CN105177411A - Boracic cold-rolled enamel steel suitable for continuous annealing production and manufacturing method of boracic cold-rolled enamel steel - Google Patents
Boracic cold-rolled enamel steel suitable for continuous annealing production and manufacturing method of boracic cold-rolled enamel steel Download PDFInfo
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- CN105177411A CN105177411A CN201510479731.3A CN201510479731A CN105177411A CN 105177411 A CN105177411 A CN 105177411A CN 201510479731 A CN201510479731 A CN 201510479731A CN 105177411 A CN105177411 A CN 105177411A
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Abstract
The invention relates to boracic cold-rolled enamel steel suitable for continuous annealing production and a manufacturing method of the boracic cold-rolled enamel steel. The steel comprises, by mass, the chemical components of 0.03%-0.05% of C, 0.02% of Si or less, 0.20%-0.40% of Mn, 0.020% of P or less, 0.020%-0.035% of S, 0.020%-0.07% of Als, 0.0010%-0.0020% of B, 0.0020%-0.0060% of N and the balance Fe and inevitable impurities. The boracic cold-rolled enamel steel can be used for thin-specification water heater inner containers and decoration panels of subways and tunnels; the yield strength is 200-240 MPa, the tensile strength is 290-340 MPa, the ductility is 38%-44%, the value n of the hardening exponent is larger than 0.20, the value r<m> of the mean plastic strain ratio is larger than 1.6, and the hydrogen retardation time of a steel plate with the thickness of 1 mm is larger than 50 min; and fish scaling is avoided after enameling, and the enamel adherence performance can meet the national standard.
Description
Technical field
The present invention relates to Glassed Steel and manufacturing process thereof, specifically the cold rolling Glassed Steel of boracic produced of a kind of suitable continuous annealing and manufacture method thereof, this steel can be applicable to the decoration panel in Thin Specs water heater liner and subway, tunnel.
Background technology
Glassed Steel combines the advantage of the corrosion-resistant and easy decoration of the intrinsic obdurability of ferrous materials and workability and stupalith, is widely used in the industries such as light industry, household electrical appliances, chemical industry, building.
At household electrical appliances and building field, less demanding to the deep drawing formability of Glassed Steel, and require higher to intensity and anti-enamel firing deformability.Due to water heater liner Glassed Steel and architectural decoration board with enamel panel layer plate face larger, therefore require that Glassed Steel has higher heat acclimation performance, namely rear intensity fired by high temperature deformation resistance ability and higher high-temperature tubring, and requiring more than 800 DEG C high-temperature tubrings to fire, rear product is indeformable and intensity is higher.
Current domestic associated mechanisms is carried out for hot rolling Glassed Steel and ultra-low carbon cold-rolling Glassed Steel mostly to the production of Glassed Steel and research, add the alloying elements such as Nb, V, Ti or RE, utilize carbonitride to form " hydrogen trap " to ensure fish scaling resistance as the second phase particles of disperse.Ultra-low carbon cold-rolling Glassed Steel increases Ti content usually, utilizes the compound of Ti, as TiN, TiS, Ti
4c
2s
2with the Second Phase Precipitation such as Ti (C, N) as hydrogen trap to improve the fish scaling resistance of steel plate, and less to the application of boron micro-alloyed Glassed Steel.No matter trace B element (10-30ppm) is to being that hot rolling or the cold rolling equal tool of soft steel performance improve a lot, its cost of alloy is lower, trace adds can the fish scaling resistance of raising Glassed Steel by a relatively large margin and comprehensive mechanical property, is especially suitable for high temperature continuous annealing process and produces.In order to improve fish scaling resistance, the production of current most of cold rolling Glassed Steel adopts bell-type annealing technique, and abandons the higher continuous annealing of production efficiency, and continuous annealing product performance stability is strong, more adapts to modern production.Further, the soft steel of high temperature continuous annealing process production is stronger than the cold-reduced sheet high-temperature stability of hot-rolled sheet and bell-type annealing.And adopt the production practice of the cold rolling low-carbon (LC) Glassed Steel of continuous annealing process still fewer.
Therefore, need a kind of employing low-carbon (LC), add trace B alloying, be suitable for the cold rolling Glassed Steel that continuous annealing process is produced, this kind of Glassed Steel has low cost, high performance feature, especially there is certain intensity and stronger high temperature deformation resistance, be suitable for producing water heater liner and large format building decoration board with enamel panel layer.
