CN104624696A - Material forming method for D2 steel and 2.8-ton steel ingot by one-time rolling - Google Patents
Material forming method for D2 steel and 2.8-ton steel ingot by one-time rolling Download PDFInfo
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- CN104624696A CN104624696A CN201410742528.6A CN201410742528A CN104624696A CN 104624696 A CN104624696 A CN 104624696A CN 201410742528 A CN201410742528 A CN 201410742528A CN 104624696 A CN104624696 A CN 104624696A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 70
- 239000010959 steel Substances 0.000 title claims abstract description 70
- 238000005096 rolling process Methods 0.000 title claims abstract description 55
- 238000000034 method Methods 0.000 title claims abstract description 27
- 239000000463 material Substances 0.000 title claims abstract description 16
- 229910001263 D-2 tool steel Inorganic materials 0.000 title abstract description 3
- 238000010438 heat treatment Methods 0.000 claims abstract description 28
- 230000002441 reversible effect Effects 0.000 claims abstract description 7
- 230000014759 maintenance of location Effects 0.000 claims description 4
- 239000000498 cooling water Substances 0.000 claims description 3
- 238000005520 cutting process Methods 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 5
- 238000003754 machining Methods 0.000 abstract 1
- 241001062472 Stokellia anisodon Species 0.000 description 10
- 238000000137 annealing Methods 0.000 description 8
- 239000011651 chromium Substances 0.000 description 6
- 239000000203 mixture Substances 0.000 description 6
- 238000010079 rubber tapping Methods 0.000 description 6
- 239000000126 substance Substances 0.000 description 6
- 239000002893 slag Substances 0.000 description 4
- 229910052799 carbon Inorganic materials 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 238000003723 Smelting Methods 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 238000009749 continuous casting Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000010436 fluorite Substances 0.000 description 1
- 238000005242 forging Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 229910001349 ledeburite Inorganic materials 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/02—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling heavy work, e.g. ingots, slabs, blooms, or billets, in which the cross-sectional form is unimportant ; Rolling combined with forging or pressing
- B21B1/026—Rolling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B15/0007—Cutting or shearing the product
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/46—Roll speed or drive motor control
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/064—Dephosphorising; Desulfurising
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/076—Use of slags or fluxes as treating agents
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/10—Handling in a vacuum
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Abstract
The invention discloses a material forming method for D2 steel and 2.8-ton steel ingot by one-time rolling. The material forming method comprises the following steps: preferably adopting a 2.8-ton ingot type; simplifying a steel ingot heating curve, and adopting one-section heating; and adopting a two-roller reversible type 850 blooming mill for repeatedly rolling by heating once with 15-23 passes to form materials, wherein the number of the rolling passes and the reduction in each pass are ensured in a rolling process, so as to satisfy the machining rate. The material forming method disclosed by the invention has the following advantages: (1) the 2.8-ton ingot type is adopted, so that the molten steel yield is increased in a maximized manner; and the size of an ingot body meets the requirements on direct rolling of the mill; (2) the one-section heating is adopted, so that the heating time is shortened, the gas consumption is reduced, and the production efficiency is improved; (3) the two-roller reversible type 850 blooming mill is adopted for one-time rolling with multiple passes, so that the efficiency is improved, and the cost is reduced; and the steel internal texture is delicate, and the surface, size and shape can meet the technical requirements; and (4) the material forming method breaks through the bottleneck link of a production process route of steel ingot above 2.8 tons of such steel, and fills in the blank of the steel for form materials by one-time rolling.
Description
Technical field
The invention belongs to cold-work die steel rolling band steel manufacture method, be specifically related to a kind of D2 class steel 2.8 tons of steel ingot heating once and rollings and become a useful person method.
Background technology
D2 class steel is the high carbon and chromium cold work die steel extensively adopted in the world, has high quenching degree, hardenability and high wearability; High-temperature oxidation resistance is good, and heat treatment deformation is little; Various high accuracy, long-life cold-work die, cutlery and measurer should be manufactured, such as complex-shaped punching concave die, cold extruding die, screw plate, cold shears cutting knife and fine measuring instrument etc.D2 class steel mainly comprises D2, 1.2379, SKD11, Cr12Mo1V1, the steel grades such as Cr12MoV, belong to high-carbon, high alloy ledeburite steel, high-temp plastic is poor, hot processing temperature narrow range, easily surface is there is in rolling deformation process, the defect such as corner crack and underbead crack, at present 130mm finished product band steel is greater than for D2 class steel thickness, more than 2 tons steel ingots are used to produce, the technique of domestic and international factory many employings hammer cogging or " soaking pit heating steel ingot (continuous casting billet)+fiery rolling of blooming mill two ", heating curves is complicated simultaneously, be generally three sections to heat to four-part form, there is cost high, cycle is long, the shortcomings such as limit production.
