CN101948982A - Steel plate for guide blades of large hydropower generating units and production method thereof - Google Patents

Steel plate for guide blades of large hydropower generating units and production method thereof Download PDF

Info

Publication number
CN101948982A
CN101948982A CN2010102745627A CN201010274562A CN101948982A CN 101948982 A CN101948982 A CN 101948982A CN 2010102745627 A CN2010102745627 A CN 2010102745627A CN 201010274562 A CN201010274562 A CN 201010274562A CN 101948982 A CN101948982 A CN 101948982A
Authority
CN
China
Prior art keywords
steel plate
temperature
rolling
hydropower station
esr
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN2010102745627A
Other languages
Chinese (zh)
Inventor
韦明
刘利香
李红文
赵文忠
吕建会
王全胜
侯彩霞
桑德广
刘丹
王飞
何广霞
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Wuyang Iron and Steel Co Ltd
Hebei Iron and Steel Group Co Ltd
Original Assignee
Wuyang Iron and Steel Co Ltd
Hebei Iron and Steel Group Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Wuyang Iron and Steel Co Ltd, Hebei Iron and Steel Group Co Ltd filed Critical Wuyang Iron and Steel Co Ltd
Priority to CN2010102745627A priority Critical patent/CN101948982A/en
Publication of CN101948982A publication Critical patent/CN101948982A/en
Pending legal-status Critical Current

Links

Abstract

The invention discloses a steel plate for guide blades of large hydropower generating units, which is smelted by the following components by weight: 0.18-0.21% of C, 0.60-0.80% of Si, 1.10-1.25% of Mn, not more than 0.020% of P, not more than 0.005% of S, not more than 0.15% of Cu, 0.020-0.050% of Alt and the balance Fe and inevitable impurities. The steel plate has the following advantages: (1) the steel plate has good strength and toughness matching, yield strength not less than 275MPa, Rm not less than 490MPa, 0-DEG C longitudinal impact energy not less than 27J, A50 not less than 14%, psi not less than 30% and HB not less than 145; (2) the steel plate is purer and has P not more than 0.020% and S not more than 0.005%; (3) the steel plate has denser internal quality and can meet the requirement of the JB/T1271-2002 forging detection standard; and (4) the maximum thickness of the steel plate can reach 226mm.

