CN103643124A - Processing method of above-600MPa-grade high-strength steel bar connection sleeve - Google Patents
Processing method of above-600MPa-grade high-strength steel bar connection sleeve Download PDFInfo
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Abstract
The invention discloses a processing method of an above-600MPa-grade high-strength steel bar connection sleeve. The sleeve selects No.45 round steel as a raw material, and the No.45 round steel comprises 0.38-0.43wt% of C, 0.8-1.1wt% of Cr, 0.75-1.0wt% of Mn, 0.15-0.25wt% of Mo, 0.15-0.3wt% of Si, below 0.035% of S, below 0.035wt% of P, below 0.035wt% of N, and the balance Fe. The designed processing method of the above-600MPa-grade high-strength steel bar connection sleeve substantially improves the tensile strength and the elongation rate, guarantees the external diameter dimension and fineness of a steel tube, and reduces the friction stress between a tap and the inner wall of the sleeve.
Description
Technical field
The present invention relates to the working method of the above High Strength Steel Bar joint sleeve of a kind of 600MPa level.
Background technology
Country's Iron And Steel Industry " 12 " planning proposes " accelerating to eliminate 335 MPa level Twisted Steels " " strengthen the research of High Strength Steel Bar and High Strength Concrete Structures member anti-seismic performance, carry out 600 MPa levels and above Twisted Steel research and development of products ".Lay special stress on is accelerated the research of 600MPa level and the connection of above reinforcing bar.
Up to the present, on market, there is not batch production and sell in the joint sleeve of 600MPa level and above reinforcing bar, mainly due to producing now No. 45 steel of material of the joint sleeve of high strength cast iron, its tensile strength only has 610MPa, and 1.1 times that do not reach High Strength Steel Bar sleeve design principle intensity is 830MPa; Simultaneously, the new JGJ163-2013 standard < < reinforcing steel bar machinery sleeve for connection > > putting into effect has stipulated the requirement that raw-material unit elongation is greater than 14%, comprehensive above-mentioned all factors, must have the sleeve starting material of a kind of cost lower (lower than the price of No. 45 steel pipes), high strength (tensile strength is greater than 830MPa), high-ductility (unit elongation is greater than 14%) to produce the sleeve of High Strength Steel Bar.
Summary of the invention
Technical problem to be solved by this invention is, overcome the shortcoming of prior art, provide a kind of and can greatly improve tensile strength and unit elongation, and can guarantee outside dimension and the smooth finish of steel pipe, alleviate the working method of the above High Strength Steel Bar joint sleeve of 600MPa level of screw tap and sleeve lining friction stress.
In order to solve above technical problem, the invention provides the working method of the above High Strength Steel Bar joint sleeve of a kind of 600MPa level, comprise following concrete steps:
Step (1): selecting No. 45 round steel is raw material, the weight percent chemical composition of No. 45 round steel is: C:0.38-0.43%, Cr:0.8-1.1%, Mn:0.75-1.0%, Mo:0.15-0.25%, Si:0.15-0.3%, S:<0.035%, P:<0.035%, N:<0.035%, surplus is Fe, above-mentioned raw materials sent into process furnace and is heated to 1100-1180 ℃, and the drawing steel pipe that is desired size;
Step (2): the steel pipe after heating in step (1) is cooled to 610-630 ℃ through online the first refrigerating work procedure by reinforcing bar fast speed, then in quenching device water or hardening liquid carry out for time 11-13 quench second, then through tempering process furnace, be heated to 600-660 ℃ of tempering, and carry out after alignment processing, then be cooled to normal temperature by the second process for cooling;
Step (3): the steel pipe that is cooled to room temperature in step (2) is sent into and in process furnace, is heated to 810-910 ℃, and by the steel pipe heating the speed of cooling cool to room temperature in rare gas element with 1-3 per second ℃;
Step (4): above-mentioned steel pipe is cut into desired length by automatic cutting off table, form sleeve blank, the equal channel angular pressing that carries out again 6 or 12 equal portions after the extrusion process that is 5-10% through amount of compression by sleeve blank is molded, forms sleeve work in-process;
Step (5): the sleeve work in-process in step (4) are encircleed to wire process, make its endoporus with 2.5 or the screw threads at 75 degree angles of 3mm tooth pitch, add rust-proofing lubricant at arch in wire process;
Step (6): finally sleeve outer wall is fallen to packing warehouse-in after miter angle.
