CN101451213A - Method for producing large thickness and high intensity steel plate for boiler drum - Google Patents
Method for producing large thickness and high intensity steel plate for boiler drum Download PDFInfo
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Abstract
The invention discloses a production method for a high tensile steel plate used for a high thickness boiler drum. The production method comprises the following steps: (1) smelting: smelting molten steel in an electric furnace, the refining the molten steel in an LF finer, adding 300 to 500 meters of Al thread, and carrying out vacuum treatment in a bale VD furnace when the temperature of the bale is more than or equal to 1600 DEG C; (2) casting: keeping the temperature between 1,545 and 1,555 DEG C after damaging the vacuum; (3) heating: realizing the sending, clearing and filling of a steel ingot at a moderate temperature, cooling down the furnace for over 30 minutes before steel filling, and stewing the steel for one hour; (4) rolling: adopting II type rolling control technology, and setting a first stage as an austenite recrystallization stage and a second stage as an austenite non-recrystallization stage; (5) water cooling: cooling down the rolled steel plate on line, and keeping the red temperature between 700 and 750 DEG C; (6) heat treatment: carrying out the normalizing plus tempering treatment of the steel plate; and (7) shot blasting: carrying out shot blasting before storing the steel plate in a warehouse so as to completely remove the iron sheet produced during heating. The method shortens the steel rolling and heating time, reduces the consumption of production energy, and meets the requirements of a plurality of heat cycles during the boiler manufacturing process. The steel plate has good welding performance.
Description
Technical field
The present invention relates to a kind of production method of large thickness and high intensity steel plate for boiler drum, relate in particular to the production method of a kind of 110-145mm boiler-steam dome with the 13MnNiMo54 steel plate.
Background technology
13MnNiMo5-4 (DIWA353) is a kind of close grain structural low of good weldability, this steel has higher middle temperature yield strength, good plasticity and toughness, and welding property is good, be applicable to hot and cold shaping and welding assembly, be specially adapted to working temperature and be not higher than 400 ℃ boiler drum, pressurized vessel, pipeline and other parts.For a long time, because steel plate thickness is very thick, the plate face width is big, the thickest at present 145mm that reaches, and product is for a long time (150-250 kilograms/cm of high temperature (350-450 ℃), high pressure
2) and certain corrosive environment in work, boiler industry is very harsh to the quality of material and security thereof and reliability requirement.The principal feature of these steel is: (1) thickness surpasses GB6654-96 standard limit 120mm specification; (2) steel plate easily produces surface quality such as iron sheet, crackle and roughness exceed standard in process of production.Look into newly through science and technology, surperficial though the steel of same level have production abroad because of iron sheet is pressed into the pit of generation, had a strong impact on the use of steel plate.
Summary of the invention
At the problems referred to above, the object of the present invention is to provide a kind of production method of large thickness and high intensity steel plate for boiler drum, the steel of producing has good obdurability coupling and visual appearance preferably.
To achieve these goals, technical scheme of the present invention has adopted a kind of production method of large thickness and high intensity steel plate for boiler drum, may further comprise the steps:
(1) smelt: molten steel is sent into the refining of LF refining furnace earlier through electrosmelting, and feeds 300～500 meters on Al line, when wrapping temperature 〉=1600 ℃ greatly, and the vacuum-treat of bull ladle VD stove;
(2) casting: the empty back temperature of destroying of fidelity is at 1545-1555 ℃;
(3) heating: steel ingot realizes that temperature is sent, Wen Qing, temperature dress, dries in the air stove more than 30 minutes before the dress steel, stewing steel 1 hour;
(4) rolling: adopt II type controlled rolling process, the fs is the austenite recrystallization stage, and between 1050～1150 ℃, former passage light reductions roll iron sheet and charge and attack surface of steel ingot repeatedly with high pressure water, with the Ex-all iron sheet; Reduction in pass is 8～25% then, and accumulative total draft 〉=70% makes austenite generation perfect recrystallization, with refine austenite crystal grain; Subordinate phase is the non-recrystallize stage of austenite, start rolling temperature≤950 ℃, finishing temperature≤920 ℃, in this stage, austenite crystal is elongated, form high-density mechanical twin and deformed belt in the austenite of non-recrystallization in elongation, simultaneously microalloy carbon, nitride are separated out because of deformation induced, thereby have increased ferritic nucleation site, refinement ferrite crystal grain, this stage draft should be tried one's best greatly, accumulative total draft 〉=50%;
(5) water-cooled: the steel plate after rolling carries out online cooling, returns red temperature and is 700-750 ℃;
(6) thermal treatment: steel plate is carried out normalizing+temper, and normalizing temperature is 920-940 ℃, and be 4min/mm total heat-up time, carries out the cooling of entry groove after the normalizing, and steel plate returns red temperature≤200 ℃, and tempering temperature is 670-690 ℃, and soaking time is 2.8min/mm;
(7) ball blast: through Shot Blasting, thoroughly remove the iron sheet that produces when heating before the steel plate friendship storehouse.
