CN106282780A - A kind of 630MPa level high-strength hot-rolled steel bar steel and preparation method thereof - Google Patents

A kind of 630MPa level high-strength hot-rolled steel bar steel and preparation method thereof Download PDF

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Publication number
CN106282780A
CN106282780A CN201610867389.9A CN201610867389A CN106282780A CN 106282780 A CN106282780 A CN 106282780A CN 201610867389 A CN201610867389 A CN 201610867389A CN 106282780 A CN106282780 A CN 106282780A
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China
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strength hot
level high
rolled steel
steel bar
630mpa
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Inventor
郭湛
吴坚
于同仁
陈开智
赵海燕
黄社清
张步海
吴科成
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Ma''anshan Iron And Steel Ltd By Share Ltd
Magang Group Holding Co Ltd
Maanshan Iron and Steel Co Ltd
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Ma''anshan Iron And Steel Ltd By Share Ltd
Magang Group Holding Co Ltd
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Priority to CN201610867389.9A priority Critical patent/CN106282780A/en
Publication of CN106282780A publication Critical patent/CN106282780A/en
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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/06—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires
    • C21D8/08—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires for concrete reinforcement
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/001—Ferrous alloys, e.g. steel alloys containing N
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Heat Treatment Of Steel (AREA)

Abstract

The present invention relates to a kind of 630MPa level high-strength hot-rolled steel bar steel and preparation method thereof, it contains by weight percentage: 0.22～0.28%C, 0.40～0.80%Si, 1.40～1.60%Mn ,≤0.035%P ,≤0.035%S, 0.02～0.04%Nb, 0.05～0.07%V, 0.20～0.40%Cr, 0.008～0.012%N, remaining is Fe and inevitable impurity element.Processing method comprises the steps: to use said ratio and component, smelts in converter, electric arc furnace or other smelting furnace；The outer ladle argon-blown refine of stove；140 or 150 continuous small-billet castings；The rolling of thermal mechanical rolling technique is used on bar mill；Cooling.Under the conditions of existing technological equipment, using the microalloying mode of V, Nb combination, use cooling controlling and rolling controlling process, the 630MPa level reinforcement property of production is stable, and comprehensive mechanical property is preferable.

