CN103060676B - A kind of 10 grade high-strength nut anneal-free coil rod and production methods thereof - Google Patents
A kind of 10 grade high-strength nut anneal-free coil rod and production methods thereof Download PDFInfo
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Abstract
The invention provides a kind of 10 grade high-strength nut anneal-free coil rods, also relate to the production method of this wire rod simultaneously, the chemical composition of described anneal-free coil rod is: the weight percent of carbon content controls 0.29 ~ 0.36%, the weight percent of Fe content controls 0.40 ~ 0.65%, the weight percent of silicone content controls≤0.08%, the weight percent of sulphur content controls≤0.025%, the weight percent of phosphorus content controls≤0.025%, the weight percent of Boron contents controls 0.0025 ~ 0.0050%, 10 grade high-strength nut anneal-free coil rods of the present invention, its tensile strength≤530? MPa, unit elongation >=28%, reduction of area >=50%, 1/3 cold-heading is qualified, excellent combination property, adopt production method of the present invention, greatly can reduce the production cost of nut, there is significant energy-conservation of consumption reduction, environment protecting.<!--1-->
Description
Technical field
The invention belongs to steel production and processing technology technical field, more particularly, relate to a kind of 10 grade high-strength nut anneal-free coil rods, the present invention also relates to the production method of this wire rod simultaneously.
Background technology
The medium carbon cold heading steel that metallurgical production process flow process is conventionally produced, in making 10 grade high-strength nut process, in order to meet the requirement of aximal deformation value cold-heading processing characteristics, before cold-drawn and cold upset forming, need to carry out Spheroidizing Annealing process that is consuming time, power consumption, to reach, there is low resistance to deformation and excellent plasticity, this anneal often the cycle long, consume a large amount of energy and resource, also contaminate environment.Chinese invention patent: the patent No. 99115353.7, the carbide annealing process of high-speed great-deformation hot-rolled and cold-upset steel carbide.Although improve traditional carbide annealing process, shorten annealing time, but still need off-line Spheroidizing Annealing.Chinese invention patent: the patent No. 200410103089.0, the production method of 8.8 grade high-strength cold forging steel hot-rolling anneal-free coil rods.Although it is softening to make medium carbon cold heading steel wire rod directly obtain online, annealing medium carbon cold heading steel wire rod can be exempted from and make 8.8 grade high-strength bolts, save the annealing operation before cold-heading, but owing to only pearlitic carbide having been carried out fragmentation process, only has part nodularization, therefore inside and outside hexagonal 8.8 grade bolt can only be used for exempt from annealing, and shape nut fastener complicated again can not be used for.
Summary of the invention
Technical problem to be solved by this invention is: for deficiency of the prior art, provides a kind of 10 grade high-strength nut anneal-free coil rods with good cold-drawn and cold heading technique performance.
Solve above-described technical problem, the technical scheme that the present invention takes is:
The present invention is a kind of 10 grade high-strength nut anneal-free coil rods, the chemical composition of described high strength nut anneal-free coil rod is: the weight percent of carbon content controls 0.29 ~ 0.36%, the weight percent of Fe content controls 0.40 ~ 0.65%, the weight percent of silicone content controls≤0.08%, the weight percent of sulphur content controls≤0.025%, and the weight percent of phosphorus content controls≤0.025%, the weight percent of Boron contents controls 0.0025 ~ 0.0050%.
The present invention also relates to the production method of 10 grade high-strength nut anneal-free coil rods simultaneously, the step of described production method is: when strand being rolled into the steel gren rod that can manufacture high strength nut by high-speed rod hot rolls, the heat-up time of described strand controls between 65 ~ 100 minutes, heating and temperature control between 1000 ~ 1200 DEG C, furnace pressure controls in the scope of≤5 handkerchiefs; The start rolling temperature of rolling temperature controls between 1000 ~ 1100 DEG C, and finishing temperature control is between 720 ~ 800 DEG C, and laying temperature controls between 730 ~ 810 DEG C; When the described steel gren rod be rolled into carries out cooling process, steel gren rod is cooled to 720 ~ 660 DEG C of interval phase transformations with the speed of 3 DEG C/s ~ 10 DEG C/s, and in the lower-speed state slow cooling of 0.2 DEG C/below s, soaking time is after 600 ~ 1800 seconds, steel gren rod naturally cooling.
