CN103060676A - Annealing-free wire rod for 10-grade high-strength nut and production method of annealing-free wire rod - Google Patents
Annealing-free wire rod for 10-grade high-strength nut and production method of annealing-free wire rod Download PDFInfo
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- CN103060676A CN103060676A CN201210419067XA CN201210419067A CN103060676A CN 103060676 A CN103060676 A CN 103060676A CN 201210419067X A CN201210419067X A CN 201210419067XA CN 201210419067 A CN201210419067 A CN 201210419067A CN 103060676 A CN103060676 A CN 103060676A
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Abstract
The invention provides an annealing-free wire rod for a 10-grade high-strength nut and a production method of the annealing-free wire rod. The annealing-free wire rod comprises the following chemical components in percentage by weight: 0.29-0.36% of carbon, 0.40-0.65% of manganese, less than or equal to 0.08% of silicon, less than or equal to 0.025% of sulfur, less than or equal to 0.025% of phosphorus and 0.0025-0.0050% of boron. The annealing-free wire rod provided by the invention has the tensile strength of less than or equal to 530Mpa, the elongation percentage of more than 28% and the surface shrinkage percentage of more than 50% and has qualified 1/3 cold heading performance and excellent integral performance. Due to the adoption of the method, the production cost of the nut is reduced, and significant consumption reducing, energy saving and environment protecting effects are achieved.
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 of producing according to metallurgical production technical process of the prior art, in the 10 grade high-strength nut processes of making, in order to satisfy the requirement of aximal deformation value cold-heading processing characteristics, before cold-drawn and cold upset forming, need to carry out Spheroidizing Annealing consuming time, power consumption and process, have low resistance to deformation and excellent plasticity to reach, 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 traditional carbide annealing process is improved, shortened annealing time, but still needed the off-line Spheroidizing Annealing.Chinese invention patent: the patent No. 200410103089.0, the 8.8 grade high-strength cold forging steels production method of hot-rolling anneal-free coil rod.Although it is softening that the medium carbon cold heading steel wire rod is directly obtained, the medium carbon cold heading steel wire rod of can exempting to anneal is made 8.8 grade high-strength bolts, save the front annealing operation of cold-heading, but owing to only pearlitic carbide has been carried out the fragmentation processing, only has the part nodularization, exempt from annealing therefore can only be used for inside and outside hexagonal 8.8 grade bolts, and can not be used for the again nut fastener of complexity of shape.
Summary of the invention
Technical problem to be solved by this invention is: for deficiency of the prior art, provide 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, described high strength nut with the chemical composition of anneal-free coil rod is: the weight percent of carbon content is controlled at 0.29～0.36%, the weight percent of manganese content is controlled at 0.40～0.65%, the weight percent of silicone content is controlled at≤and 0.08%, the weight percent of sulphur content is controlled at≤0.025%, the weight percent of phosphorus content is controlled at≤and 0.025%, the weight percent of boron content is controlled at 0.0025～0.0050%.
The present invention also relates to the production method that 10 grade high-strength nuts are used anneal-free coil rod simultaneously, the step of described production method is: when by the high-speed rod hot rolls strand being rolled into the steel gren rod that can make high strength nut, be controlled at the heat-up time of described strand between 65～100 minutes, heating and temperature control between 1000～1200 ℃, furnace pressure is controlled at≤scope of 5 handkerchiefs in; The start rolling temperature of rolling temperature is controlled between 1000～1100 ℃, and finishing temperature is controlled between 720～800 ℃, and laying temperature is controlled between 730～810 ℃; When the described steel gren rod that is rolled into carries out cooling process, the steel gren rod is cooled to 720～660 ℃ of interval phase transformations with the speed of 3 ℃/s～10 ℃/s, and in 3 ℃/s～10 ℃/the lower-speed state slow cooling of s isothermal or 0.2 ℃/below the s, after the soaking time 600～1800 seconds, steel gren rod naturally cooling.