Description

A kind of 630MPa level high-strength hot-rolled steel bar steel and preparation method thereof
Technical field
The present invention relates to Concrete-used Hot-rolling Ribbed Reinforcing Bar technology, be specifically related to a kind of 630MPa level high-strength hot-rolled steel bar and use Steel and preparation method thereof.
Background technology
Compared with common hot-rolled reinforced bar, high-strength hot-rolled steel bar has that intensity is high, combination property (processing performance, welding performance, Ductility, anti-seismic performance etc.) excellent, energy-conserving and environment-protective, length in service life, safety advantages of higher.Developed countries is eliminated already The reinforcing bar of low intensity level, English, moral, Australia, Fa Deng state widely used 500MPa level reinforcing bar, 600MPa level reinforcing bar there has also been in a large number should With.Compared with developed countries, China's reinforced steel bar strength is the most relatively low.Recently as national a series of high tensile reinforcement popularization and application political affairs Plan is put into effect, and high tensile reinforcement usage percentage rises year by year, China's 400MPa level above high tensile reinforcement consumption in 2015 oneself reach to build Build more than the 80% of steel axis force.
The research of engineering design shows, on the premise of not reducing xoncrete structure overall performance, can use little one-level The 630MPa level reinforcing bar of specification replaces 400MPa level reinforcing bar, as φ 25mm HRB630 can be used to replace φ 28mm HRB400, from And realize the purpose of construction(al)steel minimizing.Being computed, steel using amount can reduce more than 40%.It addition, 630MPa level high tensile reinforcement Problems such as " fat beams and columns " can also be solved in building structure, increase building usable floor area, make structure design more reasonable, favorably In scientific development and the adjustment of steel and iron industry product structure of promotion engineering construction, sustainable to eliminating the backward production facilities, implementing Development strategy is significant.
The patent documentation of Chinese Patent Application No. 201310444163.4 discloses " a kind of 630MPa level high-strength hot-rolled steel bar And production technology ".This spiral comprises following component: 0.38～0.43%C, 0.8～1.1%Cr, 0.75～1.0% Mn, 0.15～0.25%Mo, 0.15～0.3%Si ,≤0.035%S, P ,≤0.035%N, surplus is Fe.This spiral Manufacture method " uses heating furnace to be heated to 1000-1200 DEG C, then reinforcing bar fast speed is cooled to through online first refrigerating work procedure 610-630 DEG C, then in quenching unit with water or quenching liquid carry out for time 12-14 second quenching, be then passed through tempering heating Stove is heated to 550-660 DEG C of tempering, then is cooled to room temperature by the second cooling technique ".It has the disadvantage that (1) Cr content More than more than 0.8%, it is unfavorable for extending index, easy brittle failure；(2) C, N content are too high, are unfavorable for welding performance；(3) domestic reinforcing bar Production line does not has online back-fire arrangement mostly, and production technology is difficulty with.
The patent documentation of Chinese Patent Application No. 201410137203.5 discloses " a kind of 600MPa level carefully brilliant high-strength anti-shock Method for producing steel bar ", reinforcing bar composition is: 0.24%～0.28%C, 0.62%～0.80%Si ,≤1.30%Mn ,≤ 0.035%P, S, 0.10%～0.20%V, 0.20%～0.50%Cr, remaining is ferrum.The heating of heated stove and bar mill roll System, then wear water management cooling after rolling.It has the disadvantage that (1) intensity rank is 600MPa, non-630MPa；(2) use Cr improves intensity index, but is unfavorable for Ductility Index, and reinforcing bar easily occurs without yield phenomenon and brittle failure occurs；(3) thin crystalline substance is used Invigoration effect improves intensity, but the welding performance of fine-grained steel muscle needs verification experimental verification.
The patent documentation of Chinese Patent Application No. 201210252106.1 discloses " a kind of 600MPa level antidetonation spiral And manufacture method ".Reinforcing bar basis: 0.21～0.26%C, 0.61～0.80%Si, 1.30～1.60%Mn, 0.15～ 0.21%V；Optional member: 0.001～0.050%Nb, 0.001～0.050%Ti, 0.10～0.50%Cr, 0.0001～ 0.0050%B, any one or the two or more combination in 0.001～0.010%Mo；Remaining is Fe and the most miscellaneous Matter.The manufacture method of this spiral uses " converter or electric furnace smelting+continuous small-billet casting tandem rolling+cold bed cooling " short route work Skill.It has the disadvantage that (1) intensity rank is 600MPa, non-630MPa；(2) V content is more than more than 0.15%, and mainly Being that the solution strengthening utilizing vanadium improves intensity, the precipitation strength not making full use of vanadium improves intensity, and vanadium improves the work of intensity With being that precipitation strength is more than solution strengthening；(3) the alloying element price such as vanadium, molybdenum, chromium is higher, is unfavorable for that competitiveness improves in enterprise.
