CN101745535A - Method for producing 75Cr1 hot-rolled sheet steel - Google Patents
Method for producing 75Cr1 hot-rolled sheet steel Download PDFInfo
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Abstract
The invention provides a method for producing high-quality 75Cr1 hot-rolled sheet steel based on the continuous thin slab casting and rolling process, which mainly adopts the following process flow: smelting, refining, continuous thin slab casting, soaking, hot continuous rolling, cooling and coiling. The superheat T of molten steel is larger than 30 DEG C and less than or equal to 45 DEG C, the charging temperature T of the cast slab is larger than or equal to 900 DEG C and less than or equal to 1050 DEG C, the finish rolling temperature T is larger than or equal to 850 DEG C and less than or equal to 950 DEG C, the coiling temperature T is larger than or equal to 550 DEG C and less than or equal to 630 DEG C, and the drawing speed S of continuous casting is larger than or equal to 3.5m/min and less than or equal to 5.5m/min; mold flux casting is adopted; and the chemical composition of molten steel is as follows: 0.70 percent to 0.80 percent by weight of C, 0.20 percent to 0.45 percent by weight of Si, 0.60 percent to 0.90 percent by weight of Mn, 0.025 percent by weight or less of P, 0.025 percent by weight or less of S, 0.30 percent to 0.60 percent by weight of Cr and 0.02 percent to 0.08 percent by weight of V. When the method is adopted to produce the 75Cr1 hot-rolled sheet steel, the segregation, porosity and cracks of the cast slab are reduced, and the 75Cr1 hot-rolled sheet steel is characterized by uniform microstructure and properties and high fatigue resistance.
Description
Technical field
The invention belongs to the alloy tool steel production technical field, be specially adapted to adopt bar strip continuous casting and rolling flow path to produce the method for 75Cr1 hot rolled steel plate.
Technical background
Alloy tool steel 75Cr1 has high hardness, toughness, wearability, is mainly used in high-end high-grade alloy tool manufacturing, comprises fields such as high accuracy saw blade, extraordinary instrument/cutlery and special spring.
Because above-mentioned application requires material must possess some performance, existing certain intensity simultaneously can not be too soft, and comprehensively being presented as to have enough hardness; Another important feature on the matrix is in use to be subjected to strong vibration.From the instructions for use and the actual conditions of matrix, to the technical parameter requirement of material, the quenching hardness difference of having stipulated macroscopical technical standard matrix is in 3HRC.So need on composition and technology controlling and process, take new design and processes route, reduce the segregation that sulphide inculsion quantity and phosphorus cause interior tissue, the high-carbon steel of production high strength at lower cost satisfies requirement of client.
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 performing creative labours.Technology and the method for above-mentioned patent except mentioning that not alloy tool steel is concrete, the while is not mentioned the concrete solution of the key technical problem that the alloy tool steel production process exists yet, and does not particularly mention technology of preparing and the method for 75Cr1.
Summary of the invention
The purpose of this invention is to provide a kind of method of producing the 75Cr1 hot rolled steel plate based on bar strip continuous casting and rolling flow path.The 75Cr1 hot rolled steel plate that adopts the method for the invention to produce has reduced the quantity and the segregation of field trash, has the uniform characteristics of enough hardness and structure property.
The present invention is achieved by the following technical programs:
A kind of method of producing the 75Cr1 hot rolled steel plate adopts bar strip continuous casting and rolling flow path, and mainly comprise electric furnace or converter smelting, refining, sheet blank continuous casting, strand soaking, hot continuous rolling, laminar flow cooling, batch step,
Wherein, the chemical composition that refining process carries out the molten steel after the Alloying Treatment is: C0.70～0.80wt%, Si0.20～0.45wt%, Mn0.60～0.90wt%, P≤0.025wt%, S≤0.025wt%, Cr0.30～0.60wt%, V0.02～0.08wt%, all the other are Fe and unavoidable impurities;
The technological parameter of described bar strip continuous casting and rolling flow path 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≤ 630 ℃, molten steel overheat T
CrossBe 30 ℃＜T
Cross≤ 45 ℃;
The cast of employing covering slag, the physical and chemical index of described covering slag: fusion point is 997 ± 40 ℃, and basicity is 0.92 ± 0.1, and viscosity is 1300 ℃, 0.95 ± 0.4 pool, bulk density is 0.60 ± 0.2Kg/L.
