CN104451443A - Anchor rod steel for coal mines and production method thereof - Google Patents
Anchor rod steel for coal mines and production method thereof Download PDFInfo
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- CN104451443A CN104451443A CN201410675945.3A CN201410675945A CN104451443A CN 104451443 A CN104451443 A CN 104451443A CN 201410675945 A CN201410675945 A CN 201410675945A CN 104451443 A CN104451443 A CN 104451443A
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Abstract
The invention provides anchor rod steel for coal mines. The anchor rod steel is composed of the following elements according to mass percent: 0.20-0.25% of C, 0.85-1.55% of Mn, 0.40-0.70% of Si, 0.025-0.095% of V, not larger than 0.040% of P, not larger than 0.040% of S, not larger than 0.10% of Cr, not larger than 0.10% of Ni, not larger than 0.15% of Cu and the balance of Fe and impurity elements. The invention further provides a production method of the anchor rod steel for coal mines. The production method adopts a technological process of converter refining, vanadium in steel micro-alloying, full protection casting, billet checking, heating in a heating furnace, continuous rolling and rapid cooling after rolling, a refining procedure is omitted, thereby not only simplifying the procedures, but also saving the energy resources, and the anchor rod steel produced by the method provided by the invention is characterized in that the yield strength is not smaller than 400 MPa, the tensile strength is smaller than 585 MPa and the stretch rate is not smaller than 18%.
Description
Technical field
The invention belongs to metallurgy industry, more particularly relate to a kind of colliery anchor bar steel and production method thereof.
Background technology
China's coal-mine roadway support experienced by wooden support, builds arch supporting, shaped steel supporting, in recent years, due to coal pit mining require day by day complicated, down-hole supporting becomes more and more difficult, also more and more higher to the requirement of support material, colliery is low in the urgent need to price, quality good, safety performance reliable down-hole support material, the preferred manner of bolt supporting colliery tunnel support just, have that cost is low, supporting effect good, easy and simple to handle, use flexibly, take the advantages such as construction headroom is few.Current anchor pole metallic rod body is through rolled thread, mix pallet, nut, or mix pallet, nut by finish rolling screw thread, metallic rod body is generally produced by hot rolling, its technical process is converter smelting → refining furnace → continuous casting → blank inspection → process furnace heating → mill milling → finishing and collecting, and its production cost is high, and chemical composition design is unreasonable, serious waste of resources, does not meet the needs of conservation-minded society's development.
Summary of the invention
For above-mentioned technical problem, the object of the present invention is to provide a kind of colliery anchor bar steel and production method thereof.
The technical solution used in the present invention is:
A kind of colliery anchor bar steel, by mass percentage by following elementary composition: C:0.20-0.25%, Mn:0.85-1.55%, Si:0.40-0.70%, V:0.025-0.095%, P≤0.040%, S≤0.040%, Cr≤0.10%, Ni≤0.10%, Cu≤0.15%, surplus is iron and impurity element.
Colliery of the present invention anchor bar steel, wherein, the yield strength >=400MPa of described colliery anchor bar steel, tensile strength >=585MPa, extensibility >=18%.
A production method for colliery anchor bar steel, comprises the following steps:
(1) converter smelting operation: adopt conventional process for making to smelt, it is 0.04-0.12% that converter one falls to control end point carbon mass percentage, converter terminal temperature 1660 DEG C ~ 1680 DEG C;
(2) ladle vanadium micro-alloying operation: adopt ladle vanadium tapping process microalloying;
(3) continuous casting working procedure: adopt the casting of continuous caster full guard, flows the casting of billet caster tissue by five machines five, Metal in Tundish liquid level 600-650mm, Metal in Tundish target superheat degree 25-28 DEG C; Pulling rate is 2.6m/min-3.0m/min; Two cold specific waters are 1.0-1.3L/kg steel;
(4) process furnace heating process: adopt process furnace heating, be divided into three sections: preheating section temperature controls at 600-1000 DEG C, heating zone temperature controls at 960-1100 DEG C, soaking zone temperature controls at 1080-1120 DEG C, and described preheating section, described heating zone and described soaking zone time control respectively at 15-20 minute;
(5) continuous rolling operation: in continuous rolling operation, start rolling temperature 980-1000 DEG C, finishing temperature 980 DEG C;
(6) rear fast cooling working procedure is rolled: adopt syllogic stepped control, namely one cold section, secondary cooling zone and air cooling section three phases, one cold section of water tank controlled rolling temperature is at 900-920 DEG C, secondary cooling zone tank outlet temperature 650-680 DEG C, air cooling section tank outlet temperature 650-680 DEG C, upper cold bed tempering temperature controls at 800-820 DEG C.
