CN101386031A - Rolling technique of lead treated steel - Google Patents
Rolling technique of lead treated steel Download PDFInfo
- Publication number
- CN101386031A CN101386031A CNA2007101320331A CN200710132033A CN101386031A CN 101386031 A CN101386031 A CN 101386031A CN A2007101320331 A CNA2007101320331 A CN A2007101320331A CN 200710132033 A CN200710132033 A CN 200710132033A CN 101386031 A CN101386031 A CN 101386031A
- Authority
- CN
- China
- Prior art keywords
- rolling
- temperature
- rolled piece
- material type
- treated steel
- 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.)
- Granted
Links
Landscapes
- Metal Rolling (AREA)
Abstract
The invention belongs to the field of metallurgy and relates to rolling process of lead-containing free-machining steel. A rolling mill is used for rolling, in the rough rolling process, the rolling temperature is controlled at 1030-1060 DEG C, the former three-pass material form is reduced 1-3mm based on the standard material form; in the intermediate rolling process, the roll material form is the standard material form, and the rolling temperature is controlled at 980-1030 DEG C; in the pre-finish rolling process, the roll material form is the standard material form, the rolling temperature is controlled at 1060-1030 DEG C, and the temperature of the rolled piece reaches 1005-1040 DEG C after the pre-finish rolling process; in the finish rolling process, the temperature of the rolled piece in a finishing mill is less than 980 DEG C, the roll material form is the standard material form, and the rolling temperature is controlled at 1020-1050 DEG C. The rolling process can prevent steel heaping caused by the cleavage crack of the cold, hot and frailty susceptible head of the rolled piece, prevent sliding accident caused by the high temperature of the steel, steadily increase the yield of the lead-containing free-machining steel, obviously reduce the waste, and greatly reduce the 100t steel fault time.
Description
Technical field
The present invention relates to a kind of rolling mill practice of field of metallurgy, specifically the rolling mill practice of lead treated steel.
Background technology
Fast development along with industries such as national machined and precision instruments, requirement to rapidoprint 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, for smooth rolling lead treated steel wire rod, can the rolling mill practice of steel billet normally carry out significant to production.Lead treated steel is to belong to the compound automatic steel of S, Pb, contain S, Pb in the steel than higher, high-temp plastic is relatively poor, even aborning heating process is carried out strictness control, if be not rolled the strictness control of technology, in the operation of rolling, rolled piece is easy to cause heap steel accident or the too high generation that causes sipping fault of steel temperature because of its cold and hot crisp sensitiveness head splitting.Controlled rolling is an advanced person's a steel rolling technology, and controlled rolling is heated to steel billet optimum temperature exactly, controls deflection and deformation temperature and roll steel are cooled off in the back according to technological requirement technical process when rolling.The rolling mill practice of existing lead treated steel because there are temperature difference in steel billet heart portion and surface, thereby produce stress, can cause head to be bloomed in the operation of rolling, causes heap steel accident.Roughing zone milling train material type accepted standard material type can not adapt to the production of lead treated steel, has improved head and has bloomed and cause the probability of heap steel accident, and the indexs such as lumber recovery, economic benefit of lead treated steel are descended.
Summary of the invention
The objective of the invention is to propose a kind of rolled piece that both can prevent and skid and the head splitting, can make rolled piece obtain good tissue and mechanical performance again, and guarantee the rolling mill practice of the lead treated steel that rolling line carries out smoothly.
Purpose of the present invention can be achieved through the following technical solutions:
The rolling mill practice of lead treated steel, utilize milling train to be rolled, comprise the roughing operation, in roll operation, pre-finish rolling operation, finish rolling operation, in the roughing operation, the controlled rolling temperature is 1030～1060 ℃, and first three sortie material type of milling train dwindles 1～3 millimeter on the basis of standard material type; In roll in the operation, milling train material type adopts the standard material type, the controlled rolling temperature is 980～1030 ℃; In the pre-finish rolling operation, milling train material type adopts the standard material type, and the controlled rolling temperature is 1060～1030 ℃, and the rolled piece temperature arrives 1005～1040 ℃ after the pre-finish rolling operation; In the finish rolling operation, the control rolled piece is gone into the finishing mill temperature less than 980 ℃, and milling train material type adopts the standard material type, and the controlled rolling temperature is 1020～1050 ℃.
