CN103909092B - A kind of heating once and rolling method of Cr12MoV cold-work die band steel - Google Patents
A kind of heating once and rolling method of Cr12MoV cold-work die band steel Download PDFInfo
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- CN103909092B CN103909092B CN201410110391.2A CN201410110391A CN103909092B CN 103909092 B CN103909092 B CN 103909092B CN 201410110391 A CN201410110391 A CN 201410110391A CN 103909092 B CN103909092 B CN 103909092B
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Abstract
The invention discloses a kind of heating once and rolling method of Cr12MoV cold-work die band steel, comprise shove charge, heating, rolling and annealing operation.Specifically every for steel ingot block gap 50 ~ 100mm is placed in the two slideway heating furnace of steel-pushing type, 1180 ~ 1200 DEG C are heated to through preheating, low temperature, high temperature and samming four-part form, come out of the stove and enter milling train, obtain band steel semi-finished product through a vertical flat upset, heating once and rolling, then obtain band steel finished product after slow cooling, annealing in process.The inventive method eliminates the process of usual steel ingot cogging, make the even how fiery rolling of two fire shorten to heating once and rolling to become a useful person, substantially reduce technological process, improve production efficiency, the energy resource consumption of ton steel is converted as standard coal is 0.177 ton, lower than average consumption coal level, production cost ton steel expense is only 800 yuan, lower than professional standard.
Description
Technical field
The present invention relates to the production technology of a kind of cold work die steel Cr12MoV, be specifically related to a kind of heating once and rolling method of Cr12MoV cold-work die band steel.
Background technology
Cold work die steel Cr12MoV is widely used in and manufactures that cold-punching mould, cold-heading are touched, cold extruding die and wire drawing die etc.The carbon content (mass percent) of Cr12MoV 1.45 ~ 1.70%, alloy Cr content at 11.00 ~ 12.50%, Mo at 0.40 ~ 0.60%, V 0.15 ~ 0.30%, belong to ledeburite steel.Cold work die steel in high alloy through thermoplasticity is poor, temperature and the uneven easy generation severe crack of distortion and the problem such as eutectic carbide is thick, uneven, cause such steel hot-working difficulty large, in production, great majority are with hammer cogging, Forging Technology production procedure is long, cost is high, lumber recovery is low, the particularly cold-work die steel plate of forging, not only production efficiency is low, and is also difficult to meet the demands in the stability of dimensional accuracy, glacing flatness, quality.
The rolling of existing Cr12MoV cold-work die band steel generally adopts two fiery rollings or two fiery forging methods.Disclosed in CN103316910A " a kind of milling method of Cr12MoV band steel ", the method adopts that the ingot casting heat being greater than 2 tons is sent, the heating of soaking pit hot charging ingot casting and the techniques such as the process that homogenizes, the fiery rolling of blooming mill two and annealing, solving cold work die steel ingot casting Cr12MoV in the past can not the technical problem of Direct Rolling band steel, but it is large to there is energy resource consumption, manufacturing cost is high, and the irregularity of eutectic carbides rank is usually higher than the deficiencies such as 3 grades.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art, there is provided one can by after Heating Steel Ingots, direct heating once and rolling can produce the Cr12MoV cold-work die band steel that width reaches 610mm, its the irregularity of eutectic carbides rank is not higher than 3 grades, and energy resource consumption is few, the heating once and rolling method of the Cr12MoV cold-work die band steel of low cost of manufacture.
The object of the present invention is achieved like this: a kind of heating once and rolling method of Cr12MoV cold-work die band steel, comprise shove charge, heating, rolling and annealing operation, every for steel ingot block gap 50 ~ 100mm is it is characterized in that to be placed in heating furnace, through preheating, low temperature, high temperature and samming four-part form are heated to 1180 ~ 1200 DEG C, come out of the stove and enter milling train, through vertical-flat upset, heating once and rolling, that is: rolling on edge → dephosphorization → upset → flat-rolled → sweep phosphorus → rolling on edge → sweep phosphorus → upset → flat-rolled → sweep phosphorus → rolling on edge → sweep phosphorus → upset → flat-rolled → sweep phosphorus → rolling on edge → sweep phosphorus → flat-rolled to obtain band steel semi-finished product, again through slow cooling, band steel finished product is obtained after annealing in process.
