CN101333629B - Method for producing medium-high-carbon high-strength steel based on sheet bar technology - Google Patents
Method for producing medium-high-carbon high-strength steel based on sheet bar technology Download PDFInfo
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Abstract
The invention relates to a production method of high-carbon and high-strength steel based on a thin slab process. The method adopts the technical proposal that: the steel is made by steelmaking, refining process, slab continuous casting, heating, soaking, hot continuous rolling, cooling and coiling. Wherein: the thickness of a thin slab ranges from 50 to 90mm, a continuous casting billet has a drawing speed of 2.5 to 6.0m/min, a heating furnace has a temperature of between 900 and 1100DEG C, a soaking pit has a temperature of between 1000 and 1250DEG C, the initial rolling temperature is between 1000 and 1200DEG C, the finishing temperature is between 650 and 950DEG C, the coiling temperature is between 450 and 850DEG C, and the thickness of a steel plate ranges from 1 too 12mm. The high-carbon and high-strength steel comprises the chemical constituents: 0.25 to 1.25 wt percent of carbon content, 0.001 to 0.1wt percent of Al, 0.0010 to 0.0050 wt percent of Ca, balance Fe, unavoidable impurities and one or more than one of alloying elements. The production method has advantages of good product quality, low production cost, low energy consumption and simple technical process.
Description
Technical field
The invention belongs to the continuous casting and rolling technique of sheet bar technical field.Be specifically related to a kind of production method of the medium high carbon high-strength steel based on sheet bar process.
Background technology
Tradition sheet billet continuous casting, sheet blank continuous casting technology are the main modes of producing steel sheet and strip steel plate, and ingot casting roughing cogging production technique is eliminated except that the production of only a few high quality steel.CSP and traditional sheet billet continuous casting and sheet blank continuous casting have unrivaled superiority in construction investment with on the production cycle, come out certainly, have been subjected to the close attention of various countries' iron and steel circle.
Why thin plate blank continuously casting and continuously rolling technology has so rapidly development in the time of more than ten years, just be it compare with traditional hot rolled strip production have that flow process is short, operation is compact, equipment is simple, reduced investment, energy consumption is low, environmental pollution is little, productivity is high and low cost and other advantages.The production of tradition hot rolled strip generally is the steelshop smelting molten steel, casts the heavy slab of certain specification length, is sent to mill after the cooling, and reheat is carried out to rolling the becoming a useful person of rolling temperature ability by process furnace in treated, marshalling back.Steelshop and mill are two relatively independent workshops, production line is discontinuous, and CSP is that continuous caster and continuous mill are linked to be a production line, molten steel is cast the thin slab of certain specification length by thinslab casting, enter online reheating furnace immediately and heat on a small quantity, send into promptly that continuous mill is rolling becomes a useful person.
Medium and high carbon steel is owing to easily cause component segregation even loose and shrinkage cavity, the fragility of high carbon steel in addition, and hot rolling or conventional heavy slab continuous casting+hot rolled technology are produced again to adopt die casting+breaking down cogging usually.For die casting+breaking down cogging hot rolling technology again, the energy consumption height, poor product quality, the production cycle is long, and recovery rate of iron is low, contaminate environment is serious, for conventional heavy slab continuous casting+hot rolled technology, cause the component segregation of carbon and performance inhomogeneous easily, energy consumption is higher, production cycle is longer, and recovery rate of iron is not high.
Summary of the invention
The purpose of this invention is to provide a kind of good product quality, production cost is low, energy consumption is low, with short production cycle, technological process is simply based on the production method of the medium high carbon high-strength steel of sheet bar process.Steel sheet intensity height, inside and surface quality height, the description of being produced are many.