Need to add SiCa piece 90-110kg in the molten steel per ton before the vacuum in the step (1), vacuum tightness is 0.5 torr, destroy vacuum during vacuum hold-time 〉=25 minute, depend merely on the deoxidation of Al line, the higher phenomenon of nonmetallic inclusionsin steel content, guaranteed the purity of steel to have solved molten steel.
Casting in the step (2) adopts 31T slab ingot mould to cast, and has guaranteed that big thickness, big substance steel plate have the enough draught and the raw material of becoming a useful person.
Step (3) adopts low speed to burn steel, heat-up rate below 1000 ℃≤120 ℃/h, 1260 ℃ of maximum heating temperatures are tiny to guarantee the abundant solid solution of alloying element, r crystal grain.
Easily except that well lowering the temperature 10～20 ℃ before the tapping, guarantee that the steel ingot temperature is even for guaranteeing iron sheet with plate shape.
In the step (5), after steel plate rolls off the production line, need stacking slow cooling 24 hours, form internal fissure to prevent the steel plate internal stress from having little time to discharge.
Test-results shows: the steel plate that adopts method of the present invention to produce has that purity is higher, composition evenly, the characteristics of interior solid, the metallurgical level of steel is higher, mechanical property and surface quality reach and surpass foreign level.
Adopt the assessment of performance through a few cauldron factory of 13MnNiMo5-4 steel plate that method of the present invention produces, its Chemical Composition and mechanical property meet German VdTUV384, the DH-E24-C of Di Lingen steel mill (DIWA353) MAT'L specification and each boiler factory and make the technical requirements of boiler-steam dome with steel plate; The condition of delivery steel plate has good comprehensive mechanical performance and 1/2 good thickness performance and internal soundness, has met or exceeded the quality in kind of state's like product; Have good welding and device fabrication processing characteristics, surface of steel plate and visual appearance satisfy customer requirements; Steel plate heat treatment performance qualification rate reaches 98%, has avoided steel to repeat thermal treatment, has reduced steel plate thermal treatment energy consumption, has improved steel plate and has produced power, has reduced the waste of the steel plate resources of production.The steel plate that method of the present invention is produced has been obtained significant direct economy and has been worth, and has good social benefit, for national station boiler drum has been saved a large amount of foreign exchanges with the import of steel plate materials; Make full use of domestic resource, optimized China's steel products structure, stabilized the import price of external like product.Method of the present invention has shortened the rolling heat-up time of steel, reduces the consumption of producing the energy; Satisfy the repeatedly thermal cycling requirement in the boiler manufacturing processed, its welding property is good.The super-thick steel plate that method of the present invention is produced has been filled up domestic blank, has reached the product level of German Di Lingen steel mill substantially, can be widely used in boiler industry.
