CN104674130A - Method for producing large-thickness lamination-crack-resistant tempered high-strength steel plate - Google Patents
Method for producing large-thickness lamination-crack-resistant tempered high-strength steel plate Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
Abstract
The invention discloses a method for producing a large-thickness lamination-crack-resistant tempered high-strength steel plate. The method is characterized by comprising the steps: smelting, performing continuous casting, performing electroslag remelting, heating, rolling, annealing and performing heat treatment. The steel plate comprises the following chemical components in percentage by weight: 0.14-0.18 percent of C, 0.20-0.50 percent of Si, 0.95-1.25 percent of Mn, less than or equal to 0.015 percent of P, less than or equal to 0.005 percent of S, 0.80-1.15 percent of Ni, 0.40-0.60 percent of Cr, 0.40-0.60 percent of Mo, 0.020-0.050 percent of Nb, 0.010-0.030 percent of Ti, 0.020-0.045 percent of TAl, and the balance of Fe and inevitable impurities. According to the method, electroslag remelting treatment is adopted, good overall performance of the large-thickness steel plate with the diameter of 30mm can be met due to the reasonable controlled rolling and heat treatment process, and the production cost is reduced; and the specification range is wide. The method adopts the steps of electric furnace smelting, continuous casting and electroslag remelting smelting, the contents of P and S in the obtained tempered high-strength steel plate are low, and the steel is pure; and moreover, a large-slab electroslag remelting technology is adopted, the round ingot hammer cogging process during electroslag remelting is reduced, the production period is shortened, and the cost is obviously reduced.
Description
Technical field
The present invention relates to a kind of production method of quenched and tempered high tensile strength plate, the production method of especially a kind of heavy thickness anti-lamellar tearing quenching and tempering, high plate.
Background technology
Superior alloy steel and the special alloy quantity of modern industry need of production are increasing, require to improve constantly to metallic substance quality and performance, particularly engineering machinery, nuclear power, pressurized vessel, military project, fine work mould and the large substance quality steel plate of other heavy thickness etc., the mechanical property of steel, welding property and Z-direction performance etc. are had higher requirement, and common smelting casting means cannot be satisfied the demand, especially in internal soundness, do not reach requirement.
In recent years, along with the development of domestic and international hydropower industry, the requirement of user to heavy thickness water-power steel plate is more and more higher.Because water-power steel environment for use is special, owner requires very strict to the intensity, toughness, welding property, corrosion resistance nature etc. of steel plate.
Summary of the invention
The technical problem to be solved in the present invention is to provide the production method that a kind of maximum ga(u)ge reaches 300mm, the modified high-strength S550Q/Z35 steel plate of the anti-lamellar tearing of high performance heavy thickness.
For solving the problems of the technologies described above, the technical solution used in the present invention is: it comprises smelting, continuous casting, esr, heating, rolling, annealing and heat treatment step, the weight percentage of described steel plate chemical composition is: C 0.14% ~ 0.18%, Si 0.20% ~ 0.50%, Mn 0.95% ~ 1.25%, P≤0.015%, S≤0.005%, Ni 0.80% ~ 1.15%, Cr 0.40% ~ 0.60%, Mo 0.40% ~ 0.60%, Nb 0.020% ~ 0.050%, Ti 0.010% ~ 0.030%, the full aluminium of TAl() 0.020% ~ 0.045%, surplus is Fe and inevitable impurity.
Smelting procedure of the present invention: molten steel first through electrosmelting, then is sent in LF refining furnace and carried out refining, then proceeds to vacuum degassing furnace and carries out vacuum-treat; Described vacuum treated vacuum tightness≤67Pa and hold-time are not less than 20min.
Esr operation of the present invention: carry out esr after strand being made electrode, adopt five yuan of slag systems, crystallizer comprises 640mm, 700mm, 760mm and 960mm tetra-kinds of optional sections, average molten speed≤22kg/min, per minute adds Al grain 25 ~ 30g/ steel per ton, adopts air-cooled accelerating cooling.
Heating process of the present invention: ESR ingot enters stove and boils in a covered pot over a slow fire steel 50 ~ 70min, then adopt low speed to burn steel, less than 1000 DEG C heat-up rates, 100 ~ 120 DEG C/h, maximum heating temperature 1240 ± 10 DEG C, is then incubated 350 ~ 500min.