Summary of the invention
The object of the present invention is to provide a kind of low-alloy cost, be applied to the cold rolling Glassed Steel of boracic of water heater liner and building decoration panel.This kind of cold rolling Glassed Steel is suitable for continuous annealing process and produces; Microtexture, to wait axle ferrite, also has the cementite particle of Dispersed precipitate in a small amount of perlite and crystal grain; Steel plate yield strength 200-240MPa, tensile strength 290-340MPa, unit elongation 38-44%, work hardening exponent
nvalue is greater than 0.20, average plastic strain ratio
r mvalue is greater than 1.6,1mm Plate Steel hydrogen and is greater than 50min retardation time, squama does not occur quick-fried after enamel, the requirement that enamel adhesion property is up to state standards.
For achieving the above object, the present invention adopts following technical scheme:
The cold rolling Glassed Steel of boracic that suitable continuous annealing is produced, the chemical composition mass percent of this kind of Glassed Steel is: C:0.03-0.05%; Si≤0.02%; Mn:0.20-0.40%; P≤0.020%; S:0.020-0.035%; Als:0.020-0.07%; B:0.0010-0.0020%; N:0.0020-0.0060%; Surplus is Fe and inevitable impurity element.
The chemical composition mass percent of this kind of Glassed Steel optimum is: C:0.045%, Si≤0.01%, Mn:0.25-0.30%, P≤0.010%, S:0.025%, Als:0.030-0.05%, B:0.0012%, N:0.0030-0.0050%; Surplus is Fe and inevitable impurity element.
Another goal of the invention of the present invention is to provide the manufacture method of this kind of Glassed Steel, and the method comprises: hot metal pretreatment, converter smelting, refining, and continuous casting becomes slab, and continuously cast bloom heats, and hot continuous rolling, batches, pickling, cold continuous rolling, and continuous annealing is smooth, finishing; Wherein, continuous blank heating temperature controls at 1200-1250 DEG C; Finishing temperature control is at 860-930 DEG C; Oiler temperature control is at 680-740 DEG C; Cold rolling draft 70-80%; Continuous annealing process comprises heating and thermal insulation and follow-up Wetted constructures, holding temperature 830-870 DEG C, isothermal time 40-120s, Wetted constructures temperature 350-450 DEG C, time 180-300s, smooth unit elongation 0.5-1.2%.
The main technologic parameters of the method optimum is: continuous blank heating temperature 1200 DEG C; Finishing temperature control 910 DEG C; Oiler temperature control 710 DEG C; Cold rolling draft 80%; Continuous annealing holding temperature 830 DEG C, isothermal time 60s, Wetted constructures temperature is slow cooling to 350 DEG C by 450 DEG C, time 300s; Smooth unit elongation 0.8%.
The mechanism of action of each alloying constituent and main technologic parameters in the present invention:
Glassed Steel needs to consider application target, the production technique of enamel enterprise and manufacturing condition in design.Therefore, Glassed Steel should consider multiple requirements on Composition Design, as mechanical property, forming property, fish scaling resistance, the non-deformability of steel plate in enamel sintering procedure and the withstand voltage properties etc. after enamel.Composition is the basis of ferrous materials performance quality, when producing cold rolling Glassed Steel, to the strict control of composition and the mechanism of action understanding of heterogeneity to performance most important.
C:0.03-0.05%, C of the present invention are strengthening elements the most general in steel, and C makes intensity increase, and plasticity declines.For needs cold-stamped steel, yield strength is unsuitable too high, needs certain unit elongation.Therefore, C content is usually lower, is generally less than 0.1wt.%, and the C content of deep drawing steel is not more than 0.04wt.%, and the C content of extra-deep drawing steel is then not more than 0.006wt.%.N and C is similar, generally makes intensity increase in steel, and hardness rises, and plasticity declines and causes timeliness.If improper process control, N meeting and Ti, Al etc. form the inclusion of band wedge angle, and this is very disadvantageous for the stamping of steel plate.Carbonitride in steel, perlite, cementite can be used as hydrogen trap and improve fish scaling resistance.Therefore, for the cold rolling Glassed Steel of this invention, for ensureing that rear intensity fired by necessary fish scaling resistance, cold formability and high temperature deformation resistance and enamel, the content of C, N will strictly control.
Als:0.020-0.07%, Al of the present invention generally add as reductor in steel, are dissolved in the oxygen in molten steel when oxygen blast smelting is mainly removed in effect.In addition, Al can be combined with N, reduces the solid solution content of N in ferrite, reduces strain aging, improves cold plasticity.For the Glassed Steel not adding the microalloy elements such as Nb, V, Ti, AlN can be used as available hydrogen trap.
