CN110195193A - Low cost, 800MPa grades of hardened and tempered steel plates of high tenacity and superior weldability and its manufacturing method - Google Patents
Low cost, 800MPa grades of hardened and tempered steel plates of high tenacity and superior weldability and its manufacturing method Download PDFInfo
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- CN110195193A CN110195193A CN201810163615.4A CN201810163615A CN110195193A CN 110195193 A CN110195193 A CN 110195193A CN 201810163615 A CN201810163615 A CN 201810163615A CN 110195193 A CN110195193 A CN 110195193A
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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
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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
- C21D8/0221—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
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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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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
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- C22C33/04—Making ferrous alloys by melting
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- 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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- 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
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- 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
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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
- C22C38/54—Ferrous alloys, e.g. steel alloys containing chromium with nickel with boron
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Abstract
Low cost, 800MPa grades of hardened and tempered steel plates of high tenacity and superior weldability and its manufacturing method, based on component system using ultralow C- ultralow Si- high Mn- (Cu+Ni+Mo+ high Cr) alloying-(Ti+V+B) microalloying, the molten Als content of acid and (%Als) >=10 × [(%N in steel are properly increasedt) -0.292 (%Ti)], control wide-angle lath of bainite/martensite lath crystal boundary forms index χ >=2.1, (%C) × [(%Si)+0.83 (%Mo)+1.12 (%Nb)+0.89 (%Als)+0.45 (%V)]≤0.031, DI index × ζ × TIt opens cold×[(TIt opens cold‑TStop cold)/(TIt opens cold+TStop cold)]/t >=1535, Ca is handled and Ca/S ratio equal metallurgical technologies control means between 1.00~3.00, optimize the offline tempering process T of CR+DQ+, make the uniform tiny lower bainite+lath martensite of the microscopic structure of finished steel plate, average colony size is at 20 μm hereinafter, obtaining excellent strong plasticity, obdurability.
Description
Technical field
The present invention relates to high strength steel plate, in particular to a kind of low cost, high tenacity and 800MPa grades of superior weldability are quenched
Steel plate and its manufacturing method, tensile strength >=780MPa, yield strength >=690MPa, -50 DEG C of Charpy side knock function are (single
Value) >=47J, fracture elongation δ5>=15%, there is superior weldability.
Background technique
It is well known that low-carbon (high intensity) low-alloy steel is one of most important structural timber, it is widely used in petroleum
Natural gas line, ocean platform, shipbuilding, bridge structure, boiler vessel, building structure, auto industry, railway transportation and mechanical system
Among making；Low-carbon (high intensity) low-alloy steel performance depends on its chemical component and manufacturing process, wherein intensity, toughness, plasticity
And weldability is the most important performance of low-carbon (high intensity) low-alloy steel, it is finally decided by the microscopic structure shape of finished steel
State；As metallurgical science and technology constantly advances, people put forward higher requirements the toughness, plasticity, weldability of high-strength steel, i.e.,
Steel plate is under low-temperature condition, while there is high intensity, high-elongation, anti-brittle fracture and plastic instability fracture energy, steel plate
Welding performance is excellent；And under the conditions of lower manufacturing cost, comprehensive mechanical performance and the use of steel plate is significantly increased
Performance mitigates own wt, stability and the safety of steel member to reduce the dosage save the cost of steel, even more important
It is to further increase the security reliability during strong quenched and tempered steel cold and hot working and military service；It is lifted within the scope of European Union, Japan and Korea S at present
The research climax for developing high-performance steel iron material of new generation has been acted, has tried hard to set optimization meter and innovation manufacturing process by alloy combination
Technology obtains better microscopic structure matching, ultra fine nlicrostructures and structure, and high-strength steel is made to obtain more excellent strong plasticity, obdurability
Matching.
Traditional tensile strength >=780MPa high strength steel plate mainly passes through offline hardening and tempering process (RQ+T) production；This will
Ask steel plate necessity that there is sufficiently high harden ability and hardenability, i.e. hardenability index DI >=2 × finished steel plate thickness [DI=
0.311C1/2(1+0.64Si)×(1+4.10Mn)×(1+0.27Cu)×(1+0.52Ni)×(1+2.33Cr)×(1+
3.14Mo) × 25.4 (mm)], to ensure that steel plate is micro- with sufficiently high intensity, excellent low-temperature flexibility and along plate thickness direction
The uniformity of microstructure and property, thus the alloying elements such as a large amount of Cr, Mo, Ni, Cu are inevitably added into steel, especially it is added
A large amount of Ni element it is inevitable (referring to " CAMP-ISIJ ", Vol.4,1991,1949；" CAMP-ISIJ ", Vol.4,1991,
1950；" CAMP-ISIJ ", Vol.7,1994,836；" CAMP-ISIJ ", Vol.7,1994,837；The clear 59- of Japan Patent
129724；Flat 1-219121；" research of Nippon Steel's steel " No. 314-1984；" japanese steel pipe skill report " No.107-1985；It is " new
Day iron skill report " No. 348-1993；" Kawasaki Steel skill report " Vol.4 (No.3) -1972；" Kawasaki Steel skill report " Vol.7
(No.2)-1975)。
More importantly using traditional quenched and tempered steel component system and manufacturing process, not only the steel plate manufacturing cycle is long, manufacture at
This height, the steel scrap processing containing Cu, Ni high is difficult, limits the efficiency of waste steel recycling recycling；And for traditional hardening and tempering process
Production 80 feather weight quenched and tempered steel, since steel plate alloy content is higher, cause steel plate elongation percentage is lower, yield tensile ratio is higher, welding
Property poor (welding cold crack sensitivity height, welding heat affected zone embrittlement degree height, reheat crack(ing) sensitivity etc.), plate thickness directional performance are equal
Even property controls the features such as difficulty is larger；And lower elongation percentage is not only bad for steel plate cold and hot working performance, and to steel plate
Anti-fatigue performance, resistance to stress concentrate sensibility and structural stability to be affected, and the penstocks in hydroelectric project and steel branch off
Large-scale construction projects and the Large-Scale Equipment such as pipe, thermoelectricity steam turbine generator and offshore platform structure, crane barge peculiar to vessel and giant excavator
Above in use, there is the biggish hidden danger of safety；Therefore when the heavily loaded steel construction of large-scale fatigue uses high-strength steel, it is generally desirable to 80 kilograms
There is grade high-strength steel excellent obdurability, strong plasticity to match, especially tension elongation percentage δ518% or more.
