CN101701314A - Steel bar for high-strength stirrup and preparation method thereof - Google Patents
Steel bar for high-strength stirrup and preparation method thereof Download PDFInfo
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- CN101701314A CN101701314A CN200910213577A CN200910213577A CN101701314A CN 101701314 A CN101701314 A CN 101701314A CN 200910213577 A CN200910213577 A CN 200910213577A CN 200910213577 A CN200910213577 A CN 200910213577A CN 101701314 A CN101701314 A CN 101701314A
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Abstract
The invention discloses a steel bar for a high-strength stirrup and a preparation method thereof, and the steel bar comprises the following chemical components by weight: 0.1-0.13% of C, 1-1.5% of Si, 0.8-1.2% of Mn and the balance of iron and inevitable impurities. The preparation method comprises the following steps: drawing a hot-rolled wire rod, then sending into a heating furnace for heating, heating the hot-rolled wire rod to the quenching temperature of 950-1050 DEG C at the heating speed of 200-500 DEG C/S, and keeping the temperature for 3-5 minutes; carrying out water cooling at the cooling temperature of more than 1000 DEG C/S; further heating to the tempering temperature of 400-600 DEG C after the water cooling, keeping the temperature for 3-5 minutes, and carrying out the water cooling at the cooling speed of more than 500 DEG C/S again. A product adopts Si, Mn and other alloy elements with lower cost, which can not only meet certain hardenability and be applicable to the quenching technology and the tempering technology, but also ensure the good strength-price ratio.
Description
Technical field
The present invention relates to a kind of reinforcing bar product, relate in particular to steel bar for high-strength stirrup in a kind of skeleton construction, the invention still further relates to the preparation method of this reinforcing bar.
Background technology
Safe earthquake-proof and resources conservation are the important development directions of structural steel, the high-performance steel become the focus of various countries' research already, China is in industrialization and urbanization fast-developing period at present, cities and towns dwelling house, public building, infrastructure construction have obtained fast development, because the infrastructure construction of China is a main raw material with reinforcing bar and concrete mostly, the year usage quantity of building bar and wire rod has surpassed 1.5 hundred million tons.The general intensity of these steel is on the low side, and steel using amount is big, has caused the significant wastage of resource.
High strength cast iron is except that having certain intensity (800～1200MPa), also should have certain plasticity, guaranteeing that applied member has certain ductility and security, therefore require reinforcing bar elongation after fracture A at percentage of total elongation Agt more than 12.0%, under the maximum, force more than 4.0%.During as restriction hoop, reinforcing bar need carry out that crotch is handled or welding, therefore requires its bending property good, knee flawless (radius of curvature R is 3 times of reinforcing bar nominal diameter) after crooked 180 °, and the carbon equivalent of reinforcing bar can guarantee good welding property below 5.0%.The high reinforcement is the developing direction of ferrous materials, and the above high strength cast iron of 800MPa level has great application prospect in fields such as building, road and bridge, but China can't pass through the hot-rolling method direct production.
Summary of the invention
Goal of the invention is to provide a kind of tension, yield strength height, unit elongation height, the hoop for rods for reinforcing of good bending property.
Another object of the present invention is to provide the preparation method of this steel bar for high-strength stirrup.
Technical scheme: in order to realize above first purpose, a kind of steel bar for high-strength stirrup of the present invention has following chemical components: C:0.1～0.13wt%, Si:1～1.5wt%, Mn:0.8～1.2wt%, its surplus is iron and unavoidable impurities.
In order to realize another above purpose, the preparation method of a kind of steel bar for high-strength stirrup of the present invention, with chemical ingredients is C:0.1～0.13wt%, Si:1～1.5wt%, Mn:0.8～1.2wt%, its surplus is the gren rod of iron and unavoidable impurities, handles through following steps:
A, with gren rod behind drawing forming, send in the process furnace and heat, being 200～500 ℃/S with rate of heating is heated to 950～1050 ℃ quenching temperature with described gren rod, is incubated 3～5 minutes;
B, again with the speed water-cooled of speed of cooling greater than 1000 ℃/S;
The tempering temperature of reheat to 400 after C, the water-cooled～600 ℃ is incubated 3～5 minutes, with speed of cooling greater than the speed of 500 ℃/S water-cooled again.
In the above-mentioned steps, rate of heating is preferably 400～500 ℃/S in the steps A, is heated to 1000 ℃; Be preferably after the water-cooled among the step C and be heated to 500 ℃.
For make reinforcement property better, before the gren rod drawing forming, gren rod is carried out processing of rust removing.
After the water-cooled of step C, the gren rod that obtains is sheared, again rewinding one-tenth dish.
