CN102560028B - Method and material frame for annealing cold-rolled plates of low-magnetic alloy structural steel - Google Patents
Method and material frame for annealing cold-rolled plates of low-magnetic alloy structural steel Download PDFInfo
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- CN102560028B CN102560028B CN201210058373.5A CN201210058373A CN102560028B CN 102560028 B CN102560028 B CN 102560028B CN 201210058373 A CN201210058373 A CN 201210058373A CN 102560028 B CN102560028 B CN 102560028B
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Abstract
The invention provides a method and a material frame for annealing cold-rolled plates of low-magnetic alloy structural steel. The method comprises the following steps of: 1, arranging a cold-rolled plate stack of the low-magnetic alloy structural steel on a material frame bottom plate of the annealing material frame vertically to obtain a vertical cold-rolled plate stack; 2, arranging steel bar cushion blocks among the cold-rolled plates of the vertical cold-rolled plate stack, so that the cold-rolled plates are partitioned with each other at intervals; 3, clamping upper and lower ends of the vertical cold-rolled plate stack by using a clamping device; and 4, annealing the cold-rolled plate stack processed in the step 3 by using a bell-type furnace. By the method, surface hardened layers are not formed on upper and lower surfaces of the steel plate, so that the quality problem of the cold-bending cracks of the annealed steel plate is solved.
Description
Technical field
The present invention relates to method for annealing and annealing material rest that a kind of low magnetic closes knot steel cold-reduced sheet, especially relate to the vertical dress method for annealing that a kind of low magnetic closes knot steel cold-reduced sheet, through this anneal, steel plate upper and lower surface does not generate the table hard formation of the about 0.05-0.1mm of thickness, can meet the requirement of the naval vessels low magnetic steel deck of boat.
background technology
Closing knot steel refers to as mechanical component and various engineering component the steel that contains one or several a certain amount of alloying elements.Low magnetic steel (low-magnetic steel) is to the inductionless steel of ferromegnetism, conventionally permeability is called to low magnetic steel lower than 1.5 steel.
On naval vessel, need its material therefor to disturb by Antimagnetic, for example, prevent submarine mine and magnetic search, otherwise easily by enemy's magnetic survey instrument, detected, or be subject to the strike of the weapons such as enemy's magnetic mine.Therefore, magnetic is very disadvantageous concerning warship, low magnetic and nonmagnetic steel to naval vessel " stealthy " can play extraordinary effect.It is high manganese low magnetic steel that low magnetic closes knot steel, and this class steel is greater than 17% containing manganese, and carbon content is general all below 1.0%, has that tissue is stable, a good mechanical performance, feature that relative magnetic permeability is low, and therefore, low magnetic closes to be tied steel cold-reduced sheet and can be used as the naval vessels low magnetic steel deck of boat.
In prior art, the technical process that low magnetic closes knot steel cold-reduced sheet is: middle slab is sheared, and------individual is cold rolling, and------------shear scale---packs, weighs---and hand over storehouse aligning service check in annealing (for example electricity cover stove) in pickling.Through above-mentioned technical process, produce, products obtained therefrom thickness specification is 3～5mm.In process of production, cold-rolled steel sheet is after annealing, and when the clod wash of inspection process performance, product carries out cold bending experiment and there will be crackle, makes not meet the requirement as the naval vessels low magnetic steel deck of boat.
summary of the invention
Technical problem to be solved by this invention is to overcome low magnetic to close knot steel cold-reduced sheet and carry out the defect that cold bending experiment there will be crackle, provide a kind of low magnetic to close method for annealing and the annealing material rest of knot steel cold-reduced sheet, adopt the mode of the vertical dress of steel plate to anneal, steel plate upper and lower surface can not generate table hard formation, and the Cold Bending Crack mass defect of annealed sheet steel is resolved.
The inventor by production follow the tracks of and repeatedly short run analysis of experiments draw, cold-rolled steel sheet is after annealing, steel plate upper and lower surface can generate the approximately table hard formation of 0.05～0.1mm of thickness, and this table hard formation can make low magnetic close when knot steel cold-reduced sheet carries out cold bending test, to occur crackle meeting.
The inventor further analyzes and obtains showing reason that hard formation generates mainly: low magnetic closes knot steel cold-rolled steel sheet in the operation of rolling; the technique used is cooling, lubricated can be residued in surface of steel plate and form emulsion film with emulsion; in the annealing process of nitrogen protection atmosphere; the emulsion remained film of whole buttress surface of steel plate can be dried; because of its AL content higher; the flue gas producing is followed the complicated chemical reactions such as surface of steel plate can be oxidized, nitriding, decarburization, makes steel plate interlayer upper and lower surface generate the approximately table hard formation of 0.05～0.1mm.The inventor follows the tracks of existing annealing process and finds, when annealing is warmed up to 350 ℃, stops annealing, hangs out steel plate buttress, and the flue gas of steel plate interlayer can constantly be gushed out.