The technical scheme that the present invention further limits is:
Further, the working method of the above High Strength Steel Bar joint sleeve of aforesaid 600MPa level, the weight percent chemical composition of No. 45 round steel is C:0.38%, Cr:1.1%, Mn:0.75%, Mo:0.25%, Si:0.21%, S:0.025%, P:0.03%, N:0.025%, surplus is Fe.
The working method of the above High Strength Steel Bar joint sleeve of aforesaid 600MPa level, the weight percent chemical composition of No. 45 round steel is C:0.43%, Cr:0.9%, Mn:0.85%, Mo:0.2%, Si:0.3%, S:0.013%, P:0.015%, N:0.012%, surplus is Fe.
The working method of the above High Strength Steel Bar joint sleeve of aforesaid 600MPa level, the refrigerating work procedure in step (2) is specially:
Described the first refrigerating work procedure: adopt water-cooled with the rate of cooling of 15-17 ℃/s by reinforcing bar water-cooled to 610-630 ℃;
Described the second refrigerating work procedure: adopt water-cooled to be combined with air cooling, first adopt water-cooled with the rate of cooling of 1-2 ℃/s by reinforcing bar water-cooled to 320-350 ℃, then air cooling is to 250-280 ℃, then adopt water-cooled with the rate of cooling of 3-5 ℃/s by reinforcing bar water-cooled to 210-230 ℃, last air cooling is to room temperature.
The working method of the above High Strength Steel Bar joint sleeve of aforesaid 600MPa level, the rare gas element in step (3) is nitrogen.
The invention has the beneficial effects as follows:
It is blank that No. 45 steel are take in the present invention, can improve toughness, elasticity, the wear resistance of steel and resist performance, and make steel tight, and the vanadium in steel is highly stable, be difficult for being decomposed by hydrochloric acid, sulfuric acid, add the steel hardenability after vanadium good, can make the whole cross section of steel part obtain the mechanical property of uniformity and can select the quenching medium that steel part quenching stress is little, to reduce distortion and cracking;
In the present invention, added nickel element, can improve firm intensity and toughness, improve the hardening capacity of steel, can change some physicalies of steel, and improve the resistance to corrosion of steel, thereby it is active to improve the atom of C and N element, the air mass that each atom is formed can form strong interaction with dislocation, pinning dislocation, produces yield point elongation, makes to need the external world to provide larger stress just can start dislocation;
The present invention is the cooling generation that is conducive to promote perlite ratio under certain speed of cooling, controls rate of cooling and reaches organic cooperation the between intensity and plasticity, makes tensile strength be greater than 750MPa, and unit elongation is greater than more than 16%;
In the present invention, the steel pipe after heating is cooling in as N gas at rare gas element, prevent that steel pipe from producing more iron scale in process of cooling, guarantee the outside dimension of steel pipe and the requirement of smooth finish;
After tempering of the present invention, adopt water-cooled to be combined with air cooling, be followed successively by: water-cooled-air cooling-water-cooled-air cooling, like this, by the cooling control after tempering, can make carbide further fully dissolve, evenly diffusion, avoided carbide to cause intergranular corrosion and spot corrosion to exceed standard separating out of intergranular, guaranteed that the ferrite content of material is in 30% left and right, can further make material solid solution abundant, avoided heat treatment mode heating uneven, the erosion rate that solid solution inequality is brought exceeds standard and hardness exceeds standard, and has consolidated and has smelted the technique effect that postheat treatment technique produces above.
The present invention, by the sleeve of 5-10% Equal Channel Angular Pressing, makes sleeve form inside racking stress, impels sleeve work hardening, is slightly losing under the condition of ductility, significantly improves tensile strength to more than 850MPa, meets the design requirements of 600MPa level sleeve;
The present invention adopts rust-proofing lubricant in arch silk process, and the screw thread that is conducive to sleeve lining is antirust for a long time, also plays and alleviates screw tap and sleeve lining friction stress simultaneously.
