CN102352462B - Anchor rod rebar with high strength and high impact toughness and preparation method thereof - Google Patents
Anchor rod rebar with high strength and high impact toughness and preparation method thereof Download PDFInfo
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- CN102352462B CN102352462B CN2011102942742A CN201110294274A CN102352462B CN 102352462 B CN102352462 B CN 102352462B CN 2011102942742 A CN2011102942742 A CN 2011102942742A CN 201110294274 A CN201110294274 A CN 201110294274A CN 102352462 B CN102352462 B CN 102352462B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The invention provides an anchor rod rebar with high strength and high impact toughness and a preparation method thereof, belonging to the technical field of steel for mine support. The anchor rod rebar comprises the following chemical components by weight percent: 0.10-0.40% of C, 0.10-1.0% of Si, 0.25-2.00% of Mn and the balance of iron and inevitable impurities. In the preparation method, continuous quenching and tempering are carried out on raw materials so as to obtain a finished product, wherein the quenching heating temperature is 850-1000 DEG C so that a structure is austenitized; and the tempering temperature is 350-650 DEG C, the structure of the finished product comprises a tempered structure of martensite and a small amount of ferrite. The rebar produced by the process has yield strength grade of 600-785 MPa, room-temperature impact toughness AKV value of not less than 80 J and good plasticity; and by using the process, support strength is improved, and capability of bearing impact ground pressure is strong, thereby further guaranteeing safety and reducing steel consumption.
Description
Technical field
The invention belongs to mine support steel technical field, anchor pole reinforcing bar of a kind of high-strength high impact toughness and preparation method thereof particularly is provided, be applicable to the anchor pole reinforcing bar for the high-strength high impact toughness of the support engineerings such as colliery.
Background technology
China is maximum in the world well industrial and mineral coal production state, and the buried depths more than half of coal resources total amount are greater than 1000m, along with mining depth is constantly deepened, deep production has brought high terrestrial stress, high rock burst and large rheological behavior of surrounding rocks, cause serious difficulty for the bolt supporting of coal road, need more high-intensity anchor pole to guarantee safety in production.Simultaneously, the bolt supporting process is " bottleneck " that hinders the coal mining progress, and the time shared in a working face is mined circulation is the longest, is conducive to reduce bolt supporting density and improve anchor rod strength, not only reduce steel consumption, can also significantly improve integrated construction efficient.Anchor pole also is used widely in fields such as slope of highway improvement, tunnel support, the supporting of deep basal pit prestressed anchor, dam body side slope protections except being used for colliery tunnel support.
For many years, the anchor pole reinforcing bar of China all is hot-rolled product substantially, generally adopts 335MPa level steel, and minority has reached the 500MPa level.Recently adopt hot-rolling method to produce out the anchor pole reinforcing bar that the yield strength rank reaches 600MPa as a trial, but its room temperature impelling strength index A
KVValue can only reach 30-40J, can't press with withstanding shocks and the colliery in strongly adopt, affect supporting safety, the exploitation with anchor pole reinforcing bar of higher comprehensive mechanical property demands urgently carrying out.
The off-line heat treating method can change material microstructure significantly promotes its mechanical property, obtains rational properties configuration by the control to organizational composition.High-strength high impact toughness anchor pole reinforcing bar disclosed by the invention is a kind of novel anchor rod product that adopts heat treating method to produce, not only can reach higher intensity and plasticity index, has simultaneously higher impelling strength performance, can further ensure engineering safety, and the minimizing steel consumption, low-carbon economy and energy-saving and emission-reduction are produced significance.
Summary of the invention
The object of the invention provides anchor pole reinforcing bar of a kind of high-strength high impact toughness and preparation method thereof, is used for the support engineerings such as colliery, more than its yield strength 600-785MPa, and impelling strength A
KVValue is not less than 80J, and plasticity is higher.
Raw material of the present invention is gren rod, and its chemical composition weight percentage is: the chemical composition weight percentage is: carbon: 0.10-0.40%, and silicon: 0.10-1.0%, manganese: 0.25-2.00%, surplus is iron and inevitable impurity; Finished product is organized as tempered sorbite and a small amount of ferrite; After the thermal treatment of hot-rolled reinforced bar by quenching, tempering, its yield strength grade reaches 600-785MPa, room temperature impelling strength A
KVValue is not less than 80J, and elongation after fracture A is not less than 15.0%, elongation A under the maximum, force
GtBe not less than 4.0%, the product nominal diameter is 16-32mm; Profile is with ribbing or screw thread.