Summary of the invention
For above prior art problem, it is an object of the invention to provide a kind of 630MPa level high-strength hot-rolled steel bar steel And preparation method thereof, make intensity rank reach 630MPa on the premise of not reducing Ductility Index, meet high-rise, large span and build The needs of building structure.Concrete technical scheme is as follows:
A kind of 630MPa level high-strength hot-rolled steel bar steel, it contains by weight percentage: 0.22～0.28%C, 0.40～ 0.80%Si, 1.40～1.60%Mn ,≤0.035%P ,≤0.035%S, 0.02～0.04%Nb, 0.05～0.07%V, 0.20～0.40%Cr, 0.008～0.012%N, remaining is Fe and inevitable impurity element.
The processing method of a kind of 630MPa level high-strength hot-rolled steel bar steel, comprises the steps:
(1) use said ratio and component, smelt in converter, electric arc furnace or other smelting furnace；
(2) the outer ladle argon-blown refine of stove；
(3) 140 or 150 continuous small-billet castings；
(4) rolling of thermal mechanical rolling technique is used on bar mill；
(5) cooling.
Further, step (5) including: (5-1) cold bed natural cooling；(5-2) stacking natural cooling.
Further, step (4) including: (4-1) heating and temperature control is at 1000～1200 DEG C；Soaking temperature controls 1050～1150 DEG C；(4-2) start rolling temperature controls at 950～1100 DEG C；(4-3) enter finishing mill temperature to control 850～950 ℃；(4-4) upper cold bed red temperature controls at 780～900 DEG C.
Further, in step (4-4), rolling specs is the biggest, it is desirable to upper cold bed red temperature the lowest.
Further, step (1) uses 60 tons of converter smeltings.
Further, strong argon blowing time >=4min, soft argon blowing time >=4min. in step (2)
Further, 150 billet continuous castings in step (3), step (4) rolls on continuous rod mill.
Compared with currently available technology, the present invention is designed by the composition of resource-conserving, and combines thermal mechanical rolling technique (TMCP) high-strength, the 630MPa level hot rolled ribbed bars of high-ductility is produced, its yield strength >=630MPa, tensile strength >= 790MPa, elongation after fracture >=14%, percentage of total elongation >=9% under maximum, force, strong flexor ratio >=1.25, bend ratio≤1.30.Wanted The key technology solved is to provide alloy component range and the thermal mechanical rolling technique of a kind of 630MPa level high tensile reinforcement, to meet city The field demand to 630MPa level high-strength hot-rolled steel bar.Specifically: under the conditions of existing technological equipment, the micro-of V, Nb combination is used Alloying mode, uses cooling controlling and rolling controlling process, and the 630MPa level reinforcement property of production is stable, and comprehensive mechanical property is preferable, and it is bent Take intensity >=630MPa, tensile strength >=790MPa, elongation after fracture >=14%, percentage of total elongation >=9% under maximum, force, strong flexor ratio >=1.25, bend ratio≤1.30.Microalloy element consumption is suitable with HRB500 reinforcing bar, can reduce than using pair rolling technique The microalloy element consumption of more than 50%, remarkable benefit.
Accompanying drawing explanation
Fig. 1 is 630MPa level reinforcing bar tissue (lot number K15-63 × 100)
Fig. 2 is 630MPa level reinforcing bar tissue (lot number K15-64 × 100)
Detailed description of the invention
Describing the present invention below according to accompanying drawing, it is that the one in numerous embodiments of the present invention is the most real Execute example.
In a preferred embodiment, the chemical composition proportioning (by weight hundred of 630MPa level high tensile reinforcement steel of the present invention Proportion by subtraction) be: 0.22～0.28%C, 0.40～0.80%Si, 1.40～1.60%Mn ,≤0.035%P ,≤0.035%S, 0.02～0.04Nb, 0.05～0.07%V, 0.20～0.40%Cr, 0.008～0.012%N, remaining is that Fe is with inevitable Impurity element.
The present invention need to be smelted in converter, electric arc furnace or other smelting furnace by mentioned component requirement, stove outer ladle argon-blown essence Refining, 140 or 150 continuous small-billet castings, bar mill uses the rolling of thermal mechanical rolling technique, cold bed natural cooling, stacking is the coldest But.