Summary of the invention
The present invention discloses a kind of D2 class steel 2.8 tons of steel ingot heating once and rollings and to become a useful person method, adopts two-roller reversible formula 850 blooming mill one fire, is become a useful person by multi-pass repeat-rolling, ensure steel internal soundness and surface quality qualified.
For achieving the above object, the technical scheme that the present invention takes is:
1.D2 class rolling band steel, its chemical composition should meet table 1 and specify.
Table 1 %
2.D2 class steel uses 2.8 tons of ingot heating once and rolling methods, comprises the steps:
(1) according to table 1 predetermined component, EAF+LF+VD smelting is carried out to D2 class steel:
1. EAF smelting process adds lime, fluorite, makes the fusing slag of good fluidity, and in order to early stage dephosphorization, prevent molten steel from absorbing gas, suitable oxygen blast and Jia Kuang, stream slag changes slag, reduces phosphorus element content;
2. LF stove white slag is smelted, and the retention time is greater than 30min;
3. VD stove vacuum is less than 1mbar, and the retention time is greater than 15min.
4. Ar gas 10min ~ 15min is blown in ladle before cast.
5 cast, 2.8 tons of steel ingot (see figure 1)s, control pouring temperature 1460 DEG C ~ 1480 DEG C, ensure the inner as-cast structure of steel ingot.
(2) adopt two-roller reversible formula 850 blooming mill mill product, be divided into four steps:
The first step, Heating Steel Ingots:
1. heating-up temperature is 1150 DEG C ~ 1200 DEG C, and temperature retention time is 5h ~ 8h;
2. heating process is with ingot Wen Weizhu, at any time adjustment form temperature;
Second step, rolling-cogging:
1. cooling water is closed during rolling, in advance preheated nip roll;
2. according to mill product size, 15 ~ 23 passages are repeatedly rolled; Concrete passage technique is in table 2 ~ 5(unit: mm):
The flat technique of table 2 2.8t ingot rolling 130mm ~ 150mm × 600mm ~ 630mm
The flat technique of table 3 2.8t ingot rolling 140mm ~ 170mm × 540mm ~ 570mm
The flat technique of table 4 2.8t ingot rolling 160mm ~ 190mm × 430mm ~ 460mm
The flat technique of table 5 2.8t ingot rolling 240mm ~ 270mm × 290mm ~ 320mm
3. interior tissue is improved, draught per pass 10mm ~ 30mm by controlling different passage different vertical direction drafts;
4. roll rotational speed 30r/min ~ 60r/min;
5. last two passages adjust according to actual conditions, qualified to ensure finish to gauge product size, finished product material size 130mm ~ 270mm × 290mm ~ 630mm;
6. finishing temperature is not less than 850 DEG C;
3rd step, use 10MN cutting machine according to the rules length is cut off;
(3) finished product material rolls and redly send annealing, annealing temperature 890 DEG C ~ 900 DEG C afterwards.
(4) 3 groups of ultrasonic examinations in SEP1921 pressed by finished product material, and credit rating meets D/d level.
Analysis and theoretical explanation to technical scheme:
1. ingot shape is selected: according to 30 tons of electric furnace steel tapping amounts, adopt 2.8 tons of steel ingots, the pourable 2.8 tons of slab ingots 11 of every stove, improves molten steel lumber recovery to greatest extent; Meanwhile, the requirement of 2.8 tons of ingot ingot body size conforms milling train Direct Rollings, is beneficial to the execution of the technological parameter of the every a time of the operation of rolling.
2. Heating Steel Ingots curve is simplified: optimize traditional preheating, low temperature, high temperature and samming etc. three sections to four-part form heating, adopt one-part form heating, shorten the heat time, ensure that steel ingot burns thoroughly, reduce gas consumption, enhance productivity.
3. two-roller reversible formula 850 blooming mill heating once and rolling is adopted to become a useful person: by a fiery multi-pass repeat-rolling, the operation of rolling ensures rolling pass number, draught per pass, meet technological requirement processing ratio, steel interior tissue is careful, surface and form factor can reach technical requirement.
