CN105779899A - 800 MPa-level high-strength-tenacity steel plate used for engineering machine in extremely cold environment and manufacturing method for 800 MPa-level high-strength-tenacity steel plate - Google Patents
800 MPa-level high-strength-tenacity steel plate used for engineering machine in extremely cold environment and manufacturing method for 800 MPa-level high-strength-tenacity steel plate Download PDFInfo
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 84
- 239000010959 steel Substances 0.000 title claims abstract description 84
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 19
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 16
- OKTJSMMVPCPJKN-UHFFFAOYSA-N carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 12
- 239000000126 substance Substances 0.000 claims abstract description 6
- 239000012535 impurity Substances 0.000 claims abstract description 4
- 238000005096 rolling process Methods 0.000 claims description 28
- 238000001816 cooling Methods 0.000 claims description 24
- 238000000034 method Methods 0.000 claims description 22
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 19
- 238000010791 quenching Methods 0.000 claims description 17
- 230000000171 quenching Effects 0.000 claims description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 15
- 206010044565 Tremor Diseases 0.000 claims description 14
- 239000007921 spray Substances 0.000 claims description 14
- 238000010438 heat treatment Methods 0.000 claims description 13
- 238000001953 recrystallisation Methods 0.000 claims description 13
- 238000007689 inspection Methods 0.000 claims description 12
- 229910052698 phosphorus Inorganic materials 0.000 claims description 12
- 238000007670 refining Methods 0.000 claims description 12
- 238000003723 Smelting Methods 0.000 claims description 11
- 229910052717 sulfur Inorganic materials 0.000 claims description 11
- 229910052742 iron Inorganic materials 0.000 claims description 10
- 239000004568 cement Substances 0.000 claims description 9
- 238000010583 slow cooling Methods 0.000 claims description 9
- OAICVXFJPJFONN-UHFFFAOYSA-N phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 8
- 239000011574 phosphorus Substances 0.000 claims description 8
- 230000001603 reducing Effects 0.000 claims description 8
- 238000005070 sampling Methods 0.000 claims description 8
- 229910001566 austenite Inorganic materials 0.000 claims description 7
- 238000006722 reduction reaction Methods 0.000 claims description 7
- 239000000203 mixture Substances 0.000 claims description 6
- NINIDFKCEFEMDL-UHFFFAOYSA-N sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 6
- 239000011593 sulfur Substances 0.000 claims description 6
- 238000009966 trimming Methods 0.000 claims description 6
- 238000009749 continuous casting Methods 0.000 claims description 5
- 238000005204 segregation Methods 0.000 claims description 5
- 239000002893 slag Substances 0.000 claims description 5
- 241001062472 Stokellia anisodon Species 0.000 claims description 4
- 230000001133 acceleration Effects 0.000 claims description 4
- 239000011324 bead Substances 0.000 claims description 4
- 238000006477 desulfuration reaction Methods 0.000 claims description 4
- 238000002844 melting Methods 0.000 claims description 4
- 238000005452 bending Methods 0.000 claims description 3
- 238000005266 casting Methods 0.000 claims description 3
- 229910052804 chromium Inorganic materials 0.000 claims description 3
- 229910052739 hydrogen Inorganic materials 0.000 claims description 3
- 230000014759 maintenance of location Effects 0.000 claims description 3
- 229910052750 molybdenum Inorganic materials 0.000 claims description 3
- 229910052758 niobium Inorganic materials 0.000 claims description 3
- 229910052757 nitrogen Inorganic materials 0.000 claims description 3
- 229910052760 oxygen Inorganic materials 0.000 claims description 3
- 230000000505 pernicious Effects 0.000 claims description 3
- 238000005480 shot peening Methods 0.000 claims description 3
- 238000005507 spraying Methods 0.000 claims description 3
- 229910014458 Ca-Si Inorganic materials 0.000 claims description 2
- 229910018619 Si-Fe Inorganic materials 0.000 claims description 2
- 229910008289 Si—Fe Inorganic materials 0.000 claims description 2
- 229910052748 manganese Inorganic materials 0.000 claims description 2
- 230000004048 modification Effects 0.000 claims description 2
- 238000006011 modification reaction Methods 0.000 claims description 2
- 238000005496 tempering Methods 0.000 claims description 2
- 229940105648 Soma Drugs 0.000 claims 1
- 238000009413 insulation Methods 0.000 claims 1
- 229910045601 alloy Inorganic materials 0.000 abstract description 5
