CN102864376B - High-strength full-thread equal-strong resin bolting reinforcing bar and production method thereof - Google Patents
High-strength full-thread equal-strong resin bolting reinforcing bar and production method thereof Download PDFInfo
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Abstract
The invention provides a high-strength full-thread equal-strong resin bolting reinforcing bar and a production method thereof. The high-strength full-thread equal-strong resin bolting reinforcing bar comprises the following chemical components: 0.18-0.27wt% of C, 0.30-0.75wt% of Si, 1.35-1.60wt% of Mn, 0.06-0.09wt% of V, less than or equal to 0.035wt% of P, less than or equal to 0.035wt% of S and the balance of Fe and inevitable impurities. During a smelting process, a vanadium nitrogen alloy is micro-alloyed, so as to increase the strength and toughness of the reinforcing bar. Due to the high strength of the high-strength full-thread equal-strong resin bolting reinforcing bar according to the invention, the steel material can be saved, the shoring cost is lowered, the structure strength is enhanced and the safety storage is increased.
Description
Technical field
The invention belongs to microalloying roadway support and use rings territory, specifically, the present invention relates to the strong resin anchor reinforcing bar such as a kind of anchor pole reinforcing bar and production method thereof, particularly a kind of v n micro alloying perfect thread and production method thereof.
Background technology
BOLTING TECHNOLOGY TO COAL ROADWAY development in recent years is very rapid.Hot rolling resin anchor reinforcing bar is mainly used in the bolt supporting in colliery hoistway and tunnel, and bolt supporting is an important support technology of widespread use.This support system is improving supporting effect of roadway, guarantee tunnel safety, alleviate labor strength, simplify the aspects such as coal-face termination district service procedure and there is obvious superiority, extremely be conducive to the quick propelling of coal-face, realize the high-yield and high-efficiency of mine.
Along with the continuous exploitation of coal resources, the mining depth of mine constantly increases, and at present the seam mining depth-averaged of China's coal-mine increases 9m every year, and adopting the mine that is deeply greater than 700m has 50 many places, and 53% buried depth of coal resources in China total amount is greater than 1000m.Due to the high terrestrial stress that deep production brings, high rock burst and large rheological behavior of surrounding rocks, caused serious difficulty to the bolt supporting of coal road.At present, the hot rolling resin anchor reinforced steel bar strength that is applied to colliery roadway and tunnel support mostly is 335MPa, 400MPa level common bolt, but they can not meet the needs of bolt support technology development.Can predict, the demand of high strength, high precision, high bearing capacity, body of rod total length equal strength anchor rod is by increasing.
Therefore, need strong resin anchor reinforcing bar and the production methods thereof such as development research high strength perfect thread badly.
Summary of the invention
The present invention aims to provide strong resin anchor reinforcing bar and the production technique thereof such as a kind of high strength perfect thread, the strong resin anchor reinforcing bar such as high strength perfect thread of the present invention comprises the body of rod and is positioned at the contour spiral cross rib of two portions up and down on the excircle of the described body of rod, wherein, by the contour spiral cross rib of described upper and lower two portions, on same spiral-line, form screw thread, can be directly and the cast steel nut of dimension be used in conjunction with, do not need secondary dog, rolled thread processing binding thread, and the two sides of the strong resin anchor reinforcing bar such as described high strength perfect thread does not comprise vertical rib.In addition, high according to the lever strength of the strong resin anchor reinforcing bars such as high strength perfect thread of the present invention, can greatly reduce coal mine roadway bolt supporting density and improve security, can reduce the consumption of metal, be a kind of joint material, saving of labor, equicohesive novel anchor rod, can adapt to the requirement of the current coal mine support safety of China, energy-saving and environmental protection.
