CN108359879A - A kind of DQ-T methods no more than 1000MPa grades of water-power steel plates of 60mm thickness - Google Patents

A kind of DQ-T methods no more than 1000MPa grades of water-power steel plates of 60mm thickness Download PDF

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CN108359879A
CN108359879A CN201810141250.5A CN201810141250A CN108359879A CN 108359879 A CN108359879 A CN 108359879A CN 201810141250 A CN201810141250 A CN 201810141250A CN 108359879 A CN108359879 A CN 108359879A
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water
steel
rolling
steel plates
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CN108359879B (en
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李长生
陈洁
涂兴洋
金鑫
陈礼清
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Nanjing Iron And Steel Ltd By Share Ltd
Northeastern University China
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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C33/00—Making ferrous alloys
    • C22C33/04—Making ferrous alloys by melting
    • 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
    • C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
    • 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
    • C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
    • 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
    • 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
    • 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
    • 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
    • C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
    • 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
    • C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
    • 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
    • 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
    • C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
    • 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
    • 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
    • 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
    • C22C38/54—Ferrous alloys, e.g. steel alloys containing chromium with nickel with boron
    • 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
    • C21D2211/00—Microstructure comprising significant phases
    • 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
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/008—Martensite

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  • Heat Treatment Of Steel (AREA)

Abstract

The invention discloses a kind of DQ T methods no more than 1000MPa grades of water-power steel plates of 60mm thickness, the chemical compositions of the steel plate：C 0.09~0.18%, Mn 0.80~1.60%, P≤0.01%, S≤0.002%, Si≤0.40%, Ni 0.9~2.6%, Cr≤0.75%, Cu≤0.20%, Alt≤0.10%, Nb≤0.06%, Mo 0.3~0.65%, V≤0.12%, Ti≤0.06%, B≤0.003%, surplus Fe.It is smelted by set component, two-phase control rolling, rolls rear direct quenching, last offline tempering, obtains the microscopic structure of tempered sorbite+a small amount of tempered martensite, and intensity, plasticity and low-temperature impact toughness are excellent and match, and there is good welding performance, welding cold cracking Sensitivity Index Pcm≤ 0.29%.

Description

A kind of DQ-T methods no more than 1000MPa grades of water-power steel plates of 60mm thickness
Technical field
It is the invention belongs to metallurgical technology field, more particularly to a kind of no more than 1000MPa grades of water-power steel plates of 60mm thickness DQ-T production methods.
Background technology
Currently, the tensile strength of water-power steel plate develops to 1000MPa grades of direction.In general, water-power steel plate Thickness specification is 10~100mm.With the increase of thickness specification, the microstructure and its mechanical property of steel plate are difficult to control and protect Card.Therefore, it is necessary to for different thickness specifications from composition design, processing route control etc. proof strength and ballistic work etc. Mechanical performance index.
Application No. is 201310269680.2 patent propose a kind of 800MPa grades of hydropower station pressure pipeline high strength steel plate and Production method can produce the steel plate of thickness specification≤60mm.Using two-phase control rolling, Controlled cooling process is used after rolling, it is cooling Rate is 7~15 DEG C/s, and finally progress quenching+tempering heat treatment, yield strength >=690MPa of the steel plate obtained, tension are strong Spend 780~870MPa, 40 DEG C of ballistic work >=47J of ﹣.
Application No. is a kind of ultrafine crystal bainite high-strength steels of 200910046581.1 patent proposition and preparation method thereof, can Produce the steel plate of thickness specification≤60mm, welding cold cracking Sensitivity Index Pcm≤ 0.20%.It is rolled using two-stage control, after rolling 400~480 DEG C are cooled to the speed of 15~30 DEG C/s, room temperature is air-cooled to after water outlet.Finally, the yield strength ＞ of steel plate 20 DEG C of ballistic work >=120J of 690MPa, tensile strength 780~930MPa, ﹣.
But above-mentioned patented method production is not more than 60mm steel plates, intensity and low-temperature impact toughness cannot be satisfied The mechanical property requirements of 1000MPa grades of water-power steels.
Invention content
The object of the present invention is to provide a kind of DQ-T production methods no more than 1000MPa grades of water-power steel plates of 60mm thickness. DQ-T production methods refer to steel plate direct quenching (DQ) to room temperature after two-phase control rolling, using tempering (T) process of thermal treatment Method.
