CN103643122A - 75Cr hot-rolled plate coil produced from thin sheet billets through continuous casting and continuous rolling and production method thereof - Google Patents
75Cr hot-rolled plate coil produced from thin sheet billets through continuous casting and continuous rolling and production method thereof Download PDFInfo
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- CN103643122A CN103643122A CN201310715443.4A CN201310715443A CN103643122A CN 103643122 A CN103643122 A CN 103643122A CN 201310715443 A CN201310715443 A CN 201310715443A CN 103643122 A CN103643122 A CN 103643122A
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Abstract
The invention discloses a 75Cr hot-rolled plate coil produced from thin sheet billets through continuous casting and continuous rolling and a production method thereof. The 75Cr hot-rolled plate coil comprises the following chemical ingredients in percentage by weight: 0.73-0.78% of C, 0.25-0.40% of Si, 0.65-0.90% of Mn, not higher than 0.020% of P, not higher than 0.012% of S, 0.30-0.60% of Cr, 0.015-0.03% of Als and the balance of Fe and inevitable impurities. The production method has the advantages that the production problems of large liquid level fluctuation, caking, unstable heat flow and the like appearing during the continuous casting of thin sheet billets under the condition of high pulling rate and the quality problems of surface crackle, center segregation, center porosity and the like of casting blanks are solved, and a stable production technology for 75Cr steel in a thin-sheet continuous casting and continuous rolling production line is realized. The 75Cr plate coil has the advantages that the surface quality is good, cracks and slag inclusions are not discovered, the structure property is uniform, the tensile strength is 920-1010MPa, the yield strength is 490-820MPa, the elongation percentage is 13-24%, and the Brinell hardness is 270-320HBW.
Description
Technical field
The present invention relates to a kind of high-grade steel saw blade production field, 75Cr hot-rolled sheet coil and method thereof that especially a kind of CSP is produced.
Background technology
75Cr instrument is extremely strong by steel hardness, has good wear resistance, can be widely used in the fields such as matrix making of high-grade saw blade, has higher added value and wide market outlook.
CSP production technology, the development of having complied with iron and steel epoch modern techniquies, has brought into play the advantage of short flow process, can produce thin plate (band) volume that approaches trimmed size.The condition of production has following characteristics and advantages: thin plate blank continuously casting and continuously rolling technology can cover the kind of most of hot-rolled sheet coils, but can't produce the variety steel of some properties and high added value completely; The technical superiority of CSP short-flow production line maximum can provide total length temperature uniform slab to milling train exactly, thereby for rolling obtains a uniform mechanical property of whole length and Hot-rolled Middle Plate shape and thickness and precision, control good prerequisite guarantee is provided, and can realize well by the technique such as semi-endless rolled the rolling of thin specification; Because the strand of the thin sheet continuous casting machine cooling intensity in crystallizer is stronger, its secondary and three dendrite are shorter, and by dynamic soft depressing and two cold controls, the loose and microsegregation of strand can obtain larger improvement, and internal soundness is improved.The performance of product is more even, stable.Development and production not yet on 75Cr high carbon steel sheet continuous casting and rolling production line at home, lacks technical support, the extensive use based on 75Cr and property, and it has very large DEVELOPMENT PROSPECT.
There is following subject matter in the Development and Production prior art of 75Cr: in 75Cr steel, carbon content is high, manganese content is also higher, and alloying constituent is complicated, in metallurgical production process, easily cause centre burst, center segregation and center porosity, cause finished product structure property skewness; The liquidus temperature of 75Cr is lower, and hot strength is poor, easily produces casting billet surface slag inclusion and surface crack; 75Cr solidified shell under high pulling rate is thinner, and bonding accident easily occurs; Due to process furnace heating for a long time, easily cause the decarburization of 75Cr casting billet surface to increase the weight of, thereby affected surface hardness and the quality of finished product.
Summary of the invention
The technical problem to be solved in the present invention is to provide the 75Cr hot-rolled sheet coil that a kind of CSP that can eliminate surface imperfection and internal soundness problem is produced; The present invention also provides a kind of method of 75Cr hot-rolled sheet coil of CSP production.
For solving the problems of the technologies described above, the technical solution used in the present invention is: its chemical composition and weight percent are: C 0.73～0.78%, Si 0.25～0.40%, Mn 0.65～0.90%, P≤0.020%, S≤0.012%, Cr 0.30～0.60%, Als 0.015～0.03%, all the other are Fe and inevitable impurity.