Existing a large amount of patent documents only illustrate how to realize the intensity and low-temperature flexibility of base material steel plate, just improve steel plate and weld
Connect can property, obtain excellent welding heat affected zone HAZ low-temperature flexibility illustrate it is less, more without reference to how improve steel plate tension it is strong
While spending, tension elongation percentage and the thickness direction mechanical property uniformity for improving steel plate are (the clear 63-93845 of Japan Patent, clear
63-79921, clear 60-258410, spy is opened flat 4-285119, spy is opened flat 4-308035, flat 3-264614, flat 2-
250917, flat 4-143246, United States Patent (USP) US Patent5798004, European patent EP 0288054A2, " Western Hills souvenir technology
Lecture " 159-160, P79~P80).
Disclosed in China Patent No. CN200710042357.6 " have superior weldability low yield ratio HT 780 steel plate and its
Manufacturing method；" obdurability, the steel plate of strong plasticity and its manufacturing method " disclosed in China Patent No. CN200810036416.3；In
" inexpensive 80 feather weight extra-thick quenched and tempered steel plates and its manufacturing method " disclosed in state patent No. CN200910048287, although these
The steel plate comprehensive mechanical property of patented technology production also reaches high level: tensile strength >=780MPa, yield strength >=
690MPa, -40 DEG C and its following temperature Charpy side knock function (single value) >=47J, steel plate excellent weldability；But in steel plate
A certain amount of Cu, Ni alloying element is inevitably added, a fairly large number of Ni element is especially added.
There are also its steel plate chemical components to be free of Cu, Ni element, but impact flexibility can only meet -20 DEG C and its temperatures above
It is required that (such as China Patent No. CN200910048287 80 feather weight extra-thick quenched and tempered steel plates of low cost and its manufacturing method).In addition,
Using controlled rolling+out-line quenching+tempering process；Not only manufacturing process is more for this, the manufacturing cycle is long, manufacturing cost is high, but also makes
Making process energy consumption, also relatively high (steel plate rolling terminates and natural air cooling is to room temperature, after then carrying out Shot Blasting, heats again
To hardening heat), it is unfavorable for energy conservation and environmental protection；And alloying element cannot be given full play to using out-line quenching+tempering process and quenched
Thoroughly, hardenability potential, the through hardening of element, hardenability cannot be played farthest；It therefore is acquisition same intensity, toughness
It is horizontal, it is necessary to add more alloying elements (especially Ni, Mo, Cr etc.), this not only further increases manufacturing cost, but also damages
The weldability of evil steel plate, particularly with ultrahigh-strength steel plates, Cold Cracking Susceptibility is increased substantially, and is needed at a higher temperature
Welding preheating and rear heat (i.e. PWHT), suitable thermal weld stress amount range are narrower, and correspondingly processing and fabricating cost is also just substantially
Degree improves." no 80 feather weight high-strength steel of nickel high tenacity and its manufacturer disclosed in China Patent No. CN201210209649.5
Method " uses the expensive alloying elements such as no added Cu, Ni, is successfully developed using DQ technique, and the 800MPa grade haveing excellent performance is adjusted
Matter steel plate, but low-temperature flexibility be not able to satisfy -50 DEG C of low temperature requirements and steel plate cannot be using without preheating welding, thermal weld stress also not
50kJ/cm can be higher than.
Summary of the invention
The purpose of the present invention is to provide it is a kind of low cost, 800MPa grades of hardened and tempered steel plates of high tenacity and superior weldability and its
Manufacturing method, on the basis of addition Cu, Ni alloying element on a small quantity, while obtaining high-intensitive at low cost, steel plate ultralow temperature
Toughness, weldability are similarly excellent, and steel plate can bear high heat-input welding, and successfully solve 800MPa grades of quenched and tempered steel
Conflicting problem between the intensity of plate, ultralow-temperature flexibility and weldability；Branch off especially suitable for hydraulic power pressure water pipe, steel
The large-scale steel structures such as pipe, volute, ocean platform, large-scale engineering machinery, coal mine machinery and equipment.
In order to achieve the above objectives, the technical scheme is that
The present invention is using the ultralow Si- high Mn- of ultralow C- (Cu+Ni+Mo+ high Cr) alloying-(Ti+V+B) microalloying
Based on component system, the molten Als content of acid and (%Als) >=10 × [(%N in steel are properly increasedt) -0.292 (%Ti)],
Control wide-angle lath of bainite/martensite lath crystal boundary formed index χ >=2.1, (%C) × [(%Si)+0.83 (%Mo)+
1.12 (%Nb)+0.89 (%Als)+0.45 (%V)]≤0.031, DI index × ζ × TIt opens cold×[(TIt opens cold-TStop cold)/(TIt opens cold+
TStop cold)]/t >=1535, Ca is handled and Ca/S ratio equal metallurgical technologies control means between 1.00~3.00, optimizes non-recrystallization control
The offline tempering process T-phase of CR+ press quenching DQ+ is rolled to combine, make the tiny low-carbon tempered martensite of the microscopic structure of finished steel plate+
It is tempered lower bainite, average colony size is at 20 μm hereinafter, obtaining the 800MPa grade high-strength steel of excellent strong plasticity, obdurability
Plate.