Rolling process of the present invention adopts II type controlled rolling: I stage rolling temperature is 930 ~ 1100 DEG C, and single pass draught is 10% ~ 25%, and accumulative draft is 40% ~ 50%; II stage rolling temperature is 810 ~ 930 DEG C, and single pass draught is 10% ~ 27%, and accumulative draft is 20% ~ 30%, and finishing temperature 810 ± 10 DEG C, rolls rear naturally cooling.
Annealing operation of the present invention: described steel plate carries out the process of expansion hydrogen at burial pit, surface of steel plate temperature >=450 DEG C; Steel plate expands hydrogen treatment temp 620 ± 10 DEG C in burial pit, guarantees that warming and cooling rate is not more than 50 DEG C/h; Steel plate soaking time is not less than 72h; Steel plate tapping temperature≤200 DEG C, air cooling after coming out of the stove.
In annealing operation of the present invention, the total time inside furnace of steel plate is not less than 150 hours.
The present invention is characterized in that, described heat treatment step: quenching temperature 870 ~ 920 DEG C, soaking time 2.0min/mm steel plate thickness, cooling process after quenching; Tempering temperature 620 ~ 690 DEG C, soaking time 4.0min/mm steel plate thickness.
The beneficial effect adopting technique scheme to produce is: the present invention adopts esr process, through rational controlled rolling and thermal treatment process, can realize meeting the good over-all properties of 300mm heavy thickness steel plate, again reduce production cost simultaneously; Specification limit is wide, meets the market requirement constantly increasing consumption.
The present invention adopts electric furnace+continuous casting+electric slag refusion and smelting, and P, S content of gained quenching and tempering, high plate is low, and steel is pure.The present invention adopts slab electroslag remelting technique, decreases the operation of esr billet hammer cogging, shortens the production cycle, significantly reduce cost.The present invention adopts II type rolling technology, for the development of large thick steel plate controlled rolling technology theory provides practical basis, has enriched controlled rolling technology theory.
Gained thickness 300mm steel plate of the present invention reaches performance and is after testing: whole plate meets appropriate level flaw detection requirement; Transverse direction, longitudinal stretching, impact property are basically identical, have good isotropy; There is better impelling strength and Z-direction performance; Optimize steel ingot alloying constituent, after remelting, in steel, main component change is little, and comparison of ingredients is even; 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.Gained steel plate of the present invention has good isotropy, impelling strength and Z-direction performance, meets for various requirements to the large substance steel plate of heavy thickness such as water power, wind-powered electricity generation, heavy construction structural steels; And its technique is simple, easy handling, lumber recovery is high, is suitable for all Thick Plate Plant with good conditionsi and produces.
Embodiment
Below in conjunction with specific embodiment, the present invention is further detailed explanation.
Described in the production method of this heavy thickness anti-lamellar tearing quenching and tempering, high plate, the weight percentage of steel plate chemical composition is: C 0.14% ~ 0.18%, Si 0.20% ~ 0.50%, Mn 0.95% ~ 1.25%, P≤0.015%, S≤0.005%, Ni 0.80% ~ 1.15%, Cr 0.40% ~ 0.60%, Mo 0.40% ~ 0.60%, Nb 0.020% ~ 0.050%, Ti 0.010% ~ 0.030%, full aluminium TAl 0.020% ~ 0.045%, surplus is Fe and inevitable impurity.
The processing step of the production method of this heavy thickness anti-lamellar tearing quenching and tempering, high plate is as follows: (1) smelting procedure: comprise Electric furnace steel making, LF refining and vacuum processing step; Electric furnace steel making step adopts ultra-high power electric arc furnace, and choose high quality raw material, melting period adopts large quantity of slag stream slag operation, keeps away slag tapping; After tapping, molten steel is sent in LF refining furnace and is carried out LF refining, and quick deoxidation, de-S, remove reducing slag after adjustment temperature, composition are suitable; Again make reducing slag at VD/VOD stove and carry out Fruit storage, vacuum tightness≤67Pa in vacuum process and hold-time are not less than 20min.
(2) continuous casting working procedure: by the molten steel after smelting through being continuously cast into strand.