For achieving the above object, the technical solution adopted in the present invention is: at the chemical ingredients and the sheet continuous casting and rolling process characteristic of this steel grade, make steel earlier and refinery practice, carry out sheet blank continuous casting again, directly enter roller hearth type heating furnace and soaking pit behind the casting blank solidification, carry out hot continuous rolling then, cool off and batch.Wherein: thin slab thickness is 50～90mm, the pulling rate of sheet blank continuous casting is 2.5～6.0m/min, the temperature that strand enters process furnace is 900～1100 ℃, the temperature that strand enters soaking pit is 1000～1250 ℃, the start rolling temperature of hot continuous rolling is 1000～1200 ℃, and finishing temperature is 650～950 ℃, after finish to gauge is finished or carry out laminar flow cooling or carry out air cooling, coiling temperature is 450～850 ℃, and control steel plate thickness is 1～12mm.
The chemical ingredients of described steel grade is: carbon content is that 0.25～1.25wt%, Al are that 0.001～0.1wt%, Ca are that 0.0010～0.0050wt%, Si are that 0.05～1.5wt%, Mn are 0.1～2.0wt%, and all the other are Fe, alloying element and unavoidable impurities; Alloying element and content thereof are: Ni is that 0.1～1.5wt%, Cr are that 0.1～1.5wt%, Mo are that 0.01～1.5wt%, V are that 0.01～1.5wt%, W are that 0.01～1.5wt%, Cu are that 0.01～1.5wt%, Ti are one or more the element among 0.01～0.15wt%.
Owing to adopt technique scheme, the present invention:
1) shortens production line length, reduced total area of pictural surface.CSP has shortened from the distance of crystallizer between the tropical reeling machine, has saved simultaneously that slab in traditional hot rolled strip production is deposited, treatment plant.
2) shortened the production cycle.Continuous casting and rolling is a successive process, has saved a large amount of middle residence times, by molten steel to rolling generally at 15～30 minutes, and traditional mode of production needs 5 hours at least.
3) reduce equipment, saved energy consumption.The thin slab thinner thickness causes the breaking down unit that can save in the production of tradition band steel.Strand is by direct rolling the becoming a useful person of finishing train.In addition, strand is under the condition of high temperature, and only a small amount of heating of need can be rolling, saved the energy.According to statistics, it is about 30% that CSP can be saved equipment, and power and energy consumption save 50%.
4) product cost reduces, and economic benefit is huge.With regard to investment, the investment of big section steel works from the heavy slab continuous casting to mill product is 875 dollars/t, and annual production can reach 4,000,000 tons, and the investment of a CSP is 200 dollars/t, and annual output is 2,500,000 tons.From work efficiency, the work efficiency of big section steel works is 1.5～2.5h/t, and CSP is 0.3～0.6h/t.To final rolling energy consumption, big section steel works is 465kWh/t from ladle furnace, and CSP is 105kWh/t.According to measuring and calculating, adopt CSP technology 90～100 dollars/t that will reduce cost.
5) improved recovery rate of iron, common continuous casting is 94.6%, and the recovery rate of iron of sheet blank continuous casting is 97.0%, and recovery rate of iron is significantly improved.
6) the thin slab surface does not need cleaning.In realizing the direct heat roll process; do not allow casting billet surface is cleared up; therefore; when sheet blank continuous casting; adopt specially for producing the good covering slag of fusing point low flow that thin slab is developed; can make to obtain good lubricatedly between the strand syncrystallization device, adopt the automatic control of molten steel face in the crystallizer, avoid the molten steel ground roll moving too big and cause volume slag and casting billet surface defective to occur.
7) the thin slab internal soundness is good.Because much larger than traditional heavy slab, its secondary dendrite and three dendrite are shorter in crystallizer internal cooling intensity for thin slab, column crystal is thinner, more even, for condition has been created in the refinement of final tissue.Simultaneously, because of cooling intensity is big, the microsegregation of slab has obtained very big improvement, is more evenly distributed, and the performance of product is more all even stable.
8) reduce pollution, protected environment.
9) carbon segregation in the medium and high carbon steel has obtained very big improvement, is more evenly distributed, and the performance of product is more all even stable.
10), can take laminar flow cooling or air cooling according to the performance requriements of medium and high carbon steel intensity etc.
11) according to the requirement of medium and high carbon steel description, can be in same stove or same kind of watering time rolling a plurality of different thickness, the production handiness is big.
