CN101798656B - Method for producing 50CrV4 hot-rolled sheets - Google Patents
Method for producing 50CrV4 hot-rolled sheets Download PDFInfo
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- CN101798656B CN101798656B CN2010100195336A CN201010019533A CN101798656B CN 101798656 B CN101798656 B CN 101798656B CN 2010100195336 A CN2010100195336 A CN 2010100195336A CN 201010019533 A CN201010019533 A CN 201010019533A CN 101798656 B CN101798656 B CN 101798656B
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Abstract
The invention discloses a method for producing 50CrV4 hot-rolled steel sheets. The method is based on a thin-slab continuous-casting continuous-rolling process, and comprises the processes of smelting, refining, thin-slab continuous casting, soaking, high-pressure water descaling, hot continuous rolling, laminar cooling and coiling, wherein the drawing speed S of continuous casting is more than or equal to 3.5m/min and less than or equal to 5.5m/min; the charging temperature T of casting blanks is more than or equal to 900 DEG C and less than or equal to 1,050 DEG C; the temperature T of finish rolling is more than or equal to 850 DEG C and less than or equal to 950 DEG C; the temperature T of coiling is more than or equal to 550 DEG C and less than or equal to 650 DEG C; the superheat temperature T of molten steel is more then 30 DEG C and less than or equal to 45 DEG C; and the depressing length L of casting-blank liquid cores is more than or equal to 2mm and less than or equal to 20mm. The refined molten steel comprises the following chemical components in percentage by weight: 0.47 to 0.55 percent of C, less than or equal to 0.40 percent of Si, 0.70 to 1.10 percent of Mn, less than or equal to 0.025 percent of P, less than or equal to 0.025 percent of S, 0.90 to 1.20 percent of Cr, 0.10 to 0.25 percent of V, and the balance of Fe and inevitable impurities. The 50CrV4 hot-rolled steel sheets prepared by the method have the characteristics of uniform structure performance and high thermal stability, so the method obviously improves the quality of the 50CrV4 hot-rolled steel sheets.
Description
Technical field
The present invention relates to the structural alloy steel production technical field, particularly a kind of production method of 50CrV4 SPHC.
Background technology
The 50CrV4 structural alloy steel have quenching degree good, be difficult for advantages such as decarburization, surface quality are good, this structural alloy steel is the indispensable product of heavy-duty car industry.With silicomanganese is that structural alloy steel is compared, 50CrV4 adds V simultaneously and makes grain refinement because the adding of Cr makes that the quenching degree of steel is better, guarantee at high temperature still to have higher elastic limit and yield limit, and have advantages such as the decarburization of being difficult for, surface quality are good.
Usually the 50CrV4 hot rolled steel plate adopts traditional process production, have following subject matter: owing to 50CrV4 carbon content height, alloying component complexity, heavy slab conticaster pulling rate is low simultaneously, and molten steel solidification is slow, cause strand component segregation and loose easily, cause the inhomogeneous of final products structure property; Adopt walking beam furnace heating strand, heat time heating time is long, temperature is high, and the casting billet surface decarburization is serious, directly influences case hardness, wearability and the heat endurance of product; The setting temperature of 50CrV4 is low, and simultaneously the traditional process casting speed is slow, causes the strand temperature low, enters the cold plasticity district, cracks in the surface and the limit portion of strand, directly influences product quality.