(3) esr operation: by strand according to schedule size carry out esr after making electrode, remove continuously cast bloom scale on surface as far as possible; Adopt five yuan of slag system (CaO-MgO-Al
2o
3-SiO
2-CaF
2), crystallizer comprises 640mm, 700mm, 760mm, 960mm tetra-kinds of optional sections, and average melting speed control is at≤22kg/min, and in fusion-casting process, per minute adds Al grain 25 ~ 30g/ steel per ton, to guarantee the component requirements of fine grained steel; Adopt air-cooled accelerating cooling, to improve as-cast structure, to reduce inclusion content.
(4) ESR ingot cleaning and stacking slow cooling operation: send steel rolling by the ESR ingot heat after remelting, the cleaning of band temperature, band temperature cleaning Li Wendu > 150 DEG C; If can not shove charge in time after cleaning, answer stacking slow cooling, prevent from bursting.
(5) heating process: ESR ingot enters stove and boils in a covered pot over a slow fire steel 50 ~ 70min, then adopt low speed to burn steel, heat-up rate 100 ~ 120 DEG C/h when less than 1000 DEG C, maximum heating temperature 1240 ± 10 DEG C, is then incubated 350 ~ 500min.
(6) rolling process: adopt II type controlled rolling, i.e. austenite recrystallization district and Unhydrated cement controlled rolling; Austenite recrystallization district takes high temperature low speed, depresses rolling greatly, distortion is permeated fully, obtains even, tiny recrystallized structure, be specially: rolling temperature is 930 ~ 1100 DEG C, single pass draught is 10% ~ 25%, and accumulative draft is 40% ~ 50%;
Austenite Unhydrated cement controls total reduction and the pressure of suitable passage distributes, and further crystal grain thinning, is specially: rolling temperature is 810 ~ 930 DEG C, and single pass draught is 10% ~ 27%, and accumulative draft is 20% ~ 30%, finishing temperature 810 ± 10 DEG C; Roll rear naturally cooling.
(7) annealing operation: adopt and expand hydrogen treatment process; Steel plate is hung in burial pit and carry out the process of expansion hydrogen, surface of steel plate temperature >=450 DEG C; Steel plate expands hydrogen treatment temp 620 ± 10 DEG C in burial pit, guarantees that warming and cooling rate is not more than 50 DEG C/h; Steel plate soaking time is not less than 72h; Steel plate tapping temperature≤200 DEG C, air cooling after coming out of the stove; The total time inside furnace of steel plate (i.e. the total time of steel plate in burial pit) is not less than 150 hours, further hydrogen richness is down to lower level, reduces the tendency of hydrogen embrittlement and hydrogen induced cracking.
(8) UT (Ultrasonic Testing) operation: according to corresponding non-destructive testing standard, UT (Ultrasonic Testing) is carried out to the whole plate of steel plate after expanding hydrogen.
(9) heat treatment step: quenching temperature 870 ~ 920 DEG C, soaking time 2.0min/mm steel plate thickness, fast deepfreeze after quenching, whole plate adopts quenching tank accelerating cooling; Tempering temperature 620 ~ 690 DEG C, soaking time 4.0min/mm steel plate thickness.
Embodiment 1: steel plate composition and the concrete technology of the production method of this quenching and tempering, high plate are as described below.
The steel grade S550Q/Z35 of the present embodiment, steel plate thickness is 300mm, and compression ratio is 3.35; Ingredients Weight percentage composition is: C 0.16%, Si 0.35%, Mn 1.05%, P 0.012%, S 0.003%, Ni 1.00%, Cr 0.50%, Mo 0.45%, Nb 0.035%, Ti 0.030%, TAl 0.025%, and surplus is Fe and inevitable impurity.
Processing step: (1) smelting procedure: by molten steel first through electrosmelting, then send into the refining of LF refining furnace and adjusting component, when liquid steel temperature reaches 1560 DEG C, proceed to vacuum degassing furnace (VD stove) vacuum-treat; Add CaSi block before vacuum, nodularization is mingled with, and vacuum tightness is not more than 66Pa, destroys vacuum during 20 minutes vacuum hold-times.
(2) casting operation: the molten steel after smelting is cast; Esr raw material adopts continuous casting to produce, and superheating temperature is 23 DEG C, and throwing speed is 1.20m/min, and guarantees suitable secondary cooling water coupling.