The present invention adopts the vertical dress of cold-reduced sheet (steel plate) and will between cold-reduced sheet and cold-reduced sheet, by the method for reinforcing bar isolation, anneal, although the emulsion remained film of surface of steel plate can be dried and be produced flue gas in annealing temperature-rise period, but this flue gas can be quickly discharged (vent valve that for example covers stove (electricity cover annealing furnace) outer cover by electricity), the flue gas and the chemical reaction of surface of steel plate that thoroughly stop above-mentioned emulsion film to produce, prevent low magnetic to close to tie steel cold-reduced sheet mass defect at the upper and lower surface generation table hard formation of steel plate in annealing process.
In order to solve the problems of the technologies described above, the invention provides a kind of annealing material rest that closes the annealing of knot steel cold-reduced sheet for low magnetic, this bin comprises: bin base plate 1; The spaced row of at least two on bin base plate 1 support post 2 that is positioned at of tool; Oblique 3, its one end is connected on the side of support post 2 bottoms, and the other end is connected on the opposite flank of adjacent supports column 2, and this oblique forms angle of inclination with bin base plate 1; And bin suspension hook.
Annealing material rest adopts the material with high temperature deformation resistance ability, preferably adopts the 304 moderate stainless steel materials of cost that 40mm is thick to be welded.Annealing material rest physical dimension length, according to annealing device size and product size design, is convenient to put, operate.For above-mentioned reasons, the row of the support post of annealing material rest does not have special stipulation, as long as can meet product size and annealing device dimensional requirement.Stand between individual cold-reduced sheet that is loaded on annealing material rest and put out with steel bar spacer, increased labour intensity, and operational difficulty.The present invention is provided with (being preferably welded) oblique on bin base plate, and its surface working is smooth, and cold-reduced sheet stands up on oblique like this, and in the time of can being convenient to insert steel bar spacer, sled moves cold-reduced sheet.
Aforesaid annealing material rest, described oblique 3 is oblique 3 that is welded on adjacent two support posts 2, described angle of inclination is 25-45 degree.
Aforesaid annealing material rest, described bin base plate 1, support post 2 and oblique 3 are 35-45mm, preferably the thick stainless steel plate of 40mm.
The invention provides the method for annealing that a kind of low magnetic closes knot steel cold-reduced sheet, apply above-mentioned annealing material rest, the method comprises the steps: first step, low magnetic is closed to the cold rolling straight sheet pile of knot steel is vertical to be loaded on the bin base plate of annealing material rest, obtains the cold rolling straight sheet pile of vertical dress; Second step, places steel bar spacer between every cold-reduced sheet of the cold rolling straight sheet pile after described vertical dress and cold-reduced sheet, with by individual cold-reduced sheet interval each other; Third step, steps up the upper and lower two ends of cold rolling straight sheet pile of vertical dress respectively with gripping unit; The 4th step, the cold rolling straight sheet pile after step 3 is processed adopts bell furnace to carry out anneal.
The low magnetic of the present invention closes knot steel cold-reduced sheet, be containing manganese be greater than 17%, carbon content is at the cold-reduced sheet below 1.0%, preferred low magnetic steel 45Mn17Al
3.
Aforesaid low magnetic closes the method for annealing of knot steel cold-reduced sheet, in the 4th step, adopts 20-50 ℃/h of temperature rise rate to heat up, and is warmed up to 750-790 ℃ and keeps constant temperature 4-6h.
Aforesaid low magnetic closes the method for annealing of knot steel cold-reduced sheet, and in the 4th step, described temperature rise rate is 40 ℃/h, is warmed up to 780 ℃ and keeps constant temperature 5 hours.
Aforesaid low magnetic closes the method for annealing of knot steel cold-reduced sheet, and described bell furnace is electricity cover annealing furnace.
Aforesaid low magnetic closes the method for annealing of knot steel cold-reduced sheet, and in the 4th step, constant temperature is transported to outer cover by cold-reduced sheet after processing, and is then cooled to≤comes out of the stove after 280 ℃.
Aforesaid low magnetic closes the method for annealing of knot steel cold-reduced sheet, in first step, low magnetic is closed to knot steel cold-reduced sheet and divide buttress, obtains cold rolling straight sheet pile, then cold rolling straight sheet pile is stood and is loaded on the bin base plate of annealing material rest, between every two support posts, places a cold rolling straight sheet pile.
