CN102816971B - Ultra high strength anchor pile with impact energy more than 100 J and manufacturing process thereof - Google Patents
Ultra high strength anchor pile with impact energy more than 100 J and manufacturing process thereof Download PDFInfo
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- CN102816971B CN102816971B CN201210289251.7A CN201210289251A CN102816971B CN 102816971 B CN102816971 B CN 102816971B CN 201210289251 A CN201210289251 A CN 201210289251A CN 102816971 B CN102816971 B CN 102816971B
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Abstract
The present invention discloses an ultra high strength pile with impact energy more than 100 J and a manufacturing process thereof. The pile has the following characteristics that: a diameter is 16-40 mm, a length is 2-12 m, a shape can be plain round, a longitudinal rib-free crescent rib (levulorotation or dextrorotation), or a longitudinal rib-free thread rib (levulorotation or dextrorotation), a yield strength is 600-830 MPa, a room temperature impact absorbing energy AKV2 is not less than 100 J, and components comprise 0.1-0.5% of C, 0.3-1.0% of Si, 0.5-1.5 % of Mn, less than or equal to 0.035% of S, less than or equal to 0.035% of P, and the balance of Fe, wherein an appropriate amount of V, Ti and Nb can be added. According to the present invention, rapid heating is adopted, wherein a heating temperature does not exceed 850 DEG C; water cooling and tempering are performed, wherein a tempering temperature does not exceed 550 DEG C; and a water cooling process is performed again to obtain a composite phase structure of ferrite, martensite, and residual austenite, wherein the structure has a good roof plate layer resistance pressure impact performance.
Description
Technical field: the present invention relates to mining supports anchor pole and production method thereof.
Technical background: the China at present seam mining degree of depth in colliery drives into the speed that increases every year on average 9m, and adopting the mine that deeply is greater than 700m has more than 50 places, the darkest 1000m that surpasses.And 53% buried depth of coal resources in China total amount is greater than 1000m, due to the high-ground stress of deep production, press and large rheological behavior of surrounding rocks on HI high impact ground, has brought serious difficulty to the roadway bolt supporting.
Current domestic anchor pole, what generally adopt is the reinforcing bar of hot rolling HRB335 and HRB400 level, HRB500, HRB600 grade reinforcing steel.These anchor pole characteristics are that HRB335 and HRB400 level room temperature ballistic work are higher, and unit elongation is also higher, but intensity is too low, the higher but room temperature ballistic work AKV of HRB600 grade reinforcing steel intensity
2it is only the 30-40 joule.These its performances of intensity level anchor pole can't meet current mining development needs.
Roadway Support Technology is a gordian technique in coal mining projects.The wall rock condition of coal mine roadway is Protean, along with mining depth strengthens, geologic condition can be more complicated and severe, pressure ratio is large and coal body is more broken, it is a principal element that affects roadway support quality and effect, adopting which kind of support pattern just can guarantee the safe handling in tunnel and the safe back production of later stage work face, is the numerous engineering technical personnel's of puzzlement a large technical barrier.
Along with mining depth increases, mining intensity increases, and some coal production geologic conditions are severe gradually, and roadway support is also more and more difficult.The appearance in creep country rock tunnel, five positive colliery fender dynamic pressure digging laneways, remaining my coal industry breaking surrounding rock tunnel etc. is pressed on the highland, colliery, ,Chang village, tunnel that affected by strong dynamic pressure such as the Zhang Cun colliery, and intensity, impelling strength and the unit elongation of bolt supporting material had to further requirement.For existing because the reasons such as anchor rod strength is not enough, impelling strength is not enough cause the problem that the disrumpent feelings roadway support of anchor pole was lost efficacy in the complicated difficult roadway support in each ore deposit, need badly and find a kind of novel high strength, the reinforced anchor rod of high impact toughness meets the roadway support under complicated special conditions.Anchor rod strength and preliminary tension require all higher, in order to guarantee that the strength and stiffness of support system can meet field demand.
High strength, high impact toughness and the high-elongation of our up-to-date research and development anchor pole--ballistic work is greater than 100 joules of superstrength anchor poles can solve the difficult problem of roadway support under complicated hard situation.This novel anchor rod is that regular reinforcement obtains through special thermal treatment, there is processing simple, the over-all propertieies such as intensity, impelling strength and unit elongation are better than having at present the advantage of model anchor pole, can also apply higher prestress, improve supporting intensity, control a roadway support difficult problem under complicated hard situation, to guarantee mine safety production.