In order to realize one object of the present invention, the production method of the strong resin anchor reinforcing bars such as a kind of high strength perfect thread is provided, described production method comprises converter smelting, ladle argon-blown, continuous casting, rolling process, it is characterized in that, in described converter smelting operation, adopt VN alloy to carry out microalloying, and by the Composition Control of molten steel be: C:0.18～0.27wt%; Si:0.30～0.75wt%; Mn:1.35～1.60wt%; V:0.06～0.09wt%; P≤0.035wt%; S≤0.035wt%; All the other are Fe and inevitable impurity.
According to the present invention, in described converter smelting operation, at silicomanganese, ferro-silicon, add the later stage that VN alloy is added to ladle steel stream impact zone with steel stream.
According to the present invention, in described converter smelting operation, smelting process adopts high drawing to re-blow, and controls terminal [C] >=0.10wt%.Adopting barium is deoxidation, and barium is that add-on is 1.0-1.5kg/t
steel, and aim at steel stream and evenly add barium deoxidier putting steel process.
According to the present invention, in described Argon operation, after the composition temperature of molten steel is suitable, carry out soft blow operation, soft blow time >=8min.
According to the present invention, in described continuous casting working procedure, controlling tundish temperature is 1515 ℃～1530 ℃, and pulling rate is 2.4m/min～3.0m/min.
According to the present invention, in described rolling process, process parameter control is: Heating temperature is 1160～1220 ℃, and start rolling temperature is 1080～1150 ℃, and finishing temperature is 950～1040 ℃, and then air cooling is to room temperature.
According to the present invention, the yield strength σ of the strong resin anchor reinforcing bar such as described high strength perfect thread
s>=500MPa, tensile strength sigma
b>=640MPa, unit elongation δ
5>=18%.
According to the present invention, described barium is at least one in Si-Ca-Ba and Si-Al-Ba-Ca.
According to the present invention, in described converter smelting operation, by the Composition Control of molten steel, be: C0.19～0.25wt%; Si 0.35～0.60wt%; Mn 1.35～1.55wt%; V 0.06～0.08wt%; P≤0.035wt%; S≤0.035wt%; All the other are Fe and inevitable impurity.
In order to realize another object of the present invention, the strong resin anchor reinforcing bars such as a kind of high strength perfect thread are provided, the chemical composition of described anchor pole reinforcing bar is: C:0.18～0.27wt%; Si:0.30～0.75wt%; Mn:1.35～1.60wt%; V:0.06～0.09wt%; P≤0.035wt%; S≤0.035wt%; All the other are Fe and inevitable impurity.
According to the present invention, the properties of the strong resin anchor reinforcing bar such as high strength perfect thread meets yield strength σ
s>=500MPa, tensile strength sigma
b>=640MPa, unit elongation δ
5>=18%.
According to the present invention, the chemical composition of the strong resin anchor reinforcing bar such as high strength perfect thread can be: C0.19～0.25wt%; Si 0.35～0.60wt%; Mn 1.35～1.55wt%; V 0.06～0.08wt%; P≤0.035wt%; S≤0.035wt%; All the other are Fe and inevitable impurity.
Therefore, the strong resin anchor reinforcing bar such as high strength perfect thread provided by the invention, in smelting process, adopt VN alloy microalloying, with vanadium fixed nitrogen, with nitrogen, optimize separating out of vanadium, give full play to the two in conjunction with the strengthening effect producing, improve intensity and the toughness of reinforcing bar.According to the high strength of anchor pole reinforcing bar of the present invention, can save steel, reduce support cost, increase structural strength, strengthen safety reservation.
Embodiment
The present invention aims to provide strong resin anchor reinforcing bar and the production methods thereof such as a kind of high strength perfect thread, to adapt to the requirement of current coal mine support safety, energy-saving and environmental protection.
