CN103451530B - A kind of water power normalizing type heavy thickness easily welded high-strength steel plate and production method thereof - Google Patents
A kind of water power normalizing type heavy thickness easily welded high-strength steel plate and production method thereof Download PDFInfo
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Abstract
The present invention relates to a kind of water power normalizing type heavy thickness easily welded high-strength steel plate and production method thereof, belong to smelting iron and steel Technology field.Technical scheme be comprise smelting, continuous casting, esr, heating, rolling, roll rear water-cooled, thermal reactor buttress, heat treatment step, formed by the component melting of following mass percent, C:0.10%-0.18%, Si:0.15%-0.35%, Mn:0.90%-1.60%, P≤0.02%, S≤0.005%, Nb:0.020%-0.030%, Al:0.010%-0.080%, V:0.035%-0.065%, Ti≤0.025%, surplus is Fe and inevitable impurity.The present invention has the following advantages: under guaranteeing that steel plate has good comprehensive mechanical property and welding property, reduce the cost, enhance one's market competitiveness; Do you meet GB/T 2970
Description
Technical field
The present invention relates to a kind of water power normalizing type heavy thickness easily welded high-strength steel plate and production method thereof, belong to smelting iron and steel Technology field.
Background technology
At present, the maximum turbine-generator units of external rated output is 700MW, the 700MW that China has put into operation and above turbine-generator units reach nearly 50, estimate to also have 35 rated output be 700MW and above turbine-generator units will before 2015 power generation, wherein maximum rated power is 8 800MW turbine-generator units of Xiangjiabahydropower project and 18 770MW turbine-generator units in small stream Luo Du power station.The application of huge water wheel generator group relates to unit and support equipment manufacture, unit capacity and operating head polishing are all higher than Three Gorges unit, hydroelectric machine seat ring upper and lower ring flat-plate 350mm heavy thickness water-power steel S355 level steel plate requires higher to metallic substance quality and performance, particularly the mechanical property of steel, welding property and Z-direction performance etc. are had higher requirement, exceed the steel plate scope used of existing turbine-generator units, and common smelting casting means cannot be satisfied the demand, especially in internal soundness, do not reach requirement; How can organization of production fine and close, steel is clean, performance is even, can meet the water power heavy thickness easily welded high-strength steel plate of higher flaw detection and performance requriements, is this area technical problem urgently to be resolved hurrily.
Summary of the invention
The object of the invention is to provide a kind of water power normalizing type heavy thickness easily welded high-strength steel plate and production method thereof, improve the thickness of steel plate, internal soundness, welding property, anti-lamellar tearing performance, intensity and low-temperature impact toughness, solve the problems referred to above existed in background technology.
The technical scheme of invention is: a kind of water power heavy thickness easily welded high-strength steel plate, formed by the component melting of following mass percent, C:0.10%-0.18%, Si:0.15%-0.35%, Mn:0.90%-1.60%, P≤0.02%, S≤0.005%, Nb:0.020%-0.030%, Al:0.010%-0.080%, V:0.035%-0.065%, Ti≤0.025%, surplus is Fe and inevitable impurity.
The thickness of described water power heavy thickness easily welded high-strength steel plate is 350mm.
