CN101439348A - Technological process for producing super-thick plate - Google Patents
Technological process for producing super-thick plate Download PDFInfo
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- CN101439348A CN101439348A CNA2008102498177A CN200810249817A CN101439348A CN 101439348 A CN101439348 A CN 101439348A CN A2008102498177 A CNA2008102498177 A CN A2008102498177A CN 200810249817 A CN200810249817 A CN 200810249817A CN 101439348 A CN101439348 A CN 101439348A
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Abstract
The invention relates to a process for producing an ultra-thick plate and belongs to the field of rolling and producing an ultra-thick steel plate in the metallurgical industry. The invention mainly overcome the defect of producing the ultra-thick steel plate by a traditional model casting manufacturing blank and an electro-slag remelting manufacturing blank. The method comprises the following steps: cutting and fixing lengths of the blanks, mechanically conditioning the blanks (eliminating, leveling and cleaning a single-surface oxide layer of a casting blank with a milling machine, a planer or a shot blast); clamping an assembly (relatively superposing the cleaning surfaces of the two blanks after processing, placing the two blanks oppositely and clamping the blanks); mounting the blanks in a vacuum chamber of an electronic beam welding machine for purpose of vacuuming; sewing the assembly on the electronic beam welding seal edge, heating the assembly in a furnace and rolling the assembly through temperature control; and then producing the ultra-thick steel plate. Compared with the traditional electro-slag remelting production process, the process has the advantages of high production efficiency, reduced electric power consumption, less investment of production devices and low production cost. Compared with the traditional die casting production process, the process solves the problem of segregation and looseness of a large-scale die casting ingot center part; the finished product ratio is high; and the finished product ratio of blank assembly is over 90 %.
Description
Technical field:
The invention belongs to metallurgy industry Rolling Production super-thick steel plate field, the process that the steel billet that particularly can utilize present continuous casting process to produce is efficiently produced super-thick steel plate easily.
Background technology:
In the production of steel plate, usually be that steel plate more than the 80mm is called special heavy plate with thickness, super-thick steel plate is applied to the various aspects of the developments of the national economy such as heavy-duty machinery manufacturing, pressure vessel, boiler manufacturing, military project, marine drilling platform, nuclear power station, mould manufacturing, bridge, airport, traffic, be mainly high technology content, high value added product, have the very big market demand and wide application prospect.
In the production of steel plate, for satisfying the quality requirements such as intensity of sheet material, need with blank by certain compression ratio will be thicker billet rolling to desired thickness (improve density, intensity), produce super-thick steel plate and at first just need to solve the extra-thick plate blank that satisfies external form (thickness) requirement and quality requirement, but, the strand of continuous casting process production both at home and abroad can not satisfy the thickness requirement of rolling special heavy plate all at the following thickness of 300mm at present, can't be directly with its Rolling Production special heavy plate.So special heavy plate is produced required thick steel billet mainly by model casting base, the acquisition of electroslag remelting base, then through the Rolling Production super-thick steel plate at present.
Conventional model casting base production technology efficient is low, and the lumber recovery of blank is low, and lumber recovery is generally about 75%.In addition, because sectional dimension is big, and large-scale static ingot is the uneven object of chemical composition and physical property, especially heart portion mass defect is difficult to more greatly eliminate, it is very big that this meets the high-quality steel plate influence that flaw detection requires for production.
The electroslag remelting base is the method that the resistance heat that produces when utilizing electric current by slag carries out shaping blank melting again.Steel purity height, non-metallic inclusion through electroslag remelting is few, crystallization even compact, metallographic structure and chemical composition are even.But this production technology efficient is low, and specific yield is generally 1t/h during platform.Simultaneously, because be to melt once more and need a large amount of energy of secondary consumption casting good steel billet, electroslag remelting base per ton only power consumption approximately just needs more than the 1300KWh, and production cost is higher, and unit production capacity investment is big.
Summary of the invention:
The purpose of this invention is to provide a kind of process of producing special heavy plate, this method overcomes the shortcoming that conventional model casting base and electroslag remelting base exist, and high efficient and convenient is produced super-thick steel plate, can increase substantially lumber recovery, reduces cost, energy savings.
