CN101445894A - Large-specification high-intensity steel rod and production process - Google Patents
Large-specification high-intensity steel rod and production process Download PDFInfo
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- CN101445894A CN101445894A CNA200810152864XA CN200810152864A CN101445894A CN 101445894 A CN101445894 A CN 101445894A CN A200810152864X A CNA200810152864X A CN A200810152864XA CN 200810152864 A CN200810152864 A CN 200810152864A CN 101445894 A CN101445894 A CN 101445894A
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Abstract
The invention relates to the technical field of steels for reinforced concrete. At present, the maximum specification of steel rod produced in enterprises is 40mm, which only meets the performance demands of HRB335, HRB400 and fails to reach the requirement of British standard 460B steel rod. As a result, the invention proposes [phi]50mm high-intensity screwed steel rod products and production process thereof by improving online low-temperature rolled LTR water tank. The main components are (based on weight percent): C=0.17-0.24%, Si=0.40-0.60%, Mn=1.20-1.55%, V=0.08-0.12%, S is not more than 0.045%, P is not more than 0.045%, and Fe in equilibrium amount, carbon equivalent (Ceq)=0.47-0.51%, diameter and inner diameter of the steel rod are 50.0mm and 49.0+/-0.3mm. The production process thereof uses the production process of steel billet heating-rough rolling-moderate rolling-controlled cooling-natural cooling-scaling-checkup-warehousing. The heating procedure employs a three-phase heating manner of pre-heating, heating and uniform heating; the rough rolling employs 6 micro tensions for rolling; the moderate rolling employs 4 micro tensions for rolling; the controlled cooling procedure is implemented with two LTR water tanks; the natural cooling procedure is implemented in a manner of natural cooling by a cooling bed.
Description
Technical field
The present invention relates to employed big specification, high strength cast iron and technical field of producing in the Steel Concrete technical field of steels, particularly reinforced concrete member.
Technical background
The Steel Concrete Ribbed Bar is the base mateiral of domestic and international construction work, also is a kind of steel products that the whole world generally produces and uses.Appearance along with high level, large span, antidetonation, low temperature resistant, fire-resistive construction structure makes reinforcing bar develop towards major diameter, high strength, high tenacity and good directions such as weldability.The world market increases day by day to the demand of large-size high-tensile degree Twisted Steel.
The maximum specification of the most of reinforcing bar that iron and steel enterprise produces of China is 40mm at present, the method that adopts is to add V, V-N, Nb, Ti microalloying and hot rolling technology with 20MnSi to realize, product performance only satisfy the performance requriements of HRB335, HRB400, can not reach the high-intensity requirement as English mark 460B reinforcement yielding intensity 460MPa.
Even the 5th generation of Italian Da Nieli (DANIELI) company novel two roller short stress path rolling mills, low temperature rolling (LTR) and quenching, self-tempering are handled (QTB) and are worn cooling process, promptly roll back Heat Treatment technology, the design maximum specification is Φ 40mm, can not satisfy the production of Φ 50mm Twisted Steel.If produce Φ 50mm Twisted Steel, just must the integral body of low temperature rolling (LTR) water tank be redesigned, manufacture.
At this situation, for farthest reducing production costs, save the scrap build expense, shorten the lead time, by online low temperature rolling (LTR) water tank is improved, adopt 20MnSi to add the V microalloying and combine, proposed Φ 50mm high-strength deformed steel bar muscle product and production technique with post-rolling control cooling process.
Summary of the invention
Large-specification high-intensity steel rod of the present invention and production technique mainly realize by following means.
Large-specification high-intensity steel rod of the present invention, main component is (by weight percentage) C=0.17-0.24%, Si=0.40-0.60%, Mn=1.20-1.55%, V=0.08-0.12%, S≤0.045%, P≤0.045%, and the Fe of equal amount, carbon equivalent (Ceq)=C+Mn/6+ (Cr+Mo+V)/5+ (Ni+Cu)/15=0.47-0.51%, bar diameter 50.0mm, internal diameter are 49.0 ± 0.3mm.
