CN101717899A - HRB500E V-N high-strength anti-seismic steel bar and production method thereof - Google Patents
HRB500E V-N high-strength anti-seismic steel bar and production method thereof Download PDFInfo
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- CN101717899A CN101717899A CN200910218248A CN200910218248A CN101717899A CN 101717899 A CN101717899 A CN 101717899A CN 200910218248 A CN200910218248 A CN 200910218248A CN 200910218248 A CN200910218248 A CN 200910218248A CN 101717899 A CN101717899 A CN 101717899A
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Abstract
The invention provides a HRB500E V-N high-strength anti-seismic steel bar and a production method thereof. The HRB500E V-N high-strength anti-seismic steel bar comprises the following chemical components: 0.21-0.25 wt% of C, 0.45-0.65 wt% of Si, 1.35-1.55 wt% of Mn, 0.055-0.070 wt% of V, 0.0145-0.0165 wt% of N, not larger than 0.045 wt% of S, not larger than 0.045 wt% of P, and the balance of Fe and unavoidable impurities. In the invention, through decreasing V and increasing N, and properly controlling initial rolling temperature, finishing rolling temperature, rolling speed, and rolling pass and time, not only a precipitation strengthening effect of the V is fully developed, but also the strength of the steel bar is remarkably improved. Meanwhile, the HRB500E V-N high-strength anti-seismic steel bar maintains favorable plasticity and tenacity with an anti-seismic qualification rate as high as 99.0 percent; cost per ton is reduced by 40-50 yuan RMB compared with that of a V-N microalloying hot rolling process; and the invention is beneficial to the protection and the reasonable utilization of V-N alloy scarce mineral resources, and plays a better promoting role for the popularization and the application of the HRB500E V-N high-strength anti-seismic steel bar.
Description
Technical field
The present invention relates to a kind of low-cost high-strength anti-seismic steel bar and production method thereof, especially a kind of HRB500E V-N high-strength anti-seismic steel bar and hot rolling technology production method thereof belong to metal material processing and field shaping technique.
Background technology
Continuous development and social progress along with urban construction, the building of countries in the world is to large scale development at present, for improving the security of building, the Foreign Architecture industry generally adopts good welding performance, hot rolled ribbed steel bar that intensity is high, adopts 500MPa and above rank reinforcing bar substantially as EU countries, North America.Compare 335MPa, 400MPa rank reinforcing bar, the 500MPa reinforcing bar has the intensity height, the safety margin amount is big, anti-seismic performance good, save superiority such as rolled steel dosage, easy construction, more be applicable to high level, large span and earthquake-resistant building structure, be a kind ofly more save, New Building Materials more efficiently.In order to adapt to the demand of construction industry develop rapidly, accelerate the update of steel for building, more domestic in recent years steel mills have carried out the development of HRB500 high strength cast iron and have applied.Because the high strength cast iron of micro-alloyed hot-rolled explained hereafter has good physicals, reach low strain aging well such as extensibility, bending property, weldability, shock resistance, the technologic mechanics stable performance, need not do too much to adjust to existing steel-making and rolling technology simultaneously, therefore present domestic steel mill produces the HRB500 high strength cast iron and mainly adopts the v n micro alloying hot rolling technology; Because the V/N ratio is apparently higher than desirable stoicheiometry in the steel, and the precipitation precipitating reinforcing effect of vanadium is not fully exerted, cause the partly waste of V resource when adopting this technology; Existing technology is because the VN alloy add-on is more, and cost is higher, has tied up the profit margin of enterprise, is unfavorable for the production of HRB500 V-N high-strength reinforcing bar and applies.
Summary of the invention
For reducing HRB500 V-N high-strength reinforcing bar production cost, promote high-strength hot rolled ribbed steel bar to promote and use better, the invention provides a kind of V-N high-strength anti-seismic steel bar of HRB500E cheaply and production method thereof.
HRB500E V-N high-strength anti-seismic steel bar provided by the invention has the chemical ingredients of following mass content:
C：0.21～0.25wt％、 Si：0.45～0.65wt％、
Mn：1.35～1.55wt％、 V：0.055～0.070wt％、
N：0.0145～0.0165wt％、S≤0.045wt％、P≤0.045wt％，
All the other are Fe and inevitable impurity.
