CN102653846B - Large-thickness easy-to-weld quenched and tempered high-strength steel plate for hydroelectricity and manufacturing method thereof - Google Patents

Large-thickness easy-to-weld quenched and tempered high-strength steel plate for hydroelectricity and manufacturing method thereof Download PDF

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Publication number
CN102653846B
CN102653846B CN201210125992.1A CN201210125992A CN102653846B CN 102653846 B CN102653846 B CN 102653846B CN 201210125992 A CN201210125992 A CN 201210125992A CN 102653846 B CN102653846 B CN 102653846B
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steel plate
water
temperature
time
thickness
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CN102653846A (en
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赵文忠
王九清
叶建军
张海军
刘印子
张彦召
张东方
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Wuyang Iron and Steel Co Ltd
Hebei Iron and Steel Group Co Ltd
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Wuyang Iron and Steel Co Ltd
Hebei Iron and Steel Group Co Ltd
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Abstract

The invention discloses a large-thickness easy-to-weld quenched and tempered high-strength steel plate used for hydroelectricity, and also relates to a manufacturing method of the steel plate. The large-thickness easy-to-weld quenched and tempered high-strength steel plate used for hydroelectricity disclosed by the invention is composed of the following chemical components in percentage by weight: 0.15%-0.18% of C, 0.15%-0.35% of Si, 0.90%-1.00% of Mn, less than or equal to 0.012% of P, less than or equal to 0.005% of S, 1.52%-1.60% of Ni, 0.30%-0.40% of Cr, 0.020%-0.030% of Nb, 0.020%-0.050% of Al, 0.20%-0.30% of Mo, 0.055%-0.065% of V, 0.0007%-0.0015% of B, 0.015%-0.025% of Ti, and the balance of Fe and inevitable impurities. The manufacturing method of the steel plate comprises the following steps of: electric furnace smelting, LF (ladle furnace)/VD (vacuum distillation) refining, die casting, ingot heating, rolling, water cooling after rolling, thermal stacking, and heat treatment to obtain a finished product. The maximum thickness of the large-thickness easy-to-weld quenched and tempered high-strength steel plate used for hydroelectricity disclosed by the invention can achieve 230 mm; and the large-thickness easy-to-weld quenched and tempered high-strength steel plate has the characteristics of good welding performance, low yield ratio, good low-temperature impact tenacity and good thickness directional property, and has wide application prospects.

Description

One is large thickness easy-weld hardening high-strength steel plate and production method thereof for water power
Technical field
The present invention relates to large thickness easy-weld hardening high-strength steel plate for a kind of water power, relate to a kind of production method of this steel plate simultaneously.
Background technology
The hydraulic generator unit of at present external rated output maximum is 700MW, totally 23.The 700MW that China has put into operation and above hydraulic generator unit have reached nearly 50, estimate to also have 35 rated output be 700MW and above hydraulic generator unit will be before 2015 power generation, wherein maximum rated power is to 8 800MW hydraulic generator units in power station, family dam and 18 770MW hydraulic 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, all higher than Three Gorges unit, therefore further improve the requirement of steel plate thickness and performance, have exceeded the steel plate scope used of existing hydraulic generator unit.Due to the thickness (the thickest 230mm that reaches) of super large, higher welding property requirement, on hydraulic generator unit seat ring, lower ring plate can depend on import by weld hardening high-strength steel plate by large thickness 500MPa level all the time.
Summary of the invention
For the problems referred to above, the object of this invention is to provide large thickness easy-weld hardening high-strength steel plate and production method thereof for a kind of water power, to improve thickness, welding property, anti-lamellar tearing performance, intensity and the low-temperature impact toughness of steel plate.
