and rolling speed regulates and controls in the range of 5m/min～8m/min, and wherein the modification scope of aximal deformation value two-forty has been related to the height of rolling bar temperature.Owing to bar temp is more than recrystallization temperature, its deformation occurred under certain superheat state, so may result in bar lengthening coefficient to increase, plasticity strengthens, everything is conducive to stainless steel bars to be fully finished dynamic recrystallization, the grain structure making stainless steel bars is more tiny, uniform, thus ensure that the feasibility of manufacture method of the present invention.
At rolling bar district cooling step, during bar quick large deformation rolling, bar by nip mouth to deformation rolling zone during, rolling zone each position point produces substantial amounts of deformation heat, in now flow of metal district, each point need to meet different temperature requirements according to stainless steel bars alloying component and the difference of content, only being in the temperature range of bar metal flow, hot-rolled stainless Steel Bar could realize stable rolling.The Main Means that wherein deformed area temperature adjusts is to use ring type cooling device, and this chiller can control cooling water inflow and cooling point position.
At the bar quick cooling step of rolled piece finished product, three-roller planetary rolling mill is shut out finished product and carries out quick samming cooling, be cooled to ambient temperature with the rate of temperature fall of 80 DEG C/s～100 DEG C/s.Actually a kind of heat treatment process of the quick cooling step of bar, this process can make the crystal grain of stainless steel bars refine further, for follow-up deep processing or be manufactured directly to product and provide excellent mechanical property.
Online rolling step, production line balance due to on-line heating to be realized, and actual production cannot ensure, bar inlet and product outlet realize not rotating, this hot rolling manufactures in the method for free cutting stainless steel bar, the non-rotary condition of bar charging aperture need to be ensured, so it is inevitable practical problem that product outlet rotates.In unit placement process, by leaving certain space distance in rod product rolling exit and online rolling holding position, for finished product hot and certain torsion occurs on the premise of not affecting material property, then on-line cooling realizes cold conditions rolling.
It should be noted that, the above-mentioned method manufacturing free cutting stainless steel bar for hot rolling, similar non-ferrous metal bar heat being prolonged manufacture field and also has technical enlightenment, this enlightenment can make quite a few hot rolled rod product in bar product manufacturing industry disposably be realized by above-mentioned processing method.Therefore, all coloured bar products relating to utilize the method to produce, it is regarded as falling into invention which is intended to be protected.
The examples of implementation of the above are only the preferred embodiments of the invention, not limit the practical range of the present invention with this, therefore the change that all shapes according to the present invention, principle are made, all should contain within the scope of the present invention.
Claims (9)
1. the method that a hot rolling manufactures free cutting stainless steel bar, it is characterised in that: include following step
Rapid: S1, bar the pre-heat treatment；S2, heat treated；S3, isothermal holding；S4, rolled bar
System；S5, rolling zone cool down；S6, rod product quickly cool down；S7, online rolling.
A kind of hot rolling the most according to claim 1 manufactures the method for free cutting stainless steel bar,
It is characterized in that: during in step sl to bar the pre-heat treatment, use heating by electric cooker,
650 DEG C～700 DEG C will be heated to by bar by the gross.
A kind of hot rolling the most according to claim 1 manufactures the method for free cutting stainless steel bar,
It is characterized in that: in step s 2 the bar after preheated process is carried out the mistake of heat treated
Cheng Zhong, it is for be heated to 1150 DEG C～1250 DEG C by bar by online electric induction coil；?
During the bar after heat treated being carried out isothermal holding in step S3, it will be for heating
After bar by on-line insulating device keep bar temperature.
A kind of hot rolling the most according to claim 1 manufactures the method for free cutting stainless steel bar,
It is characterized in that: carry out in the operation of rolling to bar in step s 4, it is high with aximal deformation value
Speed carries out rolling operation.
A kind of hot rolling the most according to claim 1 manufactures the method for free cutting stainless steel bar,
It is characterized in that: carry out in rolling zone cooling procedure to rolled bar in step s 5, it is logical
Cross and take the method for cooling water amount and cooling water active position to adapt to different bar deflection
Cooling way.
A kind of hot rolling the most according to claim 1 manufactures the method for free cutting stainless steel bar,
It is characterized in that: in step s 6 in cooling processing procedure quick to rod product, for 80 DEG C
The rate of temperature fall of/s～100 DEG C/s is cooled fast to ambient temperature.