Specifically, 800MPa grades of low costs of the invention, high tenacity and superior weldability hardened and tempered steel plates, Ingredients Weight hundred
Divide ratio are as follows:
C:0.05%~0.08%
Si :≤0.10%
Mn:1.55%~1.85%
P :≤0.013%
S :≤0.0030%
Cu:0.10%~0.40%
Ni:0.10%~0.40%
Cr:0.50%~0.90%
Mo:0.10%~0.30%
Nb:0.010%~0.035%
V:0.025%~0.055%
Ti:0.007%~0.014%
B:0.0010%~0.0018%
Als:0.025%~0.060%
N :≤0.0055%
Ca:0.001%~0.0035%
Remaining is Fe and inevitable impurity；And above-mentioned constituent content must simultaneously meet following relationship:
Control wide-angle lath of bainite/martensite lath crystal boundary and form index χ >=2.1, it is ensured that steel plate quenching and after
During continuous steel plate Thermal Cycle, bainite/martensite lath crystal boundary is high-angle boundary, increases crackle and passes through bainite plate
Item/martensite lath crystal boundary resistance improves the low-temperature flexibility of high-strength hardened and tempered steel plate and welded thin-wall box component；Wherein, χ=1.33 (%
Mn)+(%Ni)+0.55 (%Cu)+0.21 (%Cr) -0.93 (%Mo) -2.55 (%Nb) -1.91 (%Ti) -1.42 (%V)；
This is one of key core technologies of the present invention.
(%C) × [(%Si)+0.83 (%Mo)+1.12 (%Nb)+0.89 (%Als)+0.45 (%V)]≤0.031, mentions
The critical cooling rate of high martensitic traoformation promotes lower bainite BLIt is formed, effectively segmentation original austenite grain, refines 800MPa
The colony size of grade hardened and tempered steel plate steel plate, it is tough to improve base material steel plate low temperature；Promote Carbide Precipitation, inhibit the island M/A analysis in HAZ
Out, the island M/A quantity and size are reduced, improves the island M/A form, improves the low-temperature flexibility of steel plate high heat-input welded thin-wall box component；This is this
One of invention key core technologies.
DI index × ζ × TIt opens cold×[(TIt opens cold-TStop cold)/(TIt opens cold+TStop cold)]/t >=1535, guarantee after press quenching (i.e. DQ), steel
The microscopic structure of plate is uniformly tiny lower bainite+lath martensite, it is ensured that steel plate has excellent obdurability, strong plasticity
Match, excellent low-temperature flexibility and uniform along plate thickness direction mechanical property；Wherein,
ζ is press quenching DQ through hardening sex factor, ζ value 1.4；
T is finished steel plate thickness (mm)；
DI=0.367 (%C)0.5[1+0.7 (%Si)] [(1+3.33 (%Mn)] [(1+0.35 (%Cu)] [(1+0.36
(%Ni)] [(1+2.16 (%Cr)] [(1+3 (%Mo)] [(1+1.75 (%V)] [(1+1.77 (%Al)] [(1+200 (%B)]
×25.4(mm)；
TIt opens coldFor the hardening heat (accelerating cooling start temperature) of press quenching DQ, TStop coldFor the quenching of press quenching DQ
Terminate temperature (accelerating cooling stopping temperature), temperature unit is DEG C；This is one of key core technologies of the present invention.
Als content and (%Als) >=10 × [(%Nt) -0.292 (%Ti)], to ensure to be dissolved B and AlN in steel with thin
Small disperse state is precipitated, and the crystal grain of the harden ability, refinement hardened and tempered steel plate that improve steel plate goes out, and improves the low-temperature flexibility of hardened and tempered steel plate.
Ca is handled and Ca/S ratio is between 1.00~3.00；To improve low-temperature flexibility, obdurability and the strong plasticity of steel plate
Match, weldability and anti-lamellar tearing performance.
Compositional data in relation above formula is calculated in terms of percentage, and if carbon content is 0.10%, when relational expression calculates, uses
0.10 brings calculating into.
In the ingredient design of steel of the present invention:
C is very big on the influence of the intensity of high-strength quenched and tempered steel, low-temperature flexibility, elongation percentage and weldability, from the high-strength quenched and tempered steel of improvement
Intrinsic plasticity and toughness and weldability angle, it is desirable to which C content controls lower in steel；But from the harden ability of high-strength quenched and tempered steel, strong modeling
Property matches with obdurability, microstructures Control and manufacturing cost angle during controlled rolling and DQ, and C content should not control too low,
Especially 800MPa grades of online hardened and tempered steel plate；Dimension C content zone of reasonableness is 0.05%~0.08%.
