CN106480260A - Method for directly producing prestressed steel bar by adopting online heat treatment - Google Patents
Method for directly producing prestressed steel bar by adopting online heat treatment Download PDFInfo
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- CN106480260A CN106480260A CN201510524702.4A CN201510524702A CN106480260A CN 106480260 A CN106480260 A CN 106480260A CN 201510524702 A CN201510524702 A CN 201510524702A CN 106480260 A CN106480260 A CN 106480260A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 42
- 239000010959 steel Substances 0.000 title claims abstract description 42
- 238000010438 heat treatment Methods 0.000 title claims abstract description 15
- 238000000034 method Methods 0.000 title claims abstract description 11
- 238000010791 quenching Methods 0.000 claims abstract description 40
- 230000000171 quenching effect Effects 0.000 claims abstract description 40
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 30
- 238000005096 rolling process Methods 0.000 claims abstract description 12
- 238000009987 spinning Methods 0.000 claims abstract description 8
- 238000005496 tempering Methods 0.000 claims abstract description 8
- 229910000754 Wrought iron Inorganic materials 0.000 claims description 15
- 239000004744 fabric Substances 0.000 claims description 6
- 229910000734 martensite Inorganic materials 0.000 claims description 6
- 238000004806 packaging method and process Methods 0.000 claims description 6
- 238000005457 optimization Methods 0.000 claims description 5
- 230000003111 delayed effect Effects 0.000 abstract description 6
- 239000013078 crystal Substances 0.000 abstract description 4
- 230000006698 induction Effects 0.000 abstract description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 238000010622 cold drawing Methods 0.000 abstract 1
- 238000001816 cooling Methods 0.000 abstract 1
- 238000011084 recovery Methods 0.000 abstract 1
- 239000002436 steel type Substances 0.000 abstract 1
- 239000012535 impurity Substances 0.000 description 3
- 229910001566 austenite Inorganic materials 0.000 description 2
- 241001669679 Eleotris Species 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005098 hot rolling Methods 0.000 description 1
- 239000011513 prestressed concrete Substances 0.000 description 1
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- Heat Treatment Of Strip Materials And Filament Materials (AREA)
Abstract
The invention provides a method for directly producing prestressed steel bars by adopting online heat treatment, which comprises the steps of heating a steel billet to 900-950 ℃, and rolling spiral ribs on a horizontal and vertical alternating wire rod rolling mill; cooling by water after rolling, and spinning at 880-900 ℃; the wire loop is distributed on a roller conveyor for temperature recovery; then, continuously feeding the wire ring of one steel spinning into an EDC quenching tank for direct quenching, and selecting the water temperature in the quenching tank according to different steel types and diameters; injecting cold water into the quenching tank to enable the water in the quenching tank to form vortex; and after being rolled, the steel is placed on a hook of a PF chain, and the tempering temperature is 390-450 ℃ and the time is 10-30 min, so that the performance requirement of the pre-pressure steel bar is met. The invention can save the working procedures of mechanical descaling, cold drawing forming and induction heating, greatly reduce the energy and other consumption of the working procedures and reduce the production cost of the prestressed steel bar; and the rolled crystal grains are large, so that the yield ratio can be reduced, and the uniform elongation performance is improved, thereby solving the problems of delayed fracture and high yield ratio of the steel bar.
Description
Technical field
The invention belongs to steel rolling process technical field, more particularly to a kind of burning optimization on line method for being directly produced prestressed steel bar.
Background technology
High strength low relaxed rod iron for prestressed concrete is currently used primarily in steel-pipe pile etc., using low-alloy wire rod through mechanical descaling,
Cold drawn forming, induction hardening tempering process are produced.Product tensile strength 1420MPa, partly reaches 1570MPa.
Prestressed steel bar adopted induction hardening tempering process to produce, and the quenching degree to steel has high demands, so will add raising in steel
Quenching degree element, causes Impurities in steel higher.As the sensing heating time is short, impurity can not be completely dissolved, in original Austria
Family name's body crystal boundary is assembled, and causes rod iron delayed fracture problem.Rod iron intensity is higher, and delayed fracture sensitiveness is bigger.Simultaneously as
Sensing heating speed is fast, original austenite grains refinement, and the yield tensile ratio of rod iron is high, uniformly extends little, is ruptured after surrender rapidly.
