CN102345052A - Production method of HRB400 (Hazardous Review Board 400) reinforcing steel bar - Google Patents
Production method of HRB400 (Hazardous Review Board 400) reinforcing steel bar Download PDFInfo
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- CN102345052A CN102345052A CN2011103390602A CN201110339060A CN102345052A CN 102345052 A CN102345052 A CN 102345052A CN 2011103390602 A CN2011103390602 A CN 2011103390602A CN 201110339060 A CN201110339060 A CN 201110339060A CN 102345052 A CN102345052 A CN 102345052A
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Abstract
The invention discloses a production method of HRB400 (Hazardous Review Board 400) reinforcing steel bar. In the production method, a steel product used for rolling comprises the following components in percentage by weight: 0.18-1.24% of C, 0.30-0.55% of Si, 1.30-1.55% of Mn, 0.010-0.030% of V, not more than 0.040% of P, not more than 0.040% of S, not more than 0.022% of Cr, not more than 0.020% of Ni, not more than 0.022% of Cu and the balance of Fe and inevitable impurities. The initial rolling temperature is 980-1,030 DEG C, the final rolling temperature is 750-900 DEG C; after being rolled, the reinforcing steel bar is naturally cooled. According to the production method of the HRB400 reinforcing steel bar, the initial rolling temperature requires less on a device and the added V amount is small.
Description
Technical field
The invention belongs to the stress metal manufacture field, specifically, relate to a kind of working method of HRB400 reinforcing bar.
Background technology
Along with building to reinforcing bar require increasingly highly, the HRB400 reinforcing bar with excellent ys and tensile strength has become the leading reinforcing bar of house, brutal and road.
At present, usually in 20MnSi, add certain alloying elements such as V, Nb and Ti and carry out microalloying and produce the HRB400 reinforcing bar, to improve the mechanical property of steel.For the production of HRB400 reinforcing bar, main at present employing ordinary hot roll process is produced, and such hot rolling technology makes that HRB400 reinforcing bar production cost is too high because the amount of the alloying elements such as V, Nb and Ti that use is excessive.
For the production of HRB400 reinforcing bar, studying more recently is low temperature rolling technology, and the start rolling temperature general requirement of low temperature rolling technology is below 950 ℃.When adopting low temperature rolling technology, because the deformation of steel drag increases under the low temperature, thus very high to the requirement of steel rolling equipment, therefore, be difficult to realize.
Summary of the invention
The objective of the invention is to overcome the deficiency of prior art, and a kind of working method of novel HRB400 reinforcing bar is provided.
The working method of HRB400 reinforcing bar of the present invention; The steel of rolling employing comprise C, 0.30%～0.55% Si, 1.30%～1.55% Mn, 0.010%～0.030% V, the P smaller or equal to 0.040%, the S smaller or equal to 0.040%, the Cr smaller or equal to 0.022%, the Ni smaller or equal to 0.020% of 0.18%-0.24% and by weight percentage smaller or equal to 0.022% Cu; Surplus is iron and unavoidable impurities; Start rolling temperature is 980 ℃～1030 ℃; Finishing temperature is 750 ℃～900 ℃, and naturally cooling is adopted in rolling back.
According to exemplary embodiment of the present invention, the steel of rolling employing can comprise 0.020% V by weight percentage.
According to exemplary embodiment of the present invention, start rolling temperature can be 1000 ℃.
According to exemplary embodiment of the present invention, in the operation of rolling, the finish rolling deflection of steel can be 30%～60%.
According to the working method of HRB400 reinforcing bar of the present invention, start rolling temperature requires V amount low and that add low to equipment, and therefore, the working method of HRB400 reinforcing bar of the present invention can economize on resources, reduce cost.
Description of drawings
The following description of the exemplary embodiment of carrying out in conjunction with the drawings, these and/or other aspect of the present invention and advantage will become clear and be easier to and understand, wherein:
Fig. 1 is the metallographic structure figure of the HRB400 reinforcing bar produced of the working method of HRB400 reinforcing bar according to an exemplary embodiment of the present invention.