Preferably, conventionally adopt conventional hanging device in the mode of lifting, cold-reduced sheet to be stood and is loaded in annealing material rest, for example, adopt overhead traveling crane (bridge crane).But the cold-reduced sheet keeping flat is become to vertical lifting with steel cable exists side by side and is loaded on bin, its operational difficulty and have potential safety hazard, therefore the present invention preferably adopts a minute buttress lifting, in order to reduce lifting weight, and easy to operate, for product specification, being for example 3.0/4.0*1500*2500mm, is that a buttress divides buttress according to approximately 3～5 tons; In addition, the number of the cold-reduced sheet that described in this patent, cold rolling straight sheet pile has is unrestricted, can be one.Annealing material rest can first hang in separately in annealing furnace, and after also can founding dress cold-reduced sheet and laying steel bar spacer, integral body is fallen in annealing furnace.
Aforesaid low magnetic closes the method for annealing of knot steel cold-reduced sheet, and in second step, the diameter of described steel bar spacer is ￠ 10-14mm, preferably ￠ 12mm.
The aforesaid method for annealing that closes knot steel cold-reduced sheet, in third step, described gripping unit comprises the first steel plate bar and the second steel plate bar, wherein the two ends of the first steel plate bar and the second steel plate bar are provided with movable fastening piece (preferably screw and matching nut); When the upper and lower two ends of cold rolling straight sheet pile of vertical dress are stepped up respectively with described gripping unit, respectively cold rolling straight sheet pile two ends are put between the first steel plate bar and the second steel plate bar of two gripping units, adjusting bolt is stepped up operation.
Vertical dress under the long-time high temperature annealing state of cold rolling straight sheet pile produces slump distortion, will stand up steel plate two ends clamp up and down with above-mentioned clamping device, can prevent from producing under the long-time high temperature annealing state of cold rolling straight sheet pile the problem of slump distortion.
Adopt technical scheme of the present invention, at least there is following beneficial effect:
1, cold-reduced sheet (steel plate) is kept flat to annealing and change into and stand up annealing, thoroughly solved while closing the annealing of knot steel cold-reduced sheet the defect at steel plate upper and lower surface formation table hard formation.
2, the present invention has shortened the annealing cycle (from 7 days, becoming 3.5 days), although therefore in annealing process of the present invention batch reduce, production capacity does not reduce (keep flat 50～60 tons of annealing batches, stand up 25～30 tons of annealing batches).
3, cold-reduced sheet (steel plate) vertical dress annealing process and the comparison of normalizing furnace single steel plate annealing process, be not subject to normalizing furnace ability restriction, and rhythm of production can be controlled voluntarily.
4, after cold-reduced sheet (steel plate) vertical dress annealing process and the residual breast of gasoline wiping steel plate, become buttress to keep flat annealing process comparison, have production cost low, efficiency is high, safe and reliable advantage.
Accompanying drawing explanation
Fig. 1 is prior art 45Mn17Al
3low magnetic closes the metallurgical analysis of knot steel cold-reduced sheet annealing surface hard formation;
Fig. 2 is 45Mn17Al
3the composition profiles that low magnetic closes knot steel cold-reduced sheet front detects;
Fig. 3 is 45Mn17Al
3the composition profiles that low magnetic closes knot steel cold-reduced sheet reverse side detects;
Fig. 4 is to 45Mn17Al
3low magnetic closes knot steel cold-reduced sheet surface and grinds off the composition profiles detection of doing after surperficial hard formation;
Fig. 5 is that annealing material rest of the present invention is briefly schemed.
Embodiment
For fully understanding the present invention's object, feature and effect, by following concrete embodiment, the present invention is elaborated.
The 45Mn17Al of contriver to prior art
3low magnetic closes knot steel cold-reduced sheet annealing surface hard formation and detects, as shown in Figure 1.Result shows that steel plate top layer exists the hard formation of about 0.1mm thickness, and table hard formation hardness doubles compared with body.
Follow the 45Mn17Al of contriver to prior art
3low magnetic closes knot steel cold-reduced sheet according to GB GB222-2006 sampling, adopts the method for GB223 to carry out chemical composition analysis.Fig. 2 is 45Mn17Al
3the composition profiles that low magnetic closes knot steel cold-reduced sheet front detects, and Fig. 3 is 45Mn17Al
3the composition profiles that low magnetic closes knot steel cold-reduced sheet reverse side detects, and X-coordinate is that the composition from surface to heart portion changes, and unit is micron, and ordinate zou is the percentage composition that element is relative.Result shows, the cold-reduced sheet of prior art anneal (steel plate) is shown in hard formation by inner Mn, AL, the N content higher trend gradually that manifests to surface.Fig. 4 is to 45Mn17Al
3low magnetic closes knot steel cold-reduced sheet surface and grinds off the composition profiles detection of doing after surperficial hard formation.Result demonstration, the inherent composition of cold-reduced sheet (steel plate) is basically identical.