Embodiment
embodiment 1
The working method of the above High Strength Steel Bar joint sleeve of a kind of 600MPa level that the present embodiment provides, comprises following concrete steps:
Step (1): selecting No. 45 round steel is raw material, the weight percent chemical composition of No. 45 round steel is C:0.38%, Cr:1.1%, Mn:0.75%, Mo:0.25%, Si:0.21%, S:0.025%, P:0.03%, N:0.025%, surplus is Fe, above-mentioned raw materials sent into process furnace and is heated to 1100 ℃, and the drawing steel pipe that is desired size;
Step (2): the steel pipe after heating in step (1) is cooled to 610 ℃ through online the first refrigerating work procedure by reinforcing bar fast speed, then in quenching device water or hardening liquid carry out for time 11-13 quench second, then through tempering process furnace, be heated to 600 ℃ of tempering, and carry out after alignment processing, by the second process for cooling, be cooled to normal temperature again, concrete process for cooling is:
Described the first refrigerating work procedure: adopt water-cooled with the rate of cooling of 15-17 ℃/s by reinforcing bar water-cooled to 610 ℃;
Described the second refrigerating work procedure: adopt water-cooled to be combined with air cooling, first adopt water-cooled with the rate of cooling of 1-2 ℃/s by reinforcing bar water-cooled to 320 ℃, then air cooling to 250 ℃, then adopt water-cooled with the rate of cooling of 3-5 ℃/s by reinforcing bar water-cooled to 210 ℃, last air cooling is to room temperature;
Step (3): the steel pipe that is cooled to room temperature in step (2) is sent in process furnace and is heated to 810 ℃, and by the steel pipe heating the speed of cooling cool to room temperature in nitrogen with 1-3 per second ℃;
Step (4): above-mentioned steel pipe is cut into desired length by automatic cutting off table, form sleeve blank, the equal channel angular pressing that sleeve blank is carried out after the amount of compression of 5-10% to 6 or 12 equal portions is molded, forms sleeve work in-process;
Step (5): the sleeve work in-process in step (4) are encircleed to wire process, make its endoporus with 2.5 or the screw threads at 75 degree angles of 3mm tooth pitch, add rust-proofing lubricant at arch in wire process;
Step (6): finally sleeve outer wall is fallen to packing warehouse-in after miter angle.
embodiment 2
The working method of the above High Strength Steel Bar joint sleeve of a kind of 600MPa level that the present embodiment provides, comprises following concrete steps:
Step (1): selecting No. 45 round steel is raw material, the weight percent chemical composition of No. 45 round steel is C:0.43%, Cr:0.9%, Mn:0.85%, Mo:0.2%, Si:0.3%, S:0.013%, P:0.015%, N:0.012%, surplus is Fe, above-mentioned raw materials sent into process furnace and is heated to 1180 ℃, and the drawing steel pipe that is desired size;
Step (2): the steel pipe after heating in step (1) is cooled to 630 ℃ through online the first refrigerating work procedure by reinforcing bar fast speed, then in quenching device water or hardening liquid carry out for time 11-13 quench second, then through tempering process furnace, be heated to 660 ℃ of tempering, and carry out after alignment processing, by the second process for cooling, be cooled to normal temperature again, refrigerating work procedure is specially:
Described the first refrigerating work procedure: adopt water-cooled with the rate of cooling of 15-17 ℃/s by reinforcing bar water-cooled to 630 ℃;
Described the second refrigerating work procedure: adopt water-cooled to be combined with air cooling, first adopt water-cooled with the rate of cooling of 1-2 ℃/s by reinforcing bar water-cooled to 350 ℃, then air cooling to 280 ℃, then adopt water-cooled with the rate of cooling of 3-5 ℃/s by reinforcing bar water-cooled to 230 ℃, last air cooling is to room temperature;
Step (3): the steel pipe that is cooled to room temperature in step (2) is sent in process furnace and is heated to 910 ℃, and by the steel pipe heating the speed of cooling cool to room temperature in nitrogen with 1-3 per second ℃;
Step (4): above-mentioned steel pipe is cut into desired length by automatic cutting off table, form sleeve blank, the equal channel angular pressing that carries out again 6 or 12 equal portions after the extrusion process that is 5-10% through amount of compression by sleeve blank is molded, forms sleeve work in-process;
Step (5): the sleeve work in-process in step (4) are encircleed to wire process, make its endoporus with 2.5 or the screw threads at 75 degree angles of 3mm tooth pitch, add rust-proofing lubricant at arch in wire process;
Step (6): finally sleeve outer wall is fallen to packing warehouse-in after miter angle.