Description

A kind of Large Hydropower Station stator steel plate and production method thereof
Technical field
The present invention relates to a kind of Large Hydropower Station stator steel plate, relate to a kind of production method of this steel plate simultaneously.
Background technology
The Large Hydropower Station stator with big thickness to roll for the forged steel plate thickness at 186 ~ 226mm, be mainly used in Hydropower Unit fixed guide vane and holder mouthful lower disc member manufacturing, require its internal soundness height, have certain thickness, but also require this type of steel plate to have wear resisting property preferably, could satisfy engineering demand.Large Hydropower Station stator commonly used at present adopts 20MnSi with steel plate, and the at present domestic main dependence of this steel plate is forged and produced, and cost is higher, and the duration is longer, can not satisfy allegro needs.
Summary of the invention
The purpose of this invention is to provide that a kind of compactness is good, wear resistance is good and the Large Hydropower Station stator steel plate of excellent cold-workability exhibiting.
In order to realize above purpose, Large Hydropower Station stator of the present invention with the technical scheme that steel plate adopted is: a kind of Large Hydropower Station stator steel plate, be to form: C:0.18-0.21%, Si:0.60-0.80%, Mn:1.10-1.25% by following components in weight percentage melting, P≤0.020%, S≤0.005%,, Cu≤0.15%, Alt:0.020-0.050%, surplus is Fe and unavoidable impurities.
The thickness of described steel plate is 186-226mm.
The present invention also aims to provide a kind of, to realize steel plate excellent cold-workability exhibiting, anti-lamellar tearing performance, compactness and the purpose that wear resistance is good, intensity is high with the rolling production method that substitutes forged Hydropower Unit stator with steel plate.
Large Hydropower Station stator of the present invention with the technical scheme that production method adopted of steel plate is: a kind of Large Hydropower Station stator production method of steel plate, and the thickness of described steel plate is 186-226mm, the step of this method is as follows:
(1) smelts: molten steel is first through electrosmelting, send into the refining of LF stove and adjust composition, each element comprises following weight percent: C:0.18-0.21%, Si:0.60-0.80%, Mn:1.10-1.25%, P≤0.020%, S≤0.005%, Cu≤0.15%, Alt:0.020-0.050%, when liquid steel temperature reaches 1560-1580 ℃, change vacuum degassing furnace (VD stove) vacuum-treat over to;
(2) casting: the molten steel after will smelting is cast, and obtains strand;
(3) esr: the good strand of will casting is made resmelting electrode according to the setting size and is adopted electroslag furnace to carry out esr, removes the casting billet surface iron scale before the remelting, adds the Al grain during remelting; Obtain ESR ingot behind the esr;
(4) ESR ingot cleaning: with the cleaning of the electroslag spindle band temperature behind the esr, the cleaning temperature is not less than 150 ℃; Shove charge in time of cleaning back or stacking slow cooling are handled;
(5) heating: with the stewing steel of the ESR ingot shove charge after the step 4) processing, adopt low speed to burn steel then, heat-up rate 100-120 below 1000 ℃ ℃/h, 1240 ± 10 ℃ of maximum heating temperatures are incubated 300-500min then;
(6) rolling: the ESR ingot after will heating is rolled, and the fs is the austenite recrystallization stage, and rolling temperature is 950-1150 ℃, is rolling to be thicker than final steel plate thickness 80-100 millimeter; Subordinate phase is the non-recrystallize stage of austenite, and rolling temperature is 820-900 ℃, is rolling to target thickness, obtains the work in-process steel plate;
(7) water-cooled: the work in-process steel plate is carried out water-cooled, and returning red temperature is 680-720 ℃;
(8) expanding hydrogen handles: the work in-process steel plate is inserted burial pit expand the hydrogen processing, wherein the surface of steel plate temperature is not less than 400 ℃; Steel plate expands the hydrogen treatment temp in burial pit be 630 ± 10 ℃, guarantees not 45-50 ℃/h of warming and cooling rate; The steel plate soaking time is not less than 72h; The steel plate tapping temperature is not higher than 300 ℃;
(9) UT (Ultrasonic Testing): the work in-process behind the expansion hydrogen are carried out UT (Ultrasonic Testing);
(10) normalizing process: the work in-process steel plate after the flaw detection is carried out normalizing, 910 ± 10 ℃ of normalizing temperatures, soaking time 2min/mm+(70-110min), water-cooled is quickened cooling after the normalizing, obtains Large Hydropower Station stator steel plate.
Add Al line and CaSi piece before the described vacuum-treat of step 1).
Continuous casting production is adopted in described casting, and superheating temperature is 15-30 ℃, and throwing speed is 1.10-1.30 m/min.
In the described esr of step 3), adopt five yuan of slag system (CaO-MgO-Al 2O 3-SiO 2-CaF 2) carrying out esr, on average molten speed control is built in 24 ± 3kg/min, and per minute adds Al grain 28-32g, adopts air-cooled acceleration cooling, and the crystallizer of electroslag furnace comprises 640mm, 760mm, three kinds of specifications sections of 960mm.
During the described expansion hydrogen of step 8) is handled, guarantee that the electroslag steel plate in time goes into burial pit, the total time inside furnace of steel plate was not less than 150 hours.
Step 5) described rolling in, the start rolling temperature 1080-1150 of fs ℃, finishing temperature 950-980 ℃; The start rolling temperature 880-900 of subordinate phase ℃, finishing temperature 820-850 ℃.
The draft of single pass was 8-15% during the described subordinate phase of step 6) was rolling.
Large Hydropower Station stator of the present invention is with in the component of steel plate: main and other elements formation carbide of C, play build up and precipitation strength, and armor plate strength is increased; Si as reductive agent and reductor, surpasses at 0.5% o'clock in steelmaking process, bigger to the intensity and the wear resistance contribution of steel plate; Mn mainly plays solution strengthening and reduces transformation temperature, the effect that improves armor plate strength; Al in steelmaking process as reductor, simultaneously can crystal grain thinning, improve the intensity and the hardness of steel plate; Cu has certain contribution to erosion resistance, the weathering resistance of steel plate, but also can cause the blue shortness phenomenon of steel, promptly carries out ceiling restriction as impurity element herein, prevents the generation of blue shortness phenomenon; Impurity element P, S equal size roll off the production line and do not limit, and reduce as far as possible under the processing unit ability, and steel is pure to reach, the even purpose of mechanical property.