The present invention compared with prior art, has following advantages:
1. optimize ingot shape, adopt 2.8 tons of steel ingots;
2. changed by 850 blooming mill heating once and rollings by forging machine+eight 50 blooming mill associating cogging, carry
High efficiency, reduces costs.
3. adopt two-roller reversible formula 850 blooming mill multi-pass rolling, ensure steel internal soundness and table
Face quality, form factor meet technical requirement.
4. D2 class steel uses 2.8 tons of steel ingot heating once and rollings to become a useful person, and breaches the bottleneck of this type of steel more than 2 tons steel ingot production process routes, has filled up this type of high-carbon, blank that high alloy, less-deformable steel kind use 2.8 tons of steel ingot heating once and rollings to become a useful person.
Accompanying drawing explanation
Fig. 1 is 2.8 tons of Ingot Type diagrams.
Detailed description of the invention
Describe the present invention with embodiment by reference to the accompanying drawings.
Embodiment 1 ~ embodiment 5 following steps are identical:
3. breaking down subsidiary factory is by Heating Steel Ingots to 1180 DEG C, rolling of coming out of the stove after insulation 8h.
4. close cooling water during rolling, in advance preheated nip roll; Every time drafts being no more than 50mm of front 4 passages distributes, multi-pass repeat-rolling subsequently, draught per pass 10mm ~ 30mm, controls rotating speed 30r/min ~ 60r/min.
6. quality inspection, the steel billet of annealing after coming out of the stove is by SEP1921 ultrasonic examination, and credit rating meets D/d rank, and surface inspection is qualified.
Embodiment 1
1. smelt subsidiary factory and produce SKD11 steel grade, trimmed size requires 155mm × 570mm (thick+5/0; Wide+10/-0), steel ingot chemical composition is in table 6.
Table 6 %
| C | Mn | Si | S | P | Cr | Mo | V |
| 1.463 | 0.48 | 0.25 | 0.005 | 0.021 | 11.42 | 0.96 | 0.37 |
2. adopt EAF+LF+VD mode to smelt, VD tapping temperature 1462 DEG C, pours into a mould 2.8 tons
Steel ingot (see figure 1) 11, Hong Song breaking down subsidiary factory.
4. multi-pass repeat-rolling:
Original width 650mm thickness 460mm
1st passage width 620mm thickness 460mm
2nd passage width 590mm thickness 460mm
3rd passage width 590mm thickness 430mm
4th passage width 595mm thickness 400mm
5th passage width 600mm thickness 370mm
6th passage width 605mm thickness 340mm
7th passage width 575mm thickness 345mm
8th passage width 580mm thickness 315mm
9th passage width 585mm thickness 285mm
10th passage width 590mm thickness 255mm
11st passage width 595mm thickness 225mm
12nd passage width 600mm thickness 195mm
13rd passage width 605mm thickness 175mm
14th passage width 575mm thickness 180mm
15th passage width 578mm thickness 160mm surveys chi
5. finishing temperature 865 DEG C, finished product material rolls and redly send annealing afterwards, eliminates in the operation of rolling in producing
Stress.
Embodiment 2
1. smelt subsidiary factory and produce D2 steel grade, trimmed size requires 185mm × 460mm (thick+5/0; Wide+10/-0), steel ingot chemical composition is in table 7.
Table 7 %
| C | Mn | Si | S | P | Cr | Mo | V |
| 1.460 | 0.36 | 0.45 | 0.005 | 0.023 | 11.46 | 0.79 | 0.57 |
2. adopt EAF+LF+VD mode to smelt, VD tapping temperature 1465 DEG C, pours into a mould 2.8 tons of steel ingot (see figure 1)s 11, Hong Song breaking down subsidiary factory.
4. multi-pass repeat-rolling:
Original width 650mm thickness 460mm
1st passage width 620mm thickness 460mm
2nd passage width 590mm thickness 460mm
3rd passage width 560mm thickness 460mm
4th passage width 530mm thickness 460mm
5th passage width 530mm thickness 430mm
6th passage width 535mm thickness 400mm
7th passage width 540mm thickness 370mm
8th passage width 545mm thickness 340mm
9th passage width 515mm thickness 345mm
10th passage width 520mm thickness 315mm
11st passage width 525mm thickness 285mm
12nd passage width 530mm thickness 255mm
13rd passage width 535mm thickness 225mm
14th passage width 540mm thickness 205mm
15th passage width 545mm thickness 185mm
16th passage width 515mm thickness 190mm
17th passage width 485mm thickness 195mm
18th passage width 465mm thickness 200mm
19th passage width 468mm thickness 190mm surveys chi
5. finishing temperature 871 DEG C, finished product material rolls and redly send annealing afterwards, eliminates the internal stress produced in the operation of rolling.