The technical scheme that technical solution problem of the present invention is taked is,
A kind of process of producing special heavy plate is characterized in that, comprises the steps: that the plate slab that will select for use is cut into needed briquet length, two or more than two briquet faying face is removed its surface oxide layer with Mechanical Method and reach smooth, cleaning; Briquet is stacked the base face that makes after the Surface Machining combine, align and coincide together,, send into centering in the vacuum electron beam welder vacuum chamber by being loaded on the chassis anchor clamps; Close vacuum chamber chamber door, vacuumize, vacuum degree control is at 1.0*10
-2～6*10
-2Pa; After meeting the requirements of vacuum, electron beam welding is carried out in briquet faying face surrounding, fusion penetration is controlled at 10-200mm: adjacent briquet faying face surrounding welding densification, airtight after welding is finished, and intermediate gaps forms vacuum; Open intake valve and charge into air, storehouse door opening transports the heavy slab after the seam; Heavy slab is sent into heating furnace by hot rolling technology and is heated to 1000-1300 ℃ after will welding, and is transported to heavy and medium plate mill again, and the control temperature is carried out composite rolling at 1300-850 ℃, and will make up the back heavy slab rolling is required thickness.
In technique scheme, described briquet is the steel billet that continuous casting process is produced.Perhaps,
Described briquet is electroslag remelting blank, orthodox casting blank, directional solidification blank or finished product steel plate sheet material.
In technique scheme, the heavy slab of described Combination Welding is to be combined into one by the steel plate briquet more than two, and two the relative faying faces of briquet that are positioned at the middle part all need Surface Machining.
In technique scheme, described billet surface Mechanical Method is handled and is comprised and utilize various planers, various milling machine or shot peening equipment to the removal of the oxide layer of blank surface, smooth, cleaning.
The invention has the beneficial effects as follows:
1, this process by the high-quality that utilizes existing continuous casting process to produce, low-cost continuous casting billet as raw material, behind mechanical finishing, adopt vacuum electron beam composite welding casting technology (two-layer or multilayer) combination, fundamentally solved the little restriction that can't produce special heavy plate of monolithic thickness of strand, for providing blank in the production that guarantees special heavy plate under certain compression ratio.Can utilize existing heavy and medium plate mill under suitable temperature of control and roll-force, to roll out super-thick steel plate, for the production of special heavy plate provides a kind of new process.Briquet of the present invention also can be electroslag remelting blank, orthodox casting blank, directional solidification blank or finished product steel plate sheet material.
2, this process is than traditional electroslag remelting production technology productive rate height, and power consumption reduces in a large number, and investment of production equipment is less, and production cost is low.Compare with the conventional die castings production technology, solved large-scale ingot casting heart portion's segregation and loose problem limitation; The lumber recovery height, blank combination lumber recovery is more than 90%.
The specific embodiment
Embodiment one: utilize common continuous casting billet to produce 100mm super-thick steel plate (100mm*2500mm*10000mm), material: Q235B.
The continuous casting billet scale is cut into: two boards base size is 270mm*2100mm*2400mm; Adopt planer-type milling machine respectively with two a compact material lists smooth and cleaning of plane processing, remove oxide layer (also available planer or shot-peening are removed); With the relative superimposition of two compact material machined surfaces together, by being loaded on the chassis anchor clamps (can keep flat or erect align clamping), send in the vacuum electron beam welder vacuum chamber; Close chamber's door behind the centering; Be evacuated down to 3*10
-2Pa carries out electron beam welding to briquet faying face surrounding, fusion penetration 50mm; Adjacent briquet faying face surrounding welding densification, airtight after welding is finished, intermediate gaps forms vacuum; Open intake valve and charge into air, storehouse door opening transports the heavy slab after the seam; The welding back combination base heating furnace of packing into is heated to 1200 ℃ of insulation 2h; High-pressure water descaling after coming out of the stove; Heavy and medium plate mill transverse rolling broadening is to required width; The control temperature divides the passage axial rolling to required thickness 100mm, overall compression ratio 5.4 at 850-1180 ℃ of composite rolling; The cutting scale is after the finishing: 100mm*2500mm*10000mm, warehouse-in after the assay was approved.Other technology that does not describe in detail is same as the prior art.
For by the steel plate briquet assembly more than two, two the relative faying faces of briquet that are positioned at the middle part all need Surface Machining, and each superimposed adjacent faying face welds equally.In addition identical with two block plate briquet assembly technologies.
Embodiment two: adopt the electroslag remelting slab, production high-quality special heavy plate (120mm*2500mm*10000mm), material H13.