CSP is a new technology of preparing of producing SPHC, it with traditional continuous casting, heating, hot continuous rolling etc. independently operation organically integrate, have with short production cycle, advantages such as energy consumption is low, reduced investment.In recent ten years, this technology in the world particularly China applied rapidly, existing at present 13 production lines come into operation, total production capacity reaches 3,500 ten thousand tons/year.CSP has become a kind of important technological process of production of SPHC, and product mainly is based on all kinds of steel grades of low-carbon (LC), and medium and high carbon steel, particularly field of alloy steel rarely have and relate to.Hunan Hualing Lianyuan Iron And Steel Co., Ltd has carried out the related work of medium and high carbon steel based on sheet billet continuous casting and rolling production line, 200810048357.1) and " a kind of based on sheet bar process contain Nb medium high carbon high strength steel and manufacture method thereof " (application number: two patents 200810048358.6) " a kind of production method of the medium high carbon high strength steel based on sheet bar process " (application number: has been proposed, but described application has just been done a wide in range summary to the method for producing the medium high carbon high-strength steel based on bar strip continuous casting and rolling flow path, its described parameter area, it is the parameter area of the most basic selection of all bar strip continuous casting and rolling flow path, all steel grades all be according to this most widely scope formulate concrete production technology, and at different steel grades, every kind of concrete production technology all needs those skilled in the art just can draw through a large amount of experiment and creative works.Above-mentioned patent has proposed to produce based on bar strip continuous casting and rolling flow path the method for medium high carbon high-strength steel, but do not mention technology and method that structural alloy steel is concrete, do not mention simultaneously the concrete solution of the key technical problem that the structural alloy steel production process exists yet, particularly do not mention the technology of preparing and the method for 50CrV4 hot rolled steel plate.
Summary of the invention
The objective of the invention is to overcome the defective of prior art, a kind of production method of 50CrV4 SPHC is provided, the 50CrV4 hot rolled steel plate that adopts the method for the invention to produce has the advantages that structure property is even, heat endurance is high, has significantly improved the quality of 50CrV4 hot rolled steel plate.
Its technical scheme is as follows:
A kind of production method of 50CrV4 SPHC, this method comprises: smelting, refining, sheet blank continuous casting, soaking, high-pressure water descaling, hot continuous rolling, laminar flow cooling, coiling technique process,
Wherein, the chemical composition of molten steel is C 0.47～0.55wt% after the refining, Si≤0.40wt%, Mn 0.70～1.10wt%, P≤0.025wt%, S≤0.025wt%, Cr 0.90～1.20wt%, V 0.10～0.25wt%, all the other are Fe and unavoidable impurities;
The bar strip continuous casting and rolling flow path technological parameter is: continuous casting pulling rate S
DrawBe 3.5m/min≤S
Draw≤ 5.5m/min, strand charging temperature T
Go intoBe 900 ℃≤T
Go into≤ 1050 ℃, finishing temperature T
EventuallyBe 850 ℃≤T
Eventually≤ 950 ℃, coiling temperature T
VolumeBe 550 ℃≤T
Volume≤ 650 ℃; Molten steel overheat T
CrossBe 30 ℃＜T
Cross≤ 45 ℃, strand liquid core is depressed L
PressBe 2≤L
Press≤ 20mm.
The cast of employing covering slag, the physical and chemical index of described covering slag: fusion point is 997 ± 50 ℃, and basicity is 0.92 ± 0.1, and viscosity is 1300 ℃, 0.95 ± 0.5 pool, bulk density is 0.60 ± 0.2Kg/L.
Preferably, the chemical composition of molten steel is after the refining: C 0.50～0.53wt%, Si 0.20～0.30wt%, Mn 0.80～1.00wt%, P≤0.015wt%, S≤0.015wt%, Cr 0.90～1.00wt%, V 0.10～0.15wt%, all the other are Fe and unavoidable impurities.Preferably, strand liquid core is depressed L
PressBe 5mm≤L
Press≤ 15mm.
Preferably, molten steel overheat T
CrossBe 35 ℃≤T
Cross≤ 45 ℃, strand charging temperature T
Go intoBe 950 ℃≤T
Go into≤ 1050 ℃, the steel plate decarburized layer deepness is less than 0.3～1.0% of steel plate thickness.More preferably, molten steel overheat T
CrossBe 40 ℃≤T
Cross≤ 45 ℃, strand charging temperature T
Go intoBe 1000 ℃≤T
Go into≤ 1050 ℃, the steel plate decarburized layer deepness is less than 0.3～0.8% of steel plate thickness.
Preferably, coiling temperature T
VolumeBe 580 ℃≤T
Volume≤ 620 ℃.