Adopt technical scheme of the present invention, can obtain following beneficial effect:
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 are qualified, excellent combination property.The 10 grade high-strength nuts of the present invention production method of anneal-free coil rod, not only saved annealing operation, and the high strength nut end properties of processing meets GB/T3098.2-2000 to the indices in 10 grades of nuts (coarse thread rib-loop) standard in the fastening piece mechanical property, and the wire rod poker characteristic is good, the properties scattered error is also less, therefore, adopt 10 grade high-strength nuts of the present invention with the production method of anneal-free coil rod and anneal-free coil rod, can greatly reduce the production cost of nut, have significant energy-conservation of consumption reduction, environment protecting.
Embodiment
Below by the description to embodiment, the effect of the mutual alignment between the shape of the specific embodiment of the present invention such as related each member, structure, the each several part and annexation, each several part and principle of work etc. are described in further detail:
The present invention is a kind of 10 grade high-strength nut anneal-free coil rods, described high strength nut with the chemical composition of anneal-free coil rod is: the weight percent of carbon content is controlled at 0.29～0.36%, the weight percent of manganese content is controlled at 0.40～0.65%, the weight percent of silicone content is controlled at≤and 0.08%, the weight percent of sulphur content is controlled at≤0.025%, the weight percent of phosphorus content is controlled at≤and 0.025%, the weight percent of boron content is controlled at 0.0025～0.0050%.
The present invention also relates to the production method that 10 grade high-strength nuts are used anneal-free coil rod simultaneously, the step of described production method is: when by the high-speed rod hot rolls strand being rolled into the steel gren rod that can make high strength nut, be controlled at the heat-up time of described strand between 65～100 minutes, heating and temperature control between 1000～1200 ℃, furnace pressure is controlled at≤scope of 5 handkerchiefs in; The start rolling temperature of rolling temperature is controlled between 1000～1100 ℃, and finishing temperature is controlled between 720～800 ℃, and laying temperature is controlled between 730～810 ℃; When the described steel gren rod that is rolled into carries out cooling process, the steel gren rod is cooled to 720～660 ℃ of interval phase transformations with the speed of 3 ℃/s～10 ℃/s, and in 3 ℃/s～10 ℃/the lower-speed state slow cooling of s isothermal or 0.2 ℃/below the s, after the soaking time 600～1800 seconds, steel gren rod naturally cooling.
The below is the specific embodiment of the steel processing high strength nut of production method production of the present invention:
Embodiment 1: press the cold heading steel gren rod of the φ 12.0mm specification of explained hereafter of the present invention, tensile strength 500 MPa, unit elongation 32.5%, reduction of area 54%.Save annealing operation, through pickling → phosphatization → be drawn to φ 11.5 mm, cold-heading molding is made M12 nut (small powder gross distortion), after quenching, the tempering, after testing, properties meets GB/T3098.2-2000 to the indices in 10 grades of nuts (coarse thread rib-loop) standard in the fastening piece mechanical property.
Embodiment 2: press the cold heading steel gren rod of the φ 12.0mm specification of explained hereafter of the present invention, tensile strength 515 MPa, unit elongation 32%, reduction of area 55%.Save annealing operation, through pickling → phosphatization → be drawn to φ 11.3 mm, cold-heading molding is made M8 nut (aniseed small deformation), after quenching, the tempering, detects properties and meets GB/T3098.2-2000 to the indices in 10 grades of nuts (coarse thread rib-loop) standard in the fastening piece mechanical property.
Embodiment 3: press the cold heading steel gren rod of the φ 16.0mm specification of explained hereafter of the present invention, tensile strength 500 MPa, unit elongation 32%, reduction of area 61%.Save annealing operation, through pickling → phosphatization → be drawn to φ 15.5 mm, cold-heading molding is made M16 nut (small powder gross distortion), after quenching, the tempering, detects properties and meets GB/T3098.2-2000 to the indices in 10 grades of nuts (coarse thread rib-loop) standard in the fastening piece mechanical property.