- 239000000956 alloy Substances 0.000 abstract description 5
- REDXJYDRNCIFBQ-UHFFFAOYSA-N aluminium(3+) Chemical class [Al+3] REDXJYDRNCIFBQ-UHFFFAOYSA-N 0.000 abstract description 5
- 238000003466 welding Methods 0.000 abstract description 5
- 238000005516 engineering process Methods 0.000 description 9
- 230000000694 effects Effects 0.000 description 4
- 238000002791 soaking Methods 0.000 description 4
- 238000005275 alloying Methods 0.000 description 3
- 238000007664 blowing Methods 0.000 description 3
- 238000010276 construction Methods 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 238000004781 supercooling Methods 0.000 description 3
- -1 at stove 40min Inorganic materials 0.000 description 2
- 230000003009 desulfurizing Effects 0.000 description 2
- 238000007730 finishing process Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 229910017083 AlN Inorganic materials 0.000 description 1
- 229910017262 Mo—B Inorganic materials 0.000 description 1
- 229910000746 Structural steel Inorganic materials 0.000 description 1
- PIGFYZPCRLYGLF-UHFFFAOYSA-N aluminum nitride Chemical compound [Al]#N PIGFYZPCRLYGLF-UHFFFAOYSA-N 0.000 description 1
- 229910001563 bainite Inorganic materials 0.000 description 1
- 238000004166 bioassay Methods 0.000 description 1
- 201000009230 common cold Diseases 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 230000001186 cumulative Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- CWYNVVGOOAEACU-UHFFFAOYSA-N fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 230000004301 light adaptation Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 239000003607 modifier Substances 0.000 description 1
- 239000010813 municipal solid waste Substances 0.000 description 1
- 201000009240 nasopharyngitis Diseases 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
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- 238000000746 purification Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C1/00—Refining of pig-iron; Cast iron
- C21C1/02—Dephosphorising or desulfurising
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
- C21C5/30—Regulating or controlling the blowing
- C21C5/35—Blowing from above and through the bath
-
- 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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
-
- 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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
- C21D1/25—Hardening, combined with annealing between 300 degrees Celsius and 600 degrees Celsius, i.e. heat refining ("Vergüten")
-
- 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
- C21D8/0226—Hot rolling
-
- 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
- C22C38/08—Ferrous alloys, e.g. steel alloys containing nickel
-
- 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
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
-
- 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
- C22C38/14—Ferrous alloys, e.g. steel alloys containing 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
- C22C38/32—Ferrous alloys, e.g. steel alloys containing chromium with boron
Abstract
The invention provides an 800 MPa-level high-strength-tenacity steel plate used for an engineering machine in an extremely cold environment and a manufacturing method for the 800 MPa-level high-strength-tenacity steel plate. The steel plate and the manufacturing method are suitable for manufacturing of mechanical components with high requirements for the strength and low-temperature tenacity of the steel plate. The 800 MPa-level high-strength-tenacity steel plate comprises the chemical components including, by weight percentage, 0.12% to 0.17% of C, 0.15% to 0.40% of Si, 0.90% to 1.50% of Mn, smaller than or equal to 0.008% of P, smaller than or equal to 0.003% of S, 0.015% to 0.060% of Al, 0.010% to 0.030% of Ti, 0.030% to 0.070% of Nb, 0.12% to 0.60% of Ni, 0.10% to 0.50% of Cr, 0.20% to 0.50% of Mo, 0.0015% to 0.0030% of B and the balance Fe and inevitable impurities. The steel plate is a high-strength steel plate with the tensile strength at an 800 MPa level, the relatively low alloy adding amount is adopted, the carbon equivalent is low, the welding performance is good, the grain of the steel plate is fine and small, the structure is dense, the inner quality is good, the performance is stable and even, the steel plate especially has the particularly excellent low-temperature tenacity, the Charpy impact absorbing energy at the test temperature of -60 DEG C is kept at a high level, and the steel plate can be used for manufacturing of the engineering machine in the extremely cold environment and is safe and reliable.