Mn as most important alloying element in steel except improve quenched and tempered steel intensity in addition to, also have expand austenite phase
Ar is greatly lowered in area3Point temperature, refinement bainite/martensite packet structure size, lath of bainite/martensite lath
Hardened and tempered steel plate and low-temperature flexibility are improved, promote low temperature phase change tissue bainite/martensite to be formed to difference and make to adjust in the position of crystal boundary
Matter steel plate has the strong plasticity matching of excellent obdurability；But Mn is easy to happen segregation during molten steel solidification, especially Mn contains
When measuring higher, pouring operation difficulty is not only resulted in, and is easy that conjugation segregation phenomena, especially steel occur with elements such as C, P, S
When middle C content is higher, aggravate the segregation in slab centre with it is loose, serious slab central area is segregated in subsequent control
It rolls, easily form abnormal structure in press quenching DQ and welding process, cause the ultralow-temperature flexibility of high-strength quenched and tempered steel low and welding
Connector is cracked；Therefore according to C content range in intensity rank and steel, select suitable Mn content range for 800MPa grades
Hardened and tempered steel plate is extremely necessary, and the suitable Mn content of hardened and tempered steel plate of the present invention is 1.55%~1.85%.
Si promotes deoxidation of molten steel and can be improved 800MPa hardened and tempered steel plate intensity, but uses the molten steel of Al deoxidation, Si's
Deoxidation is little, and although Si can be improved the intensity of hardened and tempered steel plate, but Si reduces the critical cooling rate that martensite is formed,
Inhibit lower bainite to be formed, low-temperature flexibility, elongation percentage and the weldability of high-strength hardened and tempered steel plate is seriously damaged, especially in larger line energy
It measures under welding condition, Si not only promotes the island M-A to be formed, but also the island the M-A size formed is more coarse, is unevenly distributed, seriously
Welding heat affected zone (HAZ) toughness and welding point SR performance are damaged, therefore the Si content in steel should control extremely low as far as possible,
Therefore, Si content controls below 0.10% in steel.
P is as the mechanical performance being mingled with to hardened and tempered steel plate harmful in steel, especially low-temperature impact toughness, elongation percentage, weldability
And welding point SR performance has huge detrimental effect, the lower theoretically require the better；But in view of steel-making operability and
Steel-making cost, for requiring superior weldability, -50 DEG C of toughness and the matched hardened and tempered steel plate of excellent strength-toughness, P content to need to control
≤ 0.013%.
S is mingled with to the low-temperature flexibility of hardened and tempered steel plate as harmful in steel with very big detrimental effect, it is often more important that S exists
In steel in conjunction with Mn, form MnS field trash, in the hot rolling, the plasticity of MnS makes MnS along rolling to extension, formed along roll to
MnS field trash band, serious low-temperature impact toughness, elongation percentage, Z-direction performance, weldability and the welding point SR performance for damaging steel plate,
Hot short essential element is generated in S or course of hot rolling simultaneously, the lower theoretically require the better；But in view of steel-making can operate
Property, steel-making cost and the smooth principle of logistics, for requiring superior weldability, -50 DEG C of toughness and excellent strength-toughness matched quenched
Steel plate, S content need to control≤0.0030%.
Cu austenite stabilizer element, addition Cu can also reduce Ar3Point temperature, improves the through hardening hardenability of hardened and tempered steel plate
With the atmospheric corrosion resistance of steel plate；But Cu additive amount is excessive, be higher than 0.40%, be easy to cause copper brittleness, casting billet surface cracking and
The problems such as implosion；For 800MPa grades of hardened and tempered steel plates, Cu additive amount is very few, is lower than 0.10%, cut any ice very little；
Therefore the control of Cu content is between 0.10%~0.40%.In addition, Cu, Ni it is compound addition except reduce copper bearing steel copper brittleness phenomenon,
The effect for mitigating the original austenite corrosion cracking of course of hot rolling is outer, it is often more important that and Cu, Ni are austenite stabilizer element,
Ar can be greatly lowered in the compound addition of Cu, Ni3, driving force of the austenite to ferrite transformation is improved, martensite/bayesian is caused
Body lath can cause martensite/lath of bainite crystal boundary position to become larger to difference to each Xiang Chang great, increase crackle and pass through horse
Family name's body/lath of bainite crystal boundary resistance, improves the low-temperature flexibility of hardened and tempered steel plate.
Ferritic phase Dislocations mobility not only can be improved in addition Ni, promotes the sliding and friendship of dislocation under cryogenic
Sliding improves bainite/martensite lath (being substantially BCC ferritic phase) intrinsic toughness；Ni is as stabilization of austenite member
Element reduces Ar3Point temperature, increases phase driving force, refines martensite/bainite colony size, increases martensite/bainite plate
The position of crystal boundary is to difference；Therefore Ni has the function of while improving hardened and tempered steel plate intensity, elongation percentage and low-temperature flexibility；Add Ni in steel
The copper brittleness phenomenon that copper bearing steel can also be reduced, mitigates the corrosion cracking of course of hot rolling, improves the atmospheric corrosion resistance of steel plate.Therefore
Theoretically, the higher the better in a certain range for Ni content in steel, but excessively high Ni content not only can the hot shadow of hardened weld
Area is rung, it is unfavorable to the weldability of steel plate, and cause steel plate manufacturing cost high, seriously affect the market competition of steel plate
Power；Therefore, suitable Ni content controls between 0.10%~0.30%, with ensure steel plate through hardening hardenability and steel plate it is strong
Toughness is matched with strong plasticity and manufacturing cost of the excellent low-temperature flexibility without increasing substantially steel plate.
Cr adds Cr and not only improves the harden ability of steel plate, promotes martensite/bayesian bodily form as weak carbide formation element
At, and martensite/lath of bainite crystal boundary position increases to difference, increases crackle and passes through martensite/bainite crystal boundary resistance,
While improving armor plate strength, has the effect for the steel plate toughness that has some improvement；But when Cr additive amount is excessive, tempering and
During Thermal Cycle, chromium containing carbide is precipitated agglomeration (being precipitated in item chain) in original austenite crystal prevention, serious to damage
The low-temperature flexibility and weldability of steel plate, but for 800MPa grades of DQ type hardened and tempered steel plates, it is necessary to there is certain Cr content, to guarantee
Steel plate has enough harden ability；Therefore suitable Cr content controls between 0.50%~0.90%.