Specifically, according to the strong resin anchor reinforcing bar such as high strength perfect thread of the present invention, comprise the body of rod and be positioned at the contour spiral cross rib of two portions up and down on the excircle of the described body of rod, wherein, by the contour spiral cross rib of described upper and lower two portions, on same spiral-line, form screw thread, can be directly and the cast steel nut of dimension be used in conjunction with, do not need secondary dog rolled thread processing binding thread, and the two sides of the strong resin anchor reinforcing bar such as described high strength perfect thread does not comprise vertical rib.Therefore, high according to the lever strength of the strong resin anchor reinforcing bars such as high strength perfect thread of the present invention, can greatly reduce coal mine roadway bolt supporting density and improve security, can reduce the consumption of metal, be a kind of joint material, saving of labor, equicohesive novel anchor rod, can adapt to the requirement of the current coal mine support safety of China, energy-saving and environmental protection.
According to the present invention, the chemical composition of the strong resin anchor reinforcing bar such as high strength perfect thread is: C0.18～0.27wt%; Si 0.30～0.75wt%; Mn 1.35～1.60wt%; V 0.06～0.09wt%; P≤0.035wt%; S≤0.035wt%, surplus is Fe and inevitable impurity.Preferably, according to the chemical composition of the strong resin anchor reinforcing bars such as high strength perfect thread of the present invention, be: C 0.19～0.25wt%; Si0.35～0.60wt%; Mn 1.35～1.55wt%; V 0.06～0.08wt%; P≤0.035wt%; S≤0.035wt%; Surplus is Fe and inevitable impurity.
In the present invention, except steel-making common elements C, Si, Mn, adopt VN alloy microalloying.Vanadium (V) very easily forms V (CN) compound with C, N in steel, play the effect of precipitation hardening, can effectively improve the comprehensive mechanical performances such as intensity, toughness, ductility and the thermal fatigue resistance of steel, reaching under same intensity, add vanadium nitride and can save vanadium add-on 30-40%, and then reduced cost.According to the properties of the strong resin anchor reinforcing bars such as high strength perfect thread of the present invention, meet yield strength σ
s>=500MPa, tensile strength sigma
b>=640MPa, unit elongation δ
5>=18%.
To describe in detail according to the production method of the strong resin anchor reinforcing bars such as high strength perfect thread of the present invention below.According to the production method of the strong resin anchor reinforcing bars such as high strength perfect thread of the present invention, comprise converter smelting operation, ladle argon-blown operation, continuous casting working procedure and rolling process.
Specifically, according to the present invention, in converter smelting operation, at silicomanganese, ferro-silicon, add the later stage that VN alloy is added to ladle steel stream impact zone with steel stream, rely on the shock action of steel stream fully to mix, make alloy homogenizing.Preferably, in converter smelting operation, smelting process adopts high drawing to re-blow, and controls terminal [C] >=0.10wt%, reduces Molten Steel over-oxidation as far as possible.Adopting barium is deoxidation, and barium is that add-on is 1.0～1.5kg/t
steel, and aim at steel stream and evenly add barium deoxidier putting steel process.Barium system can be Si-Ca-Ba and/or Si-Al-Ba-Ca.In the present invention, take VN alloy microalloying, with vanadium fixed nitrogen, with nitrogen, optimize separating out of vanadium, give full play to the two in conjunction with the strengthening effect producing, thereby improve intensity and the toughness of reinforcing bar.
According to the present invention, in ladle argon-blown operation, after the composition temperature of molten steel is suitable, carry out soft blow operation, control soft blow time 8～10min, so that immature inclusion floats fully and removes in steel, improve molten steel cleanness.
According to the present invention, in continuous casting working procedure, controlling tundish temperature is 1515 ℃～1530 ℃, and pulling rate is 2.4m/min～3.0m/min.
According to the present invention, in rolling process, by process parameter control, be: Heating temperature is 1160 ℃～1220 ℃, start rolling temperature is 1080 ℃～1150 ℃, and finishing temperature is 950 ℃～1040 ℃, and then air cooling is to room temperature, thereby obtains anchor pole reinforcing bar of the present invention.