embodiment 3
The working method of the above High Strength Steel Bar joint sleeve of a kind of 600MPa level that the present embodiment provides, comprises following concrete steps:
Step (1): selecting No. 45 round steel is raw material, the weight percent chemical composition of No. 45 round steel is: C:0.41%, Cr:0.8%, Mn:1.0%, Mo:0.15%, Si:0.15%, S:0.015%, P:0.025%, N:0.015%, surplus is Fe, above-mentioned raw materials sent into process furnace and is heated to 1150 ℃, and the drawing steel pipe that is desired size;
Step (2): the steel pipe after heating in step (1) is cooled to 620 ℃ through online the first refrigerating work procedure by reinforcing bar fast speed, then in quenching device water or hardening liquid carry out for time 11-13 quench second, then through tempering process furnace, be heated to 640 ℃ of tempering, and carry out after alignment processing, by the second process for cooling, be cooled to normal temperature again, refrigerating work procedure is specially:
Described the first refrigerating work procedure: adopt water-cooled with the rate of cooling of 15-17 ℃/s by reinforcing bar water-cooled to 620 ℃;
Described the second refrigerating work procedure: adopt water-cooled to be combined with air cooling, first adopt water-cooled with the rate of cooling of 1-2 ℃/s by reinforcing bar water-cooled to 330 ℃, then air cooling to 260 ℃, then adopt water-cooled with the rate of cooling of 3-5 ℃/s by reinforcing bar water-cooled to 220 ℃, last air cooling is to room temperature;
Step (3): the steel pipe that is cooled to room temperature in step (2) is sent in process furnace and is heated to 880 ℃, and by the steel pipe heating the speed of cooling cool to room temperature in nitrogen with 1-3 per second ℃;
Step (4): above-mentioned steel pipe is cut into desired length by automatic cutting off table, form sleeve blank, the equal channel angular pressing that carries out again 6 or 12 equal portions after the extrusion process that is 5-10% through amount of compression by sleeve blank is molded, forms sleeve work in-process;
Step (5): the sleeve work in-process in step (4) are encircleed to wire process, make its endoporus with 2.5 or the screw threads at 75 degree angles of 3mm tooth pitch, add rust-proofing lubricant at arch in wire process;
Step (6): finally sleeve outer wall is fallen to packing warehouse-in after miter angle.
In addition to the implementation, the present invention can also have other embodiments, and all employings are equal to the technical scheme of replacement or equivalent transformation formation, all drop on the protection domain of requirement of the present invention.
Claims (5)
1. a working method for the above High Strength Steel Bar joint sleeve of 600MPa level, is characterized in that, comprises following concrete steps:
Step (1): selecting No. 45 round steel is raw material, the weight percent chemical composition of described No. 45 round steel is: C:0.38-0.43%, Cr:0.8-1.1%, Mn:0.75-1.0%, Mo:0.15-0.25%, Si:0.15-0.3%, S:<0.035%, P:<0.035%, N:<0.035%, surplus is Fe, above-mentioned raw materials sent into process furnace and is heated to 1100-1180 ℃, and the drawing steel pipe that is desired size;
Step (2): the steel pipe after heating in step (1) is cooled to 610-630 ℃ through online the first refrigerating work procedure by reinforcing bar fast speed, then in quenching device water or hardening liquid carry out for time 11-13 quench second, then through tempering process furnace, be heated to 600-660 ℃ of tempering, and carry out after alignment processing, then be cooled to normal temperature by the second process for cooling;
Step (3): the steel pipe that is cooled to room temperature in step (2) is sent into and in process furnace, is heated to 810-910 ℃, and by the steel pipe heating the speed of cooling cool to room temperature in rare gas element with 1-3 per second ℃;
Step (4): above-mentioned steel pipe is cut into desired length by automatic cutting off table, form sleeve blank, the equal channel angular pressing that carries out again 6 or 12 equal portions after the extrusion process that is 5-10% through amount of compression by sleeve blank is molded, forms sleeve work in-process;
Step (5): the sleeve work in-process in step (4) are encircleed to wire process, make its endoporus with 2.5 or the screw threads at 75 degree angles of 3mm tooth pitch, add rust-proofing lubricant at arch in wire process;
Step (6): finally sleeve outer wall is fallen to packing warehouse-in after miter angle.
2. the working method of the above High Strength Steel Bar joint sleeve of 600MPa level according to claim 1, it is characterized in that, the weight percent chemical composition of described No. 45 round steel is C:0.38%, Cr:1.1%, Mn:0.75%, Mo:0.25%, Si:0.21%, S:0.025%, P:0.03%, N:0.025%, surplus is Fe.