Then, contriver with after the thorough pickling of hydrochloric acid, carries out cold bending test by the surperficial hard formation of cold-reduced sheet (steel plate), and result shows without clod wash surface crack.
So contriver draws the following conclusions: existing annealing technology can cause cold-reduced sheet (steel plate) upper and lower surface to have table hard formation, and surperficial hard formation is the major cause that causes clod wash surface crack.Contriver, with after the residual breast in the positive and negative surface of gasoline wiping cold-reduced sheet (steel plate), becomes the flat discharge hood furnace annealing of buttress, then carries out cold bending test, and result shows without clod wash surface crack.But turn over one by one, steel plate gasoline wiping efficiency is low, cost is high, have potential safety hazard.
The present invention adopts the vertical dress of cold-reduced sheet (steel plate) and will between cold-reduced sheet and cold-reduced sheet, by the method for reinforcing bar isolation, anneal, and prevents low magnetic to close knot steel cold-reduced sheet mass defect at the upper and lower surface generation table hard formation of steel plate in annealing process.
The invention provides the method for annealing that a kind of low magnetic closes knot steel cold-reduced sheet, adopt the vertical dress of cold-reduced sheet, and between cold-reduced sheet and cold-reduced sheet, the mode at interval is annealed, the method comprises the steps: first step, low magnetic is closed to knot steel cold rolling straight sheet pile is vertical to be loaded on the bin base plate of annealing material rest, obtain the cold rolling straight sheet pile of vertical dress; Second step, places steel bar spacer between every cold-reduced sheet of the cold rolling straight sheet pile after described vertical dress and cold-reduced sheet, with by individual cold-reduced sheet interval each other; Third step, steps up the upper and lower two ends of cold rolling straight sheet pile of vertical dress respectively with gripping unit; The 4th step, the cold rolling straight sheet pile after step 3 is processed adopts bell furnace to carry out anneal.
It shown in Fig. 5, is the annealing material rest that closes the annealing of knot steel cold-reduced sheet for low magnetic of the present invention.Shown in Fig. 5, this bin comprises bin base plate 1; At least two on the bin base plate 1 that be positioned at certain intervals arranged support post 2; On the bin base plate 1 between support post 2 oblique 3; And bin suspension hook (not shown).
Annealing material rest adopts the material with high temperature deformation resistance ability, preferably adopt 35-45mm, more preferably the 304 moderate stainless steel materials of cost that 40mm is thick are welded, comprise that bin base plate 1, support post 2, oblique 3, bin suspension hook all preferably adopt 35-45mm, the heat-resistance stainless steel plate that more preferably 40mm is thick.Annealing material rest physical dimension length, according to the design of annealing device size and product size, is convenient to put, operate, preferably the wide * of long * high=2400*2200*1400mm.For above-mentioned reasons, the row of the support post of annealing material rest does not have special stipulation, as long as can meet product size and annealing device dimensional requirement.Fig. 5 only illustrates the support post with 4 rows, and in fact, support post can be the above arbitrary value of at least two rows according to the size of annealing material rest, such as 6 rows, 7 rows, 8 rows etc.
Spacing between two row's support posts 2 does not have special regulation, as long as the spacing that can play the cold rolling straight sheet pile of support is all within protection scope of the present invention.Preferably, between two row's support posts 2, place the cold rolling straight sheet pile of 3-5 ton, the spacing between two row's support posts 2 be take 190-350mm as good.
Stand between individual cold-reduced sheet that is loaded on annealing material rest 1 and put out with steel bar spacer, increased labour intensity, and operational difficulty.The present invention is provided with (being preferably welded) oblique 3 on bin base plate, and its surface working is smooth, and cold-reduced sheet stands up on oblique 3 like this, and in the time of can being convenient to insert steel bar spacer, sled moves cold-reduced sheet.The preferred 25-45 degree in angle of inclination of oblique 3.
Low magnetic of the present invention closed knot steel cold-reduced sheet before annealing material rest, pass through the processing of raw material shearing, pickling, rolling.Be cut into conventional magnetic shear method, conventionally according to cold-reduced sheet and the size of the product needing, carry out.Acid pickling step is generally at 20-40 ℃ of temperature, at inorganic acid solution, in the hydrochloric acid soln of preferred mass concentration 8-15%, soaks 8-15 minute.Rolling step is generally and adopts conventional emulsions as refrigerant, adopts top roll :+0.05mm, lower roll: plain-barreled roll, through one or two rolling process, draught is 28.5-50%.Conventional emulsions generally includes base oil, emulsifying agent, extreme pressure anti-wear additives etc., preferably also comprises oxidation inhibitor, rust-preventive agent, sterilant etc.Base oil is generally animal grease or synthetic ester, tetramethylolmethane four oleic acid esters for example, trimethylolpropane tris oleic acid ester etc.Emulsifying agent is generally the tensio-active agent (for example mixture of OP-10 and petroleum sodium sulfonate) of HLB value 8-18, makes emulsion can form water-oil emulsion.Extreme pressure anti-wear additives is generally the polar compound of the elements such as sulfur-bearing, phosphorus, chlorine.The preferred emulsion of the present invention has following performance index, pH value 5～8, acid number < 15, saponification value 40～60, V40 ℃ of viscosity 35～55, flash-point >=150, pour point≤-5, PB value/Kg (kilocalorie is stung load) >=50,3% emulsification stability 24h≤3.0 soaps, ESI >=0.6.