The chemical composition design of steel plate of the present invention adopts the low-carbon-equivalent ferritic steel, be by the design of low-carbon-equivalent composition and controlled rolling and controlled cooling+normalizing production technique, produce and meet the thick Large Hydropower Station stator of 186-226mm steel plate, be applied to Hydropower Unit fixed guide vane and holder mouthful lower disc member manufacturing, have high strength, cold working and good welding performance, characteristics such as wear resisting property and compactness height, satisfy the requirements such as welding at the on-the-spot crucial stressed place of Hydropower Unit, its manufacturing cycle is lacked, can be realized producing in batches.
After the thick Large Hydropower Station stator of 186-226mm of the present invention expanded the grain refining of hydrogen processing and normalizing fully with the steel plate process, the obdurability index of steel plate obviously was better than hot rolled work in-process steel plate; In addition owing to adopt two step controlled rolling process, be divided into two stages to be rolled respectively, solve the mill milling insufficient pressure and the thick inequality of crystal grain, the impelling strength that cause lower phenomenon, and increased the thickness specification that can produce steel plate.
The present invention has the following advantages: (1) obdurability coupling is good, yield strength Re 〉=275Mpa, Rm 〉=490 Mpa, 0 ℃ of impact of collision merit 〉=27J, A50 〉=14%, ψ 〉=30%, HB 〉=145; (2) steel of the present invention is purer, P≤0.020%, S≤0.005%; (3) internal soundness is finer and close, can satisfy the requirement of JB/T1271-2002 forging non-destructive testing standard; (4) the steel plate maximum ga(u)ge can reach 226mm.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 satisfies the standard-required of large-scale hydroelectric facility unit to the thick 20MnSi of 186-226mm fully, is suitable for making large-scale hydroelectric facility set structure spare.
Embodiment
Embodiment 1
The Large Hydropower Station stator steel plate of present embodiment is to be formed by following components in weight percentage melting: C:0.18%, Si:0.65%, Mn:1.30%, P:0.012%, S:0.003%, the total aluminium of Alt(): 0.020%, Cu:0.12%, all the other are Fe and unavoidable impurities.The steel plate thickness of present embodiment is 202mm.
Large Hydropower Station stator of the present invention is as follows with the step of the production method of steel plate:
(1) smelts: molten steel is first through electrosmelting, molten steel 100-110 ton in the stove is sent into the refining of LF stove and is adjusted composition, and each element comprises following weight percent: C:0.18%, Si:0.65%, Mn:1.30%, P:0.012%, S:0.003%, Alt:0.020%, when Cu:0.12%, liquid steel temperature reach 1565 ℃, change vacuum degassing furnace (VD stove) vacuum-treat over to; Add Al line 230m, CaSi piece 120kg before the vacuum, vacuum tightness is not more than 66Pa, destroys vacuum during 20 minutes vacuum hold-times;
(2) casting: the molten steel after will smelting is cast, and adopts continuous casting production, and superheating temperature is 15 ℃, and throwing speed is 1.15m/min, and guarantees suitable secondary cooling water coupling, obtains strand.
(3) esr: the good strand of will casting is made resmelting electrode in electroslag furnace according to setting size, removes the casting billet surface iron scale before the remelting; Adopt five yuan of slag system (CaO-MgO-Al 2O 3-SiO 2-CaF 2), adding the Al grain during remelting, adding speed is 28g/min; Select the 760mm water mold to carry out esr, on average molten speed control adopts air-cooled acceleration cooling built in about 24kg/min;
(4) ESR ingot cleaning: send steel rolling with the ESR ingot heat after the remelting, the cleaning of band temperature, surface temperature is 420 ℃ during cleaning;
(5) heating: steel 60min is boiled in a covered pot over a slow fire in the timely shove charge of the ESR ingot after will clearing up, and adopts low speed to burn steel, and heat-up rate below 1000 ℃ is controlled at 100 ℃/h, and 1240 ℃ of maximum heating temperatures are incubated 300min then;
(6) rolling technology: the fs start rolling temperature is 1150 ℃, 980 ℃ of finishing temperatures, and being rolling to steel plate thickness is 302mm; 900 ℃ of the start rolling temperatures of subordinate phase, 840 ℃ of finishing temperatures are rolling to target thickness, and the single pass draft is 8 ~ 10%, obtains the work in-process steel plate after rolling;
(7) water-cooled: the work in-process steel plate after rolling cools off fast by ACC, and returning red temperature is 680 ℃;
(8) expanding hydrogen handles: the work in-process steel plate is inserted burial pit expand the hydrogen processing, wherein the surface of steel plate temperature is 460 ℃; Steel plate expands 630 ℃ of hydrogen treatment temps in burial pit, 45 ℃/h of warming and cooling rate; The steel plate soaking time is 72h; The steel plate tapping temperature is not higher than 300 ℃, and the total time inside furnace of steel plate is 150 hours;
(9) UT (Ultrasonic Testing): it is qualified that the work in-process steel plate behind the expansion hydrogen is detected a flaw according to JB/T4730-2005 I level, to the square area of the difference reconditioning 500mm * 500mm of steel plate head and tail width 1/2 place, qualified simultaneously according to the flaw detection of JB/T1271-2002 forging standard;
(10) normalizing: the work in-process steel plate is carried out normalizing treatment, 910 ℃ of normalizing temperatures, every millimeter steel plate of soaking time 1.5min/mm()+and 90min, water-cooled is quickened cooling after the normalizing.
