CN103639196B - A kind of production method of energy-saving building cold-rolled threaded reinforcing steel - Google Patents
A kind of production method of energy-saving building cold-rolled threaded reinforcing steel Download PDFInfo
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- CN103639196B CN103639196B CN201310731876.9A CN201310731876A CN103639196B CN 103639196 B CN103639196 B CN 103639196B CN 201310731876 A CN201310731876 A CN 201310731876A CN 103639196 B CN103639196 B CN 103639196B
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Abstract
The invention provides the production method of a kind of high-efficiency and energy-saving type cold-rolled threaded reinforcing steel for building, belong to construction(al)steel technical field.The present invention is by controlling bending roll roller footpath, quantity, the mutual alignment of bending roll and driven roll, drive roll, complete the large deformation of mechanical descaling and cold-rolled process and evenly extend, realize the entirety strengthening of spiral section, reducing to roll rear residual stress, reaching by rolling rear online K cryogenic treatment the object improved material impact toughness, keep intensity after cold deformation.The tensile strength of two rib spirals that this production method obtains is not less than 650MPa, and the stress relaxation rate that fracture elongation is not less than under 8%, 450MPa and 1000h is not more than 8%.
Description
Technical field
The invention belongs to construction(al)steel technical field, be specifically related to the production technology of a kind of energy-saving building Q235 steel cold rolling pair of rib spiral.
Background technology
Along with the fast development of Chinese national economy, building had become one of consumed resource larger row industry already.According to statistics, Building Trade in China steel using amount accounts for about 50% of steel consumption total amount.Realize sustainable development, just must adjust construction material consumption s tructure, apply high tensile reinforcement energetically, walk efficient resource efficient development strategy.Country's " steel industry adjustment and development planning " requires to give priority to high strength, high-elongation construction(al)steel, the Technology design specification that amendment is relevant, accelerate to eliminate the following screw-thread steel of II level, force the screw-thread steel applying more than III level, to reduce a large amount of uses of rare metal in screw-thread steel for building, improve the utilization rate of resource and the energy, realize material-saving, energy-saving and environmental protection and sustainable development.So, development low cost, low consumed high-effect economizing type construction(al)steel, further accelerate construction(al)steel kind high quality and update paces very urgent.
Patent 200810233733,200810124722,200810124723 and 201010183312 is proposed the production method of high strength cast iron, but be characterized in all have employed hot rolling, raw material contain Mn, Si, even adopt B, V, Ti of certain content to carry out Alloying Treatment, the intensity rank of reinforcing bar is HRB500; Although patent 200610125347 proposes the production method of the higher high-strength hot rolled reinforced bar of intensity, raw material with the addition of a large amount of alloying element V, Cr, Mo, Ni etc. on the basis of 20MnSi; Patent 200910143268 proposes a kind of production method of large-diameter and high-strength finish rolling deformed bar, adopt raw material to be Q235B, but the tensile strength that can reach is 550MPa.
Summary of the invention
For overcoming the deficiencies in the prior art, the invention provides a kind of production method of energy-saving building cold-rolled threaded reinforcing steel, the method makes rolled piece cross section different parts realize longitudinally evenly extensional, reduce the residual stress that inhomogeneous deformation causes, reduce and roll after-baking temperature, make cold-rolled threaded reinforcing steel toughness the high strength keeping work hardening to bring while have also been obtained improvement.
In order to solve above technical problem, the present invention is achieved by the following technical programs.
The invention provides a kind of production method of energy-saving building cold-rolled threaded reinforcing steel, comprise the work hardening technique of bending descaling process, cold roller and deformed process, also comprise and evenly extend reinforcement process, this technique by controlling the diameter of bending roll, quantity, orientation accomplish to cooperatively interact with cold roller and deformed, the horizontal each position of section of rolled piece is made to realize longitudinally evenly extensional, reduce the residual stress that inhomogeneous deformation causes, reducing and roll after-baking temperature, reaching by rolling rear online K cryogenic treatment the object improved reinforcing bar impact flexibility, keep intensity after cold deformation.
Further, the working diameter of described bending roll is 120 ~ 125mm, and its quantity is set to 4, ensures that de-scaling BENDING PROCESS order realizes forward and the back-flexing of circle base; Described 4 bending rolls (1,2,3,4) are along rolling centerline " one " word arrangement, bending roll center line is vertical with rolling centerline, with the 2nd frame driving rollers (10) centerline parallel, extensional and rolling deformation are matched, ensures the even extensional of steel bar overall.