In order further to improve plate shape, the cold-reduced sheet after annealing adopts conventional ten three-roll unbenders to align, and is rectified the steel plate yield strength limit: 850Mpa, is rectified steel plate maximum width: 2100mm, is rectified steel plate thickness: 2.5～6.0mm.After aligning, can meet standard completely and user uses processing request, then be cut into finished product.
Below by specific embodiment, set forth the present invention, one skilled in the art will appreciate that this should not be understood to the restriction to the claims in the present invention scope.
Embodiment of the present invention equipment used is as follows:
Embodiment of the present invention method for testing performance and equipment are as follows:
The embodiment of the present invention adopts low magnetic steel 45Mn17AL
3.The sampling method that adopts GB222-2006, the detection method of GB223 records following chemical composition.
| The trade mark | C | Si | Mn | P | S | AL |
| 45Mn17AL3 | 0.40～0.50 | ≤0.60 | 16～18 | ≤0.040 | ≤0.030 | 2.4～3.6 |
Low magnetic is closed to knot steel cold-reduced sheet blank and be cut into specification 7.0mm*1600mm*4700mm.
Low magnetic after shearing is closed to knot steel plate and carry out cleanup acid treatment, the processing parameter of pickling is in Table 1.
Table 1
| Pickling medium | Mass concentration % | Temperature ℃ | Soak time |
| Hydrochloric acid | 11 | 30 | 11 minutes |
Then, the low magnetic after cleanup acid treatment closes knot steel plate and is rolled processing, and concrete rolling treatment process parameter is in Table 2.The CMR-1 (its saponification value 50, V40 ℃ of viscosity 45, flash-point >=150) that the emulsion using is produced for Beijing Heng Tong lubricating oil company limited.
Table 2
Then, by the cold-reduced sheet after rolling, according to 4 tons, be that a buttress divides buttress, obtain altogether 7 buttress.Then adopt overhead traveling crane that cold rolling straight sheet pile is lifted in annealing material rest as shown in Figure 5, between every two support posts 2, place a cold rolling straight sheet pile, cold rolling like this straight sheet pile stands up on oblique 3.Above-mentioned annealing material rest preferred dimension for the wide * of long * high=2400*2200*1400mm, totally 8 arrange support posts (4 rows are only shown in figure), oblique angle of inclination is 30 degree.Use crowbar sled to move cold-reduced sheet, between the cold-reduced sheet after vertical dress and cold-reduced sheet, place the steel bar spacer of ￠ 12mm, by individual cold-reduced sheet interval each other.Get gripping unit, this gripping unit comprises the first steel plate bar and the second steel plate bar, and wherein the two ends of the first steel plate bar and the second steel plate bar are connected by screw simultaneously.Respectively cold-reduced sheet two ends are put between the first steel plate bar and the second steel plate bar of two gripping units, setting nut steps up.Then by annealing material rest and cold-reduced sheet as a whole, adopt overhead traveling crane to catch on the bin suspension hook of annealing material rest, be lifted in electricity cover stove.This electricity cover stove adopts two galvanic couples to insert, and a galvanic couple is furnace gas galvanic couple, and another galvanic couple is for compressing galvanic couple.Complete after aforesaid operations, pass into nitrogen protection, furnace pressure >=100Pa.
Open the drain tap on electricity cover stove outer cover top, electricity cover stove adopts 40 ℃/h of temperature rise rate to heat up, and is warmed up to 780 ℃ and keeps 5 hours, annealing process nitrogen protection.Then cold-reduced sheet is transported to outer cover, be cooled to≤come out of the stove after 280 ℃.Final gained trimmed size 5.0mm*1520mm*6000mm, then samples according to above-mentioned method and tests.The said products is aligned with ten three-roll unbenders, entrance opening degree 20mm, and exit opening degree 40mm, speed is 0.26m/s.