The harden ability that Mo improves steel plate is added, promotes martensite/bainite to be formed, but Mo forms member as strong carbide
Element, while promoting the formation of martensite/bainite, the martensite that increases martensite/bainite packet size and formed/
Bainite block meta position reduces crackle and passes through martensite/bainite crystal boundary resistance to poor very little (≤5 °), therefore Mo is big
While amplitude improves armor plate strength, low-temperature flexibility, the elongation percentage of high-strength quenched and tempered steel are reduced；And when Mo addition is excessive,
The not only seriously elongation percentage of damage steel plate, weldability especially high heat-input weldability, but also the manufacturing cost of increase steel plate；But
For 800MPa grades of DQ type hardened and tempered steel plates, it is necessary to have certain Mo content, to guarantee that steel plate has enough harden ability and resists back
The fiery property of softening.Therefore comprehensively consider the phase transformation strengthening effect of Mo and the shadow to base material steel plate low-temperature flexibility, elongation percentage and weldability
It rings, suitable Mo content controls between 0.10%~0.30%.
The purpose of micro Nb element is added in steel is the through hardening for carrying out non-recrystallization controlled rolling, increasing the online DQ of rolled plate
Property, the microstructure of refinement base material steel plate improves the intensity and anti-temper softening characteristic of steel plate；Nb content range and C content model
There are best match sections between enclosing, in this section, while Nb plays best non-recrystallization controlled rolling and Strengthening and Toughening effect, and Nb
Steel plate weldability is damaged smaller；When therefore, using Ultra-low carbon composition design, Nb content range can be properly increased, to ensure height
The intensity of intensity hardened and tempered steel plate, low-temperature flexibility, anti-SR softening；When Nb additive amount is lower than 0.010%, cannot effectively play ultralow
The above-mentioned effect of Nb in carbon content steel plate；Upper bayesian is induced when Nb additive amount is more than 0.035%, under high heat-input welding condition
Body (Bu) is formed and Nb (C, N) secondary precipitation embrittling effect, and the serious low temperature for damaging high heat-input welding heat affected zone (HAZ) is tough
Property；Nb reduces the phase difference of bainite/martensite lath crystal boundary as carbide, greatly damage welded thin-wall box component
Low-temperature flexibility；Therefore suitable Nb content controls between 0.010%~0.035%.
Ti content is between 0.007%~0.014%, austenite grain mistake during inhibition heating of plate blank, rolling and DQ
Divide and grow up, improve steel plate low-temperature flexibility, it is often more important that inhibits HAZ crystal grain in high heat-input welding process to grow up, it is low to improve HAZ
Warm toughness；In addition, Ti has solid N effect, free N in steel is eliminated, guarantee B element is to be dissolved presence in the form of B；However, when Ti contains
Amount more than 0.014% when, under the conditions of high acid-soluble aluminum content, superfluous Ti on martensite/lath of bainite and on colony circle with
TiC coherence is precipitated, the high-strength quenched steel microscopic structure of serious embrittlement.
B content controls between 0.0010%~0.0018%, it is ensured that while steel plate harden ability, does not damage the weldering of steel plate
Connecing property, HAZ toughness and Surface Quality of Steel Billet.
Als in steel is capable of fixing the freedom [N] in steel, except welding heat affected zone (HAZ) is reduced freely [N], improves weldering
It connects except the low-temperature flexibility effect of HAZ, it is often more important that guarantee that there is certain solid solution B in steel, improve steel plate harden ability；Therefore
Als lower limit is controlled 0.025%；But excessive Als is added in steel not only and will cause casting difficulty, and can be formed in steel
The needle-shaped Al of a large amount of disperses2O3Field trash, damage steel plate endoplasm viability, low-temperature flexibility and weldability, therefore the Als upper limit controls
0.060%.
For V content between 0.025%~0.055%, and with the increase of steel plate thickness, V content can appropriate capping value.
Add V the purpose of be by V (C, N) in bainite/martensite lath disperse educt, improve DQ hardened and tempered steel plate intensity.V addition
Very few, the V (C, N) of precipitation very little, cannot effectively improve the intensity of 800MPa grades of DQ quenched and tempered steel；V additive amount is excessive, is higher than
0.055%, damage the low-temperature flexibility of steel plate low-temperature flexibility, elongation percentage, weldability and welded thin-wall box component.
In order to ensure being dissolved the presence of [B] in steel plate and a large amount of coarse AlN being prevented to be precipitated along original austenite crystal prevention, damage
Steel plate transverse impact toughness and plasticity, the N content in steel must not exceed 0.0055%.
To steel carry out Ca processing, on the one hand can further pure molten steel, on the other hand sulfide in steel is denaturalized
It is tough to be allowed to the red brittleness for becoming non-deformable, stablizing tiny spherical sulfide, inhibiting S, the low temperature of raising steel plate for processing
Property, elongation percentage and Z-direction performance, the anisotropy and weldability for improving steel plate toughness, furthermore handled using Ca, improve high dissolved aluminum
The casting of molten steel；The number of Ca additional amount, depending on the height of S content in steel, Ca additional amount is too low, and treatment effect is little；Ca
Additional amount is excessively high, and formation Ca (O, S) is oversized, and brittleness also increases, and can become fracture crack starting point, and the low temperature for reducing steel is tough
Property, elongation percentage and steel plate weldability, while also reduce purity of steel, pollution molten steel.General control Ca content presses ESSP=
(wt%Ca) [1-1.24 (wt%O)]/1.25 (wt%S), wherein ESSP is that sulphide inculsion shape controls index, therefore Ca contains
The OK range of amount is 0.0010%~0.0035%.