Further, the working diameter of described bending roll is 120 ~ 125mm, and its quantity is set to 4, ensures that de-scaling BENDING PROCESS order realizes forward and the back-flexing of circle base; The center line of described bending roll (5,8) is vertical with rolling centerline, with the 2nd frame driving rollers (10) centerline parallel, bent intermediate roller (6,7) center line and rolling center line parallel, extensional and rolling deformation are matched, ensures the even extensional of steel bar overall.
Compared with prior art, the present invention has following technique effect:
1, the present invention makes rolled piece cross section different parts realize longitudinally evenly extensional, the logarithmic strain difference of round steel cross section different parts extensional is less than 0.1, reduce the residual stress that inhomogeneous deformation causes, reduce and roll after-baking temperature (not higher than 350 DEG C), toughness is improved while, better maintain the high strength that work hardening brings, reach the object improving reinforcing bar comprehensive mechanical performance.
2, through the cold-rolled ribbed screw-thread steel of Q235 that technology of the present invention is produced, its tensile strength is not less than 650MPa, and the stress relaxation rate that fracture elongation is not less than under 8%, 450MPa and 1000h is not more than 8%.
3, the present invention improves the toughness of product and reduces the stress relaxation rate of product on the basis meeting new nation's standard-required, reduce resource occupation, compare with the following screw-thread steel of IV level and can reduce screw-thread steel use amount 10 ~ 20%, meet the requirement of national energy-saving environmental protection, market application foreground is good, has significant economic benefit.
Accompanying drawing explanation
Fig. 1 is the first arrangement mode of bending roll of the present invention.
Fig. 2 is bending roll the second arrangement mode of the present invention.
In figure: I-bends descaling device; II-cold mill complex; 1 ~ 8-bending roll; The passive roll of 9-the 1st frame; 10-the 2nd frame driving rollers; A-roller central line; B-rolling centerline; C-bending roll center line.
Detailed description of the invention
In order to understand the present invention further, below in conjunction with the drawings and specific embodiments, it is described in detail, but the present invention is not limited to following embodiment.
With the Q235 carbon structural steel hot rolling wire rod of diameter phi 6.5 ~ 15.5mm, for raw material, (its composition meets standard " GB/T701-2008 hot-rolled carbon steel wire rods " in the present invention, appearance and size meets standard " GB/T14981-2009 gren rod size, profile, weight and tolerance "), by uncoiling unwrapping wire, bending de-scaling, two passages are cold rolling, burning optimization on line, two rib spirals of the simple procedures production diameter phi 5 ~ 12mm such as rolling, its tensile strength is not less than 650MPa, fracture elongation is not less than 8%, stress relaxation rate under 450MPa and 1000h is not more than 8%, appearance and size meets standard " GB13788-2008 cold rolled reinforcing steel bar with ribs ", there is low cost, the distinguishing feature of high strength and better toughness, there is unique novelty.
Working diameter 120 ~ the 125mm of the bending roll that the present invention uses, in this scope, roller footpath can ensure that circle base de-scaling BENDING PROCESS realizes certain plastic elongation away from roll surface side, only elastic compression occurring near roll surface side, only there is extension in de-scaling process by circle base order forward and back-flexing and subtracts cross section deformation in circle base; According to rolling deformation degree, the bending roll arrangement mode of two kinds of different types is set, extensional and rolling deformation are matched, ensure overall evenly extensional.The first arrangement mode: as shown in Figure 1, bending roll quantity 4, along roll line " one " word arrangement, bending roll (1,2,3,4) center line is vertical with rolling centerline, with the 2nd frame driving rollers centerline parallel; The second arrangement mode: as shown in Figure 2, bending roll quantity 4, wherein bending roll (5,8) center line is vertical with rolling centerline, with the 2nd frame driving rollers centerline parallel, and middle 2 bending roll (6,7) center lines and rolling center line parallel.
Embodiment 1
Take diameter as the Q235 cold-rolled thread steel of 12mm specification be example, circle base diameter 15.5mm, bending roll arrangement mode press Fig. 1 mode.Spiral after rolling carries out Performance Detection, and result is as shown in table 1.
The cold-rolled ribbed spiral performance comparison of table 1 diameter 12mm
Embodiment 2
Take diameter as the Q235 cold-rolled thread steel of 8mm specification be example, circle base diameter 10.5mm, bending roll arrangement mode press Fig. 2 mode.Spiral after rolling carries out Performance Detection, and result is as shown in table 2.