The fatigue and cyclic cycle reaches more than 1,000,000 times, and monolateral decarburized layer deepness is 0.3～1.2% of a steel plate thickness.
Preferably, the chemical composition of described molten steel is: C0.70～0.80wt%, Si0.20～0.40wt%, Mn0.60～0.80wt%, P≤0.010wt%, S≤0.004wt%, Cr0.30～0.40wt%, V0.02～0.04wt%, all the other are Fe and unavoidable impurities; The fatigue and cyclic cycle reaches more than 1,500,000 times.
Preferably, described technological parameter also comprises: strand liquid core is depressed L
PressBe 2mm≤L
Press≤ 20mm.
Preferably, described strand charging temperature is T
Go intoBe 950 ℃≤T
Go into≤ 1050 ℃, monolateral decarburized layer deepness is 0.3～0.9% of a steel plate thickness; More preferably, described strand charging temperature T
Go intoBe 1000 ℃≤T
Go into≤ 1050 ℃, monolateral decarburized layer deepness is 0.3～0.6% of a steel plate thickness; Described coiling temperature T
VolumeBe 580 ℃≤T
Volume≤ 620 ℃.
The present invention has improved the quality of 75Cr1 hot rolled steel plate by optimizing and revising the concrete technological parameter that the 75Cr1 hot rolled steel plate is produced, and particularly, characteristics of the present invention are:
1. adopt low-phosphorous and the low-sulfur control technology, guarantee the fatigue behaviour of product.
Alloy tool steel 75Cr1 is mainly used in high-end high-grade alloy tool manufacturing, and the major reason that causes product quality is fatigue rupture, has a strong impact on its serviceability and scope.Show after deliberation, produce tired main cause and be the segregation that sulphide inculsion and phosphorus cause in the steel, so the control of p and s is the key of alloy tool steel 75Cr1 quality control in the steel.In order to ensure the fatigue behaviour of product, adopted low p and s control technology.
2. continuous casting adopts high molten steel overheat, has broken through traditional technological limit.For guaranteeing slab quality, adopt low overheat cast (degree of superheat is 15～30 ℃) usually.But (liquidus temperature is about 1463 ℃ because the 75Cr1 liquidus temperature is low, liquidus temperature than mild steel commonly used hangs down about 70 ℃), 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;
3. adopt the liquid core to depress technology, improve the uniformity of continuous casting billet structure.In the casting blank solidification process, adopt the liquid core to depress technology, reduced segregation, loose and underbead crack, improved the quality of strand, lay a good foundation for obtaining high-quality final hot rolled steel plate;
4. 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, wide hot-fluid of casting process crystallizer progressively descends, and the leptoprosopy hot-fluid rises, and along with connecting the increase of watering the stove number, the probability that bonding steel leakage takes place surpasses 30%.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.
5. strict control coiling temperature.Studies show that the 75Cr1 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, and needs coiling temperature is set in certain scope and strict control for this reason.
6. product quality height.The method that adopts the present invention to propose is produced high-quality 75Cr1 hot rolled steel plate, and be embodied in the following aspects: (1) structure property is even, and difference of hardness is not more than 2.5HRC after the Quenching Treatment; (2) the monolateral decarburized layer deepness of steel plate is less than 1.2% of thickness.(3) the product scroll is good, does not have the volume phenomenon of collapsing.
Description of drawings
Fig. 1 organizes schematic diagram for the steel plate that embodiment 1 produces;
Fig. 2 organizes schematic diagram for the steel plate that embodiment 2 produces;
Fig. 3 organizes schematic diagram for the steel plate that embodiment 3 produces;
Fig. 4 organizes schematic diagram for the steel plate that embodiment 4 produces;
Fig. 5 organizes schematic diagram for the steel plate that embodiment 5 produces.