12) because strand is thin, be easy to the medium high carbon steel plate of rolling thin specification.
The medium and high carbon steel steel sheet ferrite crystal grain that the present invention produced is tiny, and pearlite interlaminar spacing is little, the medium and high carbon steel steel sheet that its intensity and toughness are produced apparently higher than conventional process flow.Such steel clock is through after the modified thermal treatment, and its intensity and toughness exceed the steel grade that traditional technology is produced.
In a word, the continuous casting and rolling technique of sheet bar that the present invention adopts, because speed of cooling is fast, the component segregation of carbon and alloying element is little, tissue and performance are even.Steel sheet intensity height, inside and surface quality height, the description of being produced are many, and the production handiness is big, and recovery rate of iron obviously improves.Have good product quality, production cost is low, energy consumption is low, with short production cycle, characteristic of simple process.
The present invention is applicable to the production of all kinds of medium high carbon high-strength steel, as instrument steel and structure iron etc. such as saw blade steel, die steel, automobile door locks; Can improve the quality of products, enhance productivity, reduce production cost, economize on resources and the energy etc.
Description of drawings
Fig. 1 rolls the electron scanning micrograph of attitude for the 65Mn steel that the present invention produced;
The 65Mn steel that Fig. 2 produces for traditional technology rolls the electron scanning micrograph of attitude;
Fig. 3 rolls the transmission electron microscope photo of attitude for the 65Mn steel that the present invention produced;
The 65Mn steel that Fig. 4 produces for traditional technology rolls the transmission electron microscope photo of attitude;
Fig. 5 is optical microstructure's photo of the 30CrMo steel that the present invention produced;
Fig. 6 produces optical microstructure's photo of 30CrMo steel for traditional technology.
Embodiment
Below in conjunction with embodiment, the present invention is further described, be not limiting the scope of the invention.
Embodiment 1
A kind of production method of the medium high carbon high-strength steel based on sheet bar process.Chemical ingredients and sheet continuous casting and rolling process characteristic at this steel grade, adopt converter that molten iron smelting is become molten steel, after converter steelmaking, molten steel is carried out refining, add reductor Al and alloying element Si, Mn, carry out deoxidation and alloying, Al is controlled at 0.010%～0.040wt%.[Ca]/[Al] is than being controlled between 0.05～0.18.Molten steel carries out sheet blank continuous casting through after the refining, and thin slab thickness is 70mm, and continuous casting adopts the high carbon steel covering slag.Directly enter roller hearth type heating furnace and soaking pit behind the casting blank solidification, carry out hot continuous rolling then, cool off and batch.Wherein: continuous-cast blank thickness is 70mm, continuously cast bloom pulling rate 2.5～3.5m/min, the temperature that strand enters process furnace is 1000～1100 ℃, the temperature that strand enters soaking pit is 1000～1100 ℃, the start rolling temperature of hot continuous rolling is 1000～1050 ℃, and 650～680 ℃ of finishing temperatures are rolled into the steel plate of thickness 2.8mm at last, carry out the laminar flow cooling after finish to gauge is finished, the coiling temperature of steel plate is 600～700 ℃.
The chemical ingredients and the content thereof of described steel grade are: C is that 0.62～0.69wt%, Si are that 0.17～0.37wt%, Mn are that 0.7～1.0wt%, Al are that 0.01～0.04wt%, Ca are 0.0010～0.0030wt%, and all the other are Fe and unavoidable impurities.
The high carbon steel 65Mn that present embodiment 1 is produced rolls in the attitude tissue, through the observation of scanning electronic microscope and transmission electron microscope as shown in figures 1 and 3, mainly be perlite and ferritic structure, pearlitic sheet interlayer spacing is 0.1～0.5 μ m, and ferrite crystal grain is between 1～2 μ m; The 65Mn steel that traditional technology is produced rolls in the attitude tissue, and as Fig. 2 and shown in Figure 4, though also mainly be perlite and ferritic structure, pearlite interlaminar spacing is between 0.5～2.5 μ m, and ferrite crystal grain is between 2～5 μ m.
