CN106521119A - High-carbon-equivalent continuous casting sheet billet stacking and slow-cooling method - Google Patents
High-carbon-equivalent continuous casting sheet billet stacking and slow-cooling method Download PDFInfo
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- CN106521119A CN106521119A CN201610871228.7A CN201610871228A CN106521119A CN 106521119 A CN106521119 A CN 106521119A CN 201610871228 A CN201610871228 A CN 201610871228A CN 106521119 A CN106521119 A CN 106521119A
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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
- C21D1/84—Controlled slow cooling
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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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
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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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
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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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
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- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
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- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Steel (AREA)
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- Continuous Casting (AREA)
Abstract
The invention relates to a high-carbon-equivalent continuous casting sheet billet stacking and slow-cooling method and belongs to the technical field of continuous casting sheet billets. The high-carbon-equivalent continuous casting sheet billet stacking and slow-cooling method comprises the specific steps and parameters that the surface temperature after high-carbon-equivalent sheet billets are discharged from a production line is 850-900 DEG C; the stack bottom, top and periphery of a high-carbon-equivalent sheet billet stack are fenced by hot billets, and the surface temperature of the hot billets on the stack bottom, top and periphery is 300-600 DEG C; the distance between a peripheral hot billet stack and the high-carbon-equivalent sheet billet stack is controlled to 1.5-2.0 m; the stacking height of the high-carbon-equivalent sheet billets is smaller than or equal to 2 m, the sum of the stacking heights of the high-carbon-equivalent sheet billets, the stack bottom hot billets and the stack top hot billets is smaller than or equal to 2.5 m, and the height of the peripheral hot billet stack is not smaller than the sum of the sum of the stacking heights of the high-carbon-equivalent sheet billets, the stack bottom hot billets and the stack top hot billets; and the stacking and slow-cooling time is 120-240 hours. After the slow-cooling time reaches 96 hours, the surface temperatures of the high-carbon-equivalent sheet billets and the surface temperature of the peripheral hot billets are measured and are below 300 DEG C for 48 hours continuously, and then unstacking is conducted. The method has the advantages that low-cost production is achieved, the sheet billet breaking risk is reduced, and the development requirements of high-carbon-equivalent sheet billet products are met.
Description
Technical field
The invention belongs to continuous casting steel billet technical field, more particularly to a kind of side of carbon equivalent high continuous casting steel billet stacking slow cooling
Method, is primarily adapted for use in steel grade of the carbon equivalent in 0.60-1.50%.
Background technology
Carbon equivalent high (high-carbon or high alloy) steel grade market is applied widely, such as plastic die steel, forging axle-steel etc..
Such steel grade carbon content is high, alloy content is more, and crack sensitivity is high, and production difficulty is big, and added value is also high, becomes current iron and steel enterprise
The focus areas of industry competition.Electric furnace steel making and molding cast are the traditional production procedures of this steel grade.In recent years, with iron and steel row
The depression of industry, pneumatic steelmaking and continuous casting enterprise also begin to produce as a trial carbon equivalent high steel grade with net income increase level, but due to
Majority does not have supporting steel billet slow cooling facility, and product quality is difficult to ensure that continuous casting steel billet fracture accident happens occasionally, have impact on product
Product development process.If newly-built steel billet burial pit facility, site condition are difficult to meet, travelling overhead crane apparatus are also required to corresponding replacing, work
Journey difficulty and required investment are all larger, and short-term is difficult to.In order to solve this problem, the present invention proposes a kind of continuous casting steel billet heap
The method of pile slow cooling, can stably realize carbon equivalent high continuous casting steel billet Slow cooling, effectively reduce bloom fracture risk, be conducive to
The low cost batch production of such steel grade.
The content of the invention
It is an object of the invention to provide a kind of method of carbon equivalent high continuous casting steel billet stacking slow cooling, solves without slow
The problem of carbon equivalent high continuous casting steel billet slow cooling is realized in the place of cold hole facility, is reduced bloom fracture risk, is met high-carbon
The exploitation of equivalent steel billet product is required.
Present invention is generally directed to carbon equivalent is 0.60～1.50% steel grade, steel grade carbon equivalent computing formula is adopted：Ceq
=C+Mn/6+ (Cr+Mo+V)/5+ (Ni+Cu)/15.
For solving above-mentioned technical problem, concrete steps and technological parameter are as follows：
1st, steel billet temperature：Surface temperature after carbon equivalent high steel billet is offline is 850～900 DEG C.
