CN100580104C - Cooling technique after lead-containing easy-cutting steel rolling - Google Patents
Cooling technique after lead-containing easy-cutting steel rolling Download PDFInfo
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- CN100580104C CN100580104C CN200710132031A CN200710132031A CN100580104C CN 100580104 C CN100580104 C CN 100580104C CN 200710132031 A CN200710132031 A CN 200710132031A CN 200710132031 A CN200710132031 A CN 200710132031A CN 100580104 C CN100580104 C CN 100580104C
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Abstract
The invention relates to a cooling process in the field of metallurgy, in particular to an after-rolling cooling process for lead treated steel. The process carries out cooling according to the following three stages: in the first stage, the cooling from the beginning of final rolling to the beginning of phase change from an austenite to a ferrite adopts three sections of intermittent water-cooling modes, namely cooling, even heating, cooling, even heating, cooling and even heating; the spinning temperature is controlled at the temperature of between 830 and 870 DEG C; in the second stage, the cooling is carried out on the whole phase change process from the beginning of the phase change from the austenite to the ferrite to the finishing of the phase change of the austenite; the temperature for the lead treated steel to enter a cover cap is controlled at the temperature of between 650 and 700 DEG C; the temperature for the lead treated steel to come out of the cover cap is less than or equal to 600 DEG C; and in the third stage, the cooling adopts a natural cooling mode to cool the lead treated steel to the room temperature. The cooling process can avoid the growth of crystal grains of the lead treated steel in order that iron scale on the surface of the lead treated steel is changed to be thin and powdery and is greatly easy to be removed by pickling.
Description
Technical field
The present invention relates to a kind of process for cooling of field of metallurgy, Lead Treated Steel rolls postcooling technology specifically.
Background technology
Fast development along with industries such as national machining and precision instruments, requirement to work material improves constantly, thereby guarantee the surface smoothness of product, the demand of processing industry has been satisfied in the exploitation of Lead Treated Steel well, and the postcooling technology of rolling of Lead Treated Steel has significant meaning to tissue and the mechanical property whether Lead Treated Steel can obtain excellence.The postcooling technology of rolling of Lead Treated Steel generally is divided into three phases, fs begins cooling between phase transformation to austenite to ferrite for beginning from finish to gauge, subordinate phase is for beginning to fade to mutually the cooling of the whole phase transition process that austenite phase transformation is over from austenite to ferrite, and the phase III is that austenite phase transformation is over to the cooling of room temperature.Wherein the fs cooling purpose is to do structural preparation for phase transformation, and austenitic whole phase transition process has been controlled in the subordinate phase cooling, and the phase III cooling is in order to reduce the wire temperature after phase transformation finishes, to make things convenient for check, finishing, bundling and warehouse-in.Existing Lead Treated Steel what roll that postcooling technology takes is the cooling of above three phases, its shortcoming is that high laying temperature, delaying type retarded cooling process can cause the Lead Treated Steel grain growth, because of secondary oxidation, scale on surface is thick.
Summary of the invention
The objective of the invention is to propose a kind of make Lead Treated Steel that Lead Treated Steel obtains excellent tissue and mechanical property roll postcooling technology.
Purpose of the present invention can be achieved through the following technical solutions:
Lead Treated Steel roll postcooling technology, cool off by following three phases:
Fs: begin to begin cooling between phase transformation to ferrite to austenite from finish to gauge;
Subordinate phase: austenite begins to fade to mutually the cooling of the whole phase transition process that austenite phase transformation is over to ferrite;
Phase III: austenite phase transformation is over to the cooling of room temperature;
The three intersegmental cold modes of cutting off the water supply are adopted in the fs cooling, that is: cooling-soaking-cooling-soaking-cooling-soaking, and the control laying temperature is 830 ℃～870 ℃;
The subordinate phase cooling is by the cooling of delayed quench type stelmo line, and the temperature that the control Lead Treated Steel is gone into cover cap is at 650 ℃～700 ℃, and Lead Treated Steel goes out the temperature of cover cap smaller or equal to 600 ℃;
The phase III cooling adopts the mode of naturally cooling that Lead Treated Steel is cooled to room temperature.
