CN103600048A - Continuous open casting technique of high alloy stainless steel - Google Patents
Continuous open casting technique of high alloy stainless steel Download PDFInfo
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Abstract
Disclosed is a continuous open casting technique of high alloy stainless steel. The high alloy stainless steel is made from chemical components, including, not larger than 0.020 part of C, not larger than 1.00 part of Si, not larger than 2.00 parts of Mn, not larger than 0.045 part of P, not larger than 0.035 part of S, 19.00-23.00 parts of Cr, 4.00-5.00 parts of Mo, not larger than 0.100 part of N, 23.00-28.00 parts of Ni, 1.00-2.00 parts of Cu, and the balance of iron and unavoidable impurities. The technique includes: 1, operating plugging dummy ingots; 2, controlling off-taking of molten steel; 3, cooling a crystallizer; 4, controlling superheat of the molten steel. The continuous open casting technique of high alloy stainless steel has the advantages that the problem of steel leakage caused by connection cracking and cracking of blank shell thin parts during open casting of the high alloy stainless steel is solved, fewer production accidents occur, production efficiency is higher, and production cost is reduced greatly.
Description
Technical field
The present invention relates to the continuous casting method for pouring of high-alloy stainless steel, belong to Ferrous Metallurgy and material and manufacture field.
Background technology
Along with the develop rapidly of modern equipment manufacturing industry and science and technology, the high temperature resistance of material, corrosion resistance, intensity etc. are proposed to strict demand.And high alloy content stainless steel elevated temperature strength, resistance to high temperature oxidation, high temperature creep resistance and corrosion-resistant aspect there is excellent properties.
Because alloy content is high, (alloy content is between 31.5%-62.3% in process of production for this class steel, wherein, Cr is between 19.5%-22.3%, Ni is between 12%-40%, also have the elements such as Mo, Cu, Al, Ti, all the other are Fe element simultaneously), the problem such as fluidity molten steel is poor, process of setting thermal conductivity factor is low, cause continuous casting production difficulty larger, especially open and water bleed-out Frequent Accidents, cause that production efficiency is low, contract cannot be cashed, production cost is high, the quality of production is poor.
Summary of the invention
For solve in the dummy ingot material of high-alloy stainless steel molten steel in crystallizer circulation not smooth, solidify after the thin and layering in surface of base shell, base shell internal defect is not fine and close, imperfect, thereby cause base shell and dummy bar head bonding strength not enough, the problem of bleed-out ftractures under frictional resistance in crystallizer and thermal stress effect, reduce production accident, enhance productivity, product quality and reducing production costs, the invention provides a kind of high-alloy stainless steel continuous casting and open pouring technique method.
The chemical composition of high-alloy stainless steel is: C≤0.020; Si≤1.00; Mn≤2.00; P≤0.045; S≤0.035; Cr is 19.00～23.00; Mo is 4.00～5.00; N≤0.100; Ni is 23.00～28.00; Cu is 1.00～2.00; Surplus is iron and inevitable impurity.
The production process route of high-alloy stainless steel is electric arc furnaces (EAF) smelting-argon oxygen decarburizing furnace (AOD) refining-ladle refining furnace (LF) refining-Vertical Slab Caster (VCCM) cast.
technical scheme of the present invention: compriseblocking dummy ingot operation, molten steel emerges that controls, crystallizer are cooling, degree of superheat control, pouring slag technology.
1, blocking dummy ingot operation comprises the steps:
The first step, 4, spring or 5 are real by the tired ligation of iron wire, and specification is the crystallizer that 160mm is thick, ties 4 springs, specification is 5 springs of crystallizer bundle that 180mm is thick;
Second step, sends dummy bar head into crystallizer assigned position, purges totally with compressed air, guarantees to be dried, no-sundries; The asbestos cord that by diameter is Ф 30mm penetrates between copper plate of crystallizer and the gap of dummy bar head with crooked chisel, requires to tighten sturdy;
The 3rd step is put into the spring that two length are (750-800mm) in the dovetail groove of dummy bar head, and iron filings uniform spreading is sprinkling upon on dummy bar head, asbestos cord, and iron filings spreading THICKNESS CONTROL is at 2-3mm;
The 4th step, is placed on an iron web plate (950mm * 80mm) and two blocks of iron web plates (150mm * 180mm) on dummy bar head, and iron web plate limit portion is apart from copper plate of crystallizer >=25mm;
The 5th step, is put on iron web plate tying up solid spring in the first step, and blocking dummy ingot is complete.
