CN106957991A - A kind of precipitation Controlled cooling process of hot-rolled microalloy reinforcing bar - Google Patents

A kind of precipitation Controlled cooling process of hot-rolled microalloy reinforcing bar Download PDF

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Publication number
CN106957991A
CN106957991A CN201710318534.2A CN201710318534A CN106957991A CN 106957991 A CN106957991 A CN 106957991A CN 201710318534 A CN201710318534 A CN 201710318534A CN 106957991 A CN106957991 A CN 106957991A
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temperature
precipitation
cooling
controlled
reinforcing bar
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CN106957991B (en
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王卫卫
肖金福
白宇
张江玲
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Central Iron and Steel Research Institute
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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
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • 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
    • C21D11/00—Process control or regulation for heat treatments
    • C21D11/005—Process control or regulation for heat treatments for cooling
    • 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
    • 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
    • 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
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
    • C21D9/525—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length for wire, for rods
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C32/00—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ
    • C22C32/0047—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ with carbides, nitrides, borides or silicides as the main non-metallic constituents
    • 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
    • C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
    • 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
    • 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
    • C22C38/24—Ferrous alloys, e.g. steel alloys containing chromium with vanadium

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

Abstract

A kind of precipitation Controlled cooling process of hot-rolled microalloy reinforcing bar, belongs to steel novel technique field.At home and abroad Controlled cooling process optimization has been carried out on Research foundation for precipitate, on the basis of original control V/N atomic ratios and controlled rolling, increase the precipitate control of cooling procedure, promote V (C, N) disperse educt, VC precipitation ratio is reduced, and avoids precipitate back dissolving and grows up, and then reaches the purpose of crystal grain thinning；This Controlled cooling process, the heat absorption general principle for making full use of the phase transformation latent heat of vaporization Δ hv=540cal/g of water different with Cp=1cal/g DEG C of the specific heat of water, by optimizing cooling path, to control precipitation of the V element in cooling procedure in alloy, simultaneously also according to cold technique thinking is controlled, also separate out control cooling device for exploitation hot-rolled high-strength reinforcing bar and provide technical thought.