In order to reach object above, the technical scheme is that：
The present invention provides a kind of DQ-T production methods no more than 1000MPa grades of water-power steel plates of 60mm thickness, by following step It is rapid to carry out：
(1) according to the chemical composition smelting molten steel of design and it is casting continuously to form slab, ingredient is by weight percentage：C 0.09 ~0.18%, Mn 0.80~1.60%, P≤0.01%, S≤0.002%, Si≤0.4%, Ni 0.90~2.60%, Cr≤ 0.75%, Cu≤0.20%, Alt≤0.10%, Nb≤0.06%, Mo 0.30~0.65%, V≤0.12%, Ti≤ 0.06%, B≤0.003%, surplus Fe；
(2) by heating of plate blank to 1200~1250 DEG C, total 300~400min of heating time, dephosphorization after coming out of the stove, then carry out two Stage control rolls, and wherein the start rolling temperature of roughing is 1140~1170 DEG C, and finishing temperature is 980~1040 DEG C, rolling pass It is 5~8, total reduction is 63~81%；The start rolling temperature of finish rolling is 860~920 DEG C, and finishing temperature is 800~840 DEG C, is rolled Passage processed is 3~6, and total reduction is 45~85%；Carry out the steel plate that smooth acquisition thickness is not more than 60mm again later；
(3) for the steel plate water cooling after controlled rolling to room temperature, cooling rate is 20~50 DEG C/s；
(4) by the steel plate after controlled rolling and controlled cooling in 610~700 DEG C of offline tempering, tempering time is 60~180min, Zhi Houkong It is cooled to room temperature.
According to technical solution above, in the case of preferred, thickness of strand described in step (1) is 320mm.
According to technical solution above, in the case of preferred, smooth described in step (2) is that a time is smooth.
Tempering insulation time (T, min) and steel plate thickness (t, mm) relationship described in step (4) are T=2*t+50.
The invention further relates to be not more than 1000MPa grades of water-power steel plates of 60mm thickness using above method production.
Continuous casting billet obtains lath martensite tissue, is obtained by tempering heat treatment after two-phase control rolling and direct quenching Tempered sorbite+a small amount of tempered martensite.
By the calculating and optimization to material chemical composition, and rolling, cooling and modifier treatment technique optimization, finally The 1000MPa grade water-power steel plates that thickness specification is not more than 60mm are obtained, mechanical performance index is as follows：Yield strength (transverse direction) >=885MPa, tensile strength (transverse direction) are 950~1130MPa, elongation percentage (transverse direction) >=60 DEG C of 15%, ﹣ V-type ballistic works (transverse direction) ≥100J.Meanwhile welding cold crack sensitivity Pcm≤ 0.29%.
What the present invention obtained is a kind of 1000MPa grades of low-welding crack-sensitive water-power steel plate, Design of Chemical Composition It considers some：
C is the important element in steel, content number the performance of steel is influenced it is very big.With the increase of carbon content, steel Intensity and hardness improve, but its plasticity and toughness reduce, and the ductile-brittle transition temperature of steel is made to increase.It is higher in welding carbon content When steel, welding heat affected zone is susceptible to phenomenon of hardening, and the tendency of cold crack is generated when aggravation is welded.In view of 1000MPa The welding performance and low-temperature impact toughness of grade water-power steel, carbon content should be controlled 0.09~0.18% in steel.
Mn can reduce austenite to ferrite transformation temperature, to expand austenite phase field.With the increase of Mn contents, The quenching degree and intensity of steel improve, while carbon equivalent increases, and influences welding performance.Mn too high levels can aggravate the center of slab Segregation, influences the low-temperature impact toughness of steel.Therefore, Mn contents should be controlled 0.80~1.60%.
Si can improve the intensity and hardness of steel, and with the increase of silicone content, the quenching degree of steel increases.Since silicon can make steel It generates free carbon and is graphitized, the plasticity of steel and welding performance is caused to reduce.During Large Heat Input Welding, silicon aggravation is coarse And the formation on the non-uniform islands M-A, seriously affect the low-temperature impact toughness of heat affected area.Therefore, Si contents should≤0.40%.
Ni can improve austenite phase field, reduce austenite transformation temperature, to which austenite is obstructed to perlitic transformation, promote Make to generate martensite in steel, the position increased between martensite and ferrite differs, and crackle passes through the resistance of martensite to increase, and improves The low-temperature impact toughness of steel.But Ni is expensive, considers the low-temperature impact toughness and production cost of steel, Ni contents are answered When control is 0.9~2.6%.