Adopt high-quality electroslag remelting slab, two boards base size is 210mm*1900mm*4000mm; Adopt metal-planing machine respectively with two a compact material lists smooth and cleaning of plane processing, remove oxide layer; The relative superimposition of two compact material machined surfaces together by being loaded on the chassis anchor clamps (can keep flat or erect align clamping), is sent into the vacuum electron beam welder vacuum chamber, close chamber's door behind the centering; Be evacuated down to 6*10
-2Pa carries out electron beam welding to briquet faying face surrounding, fusion penetration 37mm; Adjacent briquet faying face surrounding welding densification, airtight after welding is finished, intermediate gaps forms vacuum; Open intake valve and charge into air, storehouse door opening transports the heavy slab after the seam; The welding back combination base heating furnace of packing into is heated to 1250 ℃ of insulation 4h; High-pressure water descaling after coming out of the stove; Milling train transverse rolling broadening is to required width; The control temperature divides the passage axial rolling to required thickness (120mm), overall compression ratio 3.5 at 900-1200 ℃ of composite rolling; The cutting scale is after the finishing: 120mm*2500mm*10000mm, warehouse-in is up to the standards.Other technology that does not describe in detail is same as the prior art.
For by the electroslag remelting slab assembly more than two, two the relative faying faces of briquet that are positioned at the middle part all need Surface Machining, and each superimposed adjacent faying face welds equally.In addition identical with two electroslag remelting slab assembly technologies.
The foregoing description finished product sample through metallographic, flaw detection, every ruggedness test, is all reached with the requirement of label plate property, and binding site combines together fully.
Claims (4)
1, a kind of process of producing special heavy plate is characterized in that, comprises the steps: that the plate slab that will select for use is cut into needed briquet length, two or more than two briquet faying face is removed its surface oxide layer with Mechanical Method and reach smooth, cleaning; Briquet is stacked the base face that makes after the Surface Machining combine, align and coincide together,, send into centering in the vacuum electron beam welder vacuum chamber by being loaded on the chassis anchor clamps; Close vacuum chamber chamber door, vacuumize, vacuum degree control is at 1.0*10
-2～6*10
-2Pa; After meeting the requirements of vacuum, electron beam welding is carried out in briquet faying face surrounding, fusion penetration is controlled at 10-200mm; Adjacent briquet faying face surrounding welding densification, airtight after welding is finished, intermediate gaps forms vacuum; Open intake valve and charge into air, storehouse door opening transports the heavy slab after the seam; Heavy slab is sent into heating furnace by hot rolling technology and is heated to 1000-1300 ℃ after will welding, and is transported to heavy and medium plate mill again, and the control temperature is carried out composite rolling at 1300-850 ℃, and will make up the back heavy slab rolling is required thickness.
2 a kind of processes of producing special heavy plate according to claim 1 is characterized in that described briquet is the steel billet that continuous casting process is produced.
3, a kind of process of producing special heavy plate according to claim 1 is characterized in that, described briquet is electroslag remelting blank, orthodox casting blank, directional solidification blank or finished product steel plate sheet material.
4, according to claim 1 or 2 or 3 described a kind of processes of producing special heavy plate, it is characterized in that, the heavy slab of described Combination Welding is to be combined into one by the steel plate briquet more than two, and two the relative faying faces of briquet that are positioned at the middle part all need Surface Machining.
5, a kind of process of producing special heavy plate according to claim 1, it is characterized in that described billet surface Mechanical Method is handled and comprised and utilize various planers, various milling machine or shot peening equipment to the removal of the oxide layer of blank surface, smooth, cleaning.
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| CNA2008102498177A CN101439348A (en) | 2008-12-29 | 2008-12-29 | Technological process for producing super-thick plate |
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|---|---|---|---|
| CNA2008102498177A CN101439348A (en) | 2008-12-29 | 2008-12-29 | Technological process for producing super-thick plate |
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| CN102489863A (en) * | 2011-12-26 | 2012-06-13 | 东北大学 | Vacuum welding mechanism for preparing extra-thick compound steel plate |
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| CN109128691A (en) * | 2018-10-26 | 2019-01-04 | 山东钢铁集团日照有限公司 | A kind of preparation process of the compound slab of high-carbon high-alloy steel plate |
| CN109773360A (en) * | 2018-11-28 | 2019-05-21 | 青岛海青汽车股份有限公司 | A kind of counterweight technique of high-altitude operation vehicle |
| CN114029706A (en) * | 2021-11-16 | 2022-02-11 | 山东钢铁集团日照有限公司 | Method for improving composite qualification rate of high-strength super-thick steel plate produced by vacuum pack rolling |
| CN114029706B (en) * | 2021-11-16 | 2023-10-31 | 山东钢铁集团日照有限公司 | Method for improving composite qualification rate of high-strength super-thick steel plate produced by vacuum tandem rolling |
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