Summary of the invention: the purpose of this invention is to provide a kind of body of rod performance room temperature ballistic work AKV
2value is more than 100 joules, and between yield strength 600-830MPa, more than elongation after fracture A19%, the anchor pole more than maximum, force breaking elongation Agt9% is to meet roadway support difficult problem requirement under complicated hard situation.
For realizing this purpose, the invention provides following scheme: the hot rolled ferrite of take adds the perlite reinforcing bar as raw material, in raw material, contain silicon, the 0.5-1.5% of carbon, the 0.3-1.0% of 0.1-0.5% manganese, be no more than 0.035% sulphur, phosphorus, by purposes, need to add in right amount the elements such as vanadium, titanium, niobium, all the other compositions are iron; Profile can be the light circle, without vertical rib Rib Reinforced spiral (left-handed or dextrorotation), the vertical rib screw thread rib spiral (left-handed or dextrorotation) of nothing, carries out continuous special thermal treatment by purposes.
Special thermal treatment comprises that continuous induction heating production line quenches, and tempering.Quenching and tempering are heated and are adopted intermediate frequency to add ultrasonic frequency induction heating processing mode.This process comprises: Heating temperature is no more than 850 ℃, is incubated 2-3 second, quenches, and 160 ± 10 ℃ are incubated 6-12 second, and tempering temperature is no more than 550 ℃, is chilled to room temperature.In this process, carbon is diffused into residual austenite from oversaturated martensite separating out of carbon does not occur, the austenite that makes rich carbon keeps stable and martensitic transformation does not occur in the process of cool to room temperature subsequently, to reach the purpose of reinforcing bar superhigh tenacity and elongation.
The finished product nominal diameter is the 16-40 millimeter, and length is 2-12 rice, room temperature impact absorbing energy AKV
2>=100J, yield strength class 6 00-830MPa, A>=19%, Agt>=9%, surperficial flawless.
Advantage of the present invention is the high-strength high ductility HI high impact of the body of rod, room temperature ballistic work AKV
2value, more than 100 joules, is that current existing traditional anchor pole can't be compared, the fine high-ground stress that solved, HI high impact ground press and large moments such as rheological behavior of surrounding rocks the brute force moving load the destruction serious difficult problem that supporting brings to roadway bolt.
Embodiment: below in conjunction with case introduction the specific embodiment of the present invention:
Example 1
Select a kind of 335MPa level, diameter 20mm hot rolled ferrite adds perlite reinforcing bar carbon containing 0.20%, manganese 1.35%, and silicon 0.48%, sulphur 0.025%, phosphorus 0.022%, all the other are iron and trace impurity.In continuously uninterrupted formula intermediate frequency adds the ultrasonic frequency induction heater, heat, 845 ℃ of temperature, be incubated 3 seconds, cold quenching, and 160 ℃ of insulations 10 seconds, 400 ℃ of tempering temperatures, water-cooled, to room temperature, is cut into required rock-bolt length.
This reinforcing bar after above production technique thermal treatment, room temperature ballistic work AKV
2value is 151 joules, yield strength is that 643Mpa, tensile strength Rm value are 835Mpa, and elongation after fracture A value reaches 23.5%, and maximum, force breaking elongation Agt value reaches 12.5%, be organized as retained austenite, ferrite adds multiple tissue (seeing Fig. 1) of tempering martensite.
Example 2
Select a kind of 335MPa level, diameter 26mm hot rolled ferrite adds perlite reinforcing bar carbon containing 0.25%, manganese 1.40%, and silicon 0.46%, sulphur 0.033%, phosphorus 0.026%, all the other are iron and impurity for vanadium 0.04%.In continuously uninterrupted formula intermediate frequency adds the ultrasonic frequency induction heater, heat, 840 ℃ of temperature, be incubated 3 seconds, cold quenching, and 162 ℃ of insulations 10 seconds, 450 ℃ of tempering temperatures, water-cooled, to room temperature, is cut into required rock-bolt length.