The specific embodiment
Below in conjunction with accompanying drawing embodiments of the invention are elaborated:
Embodiment 1:
The described method of producing the 75Cr1 hot rolled steel plate based on bar strip continuous casting and rolling flow path of present embodiment, 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 chemical component weight percentage proportioning (wt%) that refining process carries out the molten steel after the Alloying Treatment is: C0.70, and Si0.20, Mn0.60, P0.010, S0.004, Cr0.30, V0.02, all the other are Fe and unavoidable impurities.
Technological parameter: strand charging temperature T
Go intoBe 908 ℃, molten steel overheat T
CrossBe 31 ℃, finishing temperature T
EventuallyBe 855 ℃, coiling temperature T
VolumeBe 560 ℃, continuous casting pulling rate S
Draw3.6m/min continuous casting liquid core is depressed 3mm, slab thickness 67mm.
The physical and chemical index of covering slag: fusion point is 1035 ℃, and basicity is 1.0, and viscosity is 1300 ℃, 1.25 pools, and bulk density is 0.78Kg/L.
The microstructure of hot rolled strip is seen Fig. 1, and its performance sees Table 1.
Table 1
| Thickness of strips mm | ??Rel??MPa | ??Rm??MPa | ??A％ | Quench the back with plate difference of hardness HRC | Field trash (D) | Monolateral decarburized layer deepness % | The volume type | Fatigue and cyclic week (ten thousand times) |
| ??4.6 | ??840 | ??1005 | ??12 | ??2.0 | ??1.5 | ??0.85 | The volume type is good, and volume does not collapse | ??185 |
Embodiment 2:
The described method of producing the 75Cr1 hot rolled steel plate based on bar strip continuous casting and rolling flow path of present embodiment, 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 chemical component weight percentage proportioning (wt%) that refining process carries out the molten steel after the Alloying Treatment is: C0.80, and Si0.45, Mn0.90, P0.023, S0.023, Cr0.60, V0.08, all the other are Fe and unavoidable impurities.
Technological parameter: strand charging temperature T
Go intoBe 980 ℃, molten steel overheat T
CrossBe 44 ℃, finishing temperature T
EventuallyBe 945 ℃, coiling temperature T
VolumeBe 630 ℃, continuous casting pulling rate S
DrawBe 5.4m/min, continuous casting liquid core is depressed 18mm, slab thickness 52mm.
The physical and chemical index of covering slag: fusion point is 959 ℃, and basicity is 0.83, and viscosity is 1289 ℃, 0.56 pool, and bulk density is 0.42Kg/L.
The microstructure of hot rolled strip is seen Fig. 2, and performance sees Table 2.
Table 2
| Thickness of strips mm | ??Rel??MPa | ??Rm??MPa | ??A％ | Quench the back with plate difference of hardness HRC | Field trash (D) | Monolateral decarburized layer deepness % | The volume type | Fatigue and cyclic week (ten thousand times) |
| ??4.0 | ??800 | ??1035 | ??11 | ??2.2 | ??1.5 | ??1.05 | The volume type is good, and volume does not collapse | ??127 |
Embodiment 3:
The method that present embodiment is produced the 75Cr1 hot rolled steel plate based on bar strip continuous casting and rolling flow path, 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 chemical component weight percentage proportioning (wt%) that refining process carries out the molten steel after the Alloying Treatment is: C0.75, and Si0.40, Mn0.80, P0.010, S0.009, Cr0.40, V0.04, all the other are Fe and unavoidable impurities.
Technological parameter: strand charging temperature T
Go intoBe 950 ℃, molten steel overheat T
CrossBe 39 ℃, finishing temperature T
EventuallyBe 880 ℃, coiling temperature T
VolumeBe 623 ℃, continuous casting pulling rate S
Draw4.3m/min continuous casting liquid core is depressed 6mm, slab thickness 64mm.
The physical and chemical index of covering slag: fusion point is 993 ℃, and basicity is 0.92, and viscosity is 1300 ℃, 0.97 pool, and bulk density is 0.61Kg/L.
The microstructure of hot rolled strip is seen Fig. 3, and performance sees Table 3.
