CN101585052A - Large-diameter and high-strength finish rolling deformed bar and its manufacturing technique - Google Patents
Large-diameter and high-strength finish rolling deformed bar and its manufacturing technique Download PDFInfo
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- CN101585052A CN101585052A CNA200910143268XA CN200910143268A CN101585052A CN 101585052 A CN101585052 A CN 101585052A CN A200910143268X A CNA200910143268X A CN A200910143268XA CN 200910143268 A CN200910143268 A CN 200910143268A CN 101585052 A CN101585052 A CN 101585052A
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Abstract
The invention relates to a manufacturing technique for cold-working and heat-treating the high tensile steel bar in large scale, particularly to a manufacturing technology of which the accuracy requirement to screw threads is high, the nut connection is used, the tensile strength is more than 550 Mpa, the yield strength is more than 500 Mpa, the elongation at break achieves 10% (10D), the maximum load elongation rate is more than 6% and the fatigue strength in the fatigue test matched with the nut is more than 2 million times (the amplitude is 2sigmaA=sigma0Xsigmau). The product diameter is larger than 20mm. The main production steps are as follows: selecting the large coiled materials; rotating a barrel to unreel; repeating to bend and shuck and calibrating the material, derusting with an iron brush; reducing size with a drawing die, leading the material to generate irregular section; reducing size with the drawing die, then lubricating; reducing size with the drawing die once more, cold-rolling the screw thread, subsequently feeding into an intermediate frequency furnace for heat treatment; finally, cutting to length. The steel bar produced by the method has high strength, good tractility and is suitable for nut connection.
Description
Technical field
The present invention relates to a kind of big specification cold working heat treatment high tensile reinforcement manufacturing technology, relate in particular to a kind of double thread required precision height, major diameter, high-intensity reinforcing bar manufacturing technology.
Background technology
At present, the high tensile reinforcement HRB500 that use the domestic market is the hot-rolled low-alloy steel, increases alloying elements such as manganese silicon boron during smelting, the smelting cost height, and energy resource consumption is big, and rolling time control is cold strict, the production cost height; And accuracy of thread is poor, can't realize that nut connects.
The CRB550 cold rolled reinforcing bar that use in market, lengthening coefficient is little, can not satisfy the high tensile reinforcement performance requirement.And has only the small dimension product, maximum gauge 10mm, the above diameter reinforcing bar of 20mm that can't the processing market demand.The accuracy of thread difference of processing can not use nut to connect.
Now big specification cold working heat treatment high tensile reinforcement production technology is still blank, double thread processing and heat treatment, and equipment all can not meet the demands in the market.And there is not mature technology on the market.
Summary of the invention
The production technology that the purpose of this invention is to provide a kind of large-diameter and high-strength finish rolling deformed bar, its concrete steps are:
7) select for use and coil raw material (∮ 25mmQ235B) greatly;
8) rotary barrel unwrapping wire promptly adopts the movable plug of diameter 800mm, and the rotation unwrapping wire makes material not have reversing in uncoiling process;
9) material is eliminated rust, take the alternating bending of diameter 350-500 major diameter roller to peel off and that material is carried out sedan-chair is straight, use the iron brush treatment;
10) material is used the drawing die tube reducing, and make the material production special-shaped section;
11) drawing die tube reducing, lubricated then;
12) drawing die tube reducing once more, and, next send into the intermediate frequency furnace tempering heat treatment by cold-rolled thread processing, cut scale at last.
The invention has the advantages that:
1, cold working heat treatment high tensile reinforcement manufacturing technology of the present invention, by regular reinforcement is carried out cold working mode, strength of materials performance is significantly improved, reach the high tensile reinforcement requirement of strength, again cold-worked material is heat-treated, make its extension, reduction of area, antidetonation index all reach the high tensile reinforcement requirement;
2, of the present invention, bent in big specification steel processing (more than the diameter 20mm), is to use first to peeling off and iron brush treatment technology, and this operation does not have pickling, phosphatization, does not have environmental pollution;
3, realize the above reinforcing bar of cold rolling 20mm specification first, tensile strength is greater than 550mpa, and yield strength is greater than 500mpa;
4, the finish rolling screw thread technology of material, the domestic high precision screw of realizing is first processed, and reaches the requirement of finish rolling screw thread, realizes that different Zhi Gangcai nuts connect;
5, heat treatment technics has increased the extension property of reinforcing bar, and cold rolling material extends can only reach 8%, and lengthening coefficient reaches more than 10% after the heat treatment of footpath; The extension property that is heat treatment raising cold-worked material reaches (10D) more than 10, makes material property meet national high-strength fining twisted steel requirement.
6, cold drawing operation significantly improves the strength of materials, and especially yield strength improves, and reaches the high tensile reinforcement requirement;
The reinforcing bar that the application's method production obtains, the product diameter is greater than 20mm, tensile strength is greater than 550 MPas, yield strength is greater than 500 MPas, elongation at break reaches 10% (10D), the peak load percentage elongation is greater than 6%, and (amplitude is 2 σ greater than 2,000,000 times to adopt when carrying out fatigue experiment with supporting nut fatigue strength
A=σ
0* σ
u).
The specific embodiment
Build the cold working heat-treatment production line, diameter ∮ 25mmQ235B coils raw material greatly, and through the rotary barrel unwrapping wire, bent to peeling off, the iron brush treatment makes material surface cleaning.