Beneficial effect:
1, product of the present invention does not adopt microalloy series such as Nb, V, Ti, and lower-cost alloying elements such as selection Si, Mn had both satisfied certain through hardening, hardenability, were fit to quench, tempered technology, can guarantee good intensity price ratio again;
2, product reinforcing bar nominal diameter of the present invention is 5.0～11.0mm, tensile strength R
m900～1350Mpa, regulation disproportional extension strength R
P0.2800～1200Mpa, elongation after fracture A be more than 12.0%, percentage of total elongation A under the maximum, force
GtMore than 4.0%, knee flawless (radius of curvature R is 3 times of reinforcing bar nominal diameter) after crooked 180 °;
3, the present invention adjusts material chemical component, determines processing parameters such as heat-eliminating medium, each heat treatment step temperature range, soaking time, ferrite content is suitably improved, the ductility of reinforcing steel bar; Reduce the material carbon equivalent, guarantee good weldability;
4, the present invention adjusts quenching, tempering heat treatment process and parameter, and crystal grain thinning in the soft phase content of control makes that elongation Agt is stabilized in more than 4.0% under the maximum, force of high strength cast iron, and elongation after fracture A is more than 12.0%.
Embodiment:
Below in conjunction with the drawings and specific embodiments, further illustrate the present patent application, should understand these embodiment only be used to the present patent application is described and be not used in the restriction the present patent application scope, after having read the present patent application, those skilled in the art all fall within the application's claims institute restricted portion to the modification of the various equivalent form of values of the present patent application.
Embodiment 1
A kind of steel bar for high-strength stirrup, form by following chemical components:
C：0.1wt％ Si：1wt％ Mn：0.8wt％
Its surplus is iron and unavoidable impurities.
The preparation method of above-mentioned steel bar for high-strength stirrup:
With chemical ingredients be: C:0.1wt%Si:1wt%Mn:0.8wt%,
Its surplus is the gren rod of iron and unavoidable impurities, handles through following steps:
A, with after the gren rod rust cleaning, through drawing forming, send in the process furnace and heat, being 200 ℃/S with rate of heating is heated to 950 ℃ quenching temperature with described gren rod, is incubated 3 minutes;
B, again with the speed water-cooled of speed of cooling greater than 1000 ℃/S;
The tempering temperature of reheat to 400 ℃ is incubated 3 minutes after C, the water-cooled, with speed of cooling greater than the speed of 500 ℃/S water-cooled again.
D, the gren rod that obtains is sheared, again rewinding one-tenth dish.
Embodiment 2
A kind of steel bar for high-strength stirrup, form by following chemical components:
C：0.13wt％ Si：1.5wt％
Mn：1.2wt％
Its surplus is iron and unavoidable impurities.
The preparation method of above-mentioned steel bar for high-strength stirrup:
With chemical ingredients be: C:0.13wt% Si:1.5wt% Mn:1.2wt%,
Its surplus is the gren rod of iron and unavoidable impurities, handles through following steps:
A, with after the gren rod rust cleaning, through drawing forming, send in the process furnace and heat, being 500 ℃/S with rate of heating is heated to 1050 ℃ quenching temperature with described gren rod, is incubated 5 minutes;
B, again with the speed water-cooled of speed of cooling greater than 1000 ℃/S;
The tempering temperature of reheat to 600 ℃ is incubated 5 minutes after C, the water-cooled, with speed of cooling greater than the speed of 500 ℃/S water-cooled again.
D, the gren rod that obtains is sheared, again rewinding one-tenth dish.
Embodiment 3
A kind of steel bar for high-strength stirrup, form by following chemical components:
C：0.12wt％ Si：1.2wt％ Mn：1wt％
Its surplus is iron and unavoidable impurities.
The preparation method of above-mentioned steel bar for high-strength stirrup:
With chemical ingredients be: C:0.12wt% Si:1.2wt% Mn:1wt%,
Its surplus is the gren rod of iron and unavoidable impurities, handles through following steps:
A, with after the gren rod rust cleaning, through drawing forming, send in the process furnace and heat, being 400 ℃/S with rate of heating is heated to 1000 ℃ quenching temperature with described gren rod, is incubated 4 minutes;
B, again with the speed water-cooled of speed of cooling greater than 1000 ℃/S;
The tempering temperature of reheat to 500 ℃ is incubated 4 minutes after C, the water-cooled, with speed of cooling greater than the speed of 500 ℃/S water-cooled again.
D, the gren rod that obtains is sheared, again rewinding one-tenth dish.
Claims (5)
1. steel bar for high-strength stirrup is characterized in that having following chemical components: C:0.1～0.13wt%, and Si:1～1.5wt%, Mn:0.8～1.2wt%, its surplus is iron and unavoidable impurities.