Table 3
| Thickness of strips mm | ??Rel??MPa | ??Rm??MPa | ??A％ | Quench the back with plate difference of hardness HRC | Field trash (D) | Monolateral decarburized layer deepness % | The volume type | Fatigue and cyclic week (ten thousand times) |
| ??3.5 | ??808 | ??1005 | ??14 | ??1.6 | ??1.0 | ??0.75 | The volume type is good, and volume does not collapse | ??180 |
Embodiment 4
The method that present embodiment is produced the 75Cr1 hot rolled steel plate based on bar strip continuous casting and rolling flow path, 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 chemical component weight percentage proportioning (wt%) that refining process carries out the molten steel after the Alloying Treatment is: C0.78, and Si0.35, Mn0.65, P0.011, S0.003, Cr0.50, V0.07, all the other are Fe and unavoidable impurities.
Technological parameter: strand charging temperature T
Go intoBe 980 ℃, molten steel overheat T
CrossBe 42 ℃, finishing temperature T
EventuallyBe 910 ℃, coiling temperature T
VolumeBe 625 ℃, continuous casting pulling rate S
Draw4.2m/min continuous casting liquid core is depressed 10mm, slab thickness 60mm.
The physical and chemical index of covering slag: fusion point is 1000 ℃, and basicity is 0.92, and viscosity is 1300 ℃, 0.98 pool, and bulk density is 0.60Kg/L.
The microstructure of hot rolled strip is seen Fig. 4, can see Table 4.
Table 4
| Thickness of strips mm | ??Rel??MPa | ??Rm??MPa | ??A％ | Quench the back with plate difference of hardness HRC | Field trash (D) | Monolateral decarburized layer deepness % | The volume type | Fatigue and cyclic week (ten thousand times) |
| ??2.6 | ??880 | ??1085 | ??15 | ??1.5 | ??1.0 | ??0.5 | The volume type is good, and volume does not collapse | ??215 |
Embodiment 5
The method that present embodiment is produced the 75Cr1 hot rolled steel plate based on bar strip continuous casting and rolling flow path, 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 chemical component weight percentage proportioning (wt%) that refining process carries out the molten steel after the Alloying Treatment is: C0.76, and Si0.33, Mn0.77, P0.008, S0.001, Cr0.50, V0.06, all the other are Fe and unavoidable impurities.
Technological parameter: strand charging temperature T
Go intoBe 1000 ℃, molten steel overheat T
CrossBe 44 ℃, finishing temperature T
EventuallyBe 900 ℃, coiling temperature T
VolumeBe 600 ℃, continuous casting pulling rate S
Draw5.3m/min continuous casting liquid core is depressed 15mm, slab thickness 55mm.
The physical and chemical index of covering slag: fusion point is 997 ℃, and basicity is 0.92, and viscosity is 1300 ℃, 0.96 pool, and bulk density is 0.60Kg/L.
The microstructure of hot rolled strip is seen Fig. 5, can see Table 5.
Table 5
| Thickness of strips mm | ??Rel??MPa | ??Rm??MPa | ??A％ | Quench the back with plate difference of hardness HRC | Field trash (D) | Monolateral decarburized layer deepness % | The volume type | Fatigue and cyclic week (ten thousand times) |
| ??2.0 | ??870 | ??1095 | ??16 | ??1.3 | ??0.5 | ??0.32 | The volume type is good, and volume does not collapse | ??235 |
The every performance indications of 75Cr1 hot rolled steel plate that this embodiment produces, better than other embodiment.
More than be at the specifying of possible embodiments of the present invention, but this embodiment is not in order to limiting claim of the present invention, does not allly break away from the equivalence that skill spirit of the present invention does and implement or change, all should be contained in the claim of the present invention.
