CN105671257A - Heating method for cold-charging electrical steel - Google Patents
Heating method for cold-charging electrical steel Download PDFInfo
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- CN105671257A CN105671257A CN201610154286.8A CN201610154286A CN105671257A CN 105671257 A CN105671257 A CN 105671257A CN 201610154286 A CN201610154286 A CN 201610154286A CN 105671257 A CN105671257 A CN 105671257A
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- 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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/34—Methods of heating
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- 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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/005—Heat treatment of ferrous alloys containing Mn
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- 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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/008—Heat treatment of ferrous alloys containing Si
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- 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
- C21D9/0081—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for slabs; for billets
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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
- C22C38/004—Very low carbon steels, i.e. having a carbon content of less than 0,01%
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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
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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
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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
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
Abstract
The invention belongs to the technical field of metallurgy and particularly relates to a low-grade non-oriented electrical steel cold-charging furnace and a heating preparation method forelectrical steel. The heating method for the cold-charging electrical steel comprises the following steps of a, after making and casting steel into plate billets, and waiting to charge into the furnace by adopting a stacking mode; b, controlling heating temperatures and time at various stages; and c, controlling the tapping interval and the tapping temperature of the plate billets. According to the heating method disclosed by the invention, on the basis of the characteristics of an internal organizational structure of the cold-charging non-oriented electrical steel, a proper heating technique is formulated, the temperature at the earlier stage of temperature rise is reduced, the low-temperature heating time is prolonged, and the condition that the temperature difference between inside and outside of the cold-charging electrical steel is locatedwithin a controllable range is guaranteed; in addition, by adopting silicon contents as differentiating factors, different temperature rise speeds and time of various heating stages are formulated according to the difference of the silicon contents, the condition that the temperature raising speed is locatedwithin the controllable range is guaranteed, and the generation of stress is reduced; and meanwhile, high maneuverability is realized, and the rejection judgement of the non-oriented electrical steel caused by excessively-low temperature of casting blanks can be reduced.
Description
Technical field
The invention belongs to metallurgical technology field, be specifically related to a kind of low code non-oriented electrical steel cold charge and enter stove and heating preparation method thereof.
Background technology
Along with country strengthens electric power industry development, it is greatly promoted the development of electrical sheet rolling mill practice, but on prior art basis, owing to the increase of non-oriented electrical steel silicone content makes electrical sheet thermal conductivity and thermal coefficient of expansion reduce, as-cast grain size increases simultaneously, further, the increase of silicon content causes that the fragility of strand increases. Therefore continuous casting billet very easily produces implosion defect when reheating below 300 DEG C, and the implosion defect of generation can produce hole and the defect such as scab when finish rolling rolls, and causes finish rolling steel scrap or cold rolling broken belt, it is impossible to carry out cold rolling again rolling. The generation of internal fissure mainly has relation with internal stress. It is known that solid-state phase changes can be there are in the process of slow cooling and heating in strand, and cause contraction and expand, so that the volume of strand and form all change, if this change is obstructed, stress will be produced in strand, be referred to as internal stress, when the local stress within strand exceedes the strength degree of metal time, strand will crack, and generally the crackle that inside cannot be observed visually is referred to as internal fissure by us. Owing to non-oriented electrical steel silicon content is higher, cause that the fragility of strand is higher, therefore very easily produce internal fissure. So the raw material of steel casting is after hot rolling raw material storage, want scheme of arrangement immediately, must shove charge in 24 hours, it is prevented that temperature is too low when reheating, and internal stress change causes greatly the generation of internal fissure. But, due to various uncertain restrictions, such as hot rolling ad hoc inspection and repair, steel scrap processes and stalls for time, or device damage needs shutdown etc., it is possible to there will be can not shove charge within 24 hours. So the temperature electrical sheet raw material lower than 300 DEG C must be sentenced useless, melts down and heavily refines. It is badly in need of for this inventing a kind of heating means of cold charge heating electrical sheet under specific condition, it is possible to still shove charge can heat lower than less than 300 DEG C at electrical sheet, eliminate internal flaw by hot-rolling heating furnace heat treatment, and rolling is become a useful person smoothly.