2nd, stacking：In the pile bottom of carbon equivalent high steel billet stacking, pile top and surrounding hot base enclosing, the hot base in pile bottom, pile top heat
The surface temperature of base and the hot base of surrounding is 300～600 DEG C；The distance controlling of the hot base stacking of surrounding and carbon equivalent high steel billet stacking
In 1.5m～2.0m；Stacking height≤the 2m of carbon equivalent high steel billet, carbon equivalent high steel billet, the stacking of the hot base of the hot base in pile bottom and pile top
Height summation≤2.5m, the hot base stacking height of surrounding are not less than carbon equivalent high steel billet, the heap height of embankment of the hot base of the hot base in pile bottom and pile top
Degree summation；Heap awkward silence at a meeting position avoids place air port and passageway position.
3rd, slow cooling：120～240h of stacking slow cooling time.After temperature retention time reaches 96h, carbon equivalent high steel billet and surrounding is measured
Surface temperature de-stacking below 300 DEG C of the surface temperature of hot base, continuous 48h carbon equivalent highs steel billet and the hot base of surrounding.
It is an advantage of the current invention that：
1st, realize effective Slow cooling of carbon equivalent steel grade continuous casting steel billet in the range of the 0.60-1.50%, it is to avoid steel billet
Fracture occurs.
2nd, the method can utilize existing tooling device and with plant area's interior-heat base resource, need not newly increase investment, realize high
The low cost production of carbon equivalent steel grade, improves enterprise competitiveness.
Specific embodiment
Embodiment 1
Certain steel mill carries out carbon equivalent high mould steel 738H smeltings, and process route is " converter smelting ladle furnace refining RH
Refine sheet billet continuous casting ", produce 6 stoves, chemical composition ranges be carbon content 0.36-0.38%, silicone content 0.25-0.35%, manganese
Content 1.40-1.50%, nickel content 1.10-1.30%, chromium content 1.85-1.95%, content of vanadium 0.098-0.115%, molybdenum contain
Amount 0.18-0.25%, and other elements such as residual phosphorus, sulfur, are computed, and carbon equivalent is 1.10-1.20%.
1st, steel billet temperature：Continuous casting steel billet specifications section is 400mm × 2000mm.The offline rear surface temperature of steel billet is 860-
890℃。
2nd, stacking：4 blocks of 738H carbon equivalent high steel billets are put per pile, in the pile bottom of carbon equivalent high steel billet stacking, pile top and surrounding
With hot base enclosing, the surface temperature of the hot base in pile bottom is 370 DEG C, and the surface temperature of the hot base of surrounding is 300～410 DEG C, the hot base in pile top
Surface temperature be 350 DEG C；The hot base stacking of surrounding is with carbon equivalent high steel billet stacking apart from 1.6m；The stacking of carbon equivalent high steel billet
Highly be 1.6m, carbon equivalent high steel billet, the hot base of the hot base in pile bottom and pile top stacking height summation be 2.2m, the stacking of the hot base of surrounding
Highly it is 2.5m；Heap awkward silence at a meeting position avoids place air port and passageway position.
3rd, slow cooling：The stacking slow cooling time is 120h.After slow cooling 96 hours, the surface temperature of carbon equivalent high steel billet is measured, the
Thermometric billet surface temperature is 270-290 DEG C within one day, and second day thermometric billet surface temperature 230-280 DEG C, de-stacking delivery, Jing are objective
Family is fed back, and steel billet service condition is good, and fracture does not occur.
Embodiment 2
Certain steel mill carries out carbon equivalent high forging axle 35CrMo and smelts, and process route is " converter smelting ladle furnace essence
Refining RH refine sheet billet continuous castings ", produce 5 stoves, chemical composition ranges be carbon content 0.34-0.36%, silicone content 0.20-
0.35%, manganese content 0.45-0.50%, chromium content 0.90-1.10%, molybdenum content 0.15-0.25%, and residual phosphorus, sulfur etc.
Other elements, are computed, and carbon equivalent is 0.65-0.70%.
1st, steel billet temperature：Continuous casting steel billet specifications section is 400mm × 2000mm, and the offline rear surface temperature of steel billet is 860-
900℃。
2nd, stacking：4 blocks of 35CrMo carbon equivalent high steel billets are put per pile, on the pile bottom of carbon equivalent high steel billet stacking, pile top and four
Use hot base enclosing week, the surface temperature of the hot base in pile bottom is 390 DEG C, the surface temperature of the hot base of surrounding is 330～450 DEG C, and pile top is hot
The surface temperature of base is 370 DEG C；The hot base stacking of surrounding is with carbon equivalent high steel billet stacking apart from 1.8m；The heap of carbon equivalent high steel billet
Height of embankment degree for 1.6m, the hot bottom base of carbon equivalent high steel billet, pile and the hot base in pile top stacking height summation be 2.4m, the heap of the hot base of surrounding
Height of embankment degree is 2.5m；Heap awkward silence at a meeting position avoids place air port and passageway position.