Cr promotes the overcooling austenite continuous cooling transformation (CCT) diagram of steel to move to right, and increases the quenching degree of steel, while refining martensite Piece spacing, to improve the intensity of steel.Meanwhile the position that Cr can increase between martensite and ferrite differs, to a certain extent Improve the low-temperature impact toughness of steel.But as Cr contents increase, it is also easy to produce welding cold cracking in welding process, damages steel Welding performance.Therefore, Cr contents should≤0.75%.
Cu does not have an effect in steel with carbon, and two kinds of elements cannot dissolve each other, so copper is mainly plain in iron in mild steel It dissolves or precipitates in body, generate slight precipitation enhancement.In drawing process, ε-Cu generate precipitation strength effect, still Copper content is excessively high, and the toughness and welding performance of steel decline.Meanwhile copper can improve the weather-resistance of steel.Therefore, Cu contains Amount should≤0.20%.
Al has the function of deoxidation in steel, while adding a small amount of aluminium can be with crystal grain thinning, to improve the intensity of steel And impact flexibility.But aluminium content is excessively high, it will influences hot-working character, the welding performance and cutting performance of steel.Cause This, Al content should≤0.10%.
Mo can improve the quenching degree of steel, to overcome through-thickness to a certain extent due to cooling and deform uneven The structure property problem of non-uniform brought.The intensity, toughness of steel is improved with the increase of molybdenum content, and yield tensile ratio is with molybdenum content Increase and reduce.In quenched and tempered steel, molybdenum can improve steel belt roof bolt stability, and the tempering Soxhlet of fine grain is obtained after quenched Body so that obdurability is improved.In low-alloy steel, microalloy member also can be improved other than promoting phase transformation strengthening effect in molybdenum Solid solubility of the element in austenite, forces more microalloy elements to be precipitated from ferrite at a lower temperature, generates stronger Precipitation enhancement.Therefore, the content of Mo should be controlled 0.30~0.65%.
B belongs to the trace element in steel, and suitable boron, which is added, can improve the compactness of steel, improve hot rolling performance, simultaneously The quenching degree of steel can be significantly improved, but excessive boron, which is added, can influence the toughness and welding performance of steel.Therefore, B content is answered When≤0.003%.
Nb, V and Ti are common micro alloying elements in low-alloy steel, they can inhibit Ovshinsky in hot procedure The Deformation recrystallization of body simultaneously prevents crystal grain from growing up, and can also be produced by the strain induced precipitate of the carboritride of Nb, V and Ti Raw precipitation enhancement.Wherein, there is Nb strongest grain refining strengthening effect, V to have in three strongest in three Precipitation enhancement.
P and S is the harmful element in steel, therefore strictly to control the content of two kinds of elements.Phosphorus is inclined in steel process of setting It analyses between crystal grain, forms high phosphorus brittle layer, keep the local organization of steel abnormal, reduce the plasticity and toughness of steel, make intercrystalline cracking Stress reduces, and ductile-brittle transition temperature rises, and causes cold short, compromises the welding performance of steel.Sulphur can form low melting point in steel FeS eutectics generate hot-short phenomenon.Sulphur can also form sulfide with some other element, with bar form along rolling direction Distribution forms banded structure, destroys the continuity of material, is reduced to the plasticity and impact flexibility of steel.Therefore, the content of P Should≤content of 0.01%, S should≤0.002%.
Compare with the existing technology of the present invention has the advantages that notable and good effect：
(1) Design of Chemical Composition of low-carbon and low-alloy not only reduces production cost, and significantly reduce carbon equivalent and Welding cold crack sensitivity index obtains high-quality pure continuous casting billet by the smelting of low-sulfur phosphorus clean steel；
(2) it using rear quickly water cooling is rolled to the control type of cooling of room temperature, i.e. direct quenching technique, is omitted and adds again offline Hot-quenching ignition technique saves energy consumption to be effectively shortened technological process, reduces production cost；
(3) being rushed no more than 1000MPa grades of water-power steel plate intensity of 60mm thickness, plasticity and low temperature for DQ-T methods production is used Good-toughness and matching are hit, mechanical performance index is as follows：Yield strength (transverse direction) >=885MPa, tensile strength (transverse direction) are 950~1130MPa, elongation percentage (transverse direction) >=60 DEG C of 15%, ﹣ V-type ballistic works (transverse direction) >=100J, and there is good weldability Can, welding cold crack sensitivity Pcm≤ 0.29%.