Summary of the invention
The technical problem to be solved is to provide during a kind of energy meets low code non-oriented electrical steel shove charge heating and eliminates implosion defect and then can successfully roll the method become a useful person.
The heating means of a kind of cold charge electrical sheet described above, comprise the following steps:
A, steel-making supplied materials enter stokehold and process: after steel casting becomes slab, adopt the mode of stacking to place, wait into stove; The mode of described stacking refers to the hot base stacking temperature >=400 DEG C in slab surrounding;
B, each section of heating-up temperature and time control: slab is entered stove, carries out zone heating; Wherein, preheating section temperature≤1000 DEG C, 50min≤heat time heating time; Heat one section of temperature≤1120 DEG C, 50min≤heat time heating time; Heating two-stage nitration temperature≤1180 DEG C, 50min≤heat time heating time; Soaking zone temperature≤1170 DEG C, 50min≤heat time heating time;
C, control tapping interval and tapping temperature: tapping interval >=3.5min/ block, slab tapping temperature is 1140～1170 DEG C;
Wherein, described electrical sheet is made up of following weight percent composition, C≤0.005; Si0.15～1.55; Mn0.2～0.35; P≤0.020; S≤0.005; Als0.15～0.35; N≤40ppm; All the other are ferrum and inevitable impurity.
Further, as preferred technical scheme, the heating means of a kind of cold charge electrical sheet described above, a step is wherein put 2～3 pieces of hot bases in the bottom of slab, 2～3 pieces of hot bases are put at top, both sides heap heat release base.
Further, as preferred technical scheme, the heating means of a kind of cold charge electrical sheet described above, wherein in b step, each section of heating-up temperature and time control particularly as follows: Si0.15～0.25wt% in electrical sheet, 900 DEG C of < preheating section temperature≤1000 DEG C, 50min≤heat time heating time; 1000 DEG C of < heat one section of temperature≤1120 DEG C, 50min≤heat time heating time; 1120 DEG C of < heat two-stage nitration temperature≤1180 DEG C, 50min≤heat time heating time; 1130 DEG C of < soaking zone temperature≤1170 DEG C, 50min≤heat time heating time; Wherein, it is preferably 50～80min each period of heat time heating time.
Further, as preferred technical scheme, the heating means of a kind of cold charge electrical sheet described above, wherein in b step, each section of heating-up temperature and time control particularly as follows: Si0.26～1.10wt% in electrical sheet, 800 DEG C of < preheating section temperature≤900 DEG C, 55min≤heat time heating time; 900 DEG C of < heat one section of temperature≤1110 DEG C, 60min≤heat time heating time; 1110 DEG C of < heat two-stage nitration temperature≤1170 DEG C, 60min≤heat time heating time; 1130 DEG C of < soaking zone temperature≤1170 DEG C, 60min≤heat time heating time; Wherein, it is preferably 60～90min each period of heat time heating time.
Further, as preferred technical scheme, the heating means of a kind of cold charge electrical sheet described above, wherein in b step, each section of heating-up temperature and time control particularly as follows: Si1.11～1.55wt% in electrical sheet, 500 DEG C of < preheating section temperature≤800 DEG C, 60min≤heat time heating time; 800 DEG C of < heat one section of temperature≤1100 DEG C, 70min≤heat time heating time; 1100 DEG C of < heat two-stage nitration temperature≤1160 DEG C, 60min≤heat time heating time; 1130 DEG C of < soaking zone temperature≤1170 DEG C, 60min≤heat time heating time; Wherein, it is preferably 60～90min the heat time heating time of preheating section, heating two-stage nitration and soaking zone; Heating a period of time is preferably 70～100min.
Further, as preferred technical scheme, the heating means of a kind of cold charge electrical sheet described above, Si0.20 in wherein said electrical sheet, preheating section temperature 980 DEG C, heat time heating time 55min;Heat one section of temperature 1100 DEG C, heat time heating time 60min; Heating two-stage nitration temperature 1165 DEG C, heat time heating time 53min; Soaking zone temperature 1160 DEG C, heat time heating time 60min.