Adopt technical scheme of the present invention, following beneficial effect can be obtained:
10 grade high-strength nut anneal-free coil rods of the present invention, its tensile strength≤530MPa, unit elongation >=28%, reduction of area >=50%, 1/3 cold-heading are qualified, excellent combination property.The production method of 10 grade high-strength nut anneal-free coil rods of the present invention, not only eliminate annealing operation, and the high strength nut end properties of processing meets GB/T3098.2-2000 to the indices in 10 grades of nut (coarse thread rib-loop) standards in fastening piece mechanical property, and wire rod poker characteristic is good, properties scattered error is also less, therefore, adopt the production method of 10 grade high-strength nut anneal-free coil rods of the present invention and anneal-free coil rod, greatly can reduce the production cost of nut, there is significant energy-conservation of consumption reduction, environment protecting.
Embodiment
Contrast accompanying drawing below, by the description to embodiment, the effect and principle of work etc. of the specific embodiment of the present invention as the mutual alignment between the shape of involved each component, structure, each several part and annexation, each several part are described in further detail:
The present invention is a kind of 10 grade high-strength nut anneal-free coil rods, the chemical composition of described high strength nut anneal-free coil rod is: the weight percent of carbon content controls 0.29 ~ 0.36%, the weight percent of Fe content controls 0.40 ~ 0.65%, the weight percent of silicone content controls≤0.08%, the weight percent of sulphur content controls≤0.025%, and the weight percent of phosphorus content controls≤0.025%, the weight percent of Boron contents controls 0.0025 ~ 0.0050%.
The present invention also relates to the production method of 10 grade high-strength nut anneal-free coil rods simultaneously, the step of described production method is: when strand being rolled into the steel gren rod that can manufacture high strength nut by high-speed rod hot rolls, the heat-up time of described strand controls between 65 ~ 100 minutes, heating and temperature control between 1000 ~ 1200 DEG C, furnace pressure controls in the scope of≤5 handkerchiefs; The start rolling temperature of rolling temperature controls between 1000 ~ 1100 DEG C, and finishing temperature control is between 720 ~ 800 DEG C, and laying temperature controls between 730 ~ 810 DEG C; When the described steel gren rod be rolled into carries out cooling process, steel gren rod is cooled to 720 ~ 660 DEG C of interval phase transformations with the speed of 3 DEG C/s ~ 10 DEG C/s, and in the lower-speed state slow cooling of 0.2 DEG C/below s, soaking time is after 600 ~ 1800 seconds, steel gren rod naturally cooling.
Be the specific embodiment of the steel processing high strength nut that production method of the present invention is produced below:
Embodiment 1: the cold heading steel gren rod of the φ 12.0mm specification of producing by present invention process, tensile strength 500MPa, unit elongation 32.5%, reduction of area 54%.Save annealing operation, through pickling → phosphatization → be drawn to φ 11.5mm, cold-heading molding makes M12 nut (small powder gross distortion), after quenching, tempering, after testing, properties meets GB/T3098.2-2000 to the indices in 10 grades of nut (coarse thread rib-loop) standards in fastening piece mechanical property.
Embodiment 2: the cold heading steel gren rod of the φ 12.0mm specification of producing by present invention process, tensile strength 515MPa, unit elongation 32%, reduction of area 55%.Save annealing operation, through pickling → phosphatization → be drawn to φ 11.3mm, cold-heading molding makes M8 nut (aniseed small deformation), after quenching, tempering, detect properties and meet GB/T3098.2-2000 to the indices in 10 grades of nut (coarse thread rib-loop) standards in fastening piece mechanical property.
Embodiment 3: the cold heading steel gren rod of the φ 16.0mm specification of producing by present invention process, tensile strength 500MPa, unit elongation 32%, reduction of area 61%.Save annealing operation, through pickling → phosphatization → be drawn to φ 15.5mm, cold-heading molding makes M16 nut (small powder gross distortion), after quenching, tempering, detect properties and meet GB/T3098.2-2000 to the indices in 10 grades of nut (coarse thread rib-loop) standards in fastening piece mechanical property.
Embodiment 4: the cold heading steel gren rod of the φ 16.0mm specification of producing by present invention process, tensile strength 495MPa, unit elongation 32.5%, reduction of area 53.5%.Save annealing operation, through pickling → phosphatization → be drawn to φ 15.2mm, cold-heading molding makes M10 nut (aniseed small deformation), quenching, tempering postorder, detect properties and meet GB/T3098.2-2000 to the indices in 10 grades of nut (coarse thread rib-loop) standards in fastening piece mechanical property.