The large-specification high-intensity steel rod production technique of invention, adopt steel billet heating → roughing → in roll → production process route of LTR controlled chilling → naturally cooling → scale → check → warehouse-in.In heating process, continuous casting square billet is adopted preheating, heating, three sections type of heating of soaking, wherein the preheating section temperature is 700 ℃-900 ℃, the heating zone temperature is 1030 ℃-1180 ℃, the soaking zone temperature is 1070 ℃-1170 ℃, heating total time is 80-120 minute, and start rolling temperature is 1000 ℃-1080 ℃; It is rolling to part power a little 6 of roughing operation employings; In roll operation and adopt 4 to part power a little rolling; In the controlled chilling operation, carry out controlled chilling by two LTR water tanks, returning red temperature is 650 ℃-750 ℃; In the naturally cooling operation, adopt cold bed naturally cooling mode.
The production process route of above-mentioned large-specification high-intensity steel rod in heating process, adopts side to advance the heat accumulating type walking beam reheating furnace that side goes out, and makes the steel billet temperature difference＜50 ℃.In the roughing operation, use Φ 650mm4 frame, Φ 550mm2 frame, totally 6, the 6th goes out the lipstick base and is of a size of 78.4mm * 76mm, gap values between rollers 12.4mm.In roll operation, use Φ 550mm2 frame, Φ 430mm2 frame, totally 4, the red base of finished product sortie is of a size of 50.7mm * 50.7mm, gap values between rollers 4.5mm, finish to gauge speed is 2.9-3.19m/s.In LTR controlled chilling operation, the cooling water outlet pressure-controlling is at 0.6-0.8MPa, and water cooler is opened and add up to 8-12, and the water coolant total flux is 380-480m
3/ h, returning red temperature is 650-750 ℃.
The characteristic that requirement of using according to the large-specification high-intensity steel rod product and characteristics and LTR control cold charge are equipped with, optimization design reinforcing bar chemical ingredients, adopt improved LTR technology for controlled cooling, make the top layer of reinforcing bar different phase transformations take place to heart portion, obtain different metallographic structures, upper layer intensity height, and heart portion have good mould, toughness.Reinforcement yielding intensity R
EL〉=490MPa, tensile strength R
m〉=620MPa, strong flexor ratio 〉=1.22, elongation A 〉=19% all are better than British Standard, and performance is uniform and stable.
Description of drawings
Below in conjunction with description of drawings.Fig. 1 is the large-specification high-intensity steel rod technological process of production synoptic diagram that the present invention designs.In the accompanying drawings, in heating process, comprise preheating → heating → soaking; In the controlled chilling operation, comprise 1# LTR water tank controlled chilling → 2# LTR water tank controlled chilling.
Embodiment
Describe in detail below in conjunction with accompanying drawing.As shown in Figure 1, production process route of the present invention be steel billet heating → roughing → in roll → LTR controlled chilling → naturally cooling → scale → check → warehouse-in.In the steel billet heating process, comprise preheating, heating and soaking, in the controlled chilling operation, comprise 1#LTR water tank controlled chilling and 2# LTR water tank controlled chilling.
Concrete technical measures comprise:
The one, the preferred and setting of chemical ingredients.
The characteristic of requirement of using greater than the high strength cast iron product of 460MPa according to the big specification of diameter 50mm, yield strength and characteristics and the production line of bar equipment that possesses at present, particularly LTR is wherein controlled the characteristic that cold charge is equipped with, optimization design reinforcing bar chemical ingredients such as table 1, raw material adopts: 150 * 150 * 12000mm continuous casting square billet.
Table 1 large-size high-tensile degree Twisted Steel chemical ingredients unit: (%)
| C | Si | Mn | V | P | S | Fe | Carbon equivalent |
| 0.20-0.23 | 0.50-0.52 | 1.47-1.50 | 0.10 | ≤0.017 | ≤0.012 | Surplus | 0.47-0.51 |
The 2nd, production process route.
In the continuous casting square billet heating process, square billet is carried out three sections heat treated, wherein the preheating section temperature is: 700 ℃-900 ℃, the heating zone temperature is: 1030 ℃-1180 ℃, the soaking zone temperature is 1070 ℃-1170 ℃, and heating total time is 85-95 minute, and start rolling temperature is 1020 ℃-1070 ℃.