Purpose of the present invention can also further realize by following technical measures:
Adopt water under high pressure that rolled piece is carried out de-scaling before the rolling mill practice of aforesaid lead treated steel, wherein said roughing operation, pressure is 70～130Mpa.
The rolling mill practice of aforesaid lead treated steel, in the wherein said roughing operation, the roughing operation is carried out de-scaling with adopting water under high pressure mid-term to rolled piece early stage, and pressure is 70～130Mpa.
The rolling mill practice of aforesaid lead treated steel, by reduce mill speed guarantee rolled piece in roughing zone rolling temperature in 1030～1060 ℃ of scopes.
The rolling mill practice of aforesaid lead treated steel, after the wherein said roughing operation, in roll operation before, utilize water-cooling groove that rolled piece is cooled off, make the rolled piece temperature arrive 950～1030 ℃.
The rolling mill practice of aforesaid lead treated steel, after the wherein said pre-finish rolling operation, before the finish rolling operation, using just, cold turbulent flow water tank makes the rolled piece temperature arrive 955～980 ℃.
The rolling mill practice of aforesaid lead treated steel after the wherein said pre-finish rolling operation, before the finish rolling operation, uses the empty pipe of crossing of water-cooled to make the rolled piece temperature arrive 955～980 ℃ with the water-cooled guide and guard.
Advantage of the present invention is: because the rolling temperature to each operation is controlled in the operation of rolling, prevented rolled piece because of the splitting of cold and hot crisp sensitiveness head causes heap steel accident, also prevented the too high and sipping fault of generation of invar temperature.Behind the rolling mill practice that has used lead treated steel of the present invention, the lumber recovery of lead treated steel steadily improves, in useless rate obviously descend, hundred tons of steel reduce fault time significantly.The inventor uses the rolling mill practice of lead treated steel of the present invention respectively 8 batches of lead treated steels to be rolled, and to its lumber recovery, in useless rate, hundred tons of steel add up fault time, draw the following table data:
Table 1
| Lot number | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 |
| Lumber recovery % | 91.42 | 92.98 | 85.74 | 91.85 | 92.1 | 95.72 | 93.47 | 93.25 |
| In useless rate % | 5.44 | 4.42 | 4.63 | 1.21 | 1.32 | 0 | 1.66 | 1.08 |
| Hundred tons of steel fault time (min) | 15.8 | 64.2 | 54.4 | 27.2 | 19.8 | 5.3 | 7.3 | 3.3 |
Can be learnt by last table: after adopting the rolling mill practice of lead treated steel of the present invention, the lumber recovery of lead treated steel is greatly improved, in useless rate obviously descend, hundred tons of steel reduce fault time significantly.
The specific embodiment
Embodiment one
Present embodiment is to Φ 6.5mm, long 10～12m, billet size is that the square billet of 150mm*150mm is rolled, and uses milling train to be rolled, milling train be divided into the roughing zone, in roll zone, pre-finish rolling zone, finishing mill zone.The roughing zone is totally 8 sorties, for cross-arranging type underloading milling train, is numbered 0#～7#; In roll zone totally 4 sorties, for cross-arranging type underloading milling train, be numbered 8#～11#; Pre-finish rolling zone and finishing mill zone are horizontally and vertically alternative formula milling train, totally 14 sorties, and the finish rolling zone number is 12#～15# in advance.Lead treated steel is through entering rolling mill practice behind the heating process, and lead treated steel goes out to heat furnace temperature at 1140--1190 ℃, rolling mill practice comprise the roughing operation, in roll operation, pre-finish rolling operation, finish rolling operation.
Before the roughing operation, adopt water under high pressure that rolled piece is carried out de-scaling, pressure is 100Mpa, the iron scale of billet surface is all broken, if the billet surface iron scale is not eliminated totally, then use standby rubber water pipe that billet surface is carried out high-pressure water descaling at 0# milling train place, arrange standby rubber water pipe to carry out the cleaning of iron scale behind the 4# milling train, it is clean that the billet surface iron scale is removed.