Embodiment
Embodiment 1
The actual constituent (by weight percentage) of the steel that method is produced of present embodiment is: C 0.13%, Si0.40%, Mn 1.43%, P 0.008%, S 0.003%, Al 0.030%, Nb 0.012%, V 0.004%, Ni 0.83%, Ceq are 0.43%, roll into the 135mm steel plate.Its mechanical property: yield strength 587MPa, tensile strength: 688MPa, δ 5=21.5%, 0 ℃ of ballistic work AKV (vertically) 184,175,162J, 370 ℃ of high drawing: yield strength 466MPa, tensile strength: 573MPa, δ 5=22.5%.
The production method of present embodiment is as follows: (1) smelts: molten steel is earlier through electrosmelting, send into the refining of LF refining furnace, and feed 300 meters on Al line, bull ladle VD stove vacuum-treat when big bag temperature is 1600 ℃, add SiCa piece 100kg before the vacuum in the molten steel per ton, vacuum tightness 0.5 torr destroys vacuum during 30 minutes vacuum hold-times, solve molten steel and depended merely on the deoxidation of Al line, the higher phenomenon of nonmetallic inclusionsin steel content, guaranteed the purity of steel;
(2) casting: the empty back temperature of destroying of fidelity adopts 31T slab ingot mould to cast at 1545 ℃ then, guarantees that big thickness, big substance steel plate have the enough draught and the raw material of becoming a useful person;
(3) heating: occur bursting for fear of the Hi-Stren steel ingot surface, steel ingot realizes that temperature is sent, Wen Qing, temperature dress, the stove 40 minutes of drying in the air before the dress steel, stewing steel 1 hour; Tiny for guaranteeing the abundant solid solution of alloying element, r crystal grain, adopt low speed to burn steel, below 1000 ℃, heat-up rate is 120 ℃/h, 1260 ℃ of maximum heating temperatures, for guarantee that iron sheet easily removes and the good tapping of plate shape before 15 ℃ of coolings, guarantee that the steel ingot temperature is even;
(4) rolling technology: adopt II type controlled rolling process, the fs is the austenite recrystallization stage, and about 1100 ℃, former passage light reductions roll iron sheet and charge and attack surface of steel ingot repeatedly with high pressure water, with the Ex-all iron sheet; Reduction in pass is 8～25% then, and accumulative total draft 〉=70% makes austenite generation perfect recrystallization, with refine austenite crystal grain; Subordinate phase is the non-recrystallize stage of austenite, 950 ℃ of start rolling temperatures, 920 ℃ of finishing temperatures, in this stage, austenite crystal is elongated, form high-density mechanical twin and deformed belt in the austenite of non-recrystallization in elongation, simultaneously microalloy carbon, nitride are separated out because of deformation induced, thereby have increased ferritic nucleation site, refinement ferrite crystal grain, this stage draft should be tried one's best greatly, accumulative total draft 〉=50%;
(5) water-cooled: the steel plate after rolling carries out online cooling at the ACC quickly cooling device, and returning red temperature is 700 ℃; Stacking slow cooling was 24 hours after steel plate rolled off the production line, and prevented that the steel plate internal stress from having little time to discharge and form internal fissure;
(6) thermal treatment: steel plate is carried out normalizing+temper, and normalizing temperature is 930 ℃, and be 4min/mm total heat-up time, carries out the cooling of entry groove after the normalizing, and it is 200 ℃ that steel plate returns red temperature, and tempering temperature is 680 ℃, and soaking time is 2.8min/mm;
(7) ball blast: through Shot Blasting, thoroughly remove the iron sheet that produces when heating before the steel plate friendship storehouse.