Further, as preferred technical scheme, the heating means of a kind of cold charge electrical sheet described above, Si0.98 in wherein said electrical sheet, preheating section temperature 880 DEG C, heat time heating time 55min; Heat one section of temperature 1100 DEG C, heat time heating time 65min; Heating two-stage nitration temperature 1160 DEG C, heat time heating time 63min; Soaking zone temperature 1165 DEG C, heat time heating time 65min.
Further, as preferred technical scheme, the heating means of a kind of cold charge electrical sheet described above, Si1.15 in wherein said electrical sheet, preheating section temperature 750 DEG C, heat time heating time 55min; Heat one section of temperature 1050 DEG C, heat time heating time 75min; Heating two-stage nitration temperature 1150 DEG C, heat time heating time 63min; Soaking zone temperature 1165 DEG C, heat time heating time 65min.
There is advantages that
1, the present invention is based on cold charge non-oriented electrical steel internal organizational structure feature, formulates the heating technology establishment being suitable for, and reduces intensification early stage heating-up temperature and extends the low-temperature heat time, it is ensured that the internal-external temperature difference of cold charge electrical sheet is in controlled range.
2 present invention adopt with silicone content for differentiating factor, formulate different programming rates and each bringing-up section time according to silicon content difference, it is ensured that programming rate, in controlled range, reduces the generation of thermal stress.
3 present invention have workable, it is possible to reduce cause non-oriented electrical steel to be sentenced because strand temperature is too low useless, improve the production qualification rate of electrical sheet.
Detailed description of the invention
The heating means of cold charge electrical sheet of the present invention, specifically include following steps:
A, steel-making supplied materials enter stokehold and process: after steel casting becomes slab, adopt the mode of stacking to place, wait into stove; The mode of described stacking refers to the hot base stacking temperature >=400 DEG C in slab surrounding; The present invention stacks the hot base of more than 400 DEG C in steelmaking feed surrounding, is that surface cooling is fast, and center cooling slowly, thus producing residual stress, further results in the generation of internal fissure in order to prevent slab from failing before smooth shove charge rolling;
B, each section of heating-up temperature and time control: slab is entered stove, carries out zone heating; Wherein, preheating section temperature≤1000 DEG C, 50min≤heat time heating time; Heat one section of temperature≤1120 DEG C, 50min≤heat time heating time; Heating two-stage nitration temperature≤1180 DEG C, 50min≤heat time heating time; Soaking zone temperature≤1170 DEG C, 50min≤heat time heating time; In the present invention, electrical sheet adopts the mode of zone heating and heating rate when needing strict control to heat in heating steps, it is prevented that the rate of heat addition is too fast, and electrical sheet produces thermal stress, produces internal fissure;
C, control tapping interval and tapping temperature: tapping interval >=3.5min/ block, slab tapping temperature is 1140～1170 DEG C; Existence due to the thermal resistance of electrical sheet own, hankering inevitably causing that electrical sheet surfaces externally and internally exists the temperature difference adding, surface temperature is higher than central temperature, and the existence of the temperature difference can cause that rolling stability is poor, cause steel scrap, be the one of the main reasons affecting electrical sheet qualification rate. For ensureing that electrical sheet is complete in soaking zone soaking, section has a narrow range of temperature, and need to strictly control tapping interval, it is ensured that all thermal effects; It addition, when heating-up temperature is too high, electrical sheet can produce " waist phenomenon of collapsing " in heating furnace and damage inside heating furnace structure, and produces mixed grain structure during for avoiding electrical sheet to roll, and need to shorten electrical sheet at two-phase section rolling time; Strict control slab tapping temperature is needed for this;
Wherein, described electrical sheet is made up of following weight percent composition, C≤0.005;Si0.15～1.55; Mn0.2～0.35; P≤0.020; S≤0.005; Als0.15～0.35; N≤40ppm; All the other are ferrum and inevitable impurity.
Further, as preferred technical scheme, the heating means of a kind of cold charge electrical sheet described above, a step is wherein put 2～3 pieces of hot bases in the bottom of slab, 2～3 pieces of hot bases are put at top, both sides heap heat release base. Hot-cast base is in condensation process, and owing to surface cooling is fast, center cooling is slow, also to produce stress, be called residual stress, and this is one of key element causing internal fissure.