Description
Technical field
The invention belongs to metal material and manufacture field, relate to a kind of tensile strength 800MPa grade high-strength steel plate and manufacture method thereof, this high-strength steel sheet excellent in low temperature toughness, under-60 DEG C of test temperatures, Charpy impact energy keeps higher level, can be used for the manufacture of extremely cold area engineering machinery.
Background technology
Worldwide, the demand growing to the energy for meeting economic development, area resource of extremely trembling with fear, the paces of energy development are the most constantly expanded.Owing to new construction is in high latitude area, taking place frequently of extreme climate, winter temperature can reach-40 DEG C even lower, engineering machinery is had higher requirement in extremely cold area construction reliability.Early stage, mainly for-30 DEG C of environment above during domestic project Machine Design, consideration is there is no for-40 DEG C and environment above, it is little that polar climate adaptability research is carried out, under extremely the tremble with fear market demand and enterprise development double drive, sight has been placed on and has been applied under extreme environment in the exploitation of product by domestic key project machinery enterprise, the construction machinery product under the conditions of progressively exploitation is applicable to " the coldest ".The engineering machinery being applied to extremely tremble with fear under environment high latitude area proposes new challenge to ferrous materials, not only high to requirement of strength, it is the highest that tensile strength reaches 800MPa, requirement to low-temperature impact toughness is the harshest, even if also require that the low temperature impact properties of examination-40 DEG C (E levels) in common cold condition condition, cold or extremely cold under the conditions of examine the low temperature impact properties of-60 DEG C (F levels).The area engineering machinery high strength steel plate domestic-developed research of extremely trembling with fear with-60 DEG C of low-temperature flexibilities is less, domestic not yet forms complete, the production technology of mature system, and the problem that presently, there are mainly has:
(1) using common constituent and conventionally produced high-strength steel, steel plate ductile-brittle transition temperature limitation is big, and-60 DEG C of impact absorbing energy mean value surplus capacities are low, easily occur that monodrome is discrete, and the stability of steel plate is poor；
(2) product specification bad adaptability, after product thickness is more than 60mm, heart portion performance especially low temperature is rushed in row and is difficult to reach requirement, and through-thickness performance uniformity is bad；
(3) cost of alloy height, welding performance are deteriorated, and in order to reach intensity and the toughness of requirement, certainly will add a large amount of alloying element, cause cost to increase, and welding performance is deteriorated, the bad guarantee of joint low-temperature flexibility, reliability decrease.
Summary of the invention
The engineering machinery 800MPa level high toughness steel plate that present invention aims to the problem of above-mentioned existence and provide a kind of adaptation extremely to tremble with fear area and manufacture method thereof, solving that traditional quenched high-tensile structural steel specification is limited, weldability is poor, low-temperature flexibility can not adapt to extremely to tremble with fear the problem of environment.
Technical scheme is as follows:
One is extremely trembled with fear engineering machinery 800MPa level high strength steel plate under environment, it is characterized in that, this steel plate main chemical compositions percentage by weight is: C:0.12～0.17%, Si:0.15～0.40%, Mn:0.90～1.50%, P≤0.008%, S≤0.003%, Al:0.015～0.060%, Ti:0.010～0.030%, Nb:0.030～0.070%, Ni:0.12～0.60%, Cr:0.10～0.50%, Mo:0.20～0.50%, B:0.0015～0.0030%, remaining is Fe and inevitable impurity；Meanwhile, the chemical composition of steel plate also meet carbon equivalent require:
Carbon equivalent: Ceq=C+Mn/6+ (Cr+Mo+V)/5+ (Cu/+Ni)/15≤0.60%.