(3) esr operation: by the strand of having cast according to schedule size make electrode, remove continuously cast bloom scale on surface; Adopt five yuan of slag system (CaO-MgO-Al
2o
3-SiO
2-CaF
2), add Al grain 28g/min; Select 960mm water mold to carry out remelting, average melting speed control, at 22kg/min, adopts air-cooled accelerating cooling.
(4) ESR ingot cleaning and stacking slow cooling operation: send steel rolling by the ESR ingot heat after remelting, the cleaning of band temperature, surface temperature 400 DEG C during cleaning, shove charge in time after cleaning.
(5) heating process: ESR ingot enters stove and boils in a covered pot over a slow fire steel 60min, then adopt low speed to burn steel, less than 1000 DEG C heat-up rates, 100 DEG C/h, maximum heating temperature 1240 DEG C, is then incubated 450min.
(6) rolling process: adopt II type controlled rolling, I stage rolling temperature is 1000 DEG C, and single pass draught is 20%, and accumulative draft is 45%; II stage rolling temperature is 860 DEG C, and single pass draught is 20%, and accumulative draft is 25%, and finishing temperature 820 DEG C, rolls rear naturally cooling.
(7) annealing operation: steel plate is hung in burial pit and carry out the process of expansion hydrogen, surface of steel plate temperature 480 DEG C; Steel plate expands hydrogen treatment temp 620 DEG C in burial pit, warming and cooling rate 30 DEG C/h; Steel plate soaking time 80h; The total time inside furnace of steel plate 200 hours; Steel plate tapping temperature 200 DEG C, air cooling after coming out of the stove.
(8) UT (Ultrasonic Testing) operation: carry out UT (Ultrasonic Testing) to the whole plate of steel plate after expanding hydrogen according to corresponding non-destructive testing standard, steel plate inspection result can close EN10160 standard S3E4.
(9) heat treatment step: quenching temperature 900 DEG C, soaking time 2.0min/mm steel plate thickness (namely press the millimeter of steel plate thickness, every millimeter of heating calculates for two minutes); And be aided with quenching tank accelerating cooling; Tempering temperature 650 DEG C, soaking time 4.0min/mm steel plate thickness.
Gained steel plate has good comprehensive mechanical performance, steel plate yield strength 550MPa, tensile strength 630MPa ,-20 DEG C of impact of collision merit 110J, 108J, 123J, Z-direction performance 52%, 54%, 57%.
Embodiment 2: steel plate composition and the concrete technology of the production method of this quenching and tempering, high plate are as described below.
The steel grade S500Q/Z35 of the present embodiment, steel plate thickness is 260mm, and compression ratio is 3.65; Ingredients Weight percentage composition is: C 0.14%, Si 0.25%, Mn 0.95%, P 0.010%, S 0.005%, Ni 0.87%, Cr 0.42%, Mo 0.43%, Nb 0.023%, Ti 0.010%, TAl 0.020%, and surplus is Fe and inevitable impurity.
Processing step: (1) smelting procedure: by molten steel first through electrosmelting, sends into LF refining furnace refining and adjusting component, when liquid steel temperature reaches 1560 DEG C, proceeds to vacuum degassing furnace (VD stove) vacuum-treat; Add CaSi block before vacuum, nodularization is mingled with, vacuum tightness≤67Pa, destroys vacuum during 20 minutes vacuum hold-times.
(2) casting operation: the molten steel after smelting is cast; Esr raw material adopts continuous casting to produce, and superheating temperature is 23 DEG C, and throwing speed is 1.20m/min, and guarantees suitable secondary cooling water coupling.
(3) esr operation: by the strand of having cast according to schedule size make electrode, remove continuously cast bloom scale on surface; Adopt five yuan of slag system (CaO-MgO-Al
2o
3-SiO
2-CaF
2), add Al grain 25g/min; Select 960mm water mold to carry out remelting, average melting speed control, at 21kg/min, adopts air-cooled accelerating cooling.
(4) ESR ingot cleaning and stacking slow cooling operation: send steel rolling by the ESR ingot heat after remelting, the cleaning of band temperature, surface temperature 400 DEG C during cleaning, shove charge in time after cleaning.
(5) heating process: ESR ingot enters stove and boils in a covered pot over a slow fire steel 70min, then adopt low speed to burn steel, less than 1000 DEG C heat-up rates, 110 DEG C/h, maximum heating temperature 1230 DEG C, is then incubated 500min.