Description

A kind of precipitation Controlled cooling process of hot-rolled microalloy reinforcing bar
Technical field
The invention belongs to steel novel technique field, a kind of precipitation control of hot-rolled microalloy reinforcing bar is in particular, provided Cooling technique processed.
Background technology
It is known that vanadium topmost effect in steel is precipitation strength, while having certain Grain refinement.By Solution temperature is minimum in vanadium is microalloy element, therefore is easiest to complete at solid solution under relatively low billet heating temperature Reason, and obtain during roller repairing precipitating reinforcing effect.Vanadium is acted on for the prevention nuclear delay that ausforming is recrystallized, Well below the influence of niobium, therefore V-alloyed steel can use high temperature re-crystallization area I type controlled rollings, it is not necessary to increase considerably and roll Machine load, obtains certain crystal grain thinning effect.
Existing patent mainly considers that VN atomic ratios are controlled, and takes increasing vanadium, nitrogen pick-up and fixed nitrogen technique in smelting process, rolled Journey is taken reduction start rolling temperature and final rolling temperature and improved to ensure that fine grain, solid solution and precipitation hardening are realized in the big pressure of low temperature Intensity.
The content of the invention
It is an object of the invention to provide a kind of hot-rolled microalloy reinforcing bar and its precipitation Controlled cooling process.At home and abroad Controlled cooling process optimization has been carried out for precipitate on Research foundation, on the basis of original control V/N atomic ratios and controlled rolling, Increase the precipitate control of cooling procedure, promote V (C, N) disperse educt, reduce VC precipitation ratio, and avoid precipitate back dissolving With grow up, and then reach the purpose of crystal grain thinning；Developed simultaneously on hot-rolled reinforced bar production line and realize that the precipitation of the technique is cold But device.Also reference and reference are provided for the precipitation control of other steel grades.It is micro- that this Controlled cooling process is mainly control Precipitation of the V element in cooling procedure in alloy.Processing step and the technical parameter of control are as follows：
(1) percentage by weight for controlling hot-rolled microalloy reinforcing bar chemical composition is C：0.20%-0.25%, Si： 0.30%-0.60%, Mn：0.90%-1.40%, V：0.02-0.18%, N：50-300ppm Cr：0-0.25%, P≤ 0.035%, S≤0.040%, while control 0.5<Natom/Vatom<1.0, surplus is iron and inevitable impurity；
(2) it is common process to smelt continuous casting process, mainly control composition and field trash, provided for rolling meet GB will The qualified continuous casting billet asked；
(3) steel rolling production process is conventional heating furnace technology or direct-rolling process.Conventional heating furnace technology, billet heating temperature For 1100 DEG C -1150 DEG C, steel billet tapping temperature is 1050 DEG C -1100 DEG C, and start rolling temperature is 1000 DEG C -1100 DEG C, finishing temperature For 950 DEG C -1050 DEG C；Direct-rolling process, steel billet start rolling temperature is 950-1050 DEG C, and finishing temperature is 900 DEG C -1050 DEG C；
(4) reinforcing bar come out from mm finishing mill unit last rolling mill is run with 10~15m/s speed, and reinforcing bar temperature Quick cooling treatment is carried out on 900 DEG C~1050 DEG C of surfacesThe phase of water is made full use of in 1s to 3s Become the latent heat of vaporization Δ hv=540cal/g heat absorption general principles different with Cp=1cal/g DEG C of the specific heat of water, pass through water and water The vaporization of mist takes away a large amount of latent heats of vaporization, so as to be quickly cooled to MS＜ TC.F≤900℃。
(5) the piece-wise step type Controlled cooling process of temperature circulation is returned using rapid cooling-return temperature-rapid cooling-, degree controls out cooling section temperature Degree is in V (C, N) 550~900 DEG C of optimal Precipitation Temperature area；Suppress hot stage VC precipitation ratio and precipitation size, carry High VN ratio, the final upper cold bed of control returns temperature at 600~950 DEG C.
The present invention innovative point be：
(1) on the basis of original raising nitrogen content, control V/N atomic ratios, increase cooling procedure control promotes V (C, N) more Dissipate and separate out, improve VN precipitated phases percentage in VCN mixing precipitated phases, and avoid back dissolving, and then crystal grain thinning；
(2) promote V (C, N) precipitation, suppress hot stage VC precipitation ratio and precipitation size, improve VN ratio Example, and then greatly improve reinforcing effect；
(3) by process optimization, separate out cooling device for exploitation on hot-rolled reinforced bar production line and reference and reference are provided.
Brief description of the drawings
Fig. 1 is the bosher of the precipitation control cooling device for being used for hot-rolled microalloy high strength cast iron of patent of the present invention Skill path schematic diagram.
Embodiment
Patent is used for a kind of precipitation cooling technique of hot-rolled microalloy high strength cast iron to illustrate the invention, specific real The mode of applying illustrates as follows.
Embodiment 1：
(1) the internal control chemical composition of reinforcing bar 1 is tested：C 0.22%, Si 0.31%, Mn 1.36%, P 0.028%, S 0.021%th, Cr≤0.1%, V 0.034%, N≤150ppm；Fe surpluses.
(2) to carrying out hot rolling after 160 square casting blanks conventional heatings, rolling specs are Φ 25mm, and billet heating temperature is 1150 DEG C, steel billet tapping temperature is 1100 DEG C, and start rolling temperature is 1080 DEG C, and finishing temperature is 1070 DEG C；Finish to gauge speed 14m/s；
(3) using quick cooling after Controlled cooling process is rolled is separated out, Discrete control is cooled to after 772 DEG C through accelerating roller Cold bed returns temperature on road, and control returns temperature at 936 DEG C, and less than 200 DEG C progress bundling collections are then air-cooled on cold bed.
Water smoke gasification cooling technique surface temperature drop can reach 298 DEG C.Precipitations of the V in ferrite area is advantageously implemented, together When can stablize and improve yield strength and tensile strength about 20MPa.
Table 1 separates out Controlled cooling process parameter (mill speed V=14m/s)
Table 2 separates out the mechanical property (mill speed V=14m/s) of Controlled cooling process embodiment and comparative example
Sequence number R1l Rm A Agt Strong flexor ratio Bend ratio
Embodiment 1-1 489 659 22.4 12.6 1.35 1.22
Embodiment 1-2 488 665 23.2 13.0 1.36 1.22
Comparative example 1 466 642 21.6 14.7 1.38 1.17
Embodiment 2：
(1) the internal control chemical composition of reinforcing bar 1 is tested：C 0.24%, Si 0.29%, Mn 1.39%, P 0.028%, S 0.021%th, Cr≤0.1%, V0.034%, N≤150ppm；Fe surpluses.
(2) to carrying out hot rolling after 160 square casting blanks conventional heatings, rolling specs are Φ 25mm, and billet heating temperature is 1150 DEG C, steel billet tapping temperature is 1100 DEG C, and start rolling temperature is 1090 DEG C, and finishing temperature is 1073 DEG C；Finish to gauge speed 13m/s；
(3) using quick cooling after Controlled cooling process is rolled is separated out, Discrete control is cooled to after 730 DEG C through accelerating roller Cold bed returns temperature on road, and control returns temperature below 928 DEG C, and less than 200 DEG C progress bundling collections are then air-cooled on cold bed.
Water smoke gasification cooling technique surface temperature drop can reach 343 DEG C, be advantageously implemented precipitations of the V in ferrite area., together When can stablize and improve yield strength and tensile strength about 20~30MPa.
Table 3 separates out Controlled cooling process parameter (mill speed V=13m/s)
The embodiment of table 4 mechanical property (mill speed V=13m/s) corresponding with comparative example
Sequence number Rel Rm A Agt Strong flexor ratio Bend ratio
Embodiment 2-1 493 674 22.9 13 1.37 1.23
Embodiment 2-2 489 666 21.3 12 1.36 1.22
Comparative example 2 458 637 23.1 12 1.39 1.14
Embodiment 3：
1) the internal control chemical composition of reinforcing bar 1 is tested：C 0.23%, Si 0.32%, Mn 1.34%, P 0.02%, S 0.02%th, Cr≤0.06%, V 0.03%, N≤100ppm；Fe surpluses.
2) hot rolling is carried out to 150 side's continuous casting billets that direct-rolling process is produced, rolling specs are Φ 25mm, and steel billet start rolling temperature is 1020 DEG C, finishing temperature is 1000 DEG C；Finish to gauge speed 12.6m/s；
3) using quick cooling after Controlled cooling process is rolled is separated out, Discrete control is cooled to after 820 DEG C through accelerating roller Cold bed returns temperature on road, and control returns temperature at 930 DEG C, and less than 200 DEG C progress bundling collections are then air-cooled on cold bed.
The mechanical property contrast (mill speed V=12.6m/s) of the embodiment of table 5 and comparative example
Technique Rel/MPa Rm/MPa A/% Agt/% Strong flexor ratio Bend ratio
Embodiment 3-1 466 642 21.6 14.7 1.38 1.17
Embodiment 3-2 461 647 23.2 13 1.40 1.15
Comparative example 3 439 628 22.9 12 1.43 1.10
In summary, the invention discloses a kind of precipitation Controlled cooling process of hot-rolled microalloy reinforcing bar, by application, The utilization rate of V element is improved, and then the reinforcing effect of low cost can be obtained.The present invention is not limited only to V element, such as Nb, Ti, Cr Etc. can also be controlled with reference to this technique.