After testing, the tensile strength of the high carbon steel 65Mn steel plate that present embodiment 1 is produced is that 880MPa, yield strength are 490MPa, and yield tensile ratio is 0.56, and unit elongation can reach 18%; And the tensile strength of the high carbon steel 65Mn steel plate that traditional technology is produced is 650MPa, and unit elongation is about 8%.High carbon steel 65Mn steel plate that present embodiment 1 is produced is through after the modified thermal treatment, and its intensity and toughness are higher than 10～30% of identical steel grade that traditional technology produces.
Embodiment 2
A kind of production method of the medium high carbon high-strength steel based on sheet bar process.Chemical ingredients and sheet continuous casting and rolling process characteristic at this steel grade carry out refining to molten steel after converter steelmaking, add reductor Al and alloying element Si, Mn, Cr, Mo, carry out deoxidation and alloying, and Al is controlled at 0.010%～0.040%.[Ca]/[Al] is than being controlled between 0.05～0.18.Molten steel carries out sheet blank continuous casting through after the refining, and thin slab thickness is 90mm, and continuous casting adopts the medium carbon steel covering slag.Directly enter roller hearth type heating furnace and soaking pit behind the casting blank solidification, carry out hot continuous rolling then, cool off and batch.Wherein: the continuous-cast blank thickness of slab is 90mm, the pulling rate of sheet blank continuous casting is 3.5～4.5m/min, the temperature that strand enters process furnace is 1020～1100 ℃, the temperature that strand enters soaking pit is 1100～1250 ℃, the start rolling temperature of hot continuous rolling is 1050～1200 ℃, and finishing temperature is 700～950 ℃, and finish to gauge is finished laggard line space air cooling but, coiling temperature is 680～850 ℃, and control steel plate thickness is 3.5mm.
The chemical ingredients of described steel grade is: C is that 0.26～0.33wt%, Si are that 0.17～0.375wt%, Mn are that 0.4～0.7wt%, Cr are that 0.8～1.1wt%, Mo are that 0.15～0.25wt%, Al are that 0.01～0.04%wt, Ca are 0.0010～0.0030%wt, and all the other are Fe and unavoidable impurities.
The high carbon steel 30CrMo that present embodiment 2 is produced rolls in the attitude tissue, through opticmicroscope observation as shown in Figure 5, mainly is perlite and ferritic structure, and pearlite interlaminar spacing is at 0.1～0.5 μ m, and ferrite crystal grain is between 2～5 μ m; The 30CrMo steel that traditional technology is produced rolls in the attitude tissue, and through opticmicroscope observation as shown in Figure 6, figure Medium pearlite sheet interlayer spacing is bigger, is generally 0.5～2.5 μ m, and ferrite crystal grain is between 20～30 μ m.
The tensile strength of the 30CrMo steel plate that present embodiment 2 is produced is 680MPa, and yield strength is 460MPa, and yield tensile ratio is 0.68; And the tensile strength of the 30CrMo steel plate that traditional technology is produced has only 530MPa, and yield strength is 320MPa, and yield tensile ratio is 0.62.Compare with traditional technology, the yield strength of the 30CrMo steel plate that present embodiment 2 is produced raises more than 40%.The 30CrMo steel plate that present embodiment 2 is produced is through after the modified thermal treatment, and its intensity and toughness are apparently higher than the 30CrMo steel plate of traditional technology production.