(6) rolling process: adopt II type controlled rolling; I stage rolling temperature is 930 DEG C, and single pass draught is 18%, and accumulative draft is 50%; II stage rolling temperature is 900 DEG C, and single pass draught is 27%, and accumulative draft is 27%, and finishing temperature 810 DEG C, rolls rear naturally cooling.
(7) annealing operation: steel plate is hung in burial pit and carry out the process of expansion hydrogen, surface of steel plate temperature 450 DEG C; Steel plate expands hydrogen treatment temp 615 DEG C in burial pit, guarantees warming and cooling rate 40 DEG C/h; Steel plate soaking time 75h; The total time inside furnace of steel plate 150 hours; Steel plate tapping temperature 175 DEG C, air cooling after coming out of the stove.
(8) UT (Ultrasonic Testing) operation: carry out UT (Ultrasonic Testing) to the whole plate of steel plate after expanding hydrogen according to corresponding non-destructive testing standard, steel plate inspection result can close EN10160 standard S3E4.
(9) heat treatment step: quenching temperature 870 DEG C, soaking time 2.0min/mm steel plate thickness; And be aided with quenching tank accelerating cooling; Tempering temperature 670 DEG C, soaking time 4.0min/mm steel plate thickness.
Gained steel plate has good comprehensive mechanical performance, steel plate yield strength 520MPa, tensile strength 590MPa ,-20 DEG C of impact of collision merit 150J, 205J, 172J, Z-direction performance 57%, 64%, 59%.
Embodiment 3: steel plate composition and the concrete technology of the production method of this quenching and tempering, high plate are as described below.
The steel grade S500Q/Z35 of the present embodiment, steel plate thickness is 260mm; Ingredients Weight percentage composition is: C 0.18%, Si 0.20%, Mn 1.12%, P 0.015%, S 0.004%, Ni 0.80%, Cr 0.56%, Mo 0.60%, Nb 0.041%, Ti 0.020%, TAl 0.045%, and surplus is Fe and inevitable impurity.
Except following difference, all the other processing steps are with embodiment 1:(1) smelting procedure: vacuum tightness≤62Pa, destroys vacuum during 30 minutes vacuum hold-times.
(3) esr operation: add Al grain 30g/min; Select 700mm water mold to carry out remelting, average melting speed control is at 18kg/min.
(5) heating process: ESR ingot enters stove and boils in a covered pot over a slow fire steel 50min, then adopt low speed to burn steel, less than 1000 DEG C heat-up rates, 120 DEG C/h, maximum heating temperature 1250 DEG C, is then incubated 350min.
(6) rolling process: I stage rolling temperature is 1100 DEG C, single pass draught is 10%, and accumulative draft is 40%; II stage rolling temperature is 810 DEG C, and single pass draught is 16%, and accumulative draft is 30%, finishing temperature 800 DEG C.
(7) annealing operation: surface of steel plate temperature 500 DEG C; Steel plate expands hydrogen treatment temp 610 DEG C in burial pit, guarantees warming and cooling rate 50 DEG C/h; Steel plate soaking time 72h; The total time inside furnace of steel plate 160 hours; Steel plate tapping temperature 150 DEG C.
(9) heat treatment step: quenching temperature 920 DEG C; Tempering temperature 620 DEG C.
Gained steel plate has good comprehensive mechanical performance, steel plate yield strength 515MPa, tensile strength 610MPa ,-20 DEG C of impact of collision merit 135J, 200J, 147J, Z-direction performance 56%, 63%, 58%.
Embodiment 4: steel plate composition and the concrete technology of the production method of this quenching and tempering, high plate are as described below.
The steel grade S500Q/Z35 of the present embodiment, steel plate thickness is 280mm; Ingredients Weight percentage composition is: C 0.15%, Si 0.50%, Mn 1.20%, P 0.008%, S 0.003%, Ni1.15%, Cr 0.40%, Mo 0.54%, Nb 0.050%, Ti 0.025%, TAl 0.040%, and surplus is Fe and inevitable impurity.
Except following difference, all the other processing steps are with embodiment 2:(3) esr operation: select 640mm water mold to carry out remelting, average melting speed control is at 20kg/min.