According to one embodiment of present invention, can become by converter smelting, ladle argon-blown, continuous casting the square billet of 150mm × 150mm or 160mm × 160mm, by continuous rod mill rolling, become a useful person, the specification of becoming a useful person is Ф 16mm～Ф 22mm, and the reinforcing bar after moulding has following chemical composition: C:0.18～0.27wt%; Si:0.30～0.75wt%; Mn:1.35～1.60wt%; V:0.06～0.09wt%; P≤0.035wt%; S≤0.035wt%; All the other are Fe and inevitable impurity.The properties of the strong resin anchor reinforcing bar such as above-mentioned high strength perfect thread meets yield strength σ
s>=500MPa, tensile strength sigma
b>=640MPa, unit elongation δ
5>=18%.
Further illustrate below in conjunction with specific embodiments the present invention.Following examples are only for setting forth the present invention, but protection scope of the present invention is not limited to following examples.
Embodiment 1
The chemical composition of controlling molten steel is: the P of V, the 0.025wt% of Mn, the 0.068wt% of the C of 0.21wt%, the Si of 0.40wt%, 1.44wt%, the S of 0.021wt%, all the other are Fe and inevitable impurity.
The technological process of production is: converter smelting, ladle argon-blown, continuous casting, rolling process, wherein, in described converter smelting operation, adopt VN alloy to carry out microalloying, smelting process adopts high drawing to re-blow, controlling terminal [C] is 0.14wt%, adopt Si-Ca-Ba deoxidation, wherein, the add-on of Si-Ca-Ba is 1.05kg/t
steel, to aim at steel stream and evenly add putting steel process, VN alloy adds the later stage to add ladle steel stream impact zone with steel stream at silicomanganese, ferro-silicon; In ladle argon-blown process, after the composition temperature of molten steel is suitable, carry out soft blow operation, argon blowing time is 9.5min; In casting process, controlling tundish temperature mean value is 1518 ℃, and average pull rate is 2.5m/min; In the operation of rolling, controlling Heating temperature is 1200 ℃, and start rolling temperature is 1120 ℃, and finishing temperature is 980 ℃, and then air cooling is to room temperature.The specific performance parameter of gained reinforcing bar is shown in table 1 below.
Embodiment 2
The chemical composition of controlling molten steel is: the P of V, the 0.021wt% of Mn, the 0.070wt% of the C of 0.19wt%, the Si of 0.37wt%, 1.40wt%, the S of 0.014wt%, all the other are Fe and inevitable impurity.
The technological process of production is: converter smelting, ladle argon-blown, continuous casting, rolling process, wherein, in described converter smelting operation, adopt VN alloy to carry out microalloying, smelting process adopts high drawing to re-blow, controlling terminal [C] is 0.12wt%, adopt Si-Al-Ba-Ca deoxidation, the add-on of Si-Al-Ba-Ca is 1.40kg/t
steel, to aim at steel stream and evenly add putting steel process, VN alloy adds the later stage to add ladle steel stream impact zone with steel stream at silicomanganese, ferro-silicon; In ladle argon-blown process, after the composition temperature of molten steel is suitable, carry out " soft blow " operation, argon blowing time is 8.5min; At casting process control tundish temperature mean value, be 1523 ℃, average pull rate is 2.7m/min; The processing parameter of described rolling process is as follows, and Heating temperature is 1180 ℃, and start rolling temperature is 1100 ℃, and finishing temperature is 975 ℃, and then air cooling is to room temperature.The specific performance parameter of gained reinforcing bar is shown in table 1 below.
Embodiment 3
The chemical composition of controlling molten steel is: the P of V, the 0.017wt% of Mn, the 0.066wt% of the C of 0.23wt%, the Si of 0.52wt%, 1.45wt%, the S of 0.023wt%, all the other are Fe and inevitable impurity.