3rd, slow cooling：The stacking slow cooling time is 120h.After slow cooling 96 hours, the surface temperature of carbon equivalent high steel billet is measured, the
Thermometric billet surface temperature is 275-295 DEG C within one day, and second day thermometric billet surface temperature 230-265 DEG C, de-stacking delivery, Jing are objective
Family is fed back, and steel billet service condition is good, and fracture does not occur.
Claims (2)
1. a kind of method of carbon equivalent high continuous casting steel billet stacking slow cooling, it is characterised in that concrete steps and technological parameter are as follows：
1) steel billet temperature：Surface temperature after carbon equivalent high steel billet is offline is 850～900 DEG C；
2) stacking：In the pile bottom of carbon equivalent high steel billet stacking, pile top and surrounding with hot base enclosing, the hot base in pile bottom, the hot base in pile top and
The surface temperature of the hot base of surrounding is 300～600 DEG C；The hot base stacking of surrounding is existed with the distance controlling of carbon equivalent high steel billet stacking
1.5～2.0m；Stacking height≤the 2m of carbon equivalent high steel billet, carbon equivalent high steel billet, the heap height of embankment of the hot base of the hot base in pile bottom and pile top
Degree summation≤2.5m, the hot base stacking height of surrounding are not less than carbon equivalent high steel billet, the stacking height of the hot base of the hot base in pile bottom and pile top
Summation；Heap awkward silence at a meeting position avoids place air port and passageway position；
3) slow cooling：120～240h of stacking slow cooling time, after temperature retention time reaches 96h, measures carbon equivalent high steel billet and the hot base of surrounding
Surface temperature, surface temperature de-stacking below 300 DEG C of continuous 48h carbon equivalent highs steel billet and the hot base of surrounding.
2. method according to claim 1, it is characterised in that it is 0.60～1.50% that the method is applied to carbon equivalent scope
Steel grade, carbon equivalent calculated using formula Ceq=C+Mn/6+ (Cr+Mo+V)/5+ (Ni+Cu)/15.
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| CN201610871228.7A CN106521119B (en) | 2016-09-30 | 2016-09-30 | A kind of method of carbon equivalent high continuous casting steel billet stacking slow cooling |
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| CN201610871228.7A CN106521119B (en) | 2016-09-30 | 2016-09-30 | A kind of method of carbon equivalent high continuous casting steel billet stacking slow cooling |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111270042A (en) * | 2020-04-16 | 2020-06-12 | 贝斯山钢(山东)钢板有限公司 | Hydrogen induced crack control method for high-carbon equivalent steel |
Citations (4)
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| 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 |
| CN102909334A (en) * | 2012-11-16 | 2013-02-06 | 内蒙古包钢钢联股份有限公司 | Control method for cracks of continuous casting slabs of Cr-contained low alloy steel TDC76 |
| CN104328253A (en) * | 2014-10-08 | 2015-02-04 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Special thick plate stacking slow-cooling method |
| CN104561477A (en) * | 2015-01-04 | 2015-04-29 | 南京钢铁股份有限公司 | Steel plate stacking and slow-cooling method for improving flaw detection qualification rate of medium plates |
-
2016
- 2016-09-30 CN CN201610871228.7A patent/CN106521119B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN102909334A (en) * | 2012-11-16 | 2013-02-06 | 内蒙古包钢钢联股份有限公司 | Control method for cracks of continuous casting slabs of Cr-contained low alloy steel TDC76 |
| CN104328253A (en) * | 2014-10-08 | 2015-02-04 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Special thick plate stacking slow-cooling method |
| CN104561477A (en) * | 2015-01-04 | 2015-04-29 | 南京钢铁股份有限公司 | Steel plate stacking and slow-cooling method for improving flaw detection qualification rate of medium plates |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111270042A (en) * | 2020-04-16 | 2020-06-12 | 贝斯山钢(山东)钢板有限公司 | Hydrogen induced crack control method for high-carbon equivalent steel |
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| CN106521119B (en) | 2018-08-10 |
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Effective date of registration: 20190430 Address after: 063200 Iron and Steel Power Park, Caofeidian Industrial Zone, Tangshan City, Hebei Province Patentee after: Shougang Jingtang Steel & Iron United Co., Ltd. Address before: 066326 Duzhuang, Haigang District, Qinhuangdao City, Hebei Province Patentee before: Qinhuangdao Shouqin Metal Material Co., Ltd. |
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