CN102873293B - Continuous casting process for cold forging steel for low carbon boron-containing standard components - Google Patents
Continuous casting process for cold forging steel for low carbon boron-containing standard components Download PDFInfo
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- CN102873293B CN102873293B CN201210358753.0A CN201210358753A CN102873293B CN 102873293 B CN102873293 B CN 102873293B CN 201210358753 A CN201210358753 A CN 201210358753A CN 102873293 B CN102873293 B CN 102873293B
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Abstract
The invention relates to a continuous casting process for steel in the field of metallurgy, in particular to a continuous casting process for cold forging steel for low carbon boron-containing standard components. Casting powder special for the cold forging steel for the low carbon boron-containing standard components comprises the following chemical compositions in percentage by weight: 31+/-1.0 percent of SiO2, 25.0+/-4.0 percent of CaO, 10.5+/-4.0 percent of Al2O3, less than or equal to 1.5 percent of Fe2O3, less than or equal to 4.5 percent of MgO, less than or equal to 2+/-1.5 percent of F-, 9.0+/-1.0 percent of K2O+Na2O, 16+/-2.0 percent of C solid and less than or equal to 0.5 percent of H2O. By the continuous casting process, a water gap can be effectively prevented from blocking the normal crystallizer liquid level fluctuation in the casting process, small corner cracks of casting blanks are avoided, the continuous casting is smooth, the internal and external quality of the casting blanks are high, and the surfaces of the casting blanks are not provided with cracks.
Description
Technical field
The present invention relates to the continuous casting process of a kind of steel of field of metallurgy, specifically the continuous casting process of cold-forging steel for a kind of low-carbon boron-containing standard component.
Background technology
Cold-forging steel, claims again riveting spiral shell steel or cold upsetting steel, is the plasticity of utilizing metal, adopts the higher steel for standard part of cold-heading processing and forming technology production interchangeability.Cold-forging steel cold forming capability is good, replace hot rolling material cold machining machined at mechanical processing industry with cold-drawn, the advantage of this technique is to save a large amount of man-hours, metal consumption can reduce by 10% ~ 30% simultaneously, and product size precision is high, surface smoothness good and productivity ratio is high, it is the more advanced mechanical processing technique rising over nearly 10 years.It mainly uses manufacturer's standard part, non-standard securing member and various machine components.Cold-forging steel product is widely used in all kinds of securing members such as manufacturing bolt, nut, screw; Another important use is to manufacture the spare and accessory parts of cold extrusion parts and various cold upset formings, and this purposes, along with automobile industry development gets up, progressively expands the fields such as electrical equipment, camera, textile equipment, machine-building to.Cold-forging steel is that development is rapid at present, the efficient kind of one having wide range of applications.
The actual quality of Steel for cold heading processing still can not meet standard component industry requirement, to a certain extent dependence on import completely.According to customs statistics, the securing member of the annual import of China is at 12～130,000 tons.Along with the fast development of fastener industry, new steel grade is constantly developed and is introduced, external outlet is also increasing, with the technological progress of the every profession and trades such as automobile, oil, machinery, supporting securing member is proposed to many new demands, not still in form size, and be on performance and reliability, be actually fastener material is proposed to higher requirement.
The rapid growth of automobile industry has strengthened the demand to ferrous materials, although China lasting for years become the first in the world great Chan steel state, automobile engine and critical component steel for fastener are due to the restriction of strength condition or taking imported product as main.Simultaneously high performance and the light-weighted development trend of automobile, to proposed higher design stress and light-weighted requirement as the securing member of attaching parts, steel for fastener high strength is the effective way that solves this requirement.