Embodiment 4: press the cold heading steel gren rod of the φ 16.0mm specification of explained hereafter of the present invention, tensile strength 495MPa, unit elongation 32.5%, reduction of area 53.5%.Save annealing operation, through pickling → phosphatization → be drawn to φ 15.2 mm, cold-heading molding is made M10 nut (aniseed small deformation), and quenching, tempering postorder detect properties and meet GB/T3098.2-2000 to the indices in 10 grades of nuts (coarse thread rib-loop) standard in the fastening piece mechanical property.
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 are qualified, excellent combination property.The 10 grade high-strength nuts of the present invention production method of anneal-free coil rod, not only saved annealing operation, and the high strength nut end properties of processing meets GB/T3098.2-2000 to the indices in 10 grades of nuts (coarse thread rib-loop) standard in the fastening piece mechanical property, and the wire rod poker characteristic is good, the properties scattered error is also less, therefore, adopt 10 grade high-strength nuts of the present invention with the production method of anneal-free coil rod and anneal-free coil rod, can greatly reduce the production cost of nut, have significant energy-conservation of consumption reduction, environment protecting.
The above has carried out exemplary description to the present invention; obviously the concrete realization of the present invention is not subjected to the restriction of aforesaid way; as long as the various improvement of having adopted method design of the present invention and technical scheme to carry out; or without improving design of the present invention and technical scheme are directly applied to other occasions, all in protection scope of the present invention.
Claims (2)
1. grade high-strength nut anneal-free coil rod, it is characterized in that: described high strength nut with the chemical composition of anneal-free coil rod is: the weight percent of carbon content is controlled at 0.29～0.36%, the weight percent of manganese content is controlled at 0.40～0.65%, the weight percent of silicone content is controlled at≤and 0.08%, the weight percent of sulphur content is controlled at≤0.025%, the weight percent of phosphorus content is controlled at≤and 0.025%, the weight percent of boron content is controlled at 0.0025～0.0050%.
2. 10 grade high-strength nuts as claimed in claim 1 are with the production method of anneal-free coil rod, it is characterized in that: when by the high-speed rod hot rolls strand being rolled into the steel gren rod that can make high strength nut, be controlled at the heat-up time of described strand between 65～100 minutes, heating and temperature control between 1000～1200 ℃, furnace pressure is controlled at≤scope of 5 handkerchiefs in; The start rolling temperature of rolling temperature is controlled between 1000～1100 ℃, and finishing temperature is controlled between 720～800 ℃, and laying temperature is controlled between 730～810 ℃; When the described steel gren rod that is rolled into carries out cooling process, the steel gren rod is cooled to 720～660 ℃ of interval phase transformations with the speed of 3 ℃/s～10 ℃/s, and in 3 ℃/s～10 ℃/the lower-speed state slow cooling of s isothermal or 0.2 ℃/below the s, after the soaking time 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 true CN103060676A (en) | 2013-04-24 |
| CN103060676B CN103060676B (en) | 2015-11-18 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109055692A (en) * | 2018-10-15 | 2018-12-21 | 江苏省沙钢钢铁研究院有限公司 | A kind of pressure vessel is with exempting from anneal Dual-phase steel wire rod and its production method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000239795A (en) * | 1999-02-25 | 2000-09-05 | Kobe Steel Ltd | Rolled wire rod excellent in softening characteristic |
| 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 |
-
2012
- 2012-10-29 CN CN201210419067.XA patent/CN103060676B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000239795A (en) * | 1999-02-25 | 2000-09-05 | Kobe Steel Ltd | Rolled wire rod excellent in softening characteristic |
| 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 |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109055692A (en) * | 2018-10-15 | 2018-12-21 | 江苏省沙钢钢铁研究院有限公司 | A kind of pressure vessel is with exempting from anneal Dual-phase steel wire rod and its production method |
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| CN103060676B (en) | 2015-11-18 |
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