The present invention obtains high-quality 50CrV4 SPHC by optimizing the processing parameter of 50CrV4 SPHC, and particularly, the present invention has following advantage:
1. break through traditional technological limit, continuous casting adopts high molten steel overheat.For guaranteeing slab quality, adopt low overheat cast (degree of superheat is 15～30 ℃) usually.But (liquidus temperature is about 1482 ℃ because the 50CrV4 liquidus temperature is low, liquidus temperature than mild steel commonly used hangs down about 50 ℃), as adopt existing low overheat placing, to cause the strand temperature low, bending section at continuous casting, strand enters the cold plasticity district, causes casting billet surface and limit portion crackle, has a strong impact on the quality of final products.For this reason, break through traditional technological limit, adopt the cast of high molten steel overheat, the degree of superheat is brought up to 30～45 ℃ from 15～30 ℃, significantly improved slab quality.Molten steel overheat is high more, and the strand charging temperature is high more, and the time that strand stops in heating furnace is short more, and decarburized layer is then thin more, and plate quality is good more.
2. adopt the liquid core to depress technology 2≤L
Press≤ 20mm improves the uniformity of continuous casting billet structure, thereby improves the uniformity of the structure property of final products.In the casting blank solidification process, adopt the liquid core to depress technology, reduced defectives such as segregation, loose and underbead crack, improved slab quality, lay a good foundation for obtaining high-quality final hot rolled steel plate.
3. adopt special-purpose covering slag.Sheet blank continuous casting pulling rate height, cooling velocity are fast; steel alloy carbon content height, alloying component complexity; for guaranteeing that casting process carries out smoothly; guarantee slab quality simultaneously; developed the covering slag of the special use that is applicable to bar strip continuous casting and rolling flow path production steel alloy; break through the mentality of designing of traditional process continuous casting covering slag, had the advantage of eutectic melting point, low basicity, moderate viscosity and low bulk density.Cast curve when adopting common covering slag to pour into a mould medium and high carbon steel; wide hot-fluid of casting process crystallizer progressively descends, and the leptoprosopy hot-fluid rises, along with connecting the increase of watering the stove number; the probability that bonding steel leakage takes place surpasses 30%, is almost 70% with the further increase bleed-out probability of heat stove number.Use continuous casting covering slag of the present invention; in the liquid steel temperature frequent fluctuation and after constantly absorbing field trash; crystallizer hot-fluid all-the-time stable; can not occur the broadside hot-fluid along with the carrying out of sequence casting descends; the phenomenon that narrow limit hot-fluid rises, continuous casting covering slag of the present invention is suitable for the high pulling rate of sheet blank continuous casting and can keeps stable high crystallizer heat flow density.
4. design specific coiling temperature and strict control.Studies show that the 50CrV4 hot rolled steel plate discharges a large amount of latent heats of phase change in coiling process, will cause the volume that collapses if coiling temperature control is improper, coil of strip can't be delivered goods, need coiling temperature is set in specific scope and strict control, product volume type is good, does not have the volume phenomenon of collapsing for this reason.
5. product quality height.HRC hardness fluctuations after the Quenching Treatment and surface of steel plate decarburized layer deepness are the key technical indexes of weighing 50CrV4 hot rolled steel plate quality, and the back HRC hardness fluctuations that quenches usually is no more than 3, and the surface of steel plate decarburized layer deepness is not more than 2%.The 50CrV4 hot rolled steel plate that the present invention produces, structure property is even, and the HRC hardness fluctuations is not more than 2.5 after the Quenching Treatment; The surface of steel plate decarburized layer deepness is less than 1.2% of steel plate thickness.
Description of drawings
Fig. 1 is in the embodiment of the invention one, the microstructure of the 50CrV4 hot rolled steel plate of being produced;
Fig. 2 is in the embodiment of the invention two, the microstructure of the 50CrV4 hot rolled steel plate of being produced;
Fig. 3 is in the embodiment of the invention three, the microstructure of the 50CrV4 hot rolled steel plate of being produced;
Fig. 4 is in the embodiment of the invention four, the microstructure of the 50CrV4 hot rolled steel plate of being produced;
Fig. 5 is in the embodiment of the invention five, the microstructure of the 50CrV4 hot rolled steel plate of being produced.