In order to increase the market competitiveness of securing member, in improving steel performance and metallurgical quality, also require to reduce production cost, omit or simplify working process, reduce the consumption to the energy.Therefore developed low, the middle carbon high-strength boron steel of saving alloying element.The basic principle of its Composition Design is to reduce phosphorus content, improves the cold deformation ability of steel, adds 0.0005% ~ 0.0035% boron, to make up the intensity that causes because of carbon drop and the loss of quenching degree.Also can add as required in addition the alloying elements such as the addition of C r, Mn, Ti, further improve quenching degree.The feature of boron steel is that steel product cost reduces because a small amount of boron replaces a large amount of alloying elements, and carbon and alloying element content are low, and hot rolling wire can be processed in the cold-heading of direct drawing thing, does not need spheroidizing processing in advance, has saved the manufacturing cost of securing member.But this type of steel grade, during continuous casting, is prone to nozzle blocking, and liquid level fluctuation of crystallizer is large, the situation that pourability is poor.Sometimes there is the little transverse fissure in intensive bight in strand, corresponding wire rod surface produces in a large number and scabs, and yield rate is not high; Sometimes there is lateral recesses and longitudinally cave in and association crackle in face, and part strand cannot be processed use by reconditioning, can only scrap.
Summary of the invention
Technical problem to be solved by this invention is, the shortcoming existing for above prior art, the continuous casting process of a kind of low-carbon boron-containing standard component cold-forging steel is proposed, can effectively prevent the normal liquid level fluctuation of crystallizer of casting process nozzle blocking, the little transverse fissure in strand bight, continuous casting is smooth, and strand inside and outside quality is good, surperficial flawless.
The technical scheme that the present invention solves above technical problem is:
A continuous casting process for cold-forging steel for low-carbon boron-containing standard component, continuous casting adopts full guard cast, and centre is unwrapped and is watered front filling argon gas, and ladle adopts long nozzle argon envelope protection cast to tundish; Tundish adopts overall in-built submersed nozzle protection cast to crystallizer; In middle bag, molten steel uses coverture; Tundish continuous temperature measurement; In continuous casting process, mold liquid level adopts full-automatic liquid level to detect; Pulling speed of continuous casting is controlled automatically by the tundish degree of superheat; Crystallizer and two cold automatic distribution waters; In casting process crystallizer, use low-carbon boron-containing standard component cold-forging steel mould flux, the chemical composition that low-carbon boron-containing standard component comprises by weight percentage with cold-forging steel mould flux is: SiO
2: 31 ± 1.0%, CaO:25.0 ± 4.0%, Al
2o
3: 10.5 ± 4.0%, Fe
2o
3:≤1.5%, MgO :≤4.5%, F
-:≤2 ± 1.5%, K
2o+Na
2o:9.0 ± 1.0%, C
gu: 16 ± 2.0%, H
2o≤0.5%, the weight percent sum of above each composition is 100%;
Low-carbon boron-containing standard component by cold-forging steel mould flux operation is: casting machine starts before cast, described covering slag is put into covering slag oven to be toasted, baking temperature control is 140 ± 10 DEG C, and baking time is 40 ± 10min, guarantees that covering slag is dry abundant with preheating; In casting process, covering slag must spare no effort on a small quantity, each stream adds 0.5 ± 0.1kg at every turn, be 5 ± 1min circulation timei, guarantees that the top of the slag of covering slag in crystallizer keeps stable, and the total thickness of slag layer of covering slag is at 4 ± 0.5cm, maintain suitable three-decker, be slag layer, sinter layer and liquid slag layer three-decker from top to bottom, the visual top of the slag must not show, and operative employee carries out the cleaning work of primary crystallization device slag band every 10 ± 3min; In continuous casting working procedure, vibration mode adopts high-frequency and little amplitude, vibration frequency be 180-208 time/per minute, amplitude is 3-4mm.
The technical scheme that the present invention further limits is:
The continuous casting process of cold-forging steel for aforesaid low-carbon boron-containing standard component; low-carbon boron-containing standard component by the physical index of cold-forging steel mould flux is: fusing point (DEG C): 1170 ± 50; viscosity (Pa.s/1300 DEG C; pass): 1.2 ± 0.5; molten speed (s/1350 DEG C): 46 ± 5; granularity (0.15-1mm):>=90%, unit weight (g/cm
3): 0.60 ± 0.2.
The continuous casting process of cold-forging steel for aforesaid low-carbon boron-containing standard component, the chemical composition that the coverture that in middle bag, molten steel uses comprises is by weight percentage: CaO+MgO:20～30%, SiO
2: 45～55%, Al
2o
3≤ 9%, Fe
2o
3≤ 1.5%, C≤10%, the weight percent sum of above each composition is 100%.