Twice drawing tube reducing makes material diameter be reduced to ∮ 20mm.
To drawing tube reducing material, carry out active rolling processing, make high precision screw, realize that nut connects.
Rolling rear thread steel are carried out the intermediate frequency temper, adopt 400-500 ℃ of tempering, tempering time is 10-20 minute, makes the material eliminates internal stress improve percentage elongation, and the pinning dislocation improves the strength of materials.Make material property reach specification requirement.
Claims (4)
1, a kind of production method of large-diameter and high-strength finish rolling deformed bar, concrete steps are:
1) selects for use and coil raw material greatly;
2) rotary barrel unwrapping wire promptly adopts the movable plug of diameter 800mm, and the rotation unwrapping wire makes material not have reversing in uncoiling process;
3) material is eliminated rust, alternating bending is peeled off and that material is carried out sedan-chair is straight in this step, uses the iron brush treatment;
4) material is used the drawing die tube reducing, and make the material production special-shaped section;
5) drawing die tube reducing, lubricated then;
6) drawing die tube reducing once more, and, next send into intermediate frequency furnace heat treatment by cold-rolled thread processing, cut scale at last.
2, a kind of production method of high accuracy finish rolling deformed bar as claimed in claim 1, it is characterized by: the raw material of selecting for use of coiling greatly is a ∮ 25mmQ235B reinforcing bar, cold rolling back diameter is reduced to 20mm, and the reinforcing bar tensile strength that production obtains is greater than 550mpa, and yield strength is greater than 500mpa.
3, a kind of living checking method of high accuracy finish rolling deformed bar as claimed in claim 1 is characterized by: it is to take the alternating bending of diameter 350-500mm major diameter roller to peel off that bending is peeled off.
4, a kind of production method of high accuracy finish rolling deformed bar as claimed in claim 1 is characterized by: in the step of sending into the intermediate frequency furnace tempering heat treatment, adopt 400-500 ℃ of tempering, tempering time is 10-20 minute.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA200910143268XA CN101585052A (en) | 2009-05-22 | 2009-05-22 | Large-diameter and high-strength finish rolling deformed bar and its manufacturing technique |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA200910143268XA CN101585052A (en) | 2009-05-22 | 2009-05-22 | Large-diameter and high-strength finish rolling deformed bar and its manufacturing technique |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101585052A true CN101585052A (en) | 2009-11-25 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNA200910143268XA Pending CN101585052A (en) | 2009-05-22 | 2009-05-22 | Large-diameter and high-strength finish rolling deformed bar and its manufacturing technique |
Country Status (1)
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| CN (1) | CN101585052A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102212667A (en) * | 2011-05-05 | 2011-10-12 | 安阳市合力高速冷轧有限公司 | Production process of high-ductility cold-rolled ribbed steel bars |
| CN103639196A (en) * | 2013-12-26 | 2014-03-19 | 安徽工业大学 | Efficient energy-saving manufacturing method for building-used cold rolling twisted steel |
| CN106001109A (en) * | 2016-06-07 | 2016-10-12 | 烟台玄祥五金有限公司 | Production equipment and production method for cold-rolled steel strip |
| CN110421018A (en) * | 2019-07-19 | 2019-11-08 | 江阴市建鑫金属有限公司 | A kind of manufacturing method for the high tenacity welded steel fabric mated formation for bridge |
| CN110523801A (en) * | 2019-09-12 | 2019-12-03 | 何满潮 | The processing technology of NPR steel bar rounding |
-
2009
- 2009-05-22 CN CNA200910143268XA patent/CN101585052A/en active Pending
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102212667A (en) * | 2011-05-05 | 2011-10-12 | 安阳市合力高速冷轧有限公司 | Production process of high-ductility cold-rolled ribbed steel bars |
| CN103639196A (en) * | 2013-12-26 | 2014-03-19 | 安徽工业大学 | Efficient energy-saving manufacturing method for building-used cold rolling twisted steel |
| CN106001109A (en) * | 2016-06-07 | 2016-10-12 | 烟台玄祥五金有限公司 | Production equipment and production method for cold-rolled steel strip |
| CN106001109B (en) * | 2016-06-07 | 2017-10-10 | 烟台玄祥五金有限公司 | The production equipment and preparation method of a kind of cold-rolled strip |
| CN110421018A (en) * | 2019-07-19 | 2019-11-08 | 江阴市建鑫金属有限公司 | A kind of manufacturing method for the high tenacity welded steel fabric mated formation for bridge |
| CN110523801A (en) * | 2019-09-12 | 2019-12-03 | 何满潮 | The processing technology of NPR steel bar rounding |
| CN110523801B (en) * | 2019-09-12 | 2020-11-06 | 何满潮 | Processing technology of NPR steel bar wire rod |
| WO2021047681A1 (en) * | 2019-09-12 | 2021-03-18 | 何满潮 | Processing technology for npr steel bar coil |
| GB2600856A (en) * | 2019-09-12 | 2022-05-11 | He Manchao | Processing technology for NPR steel bar coil |
| GB2600856B (en) * | 2019-09-12 | 2022-11-02 | He Manchao | Processing method of NPR steel rebar coil |
| US11679429B2 (en) | 2019-09-12 | 2023-06-20 | Jing-Jin Electric Technologies Co., Ltd. | Processing method of NPR steel rebar coil |
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Addressee: Yu Zhanquan Document name: the First Notification of an Office Action |
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Open date: 20091125 |