Inexpensive, 800MPa grades of hardened and tempered steel plates of high tenacity and superior weldability manufacturing method of the present invention, packet
Include following steps:
1) it smelts, cast
It smelted according to mentioned component, be casting continuously to form slab；
2) it rolls, steel plate overall compression ratio, that is, slab thickness/finished steel plate thickness >=3.5；
First stage is common rolling, and slab heating temperature controls between 1100 DEG C~1180 DEG C；It is rolled using big pressure
System, rolling pass reduction rate >=8% add up percentage pass reduction >=45%；
Second stage use non-recrystallization controlled rolling, 830 DEG C~880 DEG C of controlled rolling start rolling temperature, rolling pass reduction rate
>=7%, Unhydrated cement adds up reduction ratio >=50%, and 820 DEG C~850 DEG C of finishing temperature；
3) cooling
After non-recrystallization controlled rolling, steel plate is transported to immediately at cooling equipment, carries out acceleration cooling, steel to steel plate immediately
Plate opens 800 DEG C~830 DEG C of cold temperature, and cold temperature control is stopped at≤300 DEG C in cooling velocity >=7 DEG C/s；It is then fed into burial pit guarantor
Temperature, for steel plate from cold junction beam is stopped to the interval time entered the heat preservation of heated type burial pit no more than 30min, heat preservation method is steel plate
Temperature surface at least keeps the temperature 24 hours under conditions of being greater than 300 DEG C；
4) tempering process
Steel plate tempering temperature is 550~600 DEG C, tempering hold times T >=(0.60~1.00) × finished steel plate thickness t,
Tempering hold times are the soaking time for starting timing when steel plate central temperature reaches tempering target temperature, and time T unit is
Min, thickness t unit are mm；Steel plate natural air cooling is to room temperature after tempering.
The requirement such as the component system of steel plate, mechanical property and weldability, endoplasm viability (i.e. UT flaw detection) according to the present invention,
It is cast using continuous casting, the control of the basket pouring degree of superheat is at 8 DEG C~30 DEG C, and casting speed control is in 0.6m/min~1.0m/min, knot
The control of brilliant device liquid fluctuating is 2%~5% in≤5mm, solidification end slighter compress technique.
Step 2) controlled rolling, to ensure that superhigh intensity hardened and tempered steel plate microscopic structure is uniformly tiny, steel plate overall compression ratio (plate
Base thickness/finished steel plate thickness) >=3.5.
First stage is common rolling, to guarantee that [Al]+BN → AlN+ [B] occurs in heating and the operation of rolling, it is ensured that steel
In have enough solid solution B, slab heating temperature control between 1100 DEG C~1180 DEG C；Using big pressure rolling, rolling pass
Reduction ratio >=8% adds up percentage pass reduction >=45%, to guarantee the intermediate uniform tiny and enough solid solution B of base microscopic structure, is
Subsequent non-recrystallization controlled rolling and press quenching lay the foundation.
Second stage use non-recrystallization controlled rolling, 830 DEG C~880 DEG C of controlled rolling start rolling temperature, rolling pass reduction rate
>=7%, Unhydrated cement adds up reduction ratio >=50%, and 820 DEG C~850 DEG C of finishing temperature.
After step 3) non-recrystallization controlled rolling, steel plate is transported to immediately at DQ+ACC equipment, is added immediately to steel plate
Quickly cooling is but；Steel plate opens 800 DEG C~830 DEG C of cold temperature, and cold temperature control is stopped at≤300 DEG C in cooling velocity >=7 DEG C/s.
Thickness >=40mm steel plate from stop cold junction beam to enter heated type burial pit heat preservation interval time be not more than
30min, heat preservation method are at least to keep the temperature 24 hours under conditions of steel billet temperature surface is greater than 300 DEG C, guarantee that steel plate dehydrogenation is abundant,
Prevent hydrogen induced cracking.
In step 4) tempering process, steel plate tempering temperature (plate temperature) is 550~600 DEG C, and temperature is tempered when steel plate is relatively thin
Spend it is on the upper side limit, steel plate it is relatively thick when tempering temperature limit on the lower side, tempering hold times >=(0.60~1.00) × finished steel plate thickness
T is spent, tempering hold times are the soaking time for starting timing when steel plate central temperature reaches tempering target temperature, time T unit
For min, thickness t unit is mm；Steel plate natural air cooling is to room temperature after tempering.
Beneficial effects of the present invention:
The present invention is while obtaining excellent 800MPa grade high-strength hardened and tempered steel plate, the obdurability of steel plate, plasticity and toughness, welding
Craftsmanship is similarly excellent, and successfully solves the phase between high-strength hardened and tempered steel plate intensity, plasticity, low-temperature flexibility and weldability
Mutual contradiction improves security and stability, the anti-fatigue performance of large-scale weight steel construction；Press quenching not only reduce manufacturing process,
Shorten the manufacturing cycle, reduce steel plate manufacturing cost, it is often more important that, steel plate of the present invention using controlled rolling+online DQ+ from
Line tempering process has given full play to the potential of alloying element harden ability, and the through hardening of alloying element, hardenability obtain farthest
Play, can under conditions of seldom precious alloy content (such as Ni, Mo), very low carbon equivalent and Pcm, obtain it is high-intensitive,
Excellent strong plasticity is matched with plasticity and toughness and excellent weldability, this not only further reduces manufacturing cost, but also improves
The weldability of steel plate, particularly with high-strength hardened and tempered steel plate, Cold Cracking Susceptibility is greatly reduced, and welding pre-heating temperature is substantially
Degree reduces, postwelding is more wide in range without heat treatment (i.e. SR), suitable thermal weld stress amount range, correspondingly reduces user's processing
The cost and process of production shorten the time of user's steel member manufacture, create huge value, thus such steel for user
Plate is not only the product of high added value, green environmental protection.