The invention has the beneficial effects as follows: use after the present invention, during continuous casting, be not prone to nozzle blocking, liquid level fluctuation of crystallizer is little, and pourability is good, and strand there will not be the little transverse fissure in intensive bight, corresponding wire rod surface can not produce in a large number and scab, and yield rate is high; Face there will not be lateral recesses and longitudinally caves in and association crackle.The present invention can effectively prevent the normal liquid level fluctuation of crystallizer of casting process nozzle blocking, the little transverse fissure in strand bight, and continuous casting is smooth, and strand inside and outside quality is good, surperficial flawless.
Detailed description of the invention
embodiment 1
The present embodiment is the continuous casting process of a kind of low-carbon boron-containing standard component cold-forging steel, and continuous casting adopts full guard cast, and centre is unwrapped and watered front filling argon gas, and ladle adopts long nozzle argon envelope protection cast to tundish; Tundish adopts overall in-built submersed nozzle protection cast to crystallizer; In middle bag, molten steel uses coverture; Tundish continuous temperature measurement; In continuous casting process, mold liquid level adopts full-automatic liquid level to detect; Pulling speed of continuous casting is controlled automatically by the tundish degree of superheat; Crystallizer and two cold automatic distribution waters; In casting process crystallizer, use low-carbon boron-containing standard component cold-forging steel mould flux, low-carbon boron-containing standard component is as follows with cold-forging steel mould flux physicochemical property:
The chemical composition that low-carbon boron-containing standard component comprises by weight percentage with cold-forging steel mould flux is: SiO
2: 30%, CaO:29%, Al
2o
3: 6.5%, Fe
2o
3: 1.5%, MgO:4.5%, F
-: 0.5%, K
2o+Na
2o:10%, C
gu: 17.5%, H
2o:0.5%.
Low-carbon boron-containing standard component by the physical index of cold-forging steel mould flux is: fusing point (DEG C): 1170, viscosity (Pa.s/1300 DEG C passes): 1.2, molten speed (s/1350 DEG C): 46, granularity (0.15-1mm): 90%, unit weight (g/cm
3): 0.60.
The chemical composition that the coverture that in middle bag, molten steel uses comprises is by weight percentage: CaO+MgO:25%, SiO
2: 55%, Al
2o
3: 9%, Fe
2o
3: 1%, C:10%.
Low-carbon boron-containing standard component by cold-forging steel mould flux operation is: casting machine starts, before cast, described covering slag to be put into covering slag oven and toast, and baking temperature control is 140 DEG C, and baking time is 40min, guarantees that covering slag is dry abundant with preheating; In casting process, covering slag must spare no effort on a small quantity, each stream adds 0.5kg at every turn, be 5min circulation timei, guarantees that the top of the slag of covering slag in crystallizer keeps stable, and the total thickness of slag layer of covering slag is at 4cm, maintain suitable three-decker, be slag layer, sinter layer and liquid slag layer three-decker from top to bottom, the visual top of the slag must not show, and operative employee carries out the cleaning work of primary crystallization device slag band every 10min; In continuous casting working procedure, vibration mode adopts high-frequency and little amplitude, vibration frequency be 180 times/per minute, amplitude is 3mm.
embodiment 2
The present embodiment is the continuous casting process of a kind of low-carbon boron-containing standard component cold-forging steel, and continuous casting adopts full guard cast, and centre is unwrapped and watered front filling argon gas, and ladle adopts long nozzle argon envelope protection cast to tundish; Tundish adopts overall in-built submersed nozzle protection cast to crystallizer; In middle bag, molten steel uses coverture; Tundish continuous temperature measurement; In continuous casting process, mold liquid level adopts full-automatic liquid level to detect; Pulling speed of continuous casting is controlled automatically by the tundish degree of superheat; Crystallizer and two cold automatic distribution waters; In casting process crystallizer, use low-carbon boron-containing standard component cold-forging steel mould flux, low-carbon boron-containing standard component is as follows with cold-forging steel mould flux physicochemical property:
The chemical composition that low-carbon boron-containing standard component comprises by weight percentage with cold-forging steel mould flux is: SiO
2: 31%, CaO:25%, Al
2o
3: 10%, Fe
2o
3: 1%, MgO:3.5%, F
-: 3.5%, K
2o+Na
2o:9%, C
gu: 16.5%, H
2o:0.5%.