A kind of production method of the medium high carbon high-strength steel based on sheet bar process.Chemical ingredients and sheet continuous casting and rolling process characteristic at this steel grade carry out refining to molten steel after converter steelmaking, add reductor Al and alloying element Si, Mn, Cu, W, carry out deoxidation and alloying, and Al is controlled at 0.010%～0.040wt%.[Ca]/[Al] is than being controlled between 0.05～0.18.Molten steel carries out sheet blank continuous casting through after the refining, and thin slab thickness is 50mm, and continuous casting adopts the medium carbon steel covering slag, directly enters roller hearth type heating furnace and soaking pit behind the casting blank solidification, carries out hot continuous rolling then, cools off and batches.Wherein: thin slab thickness is 50mm, the pulling rate of sheet blank continuous casting is 4.5～6.0m/min, the temperature that strand enters process furnace is 900～1020 ℃, the temperature that strand enters soaking pit is 1050～1150 ℃, the start rolling temperature of hot continuous rolling is 1000～1100 ℃, and finishing temperature is 650～750 ℃, after finish to gauge is finished or carry out laminar flow cooling, coiling temperature is 450～850 ℃, and control steel plate thickness is 11mm.
The chemical ingredients of described steel grade is: C is that 0.40～0.50wt%, Si are that 0.15～0.35wt%, Mn are that 0.1～0.4wt%, Cu are that 0.1～0.3wt%, W are that 0.01～0.2wt%, Al are that 0.01～0.04wt%, Ca are 0.0010～0.0030wt%, and all the other are Fe and unavoidable impurities.
The tensile strength of the steel plate that present embodiment 3 is produced is 640MPa, and yield strength is 410MPa.After the modified thermal treatment of this steel process, the identical steel grade that its intensity and toughness are produced apparently higher than traditional technology.
Embodiment 4
A kind of production method of the medium high carbon high-strength steel based on sheet bar process.Chemical ingredients and sheet continuous casting and rolling process characteristic at this steel grade carry out refining to molten steel after converter steelmaking, add reductor Al and alloying element Si, Mn, Ti, carry out deoxidation and alloying, and Al is controlled at 0.04%～0.08wt%.[Ca]/[Al] is than being controlled between 0.03～0.1.Molten steel carries out sheet blank continuous casting through after the refining, and thin slab thickness is 50mm, and continuous casting adopts the high carbon steel covering slag, directly enters roller hearth type heating furnace and soaking pit behind the casting blank solidification, carries out hot continuous rolling then, cools off and batches.Wherein: thin slab thickness is 50mm, the pulling rate of sheet blank continuous casting is 2.5～4.0m/min, the temperature that strand enters process furnace is 900～1020 ℃, the temperature that strand enters soaking pit is 1050～1150 ℃, the start rolling temperature of hot continuous rolling is 1000～1080 ℃, and finishing temperature is 620～720 ℃, after finish to gauge is finished or carry out laminar flow cooling, coiling temperature is 450～800 ℃, and control steel plate thickness is 7mm.
The chemical ingredients of described steel grade is: C is that 1.02～1.22wt%, Si are that 0.15～0.35wt%, Mn are that 0.1～0.4wt%, Ti are that 0.06～0.12wt%, Al are that 0.04～0.08wt%, Ca are 0.0010～0.0030wt%, and all the other are Fe and unavoidable impurities.
The yield strength of the steel plate that present embodiment 4 is produced is 1410MPa.This steel is through after the modified thermal treatment, and its intensity and toughness are apparently higher than the high-carbon steel grade of traditional technology production.
The medium and high carbon steel steel sheet ferrite crystal grain that present embodiment 1～4 is produced is tiny, and pearlite interlaminar spacing is little, the medium carbon steel steel sheet that its intensity and toughness are produced apparently higher than conventional process flow.Such steel clock is through after the modified thermal treatment, and its intensity and toughness height exceed the steel grade that traditional technology is produced.Thereby steel sheet intensity height, inside and surface quality height, the description of being produced are many, and the production handiness is big, and recovery rate of iron obviously improves.
This embodiment adopts continuous casting and rolling technique of sheet bar, because speed of cooling is fast, the component segregation of carbon and alloying element is little, and tissue and performance are even.Therefore, have good product quality, production cost is low, energy consumption is low, with short production cycle, characteristic of simple process.
This embodiment is used for the production of all kinds of medium high carbon high-strength steel, as instrument steel and structure iron etc. such as saw blade steel, die steel, automobile door locks; Can improve the quality of products, enhance productivity, reduce production cost, economize on resources and the energy etc.