Embodiment
Describe the present invention in detail with specific embodiment below with reference to accompanying drawings.
The working method of HRB400 reinforcing bar according to an exemplary embodiment of the present invention; The steel that in the operation of rolling, adopt comprise C, 0.30%～0.55% Si, 1.30%～1.55% Mn, 0.010%～0.030% V, the P smaller or equal to 0.040%, the S smaller or equal to 0.040%, the Cr smaller or equal to 0.022%, the Ni smaller or equal to 0.020% of 0.18%-0.24% by weight percentage and smaller or equal to 0.022% Cu, surplus is iron and unavoidable impurities.
At present, adopting V microalloying technology to produce in the existing technology of HRB400 reinforcing bar, according to the V of the unusual adding 0.03%～0.12% of HRB400 specification.The steel of the working method of HRB400 reinforcing bar employing comprise 0.010%～0.030% V according to an exemplary embodiment of the present invention, preferably comprise 0.020% V, have reduced the add-on of V widely, therefore practiced thrift resource, reduced cost.According to exemplary embodiment of the present invention, the V of adding can improve the ys of HRB400 reinforcing bar.Wherein, V combines with C, N in the steel to generate V (CN) compound, plays the precipitation strength effect.
According to exemplary embodiment of the present invention, can on the chemical ingredients basis of HRB335 reinforcing bar, add 0.010%～0.030% V and come the steel that adopt in the production operation of rolling, but the invention is not restricted to this.
The working method of HRB400 reinforcing bar is according to an exemplary embodiment of the present invention: the steel to comprising above-mentioned chemical ingredients are rolled, and start rolling temperature is 980 ℃～1030 ℃, and finishing temperature is 750 ℃～900 ℃, and naturally cooling is adopted in rolling back.
Specifically,, can adopt 980 ℃～1030 ℃ start rolling temperature, preferably can adopt 1000 ℃ start rolling temperature according to exemplary embodiment of the present invention.This start rolling temperature is higher than the start rolling temperature below 950 ℃ that the low temperature rolling of prior art requires, and is lower than 1050 ℃～1100 ℃ start rolling temperature of the common rolling requirement of prior art.According to the present invention,,, help the grain refining in the follow-up operation of rolling so can avoid austenite crystal too thick because 980 ℃～1030 ℃ start rolling temperature is relatively low.In addition, general steel rolling equipment all can satisfy the requirement of 980 ℃ according to an exemplary embodiment of the present invention～1030 ℃ start rolling temperature.
The working method of HRB400 reinforcing bar according to an exemplary embodiment of the present invention can be controlled at finishing temperature in 750 ℃～900 ℃ the scope.According to exemplary embodiment of the present invention, can finishing temperature be controlled in 750 ℃～900 ℃ the scope through the cooling between the roll housing.In this finishing temperature scope, can guarantee that the non-recrystallization distortion takes place steel during finishing stand rolling, thus further crystal grain thinning.Specification according to the HRB400 reinforcing bar of producing is different, and the finish rolling deflection of steel (that is non-recrystallization cumulative deformation) can be 30%～60%.
According to exemplary embodiment of the present invention, reinforcing bar is adopted naturally cooling in rolling back.For example, cold bed carries out naturally cooling on the reinforcing bar making after the finish rolling.Because it is cold not wear water control after rolling, the speed of cooling of reinforcing bar is slow and evenly, thus can not produce tempered martensite and sorbite tissue, but generation perlite+ferritic structure.
Working method according to HRB400 reinforcing bar of the present invention; The low temperature finish rolling of adopting can refine austenite crystal grain; And in rolling back naturally cooling make homogeneous microstructure, the rebar surface quality is good, resistance to corrosion is strong, and the tissue that influence such as tempered martensite is used can not occur.
To combine concrete embodiment to come to describe in further detail the present invention below.