Hot rolling technology provided by the invention is produced the production method of low-cost HRB500E V-N high-strength anti-seismic steel bar, it is the steel billet that steel making working procedure is obtained through falling vanadium nitrogen pick-up, send in the rolling process, through controlling suitable start rolling temperature, finishing temperature, roll speed, rolling pass and time, V (CN) precipitated phase quantity in the steel is increased, size decreases, the precipitation precipitating reinforcing effect of V is not fully exerted, the ferrite crystal grain refinement, thereby steel strength is obviously improved, and when intensity improves, keep the toughness and the plasticity of reinforcing bar constant.
The processing step of production HRB500E V-N high-strength anti-seismic steel bar provided by the invention is as follows:
A, take off the steel billet of row chemical ingredients:
C：0.21～0.25wt％、 Si：0.45～0.65wt％、
Mn：1.35～1.55wt％、 V：0.055～0.070wt％、
N：0.0145～0.0165wt％、S≤0.045wt％
P≤0.045wt%, all the other are Fe and inevitable impurity;
B, the steel billet of A is sent into the soaking zone furnace temperature is in 1120～1180 ℃ the process furnace, heats 70～90 minutes, makes the steel billet start rolling temperature reach 1050～1100 ℃, is 6 passages of roughing under the rolling condition of 0.8～1.3m/s in speed, rolling 50～70 seconds altogether; Be to roll 6 passages, rolling 60～80 seconds altogether under the rolling condition of 3.8～4.5m/s in speed afterwards; Be 2～6 passages of finish rolling under the rolling condition of 7.0～15.0m/s in speed at last, rolling 55～75 seconds altogether, the control finishing temperature was 950～980 ℃;
C, with the finish rolling steel natural air cooling of B step to room temperature, promptly obtain the HRB500E V-N high-strength anti-seismic steel bar, the chemical ingredients of this reinforcing bar is:
C：0.21～0.25wt％、 Si：0.45～0.65wt％、
Mn：1.35～1.55wt％、 V：0.055～0.070wt％、
N：0.0145～0.0165wt％、S≤0.045wt％
P≤0.045wt%, all the other are Fe and inevitable impurity.
Each passage roll speed of described B step and rolling time are looked different size and are required concrete definite.
The steel billet of described B step is that the method for making steel with prior art obtains, and V wherein, N and other chemical composition content add in steelmaking process and control and obtain.
The present invention has following advantage and effect: adopt such scheme, after only needing in steelmaking process, to add an amount of VN alloy and the nitrogenize toughener obtaining required steel billet on a small quantity, again by hot rolling technology control start rolling temperature, finishing temperature, roll speed, can be given full play to precipitation precipitation strength effect and the grain refining effect of V at rolling pass and time, the intensity of reinforcing bar is obviously improved, keep plasticity and toughness preferably simultaneously; The HRB500E high strength cast iron that the present invention produces has the technologic mechanics stable performance, extensibility, weldability, low strain aging preferably, and the antidetonation qualification rate reaches 99.0%; The present invention has adopted and has fallen vanadium nitrogen pick-up technology, compares with existing v n micro alloying hot rolling technology, and the VN alloy add-on reduces, and ton material cost has reduced by 40～50 yuan, remarkable in economical benefits; Vanadium nitrogen microalloy add-on of the present invention obviously reduces, and helps the protection of rare mineral resource and rationally utilizes the Sustainable development of promotion society.The present invention has fundamentally solved existing v n micro alloying hot rolling technology and has produced the production cost height that high strength cast iron exists; enterprise produces and is short of power; output can't mass-producing etc. problem, promoter action has preferably been played in the promotion and application of HRB500E V-N high-strength anti-seismic steel bar.
Embodiment
Below in conjunction with embodiment the present invention is described further.
Embodiment 1
A, take off the steel billet of row chemical ingredients: C:0.21%, Si:0.45%, Mn:1.35%, V:0.055%, N:0.0145%, S:0.018%, P:0.021%, all the other are Fe and inevitable impurity;
B, above-mentioned steel billet is sent into the soaking zone furnace temperature is in 1120 ℃ the process furnace, heats 70 minutes, and making the steel billet start rolling temperature is 1100 ℃, is under the rolling condition of 1.3m/s in speed, to 6 passages of steel billet roughing after the heating, and rolling 50 seconds altogether; Be to roll 6 passages, rolling 60 seconds altogether under the rolling condition of 4.5m/s in speed afterwards; Be 6 passages of finish rolling under the rolling condition of 15.0m/s in speed at last, rolling 55 seconds altogether, the control finishing temperature was 980 ℃;
C, send the cold bed natural air cooling to room temperature the finish rolling steel of B step, promptly obtaining specification is the HRB500E V-N high-strength anti-seismic steel bar of Φ 12mm, the chemical ingredients of this reinforcing bar is: C:0.21%, Si:0.45%, Mn:1.35%, V:0.055%, N:0.0145%, S:0.018%, P:0.021%, all the other are Fe and inevitable impurity.