Claims (6)
1. a method of producing the 75Crl hot rolled steel plate is characterized in that, adopts bar strip continuous casting and rolling flow path, mainly comprise electric furnace or converter smelting, refining, sheet blank continuous casting, strand soaking, hot continuous rolling, laminar flow cooling, batch step,
Wherein, the chemical composition that refining process carries out the molten steel after the Alloying Treatment is: C 0.70～0.80wt%, Si 0.20～0.45wt%, Mn 0.60～0.90wt%, P≤0.025wt%, S≤0.025wt%, Cr 0.30～0.60wt%, V 0.02～0.08wt%, all the other are Fe and unavoidable impurities;
The technological parameter of described bar strip continuous casting and rolling flow path 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≤ 630 ℃, molten steel overheat T
CrossBe 30 ℃＜T
Cross≤ 45 ℃;
The cast of employing covering slag, the physicochemical property of described covering slag is: fusion point is 997 ± 40 ℃, and basicity is 0.92 ± 0.1, and viscosity is 1300 ℃, 0.95 ± 0.4 pool, bulk density is 0.60 ± 0.2Kg/L.
2. the production method of 75Crl hot rolled steel plate according to claim 1, it is characterized in that, the chemical composition of described molten steel is: C 0.70～0.80wt%, Si 0.20～0.40wt%, Mn 0.60～0.80wt%, P≤0.010wt%, S≤0.004wt%, Cr0.30～0.40wt%, V 0.02～0.04wt%, all the other are Fe and unavoidable impurities; The fatigue and cyclic cycle reaches more than 1,500,000 times.
3. the production method of 75Crl hot rolled steel plate according to claim 1 is characterized in that, described technological parameter also comprises: strand liquid core is depressed L
PressBe 2mm≤L
Press≤ 20mm.
4. according to the production method of each described 75Crl hot rolled steel plate of claim 1-3, it is characterized in that described strand charging temperature is T
Go intoBe 950 ℃≤T
Go into≤ 1050 ℃.
5. the production method of 75Crl hot rolled steel plate according to claim 4 is characterized in that, described strand charging temperature T
Go intoBe 1000 ℃≤T
Go into≤ 1050 ℃.
6. according to the production method of each described 75Crl hot rolled steel plate of claim 1-3, it is characterized in that described coiling temperature T
VolumeBe 580 ℃≤T
Volume≤ 620 ℃.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106222385A (en) * | 2016-07-22 | 2016-12-14 | 武汉钢铁股份有限公司 | The production method of high carbon tool steel hot rolled steel sheet |
| CN109504895A (en) * | 2018-09-14 | 2019-03-22 | 浙江龙盛薄板有限公司 | A kind of saw bit matrix wide cut steel band and its manufacturing method |
| CN113857448A (en) * | 2021-11-29 | 2021-12-31 | 东北大学 | Low-alkalinity coating-free protective slag for continuous casting of hot forming steel |
| CN114700364A (en) * | 2022-03-30 | 2022-07-05 | 张家港宏昌钢板有限公司 | Method for improving hot rolling stability of 75Cr1 saw blade steel |
| CN115710677A (en) * | 2022-11-15 | 2023-02-24 | 包头钢铁（集团）有限责任公司 | Method for improving uneven quenching hardness of 75Cr1 saw blade steel |
-
2010
- 2010-01-21 CN CN2010100195567A patent/CN101745535B/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106222385A (en) * | 2016-07-22 | 2016-12-14 | 武汉钢铁股份有限公司 | The production method of high carbon tool steel hot rolled steel sheet |
| CN109504895A (en) * | 2018-09-14 | 2019-03-22 | 浙江龙盛薄板有限公司 | A kind of saw bit matrix wide cut steel band and its manufacturing method |
| CN113857448A (en) * | 2021-11-29 | 2021-12-31 | 东北大学 | Low-alkalinity coating-free protective slag for continuous casting of hot forming steel |
| CN114700364A (en) * | 2022-03-30 | 2022-07-05 | 张家港宏昌钢板有限公司 | Method for improving hot rolling stability of 75Cr1 saw blade steel |
| CN114700364B (en) * | 2022-03-30 | 2024-05-14 | 张家港宏昌钢板有限公司 | Method for improving hot rolling stability of 75Cr1 saw blade steel |
| CN115710677A (en) * | 2022-11-15 | 2023-02-24 | 包头钢铁（集团）有限责任公司 | Method for improving uneven quenching hardness of 75Cr1 saw blade steel |
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