Claims (2)
1. production method based on the medium high carbon high-strength steel of sheet bar process, it is characterized in that chemical ingredients and sheet continuous casting and rolling process characteristic at this steel grade, make steel earlier and refinery practice, carry out sheet blank continuous casting again, directly enter roller hearth type heating furnace and soaking pit behind the casting blank solidification, carry out hot continuous rolling then, cool off and batch; Wherein: thin slab thickness is 50～90mm, the pulling rate of sheet blank continuous casting is 2.5～6.0m/min, the temperature that strand enters process furnace is 900～1100 ℃, the temperature that strand enters soaking pit is 1000～1250 ℃, the start rolling temperature of hot continuous rolling is 1000～1200 ℃, and finishing temperature is 650～950 ℃, after finish to gauge is finished or carry out laminar flow cooling or carry out air cooling, coiling temperature is 450～850 ℃, and control steel plate thickness is 1～12mm; The chemical ingredients of described steel grade is: carbon content is that 0.25～1.25wt%, Al are that 0.001～0.1wt%, Ca are that 0.0010～0.0050wt%, Si are that 0.05～1.5wt%, Mn are 0.1～2.0wt%, and all the other are Fe and unavoidable impurities.
2. production method based on the medium high carbon high-strength steel of sheet bar process, it is characterized in that chemical ingredients and sheet continuous casting and rolling process characteristic at this steel grade, make steel earlier and refinery practice, carry out sheet blank continuous casting again, directly enter roller hearth type heating furnace and soaking pit behind the casting blank solidification, carry out hot continuous rolling then, cool off and batch; Wherein: thin slab thickness is 50～90mm, the pulling rate of sheet blank continuous casting is 2.5～6.0m/min, the temperature that strand enters process furnace is 900～1100 ℃, the temperature that strand enters soaking pit is 1000～1250 ℃, the start rolling temperature of hot continuous rolling is 1000～1200 ℃, and finishing temperature is 650～950 ℃, after finish to gauge is finished or carry out laminar flow cooling or carry out air cooling, coiling temperature is 450～850 ℃, and control steel plate thickness is 1～12mm; The chemical ingredients of described steel grade is: carbon content is that 0.25～1.25wt%, Al are that 0.001～0.1wt%, Ca are that 0.0010～0.0050wt%, Si are that 0.05～1.5wt%, Mn are 0.1～2.0wt%, all the other are Fe and unavoidable impurities, and also containing Ni is that 0.1～1.5wt%, Cr are that 0.1～1.5wt%, Mo are that 0.01～1.5wt%, V are that 0.01～1.5wt%, W are that 0.01～1.5wt%, Cu are that 0.01～1.5wt%, Ti are more than one elements among 0.01～0.15wt%.
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| CN101921897B (en) * | 2009-06-12 | 2013-12-11 | 鞍钢股份有限公司 | Method for reducing carbon segregation in high-carbon steel |
| CN105543630B (en) * | 2015-12-21 | 2017-08-25 | 秦皇岛首秦金属材料有限公司 | A kind of boracic high-carbon saw blade steel and its manufacture method |
| CN106544485B (en) * | 2016-11-08 | 2018-07-03 | 武汉钢铁有限公司 | The manufacturing method of thin slab continuous casting and rolling great surface quality medium and high carbon steel |
| CN109321729B (en) * | 2018-11-28 | 2020-01-24 | 武汉科技大学 | Rolling method of high-carbon steel |
| CN114686753B (en) * | 2022-04-20 | 2023-03-28 | 张家港宏昌钢板有限公司 | Method for producing 40Mn hot-rolled steel, and use thereof |
| CN115383063B (en) * | 2022-08-25 | 2024-01-26 | 湖南华菱涟源钢铁有限公司 | Production method of SK120 ultra-high carbon steel plate |
| CN115198063B (en) * | 2022-09-19 | 2022-12-09 | 苏州创镕新材料科技有限公司 | Method for reducing banded structure of medium-high carbon tool steel |
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