The temperature that described preheating, low temperature, high temperature and samming four-part form heat and temperature retention time are respectively: preheating section 600 ~ 800 DEG C, is incubated 0.5 ~ 1 hour, then is warming up to 1100 DEG C with the speed of≤100 DEG C/h; Low-temperature zone 1100 ~ 1120 DEG C, is incubated 2.5 ~ 3.5 hours, then is warming up to 1200 DEG C with the speed of≤50 DEG C/h; High temperature section 1200 ~ 1220 DEG C, is incubated 1.5 ~ 2 hours; Samming section 1180 ~ 1200 DEG C, is incubated 1.0 ~ 1.5 hours.
The idiographic flow of described vertical-flat upset, heating once and rolling is: steel ingot comes out of the stove → 1 passage rolling on edge → dephosphorize by high pressure water → turn over turnback → 4 passage flat-rolled → high speed to sweep phosphorus → 2 passage rolling on edge → high speed and sweep phosphorus → turn over turnback → 4 passage flat-rolled → high speed and sweep phosphorus → 4 passage rolling on edge → high speed and sweep phosphorus → turn over turnback → 8 passage flat-rolled → high speed and sweep phosphorus → 2 passage rolling on edge → high speed and sweep phosphorus → 1 passage flat-rolled → school limit → crop → leveling head → collection → incubator slow cooling.
Described annealing in process be by slow cooling after band steel stack and deliver to annealing furnace, be first warming up to 870 ~ 900 DEG C with the speed of≤40 DEG C/h, be incubated 4.5 hours, then be down to room temperature with the speed of 45 DEG C/h and come out of the stove.
Described steel ingot start rolling temperature is 1160 ~ 1180 DEG C, and finishing temperature is 920 ~ 950 DEG C.
Described heating furnace adopts pusher-type furnace, and this stove is a kind of two slideway heater for rolling steel, the applicant's separate case application.Slideway in stove is two groups, often organizes slideway and comprises two one slide rails, slide rail is provided with groove, is placed with N pitch circle shape and pushes away rod iron in groove, and often joint pushes away the length of rod iron is 250 ~ 280mm, and diameter is 80 ~ 100mm.During use, feeder pushes away rod iron by promotion, interval is placed in the steel ingot pushed away on rod iron and is transferred in burner hearth.
Compared with prior art, advantage of the present invention is:
1, homogeneous heating, effective.Because heating furnace of the present invention adopts special two slideway pusher-type furnaces, steel billet interval is placed in and slideway sliding rail groove pushes away on rod iron, steel ingot is only with the contact surface pushing away rod iron the top pushing away rod iron cambered surface, the impetus of feeder is in the side pushing away rod iron, by pushing away rod iron, interval is placed in the steel ingot pushed away on rod iron to be transferred in burner hearth, interval is left by between heating steel ingot due to two pieces, can not arch camber be out of shape when being heated to high temperature, simultaneously narrower with the contact surface pushing away rod iron by heating steel ingot, in addition interval is left between two blocks of steel billets, make to be added steel ingot to be heated uniformly in burner hearth, the black print of the temperature difference can not be produced, heating effect is good, meet the requirement that heating once and rolling is become a useful person.
2, flow process is short, efficiency is high.The present invention adopts 1.24 tons of rectangle steel ingots, push away interval on rod iron in circle to put, through preheating, low temperature, high temperature and samming four-part form homogeneous heating, go out width reach 610mm, the irregularity of eutectic carbides not higher than the Cr12MoV cold-work die band steel of 3 grades through Li-Ping upset, heating once and rolling again, eliminate the process of usual steel ingot cogging, make the even how fiery rolling of two fire shorten to heating once and rolling to become a useful person, substantially reduce technological process, improve production efficiency.