TMCP thermal mechanical rolling technology controlling and process point is as follows:
(1) heating and temperature control is at 1000～1200 DEG C；Soaking temperature；Control at 1050～1150 DEG C；
(2) start rolling temperature controls at 950～1100 DEG C；
(3) enter finishing mill temperature to control at 850～950 DEG C；
(4) upper cold bed red temperature controls at 780～900 DEG C, and rolling specs is the biggest, it is desirable to upper cold bed red temperature The lowest.
The present invention uses the method that V, Nb combine, and utilizes V Yu C, N disperse educt invigoration effect in steel, utilizes Nb to show Write and postpone austenite recrystallization, the effect of crystal grain thinning, and the compound invigoration effect ratio of V, Nb to be used alone one of which more aobvious Write.The strict content limiting N element, controls between 4～6 by V/N ratio, plays the precipitation strength effect of V to greatest extent, and not The defects such as strand rimhole can be too much caused because of N element.N content scope the most of the present invention requires model at GB 1499.2-2007 In enclosing, also it is easily able in big commercial production.Steel adds Cr, the quenching degree of steel, refinement pearlitic structrure, secondary can be improved Induration is obvious, can further improve reinforced steel bar strength, also improves the anti-corrosion capability of reinforcing bar simultaneously.
The present invention uses 140 or 150 small billet, is used by current most domestic steel mill, is not required to little to 140 or 150 Square billet is transformed into the square billet of more than 165.
Thermal mechanical rolling technique of the present invention, heating and temperature control is at 1000～1200 DEG C；Soaking temperature control 1050～ 1150 DEG C, start rolling temperature controls at 950～1100 DEG C, enters finishing mill temperature and controls at 850～950 DEG C.
Arranging rapid water device for cooling after finishing mill, by stopping cooling after being as cold as phase change zone after rolling soon, rebar surface obtains The thinnest ferrite+pearlitic structrure.Compared with rolling rear Water cooling production technology, thermal mechanical rolling is also adopted by wearing water Cooling technique.The purpose rolling rear Water cooling mainly realizes transformation of austenite to martensite at low temperatures, forms martensite Top layer, then obtain tempered structure by the heart portion self tempering to surface；And thermal mechanical rolling is to make rolled piece fast by rapid cooling after finish rolling Speed, by austenite phase field, keeps rolled piece austenite hardening state, terminates to the dynamic phase trasnsition point of ferrite transformation at austenite Cooling, growing up of suppression ferrite crystal grain, top layer is fine grain ferrite+pearlitic structrure, and grain size reaches 9 grades.
The present invention uses composition design and the PMCP thermal mechanical rolling technique of resource-conserving, comprehensively utilizes microalloy element The multiple strengthening means such as solid solution, precipitation strength and refined crystalline strengthening, it is achieved on the premise of keeping material plasticity, produce comprehensive The 630MPa level reinforcing bar of function admirable.
In a further advantageous embodiment, the melting chemical composition of the present invention is shown in Table 1, uses 60 tons of converter smeltings, ladles Ar blowing refining, strong argon blowing time >=4min, soft argon blowing time >=4min, 150 billet continuous castings, roll on continuous rod mill System, its TMCP thermal mechanical rolling technological parameter is shown in Table 2, and mechanical property is shown in Table 3.
The melting chemical composition of table 1 embodiment of the present invention
The TMCP technological parameter of table 2 embodiment of the present invention
The mechanical property of table 3 embodiment of the present invention
Wherein: ReL is yield strength；Rm is tensile strength；Strong flexor ratio (Rmo/ReLo), RmoFor surveying tensile strength, ReLoFor actual measurement yield strength；Bend than (ReLo/ 630), 630 is HRB630 reinforcement yielding strength characteristics value, units MPa；A is Elongation after fracture；Agt is elongation percentage under maximum, force.
Above in conjunction with accompanying drawing, the present invention is exemplarily described, it is clear that the present invention implements not by aforesaid way Restriction, as long as have employed method design and the various improvement that carry out of technical scheme of the present invention, or the most improved direct application In other occasion, all within protection scope of the present invention.