Embodiment 2-3
Table 3
| Pickling medium | Mass concentration % | Temperature ℃ | Soak | |
| Embodiment | ||||
| 2 | |
8 | 40 | 15 |
| Embodiment | ||||
| 3 | |
15 | 20 | 8 minutes |
Table 4
| Temperature rise rate ℃/h | Thermostat temperature ℃ | Constant temperature time (hour) | |
| |
20 | 750 | 6 |
| |
50 | 790 | 4 |
adopt above-mentioned mechanical property, cold-bending property, electromagnetic performance testing method, obtain following result.
Table 5 mechanical property and cold bending experiment result
The crooked pressure head diameter of D-, a-Cold Rolled Plate Thickness, 120 °-angle of bend
Table 6 magnetic experimental result
Experimental result from table 5, can draw the following conclusions, the low magnetic of embodiment 1-3 closes knot steel cold-reduced sheet and adopts vertical annealing of the present invention, tensile strength (σ b, MPa) >=600, yield strength σ 0.2 (MPa) is between 300-450, and extensibility δ 5 (%) >=25, meets the requirement of the low magnetic steel deck of boat for naval vessels.
From the experimental result of table 5, it can also be seen that, the sample of embodiment 1-3 carries out cold bending experiment under 120 ° of clod wash angles, and cold-reduced sheet surface does not crack.
From the experimental result of table 6, can find out, the sample of embodiment 1-3 carries out magnetic experiment, its relative magnetic permeability μ in 800A/m, 4000A/m, tri-kinds of magneticstrengties of 8000A/m
Гall≤1.2, meet the requirement of the low magnetic steel deck of boat for naval vessels.
Low magnetic is closed to knot steel cold-reduced sheet blank and be cut into specification 6.0mm*1600mm*1950mm.
Then, the low magnetic after shearing is closed to knot steel plate and carry out cleanup acid treatment, the processing parameter of pickling is in Table 7.
Table 7
| Pickling medium | Mass concentration % | Temperature ℃ | Soak time |
| Hydrochloric acid | 11 | 30 | 11 minutes |
Then, the low magnetic after cleanup acid treatment closes knot steel plate and is rolled processing, and concrete rolling treatment process parameter is in Table 8.The CMR-1 (its saponification value 50, V40 ℃ of viscosity 45, flash-point >=150) that the emulsion using is produced for Beijing Heng Tong lubricating oil company limited.
Table 8
Then, by the cold-reduced sheet after rolling, according to 5 tons, be that a buttress divides buttress, obtain altogether 6 buttress.Then adopt overhead traveling crane to be lifted in annealing material rest as shown in Figure 5, between every two support posts 2, place a cold rolling straight sheet pile, cold rolling like this straight sheet pile stands up on oblique 3.Above-mentioned annealing material rest preferred dimension for the wide * of long * high=2400*2200*1400mm, totally 7 arrange support posts (4 rows are only shown in figure), oblique angle of inclination is 30 degree.Use crowbar sled to move cold-reduced sheet, between the cold-reduced sheet after vertical dress and cold-reduced sheet, place the steel bar spacer of ￠ 14mm, by individual cold-reduced sheet interval each other.Get gripping unit, this gripping unit comprises the first steel plate bar and the second steel plate bar, and wherein the two ends of the first steel plate bar and the second steel plate bar are connected by screw simultaneously.Respectively cold-reduced sheet two ends are put between the first steel plate bar and the second steel plate bar of two gripping units, setting nut steps up.Then by annealing material rest and cold-reduced sheet as a whole, adopt overhead traveling crane to catch on the bin suspension hook of annealing material rest, be lifted in electricity cover stove.This electricity cover stove adopts two galvanic couples to insert, and a galvanic couple is furnace gas galvanic couple, and another galvanic couple is for compressing galvanic couple.Complete after aforesaid operations, pass into nitrogen protection, furnace pressure >=100Pa.
Open the drain tap on electricity cover stove outer cover top, electricity cover stove adopts 40 ℃/h of temperature rise rate to heat up, and is warmed up to 780 ℃ and keeps 5 hours, annealing process nitrogen protection.Then cold-reduced sheet is transported to outer cover, be cooled to≤come out of the stove after 280 ℃.Final gained trimmed size 4.0mm*1520mm*2500mm, then samples according to above-mentioned method and tests.The said products is aligned with ten three-roll unbenders, entrance opening degree 18mm, and exit opening degree 20mm, speed is 0.26m/s.。
Embodiment 5-6
Table 9
| Pickling medium | Mass concentration % | Temperature ℃ | Soak | |
| Embodiment | ||||
| 5 | |
8 | 40 | 15 minutes |
| Embodiment 6 | |
15 | 20 | 8 minutes |
Table 10
| Temperature rise rate ℃/h | Thermostat temperature ℃ | Constant temperature time (hour) | |
| |
30 | 760 | 6 |
| Embodiment 6 | 50 | 790 | 4 |
Adopt above-mentioned mechanical property, cold-bending property, electromagnetic performance testing method, obtain following result.