The Large Hydropower Station stator of present embodiment is as follows to roll for the performance of forged steel plate with big thickness: Ceq is 0.40%, rolls into the 202mm steel plate.Its mechanical property: yield strength 320MPa, tensile strength 535MPa, unit elongation A=20%, 0 ℃ of ballistic work AKV(is vertical) 208J, 223J, 185J, ψ=58%, HB=180.
Embodiment 2
The Large Hydropower Station stator steel plate of present embodiment is to be formed by following components in weight percentage melting: C:0.16%, Si:0.60%, Mn:1.25%, P:0.010%, S:0.003%, the total aluminium of Alt(): 0.028%, all the other are Fe and unavoidable impurities.The steel plate thickness of present embodiment is 226mm.
Large Hydropower Station stator of the present invention is as follows to roll for the production method of forged steel plate with big thickness:
(1) smelts: molten steel is first through electrosmelting, molten steel 100-110 ton in the stove, send into the refining of LF stove and adjust composition, each element comprises following weight percent: C:0.16%, Si:0.60%, Mn:1.25%, P:0.010%, S:0.003%, Alt:0.028%, when liquid steel temperature reaches 1560 ℃, change vacuum degassing furnace (VD stove) vacuum-treat over to; Add Al line 260m, CaSi piece 150kg before the vacuum, vacuum tightness is not more than 66Pa, destroys vacuum during 20 minutes vacuum hold-times;
(2) casting: the molten steel after will smelting is cast, and adopts continuous casting production, and superheating temperature is 25 ℃, and throwing speed is 1.10m/min, and guarantees suitable secondary cooling water coupling, obtains strand.
(3) esr: the good strand of will casting is made resmelting electrode in electroslag furnace according to setting size, removes the casting billet surface iron scale before the remelting; Adopt five yuan of slag system (CaO-MgO-Al 2O 3-SiO 2-CaF 2), adding the Al grain during remelting, adding speed is 30g/min; Select the 960mm water mold to carry out esr, on average molten speed control adopts air-cooled acceleration cooling built in about 27kg/min;
(4) ESR ingot cleaning: send steel rolling with the ESR ingot heat after the remelting, the cleaning of band temperature, surface temperature is 450 ℃ during cleaning;
(5) heating: steel 60min is boiled in a covered pot over a slow fire in the timely shove charge of the ESR ingot after will clearing up, and adopts low speed to burn steel, and heat-up rate below 1000 ℃ is controlled at 110 ℃/h, and 1250 ℃ of maximum heating temperatures are incubated 500min then;
(6) rolling technology: the fs start rolling temperature is 1100 ℃, 970 ℃ of finishing temperatures, and being rolling to steel plate thickness is 316mm; 890 ℃ of the start rolling temperatures of subordinate phase, 850 ℃ of finishing temperatures are rolling to target thickness, and the single pass draft is 10-12%, obtains the work in-process steel plate after rolling;
(7) water-cooled: the work in-process steel plate after rolling cools off fast by ACC, and returning red temperature is 700 ℃;
(8) expanding hydrogen handles: the work in-process steel plate is inserted burial pit expand the hydrogen processing, wherein the surface of steel plate temperature is 415 ℃; Steel plate expands 640 ℃ of hydrogen treatment temps in burial pit, 47 ℃/h of warming and cooling rate; The steel plate soaking time is 75h; The steel plate tapping temperature is not higher than 280 ℃, and the total time inside furnace of steel plate is 158 hours;
(9) UT (Ultrasonic Testing): it is qualified that the work in-process steel plate behind the expansion hydrogen is detected a flaw according to JB/T4730-2005 I level, to the square area of the difference reconditioning 500mm * 500mm of steel plate head and tail width 1/2 place, qualified simultaneously according to the flaw detection of JB/T1271-2002 forging standard;
(10) normalizing: the work in-process steel plate is carried out normalizing treatment, 910 ℃ of normalizing temperatures, every millimeter steel plate of soaking time 2min/mm()+and 110min, water-cooled is quickened cooling after the normalizing.
The Large Hydropower Station stator of present embodiment is as follows to roll for the performance of forged steel plate with big thickness: Ceq is 0.41%, rolls into the 226mm steel plate.Its mechanical property: yield strength 350MPa, tensile strength 550MPa, unit elongation A=19%, 0 ℃ of ballistic work AKV(is vertical) 212J, 243J, 238J, ψ=65%, HB=205.
Embodiment 3
The Large Hydropower Station stator steel plate of present embodiment is to be formed by following components in weight percentage melting: C:0.21%, Si:0.80%, Mn:1.10%, P:0.014%, S:0.003%, the total aluminium of Alt(): 0.050%, Cu:0.15%, all the other are Fe and unavoidable impurities.The steel plate thickness of present embodiment is 216mm.
Large Hydropower Station stator of the present invention is as follows to roll for the production method of forged steel plate with big thickness:
(1) smelts: molten steel is first through electrosmelting, molten steel 100-110 ton in the stove is sent into the refining of LF stove and is adjusted composition, and each element comprises following weight percent: C:0.21%, Si:0.80%, Mn:1.10%, P:0.014%, S:0.003%, Alt:0.050%, when Cu:0.15%, liquid steel temperature reach 1580 ℃, change vacuum degassing furnace (VD stove) vacuum-treat over to; Add Al line 210m, CaSi piece 100kg before the vacuum, vacuum tightness is not more than 66Pa, destroys vacuum during 20 minutes vacuum hold-times;
(2) casting: the molten steel after will smelting is cast, and adopts continuous casting production, and superheating temperature is 23 ℃, and throwing speed is 1.10m/min, and guarantees suitable secondary cooling water coupling, obtains strand.
(3) esr: the good strand of will casting is made resmelting electrode in electroslag furnace according to setting size, removes the casting billet surface iron scale before the remelting; Adopt five yuan of slag system (CaO-MgO-Al 2O 3-SiO 2-CaF 2), adding the Al grain during remelting, adding speed is 32g/min; Select the 760mm water mold to carry out esr, on average molten speed control adopts air-cooled acceleration cooling built in about 26kg/min;
(4) ESR ingot cleaning: send steel rolling with the ESR ingot heat after the remelting, the cleaning of band temperature, surface temperature is 380 ℃ during cleaning;
(5) heating: steel 60min is boiled in a covered pot over a slow fire in the timely shove charge of the ESR ingot after will clearing up, and adopts low speed to burn steel, and heat-up rate below 1000 ℃ is controlled at 120 ℃/h, and 1230 ℃ of maximum heating temperatures are incubated 380min then;