Due to delayed fracture and yield tensile ratio height, often accidents happened, is prohibited from using in the important use such as building and sleeper.
Content of the invention
The present invention provides a kind of method for being directly produced prestressed steel bar using burning optimization on line, its object is to solve prior art
The high problem of the rod iron delayed fracture of presence and yield tensile ratio, save energy, reduces the production cost of rod iron.
For this purpose, the technical solution taken by the present invention is：
A kind of method that prestressed steel bar is directly produced using burning optimization on line, it is characterised in that：
By heating steel billet to 900～950 DEG C, roll in horizontally and vertically alternative rod-rolling mill, wire surface is rolled out spiral by finished frame
Rib；Rear water-cooled adjustment temperature is rolled, is spun in 880～900 DEG C；By wire loop cloth on roller transport machine 5～6s, make temperature reply
Uniform to surface and internal temperature；Then the wire loop of a steel spinning is entered EDC quenching tank direct quenching incessantly, according to
Water temperature in steel grade and diameter different choice quenching tank, for 30MnSi steel：A diameter of 7.1～10.7mm, 10～15 DEG C of water temperature；
A diameter of 12.6～14mm, 5～10 DEG C of water temperature；For 35Si2Mn steel：7.1～10.7mm of diameter, 15～20 DEG C of water temperature；
12.6～14mm of diameter, 10～15 DEG C of water temperature；And pass through to inject cold water into quenching tank, make the water in quenching tank form vortex,
Ensure wire loop through hardening, form martensitic structure；After quenching, wire rod is put into the hook of PF chain through roller transport to Ji Juan area after collection volume
On, enter tempering furnace and be tempered, 390～450 DEG C of temperature, 10～30min of time, making up to precompression rod iron performance will
Ask, then packaging and warehousing.
Beneficial effects of the present invention are：
The present invention rolls spiral ribs (groove) wire rod in wire rolling plants, adopts EDC device direct quenching after rolling, online tempering, by
Long in the heating steel billet time, impurity is fully dissolved in austenite, will not assemble in crystal boundary, and the delayed fracture so as to solving rod iron is asked
Topic.As crystal grain is bigger than sensing heating after hot rolling, yield tensile ratio can be reduced, the uniform extension property of rod iron is improved, can effectively solving
The high problem of the yield tensile ratio of rod iron.Simultaneously as the operations such as mechanical descaling, cold drawn forming, sensing heating are eliminated, can be very big
Save the operation energy and other consume, reduce the production cost of prestressed steel bar.
Specific embodiment
Embodiment 1：
By heating steel billet to 920 DEG C, roll in horizontally and vertically alternative rod-rolling mill, wire surface is rolled out spiral ribs by finished frame；
Rear water-cooled adjustment temperature is rolled, is spun in 885 DEG C.By wire loop cloth on roller transport machine 5.5s, make temperature be returned to surface and interior
Portion's temperature is uniform.Then the wire loop of a steel spinning is entered EDC quenching tank direct quenching incessantly, according to 30MnSi steel,
A diameter of 9.0mm, 13 DEG C of water temperature.And pass through to inject cold water into quenching tank, make the water in quenching tank form vortex, it is ensured that line
Ring through hardening, forms martensitic structure.After quenching, wire rod is put on the hook of PF chain after collection volume, enters through roller transport to Ji Juan area
Enter tempering furnace to be tempered, 410 DEG C of temperature, time 20min, precompression rod iron performance requirement is made up to, then packaging and warehousing.
Embodiment 2：
By heating steel billet to 940 DEG C, roll in horizontally and vertically alternative rod-rolling mill, wire surface is rolled out spiral ribs by finished frame.
Rear water-cooled adjustment temperature is rolled, is spun in 895 DEG C.By wire loop cloth on roller transport machine 5s, make temperature be returned to surface and inside
Temperature is uniform.Then the wire loop of a steel spinning is entered EDC quenching tank direct quenching incessantly, according to 35Si2Mn steel,
Diameter 14mm, 15 DEG C of water temperature.And pass through to inject cold water into quenching tank, make the water in quenching tank form vortex, it is ensured that wire loop is quenched
Thoroughly, martensitic structure is formed；After quenching, wire rod is put on the hook of PF chain after collection volume, enters back through roller transport to Ji Juan area
Stove is tempered, 430 DEG C of temperature, and time 25min makes up to precompression rod iron performance requirement, then packaging and warehousing.