It addition, silicon is the most basic element of non-oriented electrical steel, the existence of silicon can improve resistivity, significantly reduces eddy-current loss, thus reducing iron loss. from mechanical property aspect, silicon has very strong ferrite strengthening ability, and along with the increase of silicone content, yield strength and tensile strength significantly improve, but elongation percentage significantly reduces, and fragility increases. non-oriented electrical steel slab cooling to less than 300 DEG C, during reheating, thermal resistance due to itself, inevitably there is inside and outside temperature difference, surface temperature is faster than what central temperature raised, at this moment the expansion on surface is greater than the expansion at center, such surface be stressed and center by tension force, then temperature stress is produced in the inside of steel, it is called thermal stress, the size of thermal stress depends on the size of thermograde, firing rate is more fast, the inside and outside temperature difference is more big, thermograde is more big, thermal stress is more big, when the rupture strength of strand is certain, if this thermal stress has exceeded the rupture strength limit of strand, then the inside of strand will produce internal fissure, so the firing rate for cold charge non-oriented electrical steel must be limited within the scope allowed.
And, stress in strand is simply only danger within limits, learn through experimental observation, non-oriented electrical steel is once in elastic stage at 300 DEG C, plasticity ratio is relatively low, if at this time firing rate is too fast, temperature stress exceedes the strength degree of strand and arises that crackle, therefore electrical sheet heating means of the present invention are for Different Silicon content, adopt different heating-up temperatures and the rate of heat addition, it is to avoid electrical sheet is too fast because heating, cause that electrical sheet produces inside and outside temperature difference in heating process, thus producing thermal stress, produce internal fissure.
Further, as preferred technical scheme, the heating means of a kind of cold charge electrical sheet described above, wherein in b step, each section of heating-up temperature and time control particularly as follows: Si0.15～0.25wt% in electrical sheet, 900 DEG C of < preheating section temperature≤1000 DEG C, 50min≤heat time heating time; 1000 DEG C of < heat one section of temperature≤1120 DEG C, 50min≤heat time heating time; 1120 DEG C of < heat two-stage nitration temperature≤1180 DEG C, 50min≤heat time heating time; 1130 DEG C of < soaking zone temperature≤1170 DEG C, 50min≤heat time heating time; Wherein, for each period of heat time heating time, in actual production, if it occur that burst accident, each section of time inside furnace does not do ceiling restriction, but in order to control cost, it is ensured that burning steel quality, each period of heat time heating time is preferably 50～80min.
Further, as preferred technical scheme, the heating means of a kind of cold charge electrical sheet described above, wherein in b step, each section of heating-up temperature and time control particularly as follows: Si0.26～1.10wt% in electrical sheet, 800 DEG C of < preheating section temperature≤900 DEG C, 55min≤heat time heating time; 900 DEG C of < heat one section of temperature≤1110 DEG C, 60min≤heat time heating time;1110 DEG C of < heat two-stage nitration temperature≤1170 DEG C, 60min≤heat time heating time; 1130 DEG C of < soaking zone temperature≤1170 DEG C, 60min≤heat time heating time; Wherein, in order to control cost, it is ensured that burning steel quality, each period of heat time heating time is preferably 60～90min.
Further, as preferred technical scheme, the heating means of a kind of cold charge electrical sheet described above, wherein in b step, each section of heating-up temperature and time control particularly as follows: Si1.11～1.55wt% in electrical sheet, 500 DEG C of < preheating section temperature≤800 DEG C, 60min≤heat time heating time; 800 DEG C of < heat one section of temperature≤1100 DEG C, 70min≤heat time heating time; 1100 DEG C of < heat two-stage nitration temperature≤1160 DEG C, 60min≤heat time heating time; 1130 DEG C of < soaking zone temperature≤1170 DEG C, 60min≤heat time heating time; Wherein, in order to control cost, it is ensured that burning steel quality, the heat time heating time of preheating section, heating two-stage nitration and soaking zone is preferably 60～90min; Heating a period of time is preferably 70～100min.