(6) rolling technology: the fs start rolling temperature is 1140 ℃, 960 ℃ of finishing temperatures, and being rolling to steel plate thickness is 296mm; 900 ℃ of the start rolling temperatures of subordinate phase, 845 ℃ of finishing temperatures are rolling to target thickness, and the single pass draft is 11-13%, obtains the work in-process steel plate after rolling;
(7) water-cooled: the work in-process steel plate after rolling cools off fast by ACC, and returning red temperature is 695 ℃;
(8) expanding hydrogen handles: the work in-process steel plate is inserted burial pit expand the hydrogen processing, wherein the surface of steel plate temperature is 430 ℃; Steel plate expands 620 ℃ of hydrogen treatment temps in burial pit, 48 ℃/h of warming and cooling rate; The steel plate soaking time is 78h; The steel plate tapping temperature is not higher than 285 ℃, and the total time inside furnace of steel plate is 156 hours;
(9) UT (Ultrasonic Testing): it is qualified that the work in-process steel plate behind the expansion hydrogen is detected a flaw according to JB/T4730-2005 I level, to the square area of the difference reconditioning 500mm * 500mm of steel plate head and tail width 1/2 place, qualified simultaneously according to the flaw detection of JB/T1271-2002 forging standard;
(10) normalizing: the work in-process steel plate is carried out normalizing treatment, 900 ℃ of normalizing temperatures, every millimeter steel plate of soaking time 2.2min/mm()+and 90min, water-cooled is quickened cooling after the normalizing.
The Large Hydropower Station stator of present embodiment is as follows to roll for the performance of forged steel plate with big thickness: Ceq is 0.41%, rolls into the 226mm steel plate.Its mechanical property: yield strength 320MPa, tensile strength 535MPa, unit elongation A=19%, 0 ℃ of ballistic work AKV(is vertical) 212J, 243J, 238J, ψ=65%, HB=195.
Embodiment 4
The Large Hydropower Station stator steel plate of present embodiment is to be prepared from by following components in weight percentage: C:0.19%, Si:0.72%, Mn:1.00%, P:0.010%, S:0.003%, the total aluminium of Alt(): 0.039%, Cu:0.10%, all the other are Fe and unavoidable impurities.The steel plate thickness of present embodiment is 186mm.
Large Hydropower Station stator of the present invention is as follows to roll for the production method of forged steel plate with big thickness:
(1) smelts: molten steel is first through electrosmelting, molten steel 100-110 ton in the stove is sent into the refining of LF stove and is adjusted composition, and each element comprises following weight percent: C:0.22%, Si:0.72%, Mn:1.00%, P:0.010%, S:0.003%, Alt:0.039%, when Cu:0.10%, liquid steel temperature reach 1570 ℃, change vacuum degassing furnace (VD stove) vacuum-treat over to; Add Al line 160m, CaSi piece 150kg before the vacuum, vacuum tightness is not more than 66Pa, destroys vacuum during 20 minutes vacuum hold-times;
(2) casting: the molten steel after will smelting is cast, and adopts continuous casting production, and superheating temperature is 30 ℃, and throwing speed is 1.30m/min, and guarantees suitable secondary cooling water coupling, obtains strand.
(3) esr: the good strand of will casting is made resmelting electrode in electroslag furnace according to setting size, removes the casting billet surface iron scale before the remelting; Adopt five yuan of slag system (CaO-MgO-Al 2O 3-SiO 2-CaF 2), adding the Al grain during remelting, adding speed is 29g/min; Select the 640mm water mold to carry out esr, on average molten speed control adopts air-cooled acceleration cooling built in about 21kg/min;
(4) ESR ingot cleaning: send steel rolling with the ESR ingot heat after the remelting, the cleaning of band temperature, surface temperature is 430 ℃ during cleaning;
(5) heating: steel 60min is boiled in a covered pot over a slow fire in the timely shove charge of the ESR ingot after will clearing up, and adopts low speed to burn steel, and heat-up rate below 1000 ℃ is controlled at 120 ℃/h, and 1230 ℃ of maximum heating temperatures are incubated 400min then;
(6) rolling technology: the fs start rolling temperature is 1080 ℃, 950 ℃ of finishing temperatures, and being rolling to steel plate thickness is 286mm; 880 ℃ of the start rolling temperatures of subordinate phase, 820 ℃ of finishing temperatures are rolling to target thickness, and the single pass draft is 13-15%, obtains the work in-process steel plate after rolling;
(7) water-cooled: the work in-process steel plate after rolling cools off fast by ACC, and returning red temperature is 710 ℃;
(8) expanding hydrogen handles: the work in-process steel plate is inserted burial pit expand the hydrogen processing, wherein the surface of steel plate temperature is 475 ℃; Steel plate expands 620 ℃ of hydrogen treatment temps in burial pit, 50 ℃/h of warming and cooling rate; The steel plate soaking time is 76h; The steel plate tapping temperature is not higher than 270 ℃, and the total time inside furnace of steel plate is 152 hours;
(9) UT (Ultrasonic Testing): it is qualified that the work in-process steel plate behind the expansion hydrogen is detected a flaw according to JB/T4730-2005 I level, to the square area of the difference reconditioning 500mm * 500mm of steel plate head and tail width 1/2 place, qualified simultaneously according to the flaw detection of JB/T1271-2002 forging standard;
(10) normalizing: the work in-process steel plate is carried out normalizing treatment, 920 ℃ of normalizing temperatures, every millimeter steel plate of soaking time 2.5min/mm()+and 90min, water-cooled is quickened cooling after the normalizing.
The Large Hydropower Station stator of present embodiment is as follows to roll for the performance of forged steel plate with big thickness: Ceq is 0.40%, rolls into the 186mm steel plate.Its mechanical property: yield strength 345MPa, tensile strength 560MPa, unit elongation A=21%, 0 ℃ of ballistic work AKV(is vertical) 228J, 245J, 236J, ψ=62%, HB=205.
Steel plate among the foregoing description 1-4 is carried out weldability test, the welding down of conventional welding heat input normal temperature, heat affected zone and close position, heat affected zone hardness are 155-180HB; These steel are when the wlding coupling of selecting for use, and welding steel does not all need preheating under the normal temperature, does not produce welding crack, and does not need to heat-treat after the welding.