For realizing above object, the technical solution adopted in the present invention is, a kind of water power is made up of the component of following weight percent with large thickness easy-weld hardening high-strength steel plate: C:0.15%～0.18%, Si:0.15%～0.35%, Mn:0.90%～1.00%, P≤0.012%, S≤0.005%, Ni:1.52%～1.60%, Cr:0.30%～0.40%, Nb:0.020%～0.030%, Al:0.020%～0.050%, Mo:0.20%～0.30%, V:0.055%～0.065%, B:0.0007%～0.0015%, Ti:0.015%～0.025%, surplus is Fe and inevitable impurity.
The maximum ga(u)ge of described steel plate is 230mm.
Meanwhile, technical scheme of the present invention has also adopted the production method of a kind of water power with large thickness easy-weld hardening high-strength steel plate, comprises the steps:
(1) smelt: will contain following weight percent C:0.15%～0.18%, Si:0.15%～0.35%, Mn:0.90%～1.00%, P≤0.012%, S≤0.005%, Ni:1.52%～1.60%, Cr:0.30%～0.40%, Nb:0.020%～0.030%, Al:0.020%～0.050%, Mo:0.20%～0.30%, V:0.055%～0.065%, B:0.0007%～0.0015%, the molten steel of Ti:0.015%～0.025% component is first through electrosmelting, send into the refining of LF refining furnace, in the time that meeting or exceeding 1640 ± 10 ℃, liquid steel temperature proceeds to VD stove Fruit storage, before VD, add CaSi piece >=100kg/ stove or Fe-Ca line 400～450m to change inclusion morphology,
(2) die casting: adopt Large Flat ingot mold to pour into a mould, and adopt protection of inert gas cast;
(3) heating: maximum heating temperature is 1240 ℃, and soaking temperature is 1180～1200 ℃, be 24～30h total heat-up time, soaking time >=5h;
(4) rolling: adopt high temperature recrystallize technology controlling and process rolling technology, start rolling temperature is 1000～1050 ℃, low speed heavy reduction rolling, single pass draught is 10～20%, and finishing temperature is 940 ± 20 ℃, and accumulative total draft is 70～80%;
(5) roll rear water-cooled: steel plate rolls rear rapid water and is chilled to 780～810 ℃;
(6) thermal reactor buttress: timely wind sheltering stacking after water-cooled, stacking temperature is 650～680 ℃, the stacking time is 72h, obtains steel plate crude product;
(7) thermal treatment:
Intercritical hardening: steel plate crude product is carried out to heating and thermal insulation processing at 760 ℃～800 ℃, then put into fast quenching bath water medium quenching, steel plate enters before water water temperature not higher than 25 ℃, and after water outlet, water temperature is not higher than 30 ℃, and steel plate enters the water time and is controlled between 60～70min;
Tempering: tempering temperature is between 660～680 ℃, and soaking time, at 3.5～4.0min/mm, obtains finished steel plate.
Vacuum tightness≤the 66.6Pa of the Fruit storage described in step (1), vacuum hold-time >=25min.
The described teeming temperature of step (2) is 1545～1555 ℃, and the minimum thickness of band steel cover half is 780mm.
Large thickness easy-weld hardening high-strength steel of the present invention adopts carbon, manganese solution strengthening; Add a small amount of Nb, V crystal grain thinning, its carbonitride plays dispersion-strengthened action; Nickel, as main strengthening element, both can guarantee the low-temperature flexibility of steel, also can improve the welding property of steel; By follow-up rational thermal treatment process, steel plate has large thickness and good performance.
The each component of steel plate and content effect are in the present invention:
C:0.15%～0.18%, yield strength, tensile strength, the welding property of carbon on steel makes a significant impact.Carbon can significantly improve armor plate strength by gap solid solution, for the thick steel plate of 230mm, guarantees that a certain amount of carbon content is necessary, but too high welding property and the toughness that can affect again steel of carbon content.
Si:0.15%～0.35%, silicon is as reductive agent and reductor in steelmaking process, and simultaneously Si also can play solution strengthening effect, but silicon is when excessive, can cause the toughness of steel to decline, and causes the melting area of welding seam fragility.