Description of the drawings
Fig. 1 is 1 steel plate controlled rolling and controlled cooling of the embodiment of the present invention treated microscopic structure；
Fig. 2 is 1 steel plate hot of the embodiment of the present invention treated microscopic structure.
Specific implementation mode
Following nonlimiting examples can make those skilled in the art be more fully understood the present invention, but not with Any mode limits the present invention.
Hot rolling is to utilize 4700mm four-high mills in the embodiment of the present invention；Using Leica DMIRM types light microscopes and 600 type scanning electron microscope of FEI Quanta observes microscopic structure；Circular cross-section standard is made according to GB/T2975-1998 Tensile sample carries out room-temperature mechanical property test on CMT5105-SANS microcomputer controlled electronic universal testing machines；Charpy pendulu Formula impact experiment is 10mm × 10mm × 55mm in 60 DEG C of progress of ﹣, specimen size.
Embodiment 1
By set component smelting molten steel and thickness is casting continuously to form as 320mm slabs, and ingredient is C by weight percentage 0.1031%, Mn 1.1501%, P 0.0075%, S 0.001%, Si 0.2487%, Ni 1.2502%, Cr 0.375%, Cu 0.0124%, Alt 0.0301%, Nb 0.0241%, Mo 0.3693%, V 0.04%, Ti 0.0136%, B 0.0015%, surplus Fe；
By heating of plate blank to 1200 DEG C, heating time 360min, high pressure water dephosphorization is utilized later, then carry out 8 passage roughing, Start rolling temperature is 1165 DEG C, and finishing temperature is 1025 DEG C, total reduction 79.69%；The start rolling temperature of finish rolling is 890 DEG C, eventually It is 839 DEG C to roll temperature, and rolling pass 4, total reduction 63.08%, steel plate thickness is 24mm after finish rolling, carries out one again later Passage is smooth, and water cooling is cooled to room temperature with the speed of 35 DEG C/s after hot rolling.Steel plate controlled rolling and controlled cooling treated microscopic structure such as Shown in Fig. 1, tissue is mainly lath martensite；
By steel plate in 630 DEG C of high temperings, it is thick to obtain the excellent 24mm of comprehensive mechanical property by tempering time 100min 1000MPa grades of water-power steel plates：Yield strength (transverse direction) is 990MPa, and tensile strength (transverse direction) is 1011MPa, elongation after fracture (transverse direction) 18.5%；﹣ 60 DEG C of V-type ballistic works (transverse direction) 197J, welding cold crack sensitivity Pcm=0.25%.Steel plate is being heat-treated Microscopic structure afterwards is as shown in Fig. 2, tissue is mainly tempered sorbite and a small amount of tempered martensite.
Embodiment 2
By set component smelting molten steel and thickness is casting continuously to form as 320mm slabs, and ingredient is C by weight percentage 0.114%, Mn 0.9418%, P 0.0077%, S 0.0014%, Si 0.2487%, Ni 1.4338%, Cr 0.4825%, Cu 0.0136%, Alt 0.0301%, Nb 0.0251%, Mo 0.4739%, V 0.0428%, Ti 0.0152%, B 0.0016%, surplus Fe；
By heating of plate blank to 1220 DEG C, heating time 350min, high pressure water dephosphorization is utilized later, then carry out 8 passage roughing, Start rolling temperature is 1158 DEG C, and finishing temperature is 1036 DEG C, total reduction 79.69%；The start rolling temperature of finish rolling is 905 DEG C, eventually It is 846 DEG C to roll temperature, and rolling pass 4, total reduction 63.08%, steel plate thickness is 24mm after finish rolling, carries out one again later Passage is smooth.Water cooling cools down room temperature with the speed of 40 DEG C/s after hot rolling；
By steel plate in 630 DEG C of high temperings, it is thick to obtain the excellent 24mm of comprehensive mechanical property by tempering time 100min 1000MPa grades of water-power steel plates：Yield strength (transverse direction) is 1023MPa, and tensile strength (transverse direction) is 1035MPa, elongation of having no progeny Rate (transverse direction) 16.5%；﹣ 60 DEG C of V-type ballistic works (transverse direction) 118J, welding cold crack sensitivity Pcm=0.26%.