2, the molten steel control of emerging
It is exactly that molten steel is unwrapped the beginning moment of beginning to enter crystallizer from centre that described molten steel is emerged.
Because high-alloy stainless steel fluidity molten steel is poor, for guaranteeing that in the complete and dummy ingot material of base shell, molten steel channel is unimpeded, in the mouth of a river steel-passing amount unwrapped after watering should follow first big after small principle, amplify the steel-passing amount of submersed nozzle early stage, when preventing that molten steel from circulating in dummy ingot material gap temperature reduce solidify, flow motionless, stop up molten steel filling channel, cause the under-filled deficiency of base head.After molten steel floods dummy ingot material, progressively steel-passing amount is reduced, with this, increase the cool time of base shell, improve thickness and the bonding strength of base shell.
Open while watering, accumulative total seedling-growing time is controlled according to 60s-95s.The 25-35s in early stage floods blocking dummy ingot material, and submersed nozzle steel-passing amount is controlled by 0.009 ton/s-0.012 ton/s.After molten steel floods dummy ingot material, add ready pouring slag, mouth of a river steel-passing amount is reduced simultaneously, according to 0.005 ton/s-0.006 ton/s, control.
The major name at a kind of mouth of a river of described submersed nozzle, english abbreviation is SEN.
3, crystallizer is cooling
Because the thermal conductivity factor of high-alloy stainless steel is lower, for guaranteeing in crystallizer that base shell is cooling, evenly avoid forming lobe, require the crystallizer intensity of cooling can not be excessive, but the shell thickness when guaranteeing out crystallizer end opening meets and draws steel requirement, and crystallizer intensity of cooling can not be too small.
Opening the casting speed that while watering, conticaster is set is automatically the starting pulling rate of 0.3m/min, and crystallizer cold in-water temperature requires≤36 ℃, and wide discharge is controlled at 2100-2300L/min, and leptoprosopy discharge is controlled at 270-300L/min.
4, the degree of superheat is controlled
By taking theoretical calculating and the hot means that combine of analyzing, draw the liquidus temperature of high-alloy stainless steel, at assurance shell thickness, enough resist under the prerequisite of resistance of billet withdrawal and thermal stress, promote as far as possible the degree of superheat of molten steel, promote on the one hand mobility and the dummy ingot material filling effect of molten steel, guarantee the floating effect of field trash simultaneously.For this reason, on the basis of liquidus curve, by industrial field, determine that the degree of superheat of molten steel is controlled between 35-55 ℃.
5, pouring slag technology
Due to ladle bottom rapid heat dissipation, bag end temperature is on the low side, enters after middle bag; liquid steel temperature further reduces; thereby cause to enter opening of crystallizer inside to water liquid steel temperature on the low side, easily cause fluidity molten steel bad, dummy ingot material is filled bad; the layering of base shell is imperfect; base head and dummy bar head bonding strength are not enough, meanwhile, lubricated owing to lacking covering slag; starting is drawn after steel due to frictional resistance and effect of stress, causes cracking bleed-out.
Water in the process of emerging opening, when molten steel floods dummy ingot material, on both sides, the mouth of a river, add pouring slag, addition is watered and time is controlled according to 5-8kg/, is divided into two parts, adds the bore portion that spues on water inlet both sides.Along with the rising of liquid level in crystallizer, pouring slag melts rapidly, covers molten steel surface, by pouring slag, generating heat on the one hand, is molten steel additional heat, promotes mobility and the heat-insulating property of molten steel, meanwhile, play the lubricated effect of base shell, reduce the resistance of billet withdrawal of base head.