At rolling process, be divided into roughing and middle roll process.Roughing technology, it is rolling that the employing of roughing unit parts power a little, and the 6th goes out the lipstick base and is of a size of 78.4mm * 76mm, gap values between rollers 12.4mm.Middle roll process, totally 8 of middle milling train groups are used the 7th, 8,11,12 4 rolling mill, and it is rolling that employing parts power a little.The 12nd puts up the red base of product sortie is of a size of 50.7mm * 50.7mm, gap values between rollers 4.5mm.Finish to gauge speed is 3.15-3.19m/s.
In LTR controlled chilling operation, carry out controlled chilling by two LTR water tanks, correlation parameter is: the cooling water outlet pressure-controlling is at 0.6-0.7MPa, and water cooler is opened and add up to 12, and the water coolant total flux is 400-450m
3/ h, returning red temperature is 670-720 ℃.
In the naturally cooling operation, adopt cold bed naturally cooling mode.
In scale, check, warehouse-in operation, carry out scale, check, warehouse-in according to the requirement of standard code, finish the Production Flow Chart of this product.
Large-size high-tensile degree Twisted Steel according to operational path of the present invention is produced through the client is on probation, keeps reinforcing bar to have good toughness when increasing substantially reinforced steel bar strength both at home and abroad, and is specific as follows.
(1) whole stove chemical ingredients C, Si, Mn span of control are narrower, and different heats or the fluctuation of adjacent heat are little, C fluctuation range 0.03%; Si, Mn fluctuation range are controlled by 0.06% target.
(2) every mechanical performance index is uniform and stable, and yield strength is controlled at 490-540MPa, and elongation is controlled between the 19.0-23.0%, and strong flexor ratio is controlled at 1.22-1.28.
(3) technology of using the present invention to design, its every integrated performance index all are better than the performance requriements of GB GB/T1499.2-2007HRB400 steel grade and English mark BS4449:1997460B steel grade.Table specific as follows:
| Project | GB HRB400 | English mark 460B | Measured performance |
| Yield strength MPa | 400 | 460 | ≥490 |
| Tensile strength MPa | 540 | — | — |
| Elongation (Lo=5d) % | 16 | 14 | ≥19 |
| Strong flexor ratio | — | 1.08 | ≥1.22 |
Claims (6)
1, large-specification high-intensity steel rod, main component is (by % weight) C=0.17-0.24%, Si=0.40-0.60%, Mn=1.20-1.55%, V=0.08-0.12%, S≤0.045%, P≤0.045%, and the Fe of equal amount, carbon equivalent (Ceq)=0.47-0.51%, bar diameter 50.0mm, internal diameter are 49.0 ± 0.3mm.
2, large-specification high-intensity steel rod as claimed in claim 1, adopt steel billet heating → roughing → in roll → production process route of LTR controlled chilling → naturally cooling → scale → check → warehouse-in, it is characterized in that in heating process, continuous casting square billet is adopted preheating, heating, three sections type of heating of soaking, wherein the preheating section temperature is 700 ℃-900 ℃, the heating zone temperature is 1030 ℃-1180 ℃, and the soaking zone temperature is 1070 ℃-1170 ℃, and heating total time is 80-120 minute; Start rolling temperature is 1000 ℃-1080 ℃; It is rolling to part power a little 6 of roughing operation employings; In roll operation and adopt 4 to part power a little rolling; In LTR controlled chilling operation, carry out controlled chilling by two LTR water tanks, returning red temperature is 650-750 ℃.In the naturally cooling operation, adopt cold bed naturally cooling mode.
3, the production process route of large-specification high-intensity steel rod as claimed in claim 2 is characterized in that in heating process, adopts side to advance the heat accumulating type walking beam reheating furnace that side goes out, and makes the steel billet temperature difference＜50 ℃.
4, the production process route of large-specification high-intensity steel rod as claimed in claim 2 is characterized in that in the roughing operation, uses Φ 650mm4 frame, Φ 550mm2 frame, and totally 6, the 6th goes out the lipstick base and be of a size of 78.4mm * 76mm, gap values between rollers 12.4mm.