Embodiment 1
The steel that employing has the composition of embodiment 1 in the table 1 are produced the HRB400 reinforcing bar of Φ 28mm, and wherein, the unit of each constituent content is weight percentage in the table 1.
Steel are rolled, and start rolling temperature is 1000 ℃, through 6 passage roughing distortion, rolls distortion in 6 passages, 2 passage finish rolling distortion, and the last pass deflection is 36%, finishing temperature is 840 ℃.The cold bed naturally cooling is gone up in rolling back, and last cold bed temperature is 830 ℃.
The mechanical property of the HRB400 reinforcing bar of producing through the working method of embodiment 1 is as shown in table 2.
Embodiment 2
The steel that employing has the composition of embodiment 2 in the table 1 are produced the HRB400 reinforcing bar of Φ 25mm.
Steel are rolled, and start rolling temperature is 1025 ℃, through 6 passage roughing distortion, rolls distortion in 6 passages, 4 passage finish rolling distortion, and deflection is 58.9%, finishing temperature is 860 ℃.The cold bed naturally cooling is gone up in rolling back, and last cold bed temperature is 820 ℃.
The mechanical property of the HRB400 reinforcing bar of producing through the working method of embodiment 2 is as shown in table 2.
Embodiment 3
The steel that employing has the composition of embodiment 3 in the table 1 are produced the HRB400 reinforcing bar of Φ 32mm.
Steel are rolled, and start rolling temperature is 985 ℃, through 6 passage roughing distortion, rolls distortion in 6 passages, 2 passage finish rolling distortion, and deflection is 32.54%, finishing temperature is 780 ℃.The cold bed naturally cooling is gone up in rolling back, and last cold bed temperature is 810 ℃.
The mechanical property of the HRB400 reinforcing bar of producing through the working method of embodiment 3 is as shown in table 2.
Table 1
Table 2
| Ys (Mpa) | Tensile strength (Mpa) | Unit elongation (%) | Clod wash | |
| Embodiment 1 | 425 | ?585 | 22 | Qualified |
| Embodiment 2 | 445 | ?595 | 20 | Qualified |
| Embodiment 3 | 460 | ?610 | 18 | Qualified |
Can find out to have excellent ys, tensile strength and unit elongation through the HRB400 reinforcing bar of producing according to the embodiment of the invention through above each embodiment.
Fig. 1 is the metallographic structure figure of the HRB400 reinforcing bar produced of the working method of HRB400 reinforcing bar according to an exemplary embodiment of the present invention.Can find out through Fig. 1, the HRB400 reinforcing bar of producing according to an exemplary embodiment of the present be organized as perlite+ferritic, in addition, crystal size is 8.5～9 grades.
Above description through to exemplary embodiment of the present can be found out; Require V amount low and that add low according to the start rolling temperature of the working method of HRB400 reinforcing bar of the present invention to equipment; The mechanical property of the HRB400 reinforcing bar of producing according to the working method of HRB400 reinforcing bar of the present invention in addition, is excellent.
Claims (4)
1. the working method of a HRB400 reinforcing bar is characterized in that,
The steel of rolling employing comprise C, 0.30%～0.55% Si, 1.30%～1.55% Mn, 0.010%～0.030% V, the P smaller or equal to 0.040%, the S smaller or equal to 0.040%, the Cr smaller or equal to 0.022%, the Ni smaller or equal to 0.020% of 0.18%-0.24% and by weight percentage smaller or equal to 0.022% Cu; Surplus is iron and unavoidable impurities
Start rolling temperature is 980 ℃～1030 ℃,
Finishing temperature is 750 ℃～900 ℃,
Naturally cooling is adopted in rolling back.
2. the working method of HRB400 reinforcing bar as claimed in claim 1 is characterized in that, the steel of rolling employing comprise 0.020% V by weight percentage.
3. the working method of HRB400 reinforcing bar as claimed in claim 1 is characterized in that, start rolling temperature is 1000 ℃.