The technological process of production is: converter smelting, ladle argon-blown, continuous casting, rolling process, wherein, in described converter smelting operation, adopt VN alloy to carry out microalloying, smelting process adopts high drawing to re-blow, controlling terminal [C] is 0.14wt%, adopt the mixture deoxidation of Si-Ca-Ba and Si-Al-Ba-Ca, wherein, the add-on of described mixture is 1.20kg/t
steel, to aim at steel stream and evenly add putting steel process, VN alloy adds the later stage to add ladle steel stream impact zone with steel stream at silicomanganese, ferro-silicon; In ladle argon-blown process, after the composition temperature of molten steel is suitable, carry out soft blow operation, argon blowing time is 8min; At casting process control tundish temperature mean value, be 1526 ℃, average pull rate is 2.9m/min; The processing parameter of described rolling process is as follows, and Heating temperature is 1210 ℃, and start rolling temperature is 1130 ℃, and finishing temperature is 1000 ℃, and then air cooling is to room temperature.The specific performance parameter of gained reinforcing bar is shown in table 1 below.
Embodiment 4
The chemical composition of controlling molten steel is: the P of V, the 0.025wt% of Mn, the 0.075wt% of the C of 0.25wt%, the Si of 0.45wt%, 1.50wt%, the S of 0.02wt%, all the other are Fe and inevitable impurity.
The technological process of production is: converter smelting, ladle argon-blown, continuous casting, rolling process, wherein, in described converter smelting operation, adopt VN alloy to carry out microalloying, smelting process adopts high drawing to re-blow, controlling terminal [C] is 0.13wt%, adopt Si-Ca-Ba deoxidation, wherein, the add-on of Si-Ca-Ba is 1.15kg/t
steel, to aim at steel stream and evenly add putting steel process, VN alloy adds the later stage to add ladle steel stream impact zone with steel stream at silicomanganese, ferro-silicon; In ladle argon-blown process, after the composition temperature of molten steel is suitable, carry out " soft blow " operation, argon blowing time is 9min; At casting process control tundish temperature mean value, be 1520 ℃, average pull rate is 2.6m/min; The processing parameter of described rolling process is as follows, and Heating temperature is 1175 ℃, and start rolling temperature is 1090 ℃, and finishing temperature is 970 ℃, and then air cooling is to room temperature.The specific performance parameter of gained reinforcing bar is shown in table 1 below.
The performance perameter of the each embodiment gained of table 1 reinforcing bar
| Embodiment | Specification | σ s/MPa | σ b/MPa | δ 5/％ |
| 1 | Ф20 | 550 | 695 | 24 |
| 2 | Ф16 | 545 | 685 | 25.5 |
| 3 | Ф18 | 570 | 725 | 26 |
| 4 | Ф22 | 565 | 715 | 23 |
The strong resin anchor reinforcing bar such as the perfect thread of producing according to employing VN alloy microalloying technique of the present invention comprises the body of rod and is positioned at the contour spiral cross rib of two portions up and down on the excircle of the described body of rod, by the contour spiral cross rib of upper and lower two portions, on same spiral-line, forms screw thread.Therefore, compared with traditional thread steel type resin anchor reinforcing bar, according to strong resin anchor reinforcing bars such as perfect threads of the present invention, can be directly and the cast steel nut of dimension be used in conjunction with.After hot-rolled finished product does not need secondary dog, binding thread is processed in rolled thread, and cast steel nut direct and dimension is used in conjunction with, and has reduced user's cost of use; Body of rod total length equal strength, anchor force is large, without plane of weakness, than the supporting capacity of same specification common bolt, improves 40%; Can intercept arbitrarily easily as required the different lengths body of rod, and can meet end anchor, lengthening anchor and full length fastening form needs, material use efficiency is high, reduces the consumption of metallic substance.
High according to the intensity of the strong resin anchor reinforcing bars such as high strength perfect thread of the present invention, precision is high, supporting capacity is high, thereby can greatly reduce coal mine roadway bolt supporting density, raising security, reduction labor strength, raising operating rate.Therefore, according to strong resin anchor reinforcing bars such as high strength perfect threads of the present invention, be a kind of joint material, saving of labor, equicohesive novel anchor rod, adapt to the requirement of the current coal mine support safety of China, energy-saving and environmental protection.
The invention is not restricted to above-described embodiment, without departing from the spirit and scope of the present invention, can carry out various variants and modifications to embodiments of the invention.
