CN103741078A - Remained heat treatment steel bar production process - Google Patents
Remained heat treatment steel bar production process Download PDFInfo
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- CN103741078A CN103741078A CN201310746603.1A CN201310746603A CN103741078A CN 103741078 A CN103741078 A CN 103741078A CN 201310746603 A CN201310746603 A CN 201310746603A CN 103741078 A CN103741078 A CN 103741078A
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Abstract
The invention discloses a remained heat treatment steel bar production process, which comprises the following steps of inspecting and charging a steel billet into a furnace, wherein the steel billet comprises the following chemical components in percentage by mass: less than 0.25 percent of carbon, less than 0.50 percent of silicon, less than 0.80 percent of manganese, less than 0.045 percent of phosphorus, less than 0.045 percent of sulfur, 0.30 to 0.60 percent of chromium and the balance of iron; heating the steel billet by using a heating furnace, and rolling the steel billet by using a bar rolling mill; performing water cooling; and performing self-tempering by using a cooling bed, and performing shearing finishing and warehousing. According to the remained heat treatment steel bar production process, the chromium alloying component is adopted, so that the hardenability during water cooling is improved, the tempering stability can be improved, and the corrosion resistance of a steel bar is improved; a low-temperature initial rolling mode is adopted, the cooling pressure of equipment can be reduced, the energy consumption can further be reduced, and the process is consistent with the development path of the iron and steel industry; due to the use of a tempered structure, the mechanical performance of steel is improved, the hardening depth of the steel bar is ensured to a certain extent, and a closed-loop tempered structure which is thick enough can be conveniently produced.
Description
Technical field
The present invention relates to a kind of reinforcing bar production technique, relate in particular to a kind of waste heat treatment steel bar production technique.
Background technology
Deformed Steel Bars standard GB/T 1499.2-2007 < < concrete reinforcement steel part 2: in hot rolled ribbed steel bar > >: the reinforcing bar of pressing hot-rolled state delivery, its metallographic structure is mainly that ferrite adds perlite, must not have its hetero-organization that affects use properties to exist.Therefore the Deformed Steel Bars of producing by GB all adopts hot-rolled production process.
In Deformed Steel Bars English mark standard BS4449:1997 < < the reinforcement of concrete carbon steel reinforcing bar > > and BS4449:2005 < < welding steel muscle for Steel Concrete (reinforcing bar, coil reinforcing bar and uncoiling product) technical specifications > > to the condition of delivery of reinforcing bar for doing requirement, can adopt hot rolling technology to produce, also can adopt Heat Treatment explained hereafter.
Adopt hot-rolled production process to produce, can not effectively bring into play the performance potential of steel, and alloy content is relatively high, resource consumption is larger, and production cost is relatively high, is unfavorable for reducing resource consumption and energy-saving and emission-reduction.
Summary of the invention
In view of the defect that above-mentioned prior art exists, the object of the invention is to propose a kind of waste heat treatment steel bar production technique.
Object of the present invention, will be achieved by the following technical programs: a kind of waste heat treatment steel bar production technique, is characterized in that comprising the steps:
I, steel billet check shove charge: steel billet Chemical Composition by mass percentage comprises the carbon below 0.25%, the silicon below 0.50%, the manganese below 0.80%, the phosphorus below 0.045%, the sulphur below 0.045%, 0.30%～0.60% chromium, and all the other are iron;
The heating of II, process furnace and merchant bar mill rolling: steel billet is heated in process furnace, and be rolled into work in-process reinforcing bar send into merchant bar mill at 950 ℃～1050 ℃ of temperature in;
III, wear water cooling: adopt Venturi meter wear water-chilling plant set wear water pressure 1.4MPa above, wear discharge 300m per hour
3set the work in-process reinforcing bar cooling of the corresponding water cooling time of wearing to institute's rolling above and according to bar gauge;
IV, cold bed self-tempering: when work in-process reinforcing bar temperature is down to below 600 ℃, put into cold bed;
V, shearing finishing warehouse-in.
Preferably, in step III, to wear the water cooling time be more than 0.7 second to the reinforcing bar of corresponding φ=10～25mm, and it is more than 2.5 seconds that the reinforcing bar of corresponding φ=28～50mm is worn the water cooling time.
Preferably, in step I, steel billet Chemical Composition by mass percentage comprises carbon 0.21%, silicon 0.21%, and manganese 0.26%, phosphorus 0.022%, sulphur 0.021%, chromium 0.32%, all the other are iron.