A production method for water power normalizing type heavy thickness easily welded high-strength steel plate, comprise smelting, continuous casting, esr, heating, rolling, roll rear water-cooled, thermal reactor is piled up neatly, heat treatment step, each working procedure parameter is as follows:
1. smelting procedure: will containing following mass percent C:0.10%-0.18%, Si:0.15%-0.35%, Mn:0.90%-1.60%, P≤0.02%, S≤0.005%, Nb:0.020%-0.030%, Al:0.010%-0.080%, V:0.035%-0.065%, the molten steel of Ti≤0.025% component is first through electrosmelting, send into the refining of LF refining furnace, then proceed to VD stove Fruit storage, before VD, add CaSi block or Fe-Ca line change inclusion morphology;
2. continuous casting working procedure: adopt low carbon protective slag, strand rolls off the production line stacking more than 24 hours, the cleaning of band temperature, turns electroslag remelting furnace base;
3. esr operation: electroslag furnace adopts low frequency power supply, bipolar series, lifts crystallizer technique; For guaranteeing plate surface quality, to the cleaning of electroslag spindle band temperature, cleaning temperature > 150 DEG C; If can not shove charge in time after cleaning, answer stacking slow cooling;
4. heating process: maximum heating temperature is 1240 DEG C, soaking temperature is 1100-1200 DEG C, and total heat-up time is 24-30h, soaking time >=5h;
5. rolling process: ESR ingot Heating temperature 1150 DEG C ~ 1180 DEG C, start rolling temperature 1050 DEG C ~ 1100 DEG C, adopt the control device of the large pressure of low speed, percentage pass reduction is to fixing between 8% ~ 10%, the Static Recrystallization time of reserved 3 ~ 5s between passage, finishing temperature when reaching finished product thickness ensures that total reduction reaches 60% more than 980 DEG C, makes the abundant recrystallize of steel plate;
6. roll rear water-cooled operation: be as cold as between 600 DEG C ~ 700 DEG C soon by ACC water-cooled after steel plate rolls, the rapid water of organizing retaining refinement is chilled to 750-850 DEG C;
7. thermal reactor buttress operation: roll rear employing expansion hydrogen technique and expansion hydrogen is carried out to steel plate;
8. heat treatment step: furnace temperature 500-600 DEG C shove charge, is rapidly heated 4 ~ 6 hours, to 950 ± 20 DEG C, improves austenitic nucleation rate, is incubated 1 hour, is then cooled to 910 DEG C, is incubated 5 ~ 10 hours, and when avoiding high temperature long, heating causes Austenite Grain Growth; After steel plate soaking time arrives, hang out immediately and enter water rapid cooling into quenching tank, quenching tank water temperature controls, below 30 DEG C, to hang out air cooling after 5 ~ 10s, avoids overlong time to cause surperficial Widmannstatten structure serious, controls red temperature between 500 DEG C ~ 700 DEG C.
Described smelting procedure, the vacuum tightness≤66.6Pa of Fruit storage, vacuum hold-time >=20min; The add-on of CaSi block or Fe-Ca line is >=100kg/ stove.
Described continuous casting working procedure, pouring temperature is 1540-1560 DEG C.
Described esr operation, crystallizer for electroslag furnace thickness is respectively 640mm, 760mm, 960mm tri-kinds of specifications, adopts the slag system matched with three kinds of specification crystallizers.
The present invention adopts carbon, manganese solution strengthening; Add a small amount of Nb, V crystal grain thinning, its carbonitride plays dispersion-strengthened action; By follow-up rational thermal treatment process, the steel plate of production has large thickness and good performance.Wherein, the effect in the present invention of each component and content is:
C: carbon makes a significant impact the yield strength of steel, tensile strength, welding property.Carbon can significantly improve intensity by gap solid solution, the effect that carbide can play precipitation strength is formed with other elements, but carbon content control range set, therefore for the steel plate that 350mm is thick, is 0.10% ~ 0.18% by too high welding property and the toughness that can affect again steel of carbon content.
Si: silicon is as reductive agent and reductor in steelmaking process, and Si also can play solution strengthening effect simultaneously, but when silicon is excessive, the toughness of steel can be caused to decline, cause the melting area of welding seam fragility, therefore setting silicone content is 0.15% ~ 0.35%.
Mn: manganese is with low cost, can increase the toughness of steel, intensity and hardness, improves the hardening capacity of steel, improves the hot workability of steel; Manganese amount is too high, easily produces segregation at large steel ingot center, and the eutectoid point carbon content of steel is reduced, thus increases the content organizing Medium pearlite, unfavorable to toughness, therefore setup control scope is 0.90% ~ 1.60%.
P, S: in the ordinary course of things, p and s is all harmful element in steel, increases the fragility of steel.Phosphorus makes welding property reduce, and reduces plasticity, cold-bending property is deteriorated; Sulphur reduces ductility and the toughness of steel, causes crackle when forging and rolling.Therefore, the content of p and s in steel (P≤0.012%, S≤0.005%) should be reduced as far as possible.