The production method of colliery of the present invention anchor bar steel, wherein, in ladle vanadium micro-alloying operation described in step (2), tap 1/3 time first add Si-Al-Ba alloy and aluminium ingot reductor, add VN alloy again, tap 2/3 time reinforced to terminate, in tapping process, steel ladle full ensures soft blow, and tapping terminates rear guarantee argon blowing time >=5min.
The production method of colliery of the present invention anchor bar steel, wherein, in the continuous casting working procedure described in step (3), the submerged nozzle of described tundish and stopper adopt alumina graphite material.
The production method of colliery of the present invention anchor bar steel, wherein, in the continuous casting working procedure described in step (3), continuously cast bloom shrinkage cavity rank 0-2 level.
The production method of colliery of the present invention anchor bar steel, wherein, in the continuous casting working procedure described in step (3), crystallizer protecting residue adopts soft steel billet continuous casting slag.
The production method of colliery of the present invention anchor bar steel, wherein, the casting cycle of the full guard casting described in step (3) is 20-25min/ stove.
Beneficial effect of the present invention:
Colliery provided by the invention anchor bar steel, by mass percentage by following elementary composition: C:0.20%-0.25%, Mn:0.85%-1.55%, Si:0.40-0.70%, V:0.025-0.095%, P≤0.040%, S≤0.040%, Cr≤0.10%, Ni≤0.10%, Cu≤0.15%, surplus is iron and impurity element, its yield strength >=400MPa, tensile strength >=585MPa, extensibility >=18%.
The production method of colliery provided by the invention anchor bar steel take straight carbon steel as raw material, by adding v element in straight carbon steel, adopting the micro-alloying technology of vanadium, obtaining the colliery anchor bar steel of low-cost and high-performance; Adopt converter smelting, ladle vanadium micro-alloying, full guard casting, steel billet inspection, process furnace heating, continuous rolling, roll the technical process of rear rapid cooling, eliminate refining procedure, not only simplify operation, and saved the energy.
Embodiment
Embodiment 1
A kind of colliery anchor bar steel, by mass percentage by following elementary composition: C:0.22%, Si:0.47%, Mn:1.43%, V:0.075%, P:0.033%, S:0.017%, Cr:0.029%, Ni:0.011%, Cu:0.032%, surplus is Fe and impurity element.
The production method of the present embodiment colliery anchor bar steel, comprises the following steps:
(1) converter smelting operation: with carbon structural steel 20MnSi for steel billet material, conventional process for making is adopted to smelt, the mass percentage that converter one falls to control end point carbon is 0.12%, converter terminal temperature is 1660 DEG C-1680 DEG C, guarantees that tapping temperature meets continuous casting pouring temperature demand;
(2) in the molten steel of ladle vanadium micro-alloying operation: 45t, tap 1/3 time first add 40kg Si-Al-Ba alloy and 20kg aluminium ingot reductor, add VN alloy again, tap 2/3 time reinforced to terminate, in tapping process, steel ladle full ensures soft blow, tapping terminates rear guarantee argon blowing time >=5min, and added alloy must in advance through overbaking;
(3) continuous casting working procedure: adopt 150mm
2small billet whole process protection is cast, and flows the cast of billet caster tissue, casting cycle 20min/ stove by five machines five; Metal in Tundish liquid level 600mm, Metal in Tundish target superheat degree 25 DEG C; Pulling rate is 2.70 ± 0.05m/min; The submerged nozzle of tundish and stopper adopt alumina graphite material; Crystallizer protecting residue adopts soft steel billet continuous casting slag (code name is FRK-D); Continuously cast bloom shrinkage cavity rank 2 grades; Two cold specific waters are 1.1L/kg steel;
(4) process furnace heating process: adopt process furnace heating, be divided into three sections: preheating section temperature controls at 600 DEG C, heating zone temperature controls at 960 DEG C, and soaking zone temperature controls at 1080 DEG C, and preheating section, heating zone and soaking zone time control at 15 minutes respectively;
(5) continuous rolling operation: in continuous rolling operation, start rolling temperature is 980 DEG C, and finishing temperature is 980 DEG C;
(6) rear fast cooling working procedure is rolled: adopt syllogic stepped control, namely one cold section, secondary cooling zone and air cooling section three phases, one cold section of water tank controlled rolling temperature at 900 DEG C, secondary cooling zone tank outlet temperature 650 DEG C, air cooling section tank outlet temperature 650 DEG C, upper cold bed tempering temperature controls at 800 DEG C.