(6) rolling process: I stage rolling temperature is 1150 DEG C, single pass draught is 25%, and accumulative draft is 42%; II stage rolling temperature is 930 DEG C, and single pass draught is 13%, and accumulative draft is 20%.
(7) annealing operation: surface of steel plate temperature 460 DEG C; Steel plate expands hydrogen treatment temp 630 DEG C in burial pit, warming and cooling rate 45 DEG C/h; Steel plate soaking time 78h; The total time inside furnace of steel plate 175 hours.
(9) heat treatment step: quenching temperature 890 DEG C; Tempering temperature 690 DEG C.
Gained steel plate has good comprehensive mechanical performance, steel plate yield strength 503MPa, tensile strength 580MPa ,-20 DEG C of impact of collision merit 160J, 135J, 152J, Z-direction performance 56%, 63%, 56%.
Embodiment 5: steel plate composition and the concrete technology of the production method of this quenching and tempering, high plate are as described below.
The steel grade S500Q/Z35 of the present embodiment, steel plate thickness is 250mm; Ingredients Weight percentage composition is: C 0.16%, Si 0.42%, Mn 1.25%, P 0.013%, S 0.002%, Ni 0.96%, Cr 0.60%, Mo 0.40%, Nb 0.020%, Ti 0.017%, TAl 0.038%, and surplus is Fe and inevitable impurity.
Except following difference, all the other processing steps are with embodiment 1:(3) esr operation: select 760mm water mold to carry out remelting.
Gained steel plate has good comprehensive mechanical performance, steel plate yield strength 525MPa, tensile strength 598MPa ,-20 DEG C of impact of collision merit 176J, 187J, 163J, Z-direction performance 66%, 58%, 62%.
Claims (8)
1. the production method of a heavy thickness anti-lamellar tearing quenching and tempering, high plate, it is characterized in that: it comprises smelting, continuous casting, esr, heating, rolling, annealing and heat treatment step, the weight percentage of described steel plate chemical composition is: C 0.14% ~ 0.18%, Si 0.20% ~ 0.50%, Mn 0.95% ~ 1.25%, P≤0.015%, S≤0.005%, Ni 0.80% ~ 1.15%, Cr 0.40% ~ 0.60%, Mo 0.40% ~ 0.60%, Nb 0.020% ~ 0.050%, Ti 0.010% ~ 0.030%, TAl 0.020% ~ 0.045%, surplus is Fe and inevitable impurity.
2. the production method of heavy thickness according to claim 1 anti-lamellar tearing quenching and tempering, high plate, is characterized in that, described smelting procedure: molten steel first through electrosmelting, then is sent in LF refining furnace and carried out refining, then proceeds to vacuum degassing furnace and carries out vacuum-treat; Described vacuum treated vacuum tightness≤67Pa and hold-time are not less than 20min.
3. the production method of heavy thickness according to claim 1 anti-lamellar tearing quenching and tempering, high plate, it is characterized in that, described esr operation: carry out esr after strand being made electrode, adopt five yuan of slag systems, crystallizer comprises 640mm, 700mm, 760mm and 960mm tetra-kinds of optional sections, average molten speed≤22kg/min, per minute adds Al grain 25 ~ 30g/ steel per ton, adopts air-cooled accelerating cooling.
4. the production method of heavy thickness according to claim 1 anti-lamellar tearing quenching and tempering, high plate, it is characterized in that, described heating process: ESR ingot enters stove and boils in a covered pot over a slow fire steel 50 ~ 70min, then low speed is adopted to burn steel, less than 1000 DEG C heat-up rates, 100 ~ 120 DEG C/h, maximum heating temperature 1240 ± 10 DEG C, is then incubated 350 ~ 500min.
5. the production method of heavy thickness according to claim 1 anti-lamellar tearing quenching and tempering, high plate, it is characterized in that, described rolling process adopts II type controlled rolling: I stage rolling temperature is 930 ~ 1100 DEG C, and single pass draught is 10% ~ 25%, and accumulative draft is 40% ~ 50%; II stage rolling temperature is 810 ~ 930 DEG C, and single pass draught is 10% ~ 27%, and accumulative draft is 20% ~ 30%, and finishing temperature 810 ± 10 DEG C, rolls rear naturally cooling.