Al: aluminium is reductor conventional in steel.A small amount of aluminium (0.020% ~ 0.080%) is added in steel, can crystal grain thinning, improve impelling strength.Aluminium also has oxidation-resistance and corrosion resistance, too high, affects the hot workability of steel, welding property and machinability.
Nb: content is 0.020-0.030%, adding of niobium is grain refining in order to promote steel rolling microstructure, can improve intensity and toughness simultaneously, and niobium can by suppressing the effective refinement microstructure of austenite recrystallization in During Controlled Rolling, and precipitation strength matrix.Heating solid solution Nb stops Austenite Grain Growth, and during cooling, high temperature separates out C, N compound of Nb; Niobium can reduce superheated susceptivity and the temper brittleness of steel.
V:V content is 0.035%-0.065%.Adding vanadium in steel can thinning microstructure crystal grain, improves intensity and toughness.After the controlled rolling of II type, C, N compound of V is separated out, and the strong steel plate that improves obtains intensity; The carbide that vanadium and carbon are formed, can improve resistant to hydrogen corrosive power at high temperature under high pressure.
Ti: titanium is good reductor.Add Ti in steel and can form the carbide of Ti, nitride or carbonitride with C, N element, the grain refining effect that these compounds have had.
The present invention has the following advantages: 1. Steel Alloy content of the present invention is lower, by the proportioning of element in adjusting and optimizing steel plate, can guarantee that under low-carbon-equivalent condition steel plate has good comprehensive mechanical property and welding property, can also reduce the cost, enhance one's market competitiveness; 2. carry out supersonic method defect detecting test, esr is produced heavy thickness water-power steel plate 100% and is met GB/T2970's
level requirement; 3. steel plate has good over-all properties: steel plate transverse direction, longitudinal stretching, impact property are basically identical, has good isotropy and Z-direction performance.4. after remelting, in steel, main component change is little, and comparison of ingredients is even.5. realize high cleanliness after remelting, the inherent dense structure of steel plate, macro defect controls lower.The harm such as steel plate macrostructure flawless, pore defect, its loose and segregation rank≤1.0 grade.6. steel plate maximum ga(u)ge can reach 350mm; 7. steel plate is organized as ferrite+pearlitic mixed structure.
Embodiment
The present invention will be further described by the following examples.
embodiment 1
The step of the water power normalizing type heavy thickness easily welded high-strength Plate Production method of the present embodiment is as follows:
(1) smelt: will containing following weight percent C:0.16%, Si:0.30%, Mn:1.39%, P:0.014%, S:0.001%, Al:0.018%, Nb:0.037%, V:0.052%, the molten steel of Ti:0.001% component, first through electrosmelting, is sent into the refining of LF refining furnace, is then proceeded to VD stove Fruit storage, add CaSi block 110kg/ stove before VD, change inclusion morphology; The vacuum tightness 66.2Pa of VD stove, vacuum hold-time 23min, guarantee effective eliminating of inclusion, gas, ensures the pure of molten steel;
(2) continuous casting: adopt low carbon protective slag, strand rolls off the production line stacking 26 hours, the cleaning of band temperature, turns electroslag remelting furnace base;
(3) esr: electroslag furnace adopts thickness to be the crystallizer of 760mm, and the slag system adopting it to match, have employed low frequency power supply, bipolar series simultaneously, lift the advanced technologies such as crystallizer; For guaranteeing plate surface quality, to the cleaning of electroslag spindle band temperature, cleaning temperature 180 DEG C, shove charge in time after cleaning.
(4) heat: Heating temperature 1230 DEG C, soaking temperature 1150 DEG C, 25 hours total heat-up times, soaking time 7h;
(5) rolling: start rolling temperature 1050 DEG C, adopts the control device of the large pressure of low speed, and percentage pass reduction is to fixing between 8% ~ 10%, and the Static Recrystallization time of reserved 3 ~ 10s between passage, finishing temperature when reaching finished product thickness is 995 DEG C.