3. the working method of the above High Strength Steel Bar joint sleeve of 600MPa level according to claim 1, it is characterized in that, the weight percent chemical composition of described No. 45 round steel is C:0.43%, Cr:0.9%, Mn:0.85%, Mo:0.2%, Si:0.3%, S:0.013%, P:0.015%, N:0.012%, surplus is Fe.
4. the working method of the above High Strength Steel Bar joint sleeve of 600MPa level according to claim 1, is characterized in that, the refrigerating work procedure in step (2) is specially:
Described the first refrigerating work procedure: adopt water-cooled with the rate of cooling of 15-17 ℃/s by reinforcing bar water-cooled to 610-630 ℃;
Described the second refrigerating work procedure: adopt water-cooled to be combined with air cooling, first adopt water-cooled with the rate of cooling of 1-2 ℃/s by reinforcing bar water-cooled to 320-350 ℃, then air cooling is to 250-280 ℃, then adopt water-cooled with the rate of cooling of 3-5 ℃/s by reinforcing bar water-cooled to 210-230 ℃, last air cooling is to room temperature.
5. the working method of the above High Strength Steel Bar joint sleeve of 600MPa level according to claim 1, is characterized in that, the rare gas element in described step (3) is nitrogen.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104328346A (en) * | 2014-11-08 | 2015-02-04 | 江苏天舜金属材料集团有限公司 | Processing process of wear-resisting anti-impact type pile foundation steel protective barrel |
| CN104372951A (en) * | 2014-11-08 | 2015-02-25 | 江苏天舜金属材料集团有限公司 | Processing method for chrome molybdenum low alloy prestressed steel reinforcement connection joint |
| CN106425302A (en) * | 2016-10-27 | 2017-02-22 | 中国航空工业集团公司洛阳电光设备研究所 | Machining method of high-coaxiality sealing thread of thin-wall conical part |
| CN108907631A (en) * | 2018-08-23 | 2018-11-30 | 江苏华太电力仪表有限公司 | A kind of preparation process of high temperature resistant leakage-free ball valve spool |
| CN108942106A (en) * | 2018-08-11 | 2018-12-07 | 湖北博士隆科技股份有限公司 | A kind of production and processing method of aluminium set cylinder |
| CN111187986A (en) * | 2020-02-18 | 2020-05-22 | 山东钢铁股份有限公司 | Low-alloy high-strength sleeve for connecting high-strength steel bars and preparation method thereof |
| CN115261720A (en) * | 2022-06-29 | 2022-11-01 | 张家港荣盛特钢有限公司 | Fire-resistant steel bar mechanical connecting sleeve, wire rod and production method of wire rod |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104328346A (en) * | 2014-11-08 | 2015-02-04 | 江苏天舜金属材料集团有限公司 | Processing process of wear-resisting anti-impact type pile foundation steel protective barrel |
| CN104372951A (en) * | 2014-11-08 | 2015-02-25 | 江苏天舜金属材料集团有限公司 | Processing method for chrome molybdenum low alloy prestressed steel reinforcement connection joint |
| CN106425302A (en) * | 2016-10-27 | 2017-02-22 | 中国航空工业集团公司洛阳电光设备研究所 | Machining method of high-coaxiality sealing thread of thin-wall conical part |
| CN108942106A (en) * | 2018-08-11 | 2018-12-07 | 湖北博士隆科技股份有限公司 | A kind of production and processing method of aluminium set cylinder |
| CN108942106B (en) * | 2018-08-11 | 2022-06-24 | 湖北博士隆科技有限公司 | Production and processing method of aluminum sleeve |
| CN108907631A (en) * | 2018-08-23 | 2018-11-30 | 江苏华太电力仪表有限公司 | A kind of preparation process of high temperature resistant leakage-free ball valve spool |
| CN111187986A (en) * | 2020-02-18 | 2020-05-22 | 山东钢铁股份有限公司 | Low-alloy high-strength sleeve for connecting high-strength steel bars and preparation method thereof |
| CN115261720A (en) * | 2022-06-29 | 2022-11-01 | 张家港荣盛特钢有限公司 | Fire-resistant steel bar mechanical connecting sleeve, wire rod and production method of wire rod |
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| CN103643124B (en) | 2015-09-16 |
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