The hot properties that the present invention is poor according to high-alloy stainless steel fluidity molten steel, thermal conductivity factor is low, by optimizing crystallizer blocking dummy ingot, molten steel, emerge, crystallizer is cooling, control molten steel overheat, simultaneously in conjunction with advanced pouring slag technology, solved in the dummy ingot material of high-alloy stainless steel molten steel in crystallizer circulation not smooth, solidify after the thin and layering in surface of base shell, base shell internal defect is not fine and close, imperfect, thereby cause base shell and dummy bar head bonding strength not enough, under frictional resistance in crystallizer and thermal stress effect, the problem of cracking bleed-out.The continuous casting that forms a set of high-alloy stainless steel is opened pouring technique, and this technique has uniqueness, novelty and practicality.
When the present invention has stopped to produce high-alloy stainless steel, the phenomenon of bleed-out, has greatly improved production efficiency, has reduced production cost.
For example: before implementing the present invention, it is 40% that the opening of high-alloy stainless steel watered breakout ratio, and each bleed-out affects production time 350min, and monthly bleed-out is 3 times; Each bleed-out damages two cold one section, the equipment loss of crystallizer and is about 400,000 RMB, production loss approximately 360,000 RMB;
The present invention opens and waters breakout ratio and be reduced to 0.Thereby promote conticaster calendar operating rate 2.35%;
The 2280000 yuan of RMB that monthly reduce the loss, thus ton steel cost reduces 57 yuan.
Accompanying drawing explanation
Fig. 1 is the layout schematic diagram (adding the top view before spring) of blocking dummy ingot material in crystallizer of the present invention.
Fig. 2 is the layout schematic diagram (adding the top view after spring) of blocking dummy ingot material in crystallizer of the present invention.
Fig. 3 is the right view of Fig. 2.
Wherein: 1-spring, 2-crystallizer, 3-asbestos cord, 4-iron web plate, 5-dovetail groove, 6-submersed nozzle.
The specific embodiment
Producing steel grade is super austenitic stainless steel 904L, and steel grade feature is alloy content high [Cr%+Ni%+Cu%+Mo% >=47%], belongs to super austenitic stainless steel, and solidified structure is full austenite, has good corrosion resistance.Production specification is 180mm * 1238mm.
904L steel grades: C≤0.020; Si≤1.00; Mn≤2.00; P≤0.045; S≤0.035; Cr is 19.00～23.00; Mo is 4.00～5.00; N≤0.100; Ni is 23.00～28.00; Cu is 1.00～2.00; Surplus is iron and inevitable impurity.
1, blocking dummy ingot
1.1 materials are prepared:
Dry clean iron filings, the asbestos cord winding, diameter is Ф 30mm, iron wire, mono-of iron web plate 4(950mm * 80mm, two of 180mm * 150mm), one of spring (two of 500mm, five of 1000mm), tired steelframe, the crooked chisel of pricking spring; Crooked chisel is the common tool of this area.
1.2 blocking dummy ingots (shown in Fig. 1, Fig. 2, Fig. 3)
The first step: first on the top of the shelf that the tired ligation of 5 springs, the 1 use iron wire of 1000mm specification is real, then asbestos cord is wound in to thigh, diameter is Ф 30mm;
Second step: dummy bar head is sent into crystallizer 2 assigned positions, purge totally with compressed air, guarantee to be dried, no-sundries.Asbestos cord 3 is penetrated between copper plate of crystallizer and the gap of dummy bar head, require to tighten sturdy;
The 3rd step: toward the short spring of putting into two 500mm in the dovetail groove 5 of dummy bar head, on dummy bar head, asbestos cord, THICKNESS CONTROL is at 2-3mm by the uniform spreading of iron filings.
The 3rd step: two blocks of iron web plates (150mm * 180mm) are placed on to dummy bar head two ends, and an iron web plate (950mm * 80mm) is placed on dummy bar head near dovetail groove part.Guarantee that iron web plate limit portion is from the distance of copper plate of crystallizer >=25mm.