Embodiment 2
A kind of colliery anchor bar steel, by mass percentage by following elementary composition: C:0.25%, Si:0.70%, Mn:0.85%, V:0.025%, P:0.040%, S:0.040%, Cr:0.10%, Ni:0.10%, Cu:0.15%, surplus is Fe and impurity element.
The production method of the present embodiment colliery anchor bar steel, comprises the following steps:
(1) converter smelting operation: with carbon structural steel 20MnSi for steel billet material, adopts conventional process for making to smelt, and end point carbon 0.04% is fallen in converter one, and converter terminal temperature is 1660 DEG C-1680 DEG C;
(2) in the molten steel of ladle vanadium micro-alloying operation: 45t, tap 1/3 time first add 40kg Si-Al-Ba alloy and 20kg aluminium ingot reductor, add VN alloy again, tap 2/3 time reinforced to terminate, in tapping process, steel ladle full ensures soft blow, tapping terminates rear guarantee argon blowing time >=5min, and added alloy must in advance through overbaking;
(3) continuous casting working procedure: adopt the casting of 150mm2 small billet whole process protection, flow the cast of billet caster tissue by five machines five, casting cycle 25min/ stove; Metal in Tundish liquid level 650mm, Metal in Tundish target superheat degree 28 DEG C; Pulling rate is 3.0m/min; The submerged nozzle of tundish and stopper adopt alumina graphite material; Crystallizer protecting residue adopts soft steel billet continuous casting slag (code name is FRK-D); Continuously cast bloom shrinkage cavity rank 0 grade; Two cold specific waters are 1.3L/kg steel;
(4) process furnace heating process: adopt process furnace heating, be divided into three sections: preheating section temperature controls at 1000 DEG C, heating zone temperature controls at 1100 DEG C, and soaking zone temperature controls at 1120 DEG C, and preheating section, heating zone and soaking zone time control at 20 minutes respectively;
(5) continuous rolling operation: in continuous rolling operation, start rolling temperature is 1000 DEG C, and finishing temperature is 980 DEG C;
(6) rear fast cooling working procedure is rolled: adopt syllogic stepped control, namely one cold section, secondary cooling zone and air cooling section three phases, one cold section of water tank controlled rolling temperature at 920 DEG C, secondary cooling zone tank outlet temperature 680 DEG C, air cooling section tank outlet temperature 680 DEG C, upper cold bed tempering temperature controls at 820 DEG C.
With the production method of the colliery anchor bar steel described in the present embodiment 1 and embodiment 2 produce anchor bar steel stable mechanical property, through the inspection of national structural steel Quality Supervision and Inspection Center, reach yield strength >=400MPa, tensile strength >=585MPa, extensibility >=18%.
Above-described embodiment is only be described the preferred embodiment of the present invention; not scope of the present invention is limited; under not departing from the present invention and designing the prerequisite of spirit; the various distortion that those of ordinary skill in the art make technical scheme of the present invention and improvement, all should fall in protection domain that claims of the present invention determines.
Claims (8)
1. a colliery anchor bar steel, it is characterized in that: by mass percentage by following elementary composition: C:0.20-0.25%, Mn:0.85-1.55%, Si:0.40-0.70%, V:0.025-0.095%, P≤0.040%, S≤0.040%, Cr≤0.10%, Ni≤0.10%, Cu≤0.15%, surplus is iron and impurity element.
2. colliery according to claim 1 anchor bar steel, is characterized in that: the yield strength >=400MPa of described colliery anchor bar steel, tensile strength >=585MP, extensibility >=18%.