Low-carbon boron-containing standard component by the physical index of cold-forging steel mould flux is: fusing point (DEG C): 1120, viscosity (Pa.s/1300 DEG C passes): 0.7, molten speed (s/1350 DEG C): 41, granularity (0.15-1mm): 92%, unit weight (g/cm
3): 0.40.
The chemical composition that the coverture that in middle bag, molten steel uses comprises is by weight percentage: CaO+MgO:30%, SiO
2: 53%, Al
2o
3: 7%, Fe
2o
3: 0.5%, C:9.5%.
Low-carbon boron-containing standard component by cold-forging steel mould flux operation is: casting machine starts, before cast, described covering slag to be put into covering slag oven and toast, and baking temperature control is 130 DEG C, and baking time is 30min, guarantees that covering slag is dry abundant with preheating; In casting process, covering slag must spare no effort on a small quantity, each stream adds 0.4kg at every turn, be 4min circulation timei, guarantees that the top of the slag of covering slag in crystallizer keeps stable, and the total thickness of slag layer of covering slag is at 3.5cm, maintain suitable three-decker, be slag layer, sinter layer and liquid slag layer three-decker from top to bottom, the visual top of the slag must not show, and operative employee carries out the cleaning work of primary crystallization device slag band every 7min; In continuous casting working procedure, vibration mode adopts high-frequency and little amplitude, vibration frequency be 200 times/per minute, amplitude is 3.5mm.
embodiment 3
The present embodiment is the continuous casting process of a kind of low-carbon boron-containing standard component cold-forging steel, and continuous casting adopts full guard cast, and centre is unwrapped and watered front filling argon gas, and ladle adopts long nozzle argon envelope protection cast to tundish; Tundish adopts overall in-built submersed nozzle protection cast to crystallizer; In middle bag, molten steel uses coverture; Tundish continuous temperature measurement; In continuous casting process, mold liquid level adopts full-automatic liquid level to detect; Pulling speed of continuous casting is controlled automatically by the tundish degree of superheat; Crystallizer and two cold automatic distribution waters; In casting process crystallizer, use low-carbon boron-containing standard component cold-forging steel mould flux, low-carbon boron-containing standard component is as follows with cold-forging steel mould flux physicochemical property:
The chemical composition that low-carbon boron-containing standard component comprises by weight percentage with cold-forging steel mould flux is: SiO
2: 32%, CaO:21%, Al
2o
3: 14.5%, Fe
2o
3: 0.5%, MgO:2%, F
-: 3%, K
2o+Na
2o:8.5%, C
gu: 18%, H
2o:0.5%.
Low-carbon boron-containing standard component by the physical index of cold-forging steel mould flux is: fusing point (DEG C): 1220, viscosity (Pa.s/1300 DEG C passes): 1.7, molten speed (s/1350 DEG C): 51, granularity (0.15-1mm): 95%, unit weight (g/cm
3): 0.80.
The chemical composition that the coverture that in middle bag, molten steel uses comprises is by weight percentage: CaO+MgO:28%, SiO
2: 54%, Al
2o
3: 8%, Fe
2o
3: 1.5%, C:8.5%.
Low-carbon boron-containing standard component by cold-forging steel mould flux operation is: casting machine starts, before cast, described covering slag to be put into covering slag oven and toast, and baking temperature control is 150 DEG C, and baking time is 50min, guarantees that covering slag is dry abundant with preheating; In casting process, covering slag must spare no effort on a small quantity, each stream adds 0.6kg at every turn, be 6min circulation timei, guarantees that the top of the slag of covering slag in crystallizer keeps stable, and the total thickness of slag layer of covering slag is at 4.5cm, maintain suitable three-decker, be slag layer, sinter layer and liquid slag layer three-decker from top to bottom, the visual top of the slag must not show, and operative employee carries out the cleaning work of primary crystallization device slag band every 13min; In continuous casting working procedure, vibration mode adopts high-frequency and little amplitude, vibration frequency be 208 times/per minute, amplitude is 4mm.