If necessary, also can contain the alloying elements such as the V of 0.01-0.20 % by weight or Ti.
Preparation method of the present invention carries out the thermal treatment of Q-tempering to the raw material gren rod, the technical parameter of controlling in thermal treatment is: way of electromagnetic induction is all adopted in quenching and tempering heating, the average rate of heating of induction furnace is 7-100 ℃/s, quenching temperature is 850-1000 ℃, make and organize austenitizing, it is cold to carry out rapid water after the 5-20 insulation of second, is down to below 300 ℃ in temperature within the 5s, and austenite is quenched into martensite; The tempering Heating temperature is 350-700 ℃, is cooled to room temperature after the soaking time through being no more than 1 minute; Finished product is organized as martensitic tempered structure and a small amount of ferrite.
All heat treatment processes are carried out uninterruptedly continuously, raw material reinforcing bar heat-treating by production line continuously one by one.
The finished product nominal diameter is 16-32mm, and profile is with ribbing or screw thread, and the yield strength grade is 600-785MPa, and room temperature impelling strength is not less than 80J, and elongation after fracture A is not less than 15.0%, elongation A under the maximum, force
GtBe not less than 4.0%.
Compared with prior art, beneficial effect of the present invention is:
Room temperature impact absorbing energy A with reinforcing bar
KVValue is increased to more than the 80J, and while intensity is more than 600-785MPa, and the hot-rolled reinforced bar maximum intensity can arrive the 600MPa level, and impact property only is 30J to 40J even lower.
Reduce the alloy content of Si, Mn, V, Ti, only promoted material mechanical performance by heat treatment process, can significantly reduce raw materials cost.
Embodiment
Below in conjunction with case introduction the specific embodiment of the present invention.
Embodiment 1
A kind of hot-rolled reinforced bar, nominal diameter are 20mm, and this reinforcing bar comprises the C of 0.18wt%, the Si of 0.51wt%, and the Mn of 1.38wt%, all the other are iron and inevitable impurity.The sensed process furnace of this reinforcing bar was heated to 950 ℃ by room temperature in 3 seconds, through carrying out water cooling after the insulation of 2s, through induction heating to 650 ℃, water-cooled behind the insulation 5s obtains finished product anchor pole reinforcing bar again.
The average room temperature impact absorbing energy A of this reinforcing bar
KVValue is 144J, and yield strength is 655MPa, and tensile strength is 750MPa, and elongation after fracture A is 22.0%, elongation A under the maximum, force
GtBe 7.0%.
Embodiment 2
A kind of hot-rolled reinforced bar, nominal diameter are 22mm, and this reinforcing bar comprises the C of 0.22wt%, the Si of 0.58wt%, and the Mn of 1.40wt%, the V of 0.09wt%, all the other are iron and inevitable impurity.The sensed process furnace of this reinforcing bar was heated to 940 ℃ by room temperature in 3 seconds, through carrying out water cooling after the insulation of 2s, through induction heating to 550 ℃, water-cooled behind the insulation 5s obtains finished product anchor pole reinforcing bar again.
The average room temperature impact absorbing energy A of this reinforcing bar
KVValue is 105J, and yield strength is 820MPa, and tensile strength is 895MPa, and elongation after fracture A is 19.0%, elongation A under the maximum, force
GtBe 6.5%.
Claims (3)
1. the anchor pole reinforcing bar of a high-strength high impact toughness, it is characterized in that: the chemical composition weight percentage is: carbon: 0.10-0.40%, silicon: 0.10-1.0%, manganese: 0.25-2.00%, surplus is iron and inevitable impurity; Finished product is organized as tempered sorbite and a small amount of ferrite; After the thermal treatment of hot-rolled reinforced bar by quenching, tempering, its yield strength grade reaches 600-785MPa, room temperature impelling strength A
KVValue is not less than 80J, and elongation after fracture A is not less than 15.0%, elongation A under the maximum, force
GtBe not less than 4.0%; The product nominal diameter is 16-32mm.
2. anchor pole reinforcing bar according to claim 1, it is characterized in that: chemical composition also comprises V or the Ti of 0.01-0.20 % by weight.