Embodiment 3
1. smelt subsidiary factory and produce SKD11 steel grade, trimmed size requires 155mm × 570mm (thick+5/0; Wide+10/-0), steel ingot chemical composition is in table 8.
Table 8 %
| C | Mn | Si | S | P | Cr | Mo | V |
| 1.547 | 0.31 | 0.27 | 0.004 | 0.022 | 11.45 | 0.78 | 0.95 |
2. adopt EAF+LF+VD mode to smelt, VD tapping temperature 1460 DEG C, pours into a mould 2.8 tons of steel ingot (see figure 1)s 11, Hong Song breaking down subsidiary factory;
4. multi-pass repeat-rolling:
Original width 650mm thickness 460mm
1st passage width 650mm thickness 440mm
2nd passage width 650mm thickness 410mm
3rd passage width 650mm thickness 380mm
4th passage width 655mm thickness 350mm
5th passage width 640mm thickness 350mm
6th passage width 645mm thickness 320mm
7th passage width 650mm thickness 300mm
8th passage width 620mm thickness 300mm
9th passage width 625mm thickness 280mm
10th passage width 630mm thickness 250mm
11st passage width 635mm thickness 220mm
12nd passage width 640mm thickness 190mm
13rd passage width 645mm thickness 160mm
14th passage width 635mm thickness 160mm surveys chi
5. finishing temperature 883 DEG C, finished product material rolls and redly send annealing afterwards, eliminates in the operation of rolling in producing
Stress.
Embodiment 4
1. smelt subsidiary factory and produce Cr12Mo1V1 steel grade, trimmed size requires 245mm × 320mm (thick+5/0; Wide+10/-0), steel ingot chemical composition is in table 9.
Table 9 %
| C | Mn | Si | S | P | Cr | Mo | V |
| 1.476 | 0.49 | 0.41 | 0.004 | 0.024 | 11.42 | 0.88 | 0.63 |
2. adopt EAF+LF+VD mode to smelt, VD tapping temperature 1465 DEG C, pours into a mould 2.8 tons of steel ingot (see figure 1)s 11, Hong Song breaking down subsidiary factory;
4. multi-pass repeat-rolling:
Original width 650mm thickness 460mm
1st passage width 630mm thickness 460mm
2nd passage width 600mm thickness 460mm
3rd passage width 570mm thickness 460mm
4th passage width 540mm thickness 460mm
5th passage width 540mm thickness 430mm
6th passage width 545mm thickness 400mm
7th passage width 550mm thickness 370mm
8th passage width 555mm thickness 340mm
9th passage width 560mm thickness 320mm
10th passage width 540mm thickness 320mm
11st passage width 510mm thickness 325mm
12nd passage width 480mm thickness 330mm
13rd passage width 485mm thickness 300mm
14th passage width 455mm thickness 305mm
15th passage width 425mm thickness 310mm
16th passage width 395mm thickness 315mm
17th passage width 370mm thickness 320mm
18th passage width 375mm thickness 300mm
19th passage width 345mm thickness 305mm
20th passage width 320mm thickness 310mm
21st passage width 325mm thickness 280mm
22nd passage width 330mm thickness 250mm surveys chi
5. finishing temperature 860 DEG C, finished product material rolls and redly send annealing afterwards, eliminates in the operation of rolling in producing
Stress.
Embodiment 5
1. smelt subsidiary factory and produce Cr12MoV steel grade, trimmed size requires 145mm × 575mm (thick+5/0; Wide+10/-0), steel ingot chemical composition is in table 10.
Table 10 %
| C | Mn | Si | S | P | Cr | Mo | V |
| 1.54 | 0.18 | 0.33 | 0.003 | 0.018 | 11.36 | 0.46 | 0.19 |
2. adopt EAF+LF+VD mode to smelt, VD tapping temperature 1460 DEG C, pours into a mould 2.8 tons of steel ingots
(see figure 1) 11, Hong Song breaking down subsidiary factory;
4. multi-pass repeat-rolling:
Original width 650mm thickness 460mm
1st passage width 620mm thickness 460mm
2nd passage width 590mm thickness 460mm
3rd passage width 590mm thickness 430mm
4th passage width 595mm thickness 400mm
5th passage width 600mm thickness 370mm
6th passage width 605mm thickness 340mm
7th passage width 575mm thickness 345mm
8th passage width 580mm thickness 315mm
9th passage width 585mm thickness 285mm
10th passage width 590mm thickness 255mm
11st passage width 595mm thickness 225mm
12nd passage width 600mm thickness 195mm
13rd passage width 605mm thickness 175mm
14th passage width 575mm thickness 180mm
15th passage width 580mm thickness 150mm surveys chi
5. finishing temperature 864 DEG C, finished product material rolls and redly send annealing afterwards, eliminates the internal stress produced in the operation of rolling.