Mn:0.90%～1.00%, manganese is with low cost, can increase toughness, intensity and the hardness of steel, 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, thereby increases the content of organizing Medium pearlite, unfavorable to toughness.
Ni:1.52%～1.60%, nickel is principal character element of the present invention, and nickel is dissolved in austenite, suppresses austenite recrystallization, and refine austenite crystal grain improves steel plate low-temperature flexibility.The nickel that adds in addition certain amount can also improve weldability and notch toughness.
Cr:0.30%-0.40%, chromium is the principal element that carbide forms, and increases austenitic stability, reduces critical cooling velocity, improves hardening capacity, temper resistance and impelling strength, can reduce weldability but add-on is more.
Mo:0.20%-0.30%, the carbide of molybdenum is dissolved in austenite, improves the intensity of steel, improves hardening capacity, stops austenite to be grown up, and improves temper resistance, eliminates temper brittleness.
P≤0.012%, S≤0.005%: in the ordinary course of things, p and s is all harmful element in steel, the fragility of increase steel.Phosphorus reduces welding property, reduces plasticity, makes cold-bending property variation; Sulphur reduces ductility and the toughness of steel, causes crackle in the time of forging and rolling.Therefore, should reduce the content of p and s in steel as far as possible.
Al:0.020%～0.050%, aluminium is reductor conventional in steel.In steel, add a small amount of aluminium, can crystal grain thinning, improve impelling strength.Aluminium also has oxidation-resistance and corrosion resistance, too high hot workability, welding property and the machinability that affects steel.
Nb:0.020%～0.030%, adding of niobium is the grain refining in order to promote steel rolling microstructure, can improve intensity and toughness simultaneously, niobium can pass through to suppress the effective refinement microstructure of austenite recrystallization in During Controlled Rolling, and precipitation strength matrix.Niobium can reduce superheated susceptivity and the temper brittleness of steel.In welding process, the alligatoring of austenite crystal when the segregation of niobium, boron atom and separating out can hinder heating, and guarantee to obtain more tiny heat affected zone tissue after welding, improve welding property.
V:0.055%～0.065%, vanadium is the good reductor of steel.In steel, adding vanadium can thinning microstructure crystal grain, improves intensity and toughness.The carbide that vanadium and carbon form can improve anti-hydrogen-type corrosion ability under High Temperature High Pressure.
Ti:0.015%～0.025%, titanium is good reductor.In steel, add carbide, nitride or carbonitride that Ti can form with C, N element Ti, the grain refining effect that these compounds have had.
B:0.0007%～0.0015%, boron increases hardening capacity, and its effect is higher more than 100 times than chromium, manganese, but boron steel easily separates out boride at crystal boundary and causes hot-shortly, and weldability caused to larger infringement.
The present invention has the following advantages: 1. Steel Alloy content of the present invention is lower, optimize the proportioning of element in steel plate by adjustment, can under low-carbon-equivalent condition, guarantee that steel plate has good tissue, over-all properties and welding property, can also reduce the cost, enhance one's market competitiveness, reach the target of substituting imports with production; 2. the production method of steel plate of the present invention adopts the rolling of recrystallize type to be aided with cooling technique fast, has solved mill milling insufficient pressure and causes the problem of coarse grains inequality, the high comprehensive performance of steel plate; Be applicable to the manufacture of lower ring plate on huge generating set seat ring, and can be applied to other and require steel plate to there is the making of the structural part of better weldability, have a extensive future; 3. armor plate strength of the present invention is higher, and yield strength is more than 440MPa, and tensile strength is between 540MPa～720MPa; 0 ℃ of impact of collision merit KV 2be not less than 50 joules, 0 ℃ transverse impact merit KV 2be not less than 30 joules; Steel plate Z-direction stretching relative reduction in area is greater than 35%; 4. steel plate maximum ga(u)ge can reach 230mm; 5. steel plate is organized as the complex tissue take tempering troostite+tempering ferrite bainite as main and a small amount of granular ferrite.