S:0.020-0.035%, S of the present invention harmful element normally in steel, if but containing enough Mn in steel, then S forms MnS at steel grade usually, and its damaging effect can be made significantly to reduce.For Glassed Steel, for reducing cost of alloy, can suitably improving S, Mn content, utilizing MnS as being hydrogen trap.
P≤0.020% of the present invention, P can increase the fragility of steel, but P is again a kind of very effective element of hardness of steel of raising, for soft steel suitable add P, the high tensile steel plate that deep drawing formability is excellent can be produced.But the general impacts of P to steel plasticity are, along with the increase of P content in steel, intensity increases, unit elongation,
nvalue and
rbe worth on a declining curve.
B:0.0010-0.0020% of the present invention, the Main Function of B in phase transformation strengthening steel improves hardening capacity, and the solubleness of B in steel is very little, and general add-on is little, but produce the hardness of steel and have a great impact, B weakens with the increase of C content gradually to hardness stiffening effect.Therefore B is the most effective in soft steel, is also widely used at medium carbon steel.The interpolation of B also has good effect can improve the hot strength of steel to low alloy steel, strengthening crystal boundary.B element aboundresources, low price.Add the alloying element that micro-B element significantly can save other costliness in steel, have considerable economic benefit.Trace B can improve the mechanical property of steel to a great extent, can also improve the hot and cold processing characteristics of steel simultaneously.B, N segregation at crystal boundary, phase interface place significantly can increase quantity and the usefulness of the hydrogen trap in Glassed Steel.
The impact of main technologic parameters of the present invention:
Heating of plate blank: hot rolling slab heating and temperature control, at 1200-1250 DEG C, can make the abundant austenitizing of steel billet at this temperature, make most alloying element fully dissolve simultaneously, for the tissue obtaining even refinement is prepared.
Hot-rolled temperature controls: finishing temperature control, at 860-930 DEG C, ensures there are enough distortion in austenite cold zone, avoids the distortion in two-phase region to obtain mixed crystal simultaneously, makes hot-rolled sheet obtain the tissue of even refinement.Coiling temperature, built in 680-740 DEG C, makes perlite, cementite fully separates out, obtain relatively large the pearlite colony.
Cold rolling: cold rolling draft controls at 70-80%, the performance of cold rolling draft to steel plate has considerable influence.First, cold deformation affects the annealing recrystallization of steel plate, affects grain-size, and then affects the mechanical properties.Secondly, cold deformation affects deformation texture and the recrystallization texture of steel plate, and then impact
rvalue and forming property.Finally, cold deformation affects perlite, cementite form, and then affects hydrogen trap quantity and fish scaling resistance.
Continuous annealing: annealing process adopts holding temperature 800-870 DEG C, isothermal time 40-120s, Wetted constructures temperature 350-450 DEG C, time 180-300s continuously.The cold rolled annealed steel plate tissue that makes obtains further refinement, obtains recrystallization texture, changes perlite and cementite form.Adopt heating and thermal insulation to coordinate the continuous annealing of overaging, both can obtain the relatively uniform ferritic structure waiting axle, γ recrystallization texture is attained full development, obtains the degenerate perlite of disperse, a large amount of cementite particle is separated out in crystal grain.The mechanical property of steel plate, forming property, fish scaling resistance are all improved.
Smooth: smooth unit elongation 0.5-1.2%.To steel plate carry out slightly thinning cold pressing under, eliminate the yield point elongation that steel plate exists after recrystallization annealing, improve planeness, eliminate discontinuous viscous deformation, improve surface quality.
Adopt the present invention of technique scheme, compared with prior art, there is following innovation:
(1) Glassed Steel cost of alloy of the present invention is lower, does not almost have difference with common low carbon cold punching plate composition, only adds trace B element.By technology controlling and process, give full play to alloys producing, obtain desirable microtexture state, mechanical property, forming property, fish scaling resistance obtain remarkable improvement.
(2) Glassed Steel continuous annealing plate microtexture of the present invention is to wait axle ferrite, steel plate yield strength 200-240MPa, tensile strength 290-340MPa, unit elongation 38-44%, work hardening exponent
nvalue is greater than 0.20, average plastic strain ratio
r mvalue is greater than 1.6, has higher comprehensive mechanical property.
(3) have the degenerate perlite of some amount between Glassed Steel annealed sheet ferrite crystal grain with three-phase infall, in crystal grain, Dispersed precipitate a large amount of cementite particle; B and N combines main in crystal boundary, phase interface place segregation, and quantity and the effect of the hydrogen trap in steel are significantly strengthened.1mm Plate Steel hydrogen is greater than 50min retardation time, and squama does not occur quick-fried after enamel, enamel adhesion property is up to state standards.