Purpose of the present invention can also further realize by following technical measures:
Aforesaid Lead Treated Steel roll postcooling technology, in the fs cooling, adjust cooling jet and cooling water inflow and control laying temperature.
Aforesaid Lead Treated Steel roll postcooling technology, in the subordinate phase cooling, 1～8 cover cap before the stelmo line is opened.
Aforesaid Lead Treated Steel roll postcooling technology, in the subordinate phase cooling, control Lead Treated Steel by the control roller table speed and go into the cover cap temperature and go out the cover cap temperature, 1 section roller table speed is 20rpm, 2～4 sections roller-way speedups 103～105%.
Advantage of the present invention is: the postcooling technology of rolling of Lead Treated Steel of the present invention guarantees laying temperature at 830～870 ℃ by the cooling power that strengthens the fs, goes into the cover cap temperature about 680 ℃, goes out the cover cap temperature below 600 ℃.Reduce laying temperature and go into the cover cap temperature and can avoid the Lead Treated Steel grain growth, make its scale on surface become thin powdery, pickling is very easily removed.Take the delaying type retarded cooling process to make Lead Treated Steel that ferritic transformation take place in a large number, guarantee that the Lead Treated Steel wire rod is main tissue with the ferrite.
Embodiment
Embodiment one
Present embodiment be a kind of Lead Treated Steel roll postcooling technology, cool off by following three phases:
Fs: begin to begin cooling between phase transformation to ferrite to austenite from finish to gauge, adopt three intersegmentally to cut off the water supply cold mode promptly: cooling-soaking-cooling-soaking-cooling-soaking, the water-cooled line is made up of three sections water-cooled casees, four sections equal heat channel sections, each cooling tank has 4 cooling jets, water coolant by the cooling jet ejection cools off wire rod, about 220 ℃ of cooling temperature drop ability.Cooling jet quantity can be adjusted in the process of cooling and cooling water inflow comes controlled chilling intensity,, adjustment can be finished by operational computations machine system switching cooling jet and cooling water inflow.By operational computations machine system switching cooling jet and cooling water inflow, the control laying temperature is 830 ℃.
Subordinate phase: austenite begins to fade to mutually the cooling of the whole phase transition process that austenite phase transformation is over to ferrite.Delayed quench type stelmor line traffic control is cold to be on standard type refrigerative basis, is improved forming in conjunction with slow type refrigerative process characteristic.Install heat insulation thermal insulation layer side wall in the conveyor both sides additional, and on the thermal insulation layer wall of both sides the insulation shroud that can open and close flexibly is housed, insulation shroud has 56, by closing insulation shroud, reduces roller table speed and reaches the delaying type cooling.The subordinate phase cooling obtains good tissue and mechanical property by the cooling of delayed quench type stelmo line, and the cover cap of 1-8 before the stelmo line is opened, and control is gone into the temperature of cover cap at 650 ℃, and the temperature that goes out cover cap is controlled at below 600 ℃.Control Lead Treated Steel by the control roller table speed and go into the cover cap temperature and go out the cover cap temperature, 1 section roller table speed is 20rpm, 2～4 sections roller-way speedups 103%, the purpose of roller-way speedup: make and have a common boundary a shift in position, reduce the temperature of having a common boundary a little; Owing on the air-cooled alignment of high line factory the little elevation angle is arranged, guarantees that by the roller-way speedup steel transports smoothly at air-cooled line.
Phase III: austenite phase transformation is over to the cooling of room temperature, adopts naturally cooling, simultaneously according to weather condition, the airtight situation of output zone is controlled, and avoids reaching the unusual of contact portions product tissue.