The thickness range of this kind of engineering machinery high strength steel plate is 6～80mm；Its main Mechanical index is yield strength (Rp0.2) >=690MPa, tensile strength (Rm) 770-930MPa, elongation after fracture (A) >=14% ,-60 DEG C of Charpy impact energy (KV2)≥34J。
The manufacture method of engineering machinery 800MPa level high strength steel plate under a kind of environment of extremely trembling with fear, concretely comprises the following steps: KR molten iron pretreatment → top and bottom combined blown converter smelting → LF+RH refining → slab casting → heating of plate blank → high-pressure water descaling → recrystallization zone rolling → intermediate blank spray accelerates cooling → Unhydrated cement rolling → acceleration cooling → aligning → stacking slow cooling → shot-peening → Quenching Treatment → temper → aligning → finishing → spray mark → inspection by sampling.
The manufacture method of engineering machinery 800MPa level high strength steel plate under described environment of extremely trembling with fear, it specifically comprises the following steps that
KR molten iron pre-processes: sulfur content is down to not higher than 0.005%, phosphorus content is down to not higher than 0.08%；
Top and bottom combined blown converter smelting: subsequently by being combined less-slag melting at the bottom of converter top, with Si-Fe, Mn-Fe, Ca-Si order of addition adjusting component and final deoxidation, smelting endpoint carbon content controls to smelt by making a gesture of measuring desired value low 0.02%, low temperature basicity dephosphorization, it is ensured that phosphorus content is not higher than 0.006%；
LF external refining: carry out trimming in the LF stage, it is ensured that carbon equivalent (%) meets requirement, implements inclusion modification Ca process, more than soft blow 8min, it is ensured that Ca/Al S >=0.1；
RH external refining: carry out microalloy treatment, deep desulfuration in the RH stage, it is ensured that the time of vacuum≤2.0mba is not less than 15min, the content reducing O, H, N pernicious gas and S is not higher than 0.002%, purifies steel further；
Slab is cast: the continuous casting stage passes through electromagnetic agitation and the weak cold control of bending section, and in the range of controlling degree of supercooling 15-25 DEG C, plate blank coarse micro-grain center segregation 1.0 grades, flawless is with loose, and slab carries out surface inspection and process；
Heating of plate blank: rolling advances into walking beam furnace and is heated to 1200～1250 DEG C, before heating, standing time was more than 72 hours, and slab thickness is 250mm, heats 4.5 hours；
High-pressure water descaling: first carry out the high-pressure water descaling no less than 3 times after coming out of the stove, water under high pressure hydraulic pressure is not less than 15MPa；
Recrystallization zone rolls: can occur recrystallization zone that billet rolling is become intermediate blank at γ, it is ensured that this stage, at least 2 percentage pass reductions were more than 22%, start rolling temperature 1120 DEG C-1140 DEG C, finish to gauge 1080 DEG C-1100 DEG C；
Intermediate blank spray accelerates cooling: frame water under high pressure spraying cooling fully refines austenite；
Unhydrated cement rolls: start finish rolling at γ Unhydrated cement, before α changes, the steel plate meeting dimensional requirement it is rolled at γ, rolling temperature controls at 890 DEG C～(Ar3+40 DEG C), cumulative deformation >=65%, it is ensured that the previous pass deformation rate more than 20% of extreme trace time；
Accelerating cooling: rolling rear laminar cooling process, open cold temperature and be not less than 750 DEG C, final cooling temperature is 450～550 DEG C, cooling velocity is more than 15 DEG C/s, obtains organizing the bainite structure of fully refinement；Stacking slow cooling is quickly collected after the steel plates straightening being disposed；
Bead before Quenching Treatment；
Quenching Treatment: holding temperature Ac3+40～60 DEG C, temperature retention time adjusts 1.8min/mm+0～15min according to thickness specification；
Temper: the steel plate after quenching is carried out 580 DEG C～650 DEG C of high temperings, temperature retention time adjusts 1.5～2.5min/mm+0～15min according to thickness specification；
To steel plates straightening, finishing, spray number mark, and inspection by sampling performance after tempering.