Embodiment 2
A, take off the steel billet of row chemical ingredients: C:0.25%, Si:0.65%, Mn:1.55%, V:0.070%, N:0.0165%, S:0.015%, P:0.026%, all the other are Fe and inevitable impurity;
B, above-mentioned steel billet is sent into the soaking zone furnace temperature is in 1180 ℃ the process furnace, heats 90 minutes, and making the steel billet start rolling temperature is 1050 ℃, is 6 passages of roughing under the rolling condition of 0.8m/s in speed, rolling 70 seconds altogether; Be to roll 6 passages, rolling 80 seconds altogether under the rolling condition of 3.8m/s in speed afterwards; Be 2 passages of finish rolling under the rolling condition of 7.0m/s in speed at last, rolling 75 seconds altogether, the control finishing temperature was 950 ℃;
C, with cold bed natural air cooling on the finish rolling steel of B step to room temperature, promptly obtaining specification is the HRB500E V-N high-strength anti-seismic steel bar of Φ 32mm, the chemical ingredients of this reinforcing bar is: C:0.25%, Si:0.65%, Mn:1.55%, V:0.070%, N:0.0165%, S:0.015%, P:0.026%, all the other are Fe and inevitable impurity.
Embodiment 3
A, take off the steel billet of row chemical ingredients: C:0.23%, Si:0.52%, Mn:1.45%, V:0.065%, N:0.0155%, S:0.045%, P:0.045%, all the other are Fe and inevitable impurity;
B, above-mentioned steel billet is sent into the soaking zone furnace temperature is in 1160 ℃ the process furnace, heats 80 minutes, and making the steel billet start rolling temperature is 1080 ℃, is 6 passages of roughing under the rolling condition of 1.1m/s in speed, rolling 65 seconds altogether; Be to roll 6 passages, rolling 70 seconds altogether under the rolling condition of 4.0m/s in speed afterwards; Be 4 passages of finish rolling under the rolling condition of 11m/s in speed at last, rolling 65 seconds altogether, the control finishing temperature was 965 ℃;
C, cold bed on the finish rolling steel of B step is carried out natural air cooling to room temperature, promptly obtaining specification is the HRB500E V-N high-strength anti-seismic steel bar of Φ 25mm, the chemical ingredients of this reinforcing bar is: C:0.24%, Si:0.52%, Mn:1.45%, V:0.065%, N:0.0155%, S:0.045%, P:0.045%, all the other are Fe and inevitable impurity.
Claims (3)
1. HRB500E V-N high-strength anti-seismic steel bar is characterized in that having the chemical ingredients of following mass content:
C：0.21～0.25wt％ Si：0.45～0.65wt％、
Mn：1.35～1.55wt％ V：0.055～0.070wt％、
N：0.0145～0.0165wt％ S≤0.045wt％
All the other are Fe and inevitable impurity P≤0.045wt%.
2. production method of HRB500E V-N high-strength anti-seismic steel bar according to claim 1 is characterized in that through following process steps:
A, take off the steel billet of row chemical ingredients:
C：0.21～0.25wt％ Si：0.45～0.65wt％、
Mn：1.35～1.55wt％ V：0.055～0.070wt％、
N：0.0145～0.0165wt％ S≤0.045wt％
All the other are Fe and inevitable impurity P≤0.045wt%;
B, the steel billet of A is sent into the soaking zone furnace temperature is in 1120～1180 ℃ the process furnace, heats 70～90 minutes, and making the steel billet start rolling temperature is 1050～1100 ℃, is 6 passages of roughing under the rolling condition of 0.8～1.3m/s in speed, rolling 50～70 seconds altogether; Be to roll 6 passages, rolling 60～80 seconds altogether under the rolling condition of 3.8～4.5m/s in speed afterwards; Be 2～6 passages of finish rolling under the rolling condition of 7.0～15.0m/s in speed at last, rolling 55～75 seconds altogether, the control finishing temperature was 950～980 ℃;
C, with cold bed natural air cooling on the finish rolling steel of B step to room temperature, receive and promptly to obtain the HRB500E V-N high-strength anti-seismic steel bar, the chemical ingredients of this reinforcing bar is:
C：0.21～0.25wt％ Si：0.45～0.65wt％、
Mn：1.35～1.55wt％ V：0.055～0.070wt％、
N：0.0145～0.0165wt％ S≤0.045wt％
All the other are Fe and inevitable impurity P≤0.045wt%.
