CN105945248B - A kind of creep bending creep straightening method of straight mold type caster - Google Patents

A kind of creep bending creep straightening method of straight mold type caster Download PDF

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CN105945248B
CN105945248B CN201610446471.4A CN201610446471A CN105945248B CN 105945248 B CN105945248 B CN 105945248B CN 201610446471 A CN201610446471 A CN 201610446471A CN 105945248 B CN105945248 B CN 105945248B
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creep
straightening
continuous casting
bending
casting billet
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CN105945248A (en
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张兴中
郭龙
张赫鑫
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Yanshan University
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Yanshan University
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/12—Accessories for subsequent treating or working cast stock in situ
    • B22D11/128—Accessories for subsequent treating or working cast stock in situ for removing
    • B22D11/1282—Vertical casting and curving the cast stock to the horizontal
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/12—Accessories for subsequent treating or working cast stock in situ
    • B22D11/1226—Accessories for subsequent treating or working cast stock in situ for straightening strands
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/16—Controlling or regulating processes or operations
    • B22D11/20—Controlling or regulating processes or operations for removing cast stock

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)

Abstract

The invention discloses a kind of creep bending creep straightening method of straight mold type caster, its content is：Determine yield stress σ of the continuous casting billet material in bending section to straightening section temperature ranges, the constant stress σ that continuous casting billet material carries out high-temerature creep tension test is chosen, makes σ<σs, determine continuous casting billet material in a certain temperature and less than yield stress σsIn the case of minimized creep strain rate；According to thickness of strand D and permissible ε0According to the casting machine of straight mold type caster type height, metallurgical length and casting speed technological parameter, bending section curvature variation is set to be higher than straightening section curvature variation, shorten basic arc section arc length, increase continuous casting billet creep time, make continuous casting billet in the time progress deformation of creep for bending with having abundance in straightening process；Suitable type curve is chosen, continuous casting billet, less than the minimized creep strain rate that experiment determines, so that the deformation of creep occurs less than the state of yield stress, is finally realized the creep bending and creep straightening of continuous casting billet in the strain rate of bending section and straightening section.