The 4th step: put down gently on iron web plate tying up solid spring, blocking dummy ingot is complete.
2, crystallizer is cooling
Crystallizer cold in-water temperature is controlled at below 35 ℃, and wide discharge is 2100L/min, and leptoprosopy discharge is 300L/min.
3, the degree of superheat
By taking theoretical calculating and the hot means that combine of analyzing, show that the stainless liquidus temperature of 904L super austenitic is 1380 ℃, the degree of superheat is according to 53 ℃ of controls.
4, emerge
In unwrap and water after, the steel-passing amount of front 35s is controlled according to 0.01 ton/s, floods after dummy ingot material, adds pouring slag, steel-passing amount is reduced to 0.006 ton/s simultaneously, adds up to seedling-growing time to control as 80s.
5, add pouring slag
Pouring slag adopts the E841I(parameter of German metallurgical production to see the following form), addition is 10kg, is evenly added to the intermediate point of both sides, the mouth of a river and crystallizer leptoprosopy limit portion, adding opportunity is that molten steel adds while flooding dummy ingot material.
The chemical composition of pouring slag (mass percent): CaO+MgO is 34.0～36.0; SiO
2be 30.5～43.5; Al
2o
3be 2.0～4.0; Na
2o+K
2o is 6.5～9.0; Fe
2o
3be 12.0～16.5; MnO < 0.2; C
free< 1.0; C
totalbe 1.0～2.0; F is 8.0～12.0.
The physical index of pouring slag: H
2o
600 ℃< 0.8; Density is 0.8～1.0 kg/dm
3; Fusing point is 1100 ℃; 1300 ℃ of viscosity are 0.9 dPas.
Claims (1)
1. high-alloy stainless steel continuous casting is opened a pouring technique method, and the chemical composition of high-alloy stainless steel is: C≤0.020; Si≤1.00; Mn≤2.00; P≤0.045; S≤0.035; Cr is 19.00～23.00; Mo is 4.00～5.00; N≤0.100; Ni is 23.00～28.00; Cu is 1.00～2.00; Surplus is iron and inevitable impurity;
It is characterized in that:
(1) blocking dummy ingot operation comprises the steps:
The first step, by 4 or 5 tired ligation realities of iron wire for springs;
Second step, sends dummy bar head into crystallizer assigned position, purges totally with compressed air, guarantees to be dried, no-sundries; The asbestos cord that is Ф 30mm by diameter penetrates between copper plate of crystallizer and the gap of dummy bar head, requires to tighten sturdy;
The 3rd step is put into the spring that two length are 750～800mm in the dovetail groove of dummy bar head, and iron filings uniform spreading is sprinkling upon on dummy bar head, asbestos cord, and iron filings spreading THICKNESS CONTROL is at 2-3mm;
The 4th step, is placed on the iron web plate of the iron web plate of a 950mm * 80mm and two 150mm * 180mm on dummy bar head, and iron web plate limit portion is apart from copper plate of crystallizer >=25mm;
The 5th step, is put on iron web plate tying up solid spring in the first step, and blocking dummy ingot is complete;
(2) open while watering, accumulative total molten steel seedling-growing time is controlled according to 60s～95s; 25～the 35s in early stage floods blocking dummy ingot material, and submersed nozzle steel-passing amount is controlled by 0.009 ton/s～0.012 ton/s; After molten steel floods dummy ingot material, add ready pouring slag, mouth of a river steel-passing amount is controlled according to 0.005 ton/s～0.006 ton/s simultaneously; It is exactly that molten steel is unwrapped the moment of beginning to enter crystallizer from centre that described molten steel is emerged;
(3) opening the casting speed that while watering, conticaster is set is automatically the starting pulling rate of 0.3m/min, and crystallizer cold in-water temperature requires≤36 ℃, and wide discharge is controlled at 2100～2300L/min, and leptoprosopy discharge is controlled at 270～300L/min;
(4) degree of superheat of molten steel is controlled between 35-55 ℃; When molten steel floods dummy ingot material, on both sides, the mouth of a river, add pouring slag, addition is watered time control according to 5-8kg/, is divided into two parts, adds the hole site that spues on water inlet both sides.