This reinforcing bar after above production technique thermal treatment, room temperature ballistic work AKV
2value is 122 joules, and yield strength is that 720Mpa, tensile strength Rm value are 957Mpa, and elongation after fracture A value reaches 22.0%, and maximum, force breaking elongation Agt value reaches 11%, is organized as ferrite, retained austenite and adds martensitic multiple tissue (seeing Fig. 2).
Example 3
Select a kind of 335MPa level, diameter 22mm hot rolled ferrite adds perlite reinforcing bar carbon containing 0.22%, manganese 1.45%, silicon 0.46%, sulphur 0.013%, phosphorus 0.020%, vanadium 0.080%.Add in the ultrasonic frequency induction heater and heat at the continous way intermediate frequency, 840 ℃ of temperature, be incubated 3 seconds, cold quenching, and 160 ℃ are incubated 10 seconds, 500 ℃ of tempering temperatures, water-cooled, to room temperature, is cut into required rock-bolt length.
This reinforcing bar after above production technique thermal treatment, room temperature ballistic work AKV
2value is 102 joules, yield strength is that 830Mpa, tensile strength Rm value are 1050Mpa, elongation after fracture A value reaches 19.0%, and maximum, force breaking elongation Agt value reaches 10%, is organized as ferrite, retained austenite and adds martensitic multiple tissue (seeing Fig. 3).
The accompanying drawing explanation: Fig. 1 is reinforcing bar micro-organization chart.
Fig. 2 is reinforcing bar micro-organization chart.
Fig. 3 is reinforcing bar micro-organization chart.
Claims (4)
1. a ballistic work is greater than the production technique of the superstrength anchor pole of 100 joules, it is characterized in that, described processing step is as follows:
(1) select a kind of 335MPa level, diameter 20mm hot rolled ferrite adds the perlite reinforcing bar as raw material, wherein said reinforcing bar carbon containing 0.20%, and manganese 1.35%, silicon 0.48%, sulphur 0.025%, phosphorus 0.022%, all the other are iron and trace impurity;
(2) in continuously uninterrupted formula intermediate frequency adds the ultrasonic frequency induction heater, heat, 845 ℃ of temperature, be incubated 3 seconds, cold quenching, and 160 ℃ of insulations 10 seconds, 400 ℃ of tempering temperatures, water-cooled, to room temperature, is cut into required rock-bolt length;
Wherein, described reinforcing bar after above production technique thermal treatment, room temperature ballistic work A
kV2value is 151 joules, and yield strength is that 643MPa, tensile strength Rm value are 835MPa, and elongation after fracture A value reaches 23.5%, maximum, force breaking elongation A
gtvalue reaches 12.5%, is organized as retained austenite, and ferrite adds tempering martensite heterogeneous structure.
2. a ballistic work is greater than the production technique of the superstrength anchor pole of 100 joules, it is characterized in that, described processing step is as follows:
(1) select a kind of 335MPa level, diameter 26mm hot rolled ferrite adds the perlite reinforcing bar as raw material, wherein said reinforcing bar carbon containing 0.25%, and manganese 1.40%, silicon 0.46%, sulphur 0.033%, phosphorus 0.026%, vanadium 0.04%, all the other are iron and impurity;
(2) in continuously uninterrupted formula intermediate frequency adds the ultrasonic frequency induction heater, heat, 840 ℃ of temperature, be incubated 3 seconds, cold quenching, and 162 ℃ of insulations 10 seconds, 450 ℃ of tempering temperatures, water-cooled, to room temperature, is cut into required rock-bolt length;
Wherein, described reinforcing bar after above production technique thermal treatment, room temperature ballistic work A
kV2value is 122 joules, and yield strength is that 720MPa, tensile strength Rm value are 957MPa, and elongation after fracture A value reaches 22.0%, maximum, force breaking elongation A
gtvalue reaches 11%, is organized as ferrite, retained austenite adds martensitic heterogeneous structure.
3. a ballistic work is greater than the production technique of the superstrength anchor pole of 100 joules, it is characterized in that, described processing step is as follows:
(1) select a kind of 335MPa level, diameter 22mm hot rolled ferrite adds the perlite reinforcing bar as raw material, wherein said reinforcing bar carbon containing 0.22%, manganese 1.45%, silicon 0.46%, sulphur 0.013%, phosphorus 0.020%, vanadium 0.080%;
(2) add in the ultrasonic frequency induction heater and heat at the continous way intermediate frequency, 840 ℃ of temperature, be incubated 3 seconds, cold quenching, and 160 ℃ are incubated 10 seconds, 500 ℃ of tempering temperatures, water-cooled, to room temperature, is cut into required rock-bolt length;
Wherein, described reinforcing bar after above production technique thermal treatment, room temperature ballistic work A
kV2value is 102 joules, and yield strength is that 830MPa, tensile strength Rm value are 1050MPa, and elongation after fracture A value reaches 19.0%, maximum, force breaking elongation A
gtvalue reaches 10%, is organized as ferrite, retained austenite adds martensitic heterogeneous structure.