Accompanying drawing explanation
Fig. 1. grooves of welding joints schematic diagram (20mm);
Fig. 2. welding joint hardness test point schematic diagram.
Embodiment
Embodiment 1
Large thickness easy-weld hardening high-strength steel plate for the water power of the present embodiment, thickness is 230mm, is made up of: C:0.16% the component of following weight percent, Si:0.27%, Mn:0.91%, P:0.009%, S:0.001%, Al:0.043%, Nb:0.026%, V:0.061%, Ni:1.58%, Cr:0.34%, Ti:0.021%, Mo:0.25%, B:0.0013%, surplus is iron and inevitable impurity.
The water power of the present embodiment is as follows by the step that can weld large thickness quenched high strength steel production method:
(1) smelt: will contain following weight percent C:0.16%, Si:0.27%, Mn:0.91%, P:0.009%, S:0.001%, Al:0.043%, Nb:0.026%, V:0.061%, Ni:1.58%, Cr:0.34%, Ti:0.021%, Mo:0.25%, the molten steel of B:0.0013% component is first through electrosmelting, send into the refining of LF refining furnace, in the time that liquid steel temperature meets or exceeds 1640 ℃, proceed to VD stove Fruit storage, before VD, add Fe-Ca line 450m to change inclusion morphology; The vacuum tightness 66.6Pa of VD stove, vacuum hold-time 25min, guarantees effective eliminating of inclusion, gas, guarantees the pure of molten steel;
(2) die casting: adopt Large Flat ingot mold (minimum thickness 780mm) to pour into a mould, teeming temperature is 1550 ℃, and adopt protection of inert gas cast;
(3) heating: 1240 ℃ of maximum heating temperatures, 1200 ℃ of soaking temperatures, total 29 hours heat-up times, soaking time 6h;
(4) rolling: adopt high temperature recrystallize technology controlling and process rolling technology, 1020 ℃ of start rolling temperatures, low speed heavy reduction rolling, single pass draught is 18%, 950 ℃ of finishing temperatures, accumulative total draft is 75%;
(5) roll rear water-cooled: steel plate rolls rear rapid water and is chilled to 785 ℃;
(6) thermal reactor buttress: timely wind sheltering stacking after water-cooled, 650 ℃ of stacking temperature, stacking time 72h, obtains steel plate crude product;
(7) thermal treatment:
Intercritical hardening: steel plate crude product is carried out to heating and thermal insulation processing at 780 ℃, then enter fast quenching bath water medium and quench, steel plate enters before water 13 ℃ of water temperatures, 23 ℃ of water temperatures after water outlet, steel plate enters the water time and is controlled at 70min;
Tempering: tempering temperature is at 680 ℃, and soaking time 3.5min/mm, obtains finished steel plate.
The mechanical property of the steel plate of this example: yield strength 493MPa, tensile strength: 626MPa, 0 ℃ of impact of collision merit KV 2average 100J, 0 ℃ of transverse impact merit KV 2average 85J, Z-direction performance is average 45%.
Embodiment 2
Large thickness easy-weld hardening high-strength steel plate for the water power of the present embodiment, thickness is 200mm, is made up of: C:0.17% the component of following weight percent, Si:0.30%, Mn:0.95%, P:0.010%, S:0.002%, Al:0.030%, Nb:0.022%, V:0.055%, Ni:1.60%, Cr:0.30%, Ti:0.018%, Mo:0.27%, B:0.0015%, surplus is iron and inevitable impurity.