Description

A kind of creep bending creep straightening method of straight mold type caster
Technical field
The invention belongs to continuous casting steel machine field, the creep bending creep straightening side of more particularly to a kind of straight mold type caster Method.
Background technology
Continuous casting billet bending straightening technology is the key technology in continuous casting of iron and steel production.The bending straightening mistake of straight mold type caster Journey refer to continuous casting billet under outer moment loading from bending vertically, the continuous casting billet then with certain curvature radius is again by rectifying Straight torque becomes horizontal process.Along with the development of current high-efficient continuous casting technology, the bending straightening method of continuous casting billet is also from list Point bending, single-point aligning progressively develop into multi-point bending, multipoint straightening, progressive bending, progressive straightening, continuous bend and continuously rectified It is straight etc..The bending straightening technology of continuous casting billet improves slab quality and production efficiency is most important for avoiding cracking.
Current domestic straight mold type caster use is very universal, uses multi-point bending multipoint straightening technology mostly, in recent years Some newly-built conticasters generally employ continuous bend continuous straightening technology, and no matter which kind of straightening technology is considered to continuous casting billet Bending straightening deformation must reach plastic yielding condition, i.e. bending straightening torque is more than plastic moment, and bending straightening stress is big The mass defects such as strand is cracked are likely to result in the plastic deformation of yield stress, but bending straightening process.Straight arc Conticaster is when designing bending section, more based on straightening section, considers using bending as the reverse situation of aligning, bending section and strong Straight section use deformation principle it is identical, but due to continuous casting billet bending section temperature apparently higher than straightening section temperature, it is existing Design method and do not give full play to the croop property of material.In addition, straight mold type caster has very long circular arc mostly Section, this section of arc section can't make continuous casting billet deform, and bending section and straightening section arc length are relatively short, cause continuous casting billet becoming Shape area strain rate is big, the probability that increase crackle occurs.
It is therefore proposed that a kind of creep bending creep straightening method for straight mold type caster, by continuous casting billet material High-temerature creep deforms, and is reasonably distributed and extends bending section arc length and straightening section arc length, makes continuous casting billet in whole type roller-way The middle increase deformation of creep time, the deformation of creep fully occurs without being plastically deformed in bending section and straightening section section, can be with Bending straightening torque and bending straightening stress are reduced, so as to reduce the risk of crackle appearance, improves the quality of strand.
The content of the invention
The present invention provides a kind of creep bending creep straightening method of straight mold type caster, its technical problems to be solved It is：According to continuous casting billet material at high temperature creep properties, make continuous casting billet fast in bending section deformation, it is slow in straightening section deformation, rational point Cloth and extension bending section arc length and straightening section arc length, shorten basic arc section arc length, make strand stress when bending straightening deforms Respectively less than yield stress, it is not plastically deformed, creep bending and creep straightening is carried out by the deformation of creep, can be with Crack prevention Generation, improve the quality of strand.
To solve the above problems, the technical proposal of the invention is realized in this way：A kind of creep of straight mold type caster is curved Bent creep straightening method, this method content comprise the following steps：
1st, yield stress σ of the continuous casting billet material in bending section to straightening section temperature range is determineds, choose continuous casting billet material and enter The constant stress σ of row high-temerature creep tension test, makes σ<σs, it is then determined that continuous casting billet material is in a certain temperature and less than yield stress σsIn the case of minimized creep strain rate
2nd, according to thickness of strand D and permissible ε0, by formulaDetermine the basic arc radius of conticaster R0, reasonably had according to the casting machine of straight mold type caster type height, metallurgical length and casting speed process parameters design low The bending section curve and straightening section curve of curvature variation, give full play to continuous casting billet material at high temperature croop property, and reasonable distribution is curved The curvature and arc length of tune and straightening section, bending section curvature variation is higher than straightening section curvature variation, shorten basic circular arc Section arc length, increases continuous casting billet creep time, continuous casting billet is being bent and is being had the sufficient time to carry out the deformation of creep in straightening process；
3rd, suitable type curve is chosen, makes what continuous casting billet determined in the strain rate of bending section and straightening section less than experiment Minimized creep strain rateNow continuous casting billet suffered stress in bending straightening deformation process is less than yield stress, with less than The deformation of creep occurs for the state of yield stress, and whole bending straightening process is not plastically deformed, and finally realizes the compacted of continuous casting billet Buckle and creep straightening.
Compared with prior art, the present invention has advantages below：
(1) continuous casting billet by the deformation of creep, is not plastically deformed, bending straightening in bending straightening deformation process Stress is consistently lower than yield stress, reduces possibility caused by crackle；
(2) bending section arc length and straightening section arc length are extended, basic arc section arc length is substantially reduced, makes continuous casting billet whole The deformation of creep time is added in individual roller row, bending section and straightening section roller row are arranged with different curvature variations respectively, filled Divide the high temperature creep property that make use of material；
(3) the bending section arc length of straight mold type caster creep bending creep straightening method and straightening section arc length make continuous casting billet should Variable Rate is lower, is advantageous to improve continuous casting billet quality, good adapts to the higher casting speed of continuous casting billet.
Brief description of the drawings
Fig. 1 is 1200 DEG C of creep strains and creep strain rate diagram；
Fig. 2 is tradition 5 points of bendings, 5 straightening technology type curve maps；
Fig. 3 is creep bending creep straightening technology type curve map；
Fig. 4 is that strain rate is schemed with creep strain RATES.
Embodiment
Below in conjunction with the accompanying drawings, technical scheme is further described in detail.Described embodiment is only The section Example of the present invention.
First, continuous casting billet material selection Q345C, the crackle occurred by bending straightening due to continuous casting billet are all internally, actual In production continuous casting billet during bending straightening surface temperature all more than 1000 DEG C, therefore using from 1200 DEG C as refer to. Pass through 1200 DEG C of constant strain speed 0.01S-1Tension test is carried out, the yield stress measured at this temperature is 16.20MPa, so Tension test is carried out at 1200 DEG C with constant stress 14MPa afterwards, measures creep curve and creep speed of the material at 1200 DEG C Rate curve, it is 1200 DEG C of creep strains and creep strain rate diagram shown in Fig. 1, the material is at 1200 DEG C as can be seen from Figure 1 Minimum creep rate be 7.45 × 10-5S-1。
It is tradition 5 points of bendings, 5 straightening technology type curve maps shown in Fig. 2, with reference to 5 points of bendings of R9300mm in figure 2 The straight mold type caster process of 5 points of aligning type curves, thickness of strand 230mm, pulling rate 1.5m/min, conticaster are high Spend 12305.55mm, metallurgical length 35.8m, vertical section arc length 1465mm, bending section CD arc length 1030mm, basic arc section BC arcs Long 13300mm, straightening section AB arc length 1520mm.For conticaster thickness of strand 230mm, according to permissible ε0For 1.5% to 2%, 1.5% is taken, then basic arc radius R07666mm is should be greater than, takes basic arc radius R0For 8000mm.Fig. 3 institutes Show it is creep bending creep straightening technology type curve map, from the new architecture curve of Fig. 3 mean curvature sinusoidal variations, wherein bending Section CD arc length 8000mm, basic arc section BC arc length 1920.8mm, straightening section AB arc length 10000mm, curve is relative to arc length Governing equation is：
L is bending section or the total arc length of straightening section in formula, according to corner and the relation of curvature, draws curvilinear corner and arc length Governing equation is：
Curve parametric equation expression formulas of the straightening section AB under XOY coordinate systems be：
Curve parametric equation expression formulas of the bending section CD under X ＇ O ＇ Y ＇ coordinate systems be：
Wherein s is curve arc long, mm.
The slope that bending section end point can be calculated by slope tan α (s) is 0.7393 and straightening section starting point Slope is 1.0210, and due to two curves, in design, initial coordinate system is different, is translated and rotated by reference axis, uniform coordinate The slope of the lower bending section end point of system is 1.3526, and bending section can not be smoothly connected with straightening section, and transition circle segmental arc is chosen in centre, Radius R0For 8000mm, central angle -0.7393rad is originated, terminates central angle -0.9794rad, will can be rectified by transition circle segmental arc Straight section curve and bending section line smoothing connecting without mutation.For type curve in Fig. 3 to the bending straightening of continuous casting billet Strain is calculated, and due to continuous casting billet, outer arc side tension is easily cracked in BENDING PROCESS, takes neutral line deviation outer arc side 1200 DEG C of positions calculate strain inside continuous casting billet；Continuous casting billet inner arc side tension in straightening process is easily cracked, takes neutrality 1200 DEG C of positions calculate strain rate inside the continuous casting billet of layer deviation inner arc side.Strain rate in this position should with minimum creep Variable Rate contrasts as shown in Figure 4, as can be seen from Figure 4 makes continuous casting billet should according to the roller row of type arrangement of curves shown in Fig. 3 Variable Rate is lower, and variation tendency meets sinusoidal rule.The bending section strain rate maximum of middle new architecture curve shown in Fig. 4 For 7.3 × 10-5S-1, straightening section strain rate maximum is 3.7 × 10-5S-1, it can be seen that continuous casting billet is curved in new architecture curve Tune is faster than straightening section deformation, and this also complies with the fast rule of the high creep of material temperature, can give full play to the height of continuous casting billet material Warm croop property, and the maximum of strain rate is respectively less than minimum creep strain speed, and continuous casting billet is in whole running In realize creep bending and creep straightening, it was demonstrated that the feasibility of this method.