Embodiment 3
By set component smelting molten steel and thickness is casting continuously to form as 320mm slabs, and ingredient is C by weight percentage 0.114%, Mn 0.9418%, P 0.0077%, S 0.0014%, Si 0.2487%, Ni 1.4338%, Cr 0.4825%, Cu 0.0136%, Alt 0.0301%, Nb 0.0251%, Mo 0.4739%, V 0.0428%, Ti 0.0152%, B 0.0016%, surplus Fe；
By heating of plate blank to 1200 DEG C, heating time 360min, high pressure water dephosphorization is utilized later, then carry out 6 passage roughing, Start rolling temperature is 1165 DEG C, and finishing temperature is 1038 DEG C, total reduction 63.33%；The start rolling temperature of finish rolling is 887 DEG C, eventually It is 831 DEG C to roll temperature, and rolling pass 4, total reduction 56.36%, steel plate thickness is 48mm after finish rolling, carries out one again later Passage is smooth.Water cooling is cooled to room temperature with the speed of 30 DEG C/s after hot rolling；
By steel plate in 630 DEG C of high temperings, it is thick to obtain the excellent 48mm of comprehensive mechanical property by tempering time 150min 1000MPa grades of water-power steel plates：Yield strength (transverse direction) is 986MPa, and tensile strength (transverse direction) is 1008MPa, elongation after fracture (transverse direction) 17.0%；﹣ 60 DEG C of V-type ballistic works (transverse direction) 165J, welding cold crack sensitivity Pcm=0.26%.
Embodiment 4
By set component smelting molten steel and thickness is casting continuously to form as 320mm slabs, and ingredient is C by weight percentage 0.1223%, Mn 1.2037%, P 0.0088%, S 0.0011%, Si 0.3237%, Ni 1.3777%, Cr 0.3365%, Cu 0.0103%, Alt 0.041%, Nb 0.0136%, Mo 0.3767%, V 0.0335%, Ti 0.0152%, B 0.0015%, surplus Fe；
By heating of plate blank to 1200 DEG C, heating time 360min, high pressure water dephosphorization is utilized later, then carry out 6 passage roughing, Start rolling temperature is 1160 DEG C, and finishing temperature is 996 DEG C, total reduction 65.63%；The start rolling temperature of finish rolling is 860 DEG C, finish to gauge Temperature is 820 DEG C, and rolling pass 4, total reduction 56.36%, steel plate thickness is 48mm after finish rolling, is carried out again later together It is secondary smooth.Water cooling is cooled to room temperature with the speed of 30 DEG C/s after hot rolling；
By steel plate in 630 DEG C of high temperings, it is thick to obtain the excellent 48mm of comprehensive mechanical property by tempering time 150min 1000MPa grades of water-power steel plates：Yield strength (transverse direction) is 938MPa, and tensile strength (transverse direction) is 981MPa, elongation after fracture (transverse direction) 16.5%；﹣ 60 DEG C of V-type ballistic works (transverse direction) 120J, welding cold crack sensitivity Pcm=0.27%.
Embodiment 5
By set component smelting molten steel and thickness is casting continuously to form as 320mm slabs, and ingredient is C by weight percentage 0.1223%, Mn 1.2037%, P 0.0088%, S 0.0011%, Si 0.3237%, Ni 1.3777%, Cr 0.3365%, Cu 0.0103%, Alt 0.041%, Nb 0.0136%, Mo 0.3767%, V 0.0335%, Ti 0.0152%, B 0.0015%, surplus Fe；
By heating of plate blank to 1200 DEG C, heating time 360min, high pressure water dephosphorization is utilized later, then carry out 6 passage roughing, Start rolling temperature is 1130 DEG C, and finishing temperature is 1022 DEG C, total reduction 63.33%；The start rolling temperature of finish rolling is 920 DEG C, eventually It is 840 DEG C to roll temperature, and rolling pass 4, total reduction 56.36%, steel plate thickness is 48mm after finish rolling, carries out one again later Passage is smooth.Water cooling is cooled to room temperature with the speed of 37 DEG C/s after hot rolling；
By steel plate in 690 DEG C of high temperings, it is thick to obtain the excellent 48mm of comprehensive mechanical property by tempering time 60min 1000MPa grades of water-power steel plates：Yield strength (transverse direction) is 940MPa, and tensile strength (transverse direction) is 975MPa, elongation after fracture (transverse direction) 16.8%；﹣ 60 DEG C of V-type ballistic works (transverse direction) 142J, welding cold crack sensitivity Pcm=0.27%.