The manufacture method of the present invention applies following technology: KR molten iron pre-processes；BOF takes off P technology；Low field trash LF+RH refining techniques；Sheet slab continuous casting technology；Heating of plate blank；Controlled rolling technology, in austenite recrystallization district, big pressure realizes abundant recrystallization, at non-recrystallization zone rolling temperature control and accumulative drafts；Press quenching technology；Non-oxidation roller hearth furnace modifier treatment.
In order to ensure the purpose of the present invention, while the engineering machinery high strength steel plate making the present invention has high intensity, there is good plasticity and toughness and welding performance, product composition of the present invention design adds the microalloy alloying elements such as Nb, Ti on the basis of the C-Mn-Cr-Mo-B alloy system that cost is saved relatively, and is properly added Ni element.Ni is uniquely not only to improve the intensity of steel plate but also improve the alloying element of impact flexibility, the lattice paprmeter of Ni is close with γ-iron, so continuous solid solution can be become, this hardenability being advantageous for improving steel, Ni can reduce critical point and increase the stability of austenite, so its hardening heat can reduce, quenching degree is good.When Ni same Cr, Mo combine when, quenching degree can increase especially.Therefore, quenched and tempered steel adds the Ni effect that had intensity and toughness, effectively reduces ductile-brittle transition temperature, but Ni's is expensive, need from metallurgical, roll, be heat-treated angle and give full play to its effect, reduction addition.Nb element refined crystalline strengthening effect is big, adds to and can play obvious action in high strength steel, improves impact flexibility and the intensity of steel further.Mn upper limit content is set to 1.50%, determines that the maximum level of this Mn is to prevent continuous casting billet center segregation, it is to avoid cause low-temperature flexibility to decline and flaw detection discord.From improving steel plate toughness angle, S, P content are the lowest, and toughness of products is the best, but de-S, P cost is the highest, it is considered to product economy, control within 0.005% by S content, P controls within 0.008%.Limit C content be limited in 0.12～0.17%, Si content between 0.15～0.40%, meet welding performance requirement.Al is also deoxidant element, the AlN simultaneously formed in steel can effective crystal grain thinning, content 0.015%～0.060% is the most suitable.
The present invention is pre-processed by KR molten iron and converter top and bottom complex blowing less-slag melting, effectively reduces the P element content having high risks to plasticity and toughness；Reduced pernicious gas and the impurity contents such as O, H, N, S by LF+RH, make steel purification degree reach high level, and improve inclusion morphology；Sheet slab continuous casting working procedure uses bending section weak cold and electromagnetic agitation, promotes inclusion floating, it is ensured that slab quality, improves the basic guarantee of obdurability from slab raw material.At rolling and heat treatment stages, the technology such as add austenite recrystallization district heavy reduction rolling control technology, intermediate blank spray accelerates cooling, austenite non-recrystallization low temp area big pressure rolling technique and press quenching+off-line is quenched, effectively refine the original austenite grains of steel plate especially mid-depth, lay organization foundation for obtaining high-strength tenacity steel plate.
The invention has the beneficial effects as follows:
Advantages of the present invention highlights, and the little cost advantage of steel plate alloy addition level is obvious.Internal quality of steel plate is good, and steel plate crystal grain is tiny, dense structure, and the stable performance of steel plate is uniform, superior in quality, especially has good low-temperature impact toughness, can be used for low-temperature flexibility is required higher high-strength steel application.Its main Mechanical index is yield strength (Rp0.2) >=690MPa, tensile strength (Rm) 770-930MPa, elongation after fracture (A) >=14% ,-60 DEG C of Charpy impact energy (KV2)≥34J。
In a word, the steel plate of the present invention belongs to tensile strength 800MPa grade high-strength steel plate, have employed relatively low alloy addition level, carbon equivalent is low, weldability good, and steel plate crystal grain is tiny, dense structure, internal soundness are good, and stable performance is uniform, especially there is particularly excellent low-temperature flexibility, under-60 DEG C of test temperatures, Charpy impact energy keeps higher level, can be used for the manufacture of extremely cold area engineering machinery, safe and reliable.