Claims (1)

1. a kind of precipitation Controlled cooling process of hot-rolled microalloy reinforcing bar, it is characterised in that：Processing step and the technology of control Parameter is as follows：
(1) percentage by weight for controlling chemical composition is：C：0.20%-0.25%, Si：0.30%-0.60%, Mn：0.90%- 1.40%, V：0.02-0.18%, N：50-300ppm Cr：0-0.25%, P≤0.035%, S≤0.040%, are controlled simultaneously 0.5<Natom/Vatom<1.0, surplus is iron and inevitable impurity.
(2) it is common process, control composition and field trash to smelt continuous casting process, and the qualified company for meeting Standard is provided for rolling Strand；
(3) steel rolling production process is conventional heating furnace technology or direct-rolling process.Conventional heating furnace technology, billet heating temperature is 1100 DEG C -1150 DEG C, steel billet tapping temperature is 1050 DEG C -1100 DEG C, and start rolling temperature is 1000 DEG C -1100 DEG C, and finishing temperature is 950℃-1050℃；Direct-rolling process, steel billet start rolling temperature is 950-1050 DEG C, and finishing temperature is 900 DEG C -1050 DEG C；
(4) reinforcing bar come out from mm finishing mill unit last rolling mill is run with 10~15m/s speed, and reinforcing bar temperature exists 900 DEG C~1050 DEG C of surface carries out VcoolingThe quick cooling treatments of >=100 DEG C/s, make full use of the phase transformation of water in 1s to 3s Heat absorption general principles different with Cp=1cal/g DEG C of the specific heat of water latent heat of vaporization Δ hv=540cal/g, passes through water and water smoke Vaporization take away a large amount of latent heats of vaporization, be cooled to MS＜ TC.F≤900℃；
(5) the piece-wise step type Controlled cooling process of temperature circulation is returned using rapid cooling-return temperature-rapid cooling-, degree is controlled out cooling section temperature and existed V (C, N) 550~900 DEG C of optimal Precipitation Temperature area；Suppress hot stage VC precipitation ratio and precipitation size, improve VN Ratio, the final upper cold bed of control returns temperature at 600~950 DEG C.
CN201710318534.2A 2017-05-08 2017-05-08 A kind of precipitation Controlled cooling process of hot-rolled microalloy reinforcing bar Active CN106957991B (en)