4. according to the described production technique of claim 1-3 any one, it is characterized in that: reinforcing bar is realized on the continuous heat treatment production line be quenched to from austenitic area martensitic transformation and started the some temperature between temperature and finishing temperature, and suitably be incubated in this temperature, make carbon be diffused in residual austenite and go from oversaturated martensite, guarantee in this diffusion process simultaneously, separating out of carbon do not occur, thereby the retained austenite that makes rich carbon keeps stable and martensitic transformation does not occur in the process of cool to room temperature subsequently, increase this carbon diffusion process between quenching and tempering process, reach the purpose that improves reinforcing bar toughness and elongation.
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| CN104109803B (en) * | 2013-04-27 | 2016-12-28 | 宝鼎科技股份有限公司 | Height low-temperature high-toughness of quenching returns tower single-casting material and manufacture method |
| 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 |
| CN111396103B (en) * | 2020-03-05 | 2022-04-01 | 首钢长治钢铁有限公司 | Continuous rib anchor rod steel and preparation method thereof |
| CN112195395B (en) * | 2020-09-01 | 2021-10-26 | 陕钢集团产业创新研究院有限公司 | MG 500-grade anchor rod steel with yield ratio less than or equal to 0.8 and production method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101613828A (en) * | 2009-07-16 | 2009-12-30 | 首钢总公司 | Super-thick steel plate for low yield ratio buildings with 460 MPa grade yield strength and manufacture method |
| CN102352462A (en) * | 2011-09-28 | 2012-02-15 | 中国钢研科技集团有限公司 | Anchor rod rebar with high strength and high impact toughness and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101613828A (en) * | 2009-07-16 | 2009-12-30 | 首钢总公司 | Super-thick steel plate for low yield ratio buildings with 460 MPa grade yield strength and manufacture method |
| CN102352462A (en) * | 2011-09-28 | 2012-02-15 | 中国钢研科技集团有限公司 | Anchor rod rebar with high strength and high impact toughness and preparation method thereof |
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Inventor after: Feng Dibao Inventor after: Kang Hongpu Inventor after: Ding Ji Inventor after: Zhou Guangping Inventor after: Fu Guangqing Inventor after: Yue Hongxian Inventor after: Dong Benling Inventor after: Lin Jian Inventor after: Wu Yongzheng Inventor before: Feng Dibao Inventor before: Ding Ji Inventor before: Zhou Guangping Inventor before: Fu Guangqing Inventor before: Yue Hongxian Inventor before: Dong Benling Inventor before: Wu Yongzheng |
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Inventor after: Feng Dibao Inventor after: Fan Meiguang Inventor after: Sun Benrong Inventor after: Zhao Lianhe Inventor after: Hu Kening Inventor after: Kang Hongpu Inventor after: Ding Ji Inventor after: Zhou Guangping Inventor after: Fu Guangqing Inventor after: Yue Hongxian Inventor after: Dong Benling Inventor after: Lin Jian Inventor after: Wu Yongzheng Inventor before: Feng Dibao Inventor before: Kang Hongpu Inventor before: Ding Ji Inventor before: Zhou Guangping Inventor before: Fu Guangqing Inventor before: Yue Hongxian Inventor before: Dong Benling Inventor before: Lin Jian Inventor before: Wu Yongzheng |
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Effective date of registration: 20160107 Address after: 455000 North Meng Industrial Zone, Yindu District, Henan, Anyang Patentee after: Anyang Longteng Special Steel Manufacturing Co., Ltd. Patentee after: Fan Meiguang Patentee after: Sun Benrong Patentee after: Zhou Guangping Address before: 455000 North Meng Industrial Zone, Yindu District, Henan, Anyang Patentee before: Anyang Longteng Special Steel Manufacturing Co., Ltd. |