Further, as preferred technical scheme, the heating means of a kind of cold charge electrical sheet described above, Si0.20 in wherein said electrical sheet, preheating section temperature 980 DEG C, heat time heating time 55min; Heat one section of temperature 1100 DEG C, heat time heating time 60min; Heating two-stage nitration temperature 1165 DEG C, heat time heating time 53min; Soaking zone temperature 1160 DEG C, heat time heating time 60min.
Further, as preferred technical scheme, the heating means of a kind of cold charge electrical sheet described above, Si0.98 in wherein said electrical sheet, preheating section temperature 880 DEG C, heat time heating time 55min; Heat one section of temperature 1100 DEG C, heat time heating time 65min; Heating two-stage nitration temperature 1160 DEG C, heat time heating time 63min; Soaking zone temperature 1165 DEG C, heat time heating time 65min.
Further, as preferred technical scheme, the heating means of a kind of cold charge electrical sheet described above, Si1.15 in wherein said electrical sheet, preheating section temperature 750 DEG C, heat time heating time 55min; Heat one section of temperature 1050 DEG C, heat time heating time 75min; Heating two-stage nitration temperature 1150 DEG C, heat time heating time 63min; Soaking zone temperature 1165 DEG C, heat time heating time 65min.
The development of electrical sheet kind should meet the different demands of the national economic development. China is the big country of a power industry chronic shortage, and along with the raising of the development produced and living standards of the people, electric power breach can more show prominent. therefore country will using strengthening electric power industry development as long-term building policy, this electrical sheet yield just requiring to increase non-oriented high grade and low iron loss energetically, owing to the increase of silicone content makes electrical sheet thermal conductivity and thermal coefficient of expansion reduce, as-cast grain size increases simultaneously, continuous casting billet can produce implosion defect below 300 DEG C, hole and scab defects can be produced when finish rolling rolls, cause hot rolling steel scrap or cold rolling broken belt, therefore the raw material of steel casting is after hot rolling raw material storage, want stacking slow cooling immediately, namely 2～3 pieces of hot bases are put in bottom, 2～3 pieces of hot bases are put at top, both sides heap heat release base (temperature is more high more good), must shove charge in 24 hours.
Electrical sheet heating means of the present invention, after being both avoided that tradition electrician's molten steel was cast into slab, because some reason can not roll in shove charge in time so that electrical sheet cools down too fast in wait, thus producing residual stress, causes the generation of internal fissure; Also be avoided that because cooled for a long time, board briquette lower than 300 DEG C after, scrap melt down heavily experienced, namely electrical sheet heating means of the present invention not only can for board briquette after casting more than 300 DEG C, can also heat for the board briquette electrical sheet lower than 300 DEG C, electrical sheet can be improved and produce qualification rate, reduce electrical sheet rolling cost;According to Different Silicon content during electrical sheet of the present invention heating simultaneously, during zone heating, adopt different heating-up temperatures and heat time heating time, so that each section of heating rate difference, it is to avoid heating rate is too fast, produces thermal stress.
Below in conjunction with embodiment, the specific embodiment of the present invention is further described, does not therefore limit the present invention among described scope of embodiments.
Embodiment 1
Having carried out engineering test at Xichang steel vanadium hot rolling mill according to the composition design and processes design of invention, producing the trade mark is the non-oriented electrical steel of 50PRW1300, and composition is as shown in table 1:
The chemical composition (wt%) of table 150PRW1300 non-oriented electrical steel
| Produce the trade mark | C | Si | Mn | Als |
| 50PRW1300 | 0.0030 | 0.20 | 0.22 | 0.18 |
1, steel-making supplied materials carries out stacking slow cooling, method particularly includes: 2～3 pieces of hot bases are put in bottom, and 2～3 pieces of hot bases are put at top, both sides heap heat release base (temperature is more high more good).
2, the heating technique carried out according to silicone content is as shown in table 2:
The heating technique of table 250PRW1300 non-oriented electrical steel
3, for ensureing that each section of time inside furnace guarantee are slowly heated, tapping interval is controlled according to >=3.5min/ block.
4, slab comes out of the stove target temperature according to 1155 ± 15 DEG C of controls, and controls the temperature difference between stove.
The product produced is checked, up-to-standard, its qualification rate reaches 97.5%, meets technological requirement.