Claims (9)

1. Large Hydropower Station stator steel plate, it is characterized in that: be to form: C:0.18-0.21% by following components in weight percentage melting, Si:0.60-0.80%, Mn:1.10-1.25%, P≤0.020%, S≤0.005%, Cu≤0.15%, Alt:0.020-0.050%, surplus is Fe and unavoidable impurities.
2. Large Hydropower Station stator steel plate according to claim 1 is characterized in that: the thickness of described steel plate is 186-226mm.
3. a Large Hydropower Station stator is with the production method of steel plate, and it is characterized in that: the thickness of described steel plate is 186-226mm, and the step of this method is as follows:
(1) smelts: molten steel is first through electrosmelting, send into the refining of LF stove and adjust composition, each element comprises following weight percent: C:0.18-0.21%, Si:0.60-0.80%, Mn:1.10-1.25%, P≤0.020%, S≤0.005%, Cu≤0.15%, Alt:0.020-0.050%, when liquid steel temperature reaches 1560-1580 ℃, change vacuum degassing furnace (VD stove) vacuum-treat over to;
(2) casting: the molten steel after will smelting is cast, and obtains strand;
(3) esr: the good strand of will casting is made resmelting electrode according to the setting size and is adopted electroslag furnace to carry out esr, removes the casting billet surface iron scale before the remelting, adds the Al grain during remelting; Obtain ESR ingot behind the esr;
(4) ESR ingot cleaning: with the cleaning of the electroslag spindle band temperature behind the esr, the cleaning temperature is not less than 150 ℃; Shove charge in time of cleaning back or stacking slow cooling are handled;
(5) heating: with the stewing steel of the ESR ingot shove charge after the step 4) processing, adopt low speed to burn steel then, heat-up rate 100-120 below 1000 ℃ ℃/h, 1240 ± 10 ℃ of maximum heating temperatures are incubated 300-500min then;
(6) rolling: the ESR ingot after will heating is rolled, and the fs is the austenite recrystallization stage, and rolling temperature is 950-1150 ℃, is rolling to be thicker than final steel plate thickness 80-100 millimeter; Subordinate phase is the non-recrystallize stage of austenite, and rolling temperature is 820-900 ℃, is rolling to target thickness, obtains the work in-process steel plate;
(7) water-cooled: the work in-process steel plate is carried out water-cooled, and returning red temperature is 680-720 ℃;
(8) expanding hydrogen handles: the work in-process steel plate is inserted burial pit expand the hydrogen processing, wherein the surface of steel plate temperature is not less than 400 ℃; Steel plate expands the hydrogen treatment temp in burial pit be 630 ± 10 ℃, guarantees not 45-50 ℃/h of warming and cooling rate; The steel plate soaking time is not less than 72h; The steel plate tapping temperature is not higher than 300 ℃;
(9) UT (Ultrasonic Testing): the work in-process behind the expansion hydrogen are carried out UT (Ultrasonic Testing);
(10) normalizing process: the work in-process steel plate after the flaw detection is carried out normalizing, 910 ± 10 ℃ of normalizing temperatures, soaking time 2min/mm+(70-110min), water-cooled is quickened cooling after the normalizing, obtains Large Hydropower Station stator steel plate.
4. Large Hydropower Station stator according to claim 3 is characterized in that: add Al line and CaSi piece before the described vacuum-treat of step 1) with the production method of steel plate.
5. the Large Hydropower Station stator according to claim 3 production method of steel plate is characterized in that: continuous casting production is adopted in described casting, and superheating temperature is 15-30 ℃, and throwing speed is 1.10-1.30 m/min.
6. Large Hydropower Station stator according to claim 3 is characterized in that: in the described esr of step 3), adopt five yuan of slag system (CaO-MgO-Al with the production method of steel plate 2O 3-SiO 2-CaF 2) carrying out esr, on average molten speed control is built in 24 ± 3kg/min, and per minute adds Al grain 28-32g, adopts air-cooled acceleration cooling, and the crystallizer of electroslag furnace comprises 640mm, 760mm, three kinds of specifications sections of 960mm.
7. Large Hydropower Station stator according to claim 3 is characterized in that with the production method of steel plate: during the described expansion hydrogen of step 8) is handled, guarantee that the electroslag steel plate in time goes into burial pit, the total time inside furnace of steel plate was not less than 150 hours.
8. Large Hydropower Station stator according to claim 3 is characterized in that with the production method of steel plate: step 5) described rolling in, the start rolling temperature 1080-1150 of fs ℃, finishing temperature 950-980 ℃; The start rolling temperature 880-900 of subordinate phase ℃, finishing temperature 820-850 ℃.
9. the Large Hydropower Station stator according to claim 3 production method of steel plate is characterized in that: the draft of single pass was 8-15% during the described subordinate phase of step 6) was rolling.
CN2010102745627A 2010-09-07 2010-09-07 Steel plate for guide blades of large hydropower generating units and production method thereof Pending CN101948982A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN2010102745627A CN101948982A (en) 2010-09-07 2010-09-07 Steel plate for guide blades of large hydropower generating units and production method thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN2010102745627A CN101948982A (en) 2010-09-07 2010-09-07 Steel plate for guide blades of large hydropower generating units and production method thereof