4. the working method of HRB400 reinforcing bar as claimed in claim 1 is characterized in that, in the operation of rolling, the finish rolling deflection of steel is 30%～60%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN2011103390602A CN102345052A (en) | 2011-11-01 | 2011-11-01 | Production method of HRB400 (Hazardous Review Board 400) reinforcing steel bar |
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| CN2011103390602A CN102345052A (en) | 2011-11-01 | 2011-11-01 | Production method of HRB400 (Hazardous Review Board 400) reinforcing steel bar |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102989763A (en) * | 2012-11-26 | 2013-03-27 | 首钢总公司 | Production method of four-segment high-strength aseismic reinforcement |
| CN104357741A (en) * | 2014-11-18 | 2015-02-18 | 陕西钢铁集团有限公司 | HRB400E high-strength aseismic coiled reinforced bar and production method thereof |
| CN104388840A (en) * | 2014-11-18 | 2015-03-04 | 陕西钢铁集团有限公司 | HRB400E high-strength aseismic reinforcement and production method thereof |
| CN105088053A (en) * | 2014-05-20 | 2015-11-25 | 新兴铸管新疆有限公司 | Novel process for smelting HRB400E steel material |
| CN109097690A (en) * | 2018-09-14 | 2018-12-28 | 柳州钢铁股份有限公司 | The production method of HRB400 reinforcing bar used for high-speed railway |
| CN114875205A (en) * | 2022-05-27 | 2022-08-09 | 广西柳州钢铁集团有限公司 | Non-microalloy HRB400E hot-rolled ribbed steel bar ordinary-speed bar and production method thereof |
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| CN101289732A (en) * | 2008-06-18 | 2008-10-22 | 武钢集团昆明钢铁股份有限公司 | Fine grain hot-rolled ribbed bar and method for preparing same |
| CN101417293A (en) * | 2007-10-26 | 2009-04-29 | 首钢总公司 | HRB 400 steel bar production method |
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2011
- 2011-11-01 CN CN2011103390602A patent/CN102345052A/en active Pending
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| JPH093537A (en) * | 1995-06-19 | 1997-01-07 | Kobe Steel Ltd | Production of accelerated cooling type steel plate excellent in uniformity of material in steel plate |
| US20020192012A1 (en) * | 2000-04-24 | 2002-12-19 | Tatsumi Kimura | Linear shape steel excellent in joint fatigue characteristics and production method therefor |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102989763A (en) * | 2012-11-26 | 2013-03-27 | 首钢总公司 | Production method of four-segment high-strength aseismic reinforcement |
| CN105088053A (en) * | 2014-05-20 | 2015-11-25 | 新兴铸管新疆有限公司 | Novel process for smelting HRB400E steel material |
| CN104357741A (en) * | 2014-11-18 | 2015-02-18 | 陕西钢铁集团有限公司 | HRB400E high-strength aseismic coiled reinforced bar and production method thereof |
| CN104388840A (en) * | 2014-11-18 | 2015-03-04 | 陕西钢铁集团有限公司 | HRB400E high-strength aseismic reinforcement and production method thereof |
| CN109097690A (en) * | 2018-09-14 | 2018-12-28 | 柳州钢铁股份有限公司 | The production method of HRB400 reinforcing bar used for high-speed railway |
| CN109097690B (en) * | 2018-09-14 | 2020-09-01 | 柳州钢铁股份有限公司 | Production method of HRB400 steel bar for high-speed railway |
| CN114875205A (en) * | 2022-05-27 | 2022-08-09 | 广西柳州钢铁集团有限公司 | Non-microalloy HRB400E hot-rolled ribbed steel bar ordinary-speed bar and production method thereof |
| CN114875205B (en) * | 2022-05-27 | 2024-03-26 | 广西柳州钢铁集团有限公司 | Non-microalloy HRB400E hot rolled ribbed bar and production method thereof |
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Application publication date: 20120208 |