(6) rear water-cooled is rolled: steel plate rolls rear rapid water and is chilled to 700 DEG C;
(7) thermal reactor buttress: adopt expansion hydrogen technique to carry out expansion hydrogen to steel plate after water-cooled;
(8) thermal treatment:
Furnace temperature 500 DEG C of shove charges, be rapidly heated (5 hours), to 950 DEG C, are incubated 1 hour, are then cooled to 910 DEG C, are incubated 8 hours.
After steel plate soaking time arrives, hang out immediately and enter water rapid cooling into quenching tank, quenching tank water temperature 25 DEG C, hangs out air cooling after 7s, controls red temperature 600 DEG C.
The mechanical property result of the present embodiment 350mm thick finished steel plate inspection is as shown in table 1.
Table 1 embodiment 1 object performance level
embodiment 2
The step of the water power normalizing type heavy thickness easily welded high-strength Plate Production method of the present embodiment is as follows:
(1) smelt: will containing following weight percent C:0.15%, Si:0.32%, Mn:1.33%, P:0.012%, S:0.002%, Al:0.019%, Nb:0.035%, V:0.052%, the molten steel of Ti:0.001% component is first through electrosmelting, send into the refining of LF refining furnace, then proceed to VD stove Fruit storage, before VD, add CaSi block 120kg/ stove; The vacuum tightness 6.4Pa of VD stove, vacuum hold-time 25min, guarantee effective eliminating of inclusion, gas, ensures the pure of molten steel;
(2) continuous casting: adopt low carbon protective slag, strand rolls off the production line stacking 25 hours, the cleaning of band temperature, turns electroslag remelting furnace base;
(3) esr: electroslag furnace adopts thickness to be the crystallizer of 760mm; For guaranteeing plate surface quality, to the cleaning of electroslag spindle band temperature, cleaning temperature 170 DEG C, shove charge in time after cleaning.
(4) heat: Heating temperature 1225 DEG C, soaking temperature 1160 DEG C, 27 hours total heat-up times, soaking time 8h;
(5) rolling: start rolling temperature 1050 DEG C, adopts the control device of the large pressure of low speed, and percentage pass reduction is to fixing between 8% ~ 10%, and the Static Recrystallization time of reserved 3 ~ 10s between passage, finishing temperature when reaching finished product thickness is 990 DEG C.
(6) rear water-cooled is rolled: steel plate rolls rear rapid water and is chilled to 660 DEG C;
(7) thermal reactor buttress: adopt expansion hydrogen technique to carry out expansion hydrogen to steel plate after water-cooled;
(8) thermal treatment:
Furnace temperature 500 DEG C of shove charges, be rapidly heated (5.5 hours), to 950 DEG C, are incubated 1 hour, are then cooled to 910 DEG C, are incubated 8 hours.
After steel plate soaking time arrives, hang out immediately and enter water rapid cooling into quenching tank, quenching tank water temperature 25 DEG C, hangs out air cooling after 7s, controls red temperature 620 DEG C.
The mechanical property result of the present embodiment 350mm thick finished steel plate inspection is as shown in table 2.
Table 2 embodiment 2 object performance level
embodiment 3
The step of the water power normalizing type heavy thickness easily welded high-strength Plate Production method of the present embodiment is as follows:
(1) smelt: will containing following weight percent C:0.17%, Si:0.28%, Mn:1.36%, P:0.011%, S:0.002%, Al:0.018%, Nb:0.035%, V:0.053%, the molten steel of Ti:0.002% component is first through electrosmelting, send into the refining of LF refining furnace, then proceed to VD stove Fruit storage, before VD, add CaSi block 115kg/ stove; The vacuum tightness 6.5Pa of VD stove, vacuum hold-time 28min, guarantee effective eliminating of inclusion, gas, ensures the pure of molten steel;
(2) continuous casting: adopt low carbon protective slag, strand rolls off the production line stacking 28 hours, the cleaning of band temperature, turns electroslag remelting furnace base;
(3) esr: electroslag furnace adopts thickness to be the crystallizer of 760mm; For guaranteeing plate surface quality, to the cleaning of electroslag spindle band temperature, cleaning temperature 185 DEG C, shove charge in time after cleaning.