Embodiment 2
The production method of present embodiment is as follows: (1) smelts: molten steel is earlier through electrosmelting, send into the refining of LF refining furnace, and feed 400 meters on Al line, bull ladle VD stove vacuum-treat during 1700 ℃ of big bag temperature, add SiCa piece 95kg before the vacuum in the molten steel per ton, vacuum tightness 0.5 torr destroys vacuum during 40 minutes vacuum hold-times, solve molten steel and depended merely on the deoxidation of Al line, the higher phenomenon of nonmetallic inclusionsin steel content, guaranteed the purity of steel;
(2) casting: the empty back temperature of destroying of fidelity adopts 31T slab ingot mould to cast at 1555 ℃ then, guarantees that big thickness, big substance steel plate have the enough draught and the raw material of becoming a useful person;
(3) heating: occur bursting for fear of the Hi-Stren steel ingot surface, steel ingot realizes that temperature is sent, Wen Qing, temperature dress, the stove 50 minutes of drying in the air before the dress steel, stewing steel 1 hour; Tiny for guaranteeing the abundant solid solution of alloying element, r crystal grain, adopt low speed to burn steel, below 1000 ℃, heat-up rate is 110 ℃/h, 1260 ℃ of maximum heating temperatures; Easily except that well lowering the temperature 20 ℃ before the tapping, guarantee that the steel ingot temperature is even for guaranteeing iron sheet with plate shape
(4) rolling: adopt II type controlled rolling process, the fs is the austenite recrystallization stage, and about 1150 ℃, former passage light reductions roll iron sheet and charge and attack surface of steel ingot repeatedly with high pressure water, with the Ex-all iron sheet; Reduction in pass is 8～25% then, and accumulative total draft 〉=70% makes austenite generation perfect recrystallization, with refine austenite crystal grain; Subordinate phase is the non-recrystallize stage of austenite, 900 ℃ of start rolling temperatures, 880 ℃ of finishing temperatures, in this stage, austenite crystal is elongated, form high-density mechanical twin and deformed belt in the austenite of non-recrystallization in elongation, simultaneously microalloy carbon, nitride are separated out because of deformation induced, thereby have increased ferritic nucleation site, refinement ferrite crystal grain, this stage draft should be tried one's best greatly, accumulative total draft 〉=50%;
(5) water-cooled: the steel plate after rolling carries out online cooling at the ACC quickly cooling device, and returning red temperature is 750 ℃; Stacking slow cooling was 24 hours after steel plate rolled off the production line, and prevented that the steel plate internal stress from having little time to discharge and form internal fissure;
(6) thermal treatment: steel plate is carried out normalizing+temper, and normalizing temperature is 940 ℃, and be 4min/mm total heat-up time, carries out the cooling of entry groove after the normalizing, and steel plate returns 190 ℃ of red temperature, and tempering temperature is 680 ℃, and soaking time is 2.8min/mm;
(7) ball blast: through Shot Blasting, thoroughly remove the iron sheet that produces when heating before the steel plate friendship storehouse.
It should be noted last that: above embodiment is the unrestricted technical scheme of the present invention in order to explanation only, although the present invention is had been described in detail with reference to the foregoing description, those of ordinary skill in the art is to be understood that: still can make amendment or be equal to replacement the present invention, and not breaking away from any modification or partial replacement of the spirit and scope of the present invention, it all should be encompassed in the middle of the claim scope of the present invention.
Claims (6)
1, a kind of production method of large thickness and high intensity steel plate for boiler drum is characterized in that: may further comprise the steps:
(1) smelt: molten steel is sent into the refining of LF refining furnace earlier through electrosmelting, and feeds 300～500 meters on Al line, when wrapping temperature 〉=1600 ℃ greatly, and the vacuum-treat of bull ladle VD stove;
(2) casting: the empty back temperature of destroying of fidelity is at 1545-1555 ℃;
(3) heating: steel ingot realizes that temperature is sent, Wen Qing, temperature dress, dries in the air stove more than 30 minutes before the dress steel, stewing steel 1 hour;
(4) rolling: adopt II type controlled rolling process, the fs is the austenite recrystallization stage, and temperature is 1050-1150 ℃, most of reductions in pass of this stage are 8～25%, accumulative total draft 〉=70% makes austenite generation perfect recrystallization, with refine austenite crystal grain; Subordinate phase is the non-recrystallize stage of austenite, start rolling temperature≤950 ℃, and finishing temperature≤920 ℃, this stage draft should be tried one's best greatly, accumulative total draft 〉=50%;
(5) water-cooled: the steel plate after rolling carries out online cooling, returns red temperature and is 700-750 ℃;
(6) thermal treatment: steel plate is carried out normalizing+temper, and normalizing temperature is 920-940 ℃, and be 4min/mm total heat-up time, carries out the cooling of entry groove after the normalizing, and steel plate returns red temperature≤200 ℃; Tempering temperature is 670-690 ℃, and soaking time is 2.8min/mm;
(7) ball blast: through Shot Blasting, thoroughly remove the iron sheet that produces when heating before the steel plate friendship storehouse.