Embodiment 3：
By heating steel billet to 910 DEG C, roll in horizontally and vertically alternative rod-rolling mill, wire surface is rolled out spiral ribs by finished frame；
Rear water-cooled adjustment temperature is rolled, is spun in 882 DEG C.By wire loop cloth on roller transport machine 5.3s, make temperature be returned to surface and interior
Portion's temperature is uniform.Then the wire loop of a steel spinning is entered EDC quenching tank direct quenching incessantly, according to 30MnSi steel,
A diameter of 13.0mm, 9 DEG C of water temperature.And pass through to inject cold water into quenching tank, make the water in quenching tank form vortex, it is ensured that line
Ring through hardening, forms martensitic structure.After quenching, wire rod is put on the hook of PF chain after collection volume, enters through roller transport to Ji Juan area
Enter tempering furnace to be tempered, 420 DEG C of temperature, time 18min, precompression rod iron performance requirement is made up to, then packaging and warehousing.
Embodiment 4：
By heating steel billet to 930 DEG C, roll in horizontally and vertically alternative rod-rolling mill, wire surface is rolled out spiral ribs by finished frame.
Rear water-cooled adjustment temperature is rolled, is spun in 900 DEG C.By wire loop cloth on roller transport machine 5.2s, make temperature be returned to surface and interior
Portion's temperature is uniform.Then the wire loop of a steel spinning is entered EDC quenching tank direct quenching incessantly, according to 35Si2Mn steel,
Diameter 10mm, 18 DEG C of water temperature.And pass through to inject cold water into quenching tank, make the water in quenching tank form vortex, it is ensured that wire loop is quenched
Thoroughly, martensitic structure is formed；After quenching, wire rod is put on the hook of PF chain after collection volume, enters back through roller transport to Ji Juan area
Stove is tempered, 410 DEG C of temperature, and time 28min makes up to precompression rod iron performance requirement, then packaging and warehousing.
Claims (1)
1. a kind of method that prestressed steel bar is directly produced using burning optimization on line, it is characterised in that：
By heating steel billet to 900～950 DEG C, roll in horizontally and vertically alternative rod-rolling mill, finished frame is by wire rod table
Face rolls out spiral ribs；Rear water-cooled adjustment temperature is rolled, is spun in 880～900 DEG C；Wire loop cloth is transported in roller-way
5～6s on defeated machine, makes that temperature is returned to surface and internal temperature is uniform；Then by the wire loop of a steel spinning not
EDC quenching tank direct quenching is discontinuously entered, according to water temperature in steel grade and diameter different choice quenching tank, right
In 30MnSi steel：A diameter of 7.1～10.7mm, 10～15 DEG C of water temperature；A diameter of 12.6～14mm, water temperature
5～10 DEG C；For 35Si2Mn steel：7.1～10.7mm of diameter, 15～20 DEG C of water temperature；12.6～14mm of diameter,
10～15 DEG C of water temperature；And pass through to inject cold water into quenching tank, make the water in quenching tank form vortex, it is ensured that
Wire loop through hardening, forms martensitic structure；After quenching, wire rod is put into PF through roller transport to Ji Juan area after collection volume
On the hook of chain, enter tempering furnace and be tempered, 390～450 DEG C of temperature, 10～30min of time, it is allowed to
Precompression rod iron performance requirement is reached, then packaging and warehousing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510524702.4A CN106480260A (en) | 2015-08-24 | 2015-08-24 | Method for directly producing prestressed steel bar by adopting online heat treatment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510524702.4A CN106480260A (en) | 2015-08-24 | 2015-08-24 | Method for directly producing prestressed steel bar by adopting online heat treatment |