A kind of hot rolling the most according to claim 1 manufactures the method for free cutting stainless steel bar,
It is characterized in that: during in the step s 7 rod product being carried out online rolling, for
Under the conditions of ensureing that bar charging aperture is non-rotary, by leave certain space for finished product hot and
On the premise of not affecting material property, for it, certain torsion occurring, then on-line cooling realizes
Cold conditions rolling.
A kind of hot rolling the most according to claim 4 manufactures the method for free cutting stainless steel bar,
It is characterized in that: described aximal deformation value two-forty is to turn round deep bid rotating speed by three-roller planetary rolling mill
In 250rpm～300rpm scope, and rolling speed regulates and controls in the range of 5m/min～8m/min
, wherein the modification scope of aximal deformation value two-forty has been related to the height of rolling bar temperature.
9. manufacture free cutting stainless steel bar according to the arbitrary described a kind of hot rolling of claim 1 to 8
Method, it is characterised in that: described bar is free cutting stainless steel bar.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610248776.4A CN106001105A (en) | 2016-04-20 | 2016-04-20 | Method for manufacturing free-cutting stainless steel bar through hot rolling |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610248776.4A CN106001105A (en) | 2016-04-20 | 2016-04-20 | Method for manufacturing free-cutting stainless steel bar through hot rolling |
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| CN106001105A true CN106001105A (en) | 2016-10-12 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201610248776.4A Pending CN106001105A (en) | 2016-04-20 | 2016-04-20 | Method for manufacturing free-cutting stainless steel bar through hot rolling |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109531053A (en) * | 2018-10-22 | 2019-03-29 | 安徽杰航不锈钢装饰工程有限公司 | A kind of production method of close tolerance bar |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04339502A (en) * | 1991-05-15 | 1992-11-26 | Toa Steel Co Ltd | Manufacture of medium and small bar steels |
| CN1480268A (en) * | 2003-08-06 | 2004-03-10 | 江苏兴荣高新科技股份有限公司 | Method for hot rolling tube of copper and copper alloy |
| CN1608758A (en) * | 2004-11-22 | 2005-04-27 | 宝钢集团上海五钢有限公司 | Hot continuous rolling process of high-sulfur (sulfur-phosphorus) free cutting structural steel |
| JP2007098436A (en) * | 2005-10-04 | 2007-04-19 | Sumitomo Metal Ind Ltd | Method for hot-rolling hard-to-work billet |
| CN101428291A (en) * | 2008-12-18 | 2009-05-13 | 洛阳高科钼钨材料有限公司 | Production process for large weight soldering-free molybdenum wire pole stock |
-
2016
- 2016-04-20 CN CN201610248776.4A patent/CN106001105A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04339502A (en) * | 1991-05-15 | 1992-11-26 | Toa Steel Co Ltd | Manufacture of medium and small bar steels |
| CN1480268A (en) * | 2003-08-06 | 2004-03-10 | 江苏兴荣高新科技股份有限公司 | Method for hot rolling tube of copper and copper alloy |
| CN1608758A (en) * | 2004-11-22 | 2005-04-27 | 宝钢集团上海五钢有限公司 | Hot continuous rolling process of high-sulfur (sulfur-phosphorus) free cutting structural steel |
| JP2007098436A (en) * | 2005-10-04 | 2007-04-19 | Sumitomo Metal Ind Ltd | Method for hot-rolling hard-to-work billet |
| CN101428291A (en) * | 2008-12-18 | 2009-05-13 | 洛阳高科钼钨材料有限公司 | Production process for large weight soldering-free molybdenum wire pole stock |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109531053A (en) * | 2018-10-22 | 2019-03-29 | 安徽杰航不锈钢装饰工程有限公司 | A kind of production method of close tolerance bar |
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| Date | Code | Title | Description |
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| C06 | Publication | ||
| PB01 | Publication | ||
| CB03 | Change of inventor or designer information |
Inventor after: Xie Junxian Inventor after: Meng Xuyi Inventor after: Liang Zhenrong Inventor after: Ye Xuming Inventor before: Xie Junxian Inventor before: Meng Xuyi Inventor before: Zhang Rongxin Inventor before: Liang Zhenrong Inventor before: Ye Xuming |
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| COR | Change of bibliographic data | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WD01 | Invention patent application deemed withdrawn after publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20161012 |