The inventive method comprises the steps: 1) employing converter smelting, and carry out external refining to its alloying, its chemical composition and weight percent are controlled: C:0.73～0.78%, Si:0.25%～0.40%, Mn:0.65～0.90%, P≤0.020%, S≤0.012%, Cr:0.30～0.60%, Als:0.015～0.03%, and all the other are Fe and inevitable impurity;
2) carry out continuous casting, superheating temperature is controlled at 15～35 ℃, and slab thickness is controlled at 65～90mm, and pulling rate is controlled at 4.3～4.7m/min;
3) carry out process furnace homogeneous heating, it is 900～980 ℃ that strand charging temperature is controlled;
4) carry out finish rolling, it is 820 ℃～860 ℃ that finishing temperature is controlled;
5) batch, it is 700～750 ℃ that coiling temperature is controlled.
Step described in the inventive method (2) casting process, the crystallizer protecting residue of employing following weight composition proportion: CaO 20～24%, Al2O3 3.0～3.5%, SiO2 25～28%, MgO 6.0～7.0%, F 11～12%, Na
2o 12～14%, Fe
2o
31～2%, MnO
2≤ 0.2%, Li
2o 3.0～5.0%, surplus carbon and uncontrollable impurity; Hemisphere point temperature is 730～780 ℃, and viscosity is 0.7～0.8Pas.
Adopt the beneficial effect that technique scheme produces to be: the invention solves that the level fluctuation occurring under the high pulling rate condition of sheet blank continuous casting is large, bonding and the production problem such as hot-fluid is unstable, and the quality problems such as slab surface crack, center segregation and center porosity; Realized the stably manufactured technology of 75Cr steel on sheet continuous casting and rolling production line.The surface quality of the 75Cr coiled sheet that the present invention produces is good, does not find crackle and slag inclusion, and structure property is even, and its tensile strength is 920～1010Mpa; Yield strength is: 490～820Mpa, and unit elongation is 13～24%, Brinell hardness is 270～320HBW.
Accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments, the present invention is further detailed explanation.
Fig. 1 is the metallographic structure schematic diagram of the 75C coiled sheet produced of the embodiment of the present invention 1;
Fig. 2 is the metallographic structure schematic diagram of the 75C coiled sheet produced of the embodiment of the present invention 2.
Embodiment
Embodiment 1: the 75Cr hot-rolled sheet coil of producing with CSP, adopts following step.
(1) adopt converter smelting, and carry out external refining to its alloying, its chemical composition and weight percent are: C 0.74%, Si 0.27%, Mn 0.68%, P≤0.015%, S≤0.005%, Cr 0.34%, Als 0.023%, all the other are Fe and inevitable impurity.
(2) carry out continuous casting, superheating temperature is 28 ℃, adopts 75Cr special crystallizer covering slag, and slab thickness is controlled at 65mm, and pulling rate is controlled at 4.5m/min; The composition proportion of crystallizer protecting residue is: CaO 22%, Al
2o
33.2%, SiO
227%, MgO 6.0%, F 11.5%, Na
2o 13%, Fe
2o
31.01%, MnO
20.1%, Li
20 3.46%, surplus carbon and uncontrollable impurity; Hemisphere point temperature is 730～780 ℃, and viscosity is 0.7～0.8Pas.
(3) carry out process furnace homogeneous heating, reduce process furnace heat-up time, it is 940～945 ℃ that strand charging temperature is controlled.
(4) carry out finish rolling, it is 845 ℃ that finishing temperature is controlled.
(5) batch, it is 736 ℃ that coiling temperature is controlled.
In the present embodiment, as shown in Figure 1, mechanical property is in Table 1 in coiled sheet metallographic structure.
The mechanical property of the 75Cr hot-rolled sheet coil of table 1: embodiment 1
Embodiment 2: the 75Cr hot-rolled sheet coil of producing with CSP, adopts following step.
(1) adopt converter smelting, and carry out external refining to its alloying, its chemical composition and weight percent are: C 0.75%, Si 0.26%, Mn 0.69%, P≤0.013%, S≤0.004%, Cr 0.36%, Als 0.022%, all the other are Fe and inevitable impurity.