Preferably, in step I, steel billet Chemical Composition by mass percentage comprises carbon 0.22%, silicon 0.23%, and manganese 0.45%, phosphorus 0.017%, sulphur 0.024%, chromium 0.38%, all the other are iron.
Preferably, in step I, steel billet Chemical Composition by mass percentage comprises carbon 0.21%, silicon 0.2%, and manganese 0.65%, phosphorus 0.009%, sulphur 0.029%, chromium 0.45%, all the other are iron.
Waste heat treatment steel bar production technique of the present invention adopts chromium alloying composition, hardening capacity while utilizing chromium increase to wear water cooling, chromium can improve temper resistance, increase the resistance to corrosion of reinforcing bar simultaneously, adopt low temperature open rolling can reduce the cooling pressure of equipment, can further reduce energy consumption simultaneously, meet steel industry road for development, utilize tempered structure to improve the mechanical property of steel, guarantee that reinforcing bar has certain depth of hardening, be convenient to produce the closed loop tempered structure of adequate thickness.
Embodiment
Below just the specific embodiment of the present invention is described in further detail, so that technical solution of the present invention is easier to understand, grasp.
A kind of waste heat treatment steel bar production technique, especially, comprise the steps: I, steel billet check shove charge: steel billet Chemical Composition by mass percentage comprises the carbon below 0.25%, the silicon below 0.50%, the manganese below 0.80%, the phosphorus below 0.045%, the sulphur below 0.045%, 0.30%～0.60% chromium, and all the other are iron; The heating of II, process furnace and merchant bar mill rolling: steel billet is heated in process furnace, and be rolled into work in-process reinforcing bar send into merchant bar mill at 950 ℃～1050 ℃ of temperature in; III, wear water cooling: adopt Venturi meter wear water-chilling plant set wear water pressure 1.4MPa above, wear discharge 300m per hour
3set the work in-process reinforcing bar cooling of the corresponding water cooling time of wearing to institute's rolling above and according to bar gauge; IV, cold bed self-tempering: when work in-process reinforcing bar temperature is down to below 600 ℃, put into cold bed; V, shearing finishing warehouse-in.
Specifically: waste heat treatment steel bar production technique of the present invention adopts chromium alloying composition, is mainly the hardening capacity while utilizing chromium increase to wear water cooling, and chromium can improve temper resistance, increases the resistance to corrosion of reinforcing bar simultaneously.
Waste heat treatment steel bar production technique has adopted chromium alloying composition, after rolling, need to wear by force water cooling, require that reinforcing bar is cooling reaches below 600 ℃, to equipment to wear water cooling Capability Requirement high, adopt low temperature open rolling can reduce the cooling pressure of equipment, can further reduce energy consumption, meet steel industry road for development, therefore start rolling temperature is set as 950～1050 ℃ simultaneously.
Waste heat treatment steel bar production technique is mainly to produce tempered structure by reinforcing bar self-tempering, utilize tempered structure to improve the mechanical property of steel, guarantee that reinforcing bar has certain depth of hardening, be convenient to produce the closed loop tempered structure of adequate thickness, according to self-tempering, organize generating principle, the upper cold bed temperature of reinforcing bar is set as≤and 600 ℃.
Waste heat treatment steel bar production technique is produced and is covered φ 10～φ 50mm, and large specification is relatively high to the cooling Capability Requirement of equipment, and common water cooling equipment cannot meet large specification cooling requirement, therefore adopt Venturi meter water cooling equipment.
Roll in the control of rear water cooling equipment parameter, worn water cooling pressure, flow and worn water cooling Time dependent reinforcing bar depth of hardening and quench after temperature, the too low meeting of pressure, flow and time causes reinforcing bar quenched case excessively shallow, thereby the tempered structure that cannot form adequate thickness causes steel bar mechanics performance not reach requirement.Therefore wear be set as>=1.4MPa of water pressure, wear discharge>=300m
3/ h, wears the water cooling time to be set as φ 10～φ 25mm>=0.7 second, and φ 28～φ 50mm>=2.5 second, to guarantee the self-tempering ability of reinforcing bar.
Wherein, in step III, to wear the water cooling time be more than 0.7 second to the reinforcing bar of corresponding φ=10～25mm, and it is more than 2.5 seconds that the reinforcing bar of corresponding φ=28～50mm is worn the water cooling time.