5, the production process route of large-specification high-intensity steel rod as claimed in claim 2, it is characterized in that in roll operation, use Φ 550mm2 frame, Φ 430mm2 frame, totally 4, the red base of finished product sortie is of a size of 50.7mm * 50.7mm, gap values between rollers 4.5mm, and finish to gauge speed is 2.9-3.19m/s.
6, the production process route of large-specification high-intensity steel rod as claimed in claim 2, it is characterized in that controlled chilling in two LTR water tanks of controlled chilling operation, the cooling water outlet pressure-controlling is at 0.6-0.8MPa, and water cooler is opened and add up to 8-12, and the water coolant total flux is 380-480m
3/ h, returning red temperature is 650-750 ℃.
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| CN200810152864XA CN101445894B (en) | 2008-11-06 | 2008-11-06 | Large-specification high-intensity steel rod and production process |
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|---|---|---|---|
| CN200810152864XA CN101445894B (en) | 2008-11-06 | 2008-11-06 | Large-specification high-intensity steel rod and production process |
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| CN101445894A true CN101445894A (en) | 2009-06-03 |
| CN101445894B CN101445894B (en) | 2011-01-26 |
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Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101717899B (en) * | 2009-11-25 | 2011-09-07 | 武钢集团昆明钢铁股份有限公司 | HRB500E V-N high-strength anti-seismic steel bar and production method thereof |
| CN102363832A (en) * | 2011-11-07 | 2012-02-29 | 天津钢铁集团有限公司 | Production technology of finish-rolled ribbed bars |
| CN102876968A (en) * | 2012-09-29 | 2013-01-16 | 攀钢集团成都钢钒有限公司 | High-strength anti-seismic HRB500E hot-rolled ribbed bar and production process thereof |
| CN104014594A (en) * | 2014-06-06 | 2014-09-03 | 首钢总公司 | Method for overcoming post-cold-shearing lateral bending of gear steel bar |
| CN104307890A (en) * | 2014-11-13 | 2015-01-28 | 攀枝花钢城集团有限公司 | Combined controlled rolling and cooling production technology of HRB400 hot rolled ribbed steel bars |
| CN104480388A (en) * | 2014-12-13 | 2015-04-01 | 广西科技大学 | Novel formula of semi-grouting type high-strength thick reinforcing bar |
| CN104480410A (en) * | 2014-12-13 | 2015-04-01 | 广西科技大学 | Formula of half grouting type high-strength thick reinforcing bar |
| CN104745969A (en) * | 2015-04-03 | 2015-07-01 | 甘肃酒钢集团宏兴钢铁股份有限公司 | HRB400E high-strength corrosion-resistant steel bar and production process thereof |
| CN104745968A (en) * | 2014-12-24 | 2015-07-01 | 福建三宝特钢有限公司 | HRB500E seismic steel bar and preparation method thereof |
| CN104928572A (en) * | 2015-05-27 | 2015-09-23 | 河北钢铁股份有限公司承德分公司 | Twisted steel with diameter of being 60mm and production method |
| CN106319180A (en) * | 2016-08-31 | 2017-01-11 | 云南德胜钢铁有限公司 | Machining technology of anti-knock reinforcing steel bars |
| CN107282632A (en) * | 2017-05-08 | 2017-10-24 | 首钢水城钢铁（集团）有限责任公司 | A kind of screw-thread steel finished product ripple glaze optimize technique |
| CN111500920A (en) * | 2020-06-03 | 2020-08-07 | 江苏联峰实业有限公司 | HRB600 high-strength anti-seismic deformed steel bar and production method thereof |
| CN111979486A (en) * | 2020-08-10 | 2020-11-24 | 南京钢铁股份有限公司 | 500 Mpa-grade large-size straight-bar deformed steel bar and preparation method thereof |