Detailed description of the invention
Fig. 1 is microscopic structure (1/4 thickness) photo of 5 steel of the embodiment of the present invention.
Specific embodiment
The present invention will be further described with reference to the accompanying drawings and examples.
For composition of steel of the embodiment of the present invention referring to table 1,2~table of table 5 is the technological parameter of the embodiment of the present invention, and table 6 is this hair
The performance parameter of bright embodiment steel.
As shown in Figure 1, the present invention is combined by optimizing components design, TMCP and subsequent tempering process, steel plate it is micro-
Tissue is uniformly tiny lower bainite+lath martensite, and average colony size is at 20 μm or less.
The present invention is tempered T technique by the Combination Design and controlled rolling CR+ press quenching DQ+ of steel plate alloying element offline
It combines, while obtaining excellent 800MPa grade high-strength hardened and tempered steel plate, obdurability, plasticity and toughness, the welding usability of steel plate
It is also the same excellent, and successfully solve the mutual lance between high-strength hardened and tempered steel plate intensity, plasticity, low-temperature flexibility and weldability
Shield improves security and stability, the anti-fatigue performance of large-scale weight steel construction；Press quenching not only reduces manufacturing process, shortens
Manufacturing cycle reduces steel plate manufacturing cost, it is often more important that steel plate of the present invention using controlled rolling+press quenching DQ+ from
Line tempering process has given full play to the potential of alloying element harden ability, and the through hardening of alloying element, hardenability obtain farthest
Play, can under conditions of seldom precious alloy content (such as Ni, Mo), very low carbon equivalent and Pcm, obtain it is high-intensitive,
Excellent strong plasticity is matched with plasticity and toughness and excellent weldability, this not only further reduces manufacturing cost, but also improves
The weldability of steel plate, particularly with high-strength hardened and tempered steel plate, Cold Cracking Susceptibility is greatly reduced, and welding pre-heating temperature is substantially
Degree reduces, postwelding is more wide in range without heat treatment (i.e. SR), suitable thermal weld stress amount range, correspondingly reduces user's processing
The cost and process of production shorten the time of user's steel member manufacture, create huge value, thus such steel for user
Plate is not only the product of high added value, green environmental protection, meets the green energy conservation emission reduction production policy of country's promotion.
800MPa grade high-strength, high tenacity and superior weldability hardened and tempered steel plate of the present invention are mainly used as manufacture hydroelectric project
Penstocks, volute and steel bifurcated, large-scale engineering machinery structure and offshore platform are the key that the great developments of the national economy
Material.As Chinese national economy constantly develops, the requirement of economizing type harmonious society is built；It is national basis engineering construction, clear
Large-Scale Equipment needed for clean energy project construction (such as hydroelectric project, wind-powered electricity generation), ocean development construction and the development of the national economy manufactures
Exploitation has swung to a day thing agenda, quenched as strategic basic material -800MPa grade high-strength, high tenacity and superior weldability
Steel plate has a vast market foreground.
Claims (8)
1. 800MPa grades of low cost, high tenacity and superior weldability hardened and tempered steel plates, composition by weight percent are as follows:
C:0.05%~0.08%
Si :≤0.10%
Mn:1.55%~1.85%
P :≤0.013%
S :≤0.0030%
Cu:0.10%~0.40%
Ni:0.10%~0.40%
Cr:0.50%~0.90%
Mo:0.10%~0.30%
Nb:0.010%~0.035%
V:0.025%~0.055%
Ti:0.007%~0.014%
B:0.0010%~0.0018%
Als:0.025%~0.060%
N :≤0.0055%
Ca:0.001%~0.0035%,
Remaining is Fe and inevitable impurity；
And above-mentioned constituent content must simultaneously meet following relationship:
The control wide-angle lath of bainite/formation of martensite lath crystal boundary index χ >=2.1, χ=1.33 (%Mn)+(%Ni)+
0.55 (%Cu)+0.21 (%Cr) -0.93 (%Mo) -2.55 (%Nb) -1.91 (%Ti) -1.42 (%V)；
(%C) × [(%Si)+0.83 (%Mo)+1.12 (%Nb)+0.89 (%Als)+0.45 (%V)]≤0.031；
DI index × ζ × TIt opens cold×[(TIt opens cold-TStop cold)/(TIt opens cold+TStop cold)]/t >=1535, wherein
ζ is press quenching DQ through hardening sex factor, ζ value 1.4；
T is finished steel plate thickness, unit mm；
DI=0.367 (%C)0.5[1+0.7 (%Si)] [(1+3.33 (%Mn)] [(1+0.35 (%Cu)] [(1+0.36 (%
Ni)] [(1+2.16 (%Cr)] [(1+3 (%Mo)] [(1+1.75 (%V)] [(1+1.77 (%Al)] [(1+200 (%B)] ×
25.4, unit mm；
TIt opens coldFor the hardening heat of press quenching DQ, that is, accelerate cooling start temperature, TStop coldQuenching for press quenching DQ terminates
Temperature, that is, accelerate cooling stopping temperature, and temperature unit is DEG C；
Als content and (%Als) >=10 × [(%Nt) -0.292 (%Ti)]；
Ca is handled and Ca/S ratio is between 1.00~3.00.