Claims (3)
1. D2 class steel 2.8 tons of steel ingot heating once and rollings are become a useful person a method, it is characterized in that: preferably 2.8 tons of ingot shapes, adopt two-roller reversible formula 850 blooming mill one fire, are become a useful person by 15 ~ 23 passage repeat-rollings.
2. D2 class steel 2.8 tons of steel ingot heating once and rollings are become a useful person method according to claim 1, it is characterized in that: state heating once and rolling method, comprise following three steps:
The first step, Heating Steel Ingots:
1. heating-up temperature is 1150 DEG C ~ 1200 DEG C, and temperature retention time is 5h ~ 8h;
2. heating process is with ingot Wen Weizhu, at any time adjustment form temperature;
Second step, rolling-cogging:
1. cooling water is closed during rolling, in advance preheated nip roll;
2. according to mill product size, 15 ~ 23 passages are repeatedly rolled;
3. interior tissue is improved, draught per pass 10mm ~ 30mm by controlling different passage different vertical direction drafts;
4. roll rotational speed 30r/min ~ 60r/min;
5. last two passages adjust according to actual conditions, qualified to ensure finish to gauge product size, finished product material size 130mm ~ 270mm × 290mm ~ 630mm;
6. finishing temperature is not less than 850 DEG C;
3rd step, use 10MN cutting machine according to the rules length is cut off.
3. according to claim 1 or 3, D2 class steel 2.8 tons of steel ingot heating once and rollings are become a useful person method, it is characterized in that: describedly repeatedly roll 15 ~ 23 passages, and concrete passage technique is in table 2 ~ 5:
The flat technique of table 2 2.8t ingot rolling 130mm ~ 150mm × 600mm ~ 630mm
The flat technique of table 3 2.8t ingot rolling 140mm ~ 170mm × 540mm ~ 570mm
The flat technique of table 4 2.8t ingot rolling 160mm ~ 190mm × 430mm ~ 460mm
The flat technique of table 5 2.8t ingot rolling 240mm ~ 270mm × 290mm ~ 320mm
。
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| Application Number | Priority Date | Filing Date | Title |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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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| JP2012183580A (en) * | 2011-02-18 | 2012-09-27 | Kobe Steel Ltd | Method of manufacturing original material for wire rod rolling |
| CN103316910A (en) * | 2012-03-21 | 2013-09-25 | 宝山钢铁股份有限公司 | Cr12MoV flat steel rolling method |
| CN103352171A (en) * | 2013-07-12 | 2013-10-16 | 抚顺特殊钢股份有限公司 | High-alloy steel D2 rolling method |
| CN103909092A (en) * | 2014-03-24 | 2014-07-09 | 湖北时力模具材料有限公司 | One-fire rolling method for Cr12MoV cold working die flat steel |
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2014
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| JP2002307101A (en) * | 2001-04-13 | 2002-10-22 | Daido Steel Co Ltd | Method for bloming continuously cast steel ingot |
| CN102581000A (en) * | 2011-01-10 | 2012-07-18 | 宝山钢铁股份有限公司 | Production method for rolling and cogging big cast ingot of high-carbon high-alloy cold-working die steel |
| JP2012183580A (en) * | 2011-02-18 | 2012-09-27 | Kobe Steel Ltd | Method of manufacturing original material for wire rod rolling |
| CN103316910A (en) * | 2012-03-21 | 2013-09-25 | 宝山钢铁股份有限公司 | Cr12MoV flat steel rolling method |
| CN103352171A (en) * | 2013-07-12 | 2013-10-16 | 抚顺特殊钢股份有限公司 | High-alloy steel D2 rolling method |
| CN103909092A (en) * | 2014-03-24 | 2014-07-09 | 湖北时力模具材料有限公司 | One-fire rolling method for Cr12MoV cold working die flat steel |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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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