Accompanying drawing explanation
Fig. 1 is embodiment 1 light plate metallographic structure；
Fig. 2 is embodiment 2 light plate metallographic structure；
Fig. 3 is the impact fracture pattern (SEM) of embodiment 2.
Detailed description of the invention
Below by specific embodiment, technical scheme is described in detail.
Combine accompanying drawing by embodiment below the present invention is described in more detail.In embodiment, all steel plates all produce according to following technological process:
KR molten iron pretreatment → top and bottom combined blown converter smelting → LF+RH refining → slab casting → heating → high-pressure water descaling → recrystallization zone rolling → intermediate blank spray accelerates cooling → Unhydrated cement rolling → acceleration cooling → aligning → stacking slow cooling → shot-peening → Quenching Treatment → temper → aligning → finishing → spray mark → inspection by sampling.
Embodiment 1: produce in strict accordance with the technological process of production, main technique link key parameter controls as follows:
KR pre-processes: phosphorus content is 0.05%, and sulfur content is 0.004%；
Converter top and bottom complex blowing: smelting endpoint carbon content controls to smelt by making a gesture of measuring desired value low 0.02%, and phosphorus content is 0.005%；
LF external refining: make white slag desulfurization, the soft blow time be 9min, Ca/AlS be 0.15, carry out trimming；
RH external refining: the time of vacuum≤2.0mba is 18min, actual measurement sulfur content is 0.002%, carries out trimming；
Slab is cast: fluctuate in the range of controlling degree of supercooling 15-25 DEG C, plate blank coarse micro-grain center segregation 1.0 grades, and flawless is with loose, and slab carries out surface inspection and process；The smelting component that the present embodiment finally obtains is shown in Table 1.
Heating of plate blank: before heating, standing time was more than 72 hours, and slab thickness is 250mm, heats 4.5 hours, and soaking temperature is 1215 DEG C；
High-pressure water descaling: water under high pressure hydraulic pressure is not less than 15MPa, de-scaling 3 times；
Recrystallization zone roll: start rolling temperature 1120 DEG C, finish to gauge 1080 DEG C, the 2nd, 3 percentage pass reductions be respectively 28%, 26.8%, utilize rapidly roughing mill frame spraying cooling after rolling；
Unhydrated cement rolls: open rolling 880 DEG C, finish to gauge 823 DEG C, the previous pass deformation rate 23% of extreme trace time；
Accelerate cooling: open cold 795 DEG C, cold 530 DEG C eventually, 20 DEG C/s of cooling rate；Stacking slow cooling is quickly collected after the steel plates straightening being disposed；
Off-line is heat-treated: bead before quenching, and quenching soaking temperature is 915 DEG C, and at stove 40min, temper temperature is 630 DEG C, at stove 40min, steel plate slow cooling of coming out of the stove after aligning to normal temperature, finishing process after spray number inspection by sampling performance.
It is 20mm that this example finally obtains the thickness of steel plate, and its mechanical performance testing result is shown in Table 2, and steel plate has good performance.Fig. 1 is this embodiment steel plate metallographic structure photo, it can be seen that steel plate is organized as typical tempered structure, and fine microstructures is uniform.