In addition to the implementation, the present invention can also have other embodiments.All employings are equal to the technical scheme of replacement or equivalent transformation formation, all drop on the protection domain of requirement of the present invention.
Claims (2)
1. a continuous casting process for cold-forging steel for low-carbon boron-containing standard component, continuous casting adopts full guard cast, and centre is unwrapped and is watered front filling argon gas, and ladle adopts long nozzle argon envelope protection cast to tundish; Tundish adopts overall in-built submersed nozzle protection cast to crystallizer; In tundish, molten steel uses coverture; Tundish continuous temperature measurement; In continuous casting process, mold liquid level adopts full-automatic liquid level to detect; Pulling speed of continuous casting is controlled automatically by the tundish degree of superheat; Crystallizer and two cold automatic distribution waters; Described low-carbon boron-containing standard component by cold-forging steel mould flux operation is: casting machine starts before cast, described covering slag is put into covering slag oven to be toasted, baking temperature control is 140 ± 10 DEG C, and baking time is 40 ± 10min, guarantees that covering slag is dry abundant with preheating; In casting process, covering slag must spare no effort on a small quantity, each stream adds 0.5 ± 0.1kg at every turn, be 5 ± 1min circulation timei, guarantees that the top of the slag of covering slag in crystallizer keeps stable, and the total thickness of slag layer of covering slag is at 4 ± 0.5cm, maintain suitable three-decker, be slag layer, sinter layer and liquid slag layer three-decker from top to bottom, the visual top of the slag must not show, and operative employee carries out the cleaning work of primary crystallization device slag band every 10 ± 3min;
It is characterized in that: in casting process crystallizer, use low-carbon boron-containing standard component cold-forging steel mould flux, the chemical composition that described low-carbon boron-containing standard component comprises by weight percentage with cold-forging steel mould flux is: SiO
2: 31 ± 1.0%, CaO:25.0 ± 4.0%, Al
2o
3: 10.5 ± 4.0%, Fe
2o
3:≤1.5%, MgO :≤4.5%, F
-: 2 ± 1.5%, K
2o+Na
2o:9.0 ± 1.0%, C
gu: 16 ± 2.0%, H
2o≤0.5%, the weight percent sum of above each composition is 100%;
In continuous casting working procedure, vibration mode adopts high-frequency and little amplitude, vibration frequency be 180-208 time/per minute, amplitude is 3-4mm;
Described low-carbon boron-containing standard component by the physical index of cold-forging steel mould flux is: fusing point DEG C: 1170 ± 50, and viscosity Pa.s/1300 DEG C: 1.2 ± 0.5, molten fast s/1350 DEG C: 46 ± 5, granularity 0.15-1mm:>=90%, unit weight g/cm
3: 0.60 ± 0.2.
2. the continuous casting process of cold-forging steel for low-carbon boron-containing standard component as claimed in claim 1, is characterized in that: the chemical composition that the coverture that in described tundish, molten steel uses comprises is by weight percentage: CaO+MgO:20～30%, SiO
2: 45～55%, Al
2o
3≤ 9%, Fe
2o
3≤ 1.5%, C≤10%, the weight percent sum of above each composition is 100%.
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| CN105842108B (en) * | 2016-03-22 | 2019-05-14 | 中国石油大学(华东) | A kind of measuring method of catalytic cracked oil pulp solid content |
| CN106180623A (en) * | 2016-07-25 | 2016-12-07 | 江阴兴澄特种钢铁有限公司 | A kind of continuous casting process producing high titanium abrasion-resistant stee on straight-bow type continuous casting machine |
| CN107790654B (en) * | 2016-09-06 | 2019-08-06 | 鞍钢股份有限公司 | A kind of control method of low-carbon Al killed cold heading steel continuous casting square billet pattern cracking |
| CN107475608A (en) * | 2017-07-28 | 2017-12-15 | 江苏省沙钢钢铁研究院有限公司 | A kind of manufacture method for improving low-carbon and adding boron steel wire rod surface quality |
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| JPS63203249A (en) * | 1987-02-16 | 1988-08-23 | Sumitomo Metal Ind Ltd | Continuous casting method for dead low carbon steel |
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