The specific embodiment
Below in conjunction with accompanying drawing embodiments of the invention are elaborated:
Embodiment one
The production method of the described 50CrV4 SPHC of present embodiment, this method technological process: the smelting of 150t uhp electric arc furnace, 150t ladle furnace refining, sheet blank continuous casting, soaking, high-pressure water descaling, hot continuous rolling, laminar flow cool off, batch.
Wherein, the molten steel chemical composition of adjusting after the refining is: C 0.50wt%, and Si 0.30wt%, Mn 1.00wt%, P 0.007wt%, S 0.010wt%, Cr 0.90wt%, V 0.15wt%, all the other are Fe and unavoidable impurities.
The bar strip continuous casting and rolling flow path technological parameter is: strand charging temperature T
Go intoBe 1050 ℃, molten steel overheat T
CrossBe 45 ℃, finishing temperature T
EventuallyBe 950 ℃, coiling temperature T
VolumeBe 620 ℃, continuous casting pulling rate S
DrawBe 5.5m/min, continuous casting liquid core is depressed L
Press15mm.
The physical and chemical index of used covering slag: fusion point is 950 ℃, and basicity is 0.82, and viscosity is 1300 ℃, 0.45 pool, and bulk density is 0.60Kg/L.
The microstructure of hot rolled steel plate is seen Fig. 1, and its performance sees Table 1.
Table 1
| Steel plate thickness mm | Rel MPa | Rm MPa | A ％ | Hot rolled steel plate hardness HRC | Back steel plate hardness fluctuations HRC quenches | Decarburized layer deepness % | The volume type |
| 5.7 | 640 | 935 | 10 | 23 | 2.2 | 0.3 | The volume type is good, does not have the volume that collapses |
Embodiment two
The production method of the described 50CrV4 SPHC of present embodiment, this method technological process: the smelting of 150t uhp electric arc furnace, 150t ladle furnace refining, sheet blank continuous casting, soaking, high-pressure water descaling, hot continuous rolling, laminar flow cool off, batch.Wherein, the molten steel chemical composition of adjusting after the refining is: C 0.53wt%, and Si 0.25wt%, Mn 0.80wt%, P 0.012wt%, S 0.003wt%, Cr 0.95wt%, V 0.10wt%, all the other are that Fe and inevitable matter are assorted.
The bar strip continuous casting and rolling flow path technological parameter is: strand charging temperature T
Go intoBe 1020 ℃, molten steel overheat T
CrossBe 42 ℃, finishing temperature T
EventuallyBe 900 ℃, coiling temperature T
VolumeBe 600 ℃, continuous casting pulling rate S
Draw5.2m/min continuous casting liquid core is depressed L
Press10mm.
The physical and chemical index of used covering slag among this embodiment: fusion point is 1045 ℃, and basicity is 0.92, and viscosity is 1300 ℃, 0.95 pool, and bulk density is 0.40Kg/L.
The microstructure of hot rolled steel plate is seen Fig. 2, and performance sees Table 2.
Table 2
| Steel plate thickness mm | Rel MPa | Rm MPa | A ％ | Hot rolled steel plate hardness HRC | Back steel plate hardness fluctuations HRC quenches | Decarburized layer deepness % | The volume type |
| 4.7 | 620 | 965 | 21 | 24 | 2.0 | 0.5 | The volume type is good, does not have the volume that collapses |
Embodiment three
The production method of the described 50CrV4 SPHC of present embodiment, this method technological process: the smelting of 150t uhp electric arc furnace, 150t ladle furnace refining, sheet blank continuous casting, soaking, high-pressure water descaling, hot continuous rolling, laminar flow cool off, batch.
The molten steel chemical composition is: C 0.51wt%, and Si 0.20wt%, Mn 0.90wt%, P 0.015wt%, S 0.006wt%, Cr1.00wt%, V 0.12wt%, all the other are that Fe and inevitable matter are assorted.
The bar strip continuous casting and rolling flow path technological parameter is: strand charging temperature T
Go intoBe 980 ℃, molten steel overheat T
CrossBe 38 ℃, finishing temperature T
EventuallyBe 850 ℃, coiling temperature T
VolumeBe 580 ℃, continuous casting pulling rate S
Draw4.7m/min continuous casting liquid core is depressed L
Press5mm.