Embodiment mono-, produces φ 10mm reinforcing bar, and steel billet Chemical Composition by mass percentage comprises carbon 0.21%, silicon 0.21%, and manganese 0.26%, phosphorus 0.022%, sulphur 0.021%, chromium 0.32%, all the other are iron.The control of operation of rolling temperature is as follows: approximately 1030 ℃ of start rolling temperatures, approximately 580 ℃ of upper cold bed temperatures.Wear the control of water cooling parameter as follows: wear water pressure 1.7MPa, wear the about 500m3/h of discharge, finish to gauge speed 13m/s, wears 0.80 second water cooling time.
Final mechanical property Rel is 575～609MPa, and Rm is 654～686 MPa, and Rm/Rel is that 1.11～1.14, Agt is 7.5～8.5%; All indexs meet the requirement of English mark relevant criterion.
Embodiment bis-, produces φ 20mm reinforcing bar, and steel billet Chemical Composition by mass percentage comprises carbon 0.22%, silicon 0.23%, and manganese 0.45%, phosphorus 0.017%, sulphur 0.024%, chromium 0.38%, all the other are iron.The control of operation of rolling temperature is as follows: approximately 1000 ℃ of start rolling temperatures, approximately 570 ℃ of upper cold bed temperatures.Wear the control of water cooling parameter as follows: wear water pressure 1.7MPa, wear the about 750m3/h of discharge, finish to gauge speed 11m/s, wears 1.3 seconds water cooling time.
Final mechanical property Rel is 562～592MPa, and Rm is 651～670 MPa, and Rm/Rel is that 1.12～1.16, Agt is 7.5～9.0%; All indexs meet the requirement of English mark relevant criterion.
Embodiment tri-, produces φ 40mm reinforcing bar, and in step I, steel billet Chemical Composition by mass percentage comprises carbon 0.21%, silicon 0.2%, and manganese 0.65%, phosphorus 0.009%, sulphur 0.029%, chromium 0.45%, all the other are iron.The control of operation of rolling temperature is as follows: approximately 1000 ℃ of start rolling temperatures, approximately 570 ℃ of upper cold bed temperatures.Wear the control of water cooling parameter as follows: wear water pressure 1.7MPa, wear the about 950m3/h of discharge, finish to gauge speed 4m/s, wears 4.3 seconds water cooling time.
Final mechanical property Rel is 588～607MPa, and Rm is 674～689 MPa, and Rm/Rel is that 1.13～1.15, Agt is 8.5～9.5%; All indexs meet the requirement of English mark relevant criterion.
Visible by above description: waste heat treatment steel bar production technique of the present invention adopts chromium alloying composition, hardening capacity while utilizing chromium increase to wear water cooling, chromium can improve temper resistance, increase the resistance to corrosion of reinforcing bar simultaneously, adopt low temperature open rolling can reduce the cooling pressure of equipment, can further reduce energy consumption simultaneously, meet steel industry road for development, utilize tempered structure to improve the mechanical property of steel, guarantee that reinforcing bar has certain depth of hardening, be convenient to produce the closed loop tempered structure of adequate thickness.
The present invention still has numerous embodiments, and all employing equivalents or equivalent transformation and all technical schemes of forming, within all dropping on protection scope of the present invention.
Claims (5)
1. a waste heat treatment steel bar production technique, is characterized in that comprising the steps:
I, steel billet check shove charge: steel billet Chemical Composition by mass percentage comprises the carbon below 0.25%, the silicon below 0.50%, the manganese below 0.80%, the phosphorus below 0.045%, the sulphur below 0.045%, 0.30%～0.60% chromium, and all the other are iron;
The heating of II, process furnace and merchant bar mill rolling: steel billet is heated in process furnace, and be rolled into work in-process reinforcing bar send into merchant bar mill at 950 ℃～1050 ℃ of temperature in;
III, wear water cooling: adopt Venturi meter wear water-chilling plant set wear water pressure 1.4MPa above, wear discharge 300m per hour
3set the work in-process reinforcing bar cooling of the corresponding water cooling time of wearing to institute's rolling above and according to bar gauge;
IV, cold bed self-tempering: when work in-process reinforcing bar temperature is down to below 600 ℃, put into cold bed;
V, shearing finishing warehouse-in.
2. waste heat treatment steel bar production technique according to claim 1, is characterized in that: in step III, to wear the water cooling time be more than 0.7 second to the reinforcing bar of corresponding φ=10～25mm, and it is more than 2.5 seconds that the reinforcing bar of corresponding φ=28～50mm is worn the water cooling time.