The roughing operation is carried out in milling train roughing zone, i.e. 0#～7# milling train, and 0#～7# milling train standard material type such as following table:
Table 2
| The milling train sortie | 0# | 1# | 2# | 3# | 4# | 5# | 6# | 7# |
| Material type (mm) | 105±2 | 112±2 | 75±2 | 92±1 | 55±1 | 65±1 | 37.5±1 | 50±1 |
Because the pass of preceding 3 sorties (0#～2# milling train) is a box, suitably increase deflection and can not produce cracking, be the pass schedule of circle-ellipse-circle successively from 3# milling train～7# design of section of rolling mill.First three sortie (0#～2#) receive the small powder type, 0# dwindles 3mm, and 1# dwindles 2mm, 2# dwindles 2mm, because front sortie material type diminishes, (the material type of 3#～7#) remains unchanged or receives the small powder type slightly all the other sorties of roughing, is actually 3#～7# milling train drafts and amplifies relatively.Adopt the probability of lead treated steel workpiece front end cracking behind this material type to obtain reduction.The material type is adjusted as following table:
Table 3
| The milling train sortie | 0# | 1# | 2# | 3# | 4# | 5# | 6# | 7# |
| Material type (mm) | 102±1 | 110±1 | 73±1 | 90±0.5 | 55±0.5 | 65±0.5 | 37.5±0.5 | 50±0.5 |
By suitable reduction mill speed guarantee rolled piece in roughing zone rolling temperature in 1030～1060 ℃ of scopes.Former mill speed is 92m/s, now mill speed is reduced 4m/s, and making mill speed is 88m/s.In addition, come the controlled rolling temperature, gas flow and hot air flowrate such as following table by control milling train roughing zone hot air flowrate and gas flow:
Table 4
| Hot air flowrate (m 3/h) | Gas flow (m 3/h) | |
| Last bringing-up section | 8000～9000 | 1000～1500 |
| Following bringing-up section | 10000～11000 | 900～1300 |
Rolled piece rolls the zone in entering before, shear through CV50 that workpiece front end is laggard goes into water-cooling groove (tank that is undertaken by two relative water flowings of external water pipe) the rolled piece temperature is descended 30 ℃, reach about 980～1015 ℃.In roll operation and in milling train, roll the zone and carry out, i.e. 8#～11# milling train, in roll operation milling train material type and adopt the standard material type, the controlled rolling temperature is 980～1030 ℃, by the water-cooling groove before the 8# rolling temperature is reduced.In addition, mill speed is reduced 3m/s on the original basis, making rolling temperature is within 980～1030 ℃.
Pre-finish rolling operation is carried out in the pre-finish rolling of milling train zone, and sortie is 12#～15#, and milling train material type adopts the standard material type, and the controlled rolling temperature is 1060～1030 ℃.By pre-finish rolling zone water-cooled guide and guard controlled rolling temperature, and mill speed reduced 4m/s on the original basis, making rolling temperature is 1060～1030 ℃.By in roll and pre-finish rolling zone after the temperature of rolled piece reach 1005～1040 ℃.Rolled piece enters the finish rolling operation after the CV20 shearing, rolled piece is gone into the temperature of finish rolling operation still relatively up to 1000～1030 ℃, for avoiding rolled piece in finishing mill, to skid, suppressing lead treated steel crystal grain simultaneously at high temperature grows up, make rolled piece pass through the cooling of cold turbulent flow water tank just, temperature is descended about 150 ℃ reach 955～980 ℃, assurance lead treated steel wire rod is gone into the finishing mill temperature less than 980 ℃.
The finish rolling operation is carried out in milling train finish rolling zone, and sortie is that 16#～25# milling train material type adopts the standard material type, and the controlled rolling temperature is 1020～1050 ℃.Cross pipe and water-cooled guide and guard controlled rolling temperature by the water-cooled in finish rolling zone is empty, and mill speed is reduced 2m/s on the original basis, making rolling temperature is 1020～1050 ℃.
Embodiment two
Present embodiment is to Φ 8mm, long 10～12m, billet size is that the square billet of 150mm*150mm is rolled, and uses milling train to be rolled, rolling mill practice comprise the roughing operation, in roll operation, pre-finish rolling operation, finish rolling operation.
Before the roughing operation, adopt water under high pressure that rolled piece is carried out de-scaling, pressure is 120Mpa, the iron scale of billet surface is all broken, if the billet surface iron scale is not eliminated totally, then use standby rubber water pipe that billet surface is carried out high-pressure water descaling at 0# milling train place, arrange standby rubber water pipe to carry out the cleaning of iron scale behind the 4# milling train, it is clean that the billet surface iron scale is removed.