Claims (8)

1. a 630MPa level high-strength hot-rolled steel bar steel, it is characterised in that it contains by weight percentage: 0.22～0.28% C, 0.40～0.80%Si, 1.40～1.60%Mn ,≤0.035%P ,≤0.035%S, 0.02～0.04%Nb, 0.05～ 0.07%V, 0.20～0.40%Cr, 0.008～0.012%N, remaining is Fe and inevitable impurity element.
2. the processing method of a 630MPa level high-strength hot-rolled steel bar steel, it is characterised in that comprise the steps:
(1) use proportioning and component described in claim 1, smelt in converter, electric arc furnace or other smelting furnace；
(2) the outer ladle argon-blown refine of stove；
(3) 140 or 150 continuous small-billet castings；
(4) rolling of thermal mechanical rolling technique is used on bar mill；
(5) cooling.
3. the processing method of 630MPa level high-strength hot-rolled steel bar steel as claimed in claim 2, it is characterised in that step (5) Including:
(5-1) cold bed natural cooling；
(5-2) stacking natural cooling.
4. the processing method of the 630MPa level high-strength hot-rolled steel bar steel as described in claim 2 and 3, it is characterised in that step (4) including:
(4-1) heating and temperature control is at 1000～1200 DEG C；Soaking temperature controls at 1050～1150 DEG C；
(4-2) start rolling temperature controls at 950～1100 DEG C；
(4-3) enter finishing mill temperature to control at 850～950 DEG C；
(4-4) upper cold bed red temperature controls at 780～900 DEG C.
5. the processing method of 630MPa level high-strength hot-rolled steel bar steel as claimed in claim 4, it is characterised in that step (4- 4), in, rolling specs is the biggest, it is desirable to upper cold bed red temperature the lowest.
6. the processing method of the 630MPa level high-strength hot-rolled steel bar steel as described in claim 2-5, it is characterised in that step (1) 60 tons of converter smeltings are used in.
7. the processing method of the 630MPa level high-strength hot-rolled steel bar steel as described in claim 2-6, it is characterised in that step (2) strong argon blowing time >=4min, soft argon blowing time >=4min in.
8. the processing method of 630MPa level high-strength hot-rolled steel bar steel as claimed in claim 2-7, it is characterised in that step (3) 150 billet continuous casting in, rolls in step (4) on continuous rod mill.
CN201610867389.9A 2016-09-29 2016-09-29 A kind of 630MPa level high-strength hot-rolled steel bar steel and preparation method thereof Pending CN106282780A (en)

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CN106756566A (en) * 2017-01-17 2017-05-31 浙江富钢金属制品有限公司 A kind of Aldecor transmission rod and its manufacture method
CN107245649A (en) * 2017-06-13 2017-10-13 马鞍山钢铁股份有限公司 A kind of High-strength high-plasticity heavy duty goods train wheel-use steel material and its production method
CN107723603A (en) * 2017-11-29 2018-02-23 安徽工业大学 Yield strength 500MPa levels corrosion-resistant steel bar and manufacture method
CN107747048A (en) * 2017-11-30 2018-03-02 攀钢集团攀枝花钢铁研究院有限公司 Steel wire rod and its production method are built containing V, Nb, Ti, Cr microalloy
CN107747045A (en) * 2017-11-29 2018-03-02 安徽工业大学 A kind of 400MPa levels environmental corrosion of resistance to Cl reinforcing bar and its manufacture method
CN107747061A (en) * 2017-09-14 2018-03-02 河钢股份有限公司 A kind of 630MPa levels high-strength tenacity hot rolled ribbed bars and its production method
CN109023123A (en) * 2018-10-12 2018-12-18 石横特钢集团有限公司 A kind of production method of 840MPa grades of hot rolling anchor pole reinforcing bar
CN109706391A (en) * 2018-12-14 2019-05-03 河钢股份有限公司承德分公司 A kind of 60 kg class high-strength welding wire gren rod and its production method
CN109881118A (en) * 2019-04-17 2019-06-14 魏滔锴 A kind of 650MPa grades of high-strength explosion-proof fire resisting reinforcing bar steel and its thermal mechanical rolling technique
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
CN111270127A (en) * 2018-12-04 2020-06-12 魏滔锴 Steel for 635MPa grade high-strength hot-rolled steel bar
CN112522627A (en) * 2020-12-09 2021-03-19 黑龙江建龙钢铁有限公司 600 MPa-grade high-strength hot-rolled ribbed anti-seismic corrosion-resistant reinforcing steel bar and production process thereof
CN113637916A (en) * 2021-08-19 2021-11-12 山西通才工贸有限公司 Ultrahigh-strength hot-rolled anchor rod steel bar and production method thereof
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
CN114645193A (en) * 2021-05-28 2022-06-21 广西柳州钢铁集团有限公司 HRB600E twisted steel bar produced by high-speed bar
CN114990429A (en) * 2022-05-07 2022-09-02 本钢板材股份有限公司 High-strength anti-seismic steel bar HRB600E and production method thereof
CN115094334A (en) * 2022-07-20 2022-09-23 安徽吾兴新材料有限公司 High-strength chloride-corrosion-resistant steel bar for concrete structure and production method thereof
CN117051325A (en) * 2023-08-31 2023-11-14 昆明理工大学 Low-cost Nb-V microalloyed 630 MPa-level high-strength anti-seismic steel bar