Claims (3)
1. a production method for the strong resin anchor reinforcing bar such as high strength perfect thread, described method comprises:
Converter smelting operation, smelting process adopts high drawing to re-blow, and controls terminal [C]>=0.10wt%, and adopting barium is deoxidation, and barium is that add-on is 1.0-1.5kg/t
steeland aim at steel stream and evenly add barium deoxidier putting steel process, at silicomanganese, ferro-silicon, add the later stage with steel stream, to add ladle steel stream impact zone to carry out deoxidation microalloying to the molten steel in ladle VN alloy, and by the Composition Control of molten steel be: C0.18～0.27wt%; Si0.30～0.75wt%; Mn1.35～1.60wt%; V0.06～0.09wt%; P≤0.035wt%; S≤0.035wt%; All the other are Fe and inevitable impurity;
Ladle argon-blown operation, after the composition temperature of molten steel is suitable, carries out soft blow operation, soft blow time >=8min;
Continuous casting working procedure, controlling tundish temperature is 1515 ℃～1530 ℃, pulling rate is 2.4m/min～3.0m/min;
Rolling process, process parameter control is: Heating temperature is 1160～1220 ℃, and start rolling temperature is 1080～1150 ℃, and finishing temperature is 950～1040 ℃, and then air cooling is to room temperature.
2. production method according to claim 1, is characterized in that, the yield strength σ of the strong resin anchor reinforcing bar such as described high strength perfect thread
s>=500MPa, tensile strength sigma
b>=640MPa, unit elongation δ
5>=18%.
3. production method according to claim 1, is characterized in that, described barium is at least one in Si-Ca-Ba and Si-Al-Ba-Ca.
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| CN103388064A (en) * | 2013-08-19 | 2013-11-13 | 梧州市永达钢铁有限公司 | Manufacturing method for high-strength steel bar |
| CN103397281A (en) * | 2013-08-19 | 2013-11-20 | 梧州市永达钢铁有限公司 | High-strength steel and preparation method thereof |
| CN103667871B (en) * | 2013-11-12 | 2015-11-11 | 山东西王特钢有限公司 | Exempt from mantle fiber Deformed Steel Bars complete processing |
| CN104451443B (en) * | 2014-11-21 | 2017-04-26 | 芜湖新兴铸管有限责任公司 | Anchor rod steel for coal mines and production method thereof |
| CN104480388A (en) * | 2014-12-13 | 2015-04-01 | 广西科技大学 | Novel formula of semi-grouting type high-strength thick reinforcing bar |
| CN104532162A (en) * | 2014-12-13 | 2015-04-22 | 广西科技大学 | Formula of high-strength steel bar |
| CN104480410A (en) * | 2014-12-13 | 2015-04-01 | 广西科技大学 | Formula of half grouting type high-strength thick reinforcing bar |
| CN104928572A (en) * | 2015-05-27 | 2015-09-23 | 河北钢铁股份有限公司承德分公司 | Twisted steel with diameter of being 60mm and production method |
| CN105200315B (en) * | 2015-09-24 | 2017-04-05 | 武汉钢铁(集团)公司 | A kind of production method of anchor bar 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 |
| CN106399855B (en) * | 2016-09-19 | 2018-09-25 | 石横特钢集团有限公司 | HRB500E Ribbed Bars bar and its production technology |
| CA3072732C (en) * | 2017-09-15 | 2022-01-11 | Rand York Castings (Pty) Limited | A rock bolt |
| CN109439854B (en) * | 2018-11-08 | 2020-10-20 | 国家能源投资集团有限责任公司 | 1000 MPa-grade ultrahigh-strength corrosion-resistant high-elongation anchor rod steel and production method thereof |
| CN111996466B (en) * | 2020-09-18 | 2021-09-17 | 莱芜钢铁集团银山型钢有限公司 | V-N microalloyed steel and production method of V-N microalloyed continuous casting billet without surface cracks |
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