Embodiment 2
Having carried out engineering test at Xichang steel vanadium hot rolling mill according to the composition design and processes design of invention, producing the trade mark is the non-oriented electrical steel of 50PRW800, and composition is as shown in table 3:
The chemical composition (wt%) of table 350PRW800 non-oriented electrical steel
| Produce the trade mark | C | Si | Mn | Als |
| 50PRW800 | 0.0035 | 0.98 | 0.27 | 0.28 |
1, steel-making supplied materials carries out stacking slow cooling, method particularly includes: 2～3 pieces of hot bases are put in bottom, and 2～3 pieces of hot bases are put at top, both sides heap heat release base (temperature is more high more good).
2, the heating technique carried out according to silicone content is as shown in table 4:
The heating technique of table 450PRW800 non-oriented electrical steel
3, for ensureing that each section of time inside furnace guarantee are slowly heated, tapping interval is controlled according to >=3.5min/ block;
4, slab comes out of the stove target temperature according to 1155 ± 15 DEG C of controls, and controls the temperature difference between stove.
The product produced is checked, up-to-standard, its qualification rate reaches 95%, meets technological requirement.
Embodiment 3
Having carried out engineering test at Xichang steel vanadium hot rolling mill according to the composition design and processes design of invention, producing the trade mark is the non-oriented electrical steel of 50PRW600, and composition is as shown in table 3:
The chemical composition (wt%) of table 550PRW600 non-oriented electrical steel
| Produce the trade mark | C | Si | Mn | Als |
| 50PRW600 | 0.0020 | 1.51 | 0.27 | 0.23 |
1, steel-making supplied materials carries out stacking slow cooling, method particularly includes: 2～3 pieces of hot bases are put in bottom, and 2～3 pieces of hot bases are put at top, both sides heap heat release base (temperature is more high more good);
2, the heating technique carried out according to silicone content is as shown in table 6:
The heating technique of table 650PRW600 non-oriented electrical steel
3, for ensureing that each section of time inside furnace guarantee are slowly heated, tapping interval is controlled according to >=3.5min/ block;
4, slab comes out of the stove target temperature according to 1155 ± 15 DEG C of controls, and controls the temperature difference between stove.
The product produced is checked, up-to-standard, its qualification rate reaches 94%, meets technological requirement.
Comparative example 1
Adopting tradition electrical sheet heating means, producing the trade mark is the non-oriented electrical steel of 50PRW600, and composition is as shown in table 7;
The heating technique of table 750PRW600 non-oriented electrical steel
| Produce the trade mark | C | Si | Mn | Als |
| 50PRW600 | 0.0020 | 1.51 | 0.27 | 0.23 |
Slab after steel casting is because of some reason, it is impossible to the rolling of converter in time, directly stacks, waits into stove, owing to the waiting time is longer, cause that board briquette is down to less than 300 DEG C in hot rolling raw material storage, and through inspection, electrical sheet raw material base is sentenced useless, melts down heavily experienced.
Comparative example 2
Adopting tradition electrical sheet heating means, producing the trade mark is the non-oriented electrical steel of 50PRW1300, and composition is as shown in table 1;
Slab after steel casting enters stove rolling, and its heating technique is as shown in table 8:
The heating technique of table 850PRW1300 non-oriented electrical steel
The product produced being checked, it has been found that there is hole in the middle part of strip steel, qualification rate is 85%.
Comparative example 3
Adopting tradition electrical sheet heating means, producing the trade mark is the non-oriented electrical steel of 50PRW800, and composition is as shown in table 9;
Slab after steel casting enters stove rolling, and its heating technique is as shown in table 8:
The heating technique of table 950PRW800 non-oriented electrical steel
The product produced being checked, it has been found that there is hole and crackle in the middle part of strip steel, qualification rate is 81.5%.