3, less energy consumption, cost are low.Use the Cr12MoV cold-work die band steel that the inventive method is produced, the energy resource consumption of ton steel is converted as standard coal is 0.177 ton, and lower than average consumption coal level, production cost ton steel expense is only 800 yuan, lower than professional standard.
4, steady quality, repeatability are high.The present invention adopts the method for one-heating forming to produce, and internal soundness is even, avoids the mixed crystal that heating for multiple times causes, constant product quality, reliable, and repeatability is high.
Accompanying drawing explanation
Fig. 1 is present invention process flow chart.
Detailed description of the invention
The invention will be further described by reference to the accompanying drawings for following examples.
Embodiment 1
Band steel trimmed size: wide × thick=610mm × 50mm
Choose 1.24 tons of Cr12MoV rectangle steel ingots, steel ingot heavy in section is 640mm × 190mm, and small bore is 620mm × 190mm, is highly 1300mm.In the groove of slide rail, place the circle that N joint length is 250mm, diameter is 85mm push away rod iron, steel ingot is placed in circle with interval 50mm and pushes away on rod iron, feeder promotion circle pushes away rod iron makes steel ingot enter heating furnace.Steel ingot is through four-part form homogeneous heating, and wherein preheating section temperature 600 DEG C, is incubated 0.5 hour, then is warming up to 1100 DEG C with the speed of≤100 DEG C/h; Low-temperature zone temperature 1100 DEG C, is incubated 2.5 hours, then is warming up to 1200 DEG C with the speed of≤50 DEG C/h; High temperature section temperature 1200 DEG C, is incubated 1.5 hours; Samming section temperature 1180 DEG C, is incubated after 1.0 hours, rolling of coming out of the stove.Steel ingot start rolling temperature 1160 DEG C, sweep phosphorus → 2 passage rolling on edge → high speed through 1 passage rolling on edge → dephosphorize by high pressure water → turn over turnback → 4 passage flat-rolled → high speed to sweep phosphorus → turn over turnback → 4 passage flat-rolled → high speed and sweep phosphorus → 4 passage rolling on edge → high speed and sweep phosphorus → turn over turnback → 8 passage flat-rolled → high speed and sweep phosphorus → 2 passage rolling on edge → high speed and sweep phosphorus → 1 passage flat-rolled, finishing temperature 950 DEG C.Again after the limit → crop → leveling head → collection of school, enter incubator slow cooling.Band steel block-by-block overlap after rolling is put in annealing furnace, is warming up to 870 DEG C with the speed of≤40 DEG C/h, be incubated after 4.5 hours, then with the cooling of the speed of 45 DEG C/h, stove is chilled to room temperature and comes out of the stove.
610mm × 50mm band steel product inspection result: eutectic carbide: 3 grades; Annealing hardness: HB225.
Embodiment 2
Band steel trimmed size: wide × thick=310mm × 20mm
Choose 1.24 tons of Cr12MoV rectangle steel ingots, steel ingot sectional dimension: heavy in section is 640mm × 190mm, small bore is 620mm × 190mm, and steel ingot height is 1300mm.In the groove of slide rail, place the circle that N joint length is 280mm, diameter is 95mm push away rod iron, steel ingot is placed in circle with interval 100mm and pushes away on rod iron, feeder promotion circle pushes away rod iron makes steel ingot enter heating furnace; The preheating section temperature of steel ingot in heating furnace 800 DEG C, is incubated 1.0 hours, then is warming up to 1120 DEG C with the speed of≤100 DEG C/h; Low-temperature zone temperature 1120 DEG C, is incubated 3.5 hours, then is warming up to 1220 DEG C with the speed of≤50 DEG C/h; High temperature section temperature 1220 DEG C, is incubated 2 hours; Samming section temperature 1200 DEG C, is incubated after 1.5 hours, rolling of coming out of the stove.Steel ingot start rolling temperature 1180 DEG C, sweep phosphorus → 2 passage rolling on edge → high speed through 1 passage rolling on edge → dephosphorize by high pressure water → turn over turnback → 4 passage flat-rolled → high speed to sweep phosphorus → turn over turnback → 4 passage flat-rolled → high speed and sweep phosphorus → 4 passage rolling on edge → high speed and sweep phosphorus → turn over turnback → 8 passage flat-rolled → high speed and sweep phosphorus → 2 passage rolling on edge → high speed and sweep phosphorus → 1 passage flat-rolled, finishing temperature 920 DEG C; Again after the limit → crop → leveling head → collection of school, enter incubator slow cooling.Put in annealing furnace by the band steel block-by-block overlap after rolling, be warming up to 900 DEG C with the speed of≤40 DEG C/h, be incubated after 4.5 hours, lower the temperature with 45 DEG C/h, stove is chilled to room temperature and comes out of the stove.