The roughing operation is carried out in milling train roughing zone, i.e. 0#～7# milling train, and 0#～7# milling train standard material type such as following table:
Table 5
| The milling train sortie | 0# | 1# | 2# | 3# | 4# | 5# | 6# | 7# |
| Material type (mm) | 105±2 | 112±2 | 75±2 | 92±1 | 55±1 | 65±1 | 37.5±1 | 50±1 |
Because the pass of preceding 3 sorties (0#～2# milling train) is a box, suitably increase deflection and can not produce cracking, be the pass schedule of circle-ellipse-circle successively from 3# milling train～7# design of section of rolling mill.(0#～2#) receives the small powder type to first three sortie, and 0# dwindles 2mm, and 1# dwindles 3mm, and 2# dwindles 3mm, because front sortie material type diminishes, (the material type of 3#～7#) remains unchanged or receives the small powder type slightly all the other sorties of roughing.The material type is adjusted as following table:
Table 6
| The milling train sortie | 0# | 1# | 2# | 3# | 4# | 5# | 6# | 7# |
| Material type (mm) | 103±1 | 109±1 | 72±1 | 90±0.5 | 55±0.5 | 65±0.5 | 37.5±0.5 | 50±0.5 |
By suitable reduction mill speed guarantee rolled piece in roughing zone rolling temperature in 1030～1060 ℃ of scopes.Former mill speed is 92m/s, now mill speed is reduced 3m/s, and making mill speed is 89m/s.In addition, come the controlled rolling temperature, gas flow and hot air flowrate such as following table by control milling train roughing zone hot air flowrate and gas flow:
Table 7
| Hot air flowrate (m 3/h) | Gas flow (m 3/h) | |
| Last bringing-up section | 9000～10000 | 1500～1600 |
| Following bringing-up section | 9000～10000 | 800～900 |
Rolled piece rolls the zone in entering before, shear through CV50 that workpiece front end is laggard goes into water-cooling groove the rolled piece temperature is descended 30 ℃, reach about 980～1015 ℃.In roll operation and in milling train, roll the zone and carry out, i.e. 8#～11# milling train, in roll operation milling train material type and adopt the standard material type, the controlled rolling temperature is 980～1030 ℃, by the water-cooling groove before the 8# rolling temperature is reduced.In addition, mill speed is reduced 5m/s on the original basis, making rolling temperature is within 980～1030 ℃.
Pre-finish rolling operation is carried out in the pre-finish rolling of milling train zone, and sortie is 12#～15#, and milling train material type adopts the standard material type, and the controlled rolling temperature is 1060～1030 ℃.By pre-finish rolling zone water-cooled guide and guard controlled rolling temperature, and mill speed reduced 5m/s on the original basis, making rolling temperature is 1060～1030 ℃.By in roll and pre-finish rolling zone after the temperature of rolled piece reach 1005～1040 ℃.Rolled piece enters the finish rolling operation after the CV20 shearing, rolled piece is gone into the temperature of finish rolling operation still relatively up to 1000～1030 ℃, for avoiding rolled piece in finishing mill, to skid, suppressing lead treated steel crystal grain simultaneously at high temperature grows up, make rolled piece pass through the cooling of cold turbulent flow water tank just, temperature is descended about 150 ℃ reach 955～980 ℃, assurance lead treated steel wire rod is gone into the finishing mill temperature less than 980 ℃.
The finish rolling operation is carried out in milling train finish rolling zone, and sortie is that 16#～25# milling train material type adopts the standard material type, and the controlled rolling temperature is 1020～1050 ℃.Cross pipe and water-cooled guide and guard controlled rolling temperature by the water-cooled in finish rolling zone is empty, and mill speed is reduced 3m/s on the original basis, making rolling temperature is 1020～1050 ℃.