(40 Glassed Steels of the present invention are suitable for adopting the allegro continuous annealing of high temperature to produce.Because boron segregation characteristic in steel is comparatively strong, the effect that it promotes to separate out in cementite crystal grain can be given full play under continuous annealing process.Further, continuous annealing tissue hyperthermia stability is strong, and anti-enamel firing deformability is strong, and after enamel firing, armor plate strength change is little.
Accompanying drawing explanation
Fig. 1 is the metallurgical tissue picture of Glassed Steel continuous annealing plate prepared by the embodiment of the present invention 1;
Fig. 2 is the metallurgical tissue picture of Glassed Steel continuous annealing plate prepared by the embodiment of the present invention 2;
Fig. 3 is the metallurgical tissue picture of Glassed Steel continuous annealing plate prepared by the embodiment of the present invention 3;
Fig. 4 is the metallurgical tissue picture of the Glassed Steel continuous annealing plate of comparative example 1 of the present invention preparation;
Fig. 5 is the cementite particle picture in the Glassed Steel continuous annealing plate of the embodiment of the present invention 1 preparation in ferrite crystal grain;
Fig. 6 is MnS picture spherical in the Glassed Steel continuous annealing plate of the embodiment of the present invention 1 preparation.
Embodiment
Below in conjunction with example, the invention will be further described, and object is only better to understand content of the present invention, the cited case unrestricted right of the present invention.
The chemical composition (mass percent) of embodiments of the invention and comparative example is in table 1:
Table 1
The main production parameter of the embodiment of the present invention and comparative example is in table 2:
Table 2
The production stage of each embodiment and comparative example is as follows:
1. hot metal pretreatment, converter smelting, refining, cast blank;
2. heating of plate blank, heating and temperature control is at 1200-1250 DEG C;
3. hot continuous rolling, batch, finishing temperature control is at 860-930 DEG C, and oiler temperature control is at 680-740 DEG C;
4. pickling, cold continuous rolling, cold rolling draft 70-80%;
5. continuous annealing, holding temperature 800-870 DEG C, isothermal time 40-120s, Wetted constructures temperature 350-450 DEG C, time 180-300s.
6. smooth, finishing, smooth unit elongation 0.5-1.2%.
The comprehensive mechanical property of the embodiment of the present invention and comparative example is as table 3:
Table 3
The enamel conformability of the embodiment of the present invention and comparative example is as table 4:
Table 4
Adopt electrochemical hydrogen permeation method, sample is the rectangular steel plates of 1.0mm × 50mm × 80mm.Sand papering, electro-anatomical light and one side plating Ni.Subject part is made up of two electrolyzers, is connected and separate between electrolyzer by steel plate sample, and hydrogen diffuses to the one side of plating Ni via steel plate one side, detects and is scaled permeation flux, until reach stable state through instrument.
Adopt wet method to be coated with pool technique, 880 DEG C of enamel firings, place one month, and the squama of inspection steel plate is quick-fried.By the falling-ball impact test of national standard GB/T 7990-2013, the enamel adhesion property of inspection enameling sheet, impacts board with enamel panel layer surface with 110g steel ball.
Claims (4)
1. the cold rolling Glassed Steel of boracic of suitable continuous annealing production, is characterized in that: the chemical composition mass percent of this kind of Glassed Steel is: C:0.03-0.05%; Si≤0.02%; Mn:0.20-0.40%; P≤0.020%; S:0.020-0.035%; Als:0.020-0.07%; B:0.0010-0.0020%; N:0.0020-0.0060%; Surplus is Fe and inevitable impurity element.
2. the cold rolling Glassed Steel of boracic of suitable continuous annealing production as claimed in claim 1, it is characterized in that: the chemical composition mass percent of this kind of Glassed Steel is: C:0.045%, Si≤0.01%, Mn:0.25-0.30%, P≤0.010%, S:0.025%, Als:0.030-0.05%, B:0.0012%, N:0.0030-0.0050%; Surplus is Fe and inevitable impurity element.
3. a manufacture method for the cold rolling Glassed Steel of boracic of suitable continuous annealing production as claimed in claim 1, it is characterized in that: comprising: hot metal pretreatment, converter smelting, refining, continuous casting becomes slab, continuously cast bloom heats, and hot continuous rolling, batches, pickling, cold continuous rolling, continuous annealing, smooth, finishing; Wherein, continuous blank heating temperature controls at 1200-1250 DEG C; Finishing temperature control is at 860-930 DEG C; Oiler temperature control is at 680-740 DEG C; Cold rolling draft 70-80%; Continuous annealing process comprises heating and thermal insulation and follow-up Wetted constructures, holding temperature 830-870 DEG C, isothermal time 40-120s, Wetted constructures temperature 350-450 DEG C, time 180-300s, smooth unit elongation 0.5-1.2%.