The water power of the present embodiment is as follows by the step that can weld large thickness quenched high strength steel production method:
(1) smelt: will contain following weight percent C:0.17%, Si:0.30%, Mn:0.95%, P:0.010%, S:0.002%, Al:0.030%, Nb:0.022%, V:0.055%, Ni:1.60%, Cr:0.30%, Ti:0.018%, Mo:0.27%, the molten steel of B:0.0015% component is first through electrosmelting, send into the refining of LF refining furnace, in the time that liquid steel temperature meets or exceeds 1640 ℃, proceed to VD stove Fruit storage, before VD, add CaSi >=120kg/ stove to change inclusion morphology; The vacuum tightness 66.6Pa of VD stove, vacuum hold-time 25min, guarantees effective eliminating of inclusion, gas, guarantees the pure of molten steel;
(2) die casting: adopt Large Flat ingot mold (minimum thickness 780mm) to pour into a mould, teeming temperature is 1548 ℃, and adopt protection of inert gas cast;
(3) heating: 1240 ℃ of maximum heating temperatures, 1180 ℃ of soaking temperatures, total 27 hours heat-up times, soaking time 6h;
(4) rolling: adopt high temperature recrystallize technology controlling and process rolling technology, 1050 ℃ of start rolling temperatures, low speed heavy reduction rolling, single pass draught is 20%, 945 ℃ of finishing temperatures, accumulative total draft is 77%;
(5) roll rear water-cooled: steel plate rolls rear rapid water and is chilled to 790 ℃;
(6) thermal reactor buttress: timely wind sheltering stacking after water-cooled, 660 ℃ of stacking temperature, stacking time 72h, obtains steel plate crude product;
(7) thermal treatment:
Intercritical hardening: steel plate crude product is carried out to heating and thermal insulation processing at 780 ℃, then enter fast quenching bath water medium and quench, steel plate enters before water 18 ℃ of water temperatures, 27 ℃ of water temperatures after water outlet, steel plate enters the water time and is controlled at 65min;
Tempering: tempering temperature is at 680 ℃, and soaking time 3.5min/mm, obtains finished steel plate.
The mechanical property of the steel plate of this example: yield strength 475MPa, tensile strength: 605MPa, 0 ℃ of impact of collision merit KV 2average 95J, 0 ℃ of transverse impact merit KV 2average 80J, Z-direction performance is average 43.5%.
Embodiment 3
Large thickness easy-weld hardening high-strength steel plate for the water power of the present embodiment, thickness is 220mm, is made up of: C:0.17% the component of following weight percent, Si:0.29%, Mn:0.95%, P:0.009%, S:0.001%, Al:0.025%, Nb:0.020%, V:0.063%, Ni:1.60%, Cr:0.30%, Ti:0.020%, Mo:0.28%, B:0.0015%, surplus is iron and inevitable impurity.
The water power of the present embodiment is as follows by the step that can weld large thickness quenched high strength steel production method:
(1) smelt: will contain following weight percent C:0.17%, Si:0.29%, Mn:0.95%, P:0.009%, S:0.001%, Al:0.025%, Nb:0.020%, V:0.063%, Ni:1.60%, Cr:0.30%, Ti:0.020%, Mo:0.28%, the molten steel of B:0.0015% component is first through electrosmelting, send into the refining of LF refining furnace, in the time that liquid steel temperature meets or exceeds 1650 ℃, proceed to VD stove Fruit storage, before VD, add CaSi piece >=120kg/ stove to change inclusion morphology; The vacuum tightness 66.6Pa of VD stove, vacuum hold-time 25min, guarantees effective eliminating of inclusion, gas, guarantees the pure of molten steel;
(2) die casting: adopt Large Flat ingot mold (minimum thickness 780mm) to pour into a mould, teeming temperature is 1548 ℃, and adopt protection of inert gas cast;
(3) heating: 1235 ℃ of maximum heating temperatures, 1200 ℃ of soaking temperatures, total 27 hours heat-up times, soaking time 6h;
(4) rolling: adopt high temperature recrystallize technology controlling and process rolling technology, 1045 ℃ of start rolling temperatures, low speed heavy reduction rolling, single pass draught is 17%, 930 ℃ of finishing temperatures, accumulative total draft is 75%;
(5) roll rear water-cooled: steel plate rolls rear rapid water and is chilled to 780 ℃;
(6) thermal reactor buttress: timely wind sheltering stacking after water-cooled, 650 ℃ of stacking temperature, stacking time 72h, obtains steel plate crude product;
(7) thermal treatment:
Intercritical hardening: steel plate crude product is carried out to heating and thermal insulation processing at 780 ℃, then enter fast quenching bath water medium and quench, steel plate enters before water 15 ℃ of water temperatures, 26 ℃ of water temperatures after water outlet, steel plate enters the water time and is controlled at 68min;
Tempering: tempering temperature is at 680 ℃, and soaking time 3.5min/mm, obtains finished steel plate.