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 (7)
1. the rolling mill practice of lead treated steel utilizes milling train to be rolled, comprise the roughing operation, in roll operation, pre-finish rolling operation, finish rolling operation, it is characterized in that:
In the described roughing operation, the controlled rolling temperature is 1030～1060 ℃, and first three sortie material type of milling train dwindles 1～3 millimeter on the basis of standard material type;
Roll in described in the operation, milling train material type adopts the standard material type, and the controlled rolling temperature is 980～1030 ℃;
In the described pre-finish rolling operation, milling train material type adopts the standard material type, and the controlled rolling temperature is 1060～1030 ℃, and the rolled piece temperature arrives 1005～1040 ℃ after the pre-finish rolling operation;
In the described finish rolling operation, the control rolled piece is gone into the finishing mill temperature less than 980 ℃, and milling train material type adopts the standard material type, and the controlled rolling temperature is 1020～1050 ℃.
2. the rolling mill practice of lead treated steel as claimed in claim 1 is characterized in that: adopt water under high pressure that rolled piece is carried out de-scaling before the described roughing operation, pressure is 70～130Mpa.
3. the rolling mill practice of lead treated steel as claimed in claim 1 or 2 is characterized in that: in the described roughing operation, the roughing operation is carried out de-scaling with adopting water under high pressure mid-term to rolled piece early stage, and pressure is 70～130Mpa.
4. the rolling mill practice of lead treated steel as claimed in claim 1 is characterized in that: by reduce mill speed guarantee rolled piece in roughing zone rolling temperature in 1030～1060 ℃ of scopes.
5. the rolling mill practice of lead treated steel as claimed in claim 1 is characterized in that: after the described roughing operation, in roll operation before, utilize water-cooling groove that rolled piece is cooled off, make the rolled piece temperature arrive 950～1030 ℃.
6. the rolling mill practice of lead treated steel as claimed in claim 1 is characterized in that: after the described pre-finish rolling operation, before the finish rolling operation, use first cold turbulent flow water tank to make the rolled piece temperature arrive 955～980 ℃.
7. the rolling mill practice of lead treated steel as claimed in claim 6 is characterized in that: after the described pre-finish rolling operation, before the finish rolling operation, use the empty pipe of crossing of water-cooled to make the rolled piece temperature arrive 955～980 ℃ with the water-cooled guide and guard.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007101320331A CN101386031B (en) | 2007-09-10 | 2007-09-10 | Rolling technique of lead treated steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007101320331A CN101386031B (en) | 2007-09-10 | 2007-09-10 | Rolling technique of lead treated steel |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101386031A true CN101386031A (en) | 2009-03-18 |
| CN101386031B CN101386031B (en) | 2010-07-21 |
Family
ID=40475816
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2007101320331A Expired - Fee Related CN101386031B (en) | 2007-09-10 | 2007-09-10 | Rolling technique of lead treated steel |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101386031B (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105234170A (en) * | 2015-11-02 | 2016-01-13 | 江苏省沙钢钢铁研究院有限公司 | Large-specification free-cutting steel rolling method |
| CN110681696A (en) * | 2019-09-19 | 2020-01-14 | 宝钢特钢韶关有限公司 | Rolling process of high-sulfur steel |
| CN111014298A (en) * | 2019-12-02 | 2020-04-17 | 抚顺特殊钢股份有限公司 | Direct ingot rolling method for high-sulfur stainless steel 416 semi-continuous rolling |
| CN112404126A (en) * | 2020-10-29 | 2021-02-26 | 中天钢铁集团有限公司 | Controlled rolling and cooling method for improving sulfide form of free-cutting steel wire rod |
| CN114653757A (en) * | 2022-04-06 | 2022-06-24 | 中天钢铁集团(南通)有限公司 | Control method for high-speed wire free-cutting steel material shape |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102389894B (en) * | 2011-10-28 | 2013-12-18 | 首钢贵阳特殊钢有限责任公司 | Rolling process of bismuth-containing free cutting steel |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1219903C (en) * | 2003-04-22 | 2005-09-21 | 首钢总公司 | Free machining structural steel of containing stannum |
| CN1289219C (en) * | 2004-11-22 | 2006-12-13 | 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 |
-
2007