310mm × 20mm band steel product inspection result: eutectic carbide: 2 grades; Annealing hardness: HB220.
Claims (3)
1. the heating once and rolling method of a Cr12MoV cold-work die band steel, comprise shove charge, heating, rolling and annealing operation, every for steel ingot block gap 50 ~ 100mm is it is characterized in that to be placed in heating furnace, through preheating, low temperature, high temperature and samming four-part form are heated to 1180 ~ 1200 DEG C, come out of the stove and enter milling train, sweep phosphorus → 2 passage rolling on edge → high speed through 1 passage rolling on edge → dephosphorize by high pressure water → turn over turnback → 4 passage flat-rolled → high speed to sweep phosphorus → turn over turnback → 4 passage flat-rolled → high speed and sweep phosphorus → 4 passage rolling on edge → high speed and sweep phosphorus → turn over turnback → 8 passage flat-rolled → high speed and sweep phosphorus → 2 passage rolling on edge → high speed and sweep phosphorus → 1 passage flat-rolled and obtain band steel semi-finished product, again through slow cooling, band steel finished product is obtained after annealing in process.
2. the heating once and rolling method of a kind of Cr12MoV cold-work die band steel according to claim 1, it is characterized in that the temperature that described preheating, low temperature, high temperature and samming four-part form heat and temperature retention time are respectively: preheating section 600 ~ 800 DEG C, be incubated 0.5 ~ 1 hour, then be warming up to 1100 DEG C with the speed of≤100 DEG C/h; Low-temperature zone 1100 ~ 1120 DEG C, is incubated 2.5 ~ 3.5 hours, then is warming up to 1200 DEG C with the speed of≤50 DEG C/h; High temperature section 1200 ~ 1220 DEG C, is incubated 1.5 ~ 2 hours; Samming section 1180 ~ 1200 DEG C, is incubated 1.0 ~ 1.5 hours.
3. the heating once and rolling method of a kind of Cr12MoV cold-work die band steel according to claim 1, it is characterized in that described annealing in process be by slow cooling after band steel stack and deliver to annealing furnace, first be warming up to 870 ~ 900 DEG C with the speed of 40 DEG C/h, be incubated 4.5 hours, then be down to room temperature with the speed of 45 DEG C/h and come out of the stove.
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| CN104624696A (en) * | 2014-12-09 | 2015-05-20 | 抚顺特殊钢股份有限公司 | Material forming method for D2 steel and 2.8-ton steel ingot by one-time rolling |
| CN104550238B (en) * | 2014-12-29 | 2017-01-18 | 攀钢集团江油长城特殊钢有限公司 | Production method of cold work die steel |
| CN106903163A (en) * | 2017-03-24 | 2017-06-30 | 攀钢集团江油长城特殊钢有限公司 | A kind of thick flat bar and its milling method |
| CN107299215B (en) * | 2017-08-17 | 2018-07-06 | 湖北楠田工模具科技有限公司 | It is a kind of to go out to push away the sheet furnace of rod iron certainly |
| CN109759475A (en) * | 2019-01-14 | 2019-05-17 | 舞阳钢铁有限责任公司 | A kind of steel ingot is become a useful person the milling method of ultra-wide super thick Cr-Mo steel plate |
| CN113843283A (en) * | 2021-09-28 | 2021-12-28 | 成都先进金属材料产业技术研究院股份有限公司 | Preparation method of large-size cold-work die steel billet |
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