(4) heat: Heating temperature 1230 DEG C, soaking temperature 1145 DEG C, 26 hours total heat-up times, soaking time 8h;
(5) rolling: start rolling temperature 1050 DEG C, adopts the control device of the large pressure of low speed, and percentage pass reduction is to fixing between 8% ~ 10%, and the Static Recrystallization time of reserved 3 ~ 10s between passage, finishing temperature when reaching finished product thickness is 995 DEG C.
(6) rear water-cooled is rolled: steel plate rolls rear rapid water and is chilled to 660 DEG C;
(7) thermal reactor buttress: adopt expansion hydrogen technique to carry out expansion hydrogen to steel plate after water-cooled;
(8) thermal treatment:
Furnace temperature 510 DEG C of shove charges, be rapidly heated (5.5 hours), to 950 DEG C, are incubated 1 hour, are then cooled to 910 DEG C, are incubated 8 hours.
After steel plate soaking time arrives, hang out immediately and enter water rapid cooling into quenching tank, quenching tank water temperature 25 DEG C, hangs out air cooling after 7s, controls red temperature 620 DEG C.
The mechanical property result of the present embodiment 350mm thick finished steel plate inspection is as shown in table 3.
Table 3 embodiment 3 object performance level
Claims (3)
1. a water power production method for normalizing type heavy thickness easily welded high-strength steel plate, it is characterized in that comprising smelting, continuous casting, esr, heating, rolling, roll rear water-cooled, thermal reactor is piled up neatly, heat treatment step, each working procedure parameter is as follows:
1. smelting procedure: will containing following mass percent C:0.10%-0.18%, Si:0.15%-0.35%, Mn:0.90%-1.60%, P≤0.02%, S≤0.005%, Nb:0.020%-0.030%, Al:0.010%-0.080%, V:0.035%-0.065%, the molten steel of Ti≤0.025% component is first through electrosmelting, send into the refining of LF refining furnace, then proceed to VD stove Fruit storage, before VD, add CaSi block or Fe-Ca line change inclusion morphology; Vacuum tightness≤the 66.6Pa of Fruit storage, vacuum hold-time >=20min; The add-on of CaSi block or Fe-Ca line is >=100kg/ stove;
2. continuous casting working procedure: adopt low carbon protective slag, strand rolls off the production line stacking more than 24 hours, the cleaning of band temperature, turns electroslag remelting furnace base; Pouring temperature is 1540-1560 DEG C;
3. esr operation: electroslag furnace adopts low frequency power supply, bipolar series, lifts crystallizer technique; To the cleaning of electroslag spindle band temperature, cleaning temperature > 150 DEG C; If can not shove charge in time after cleaning, stacking slow cooling; Crystallizer for electroslag furnace thickness is respectively 640mm, 760mm, 960mm tri-kinds of specifications, adopts the slag system matched with three kinds of specification crystallizers;
4. heating process: maximum heating temperature is 1240 DEG C, soaking temperature is 1100-1200 DEG C, and total heat-up time is 24-30h, soaking time >=5h;
5. rolling process: ESR ingot Heating temperature 1150 DEG C ~ 1180 DEG C, start rolling temperature 1050 DEG C ~ 1100 DEG C, percentage pass reduction is to fixing between 8% ~ 10%, the Static Recrystallization time of reserved 3 ~ 5s between passage, finishing temperature when reaching finished product thickness ensures more than 980 DEG C, total reduction reaches 60%, makes the abundant recrystallize of steel plate; The thickness of steel plate is 350mm;
6. roll rear water-cooled operation: be as cold as between 600 DEG C ~ 700 DEG C soon by ACC water-cooled after steel plate rolls, the rapid water of organizing retaining refinement is chilled to 750-850 DEG C;
7. thermal reactor buttress operation: roll rear employing expansion hydrogen technique and expansion hydrogen is carried out to steel plate;
8. heat treatment step: furnace temperature 500-600 DEG C shove charge, is rapidly heated 4 ~ 6 hours, to 950 ± 20 DEG C, is incubated 1 hour, is then cooled to 910 DEG C, be incubated 5 ~ 10 hours; After steel plate soaking time arrives, hang out immediately and enter water rapid cooling into quenching tank, quenching tank water temperature controls, below 30 DEG C, to hang out air cooling after 5 ~ 10s, controls red temperature between 500 DEG C ~ 700 DEG C.