Publications (1)

Publication Number Publication Date
CN101948982A true CN101948982A (en) 2011-01-19

Family

ID=43452605

Family Applications (1)

Application Number Title Priority Date Filing Date
CN2010102745627A Pending CN101948982A (en) 2010-09-07 2010-09-07 Steel plate for guide blades of large hydropower generating units and production method thereof

Country Status (1)

Country Link
CN (1) CN101948982A (en)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102912221A (en) * 2012-10-12 2013-02-06 舞阳钢铁有限责任公司 Large-thickness structural steel plate for high-rise building and production method thereof
CN103451530A (en) * 2013-08-29 2013-12-18 舞阳钢铁有限责任公司 Hydroelectric normalized high strength steel sheet with great thickness and easy to weld and production method thereof
CN103451562A (en) * 2013-08-29 2013-12-18 舞阳钢铁有限责任公司 Quenched large-thickness easy-to-weld Z-direction high-strength steel plate for water and electricity and production method thereof
CN103725855A (en) * 2013-12-26 2014-04-16 南阳汉冶特钢有限公司 Efficient hydrogen diffusing technology for producing extra-thick steel plate
CN104120349A (en) * 2014-07-23 2014-10-29 舞阳钢铁有限责任公司 F-grade large-thickness weldable steel plate with high pureness and high low-temperature toughness and production method thereof
CN105792982A (en) * 2013-12-06 2016-07-20 Posco公司 Welding joint having remarkable impact resistance and abrasion resistance
CN107022723A (en) * 2017-03-21 2017-08-08 舞阳钢铁有限责任公司 The big big substance 12Cr2Mo1VR steel plates of specification and its production method
CN107363124A (en) * 2017-08-25 2017-11-21 攀钢集团研究院有限公司 The manufacture method of Aero-Space seamless steel pipe
CN110093485A (en) * 2019-04-09 2019-08-06 舞阳钢铁有限责任公司 A method of using the special thick end socket steel plate of ESR ingot production high-quality
CN112251664A (en) * 2020-09-28 2021-01-22 无锡市法兰锻造有限公司 Ultra-fine grain alloy steel forging and manufacturing method thereof

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101270437A (en) * 2007-03-19 2008-09-24 株式会社神户制钢所 High-tension steel with excellent weldability and plastic deformation ability
CN101368251A (en) * 2008-09-28 2009-02-18 舞阳钢铁有限责任公司 Steel plate for large-thickness hydrogen-contacting equipment and its production technology
CN101451214A (en) * 2007-12-04 2009-06-10 舞阳钢铁有限责任公司 Large thickness novel anti-hydrogen sulfide steel and method for producing the same
CN101713054A (en) * 2009-12-28 2010-05-26 舞阳钢铁有限责任公司 Large thickness steel plate for hydrogenation reaction chamber reeling equipment and production method thereof
CN101713051A (en) * 2009-12-28 2010-05-26 舞阳钢铁有限责任公司 Hydrogen steel plate with thickness of 100mm and preparation method thereof
CN101724783A (en) * 2009-12-25 2010-06-09 舞阳钢铁有限责任公司 Heat resisting type alloy structure steel plate and method for producing same

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101270437A (en) * 2007-03-19 2008-09-24 株式会社神户制钢所 High-tension steel with excellent weldability and plastic deformation ability
CN101451214A (en) * 2007-12-04 2009-06-10 舞阳钢铁有限责任公司 Large thickness novel anti-hydrogen sulfide steel and method for producing the same
CN101368251A (en) * 2008-09-28 2009-02-18 舞阳钢铁有限责任公司 Steel plate for large-thickness hydrogen-contacting equipment and its production technology
CN101724783A (en) * 2009-12-25 2010-06-09 舞阳钢铁有限责任公司 Heat resisting type alloy structure steel plate and method for producing same
CN101713054A (en) * 2009-12-28 2010-05-26 舞阳钢铁有限责任公司 Large thickness steel plate for hydrogenation reaction chamber reeling equipment and production method thereof
CN101713051A (en) * 2009-12-28 2010-05-26 舞阳钢铁有限责任公司 Hydrogen steel plate with thickness of 100mm and preparation method thereof