Claims (1)

1. a kind of creep bending creep straightening method of straight mold type caster, it is characterised in that：This method content includes following step Suddenly：
(1) yield stress σ of the continuous casting billet material in bending section to straightening section temperature range is determineds, choose continuous casting billet material and carry out height The constant stress σ of warm creep tension test, makes σ<σs, it is then determined that continuous casting billet material is in a certain temperature and less than yield stress σsFeelings Minimized creep strain rate under condition
(2) according to thickness of strand D and permissible ε0, by formulaDetermine the basic arc radius R of conticaster0, Low curvature is reasonably had according to the casting machine of straight mold type caster type height, metallurgical length and casting speed process parameters design The bending section curve and straightening section curve of rate of change, give full play to continuous casting billet material at high temperature croop property, reasonable distribution bending section With the curvature and arc length of straightening section, bending section curvature variation is higher than straightening section curvature variation, shorten basic arc section arc It is long, increase continuous casting billet creep time, continuous casting billet is being bent and is being had the sufficient time to carry out the deformation of creep in straightening process；
(3) suitable type curve is chosen, continuous casting billet is determined most less than experiment in the strain rate of bending section and straightening section Small creep strain speedNow continuous casting billet suffered stress in bending straightening deformation process is less than yield stress, with less than in the wrong The deformation of creep occurs for the state for taking stress, and whole bending straightening process is not plastically deformed, and finally realizes the creep of continuous casting billet Bending and creep straightening.
CN201610446471.4A 2016-06-21 2016-06-21 A kind of creep bending creep straightening method of straight mold type caster Active CN105945248B (en)

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CN112059129A (en) * 2020-07-15 2020-12-11 金龙精密铜管集团股份有限公司 Production method of low-alloy-content copper pipe

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EP0920938A1 (en) * 1997-12-05 1999-06-09 Sms Schloemann-Siemag Aktiengesellschaft Method and continuous casting facility for producing thin slabs
CN1325330A (en) * 1998-11-06 2001-12-05 奥地利钢铁联合企业阿尔帕工业设备制造公司 Method for continuously casting metal and continuous casting installation provided thereof
CN1528545A (en) * 2003-09-26 2004-09-15 燕山大学 Roll curve of continuous caster with continuous bending section and two continuous straightening sections
CN102527970A (en) * 2011-10-31 2012-07-04 中冶南方工程技术有限公司 Coordinate computing method for continuous bending roller rows and straightening section roller rows of slab casting machine
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EP0920938A1 (en) * 1997-12-05 1999-06-09 Sms Schloemann-Siemag Aktiengesellschaft Method and continuous casting facility for producing thin slabs
CN1325330A (en) * 1998-11-06 2001-12-05 奥地利钢铁联合企业阿尔帕工业设备制造公司 Method for continuously casting metal and continuous casting installation provided thereof
CN1528545A (en) * 2003-09-26 2004-09-15 燕山大学 Roll curve of continuous caster with continuous bending section and two continuous straightening sections
CN102527970A (en) * 2011-10-31 2012-07-04 中冶南方工程技术有限公司 Coordinate computing method for continuous bending roller rows and straightening section roller rows of slab casting machine
CN104384468A (en) * 2014-12-15 2015-03-04 上海耀秦冶金设备技术有限公司 Continuous bending/straightening roll array curve of plate billet/square billet continuous casting machine

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