2. a water power normalizing type heavy thickness easily welded high-strength steel plate, is characterized in that the thickness of steel plate is 350mm, is formed by the component melting of following mass percent, C:0.17%, Si:0.28%, Mn:1.36%, P:0.011%, S:0.002%, Al:0.018%, Nb:0.035%, V:0.053%, Ti:0.002%, surplus is Fe and inevitable impurity.
3. a water power production method for normalizing type heavy thickness easily welded high-strength steel plate, it is characterized in that comprising smelting, continuous casting, esr, heating, rolling, roll rear water-cooled, thermal reactor is piled up neatly, heat treatment step, each working procedure parameter is as follows:
(1) smelt: will containing following weight percent C:0.17%, Si:0.28%, Mn:1.36%, P:0.011%, S:0.002%, Al:0.018%, Nb:0.035%, V:0.053%, the molten steel of Ti:0.002% component is first through electrosmelting, send into the refining of LF refining furnace, then proceed to VD stove Fruit storage, before VD, add CaSi block 115kg/ stove; The vacuum tightness 6.5Pa of VD stove, vacuum hold-time 28min, guarantee effective eliminating of inclusion, gas, ensures the pure of molten steel;
(2) continuous casting: adopt low carbon protective slag, strand rolls off the production line stacking 28 hours, the cleaning of band temperature, turns electroslag remelting furnace base;
(3) esr: electroslag furnace adopts thickness to be the crystallizer of 760mm; For guaranteeing plate surface quality, to the cleaning of electroslag spindle band temperature, cleaning temperature 185 DEG C, shove charge in time after cleaning;
(4) heat: Heating temperature 1230 DEG C, soaking temperature 1145 DEG C, 26 hours total heat-up times, soaking time 8h;
(5) rolling: start rolling temperature 1050 DEG C, adopt the control device of the large pressure of low speed, percentage pass reduction is to fixing between 8% ~ 10%, and the Static Recrystallization time of reserved 3 ~ 10s between passage, finishing temperature when reaching finished product thickness 350mm steel plate is 995 DEG C;
(6) rear water-cooled is rolled: steel plate rolls rear rapid water and is chilled to 660 DEG C;
(7) thermal reactor buttress: adopt expansion hydrogen technique to carry out expansion hydrogen to steel plate after water-cooled;
(8) thermal treatment:
Furnace temperature 510 DEG C of shove charges, are rapidly heated 5.5 hours to 950 DEG C, are incubated 1 hour, are then cooled to 910 DEG C, are incubated 8 hours;
After steel plate soaking time arrives, hang out immediately and enter water rapid cooling into quenching tank, quenching tank water temperature 25 DEG C, hangs out air cooling after 7s, controls red temperature 620 DEG C.
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| CN102796952A (en) * | 2011-05-24 | 2012-11-28 | 舞阳钢铁有限责任公司 | High-thickness steel plate for ocean platform and production method for steel plate |
| CN102676945A (en) * | 2012-04-25 | 2012-09-19 | 舞阳钢铁有限责任公司 | Easily-weldable tempered high-strength ductile steel plate used in hydroelectric projects and production method thereof |
| CN102732789A (en) * | 2012-06-05 | 2012-10-17 | 舞阳钢铁有限责任公司 | High-performance ocean platform steel and its production method |
| CN103088256A (en) * | 2013-01-08 | 2013-05-08 | 舞阳钢铁有限责任公司 | Anti-HIC pipeline steel plate and production method thereof |
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| CN103451530A (en) | 2013-12-18 |
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