- 2007-09-10 CN CN2007101320331A patent/CN101386031B/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105234170A (en) * | 2015-11-02 | 2016-01-13 | 江苏省沙钢钢铁研究院有限公司 | Large-specification free-cutting steel rolling method |
| CN110681696A (en) * | 2019-09-19 | 2020-01-14 | 宝钢特钢韶关有限公司 | Rolling process of high-sulfur steel |
| CN111014298A (en) * | 2019-12-02 | 2020-04-17 | 抚顺特殊钢股份有限公司 | Direct ingot rolling method for high-sulfur stainless steel 416 semi-continuous rolling |
| CN111014298B (en) * | 2019-12-02 | 2022-06-10 | 抚顺特殊钢股份有限公司 | Rolling method for directly forming high-sulfur stainless steel 416 semi-continuous rolling ingot |
| CN112404126A (en) * | 2020-10-29 | 2021-02-26 | 中天钢铁集团有限公司 | Controlled rolling and cooling method for improving sulfide form of free-cutting steel wire rod |
| CN112404126B (en) * | 2020-10-29 | 2022-04-08 | 中天钢铁集团有限公司 | Controlled rolling and cooling method for improving sulfide form of free-cutting steel wire rod |
| CN114653757A (en) * | 2022-04-06 | 2022-06-24 | 中天钢铁集团(南通)有限公司 | Control method for high-speed wire free-cutting steel material shape |
| CN114653757B (en) * | 2022-04-06 | 2023-08-18 | 中天钢铁集团(南通)有限公司 | High-speed wire free-cutting steel material type control method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101386031B (en) | 2010-07-21 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101386031B (en) | Rolling technique of lead treated steel | |
| CN103769424B (en) | The control method of steekle mill surface of steel plate red scale | |
| CN111676355B (en) | Online solution treatment process for austenitic stainless steel plate | |
| CN103710507B (en) | A kind of preparation method of low nickel duplex stainless steel hot-rolled sheet coil | |
| CN104878317A (en) | Hot-rolling production method for low-nickel austenitic stainless steel coils | |
| CN102319734B (en) | Method for effectively controlling small pockmark defects on surface of medium plate | |
| CN103173598B (en) | Annealing-free medium-high carbon steel plate making technology | |
| CN102266866B (en) | Technology for producing hot-rolled pipeline steel of roll mill with single frame furnace | |
| CN104525560A (en) | Effective control method for pitted surface of plain carbon steel/Nb-containing steel plate of 20-30 mm thickness | |
| CN105256246A (en) | Method for producing thin-specification and high-strength atmosphere corrosion resistance structural steel plate | |
| CN103409642A (en) | Processing method of low yield ratio high strength titanium coiled plate for heat exchanger | |
| CN111635986B (en) | Head and tail temperature control method for hectometer heat-treated steel rail | |
| CN102389894B (en) | Rolling process of bismuth-containing free cutting steel | |
| CN103302262B (en) | Continuous casting plate blank surface quenching technology and used device | |
| CN101862760B (en) | High-pressure low-flow descaling process of four-roller reversing steckel mill | |
| CN104588418B (en) | A kind of method eliminating ultra-low-carbon steel surface pit defect | |
| CN101108396A (en) | Control method of high speed wire bar hot rolling surface red rust | |
| CN104399748B (en) | A kind of production technology that can replace conventional broadband steel hot continuous rolling | |
| CN110369519B (en) | Plate type control method for 500 MPa-level low-alloy high-strength steel plate in rolling process | |
| CN103409686A (en) | Production method of Q345D steel plate | |
| CN113355496B (en) | On-line solution annealing process for rolling waste heat of stainless steel hot-rolled coil | |
| CN109226260A (en) | A method of avoiding ultra-low-carbon steel edge veining defect | |
| CN104998917A (en) | Method for removing streak defects on hot rolled steel plate surface | |
| CN103862248A (en) | Method for effectively preventing generation of head and tail surface defects in hot rolling process | |
| CN105234170B (en) | A kind of big specification automatic steel milling method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| ASS | Succession or assignment of patent right |
Owner name: NANJING NANGANG INDUSTRY DEVELOPMENT CO., LTD. Free format text: FORMER OWNER: NANJING UNITE STEEL CO., LTD. Effective date: 20091120 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| TA01 | Transfer of patent application right |
Effective date of registration: 20091120 Address after: Liuhe District of Nanjing City, Jiangsu Province, xiejiadian post encoding: 210035 Applicant after: Nanjing Iron & Steel United Co., Ltd. Address before: Liuhe District of Nanjing City, Jiangsu Province, xiejiadian post encoding: 210035 Applicant before: Nanjing Iron & Steel United Co., Ltd. |
|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100721 Termination date: 20150910 |
|
| EXPY | Termination of patent right or utility model |