The physical and chemical index of used covering slag among this embodiment: fusion point is 997 ℃, and basicity is 1.02, and viscosity is 1300 ℃, 1.45 pools, and bulk density is 0.80Kg/L.
The microstructure of hot rolled steel plate is seen Fig. 3, and performance sees Table 3.
Table 3
| Steel plate thickness mm | Rel MPa | Rm MPa | A ％ | Hot rolled steel plate hardness HRC | Back steel plate hardness HRC quenches | Decarburized layer deepness % | The volume type |
| 3.5 | 705 | 1030 | 15.0 | 26 | 2.1 | 0.8 | The volume type is good, does not have the volume that collapses |
Embodiment four
The production method of the described 50CrV4 SPHC of present embodiment, this method technological process: the smelting of 150t uhp electric arc furnace, 150t ladle furnace refining, sheet blank continuous casting, soaking, high-pressure water descaling, hot continuous rolling, laminar flow cool off, batch.Wherein, the molten steel chemical composition is: C 0.47wt%, and Si 0.38wt%, Mn 0.70wt%, P 0.024wt%, S 0.020wt%, Cr1.20wt%, V 0.18wt%, all the other are Fe and unavoidable impurities;
The bar strip continuous casting and rolling flow path technological parameter is: strand charging temperature T
Go intoBe 910 ℃, molten steel overheat T
CrossBe 32 ℃, finishing temperature T
EventuallyBe 880 ℃, coiling temperature T
VolumeBe 560 ℃, continuous casting pulling rate S
Draw3.6m/min continuous casting liquid core is depressed L
Press3mm.
The physical and chemical index of used covering slag among this embodiment: fusion point is 975 ℃, and basicity is 0.87, and viscosity is 1300 ℃, 0.70 pool, and bulk density is 0.50Kg/L.
The microstructure of hot rolled steel plate is seen Fig. 4, and performance sees Table 4.
Table 4
| Steel plate thickness mm | Rel MPa | Rm MPa | A ％ | Hot rolled steel plate hardness HRC | Back steel plate hardness fluctuations HRC quenches | Decarburized layer deepness % | The volume type |
| 5.1 | 640 | 975 | 21.5 | 24.7 | 2.1 | 1.1 | The volume type is good, does not have the volume that collapses |
Embodiment five
The production method of the described 50CrV4 SPHC of present embodiment, this method technological process: the smelting of 150t uhp electric arc furnace, 150t ladle furnace refining, sheet blank continuous casting, soaking, high-pressure water descaling, hot continuous rolling, laminar flow cool off, batch.The molten steel chemical composition is: C 0.55wt%, and Si 0.10wt%, Mn 1.10wt%, P 0.020wt%, S 0.015wt%, Cr1.10wt%, V 0.25wt%, all the other are Fe and unavoidable impurities;
The bar strip continuous casting and rolling flow path technological parameter is: strand charging temperature T
Go intoBe 950 ℃, molten steel overheat T
CrossBe 35 ℃, finishing temperature T
EventuallyBe 925 ℃, coiling temperature T
VolumeBe 650 ℃, continuous casting pulling rate S
Draw4.1m/min continuous casting liquid core is depressed 20mm.
The physical and chemical index of used covering slag among this embodiment: fusion point is 1020 ℃, and basicity is 0.97, and viscosity is 1300 ℃, 1.20 pools, and bulk density is 0.70Kg/L.
The microstructure of hot rolled steel plate is seen Fig. 5, and performance sees Table 5.
Table 5
| Steel plate thickness mm | Rel MPa | Rm MPa | A ％ | Hot rolled steel plate hardness HRC | Back steel plate hardness fluctuations HRC quenches | Decarburized layer deepness % | The volume type |
| 4.6 | 630 | 995 | 20 | 25 | 2.0 | 1.0 | The volume type is good, does not have the volume that collapses |
From embodiment 1-5 as can be seen, according to the 50CrV4 hot rolled steel plate that the inventive method is produced, structure property is even, and the HRC hardness fluctuations is not more than 2.5 after the Quenching Treatment; The surface of steel plate decarburized layer deepness is less than 1.2% of steel plate thickness, and product volume type is good, does not have the volume that collapses.The degree of superheat of molten steel is high more, and the strand charging temperature is high more, and decarburized layer is thin more, and properties of product are good more.