10 grade high-strength nut anneal-free coil rods of the present invention, its tensile strength≤530MPa, unit elongation >=28%, reduction of area >=50%, 1/3 cold-heading are qualified, excellent combination property.The production method of 10 grade high-strength nut anneal-free coil rods of the present invention, not only eliminate annealing operation, and the high strength nut end properties of processing meets GB/T3098.2-2000 to the indices in 10 grades of nut (coarse thread rib-loop) standards in fastening piece mechanical property, and wire rod poker characteristic is good, properties scattered error is also less, therefore, adopt the production method of 10 grade high-strength nut anneal-free coil rods of the present invention and anneal-free coil rod, greatly can reduce the production cost of nut, there is significant energy-conservation of consumption reduction, environment protecting.
Above by reference to the accompanying drawings to invention has been exemplary description; the concrete realization of obvious the present invention is not subject to the restrictions described above; as long as have employed the various improvement that method of the present invention is conceived and technical scheme is carried out; or design of the present invention and technical scheme directly applied to other occasions, all in protection scope of the present invention without to improve.
Claims (1)
1. the production method of a grade high-strength nut anneal-free coil rod, the chemical composition of described high strength nut anneal-free coil rod is: the weight percent of carbon content controls 0.29 ~ 0.36%, the weight percent of Fe content controls 0.40 ~ 0.65%, the weight percent of silicone content controls≤0.08%, the weight percent of sulphur content controls≤0.025%, the weight percent of phosphorus content controls≤0.025%, the weight percent of Boron contents controls 0.0025 ~ 0.0050%, it is characterized in that: when strand being rolled into the steel gren rod that can manufacture high strength nut by high-speed rod hot rolls, the heat-up time of described strand controls between 65 ~ 100 minutes, heating and temperature control is between 1000 ~ 1200 DEG C, furnace pressure controls in the scope of≤5 handkerchiefs, the start rolling temperature of rolling temperature controls between 1000 ~ 1100 DEG C, and finishing temperature control is between 720 ~ 800 DEG C, and laying temperature controls between 730 ~ 810 DEG C, when the described steel gren rod be rolled into carries out cooling process, steel gren rod is cooled to 720 ~ 660 DEG C of interval phase transformations with the speed of 3 DEG C/s ~ 10 DEG C/s, and in the lower-speed state slow cooling of 0.2 DEG C/below s, soaking time is after 600 ~ 1800 seconds, steel gren rod naturally cooling.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210419067.XA CN103060676B (en) | 2012-10-29 | 2012-10-29 | A kind of 10 grade high-strength nut anneal-free coil rod and production methods thereof |
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| CN201210419067.XA CN103060676B (en) | 2012-10-29 | 2012-10-29 | A kind of 10 grade high-strength nut anneal-free coil rod and production methods thereof |
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| CN103060676A CN103060676A (en) | 2013-04-24 |
| CN103060676B true CN103060676B (en) | 2015-11-18 |
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| CN109055692B (en) * | 2018-10-15 | 2020-05-22 | 江苏省沙钢钢铁研究院有限公司 | Annealing-free dual-phase steel wire rod for pressure container and production method thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1799717A (en) * | 2004-12-31 | 2006-07-12 | 马鞍山钢铁股份有限公司 | Hot-rolling anneal-free coil rod production method for 8.8 grade high-strength cold forging steel |
| CN101775546A (en) * | 2010-03-19 | 2010-07-14 | 江苏省沙钢钢铁研究院有限公司 | High strength boron-containing cold heading steel for fastener and preparation process thereof |
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| JP2000239795A (en) * | 1999-02-25 | 2000-09-05 | Kobe Steel Ltd | Rolled wire rod excellent in softening characteristic |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1799717A (en) * | 2004-12-31 | 2006-07-12 | 马鞍山钢铁股份有限公司 | Hot-rolling anneal-free coil rod production method for 8.8 grade high-strength cold forging steel |
| CN101775546A (en) * | 2010-03-19 | 2010-07-14 | 江苏省沙钢钢铁研究院有限公司 | High strength boron-containing cold heading steel for fastener and preparation process thereof |
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