| CN112246888A (en) * | 2020-09-08 | 2021-01-22 | 福建泉州闽光钢铁有限责任公司 | Production method for improving surface quality of finish-rolled twisted steel |
| CN113802066A (en) * | 2021-09-18 | 2021-12-17 | 联峰钢铁（张家港）有限公司 | B600B high-strength steel bar and production process thereof |
-
2008
- 2008-11-06 CN CN200810152864XA patent/CN101445894B/en not_active Expired - Fee Related
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101717899B (en) * | 2009-11-25 | 2011-09-07 | 武钢集团昆明钢铁股份有限公司 | HRB500E V-N high-strength anti-seismic steel bar and production method thereof |
| CN102363832A (en) * | 2011-11-07 | 2012-02-29 | 天津钢铁集团有限公司 | Production technology of finish-rolled ribbed bars |
| CN102363832B (en) * | 2011-11-07 | 2013-03-20 | 天津钢铁集团有限公司 | Production technology of finish-rolled ribbed bars |
| CN102876968A (en) * | 2012-09-29 | 2013-01-16 | 攀钢集团成都钢钒有限公司 | High-strength anti-seismic HRB500E hot-rolled ribbed bar and production process thereof |
| CN102876968B (en) * | 2012-09-29 | 2014-07-09 | 攀钢集团成都钢钒有限公司 | High-strength anti-seismic HRB500E hot-rolled ribbed bar and production process thereof |
| CN104014594A (en) * | 2014-06-06 | 2014-09-03 | 首钢总公司 | Method for overcoming post-cold-shearing lateral bending of gear steel bar |
| CN104307890A (en) * | 2014-11-13 | 2015-01-28 | 攀枝花钢城集团有限公司 | Combined controlled rolling and cooling production technology of HRB400 hot rolled ribbed steel bars |
| CN104480388A (en) * | 2014-12-13 | 2015-04-01 | 广西科技大学 | Novel formula of semi-grouting type high-strength thick reinforcing bar |
| CN104480410A (en) * | 2014-12-13 | 2015-04-01 | 广西科技大学 | Formula of half grouting type high-strength thick reinforcing bar |
| CN104745968A (en) * | 2014-12-24 | 2015-07-01 | 福建三宝特钢有限公司 | HRB500E seismic steel bar and preparation method thereof |
| CN104745968B (en) * | 2014-12-24 | 2017-02-01 | 福建三宝特钢有限公司 | HRB500E seismic steel bar and preparation method thereof |
| CN104745969A (en) * | 2015-04-03 | 2015-07-01 | 甘肃酒钢集团宏兴钢铁股份有限公司 | HRB400E high-strength corrosion-resistant steel bar and production process thereof |
| CN104928572A (en) * | 2015-05-27 | 2015-09-23 | 河北钢铁股份有限公司承德分公司 | Twisted steel with diameter of being 60mm and production method |
| CN106319180A (en) * | 2016-08-31 | 2017-01-11 | 云南德胜钢铁有限公司 | Machining technology of anti-knock reinforcing steel bars |
| CN107282632A (en) * | 2017-05-08 | 2017-10-24 | 首钢水城钢铁（集团）有限责任公司 | A kind of screw-thread steel finished product ripple glaze optimize technique |
| CN111500920A (en) * | 2020-06-03 | 2020-08-07 | 江苏联峰实业有限公司 | HRB600 high-strength anti-seismic deformed steel bar and production method thereof |
| CN111979486A (en) * | 2020-08-10 | 2020-11-24 | 南京钢铁股份有限公司 | 500 Mpa-grade large-size straight-bar deformed steel bar and preparation method thereof |
| CN111979486B (en) * | 2020-08-10 | 2022-04-19 | 南京钢铁股份有限公司 | 500 Mpa-grade large-size straight-bar deformed steel bar and preparation method thereof |
| CN112246888A (en) * | 2020-09-08 | 2021-01-22 | 福建泉州闽光钢铁有限责任公司 | Production method for improving surface quality of finish-rolled twisted steel |
| CN112246888B (en) * | 2020-09-08 | 2024-01-30 | 福建泉州闽光钢铁有限责任公司 | Production method for improving surface quality of finish-rolled deformed bar |
| CN113802066A (en) * | 2021-09-18 | 2021-12-17 | 联峰钢铁（张家港）有限公司 | B600B high-strength steel bar and production process thereof |
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Granted publication date: 20110126 Termination date: 20161106 |