3. the production method of the colliery anchor bar steel described in claim 1 or 2, is characterized in that: comprise the following steps:
(1) converter smelting operation: adopt conventional process for making to smelt, it is 0.04-0.12% that converter one falls to control end point carbon mass percentage, converter terminal temperature 1660 DEG C ~ 1680 DEG C;
(2) ladle vanadium micro-alloying operation: adopt ladle vanadium tapping process microalloying;
(3) continuous casting working procedure: adopt the casting of continuous caster full guard, flows the cast of billet caster tissue by five machines five, Metal in Tundish liquid level 600-650mm, Metal in Tundish target superheat degree 25-28 DEG C; Pulling rate is 2.6m/min-3.0m/min; Two cold specific waters are 1.0-1.3L/kg steel;
(4) process furnace heating process: adopt process furnace heating, be divided into three sections: preheating section temperature controls at 600-1000 DEG C, heating zone temperature controls at 960-1100 DEG C, soaking zone temperature controls at 1080-1120 DEG C, and described preheating section, described heating zone and described soaking zone time control respectively at 15-20 minute;
(5) continuous rolling operation: in continuous rolling operation, start rolling temperature 980-1000 DEG C, finishing temperature 980 DEG C;
(6) rear fast cooling working procedure is rolled: adopt syllogic stepped control, namely one cold section, secondary cooling zone and air cooling section three phases, one cold section of water tank controlled rolling temperature is at 900-920 DEG C, secondary cooling zone tank outlet temperature 650-680 DEG C, air cooling section tank outlet temperature 650-680 DEG C, upper cold bed tempering temperature controls at 800-820 DEG C.
4. the production method of colliery according to claim 3 anchor bar steel, it is characterized in that: in the ladle vanadium micro-alloying operation described in step (2), tap 1/3 time first add Si-Al-Ba alloy and aluminium ingot reductor, add VN alloy again, tap 2/3 time reinforced to terminate, in tapping process, steel ladle full ensures soft blow, and tapping terminates rear guarantee argon blowing time >=5min.
5. the production method of colliery anchor bar steel according to claim 3, is characterized in that: in the continuous casting working procedure described in step (3), and the submerged nozzle of described tundish and stopper adopt alumina graphite material.
6. the production method of colliery anchor bar steel according to claim 3, is characterized in that: in the continuous casting working procedure described in step (3), continuously cast bloom shrinkage cavity rank 0-2 level.
7. the production method of colliery anchor bar steel according to claim 3, is characterized in that: in the continuous casting working procedure described in step (3), and crystallizer protecting residue adopts soft steel billet continuous casting slag.
8. the production method of colliery anchor bar steel according to claim 3, is characterized in that: the casting cycle of the full guard casting described in step (3) is 20-25min/ stove.
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| CN105256241A (en) * | 2015-11-13 | 2016-01-20 | 北方工业大学 | High-strength anchor rod |
| CN108754305A (en) * | 2018-05-23 | 2018-11-06 | 何满潮 | NPR is nonmagnetic anchor pole Steel material and its production method |
| CN109022688A (en) * | 2018-08-10 | 2018-12-18 | 杭州市机械科学研究院有限公司 | Hollow bolt processing method and hollow bolt pressure are quenched machine |
| WO2019222943A1 (en) * | 2018-05-23 | 2019-11-28 | He Manchao | Npr nonmagnetic anchor rod steel material and production method therefor |
| CN114231839A (en) * | 2021-11-23 | 2022-03-25 | 通化钢铁股份有限公司 | Mining anchor rod steel suitable for deep processing of 500MPa level and production method |
| CN115505855A (en) * | 2022-09-22 | 2022-12-23 | 陕西欣阳美航实业有限公司 | Production method of multifunctional anchor rod steel for coal mine |
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| CN114231839A (en) * | 2021-11-23 | 2022-03-25 | 通化钢铁股份有限公司 | Mining anchor rod steel suitable for deep processing of 500MPa level and production method |
| CN115505855A (en) * | 2022-09-22 | 2022-12-23 | 陕西欣阳美航实业有限公司 | Production method of multifunctional anchor rod steel for coal mine |
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