3. the production method of HRB500E V-N high-strength anti-seismic steel bar as claimed in claim 2 is characterized in that each the passage roll speed of described B step and rolling time look different size and require specifically to determine.
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102899558A (en) * | 2012-11-16 | 2013-01-30 | 内蒙古包钢钢联股份有限公司 | 500Mpa-grade building aseismic reinforcement |
| CN103469117A (en) * | 2013-08-12 | 2013-12-25 | 武汉钢铁(集团)公司 | Hot-rolled ribbed steel bar having strength-to-yield ratio of 1.25 or more, and production method thereof |
| CN104213018A (en) * | 2014-08-25 | 2014-12-17 | 河北钢铁股份有限公司承德分公司 | 500E Australian standard wire and production method thereof |
| CN104372247A (en) * | 2014-11-04 | 2015-02-25 | 武钢集团昆明钢铁股份有限公司 | 600MPa high-strength antiseismic coil rod twisted steel bar and preparation method thereof |
| CN104593669A (en) * | 2014-12-18 | 2015-05-06 | 马钢(集团)控股有限公司 | Steel for rebar and production method thereof |
| CN104668284A (en) * | 2015-02-03 | 2015-06-03 | 河北钢铁股份有限公司承德分公司 | HRB500E anti-seismic rebar rolling method |
| CN107675078A (en) * | 2017-09-26 | 2018-02-09 | 阳春新钢铁有限责任公司 | The steel of nitrogen containing vanadium and its production method and purposes of a kind of high-yield strength |
| CN109252105A (en) * | 2018-11-23 | 2019-01-22 | 攀钢集团攀枝花钢铁研究院有限公司 | The 500MPa grades of high yield ratio anti-seismic steel bar bars of microalloy containing V and its production method |
| CN110343962A (en) * | 2019-07-26 | 2019-10-18 | 马鞍山钢铁股份有限公司 | A kind of 700Mpa grades or more hot-rolled ribbed high tensile reinforcement steel and its production method |
| CN110951953A (en) * | 2019-12-20 | 2020-04-03 | 福建三宝钢铁有限公司 | HRB500E steel bar and vanadium-nitrogen microalloying process thereof |
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| CN101445894B (en) * | 2008-11-06 | 2011-01-26 | 天津钢铁有限公司 | Large-specification high-intensity steel rod and production process |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102899558A (en) * | 2012-11-16 | 2013-01-30 | 内蒙古包钢钢联股份有限公司 | 500Mpa-grade building aseismic reinforcement |
| CN103469117A (en) * | 2013-08-12 | 2013-12-25 | 武汉钢铁(集团)公司 | Hot-rolled ribbed steel bar having strength-to-yield ratio of 1.25 or more, and production method thereof |
| CN103469117B (en) * | 2013-08-12 | 2016-04-27 | 武汉钢铁(集团)公司 | A kind of hot rolled ribbed steel bar of strong flexor ratio >=1.25 and production method thereof |
| CN104213018A (en) * | 2014-08-25 | 2014-12-17 | 河北钢铁股份有限公司承德分公司 | 500E Australian standard wire and production method thereof |
| CN104372247A (en) * | 2014-11-04 | 2015-02-25 | 武钢集团昆明钢铁股份有限公司 | 600MPa high-strength antiseismic coil rod twisted steel bar and preparation method thereof |
| CN104593669A (en) * | 2014-12-18 | 2015-05-06 | 马钢(集团)控股有限公司 | Steel for rebar and production method thereof |
| CN104668284A (en) * | 2015-02-03 | 2015-06-03 | 河北钢铁股份有限公司承德分公司 | HRB500E anti-seismic rebar rolling method |
| CN107675078A (en) * | 2017-09-26 | 2018-02-09 | 阳春新钢铁有限责任公司 | The steel of nitrogen containing vanadium and its production method and purposes of a kind of high-yield strength |
| CN109252105A (en) * | 2018-11-23 | 2019-01-22 | 攀钢集团攀枝花钢铁研究院有限公司 | The 500MPa grades of high yield ratio anti-seismic steel bar bars of microalloy containing V and its production method |
| CN110343962A (en) * | 2019-07-26 | 2019-10-18 | 马鞍山钢铁股份有限公司 | A kind of 700Mpa grades or more hot-rolled ribbed high tensile reinforcement steel and its production method |
| CN110951953A (en) * | 2019-12-20 | 2020-04-03 | 福建三宝钢铁有限公司 | HRB500E steel bar and vanadium-nitrogen microalloying process thereof |
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