Embodiment 2: produce in strict accordance with the technological process of production, main technique link key parameter controls as follows:
KR pre-processes: phosphorus content is 0.05%, and sulfur content is 0.003%；
Converter top and bottom complex blowing: smelting endpoint carbon content controls to smelt by making a gesture of measuring desired value low 0.02%, and phosphorus content is 0.0055%；
LF external refining: make white slag desulfurization, the soft blow time be 10min, Ca/AlS be 0.18, carry out trimming；
RH external refining: the time of vacuum≤2.0mba is 21min, actual measurement sulfur content is 0.001%, carries out trimming；
Slab is cast: fluctuate in the range of controlling degree of supercooling 18-25 DEG C, plate blank coarse micro-grain center segregation 0.5 grade, and flawless is with loose, and slab carries out surface inspection and process；The smelting component that the present embodiment finally obtains is shown in Table 1.
Heating of plate blank: before heating, standing time was more than 72 hours, and slab thickness is 250mm, heats 4.5 hours, and soaking temperature is 1240 DEG C；
High-pressure water descaling: water under high pressure hydraulic pressure is not less than 15MPa, de-scaling 3 times；
Recrystallization zone roll: start rolling temperature 1135 DEG C, finish to gauge 1090 DEG C, the 2nd, 3 percentage pass reductions be respectively 31%, 27%, utilize rapidly after rolling roughing mill frame spray accelerate cooling；
Unhydrated cement rolls: open rolling 820 DEG C, finish to gauge 812 DEG C, the previous pass deformation rate 21% of extreme trace time；
Accelerate cooling: open cold 778 DEG C, cold 460 DEG C eventually, 18 DEG C/s of cooling rate；Stacking slow cooling is quickly collected after the steel plates straightening being disposed；
Off-line is heat-treated: bead before quenching, and quenching soaking temperature is 910 DEG C, and at stove 108min, temper temperature is 585 DEG C, at stove 120min, steel plate slow cooling of coming out of the stove after aligning to normal temperature, finishing process after spray number inspection by sampling performance.
It is 60mm that this example finally obtains the thickness of steel plate, and its mechanical performance is shown in Table 2, steel plate center and the similar nature of 1/4 position.Fig. 2 is this embodiment steel plate metallographic structure photo, and Fig. 3 is that this example steel plate impact fracture scans pattern.Observing from SEM fracture, impact specimen fracture is tough break, and the low-temperature good toughness of steel plate is described.
Owing to embodiment 2 steel plate thickness is big, the steel plate producing this embodiment 2 has carried out mechanical performance uniformity test, at steel plate head, middle part, afterbody, the wide edge of plate, at 1/4 and at 1/2 sampling carry out intensity and low-temperature flexibility inspection.Assay is shown in Table 4.Result of the test shows that invention steel plate each position performance is uniform.
Table 1 embodiment 1,2 melting chemical composition (wt, %)
Table 2 embodiment 1,2 steel plate machinery performance test results
Table 3 embodiment 2 steel plate uniformity test
Note: ballistic work is mean value.
Claims (5)
1. extremely trembling with fear an engineering machinery 800MPa level high strength steel plate under environment, its feature exists
In, this steel plate main chemical compositions percentage by weight is: C:0.12～0.17%, Si:0.15～
0.40%, Mn:0.90～1.50%, P≤0.008%, S≤0.003%, Al:0.015～
0.060%, Ti:0.010～0.030%, Nb:0.030～0.070, Ni:0.12～0.60%,
Cr:0.10～0.50%, Mo:0.20～0.50, B:0.0015～0.0030, remaining is
Fe and inevitably impurity；Meanwhile, the chemical composition of steel plate also meet carbon equivalent require:
Carbon equivalent: Ceq=C+Mn/6+ (Cr+Mo+V)/5+ (Cu/+Ni)/15≤0.60%.
Under environment of extremely trembling with fear the most according to claim 1, engineering machinery 800MPa level is high-strength
Steel plate, it is characterised in that the thickness range of steel plate is 6～80mm.