The mechanical property of the steel plate of this example: yield strength 480MPa, tensile strength: 615MPa, 0 ℃ of impact of collision merit KV 2average 96J, 0 ℃ of transverse impact merit KV 2average 82J, Z-direction performance is average 41.5%.
Welding performance test:
This tests steel plate used is the steel plate described in embodiment 1.
1. tiltedly Y type groove welding cold crack test
Because test steel plate thickness is large, therefore sample is thinned to 50mm while test.
1.1 welding condition (in table 1)
Table 1 cracking test welding condition
Welding process Welding material Specification Welding current Weldingvoltage Welding speed
Electrode arc welding J607RH Φ4.0mm 170±10A 24±1V 150±10mm/min
1.2 test-results (in table 2)
Table 2 cracking test result
2 welding joint technological property tests
2.1 grooves of welding joints forms (seeing Fig. 1)
2.2 welding conditions (in table 3,120 ℃ of preheatings, 20 ℃ of envrionment temperatures)
Table 3 welding condition
Postwelding test plate (panel), through defect detecting test, is not found the welding flaws such as crackle.
2.3 welding joint mechanical property test-results
By the requirement of JB4708-2000 " steel pressure vessel welding technology evaluation ", Welded Joints carries out corresponding mechanical properties test, the results are shown in Table 4.
The mechanical property of table 4 welding joint
2.4 welding joint hardness test results
As shown in Figure 2, test-results is in table 5 in welding joint hardness test point position.
Table 5 welding joint hardness test result (HV10)

Claims (5)

1. a large thickness easy-weld hardening high-strength steel plate for water power, it is characterized in that, chemical composition by following weight percentage forms: C:0.15%～0.18%, Si:0.15%～0.35%, Mn:0.90%～1.00%, P≤0.012%, S≤0.005%, Ni:1.52%～1.60%, Cr:0.30%～0.40%, Nb:0.020%～0.030%, Al:0.020%～0.050%, Mo:0.20%～0.30%, V:0.055%～0.065%, B:0.0007%～0.0015%, Ti:0.015%～0.025%, surplus is Fe and inevitable impurity;
Described water power comprises the steps: by the production method of large thickness easy-weld hardening high-strength steel plate
(1) smelt: will contain following weight percent C:0.15%～0.18%, Si:0.15%～0.35%, Mn:0.90%～1.00%, P≤0.012%, S≤0.005%, Ni:1.52%～1.60%, Cr:0.30%～0.40%, Nb:0.020%～0.030%, Al:0.020%～0.050%, Mo:0.20%～0.30%, V:0.055%～0.065%, B:0.0007%～0.0015%, the molten steel of Ti:0.015%～0.025% component is first through electrosmelting, send into the refining of LF refining furnace, in the time that meeting or exceeding 1640 ± 10 ℃, liquid steel temperature proceeds to VD stove Fruit storage, before VD, add CaSi piece >=100kg/ stove or Fe-Ca line 400～450m,
(2) die casting: adopt Large Flat ingot mold to pour into a mould, and adopt protection of inert gas cast;
(3) heating: maximum heating temperature is 1240 ℃, and soaking temperature is 1180～1200 ℃, be 24～30h total heat-up time, soaking time >=5h;
(4) rolling: adopt high temperature recrystallize technology controlling and process rolling technology, start rolling temperature is 1000～1050 ℃, low speed heavy reduction rolling, single pass draught is 10～20%, and finishing temperature is 940 ± 20 ℃, and accumulative total draft is 70～80%;
(5) roll rear water-cooled: steel plate rolls rear rapid water and is chilled to 780～810 ℃;
(6) thermal reactor buttress: timely wind sheltering stacking after water-cooled, stacking temperature is 650～680 ℃, the stacking time is 72h, obtains steel plate crude product;
(7) thermal treatment:
Intercritical hardening: steel plate crude product is carried out to heating and thermal insulation processing at 760～800 ℃, then put into fast quenching bath water medium quenching, steel plate enters before water water temperature not higher than 25 ℃, after water outlet, water temperature is not higher than 30 ℃, and steel plate enters the water time and is controlled between 60～70min;
Tempering: tempering temperature is between 660～680 ℃, and soaking time, at 3.5～4.0min/mm, obtains finished steel plate.