(2) carry out continuous casting, superheating temperature is 25 ℃, adopts 75Cr special crystallizer covering slag, and slab thickness is controlled at 70mm, and pulling rate is controlled at 4.4m/min; The composition proportion of crystallizer protecting residue is: CaO 20%, Al
2o
33.3%, SiO
228%, MgO 6.5%, F 11%, Na
2o 12.5%, Fe
2o
31.58%, MnO
20.18%, Li
20 3.47%, surplus carbon and uncontrollable impurity; Hemisphere point temperature is 730～780 ℃, and viscosity is 0.7～0.8Pas.
(3) carry out process furnace homogeneous heating, reduce process furnace heat-up time, it is 950～955 ℃ that strand charging temperature is controlled.
(4) carry out finish rolling, it is 848 ℃ that finishing temperature is controlled.
(5) batch, it is 739 ℃ that coiling temperature is controlled.
In the present embodiment, as shown in Figure 2, mechanical property is in Table 2 in coiled sheet metallographic structure.
The mechanical property of the 75Cr hot-rolled sheet coil of table 2: embodiment 2
Embodiment 3: the 75Cr hot-rolled sheet coil of producing with CSP, adopts following step.
(1) adopt converter smelting, and carry out external refining to its alloying, its chemical composition and weight percent are: C 0.78%, Si 0.25%, Mn 0.65%, P≤0.020%, S≤0.006%, Cr 0.60%, Als 0.03%, all the other are Fe and inevitable impurity.
(2) carry out continuous casting, superheating temperature is 15 ℃, adopts 75Cr special crystallizer covering slag, and slab thickness is controlled at 80mm, and pulling rate is controlled at 4.3m/min; The composition proportion of crystallizer protecting residue is: CaO 24%, Al
2o
33.0%, SiO
226%, MgO 7.0%, F 11.5%, Na
2o 14%, Fe
2o
31.48%, MnO
20.07%, Li
20 3.0%, surplus carbon and uncontrollable impurity; Hemisphere point temperature is 730～780 ℃, and viscosity is 0.7～0.8Pas.
(3) carry out process furnace homogeneous heating, reduce process furnace heat-up time, it is 975～980 ℃ that strand charging temperature is controlled.
(4) carry out finish rolling, it is 820 ℃ that finishing temperature is controlled.
(5) batch, it is 700 ℃ that coiling temperature is controlled.
The mechanical property of the present embodiment gained 75Cr hot-rolled sheet coil is in Table 3.
The mechanical property of the 75Cr hot-rolled sheet coil of table 3: embodiment 3
Embodiment 4: the 75Cr hot-rolled sheet coil of producing with CSP, adopts following step.
(1) adopt converter smelting, and carry out external refining to its alloying, its chemical composition and weight percent are: C 0.73%, Si 0.40%, Mn 0.90%, P≤0.012%, S≤0.012%, Cr 0.30%, Als 0.015%, all the other are Fe and inevitable impurity.
(2) carry out continuous casting, superheating temperature is 35 ℃, adopts 75Cr special crystallizer covering slag, and slab thickness is controlled at 90mm, and pulling rate is controlled at 4.7m/min; The composition proportion of crystallizer protecting residue is: CaO 21%, Al
2o
33.5%, SiO
225%, MgO 7.0%, F 12%, Na
2o 12%, Fe
2o
31.98%, MnO
20.10%, Li
20 4.9%, surplus carbon and uncontrollable impurity; Hemisphere point temperature is 730～780 ℃, and viscosity is 0.7～0.8Pas.
(3) carry out process furnace homogeneous heating, reduce process furnace heat-up time, it is 900～905 ℃ that strand charging temperature is controlled.
(4) carry out finish rolling, it is 860 ℃ that finishing temperature is controlled.
(5) batch, it is 750 ℃ that coiling temperature is controlled.
The mechanical property of the present embodiment gained 75Cr hot-rolled sheet coil is in Table 4.
The mechanical property of the 75Cr hot-rolled sheet coil of table 4: embodiment 4
Claims (3)
1. the 75Cr hot-rolled sheet coil that a CSP is produced, it is characterized in that, its chemical composition and weight percent are: C 0.73～0.78%, Si 0.25～0.40%, Mn 0.65～0.90%, P≤0.020%, S≤0.012%, Cr 0.30～0.60%, Als 0.015～0.03%, all the other are Fe and inevitable impurity.