Embodiment two
Present embodiment be a kind of Lead Treated Steel roll postcooling technology, cool off by following three phases:
Fs: begin to begin cooling between phase transformation to ferrite to austenite from finish to gauge, adopt three intersegmentally to cut off the water supply cold mode promptly: cooling-soaking-cooling-soaking-cooling-soaking, the water-cooled line is made up of three sections water-cooled casees, four sections equal heat channel sections, each cooling tank has 4 cooling jets, water coolant by the cooling jet ejection cools off wire rod, about 220 ℃ of cooling temperature drop ability.Cooling jet quantity can be adjusted in the process of cooling and cooling water inflow comes controlled chilling intensity,, adjustment can be finished by operational computations machine system switching cooling jet and cooling water inflow.By operational computations machine system switching cooling jet and cooling water inflow, the control laying temperature is 850 ℃.
Subordinate phase: austenite begins to fade to mutually the cooling of the whole phase transition process that austenite phase transformation is over to ferrite.Delayed quench type stelmor line traffic control is cold to be on standard type refrigerative basis, is improved forming in conjunction with slow type refrigerative process characteristic.Install heat insulation thermal insulation layer side wall in the conveyor both sides additional, and on the thermal insulation layer wall of both sides the insulation shroud that can open and close flexibly is housed, insulation shroud has 56, by closing insulation shroud, reduces roller table speed and reaches the delaying type cooling.The subordinate phase cooling obtains good tissue and mechanical property by the cooling of delayed quench type stelmo line, and 1～8 cover cap before the stelmo line is opened, and control is gone into the temperature of cover cap at 680 ℃, and the temperature that goes out cover cap is controlled at below 600 ℃.Control Lead Treated Steel by the control roller table speed and go into the cover cap temperature and go out the cover cap temperature, 1 section roller table speed is 20rpm, 2～4 sections roller-way speedups 104%, the purpose of roller-way speedup: make and have a common boundary a shift in position, reduce the temperature of having a common boundary a little; Owing on the air-cooled alignment of high line factory the little elevation angle is arranged, guarantees that by the roller-way speedup steel transports smoothly at air-cooled line.
Phase III: austenite phase transformation is over to the cooling of room temperature, adopts naturally cooling, simultaneously according to weather condition, the airtight situation of output zone is controlled, and avoids reaching the unusual of contact portions product tissue.
Embodiment three
Present embodiment be a kind of Lead Treated Steel roll postcooling technology, cool off by following three phases:
Fs: begin to begin cooling between phase transformation to ferrite to austenite from finish to gauge, adopt three intersegmentally to cut off the water supply cold mode promptly: cooling-soaking-cooling-soaking-cooling-soaking, the water-cooled line is made up of three sections water-cooled casees, four sections equal heat channel sections, each cooling tank has 4 cooling jets, water coolant by the cooling jet ejection cools off wire rod, about 220 ℃ of cooling temperature drop ability.Cooling jet quantity can be adjusted in the process of cooling and cooling water inflow comes controlled chilling intensity,, adjustment can be finished by operational computations machine system switching cooling jet and cooling water inflow.By operational computations machine system switching cooling jet and cooling water inflow, the control laying temperature is 870 ℃.
Subordinate phase: austenite begins to fade to mutually the cooling of the whole phase transition process that austenite phase transformation is over to ferrite.Delayed quench type stelmor line traffic control is cold to be on standard type refrigerative basis, is improved forming in conjunction with slow type refrigerative process characteristic.Install heat insulation thermal insulation layer side wall in the conveyor both sides additional, and on the thermal insulation layer wall of both sides the insulation shroud that can open and close flexibly is housed, insulation shroud has 56, by closing insulation shroud, reduces roller table speed and reaches the delaying type cooling.The subordinate phase cooling obtains good tissue and mechanical property by the cooling of delayed quench type stelmo line, and 1～8 cover cap before the stelmo line is opened, and control is gone into the temperature of cover cap at 700 ℃, and the temperature that goes out cover cap is controlled at below 600 ℃.Control Lead Treated Steel by the control roller table speed and go into the cover cap temperature and go out the cover cap temperature, 1 section roller table speed is 20rpm, 2～4 sections roller-way speedups 105%, the purpose of roller-way speedup: make and have a common boundary a shift in position, reduce the temperature of having a common boundary a little; Owing on the air-cooled alignment of high line factory the little elevation angle is arranged, guarantees that by the roller-way speedup steel transports smoothly at air-cooled line.