3. waste heat treatment steel bar production technique according to claim 1, is characterized in that: in step I, steel billet Chemical Composition by mass percentage comprises carbon 0.21%, silicon 0.21%, and manganese 0.26%, phosphorus 0.022%, sulphur 0.021%, chromium 0.32%, all the other are iron.
4. waste heat treatment steel bar production technique according to claim 1, is characterized in that: in step I, steel billet Chemical Composition by mass percentage comprises carbon 0.22%, silicon 0.23%, and manganese 0.45%, phosphorus 0.017%, sulphur 0.024%, chromium 0.38%, all the other are iron.
5. waste heat treatment steel bar production technique according to claim 1, is characterized in that: in step I, steel billet Chemical Composition by mass percentage comprises carbon 0.21%, silicon 0.2%, and manganese 0.65%, phosphorus 0.009%, sulphur 0.029%, chromium 0.45%, all the other are iron.
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| CN201310746603.1A CN103741078A (en) | 2013-12-31 | 2013-12-31 | Remained heat treatment steel bar production process |
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| CN201310746603.1A CN103741078A (en) | 2013-12-31 | 2013-12-31 | Remained heat treatment steel bar production process |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106319180A (en) * | 2016-08-31 | 2017-01-11 | 云南德胜钢铁有限公司 | Machining technology of anti-knock reinforcing steel bars |
| CN106967928A (en) * | 2017-03-22 | 2017-07-21 | 北京交通大学 | A kind of 650MPa grade high-strengths anti-seismic steel bar steel and preparation method thereof |
| CN112775181A (en) * | 2020-12-28 | 2021-05-11 | 江苏省镔鑫钢铁集团有限公司 | Corrosion-resistant deformed steel bar and preparation method and manufacturing device thereof |
| CN112857861A (en) * | 2021-01-19 | 2021-05-28 | 南京钢铁股份有限公司 | Sampling and shearing method for steel for pressure container |
| CN116657052A (en) * | 2023-05-26 | 2023-08-29 | 本钢板材股份有限公司 | Low-cost steel for deformed bar and preparation method thereof |
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| CN1793389A (en) * | 2005-12-26 | 2006-06-28 | 广州双菱钢铁工业有限公司 | Process for producing British standard 460 grade thread reinforcing steel by ordinary carbon steel |
| CN1792484A (en) * | 2005-12-26 | 2006-06-28 | 广州双菱钢铁工业有限公司 | Method for producing 500 Mpa high strengh threaded reinforced bar |
| CN101275197A (en) * | 2007-07-19 | 2008-10-01 | 天津钢铁有限公司 | High-strength rebar and manufacturing process thereof |
| CN103451553A (en) * | 2013-08-29 | 2013-12-18 | 莱芜钢铁集团有限公司 | Reinforced bar used in ultra-low temperature environments and preparation method thereof |
-
2013
- 2013-12-31 CN CN201310746603.1A patent/CN103741078A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1793389A (en) * | 2005-12-26 | 2006-06-28 | 广州双菱钢铁工业有限公司 | Process for producing British standard 460 grade thread reinforcing steel by ordinary carbon steel |
| CN1792484A (en) * | 2005-12-26 | 2006-06-28 | 广州双菱钢铁工业有限公司 | Method for producing 500 Mpa high strengh threaded reinforced bar |
| CN101275197A (en) * | 2007-07-19 | 2008-10-01 | 天津钢铁有限公司 | High-strength rebar and manufacturing process thereof |
| CN103451553A (en) * | 2013-08-29 | 2013-12-18 | 莱芜钢铁集团有限公司 | Reinforced bar used in ultra-low temperature environments and preparation method thereof |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106319180A (en) * | 2016-08-31 | 2017-01-11 | 云南德胜钢铁有限公司 | Machining technology of anti-knock reinforcing steel bars |
| CN106967928A (en) * | 2017-03-22 | 2017-07-21 | 北京交通大学 | A kind of 650MPa grade high-strengths anti-seismic steel bar steel and preparation method thereof |
| CN112775181A (en) * | 2020-12-28 | 2021-05-11 | 江苏省镔鑫钢铁集团有限公司 | Corrosion-resistant deformed steel bar and preparation method and manufacturing device thereof |
| CN112857861A (en) * | 2021-01-19 | 2021-05-28 | 南京钢铁股份有限公司 | Sampling and shearing method for steel for pressure container |
| CN116657052A (en) * | 2023-05-26 | 2023-08-29 | 本钢板材股份有限公司 | Low-cost steel for deformed bar and preparation method thereof |
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Application publication date: 20140423 |