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| CN107058905A (en) * | 2016-12-27 | 2017-08-18 | 振石集团东方特钢有限公司 | A kind of super austenitic stainless steel and preparation method thereof |
| CN107419194A (en) * | 2017-06-29 | 2017-12-01 | 振石集团东方特钢有限公司 | A kind of processing method of super austenitic stainless steel coiled sheet |
| CN108339954A (en) * | 2018-02-11 | 2018-07-31 | 福建三钢闽光股份有限公司 | It is a kind of improving continuous casting and open the cold burden of gravy with meat or vegetables poured over rice or noodles base condensation rate and intensity lay method |
| CN109365770A (en) * | 2018-11-20 | 2019-02-22 | 山东钢铁股份有限公司 | A method of it reducing continuous casting and opens base surface pores defect of gravying with meat or vegetables poured over rice or noodles |
| CN111318658A (en) * | 2020-03-24 | 2020-06-23 | 山西太钢不锈钢股份有限公司 | Invar alloy and continuous casting production method thereof |
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| CN113528928A (en) * | 2021-07-15 | 2021-10-22 | 山西太钢不锈钢股份有限公司 | Iron-nickel base alloy continuous casting billet for precision strip steel and production method thereof |
| CN114472836A (en) * | 2020-11-13 | 2022-05-13 | 上海梅山钢铁股份有限公司 | Method for preventing slab continuous casting high-carbon steel from casting and breakout |
| CN114799100A (en) * | 2022-05-05 | 2022-07-29 | 芜湖新兴铸管有限责任公司 | Continuous casting large round billet casting method |
| CN114951570A (en) * | 2021-02-26 | 2022-08-30 | 日照钢铁控股集团有限公司 | Use method of slag system for direct casting of 45Mn high-carbon steel |
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| CN108339954A (en) * | 2018-02-11 | 2018-07-31 | 福建三钢闽光股份有限公司 | It is a kind of improving continuous casting and open the cold burden of gravy with meat or vegetables poured over rice or noodles base condensation rate and intensity lay method |
| CN109365770A (en) * | 2018-11-20 | 2019-02-22 | 山东钢铁股份有限公司 | A method of it reducing continuous casting and opens base surface pores defect of gravying with meat or vegetables poured over rice or noodles |
| CN111318658A (en) * | 2020-03-24 | 2020-06-23 | 山西太钢不锈钢股份有限公司 | Invar alloy and continuous casting production method thereof |
| CN112475254A (en) * | 2020-10-28 | 2021-03-12 | 东北大学 | Method and device for controlling pulling speed and casting strip thickness of thin strip continuous casting machine |
| CN114472836A (en) * | 2020-11-13 | 2022-05-13 | 上海梅山钢铁股份有限公司 | Method for preventing slab continuous casting high-carbon steel from casting and breakout |
| CN114951570A (en) * | 2021-02-26 | 2022-08-30 | 日照钢铁控股集团有限公司 | Use method of slag system for direct casting of 45Mn high-carbon steel |
| CN114951570B (en) * | 2021-02-26 | 2023-09-08 | 日照钢铁控股集团有限公司 | Using method of 45Mn high-carbon steel direct casting slag system |
| CN113290216A (en) * | 2021-06-07 | 2021-08-24 | 西峡龙成冶金材料有限公司 | Casting slag for stainless steel continuous casting and application thereof |
| CN113290216B (en) * | 2021-06-07 | 2022-09-16 | 西峡龙成冶金材料有限公司 | Casting slag for stainless steel continuous casting and application thereof |
| CN113528928A (en) * | 2021-07-15 | 2021-10-22 | 山西太钢不锈钢股份有限公司 | Iron-nickel base alloy continuous casting billet for precision strip steel and production method thereof |
| CN114799100A (en) * | 2022-05-05 | 2022-07-29 | 芜湖新兴铸管有限责任公司 | Continuous casting large round billet casting method |
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