Phase III: austenite phase transformation is over to the cooling of room temperature, adopts naturally cooling, simultaneously according to weather condition, the airtight situation of output zone is controlled, and avoids reaching the unusual of contact portions product tissue.
The present invention can also have other embodiment, and the technical scheme that equal replacement of all employings or equivalent transformation form all drops within the scope of protection of present invention.
Claims (3)
- Lead Treated Steel roll postcooling technology, cool off by following three phases:Fs: begin to begin cooling between phase transformation to ferrite to austenite from finish to gauge;Subordinate phase: austenite begins to fade to mutually the cooling of the whole phase transition process that austenite phase transformation is over to ferrite;Phase III: austenite phase transformation is over to the cooling of room temperature;It is characterized in that: the three intersegmental cold modes of cutting off the water supply are adopted in described fs cooling, that is: cooling-soaking-cooling-soaking-cooling-soaking, and the control laying temperature is 830 ℃～870 ℃;The subordinate phase cooling is by the cooling of delayed quench type stelmo line, and the temperature that the control Lead Treated Steel is gone into cover cap is at 650 ℃～700 ℃, and Lead Treated Steel goes out the temperature of cover cap smaller or equal to 600 ℃;The phase III cooling adopts the mode of naturally cooling that Lead Treated Steel is cooled to room temperature.
- Lead Treated Steel as claimed in claim 1 roll postcooling technology, it is characterized in that: in the fs cooling, adjust cooling jet and cooling water inflow and control laying temperature.
- Lead Treated Steel as claimed in claim 1 roll postcooling technology, it is characterized in that: in the subordinate phase cooling, the cover cap of 1-8 before the stelmo line is opened.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200710132031A CN100580104C (en) | 2007-09-10 | 2007-09-10 | Cooling technique after lead-containing easy-cutting steel rolling |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200710132031A CN100580104C (en) | 2007-09-10 | 2007-09-10 | Cooling technique after lead-containing easy-cutting steel rolling |
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| Publication Number | Publication Date |
|---|---|
| CN101386906A CN101386906A (en) | 2009-03-18 |
| CN100580104C true CN100580104C (en) | 2010-01-13 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN200710132031A Expired - Fee Related CN100580104C (en) | 2007-09-10 | 2007-09-10 | Cooling technique after lead-containing easy-cutting steel rolling |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102319736A (en) * | 2011-09-21 | 2012-01-18 | 首钢总公司 | A kind of milling method of stanniferous easy-to-cut structural steel |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102896159B (en) * | 2011-07-29 | 2015-09-23 | 宝钢集团新疆八一钢铁有限公司 | Reduce the rolling process for cooling of wire drawing low-carbon steel rod bundle iron scale |
| CN105583235B (en) * | 2015-12-28 | 2017-06-23 | 钢铁研究总院 | The method of the piece-wise step type cooling control scale structure of hot-rolled reinforced bar |
| CN112588844A (en) * | 2020-10-28 | 2021-04-02 | 邯郸钢铁集团有限责任公司 | Method for controlling iron scale of high-temperature hot coil of automobile O5 plate at large cooling rate |
-
2007
- 2007-09-10 CN CN200710132031A patent/CN100580104C/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102319736A (en) * | 2011-09-21 | 2012-01-18 | 首钢总公司 | A kind of milling method of stanniferous easy-to-cut structural steel |
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| CN101386906A (en) | 2009-03-18 |
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Owner name: NANJING NANGANG INDUSTRY DEVELOPMENT CO., LTD. Free format text: FORMER OWNER: NANJING UNITE STEEL CO., LTD. Effective date: 20091218 |
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Effective date of registration: 20091218 Address after: Liuhe District of Nanjing City, Jiangsu Province, xiejiadian Patentee after: Nanjing Iron & Steel United Co., Ltd. Address before: Liuhe District of Nanjing City, Jiangsu Province, xiejiadian Patentee before: Nanjing Iron & Steel United Co., Ltd. |
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