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
《钢铁》 20070831 常跃峰等 低合金高强度宽厚钢板的发展趋势 1-6 1-9 第42卷, 第8期 2 *

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102912221A (en) * 2012-10-12 2013-02-06 舞阳钢铁有限责任公司 Large-thickness structural steel plate for high-rise building and production method thereof
CN103451530B (en) * 2013-08-29 2016-02-10 舞阳钢铁有限责任公司 A kind of water power normalizing type heavy thickness easily welded high-strength steel plate and production method thereof
CN103451530A (en) * 2013-08-29 2013-12-18 舞阳钢铁有限责任公司 Hydroelectric normalized high strength steel sheet with great thickness and easy to weld and production method thereof
CN103451562A (en) * 2013-08-29 2013-12-18 舞阳钢铁有限责任公司 Quenched large-thickness easy-to-weld Z-direction high-strength steel plate for water and electricity and production method thereof
CN103451562B (en) * 2013-08-29 2015-09-23 舞阳钢铁有限责任公司 Water power quenching and tempering type heavy thickness easily welds Z-direction high tensile steel plate and production method thereof
CN105792982A (en) * 2013-12-06 2016-07-20 Posco公司 Welding joint having remarkable impact resistance and abrasion resistance
CN103725855A (en) * 2013-12-26 2014-04-16 南阳汉冶特钢有限公司 Efficient hydrogen diffusing technology for producing extra-thick steel plate
CN104120349A (en) * 2014-07-23 2014-10-29 舞阳钢铁有限责任公司 F-grade large-thickness weldable steel plate with high pureness and high low-temperature toughness and production method thereof
CN107022723A (en) * 2017-03-21 2017-08-08 舞阳钢铁有限责任公司 The big big substance 12Cr2Mo1VR steel plates of specification and its production method
CN107363124A (en) * 2017-08-25 2017-11-21 攀钢集团研究院有限公司 The manufacture method of Aero-Space seamless steel pipe
CN107363124B (en) * 2017-08-25 2019-02-15 攀钢集团研究院有限公司 The manufacturing method of aerospace seamless steel pipe
CN110093485A (en) * 2019-04-09 2019-08-06 舞阳钢铁有限责任公司 A method of using the special thick end socket steel plate of ESR ingot production high-quality
CN112251664A (en) * 2020-09-28 2021-01-22 无锡市法兰锻造有限公司 Ultra-fine grain alloy steel forging and manufacturing method thereof

Similar Documents

Publication Publication Date Title
CN101948984B (en) Steel plate for heavy-duty generator and manufacturing method thereof
CN101948982A (en) Steel plate for guide blades of large hydropower generating units and production method thereof
CN103451562B (en) Water power quenching and tempering type heavy thickness easily welds Z-direction high tensile steel plate and production method thereof
CN102912221B (en) Large-thickness structural steel plate for high-rise building and production method thereof
CN101967597B (en) Method for producing high-thickness Z-direction steel plate
CN101956130B (en) Large-thickness rolled steel plate instead of case one for large-sized ball mill and production method thereof
CN101709425B (en) High-strength steel plate for super-thick 80,000-ton large-scale forging press brackets, and production method thereof
CN103451530B (en) A kind of water power normalizing type heavy thickness easily welded high-strength steel plate and production method thereof
CN102766748B (en) Production method of low-temperature steel plate capable of being welded by high heat input
CN103695803B (en) The heavy thickness rack steel that low-carbon-equivalent low-temperature uses and manufacture method thereof
CN104561772B (en) A kind of 130mm~150mm thickness ultralow temperature steel plate and its production method
CN103540838A (en) Steel plate for low-temperature vessel and production method thereof
CN105908086B (en) A kind of special thick low-alloy steel plate of low compression ratio and its manufacture method
CN102676920B (en) Large-thickness steel plate for low-temperature pressure container and production method thereof
CN102851578A (en) Steel plate with super-large thickness for nuclear power engineering equipment and production method thereof
CN103725986A (en) High-ductility Class F extra thick rack steel plate used at low temperature and manufacturing method of steel plate
CN102433503A (en) Wind power flange alloy steel and preparation technology of parts thereof
CN102304668B (en) Preparation method of high performance ultra-thick steel plate
CN102851609A (en) Material used in offshore wind power equipment, and workpiece manufacturing process
CN103305768A (en) Steel for low-carbon equivalent seawater corrosion resisting ocean platform rack and production method of steel
CN102345066B (en) Steel used for pressure container and preparation method thereof
CN102876997B (en) Easy-welding tempering high-strength steel plate for ocean platform and production method thereof
CN102061426B (en) 400-420mm large-thickness low-alloy high-strength constructional steel and production method thereof
CN104674130A (en) Method for producing large-thickness lamination-crack-resistant tempered high-strength steel plate
CN102796952A (en) High-thickness steel plate for ocean platform and production method for steel plate

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
C12 Rejection of a patent application after its publication
RJ01 Rejection of invention patent application after publication

Application publication date: 20110119