Claims (8)
1. the heating means of a cold charge electrical sheet, it is characterised in that: comprise the following steps:
A, steel-making supplied materials enter stokehold and process: after steel casting becomes slab, adopt the mode of stacking to place, wait into stove; The mode of described stacking refers to the hot base stacking temperature >=400 DEG C in slab surrounding;
B, each section of heating-up temperature and time control: slab is entered stove, carries out zone heating; Wherein, preheating section temperature≤1000 DEG C, 50min≤heat time heating time; Heat one section of temperature≤1120 DEG C, 50min≤heat time heating time; Heating two-stage nitration temperature≤1180 DEG C, 50min≤heat time heating time; Soaking zone temperature≤1170 DEG C, 50min≤heat time heating time;
C, control tapping interval and tapping temperature: tapping interval >=3.5min/ block, slab tapping temperature is 1140～1170 DEG C;
Wherein, described electrical sheet is made up of following weight percent composition, C≤0.005; Si0.15～1.55; Mn0.2～0.35; P≤0.020; S≤0.005; Als0.15～0.35; N≤40ppm; All the other are ferrum and inevitable impurity.
2. the heating means of a kind of cold charge electrical sheet according to claim 1, it is characterised in that: put 2～3 pieces of hot bases in a step in the bottom of slab, 2～3 pieces of hot bases are put at top, both sides heap heat release base.
3. the heating means of a kind of cold charge electrical sheet according to claim 1, it is characterized in that: in b step, each section of heating-up temperature and time control particularly as follows: Si0.15～0.25wt% in electrical sheet, 900 DEG C of < preheating section temperature≤1000 DEG C, 50min≤heat time heating time; 1000 DEG C of < heat one section of temperature≤1120 DEG C, 50min≤heat time heating time; 1120 DEG C of < heat two-stage nitration temperature≤1180 DEG C, 50min≤heat time heating time; 1130 DEG C of < soaking zone temperature≤1170 DEG C, 50min≤heat time heating time; Wherein, it is preferably 50～80min each period of heat time heating time.
4. the heating means of a kind of cold charge electrical sheet according to claim 1, it is characterized in that: in b step, each section of heating-up temperature and time control particularly as follows: Si0.26～1.10wt% in electrical sheet, 800 DEG C of < preheating section temperature≤900 DEG C, 55min≤heat time heating time; 900 DEG C of < heat one section of temperature≤1110 DEG C, 60min≤heat time heating time; 1110 DEG C of < heat two-stage nitration temperature≤1170 DEG C, 60min≤heat time heating time; 1130 DEG C of < soaking zone temperature≤1170 DEG C, 60min≤heat time heating time; Wherein, it is preferably 60～90min each period of heat time heating time.
5. the heating means of a kind of cold charge electrical sheet according to claim 1, it is characterized in that: in b step, each section of heating-up temperature and time control particularly as follows: Si1.11～1.55wt% in electrical sheet, 500 DEG C of < preheating section temperature≤800 DEG C, 60min≤heat time heating time;800 DEG C of < heat one section of temperature≤1100 DEG C, 70min≤heat time heating time; 1100 DEG C of < heat two-stage nitration temperature≤1160 DEG C, 60min≤heat time heating time; 1130 DEG C of < soaking zone temperature≤1170 DEG C, 60min≤heat time heating time; Wherein, it is preferably 60～90min the heat time heating time of preheating section, heating two-stage nitration and soaking zone; Heating a period of time is preferably 70～100min.
6. the heating means of a kind of cold charge electrical sheet according to claim 3, it is characterised in that: Si0.20 in described electrical sheet, preheating section temperature 980 DEG C, heat time heating time 55min; Heat one section of temperature 1100 DEG C, heat time heating time 60min; Heating two-stage nitration temperature 1165 DEG C, heat time heating time 53min; Soaking zone temperature 1160 DEG C, heat time heating time 60min.
7. the heating means of a kind of cold charge electrical sheet according to claim 4, it is characterised in that: Si0.98 in described electrical sheet, preheating section temperature 880 DEG C, heat time heating time 55min; Heat one section of temperature 1100 DEG C, heat time heating time 65min; Heating two-stage nitration temperature 1160 DEG C, heat time heating time 63min; Soaking zone temperature 1165 DEG C, heat time heating time 65min.