2. a CSP is produced the method for 75Cr hot-rolled sheet coil, it is characterized in that, it comprises the steps: 1) employing converter smelting, and carry out external refining to its alloying, its chemical composition and weight percent are controlled: C:0.73～0.78%, Si:0.25%～0.40%, Mn:0.65～0.90%, P≤0.020%, S≤0.012%, Cr:0.30～0.60%, Als:0.015～0.03%, and all the other are Fe and inevitable impurity;
2) carry out continuous casting, superheating temperature is controlled at 15～35 ℃, and slab thickness is controlled at 65～90mm, and pulling rate is controlled at 4.3～4.7m/min;
3) carry out process furnace homogeneous heating, it is 900～980 ℃ that strand charging temperature is controlled;
4) carry out finish rolling, it is 820 ℃～860 ℃ that finishing temperature is controlled;
5) batch, it is 700～750 ℃ that coiling temperature is controlled.
3. according to the CSP described in claims 2, produce the method for 75Cr hot-rolled sheet coil, it is characterized in that, described step (2) casting process adopts the crystallizer protecting residue of following weight composition proportion: CaO 20～24%, Al
2o
33.0～3.5%, SiO
225～28%, MgO 6.0～7.0%, F 11～12%, Na
2o 12～14%, Fe
2o
31～2%, MnO
2≤ 0.2%, Li
2o 3.0～5.0%, surplus carbon and uncontrollable impurity; Hemisphere point temperature is 730～780 ℃, and viscosity is 0.7～0.8Pas.
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| CN201310715443.4A CN103643122B (en) | 2013-12-23 | 2013-12-23 | The 75Cr hot-rolled sheet coil that a kind of CSP is produced and method thereof |
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| CN103643122B CN103643122B (en) | 2016-01-20 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104480394A (en) * | 2014-11-17 | 2015-04-01 | 首钢总公司 | High-carbon low-alloy saw blade steel for cutting stone and metal and manufacturing method of hot-rolled steel plate made of high-carbon low-alloy saw blade steel |
| CN110284061A (en) * | 2019-06-28 | 2019-09-27 | 邯郸钢铁集团有限责任公司 | A kind of high temperature resistant deformation 75Cr1 steel saw blade and its production technology |
| CN111057962A (en) * | 2019-12-31 | 2020-04-24 | 河钢股份有限公司承德分公司 | Medium-high carbon steel 75Cr hot-rolled pickled plate and production method thereof |
| CN114622134A (en) * | 2022-02-09 | 2022-06-14 | 包头钢铁（集团）有限责任公司 | High-carbon manganese-chromium saw blade steel and production method thereof |
| CN115584438A (en) * | 2022-10-10 | 2023-01-10 | 湖南华菱涟源钢铁有限公司 | Ultrahigh carbon steel plate and manufacturing method thereof |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104480394A (en) * | 2014-11-17 | 2015-04-01 | 首钢总公司 | High-carbon low-alloy saw blade steel for cutting stone and metal and manufacturing method of hot-rolled steel plate made of high-carbon low-alloy saw blade steel |
| CN110284061A (en) * | 2019-06-28 | 2019-09-27 | 邯郸钢铁集团有限责任公司 | A kind of high temperature resistant deformation 75Cr1 steel saw blade and its production technology |
| CN111057962A (en) * | 2019-12-31 | 2020-04-24 | 河钢股份有限公司承德分公司 | Medium-high carbon steel 75Cr hot-rolled pickled plate and production method thereof |
| CN114622134A (en) * | 2022-02-09 | 2022-06-14 | 包头钢铁（集团）有限责任公司 | High-carbon manganese-chromium saw blade steel and production method thereof |
| CN115584438A (en) * | 2022-10-10 | 2023-01-10 | 湖南华菱涟源钢铁有限公司 | Ultrahigh carbon steel plate and manufacturing method thereof |
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Address after: 063016 Binhe Road, Hebei, Tangshan City, No. 9 Patentee after: River steel Limited by Share Ltd Tangshan branch Address before: 063016 Binhe Road, Hebei, Tangshan City, No. 9 Patentee before: Hebei Steel Co., Ltd., Tangshan Branch |