Embodiment 6
By set component smelting molten steel and thickness is casting continuously to form as 320mm slabs, and ingredient is C by weight percentage 0.1223%, Mn 1.2037%, P 0.0088%, S 0.0011%, Si 0.3237%, Ni 1.3777%, Cr 0.3365%, Cu 0.0103%, Alt 0.041%, Nb 0.0136%, Mo 0.3767%, V 0.0335%, Ti 0.0152%, B 0.0015%, surplus Fe；
By heating of plate blank to 1200 DEG C, heating time 360min, high pressure water dephosphorization is utilized later, then carry out 5 passage roughing, Start rolling temperature is 1140 DEG C, and finishing temperature is 1035 DEG C, total reduction 63.33%；The start rolling temperature of finish rolling is 910 DEG C, eventually It is 825 DEG C to roll temperature, and rolling pass 3, total reduction 45.45%, steel plate thickness is 60mm after finish rolling, carries out one again later Passage is smooth.Water cooling cools down room temperature with the speed of 30 DEG C/s after hot rolling；
By steel plate in 690 DEG C of high temperings, it is thick to obtain the excellent 60mm of comprehensive mechanical property by tempering time 60min 1000MPa grades of water-power steel plates：Yield strength (transverse direction) is 945MPa, and tensile strength (transverse direction) is 1000MPa, elongation after fracture (transverse direction) 17.2%；﹣ 60 DEG C of V-type ballistic works (transverse direction) 117J, welding cold crack sensitivity Pcm=0.27%.
In addition to the implementation, the present invention can also have other embodiment.It is all to use equivalent substitution or equivalent transformation shape At technical solution, fall within the scope of protection required by the present invention.

Claims (5)

1. a kind of DQ-T methods no more than 1000MPa grades of water-power steel plates of 60mm thickness, which is characterized in that according to the following steps into Row：
(1) according to the chemical composition smelting molten steel of design and it is casting continuously to form slab, ingredient is by weight percentage：C 0.09~ 0.18%, Mn 0.80~1.60%, P≤0.01%, S≤0.002%, Si≤0.4%, Ni 0.90~2.60%, Cr≤ 0.75%, Cu≤0.20%, Alt≤0.10%, Nb≤0.06%, Mo 0.30~0.65%, V≤0.12%, Ti≤ 0.06%, B≤0.003%, surplus Fe；
(2) by heating of plate blank to 1200~1250 DEG C, 300~400min of heating time, high pressure water dephosphorization is carried out later, then carry out Two-stage control rolls, and wherein the start rolling temperature of roughing is 1140~1170 DEG C, and finishing temperature is 980~1040 DEG C, rolls road Secondary is 5~8, and total reduction is 63~81%；The start rolling temperature of finish rolling is 860~920 DEG C, and finishing temperature is 800~840 DEG C, Rolling pass is 3~6, and total reduction is 45~85%；Carry out smooth, steel plate of the acquisition thickness no more than 60mm again later；
(3) for the steel plate water cooling after controlled rolling to room temperature, cooling rate is 20~50 DEG C/s；
(4) by the steel plate after controlled rolling and controlled cooling in 610~700 DEG C of offline tempering, tempering time is 60~180min, is air-cooled to later Room temperature.
2. the DQ-T methods according to claim 1 no more than 1000MPa grades of water-power steel plates of 60mm thickness, feature exists In thickness of strand described in step (1) is 320mm.
3. the DQ-T methods according to claim 1 no more than 1000MPa grades of water-power steel plates of 60mm thickness, feature exists In smooth described in step (4) is that a time is smooth.
4. the method as described in claim 1 production is not more than 1000MPa grades of water-power steel plates of 60mm thickness.
5. according to claim 4 be not more than 1000MPa grades of water-power steel plates of 100mm thickness, which is characterized in that its mechanical property Energy index is as follows：Yield strength >=885MPa, tensile strength are 950~1130MPa, the 60 DEG C of V-type impacts of elongation percentage >=15%, ﹣ Work(>=100J；Welding cold crack sensitivity P simultaneouslycm≤ 0.29%.
CN201810141250.5A 2018-02-11 2018-02-11 DQ-T method of 1000 MPa-grade hydroelectric steel plate with thickness not greater than 60mm Expired - Fee Related CN108359879B (en)

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CN113388775A (en) * 2021-06-03 2021-09-14 南京钢铁股份有限公司 Production method of 1000 MPa-grade high-strength steel plate for hydroelectric engineering
CN113549827A (en) * 2021-07-13 2021-10-26 鞍钢股份有限公司 FH690 grade marine steel with excellent low-temperature toughness and manufacturing method thereof
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