8. the heating means of a kind of cold charge electrical sheet according to claim 5, it is characterised in that: Si1.15 in described electrical sheet, preheating section temperature 750 DEG C, heat time heating time 55min; Heat one section of temperature 1050 DEG C, heat time heating time 75min; Heating two-stage nitration temperature 1150 DEG C, heat time heating time 63min; Soaking zone temperature 1165 DEG C, heat time heating time 65min.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109182707A (en) * | 2018-11-28 | 2019-01-11 | 攀钢集团攀枝花钢铁研究院有限公司 | The production method of non-oriented electrical steel hot rolled plate |
| CN109174962A (en) * | 2018-09-05 | 2019-01-11 | 攀钢集团江油长城特殊钢有限公司 | A kind of corrosion resistant type plastic mould rolling band steel homogenize process method |
| CN109517960A (en) * | 2018-11-28 | 2019-03-26 | 攀钢集团攀枝花钢铁研究院有限公司 | The production method of non-orientation silicon steel |
| CN110055391A (en) * | 2019-04-24 | 2019-07-26 | 首钢集团有限公司 | A method of eliminating fine steel hot rolling edge crack defect |
| CN111673059A (en) * | 2020-07-28 | 2020-09-18 | 攀钢集团西昌钢钒有限公司 | Converter pretreatment and cold charging heating method for high-carbon high-alloy continuous casting billet |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1993008313A1 (en) * | 1991-10-22 | 1993-04-29 | Pohang Iron & Steel Co., Ltd. | Nonoriented electrical steel sheets with superior magnetic properties, and methods for manufacturing thereof |
| CN101942557A (en) * | 2010-09-20 | 2011-01-12 | 秦皇岛首秦金属材料有限公司 | Method for controlling hot-conveying charging temperature of casting blanks accurately |
| CN103212588A (en) * | 2013-05-02 | 2013-07-24 | 武汉钢铁(集团)公司 | Method of reducing defect that slag is clamped under surface when carbon manganese steel is rolled in a hot mode |
| CN103882219A (en) * | 2012-12-21 | 2014-06-25 | 鞍钢股份有限公司 | Slab heating method in silicon steel hot-rolling process |
-
2016
- 2016-03-17 CN CN201610154286.8A patent/CN105671257B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1993008313A1 (en) * | 1991-10-22 | 1993-04-29 | Pohang Iron & Steel Co., Ltd. | Nonoriented electrical steel sheets with superior magnetic properties, and methods for manufacturing thereof |
| CN101942557A (en) * | 2010-09-20 | 2011-01-12 | 秦皇岛首秦金属材料有限公司 | Method for controlling hot-conveying charging temperature of casting blanks accurately |
| CN103882219A (en) * | 2012-12-21 | 2014-06-25 | 鞍钢股份有限公司 | Slab heating method in silicon steel hot-rolling process |
| CN103212588A (en) * | 2013-05-02 | 2013-07-24 | 武汉钢铁(集团)公司 | Method of reducing defect that slag is clamped under surface when carbon manganese steel is rolled in a hot mode |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109174962A (en) * | 2018-09-05 | 2019-01-11 | 攀钢集团江油长城特殊钢有限公司 | A kind of corrosion resistant type plastic mould rolling band steel homogenize process method |
| CN109182707A (en) * | 2018-11-28 | 2019-01-11 | 攀钢集团攀枝花钢铁研究院有限公司 | The production method of non-oriented electrical steel hot rolled plate |
| CN109517960A (en) * | 2018-11-28 | 2019-03-26 | 攀钢集团攀枝花钢铁研究院有限公司 | The production method of non-orientation silicon steel |
| CN110055391A (en) * | 2019-04-24 | 2019-07-26 | 首钢集团有限公司 | A method of eliminating fine steel hot rolling edge crack defect |
| CN111673059A (en) * | 2020-07-28 | 2020-09-18 | 攀钢集团西昌钢钒有限公司 | Converter pretreatment and cold charging heating method for high-carbon high-alloy continuous casting billet |
| CN111673059B (en) * | 2020-07-28 | 2022-05-03 | 攀钢集团西昌钢钒有限公司 | Converter pretreatment and cold charging heating method for high-carbon high-alloy continuous casting billet |
| CN112296102A (en) * | 2020-09-30 | 2021-02-02 | 首钢集团有限公司 | Control method and control device for low-temperature heating of non-oriented silicon steel plate blank |
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