2. 800MPa grades of low cost as described in claim 1, high tenacity and superior weldability hardened and tempered steel plates, characterized in that institute
The microscopic structure for stating steel plate is uniformly tiny lower bainite+lath martensite.
3. 800MPa grades of low cost as claimed in claim 1 or 2, high tenacity and superior weldability hardened and tempered steel plates, characterized in that
Tensile strength >=780MPa of the steel plate, yield strength >=690MPa, -50 DEG C of Charpy side knock function single value >=47J, break
Split elongation percentage δ5>=15%.
4. low cost as described in claim 1, the manufacturing method of 800MPa grades of hardened and tempered steel plates of high tenacity and superior weldability,
It is characterized in, includes the following steps:
1) it smelts, cast
Ingredient described in accordance with the claim 1 is smelted, is casting continuously to form slab；
2) it rolls, steel plate overall compression ratio, that is, slab thickness/finished steel plate thickness >=3.5；
First stage is common rolling, and slab heating temperature controls between 1100 DEG C~1180 DEG C；Using big pressure rolling, roll
Percentage pass reduction >=8% processed adds up percentage pass reduction >=45%；
Second stage use non-recrystallization controlled rolling, 830 DEG C~880 DEG C of controlled rolling start rolling temperature, rolling pass reduction rate >=
7%, Unhydrated cement adds up reduction ratio >=50%, and 820 DEG C~850 DEG C of finishing temperature；
3) cooling
After non-recrystallization controlled rolling, steel plate is transported to immediately at cooling equipment, carries out acceleration cooling to steel plate immediately, and steel plate is opened
800 DEG C~830 DEG C of cold temperature, cold temperature control is stopped at≤300 DEG C in cooling velocity >=7 DEG C/s；It is then fed into burial pit heat preservation,
For steel plate from cold junction beam is stopped to the interval time entered the heat preservation of heated type burial pit no more than 30min, heat preservation method is steel plate temperature
Degree surface at least keeps the temperature 24 hours under conditions of being greater than 300 DEG C；
4) tempering process
Steel plate tempering temperature is 550~600 DEG C, tempering hold times T >=(0.60~1.00) × finished steel plate thickness t, tempering
Retention time is the soaking time for starting timing when steel plate central temperature reaches tempering target temperature, and time T unit is min, thick
Degree t unit is mm；Steel plate natural air cooling is to room temperature after tempering.
5. low cost as claimed in claim 4, the manufacturing method of 800MPa grades of hardened and tempered steel plates of high tenacity and superior weldability,
It is characterized in, step 1) is cast using continuous casting, and the basket pouring degree of superheat is controlled at 8 DEG C~30 DEG C, and casting speed control is in 0.6m/min
~1.0m/min, liquid level fluctuation of crystallizer control are 2%~5% in≤5mm, solidification end slighter compress technique.
6. inexpensive as described in claim 4 or 5,800MPa grades of hardened and tempered steel plates of high tenacity and superior weldability manufacturer
Method, characterized in that the microscopic structure of the steel plate is uniformly tiny lower bainite+lath martensite, and average colony size exists
20 μm or less.
7. inexpensive as described in claim 4 or 5,800MPa grades of hardened and tempered steel plates of high tenacity and superior weldability manufacturer
Method, characterized in that tensile strength >=780MPa, yield strength >=690MPa, -50 DEG C of Charpy side knock function lists of the steel plate
A value >=47J, fracture elongation δ5>=15%.
8. low cost as claimed in claim 6, the manufacturing method of 800MPa grades of hardened and tempered steel plates of high tenacity and superior weldability,
It is characterized in, tensile strength >=780MPa of the steel plate, yield strength >=690MPa, -50 DEG C of Charpy side knock function single values
>=47J, fracture elongation δ5>=15%.
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| CN112746218B (en) * | 2019-12-30 | 2021-11-16 | 宝钢湛江钢铁有限公司 | Low-cost, high-crack-resistance and high-heat-input-welding YP 420-grade steel plate and manufacturing method thereof |
| CN113322420A (en) * | 2020-02-28 | 2021-08-31 | 宝山钢铁股份有限公司 | Yield ratio controlled steel with excellent low-temperature impact toughness and manufacturing method thereof |
| CN113737088A (en) * | 2020-05-28 | 2021-12-03 | 宝山钢铁股份有限公司 | 800 MPa-grade steel plate with low yield ratio, high toughness and high weldability and manufacturing method thereof |
| CN113832413A (en) * | 2020-06-23 | 2021-12-24 | 宝山钢铁股份有限公司 | Ultra-thick 800 MPa-grade quenched and tempered steel plate with excellent core low-temperature impact toughness and weldability and manufacturing method thereof |
| CN112522479A (en) * | 2020-10-30 | 2021-03-19 | 大冶特殊钢有限公司 | Cooling method for steel pipe or round bar |
| CN112522479B (en) * | 2020-10-30 | 2022-10-11 | 大冶特殊钢有限公司 | Cooling method for steel pipe or round bar |
| CN115537681A (en) * | 2021-06-30 | 2022-12-30 | 宝山钢铁股份有限公司 | 500 MPa-grade steel plate with high toughness, low yield ratio and low longitudinal and transverse strength anisotropy and manufacturing method thereof |
| CN115537681B (en) * | 2021-06-30 | 2023-10-17 | 宝山钢铁股份有限公司 | High-toughness low-yield ratio low-longitudinal-transverse-strength anisotropic 500 MPa-grade steel plate and manufacturing method thereof |
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