Under environment of extremely trembling with fear the most according to claim 1, engineering machinery 800MPa level is high-strength
Steel plate, it is characterised in that the mechanical performance index of this steel plate is yield strength (Rp0.2)
>=690MPa, tensile strength (Rm) 770-930MPa, elongation after fracture (A) >=14% ,-60 DEG C
Charpy impact energy (KV2)≥34J。
4. under the environment of extremely trembling with fear as described in claim 1-3, engineering machinery 800MPa level is high-strength
The manufacture method of steel plate, it is characterised in that concretely comprise the following steps: KR molten iron pre-processes → push up the end
Combined blown converter smelting → LF+RH refining → slab casting → heating of plate blank → high-pressure water descaling → again
Crystal region rolling → intermediate blank spray acceleration cooling → Unhydrated cement rolling → acceleration cooling →
Aligning → stacking slow cooling → shot-peening → Quenching Treatment → temper → aligning → finishing → spray number
Mark → inspection by sampling.
Under environment of extremely trembling with fear the most according to claim 4, engineering machinery 800MPa level is high-strength
The manufacture method of steel plate, it is characterised in that it specifically comprises the following steps that
KR molten iron pre-processes: sulfur content is down to not higher than 0.005%, is down to not by phosphorus content
Higher than 0.08%；
Top and bottom combined blown converter smelting: subsequently by being combined less-slag melting at the bottom of converter top, with Si-Fe,
Mn-Fe, Ca-Si order of addition adjusting component and final deoxidation, smelting endpoint carbon content is by making a gesture of measuring
Desired value low 0.02% controls to smelt, low temperature basicity dephosphorization, it is ensured that phosphorus content is not higher than
0.006%；
LF external refining: carry out trimming in the LF stage, it is ensured that carbon equivalent (%) meets to be wanted
Ask, implement inclusion modification Ca process, more than soft blow 8min, it is ensured that Ca/AlS >=0.1；
RH external refining: carry out microalloy treatment, deep desulfuration in the RH stage, it is ensured that true
The time of reciprocal of duty cycle≤2.0mba is not less than 15min, reduction O, H, N pernicious gas and S's
Content is not higher than 0.002%, purifies steel further；
Slab is cast: the continuous casting stage passes through electromagnetic agitation and the weak cold control of bending section, controls
In the range of cold degree 15-25 DEG C, plate blank coarse micro-grain center segregation 1.0 grades, flawless and loose, plate
Base carries out surface inspection and process；
Heating of plate blank: rolling advances into walking beam furnace and is heated to 1200～1250 DEG C, heating
Front standing time is more than 72 hours, and slab thickness is 250mm, heats 4.5 hours；
High-pressure water descaling: first carry out the high-pressure water descaling no less than 3 times, water under high pressure after coming out of the stove
Hydraulic pressure is not less than 15MPa；
Recrystallization zone rolls: can occur recrystallization zone that billet rolling is become intermediate blank at γ, it is ensured that
This stage, at least 2 percentage pass reductions were more than 22%, start rolling temperature 1120 DEG C-1140 DEG C, eventually
Roll 1080 DEG C-1100 DEG C；
Intermediate blank spray accelerates cooling: frame water under high pressure spraying cooling fully refines austenite；
Unhydrated cement rolls: start finish rolling at γ Unhydrated cement, rolls before α changes at γ
Making the steel plate meeting dimensional requirement, rolling temperature controls at 890 DEG C～(Ar3+40 DEG C), tired
Long-pending deflection >=65%, it is ensured that the previous pass deformation rate more than 20% of extreme trace time；
Accelerate cooling: roll rear laminar cooling process, open cold temperature and be not less than 750 DEG C, eventually cold temperature
Degree is 450～550 DEG C, and cooling velocity is more than 15 DEG C/s, obtains organizing the bayesian of fully refinement
Soma；Stacking slow cooling is quickly collected after the steel plates straightening being disposed；
Bead before Quenching Treatment；
Quenching Treatment: holding temperature Ac3+40～60 DEG C, temperature retention time adjusts according to thickness specification
1.8min/mm+0～15min；
Temper: the steel plate after quenching is carried out 580 DEG C～650 DEG C of high temperings, during insulation
Between according to thickness specification adjust 1.5～2.5min/mm+0～15min；
To steel plates straightening, finishing, spray number mark, and inspection by sampling performance after tempering.
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