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Cited By (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106756566A (en) * 2017-01-17 2017-05-31 浙江富钢金属制品有限公司 A kind of Aldecor transmission rod and its manufacture method
CN107245649A (en) * 2017-06-13 2017-10-13 马鞍山钢铁股份有限公司 A kind of High-strength high-plasticity heavy duty goods train wheel-use steel material and its production method
CN107245649B (en) * 2017-06-13 2019-02-19 马鞍山钢铁股份有限公司 A kind of High-strength high-plasticity heavy duty goods train wheel-use steel material and its production method
CN107747061A (en) * 2017-09-14 2018-03-02 河钢股份有限公司 A kind of 630MPa levels high-strength tenacity hot rolled ribbed bars and its production method
CN107723603A (en) * 2017-11-29 2018-02-23 安徽工业大学 Yield strength 500MPa levels corrosion-resistant steel bar and manufacture method
CN107747045A (en) * 2017-11-29 2018-03-02 安徽工业大学 A kind of 400MPa levels environmental corrosion of resistance to Cl reinforcing bar and its manufacture method
CN107747048A (en) * 2017-11-30 2018-03-02 攀钢集团攀枝花钢铁研究院有限公司 Steel wire rod and its production method are built containing V, Nb, Ti, Cr microalloy
CN109023123A (en) * 2018-10-12 2018-12-18 石横特钢集团有限公司 A kind of production method of 840MPa grades of hot rolling anchor pole reinforcing bar
CN111270127B (en) * 2018-12-04 2021-06-22 安徽吾兴新材料有限公司 Steel for 635MPa grade high-strength hot-rolled steel bar
CN111270127A (en) * 2018-12-04 2020-06-12 魏滔锴 Steel for 635MPa grade high-strength hot-rolled steel bar
CN109706391A (en) * 2018-12-14 2019-05-03 河钢股份有限公司承德分公司 A kind of 60 kg class high-strength welding wire gren rod and its production method
CN109881118A (en) * 2019-04-17 2019-06-14 魏滔锴 A kind of 650MPa grades of high-strength explosion-proof fire resisting reinforcing bar steel and its thermal mechanical rolling technique
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
CN112522627A (en) * 2020-12-09 2021-03-19 黑龙江建龙钢铁有限公司 600 MPa-grade high-strength hot-rolled ribbed anti-seismic corrosion-resistant reinforcing steel bar and production process thereof
CN114645193A (en) * 2021-05-28 2022-06-21 广西柳州钢铁集团有限公司 HRB600E twisted steel bar produced by high-speed bar
CN113637916A (en) * 2021-08-19 2021-11-12 山西通才工贸有限公司 Ultrahigh-strength hot-rolled anchor rod steel bar and production method thereof
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
CN114990429A (en) * 2022-05-07 2022-09-02 本钢板材股份有限公司 High-strength anti-seismic steel bar HRB600E and production method thereof
CN115094334A (en) * 2022-07-20 2022-09-23 安徽吾兴新材料有限公司 High-strength chloride-corrosion-resistant steel bar for concrete structure and production method thereof
CN117051325A (en) * 2023-08-31 2023-11-14 昆明理工大学 Low-cost Nb-V microalloyed 630 MPa-level high-strength anti-seismic steel bar
CN117051325B (en) * 2023-08-31 2024-05-24 昆明理工大学 Low-cost Nb-V microalloyed 630 MPa-level high-strength anti-seismic steel bar

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