4. the manufacture method of the cold rolling Glassed Steel of boracic of suitable continuous annealing production as claimed in claim 3, is characterized in that: continuous blank heating temperature 1200 DEG C; Finishing temperature control 910 DEG C; Oiler temperature control 710 DEG C; Cold rolling draft 80%; Continuous annealing holding temperature 830 DEG C, isothermal time 60s, Wetted constructures temperature is slow cooling to 350 DEG C by 450 DEG C, time 300s; Smooth unit elongation 0.8%.
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| CN107868908A (en) * | 2017-11-03 | 2018-04-03 | 马鞍山钢铁股份有限公司 | A kind of deep-draw two-sided dust coat cold rolling glassed steel and production method |
| CN110273106A (en) * | 2019-07-30 | 2019-09-24 | 马鞍山钢铁股份有限公司 | A kind of 260MPa grades of cold-rolling continuous annealing glassed steel and its production method |
| CN110777301A (en) * | 2018-07-30 | 2020-02-11 | 宝山钢铁股份有限公司 | Cold-rolled enamel steel and manufacturing method thereof |
| CN111074140A (en) * | 2017-12-27 | 2020-04-28 | 柳州钢铁股份有限公司 | Method for manufacturing cold-rolled low-carbon enamel steel for household appliances |
| CN112119174A (en) * | 2018-05-17 | 2020-12-22 | 日本制铁株式会社 | Steel sheet and enamel product |
| WO2021233247A1 (en) * | 2020-05-18 | 2021-11-25 | 宝山钢铁股份有限公司 | Cold-rolled enamel steel for deep drawing inner container and manufacturing method therefor |
| CN113981300A (en) * | 2021-10-26 | 2022-01-28 | 攀钢集团攀枝花钢铁研究院有限公司 | Production method of cold-rolled enamel steel with yield strength of 330MPa |
| CN114395688A (en) * | 2021-12-09 | 2022-04-26 | 安阳钢铁集团有限责任公司 | Production process of low-carbon enamel steel |
| CN115595499A (en) * | 2022-08-29 | 2023-01-13 | 邯郸钢铁集团有限责任公司（Cn） | High-strength hot-rolling acid-washing enameled steel strip with excellent fish scaling resistance and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107868908A (en) * | 2017-11-03 | 2018-04-03 | 马鞍山钢铁股份有限公司 | A kind of deep-draw two-sided dust coat cold rolling glassed steel and production method |
| CN111074140B (en) * | 2017-12-27 | 2021-09-21 | 柳州钢铁股份有限公司 | Method for manufacturing cold-rolled low-carbon enamel steel for household appliances |
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| CN110777301A (en) * | 2018-07-30 | 2020-02-11 | 宝山钢铁股份有限公司 | Cold-rolled enamel steel and manufacturing method thereof |
| CN110777301B (en) * | 2018-07-30 | 2021-05-14 | 宝山钢铁股份有限公司 | Cold-rolled enamel steel and manufacturing method thereof |
| CN110273106A (en) * | 2019-07-30 | 2019-09-24 | 马鞍山钢铁股份有限公司 | A kind of 260MPa grades of cold-rolling continuous annealing glassed steel and its production method |
| WO2021233247A1 (en) * | 2020-05-18 | 2021-11-25 | 宝山钢铁股份有限公司 | Cold-rolled enamel steel for deep drawing inner container and manufacturing method therefor |
| CN113981300A (en) * | 2021-10-26 | 2022-01-28 | 攀钢集团攀枝花钢铁研究院有限公司 | Production method of cold-rolled enamel steel with yield strength of 330MPa |
| CN114395688A (en) * | 2021-12-09 | 2022-04-26 | 安阳钢铁集团有限责任公司 | Production process of low-carbon enamel steel |
| CN115595499A (en) * | 2022-08-29 | 2023-01-13 | 邯郸钢铁集团有限责任公司（Cn） | High-strength hot-rolling acid-washing enameled steel strip with excellent fish scaling resistance and preparation method thereof |
| CN115595499B (en) * | 2022-08-29 | 2023-10-31 | 邯郸钢铁集团有限责任公司 | High-strength hot-rolled pickled enamel steel strip with excellent anti-scaling performance and preparation method thereof |
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