Table 11 mechanical property and cold bending experiment result
The crooked pressure head diameter of D-, a-Cold Rolled Plate Thickness, 120 °-angle of bend
Table 12 magnetic experimental result
Experimental result from table 11, can draw the following conclusions, the low magnetic of embodiment 4-6 closes knot steel cold-reduced sheet and adopts vertical annealing of the present invention, tensile strength (σ b, MPa) >=600, yield strength σ 0.2 (MPa) is between 300-450, and extensibility δ 5 (%) >=25, meets the requirement of the low magnetic steel deck of boat for naval vessels.
From the experimental result of table 11, it can also be seen that, the sample of embodiment 4-6 carries out cold bending experiment under 120 ° of clod wash angles, and cold-reduced sheet surface does not crack.
From the experimental result of table 12, can find out, the sample of embodiment 4-6 carries out magnetic experiment, its relative magnetic permeability μ in 800A/m, 4000A/m, tri-kinds of magneticstrengties of 8000A/m
Γall≤1.2, meet the requirement of the low magnetic steel deck of boat for naval vessels.
Embodiment 7
Low magnetic is closed to knot steel cold-reduced sheet blank and be cut into specification 6.0mm*1600mm*1500mm.
Then, the low magnetic after shearing is closed to knot steel plate and carry out cleanup acid treatment, the processing parameter of pickling is in Table 13.
Table 13
| Pickling medium | Mass concentration % | Temperature ℃ | Soak time |
| Hydrochloric acid | 11 | 30 | 11 minutes |
Then, the low magnetic after cleanup acid treatment closes knot steel plate and is rolled processing, and concrete rolling treatment process parameter is in Table 14.The CMR-1 (its saponification value 50, V40 ℃ of viscosity 45, flash-point >=150) that the emulsion using is produced for Beijing Heng Tong lubricating oil company limited.
Table 14
Then, by the cold-reduced sheet after rolling, according to 3 tons, be that a buttress divides buttress, obtain altogether 9 buttress.Then adopt overhead traveling crane that cold rolling straight sheet pile is lifted in annealing material rest as shown in Figure 5, between every two support posts 2, place a cold rolling straight sheet pile, cold rolling like this straight sheet pile stands up on oblique 3.Above-mentioned annealing material rest preferred dimension for the wide * of long * high=2400*2200*1400mm, totally 10 arrange support posts (4 rows are only shown in figure), oblique angle of inclination is 30 degree.Use crowbar sled to move cold-reduced sheet, between the cold-reduced sheet after vertical dress and cold-reduced sheet, place the steel bar spacer of ￠ 10mm, by individual cold-reduced sheet interval each other.Get gripping unit, this gripping unit comprises the first steel plate bar and the second steel plate bar, and wherein the two ends of the first steel plate bar and the second steel plate bar are connected by screw simultaneously.Respectively cold-reduced sheet two ends are put between the first steel plate bar and the second steel plate bar of two gripping units, setting nut steps up.Then by annealing material rest and cold-reduced sheet as a whole, adopt overhead traveling crane to catch on the bin suspension hook of annealing material rest, be lifted in electricity cover stove.This electricity cover stove adopts two galvanic couples to insert, and a galvanic couple is furnace gas galvanic couple, and another galvanic couple is for compressing galvanic couple.Complete after aforesaid operations, pass into nitrogen protection, furnace pressure >=100Pa.
Open the drain tap on electricity cover stove outer cover top, electricity cover stove adopts 40 ℃/h of temperature rise rate to heat up, and is warmed up to 780 ℃ and keeps 5 hours, annealing process nitrogen protection.Then cold-reduced sheet is transported to outer cover, be cooled to≤come out of the stove after 280 ℃.Final gained trimmed size 3.0mm*1520mm*2500mm, then samples according to above-mentioned method and tests.The said products is aligned with ten three-roll unbenders, entrance opening degree 15mm, and exit opening degree 18mm, speed is 0.26m/s.
Embodiment 8-9
Table 15
| Pickling medium | Mass concentration % | Temperature ℃ | Soak | |
| Embodiment | ||||
| 8 | |
8 | 40 | 15 minutes |
| Embodiment 9 | |
15 | 20 | 8 minutes |
Table 16
| Temperature rise rate ℃/h | Thermostat temperature ℃ | Constant temperature time (hour) | |
| |
35 | 770 | 6 |
| Embodiment 9 | 50 | 790 | 4 |
adopt above-mentioned mechanical property, cold-bending property, electromagnetic performance testing method, obtain following result.