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
CN109355560A (en) * 2018-11-07 2019-02-19 钢铁研究总院 The complex intensifying cooling technique of hot-rolled microalloy reinforcing bar HRB500E
CN110541113A (en) * 2019-09-26 2019-12-06 江苏联峰实业有限公司 High-strength steel bar and production method thereof
CN110551945A (en) * 2019-10-10 2019-12-10 阳春新钢铁有限责任公司 optimization method of hot-rolled plain steel bar production process
CN110643886A (en) * 2019-10-15 2020-01-03 云南德胜钢铁有限公司 Low-alloy-ratio steelmaking method
CN110760757A (en) * 2019-08-14 2020-02-07 钢铁研究总院 Low-cost strengthening process of hot-rolled steel bar
CN113667899A (en) * 2021-09-03 2021-11-19 太原理工大学 Method for producing 700MPa grade high-strength steel by finely dispersing precipitated phase particles
CN113755762A (en) * 2021-09-18 2021-12-07 太原理工大学 Low-V microalloyed ultra-fine dispersion precipitated phase high-strength steel and preparation method thereof

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103643143A (en) * 2013-11-20 2014-03-19 江苏天舜金属材料集团有限公司 600MPa-grade green-heat-treatment high-strength steel bar and processing method thereof
CN104550275A (en) * 2014-12-26 2015-04-29 钢铁研究总院 Method and device for spray evaporation cooling of hot-rolled high-strength rebar
CN105401070A (en) * 2015-12-18 2016-03-16 首钢水城钢铁（集团）有限责任公司 Production method of finish rolling twisted steel for prestressed concrete
CN105886902A (en) * 2016-06-12 2016-08-24 河北钢铁股份有限公司承德分公司 400MPa-level vanadium-containing anti-seismic anti-corrosion rebar and production method thereof

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103643143A (en) * 2013-11-20 2014-03-19 江苏天舜金属材料集团有限公司 600MPa-grade green-heat-treatment high-strength steel bar and processing method thereof
CN104550275A (en) * 2014-12-26 2015-04-29 钢铁研究总院 Method and device for spray evaporation cooling of hot-rolled high-strength rebar
CN105401070A (en) * 2015-12-18 2016-03-16 首钢水城钢铁（集团）有限责任公司 Production method of finish rolling twisted steel for prestressed concrete
CN105886902A (en) * 2016-06-12 2016-08-24 河北钢铁股份有限公司承德分公司 400MPa-level vanadium-containing anti-seismic anti-corrosion rebar and production method thereof

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
CN109355560A (en) * 2018-11-07 2019-02-19 钢铁研究总院 The complex intensifying cooling technique of hot-rolled microalloy reinforcing bar HRB500E
CN110760757A (en) * 2019-08-14 2020-02-07 钢铁研究总院 Low-cost strengthening process of hot-rolled steel bar
CN110760757B (en) * 2019-08-14 2021-12-03 钢铁研究总院 Low-cost strengthening process of hot-rolled steel bar
CN110541113A (en) * 2019-09-26 2019-12-06 江苏联峰实业有限公司 High-strength steel bar and production method thereof
CN110551945A (en) * 2019-10-10 2019-12-10 阳春新钢铁有限责任公司 optimization method of hot-rolled plain steel bar production process
CN110551945B (en) * 2019-10-10 2020-04-14 阳春新钢铁有限责任公司 Optimization method of hot-rolled plain steel bar production process
CN110643886A (en) * 2019-10-15 2020-01-03 云南德胜钢铁有限公司 Low-alloy-ratio steelmaking method
CN113667899A (en) * 2021-09-03 2021-11-19 太原理工大学 Method for producing 700MPa grade high-strength steel by finely dispersing precipitated phase particles
CN113667899B (en) * 2021-09-03 2022-07-19 太原理工大学 Method for producing 700MPa grade high-strength steel by finely dispersing precipitated phase particles
CN113755762A (en) * 2021-09-18 2021-12-07 太原理工大学 Low-V microalloyed ultra-fine dispersion precipitated phase high-strength steel and preparation method thereof

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