2, the production method of large thickness and high intensity steel plate for boiler drum according to claim 1, it is characterized in that: the preceding molten steel per ton of vacuum need add SiCa piece 90-110kg in the step (1), vacuum tightness is 0.5 torr, destroys vacuum during vacuum hold-time 〉=25 minute.
3, the production method of large thickness and high intensity steel plate for boiler drum according to claim 1 is characterized in that: the casting in the step (2) adopts 31T slab ingot mould to cast.
4, the production method of large thickness and high intensity steel plate for boiler drum according to claim 1 is characterized in that: step (3) adopts low speed to burn steel, heat-up rate below 1000 ℃≤120 ℃/h, 1260 ℃ of maximum heating temperatures.
5, the production method of large thickness and high intensity steel plate for boiler drum according to claim 1 is characterized in that: step is lowered the temperature before tapping 10-20 ℃ in (3).
6, the production method of large thickness and high intensity steel plate for boiler drum according to claim 1 is characterized in that: in the step (5), needed stacking slow cooling 24 hours after steel plate rolls off the production line.
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| CN101956129A (en) * | 2010-09-23 | 2011-01-26 | 舞阳钢铁有限责任公司 | Large-thickness steel plate for structure part and production method thereof |
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| CN105714062A (en) * | 2014-12-01 | 2016-06-29 | 鞍钢股份有限公司 | Production method of high strength extra-thick boiler steam drum steel plate |
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| CN102181801B (en) * | 2011-04-16 | 2013-05-08 | 舞阳钢铁有限责任公司 | High-weldability fine-grain low-alloy structural steel plate and production method thereof |
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| CN102851473A (en) * | 2012-08-28 | 2013-01-02 | 舞阳钢铁有限责任公司 | Method for producing heavy-gauge SA299 steel plates for boiler drums in power plants |
| CN103834873B (en) * | 2012-11-27 | 2016-06-01 | 宝山钢铁股份有限公司 | A kind of heavy thickness boiler pot cylinder low-alloy high-strength steel plate and manufacture method thereof |
| CN103834873A (en) * | 2012-11-27 | 2014-06-04 | 宝山钢铁股份有限公司 | Low-alloy high-strength steel plate for big-thickness boiler drum and manufacturing method of low-alloy high-strength steel plate |
| CN105714062A (en) * | 2014-12-01 | 2016-06-29 | 鞍钢股份有限公司 | Production method of high strength extra-thick boiler steam drum steel plate |
| CN107661903A (en) * | 2016-07-29 | 2018-02-06 | 本钢板材股份有限公司 | A kind of knobble descaling method |
| CN106834946A (en) * | 2017-02-27 | 2017-06-13 | 江阴兴澄特种钢铁有限公司 | Big thickness protects Testing Tensile Strength at Elevated Temperature steel plate SA299GrB and preparation method thereof |
| CN107326154A (en) * | 2017-06-29 | 2017-11-07 | 舞阳钢铁有限责任公司 | The normalizing heat treatment method of big substance super thick Cr Mo steel plates |
| CN109112400A (en) * | 2018-08-31 | 2019-01-01 | 舞阳钢铁有限责任公司 | A kind of container heat-resisting 12Cr1MoVR steel plate and its production method |
| CN110499458A (en) * | 2019-08-19 | 2019-11-26 | 舞阳钢铁有限责任公司 | The production method of big thickness ultra-wide DIWA353 steel plate |
| CN111074162A (en) * | 2019-11-28 | 2020-04-28 | 舞阳钢铁有限责任公司 | Steel plate for boiler head and production method thereof |
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| CN101451213B (en) | 2010-09-15 |
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