2. water power according to claim 1 is 230mm with the thickness of large thickness easy-weld hardening high-strength steel plate.
3. a production method for large thickness easy-weld hardening high-strength steel plate for water power as claimed in claim 1, is characterized in that, comprises the steps:
(1) smelt: will contain following weight percent C:0.15%～0.18%, Si:0.15%～0.35%, Mn:0.90%～1.00%, P≤0.012%, S≤0.005%, Ni:1.52%～1.60%, Cr:0.30%～0.40%, Nb:0.020%～0.030%, Al:0.020%～0.050%, Mo:0.20%～0.30%, V:0.055%～0.065%, B:0.0007%～0.0015%, the molten steel of Ti:0.015%～0.025% component is first through electrosmelting, send into the refining of LF refining furnace, in the time that meeting or exceeding 1640 ± 10 ℃, liquid steel temperature proceeds to VD stove Fruit storage, before VD, add CaSi piece >=100kg/ stove or Fe-Ca line 400～450m,
(2) die casting: adopt Large Flat ingot mold to pour into a mould, and adopt protection of inert gas cast;
(3) heating: maximum heating temperature is 1240 ℃, and soaking temperature is 1180～1200 ℃, be 24～30h total heat-up time, soaking time >=5h;
(4) rolling: adopt high temperature recrystallize technology controlling and process rolling technology, start rolling temperature is 1000～1050 ℃, low speed heavy reduction rolling, single pass draught is 10～20%, and finishing temperature is 940 ± 20 ℃, and accumulative total draft is 70～80%;
(5) roll rear water-cooled: steel plate rolls rear rapid water and is chilled to 780～810 ℃;
(6) thermal reactor buttress: timely wind sheltering stacking after water-cooled, stacking temperature is 650～680 ℃, the stacking time is 72h, obtains steel plate crude product;
(7) thermal treatment:
Intercritical hardening: steel plate crude product is carried out to heating and thermal insulation processing at 760～800 ℃, then put into fast quenching bath water medium quenching, steel plate enters before water water temperature not higher than 25 ℃, after water outlet, water temperature is not higher than 30 ℃, and steel plate enters the water time and is controlled between 60～70min;
Tempering: tempering temperature is between 660～680 ℃, and soaking time, at 3.5～4.0min/mm, obtains finished steel plate.
4. the production method of large thickness easy-weld hardening high-strength steel plate for water power according to claim 3, is characterized in that, the vacuum tightness≤66.6Pa of the described Fruit storage of step (1), vacuum hold-time >=25min.
5. the production method of large thickness easy-weld hardening high-strength steel plate for water power according to claim 3, is characterized in that, the described teeming temperature of step (2) is 1545～1555 ℃, and the minimum thickness of ingot slab mould is 780mm.
CN201210125992.1A 2012-04-26 2012-04-26 Large-thickness easy-to-weld quenched and tempered high-strength steel plate for hydroelectricity and manufacturing method thereof Expired - Fee Related CN102653846B (en)

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