Be specific embodiments of the invention only below, do not limit protection scope of the present invention with this; Any replacement and the improvement done on the basis of not violating the present invention's design all belong to protection scope of the present invention.
Claims (5)
1. the production method of a 50CrV4 SPHC is characterized in that, adopts bar strip continuous casting and rolling flow path, specifically comprises: smelting, refining, sheet blank continuous casting, soaking, high-pressure water descaling, hot continuous rolling, laminar flow cooling, coiling technique process;
Wherein, the chemical composition of molten steel is after the refining, C:0.47～0.55wt%, Si≤0.40wt%, Mn:0.70～1.10wt%, P≤0.025wt%, S≤0.025wt%, Cr:0.90～1.20wt%, V:0.10～0.25wt%, all the other are Fe and unavoidable impurities;
The bar strip continuous casting and rolling flow path technological parameter is: continuous casting pulling rate S
DrawBe 3.5m/min≤S
Draw≤ 5.5m/min, strand charging temperature T
Go intoBe 900 ℃≤T
Go into≤ 1050 ℃, finishing temperature T
EventuallyBe 850 ℃≤T
Eventually≤ 950 ℃, coiling temperature T
VolumeBe 550 ℃≤T
Volume≤ 650 ℃; Molten steel overheat T
CrossBe 30 ℃＜T
Cross≤ 45 ℃, strand liquid core is depressed L
PressBe 5mm≤L
Press≤ 15mm;
The cast of employing covering slag, the physical and chemical index of described covering slag: fusion point is 997 ± 50 ℃, and basicity is 0.92 ± 0.1, and viscosity is 0.95 ± 0.5 pool in the time of 1300 ℃, and bulk density is 0.60 ± 0.2Kg/L.
2. the production method of 50CrV4 SPHC as claimed in claim 1, it is characterized in that, the chemical composition of molten steel is after the described refining, C:0.50～0.53wt%, Si:0.20～0.30wt%, Mn:0.80～1.00wt%, P≤0.015wt%, S≤0.015wt%, Cr:0.90～1.00wt%, V:0.10～0.15wt%, all the other are Fe and unavoidable impurities.
3. as the production method of each described 50CrV4 SPHC of claim 1-2, it is characterized in that described molten steel overheat T
CrossBe 35 ℃≤T
Cross≤ 45 ℃, strand charging temperature T
Go intoBe 950 ℃≤T
Go into≤ 1050 ℃.
4. the production method of 50CrV4 SPHC as claimed in claim 3 is characterized in that, described molten steel overheat T
CrossBe 40 ℃≤T
Cross≤ 45 ℃, strand charging temperature T
Go intoBe 1000 ℃≤T
Go into≤ 1050 ℃.
5. as the production method of each described 50CrV4 SPHC of claim 1-2, it is characterized in that described coiling temperature T
VolumeBe 580 ℃≤T
Volume≤ 620 ℃.
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| CN111876664B (en) * | 2020-06-19 | 2022-04-12 | 江阴兴澄特种钢铁有限公司 | Manufacturing method of 50CrVA hot-rolled wide spring steel plate |
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| CN1483521A (en) * | 2002-09-19 | 2004-03-24 | 鞍钢集团新钢铁有限责任公司 | Method for continuous casting, continuoccs rolling intermediate and thin sheet blanket |
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| CN1483521A (en) * | 2002-09-19 | 2004-03-24 | 鞍钢集团新钢铁有限责任公司 | Method for continuous casting, continuoccs rolling intermediate and thin sheet blanket |
Non-Patent Citations (2)
| Title |
|---|
| JP特开2001-353564A 2001.12.25 |
| 易良刚等.50CrV4瓦楞辊用无缝钢管的研制.《四川冶金》.2005,第27卷(第4期),21-23. * |
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