6. the production method of heavy thickness according to claim 1 anti-lamellar tearing quenching and tempering, high plate, is characterized in that, described annealing operation: described steel plate carries out the process of expansion hydrogen at burial pit, surface of steel plate temperature >=450 DEG C; Steel plate expands hydrogen treatment temp 620 ± 10 DEG C in burial pit, guarantees that warming and cooling rate is not more than 50 DEG C/h; Steel plate soaking time is not less than 72h; Steel plate tapping temperature≤200 DEG C, air cooling after coming out of the stove.
7. the production method of heavy thickness according to claim 6 anti-lamellar tearing quenching and tempering, high plate, is characterized in that: in described annealing operation, the total time inside furnace of steel plate is not less than 150 hours.
8. the production method of the anti-lamellar tearing quenching and tempering, high of the heavy thickness according to claim 1-7 any one plate, is characterized in that, described heat treatment step: quenching temperature 870 ~ 920 DEG C, soaking time 2.0min/mm steel plate thickness, cooling process after quenching; Tempering temperature 620 ~ 690 DEG C, soaking time 4.0min/mm steel plate thickness.
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|---|---|---|---|
| CN201510032187.8A CN104674130A (en) | 2015-01-22 | 2015-01-22 | Method for producing large-thickness lamination-crack-resistant tempered high-strength steel plate |
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| CN104988422A (en) * | 2015-07-29 | 2015-10-21 | 舞阳钢铁有限责任公司 | Extremely-thick hardening and tempering high-strength steel plate for water and electricity 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 |
| CN107267848A (en) * | 2017-05-26 | 2017-10-20 | 舞阳钢铁有限责任公司 | One kind reduces that electroslag becomes a useful person Cr Mo steel crackles and edge bursts method |
| CN108359905A (en) * | 2018-04-23 | 2018-08-03 | 舞阳钢铁有限责任公司 | A kind of electroslag is become a useful person quenched water power steel plate and its production method |
| CN109023099A (en) * | 2018-09-19 | 2018-12-18 | 舞阳钢铁有限责任公司 | A kind of quenching and tempering type water power big thickness low alloy high strength steel plate and its production method |
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| CN110512089A (en) * | 2019-08-20 | 2019-11-29 | 舞阳钢铁有限责任公司 | The preparation method of high temperature resistant 3Cr-1Mo-0.25V alloy-steel plate |
| CN116479309A (en) * | 2023-04-04 | 2023-07-25 | 福建鼎盛钢铁有限公司 | Process for producing 400MPa grade weathering steel based on electric furnace sheet billet endless rolling |
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| CN104988422A (en) * | 2015-07-29 | 2015-10-21 | 舞阳钢铁有限责任公司 | Extremely-thick hardening and tempering high-strength steel plate for water and electricity 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 |
| CN107267848A (en) * | 2017-05-26 | 2017-10-20 | 舞阳钢铁有限责任公司 | One kind reduces that electroslag becomes a useful person Cr Mo steel crackles and edge bursts method |
| CN108359905A (en) * | 2018-04-23 | 2018-08-03 | 舞阳钢铁有限责任公司 | A kind of electroslag is become a useful person quenched water power steel plate and its production method |
| CN109023099A (en) * | 2018-09-19 | 2018-12-18 | 舞阳钢铁有限责任公司 | A kind of quenching and tempering type water power big thickness low alloy high strength steel plate and its production method |
| CN109355568A (en) * | 2018-11-27 | 2019-02-19 | 汪杨志 | A kind of high-strength tenacity and good welds mining machinery steel and its production method |
| CN109881092A (en) * | 2019-02-26 | 2019-06-14 | 舞阳钢铁有限责任公司 | A kind of big thickness rack steel plate and its production method |
| CN110512089A (en) * | 2019-08-20 | 2019-11-29 | 舞阳钢铁有限责任公司 | The preparation method of high temperature resistant 3Cr-1Mo-0.25V alloy-steel plate |
| CN110512089B (en) * | 2019-08-20 | 2021-06-22 | 舞阳钢铁有限责任公司 | Preparation method of high-temperature-resistant 3Cr-1Mo-0.25V alloy steel plate |
| CN116479309A (en) * | 2023-04-04 | 2023-07-25 | 福建鼎盛钢铁有限公司 | Process for producing 400MPa grade weathering steel based on electric furnace sheet billet endless rolling |
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