2. the preparation method of steel bar for high-strength stirrup according to claim 1, it is characterized in that with chemical ingredients be C:0.1～0.13wt%, Si:1～1.5wt%, Mn:0.8～1.2wt%, its surplus is the gren rod of iron and unavoidable impurities, handles through following steps:
A, with gren rod behind drawing forming, send in the process furnace and heat, being 200～500 ℃/S with rate of heating is heated to 950～1050 ℃ quenching temperature with described gren rod, is incubated 3～5 minutes;
B, again with the speed water-cooled of speed of cooling greater than 1000 ℃/S;
The tempering temperature of reheat to 400 after C, the water-cooled～600 ℃ is incubated 3～5 minutes, with speed of cooling greater than the speed of 500 ℃/S water-cooled again.
3. the preparation method of steel bar for high-strength stirrup according to claim 2, it is characterized in that: rate of heating is 400～500 ℃/S in the steps A, is heated to 1000 ℃; Water-cooled post-heating to 500 ℃ among the step C.
4. the preparation method of steel bar for high-strength stirrup according to claim 2 is characterized in that: before the gren rod drawing forming, gren rod is carried out processing of rust removing.
5. the preparation method of steel bar for high-strength stirrup according to claim 2 is characterized in that: after the water-cooled of step C, the gren rod that obtains is sheared, rewinding one-tenth dish again.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910213577A CN101701314A (en) | 2009-11-06 | 2009-11-06 | Steel bar for high-strength stirrup and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910213577A CN101701314A (en) | 2009-11-06 | 2009-11-06 | Steel bar for high-strength stirrup and preparation method thereof |
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| CN101701314A true CN101701314A (en) | 2010-05-05 |
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| CN200910213577A Pending CN101701314A (en) | 2009-11-06 | 2009-11-06 | Steel bar for high-strength stirrup and preparation method thereof |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102121082A (en) * | 2011-01-31 | 2011-07-13 | 中国钢研科技集团有限公司 | Production method of reinforcing steel bar used as stirrup |
| CN102864374A (en) * | 2012-08-15 | 2013-01-09 | 安阳龙腾特钢制造有限公司 | Low-yield ratio and high-strength stirrup provided with bainite structure and used for buildings and production process |
| CN102925651A (en) * | 2012-10-26 | 2013-02-13 | 江苏天舜金属材料集团有限公司 | Heat treatment processing method for high-speed production of small-diameter, high-strength and high-plasticity steel |
| CN103671440A (en) * | 2013-11-22 | 2014-03-26 | 江苏天舜金属材料集团有限公司 | Midair multipoint vertical steel bar connecting joint and construction method thereof |
| CN104047428A (en) * | 2014-06-16 | 2014-09-17 | 南华大学 | Method for enhancing ductility of high-strength concrete pier stud |
| CN104762550A (en) * | 2015-04-10 | 2015-07-08 | 唐山曹妃甸区通鑫再生资源回收利用有限公司 | Hot-press molding process for hot-press briquette |
| CN106048173A (en) * | 2016-07-20 | 2016-10-26 | 柳州科尔特锻造机械有限公司 | Heat treatment method for alloy steel |
-
2009
- 2009-11-06 CN CN200910213577A patent/CN101701314A/en active Pending
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102121082A (en) * | 2011-01-31 | 2011-07-13 | 中国钢研科技集团有限公司 | Production method of reinforcing steel bar used as stirrup |
| CN102864374A (en) * | 2012-08-15 | 2013-01-09 | 安阳龙腾特钢制造有限公司 | Low-yield ratio and high-strength stirrup provided with bainite structure and used for buildings and production process |
| CN102864374B (en) * | 2012-08-15 | 2015-02-25 | 安阳龙腾特钢制造有限公司 | Low-yield ratio and high-strength stirrup provided with bainite structure and used for buildings and production process |
| CN102925651A (en) * | 2012-10-26 | 2013-02-13 | 江苏天舜金属材料集团有限公司 | Heat treatment processing method for high-speed production of small-diameter, high-strength and high-plasticity steel |
| CN102925651B (en) * | 2012-10-26 | 2014-12-17 | 江苏天舜金属材料集团有限公司 | Heat treatment processing method for high-speed production of small-diameter, high-strength and high-plasticity steel |
| CN103671440A (en) * | 2013-11-22 | 2014-03-26 | 江苏天舜金属材料集团有限公司 | Midair multipoint vertical steel bar connecting joint and construction method thereof |
| CN103671440B (en) * | 2013-11-22 | 2015-10-28 | 江苏天舜金属材料集团有限公司 | A kind of aerial vertical steel bar connecting joints of multiple spot and method of construction thereof |
| CN104047428A (en) * | 2014-06-16 | 2014-09-17 | 南华大学 | Method for enhancing ductility of high-strength concrete pier stud |
| CN104762550A (en) * | 2015-04-10 | 2015-07-08 | 唐山曹妃甸区通鑫再生资源回收利用有限公司 | Hot-press molding process for hot-press briquette |
| CN106048173A (en) * | 2016-07-20 | 2016-10-26 | 柳州科尔特锻造机械有限公司 | Heat treatment method for alloy steel |
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Open date: 20100505 |