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| CN106480260A true CN106480260A (en) | 2017-03-08 |
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| CN201510524702.4A Pending CN106480260A (en) | 2015-08-24 | 2015-08-24 | Method for directly producing prestressed steel bar by adopting online heat treatment |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108165715A (en) * | 2018-02-13 | 2018-06-15 | 葫芦岛市北方金属制品有限公司 | A kind of method using thermomechanical treatment production prestressed steel bar |
| CN115637373A (en) * | 2022-08-08 | 2023-01-24 | 辛集市澳森钢铁集团有限公司 | Preparation method of hot-rolled wire rod for prestressed concrete steel bar |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1097659A (en) * | 1994-05-25 | 1995-01-25 | 冶金工业部钢铁研究总院 | The warm rolling method of spiral |
| CN1453375A (en) * | 2002-04-28 | 2003-11-05 | 鞍钢集团新钢铁有限责任公司 | Continuous induction heat treatment process for high-strength finish-rolled spiral steel bar |
| CN1760396A (en) * | 2004-10-12 | 2006-04-19 | 昆明钢铁股份有限公司 | Dedicated base material for making nails and cold rolling reinforced steel bar with ribs |
| CN1760394A (en) * | 2004-10-12 | 2006-04-19 | 昆明钢铁股份有限公司 | Dedicated base material for cold rolling reinforced steel-bar with ribs in low alloy |
| CN1760397A (en) * | 2004-10-12 | 2006-04-19 | 昆明钢铁股份有限公司 | Parent metal dedicated to drawn or cold rolled reinforcing steel bar with ribs |
| CN1760395A (en) * | 2004-10-12 | 2006-04-19 | 昆明钢铁股份有限公司 | Parent metal dedicated to cold rolled reinforcing steel bar with ribs |
| CN101185938A (en) * | 2006-11-09 | 2008-05-28 | 钢铁研究总院 | Method for producing steel bar with rib |
| CN101514390A (en) * | 2009-04-03 | 2009-08-26 | 营口市九隆精制螺纹有限公司 | Method for producing high-strength finishing rolling threaded steel bar by online hardening and tempering technology |
| JP2010222630A (en) * | 2009-03-23 | 2010-10-07 | Kobe Steel Ltd | Method for producing high-carbon steel wire rod excellent in drawability |
-
2015
- 2015-08-24 CN CN201510524702.4A patent/CN106480260A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1097659A (en) * | 1994-05-25 | 1995-01-25 | 冶金工业部钢铁研究总院 | The warm rolling method of spiral |
| CN1453375A (en) * | 2002-04-28 | 2003-11-05 | 鞍钢集团新钢铁有限责任公司 | Continuous induction heat treatment process for high-strength finish-rolled spiral steel bar |
| CN1760396A (en) * | 2004-10-12 | 2006-04-19 | 昆明钢铁股份有限公司 | Dedicated base material for making nails and cold rolling reinforced steel bar with ribs |
| CN1760394A (en) * | 2004-10-12 | 2006-04-19 | 昆明钢铁股份有限公司 | Dedicated base material for cold rolling reinforced steel-bar with ribs in low alloy |
| CN1760397A (en) * | 2004-10-12 | 2006-04-19 | 昆明钢铁股份有限公司 | Parent metal dedicated to drawn or cold rolled reinforcing steel bar with ribs |
| CN1760395A (en) * | 2004-10-12 | 2006-04-19 | 昆明钢铁股份有限公司 | Parent metal dedicated to cold rolled reinforcing steel bar with ribs |
| CN101185938A (en) * | 2006-11-09 | 2008-05-28 | 钢铁研究总院 | Method for producing steel bar with rib |
| JP2010222630A (en) * | 2009-03-23 | 2010-10-07 | Kobe Steel Ltd | Method for producing high-carbon steel wire rod excellent in drawability |
| CN101514390A (en) * | 2009-04-03 | 2009-08-26 | 营口市九隆精制螺纹有限公司 | Method for producing high-strength finishing rolling threaded steel bar by online hardening and tempering technology |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108165715A (en) * | 2018-02-13 | 2018-06-15 | 葫芦岛市北方金属制品有限公司 | A kind of method using thermomechanical treatment production prestressed steel bar |
| CN115637373A (en) * | 2022-08-08 | 2023-01-24 | 辛集市澳森钢铁集团有限公司 | Preparation method of hot-rolled wire rod for prestressed concrete steel bar |
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Application publication date: 20170308 |