3. the preparation method of a claim 1 or 2 described anchor pole reinforcing bars, the thermal treatment of the raw material gren rod being carried out Q-tempering, it is characterized in that, the technical parameter of controlling in thermal treatment is: way of electromagnetic induction is all adopted in quenching and tempering heating, and the average rate of heating 7-100 of induction furnace ℃/s, quenching temperature is 850-1000 ℃, make and organize austenitizing, it is cold to carry out rapid water after the 5-20 insulation of second, is down to below 300 ℃ in temperature within the 5s, and austenite is quenched into martensite; The tempering Heating temperature is 350-700 ℃, is cooled to room temperature after the soaking time through being no more than 1 minute; Finished product is organized as martensitic tempered structure and a small amount of ferrite.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011102942742A CN102352462B (en) | 2011-09-28 | 2011-09-28 | Anchor rod rebar with high strength and high impact toughness and preparation method thereof |
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| CN2011102942742A CN102352462B (en) | 2011-09-28 | 2011-09-28 | Anchor rod rebar with high strength and high impact toughness and preparation method thereof |
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| CN102352462A CN102352462A (en) | 2012-02-15 |
| CN102352462B true CN102352462B (en) | 2013-03-20 |
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| CN2011102942742A Expired - Fee Related CN102352462B (en) | 2011-09-28 | 2011-09-28 | Anchor rod rebar with high strength and high impact toughness and preparation method thereof |
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Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102816971B (en) * | 2012-08-15 | 2014-01-01 | 安阳龙腾特钢制造有限公司 | Ultra high strength anchor pile with impact energy more than 100 J and manufacturing process thereof |
| CN104141093B (en) * | 2013-05-10 | 2016-04-13 | 河北钢铁股份有限公司承德分公司 | Yield strength reaches motor vehicle body band steel and the rolling method thereof of 700MPa |
| CN104404192B (en) * | 2014-11-07 | 2016-09-14 | 首钢水城钢铁（集团）有限责任公司 | A kind of production method of anchor bar steel |
| CN104532162A (en) * | 2014-12-13 | 2015-04-22 | 广西科技大学 | Formula of high-strength steel bar |
| CN105714034A (en) * | 2015-03-19 | 2016-06-29 | 范玫光 | Prestressed anchor bolt used for wind power foundation and induction heating heat treatment method thereof |
| CN104946987A (en) * | 2015-05-28 | 2015-09-30 | 武汉钢铁(集团)公司 | High-strength finish rolled steel bar and production method thereof |
| CN106048153A (en) * | 2016-07-20 | 2016-10-26 | 柳州科尔特锻造机械有限公司 | Rapid heat treatment technology for alloy steel |
| CN106048173A (en) * | 2016-07-20 | 2016-10-26 | 柳州科尔特锻造机械有限公司 | Heat treatment method for alloy steel |
| CN106399848A (en) * | 2016-09-19 | 2017-02-15 | 石横特钢集团有限公司 | High-toughness MG500 anchor rod reinforcing steel bar and production method thereof |
| CN113804557A (en) * | 2021-09-16 | 2021-12-17 | 青海大学 | Detection method for simulating yield strength of steel bar after fire |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000144320A (en) * | 1998-11-10 | 2000-05-26 | Kawasaki Steel Corp | Deformed bar steel for reinforcing bar and its production |
| UA79213C2 (en) * | 2003-05-28 | 2007-05-25 | Sumitomo Metal Ind | Extended at laying steel pipe for oil-well (variants) |
| CN102061370A (en) * | 2011-01-31 | 2011-05-18 | 中国钢研科技集团有限公司 | Production process of rebar for concrete |
| CN102121082A (en) * | 2011-01-31 | 2011-07-13 | 中国钢研科技集团有限公司 | Production method of reinforcing steel bar used as stirrup |
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Application publication date: 20120215 Assignee: Beijing Gangyan New Metallurgical Engineering Technology Center Co Ltd Assignor: China Gangyan Technology Group Limited|Xinye High-Tech Group Co. Ltd. Contract record no.: 2014110000014 Denomination of invention: Anchor rod rebar with high strength and high impact toughness and preparation method thereof Granted publication date: 20130320 License type: Exclusive License Record date: 20140408 |
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