The cold-rolled ribbed spiral performance comparison of table 2 diameter 8mm
In [note] table 1,1 group is the cold-rolled threaded reinforcing steel adopting this technology to produce, and market has no like product.In table 2,1 group is the cold-rolled threaded reinforcing steel adopting this technology to produce, and 2 groups is the cold-rolled ribbed spiral of market same specification.Table 2 does not reach more than 650MPa due to the tensile strength of market same specification product, so the stress relaxation rate do not carried out under 450MPa and 1000h detects.
Claims (2)
1. the production method of an energy-saving building cold-rolled threaded reinforcing steel, comprise the work hardening technique of bending descaling process, cold roller and deformed process, it is characterized in that, also comprise and evenly extend reinforcement process, this technique by controlling the diameter of bending roll, quantity, orientation accomplish to cooperatively interact with cold roller and deformed, the horizontal each position of section of rolled piece is made to realize longitudinally evenly extensional, reduce the residual stress that inhomogeneous deformation causes, reducing and roll after-baking temperature, reaching by rolling rear online K cryogenic treatment the object improved reinforcing bar impact flexibility, keep intensity after cold deformation;
The working diameter of described bending roll is 120 ~ 125mm, and its quantity is set to 4, ensures that bending de-scaling procedural order realizes forward and the back-flexing of circle base; Described 4 bending rolls (1,2,3,4) are along rolling centerline " one " word arrangement, bending roll center line is vertical with rolling centerline, with the 2nd frame driving rollers (10) centerline parallel, extensional and rolling deformation are matched, ensures the even extensional of steel bar overall.
2. the production method of an energy-saving building cold-rolled threaded reinforcing steel, comprise the work hardening technique of bending descaling process, cold roller and deformed process, it is characterized in that, also comprise and evenly extend reinforcement process, this technique by controlling the diameter of bending roll, quantity, orientation accomplish to cooperatively interact with cold roller and deformed, the horizontal each position of section of rolled piece is made to realize longitudinally evenly extensional, reduce the residual stress that inhomogeneous deformation causes, reducing and roll after-baking temperature, reaching by rolling rear online K cryogenic treatment the object improved reinforcing bar impact flexibility, keep intensity after cold deformation;
The working diameter of described bending roll is 120 ~ 125mm, and its quantity is set to 4, ensures that bending de-scaling procedural order realizes forward and the back-flexing of circle base; The center line of described first and last bending roll (5,8) is vertical with rolling centerline, with the 2nd frame driving rollers (10) centerline parallel, described bent intermediate roller (6,7) center line and rolling center line parallel, extensional and rolling deformation are matched, ensures the even extensional of steel bar overall.
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| CN108672493A (en) * | 2018-04-11 | 2018-10-19 | 新疆八钢铁股份有限公司 | A kind of hot drawing formula milling method |
| CN108687133A (en) * | 2018-05-22 | 2018-10-23 | 安徽马钢比亚西钢筋焊网有限公司 | A kind of online stress eliminating device of steel bar cold rolling |
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| CN2095720U (en) * | 1990-10-26 | 1992-02-12 | 江苏江阴钢绳总厂 | Continuous pretreatment device for wire material surface |
| CN100431724C (en) * | 2004-04-05 | 2008-11-12 | 朱晖 | Cold-rolling nicking reinforcing bar with rib high-strength and low relaxation, production and production line thereof |
| CN101585052A (en) * | 2009-05-22 | 2009-11-25 | 北京铁科首钢轨道技术有限公司 | Large-diameter and high-strength finish rolling deformed bar and its manufacturing technique |
| KR101280502B1 (en) * | 2011-03-11 | 2013-07-01 | 포항공과대학교 산학협력단 | High strength and high manganese steel wire rod having excellent cold head quality and method for manufacturing the same, and method for manufacturing bolt using the same |
| CN102303043B (en) * | 2011-09-14 | 2013-10-30 | 邵阳高华工贸实业有限公司 | Cold-rolled ribbed steel bar production device and production method for same |
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Effective date of registration: 20210427 Address after: 243000 No.1, Yingbin Avenue, industrial concentration area, Taibai Town, Dangtu County, Ma'anshan City, Anhui Province Patentee after: Ma'anshan Yanlong New Material Technology Co.,Ltd. Address before: 243002 Anhui province Ma'anshan Huashan Lake District Road No. 59 Patentee before: ANHUI University OF TECHNOLOGY |