Table 17 mechanical property and cold bending experiment result
The crooked pressure head diameter of D-, a-Cold Rolled Plate Thickness, 120 °-angle of bend
Table 18 magnetic experimental result
Experimental result from table 17, can draw the following conclusions, the low magnetic of embodiment 7-9 closes knot steel cold-reduced sheet and adopts vertical annealing of the present invention, tensile strength (σ b, MPa) >=600, yield strength σ 0.2 (MPa) is between 300-450, and extensibility δ 5 (%) >=25, meets the requirement of the low magnetic steel deck of boat for naval vessels.
From the experimental result of table 17, it can also be seen that, the sample of embodiment 7-9 carries out cold bending experiment under 120 ° of clod wash angles, and cold-reduced sheet surface does not crack.
From the experimental result of table 18, can find out, the sample of embodiment 7-9 carries out magnetic experiment, its relative magnetic permeability μ in 800A/m, 4000A/m, tri-kinds of magneticstrengties of 8000A/m
Гall≤1.2, meet the requirement of the low magnetic steel deck of boat for naval vessels.
What in the embodiment of the present invention, use is that steel grade is 45Mn17AL
3blank, there is very strong Work Hardening Characteristic, when total deformation rate surpasses 40% left and right, along with the increase of rolling pass, the difficulty that rolling becomes, reduction in pass declines rapidly, at 0.03～0.06mm.The finished product thickness specification needing for embodiment 7-9 is 3.0mm, adopts a rolling process, and rolling pass is in 20 passage left and right; Also two rolling processes (6.0mm----4.5mm----3.0mm) be can adopt, after softening annealing between twice rolling process (annealing process is carried out finished product annealing process), pickling, rolling, the technical process of annealing again carried out.
Claims (7)
1. low magnetic closes a method for annealing for knot steel cold-reduced sheet, and the method comprises the steps:
First step, closes low magnetic that knot steel cold rolling straight sheet pile is vertical to be loaded on the bin base plate of annealing material rest, obtains the cold rolling straight sheet pile of vertical dress;
Second step, places steel bar spacer between every cold-reduced sheet of the cold rolling straight sheet pile after described vertical dress and cold-reduced sheet, with by individual cold-reduced sheet interval each other;
Third step, steps up the upper and lower two ends of cold rolling straight sheet pile of vertical dress respectively with gripping unit; And
The 4th step, the cold rolling straight sheet pile after step 3 is processed adopts bell furnace to carry out anneal.
2. low magnetic according to claim 1 closes the method for annealing of knot steel cold-reduced sheet, it is characterized in that, in the 4th step, adopts 20-50 ℃/h of temperature rise rate to heat up, and is warmed up to 750-790 ℃ and keeps constant temperature 4-6h.
3. low magnetic according to claim 2 closes the method for annealing of knot steel cold-reduced sheet, it is characterized in that, in the 4th step, described temperature rise rate is 40 ℃/h, is warmed up to 780 ℃ and keeps constant temperature 5 hours.
4. low magnetic according to claim 1 closes the method for annealing of knot steel cold-reduced sheet, it is characterized in that, described bell furnace is electricity cover annealing furnace.
5. according to the low magnetic described in claim 1-4 any one, close the method for annealing of knot steel cold-reduced sheet, it is characterized in that, in first step, low magnetic is closed to knot steel cold-reduced sheet and divide buttress, obtain cold rolling straight sheet pile, then cold rolling straight sheet pile is stood and is loaded on the bin base plate of annealing material rest, between every two support posts, place a cold rolling straight sheet pile.
6. low magnetic according to claim 1 closes the method for annealing of knot steel cold-reduced sheet, it is characterized in that, in second step, the diameter of described steel bar spacer is ￠ 10-14mm.
7. low magnetic according to claim 1 closes the method for annealing of knot steel cold-reduced sheet, it is characterized in that, in third step, described gripping unit comprises the first steel plate bar and the second steel plate bar, and wherein the two ends of the first steel plate bar and the second steel plate bar are provided with movable fastening piece; Respectively cold rolling straight sheet pile two ends are put between the first steel plate bar and the second steel plate bar of two gripping units, regulated fastening piece to step up operation.
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| CN201132150Y (en) * | 2007-09-20 | 2008-10-15 | 中国北车集团北京二七机车厂有限责任公司 | Batch phosphating spray-processing rack for sheet material in vertical direction |
| CN102251093A (en) * | 2011-01-07 | 2011-11-23 | 柳燕明 | Integrated adjustable rack |
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| CN201132150Y (en) * | 2007-09-20 | 2008-10-15 | 中国北车集团北京二七机车厂有限责任公司 | Batch phosphating spray-processing rack for sheet material in vertical direction |
| CN102251093A (en) * | 2011-01-07 | 2011-11-23 | 柳燕明 | Integrated adjustable rack |
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