CN109055858A - A kind of the welding structure fire-resistant and weather-resistant steel and its production method of yield strength >=620MPa - Google Patents
A kind of the welding structure fire-resistant and weather-resistant steel and its production method of yield strength >=620MPa Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- 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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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
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- 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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- 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
- 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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- C22C38/08—Ferrous alloys, e.g. steel alloys containing nickel
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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
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
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- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
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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
- C22C38/16—Ferrous alloys, e.g. steel alloys containing copper
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Abstract
The present invention relates to the welding structure fire-resistant and weather-resistant steel of yield strength >=620MPa a kind of and its production methods, its main component and mass percent are as follows: C 0.035~0.075%, Si 0.13~0.24%, Mn 1.56~1.82%, P≤0.003%, S≤0.002%, Mo 0.12~0.23%, W 0.21~0.40%, Cu 0.22~0.48%, Ni 0.21~0.43%, Nb 0.026~0.048%, V 0.058~0.077%, Ti 0.045~0.068%, Ca 0.0022~0.0052%, Ta 0.0028~0.0065%.Weathering steel provided by the invention has good mechanical property, excellent fire resistance, weather resistance and anti-lamellar tearing performance, also has excellent welding performance.
Description
Technical field
The invention belongs to low-alloy high-strength steel manufacturing technology fields, are related to the welding structure of yield strength >=620MPa a kind of
With fire-resistant and weather-resistant steel and its production method.
Background technique
With the continuous development of Ferrous Metallurgy technology, the structural members such as column, the beam of steel construction are anti-to armor plate strength, fire-resistance
Calamity, anticorrosion, antidetonation etc. performance propose new demand, and normal steel structure fire-resistance poor in building trade is combated a natural disaster
Baptism is then faced with anti-corrosion capability.In recent years, domestic and international metallargist has actively developed fire resisting, weather-proof, antidetonation
Etc. Series Steels research, the disadvantage that normal steel structure fire-resistance combats a natural disaster Corrosion Protection difference can be not only made up using fire-resistant and weather-resistant steel, greatly
It is big to reduce fireproof coating and weathering resistance coatings, environmental pollution is reduced, resource and efficiency of energy utilization can also be improved, is met national big
Political affairs guideline mandates, therefore, in the long run, structure is that building structure industry has the excellent of huge potential demand with fire-resistant and weather-resistant steel
Matter steel, market value are inestimable.
Chinese invention patent application number CN1354273A discloses a kind of high-performance refractory weather-resisting building steel and its production
The construction(al)steel of method, the application for a patent for invention contains C, Si, Mn, P, S, Cr, Mo, Ti, Als, N, O, Cr, Ni, Cu, Ca, B,
Additionally containing one of Nb, V, RE or more than one, surplus Fe makes steel have height by smelting, rolling and heat treatment
Intensity, high tenacity, excellent fire resisting and weather resistance.But the shortcomings that application for a patent for invention is to cause to weld containing more P content
It is poor to connect performance, and steel plate need to carry out normalizing+tempering, process route is complicated, higher cost, while the intensity rank of steel plate
It is lower.
Chinese invention patent application number CN201110247615.0, CN200910011963.0, CN200910272414.9,
Chinese invention patent disclosed in CN200910045146.7, CN201110080774.6, invention product all have good
Fire resistance, but the disadvantage is that do not have weather resistance；Separately have Chinese invention patent application number CN201010113848.7,
Chinese invention patent disclosed in CN03804658.X, CN200910056602.8, invention product all have good weatherability
Can, but the disadvantage is that do not have fire resistance.
Chinese invention patent application number CN201110247615.0 discloses a kind of refractory anti-seismic construction steel, chemistry at
Divide (by weight percentage) are as follows: C:0.1%~0.18%, Si:0.1%~0.50%, Mn:1%~1.80%, P≤
0.025%, S≤0.015%, Cr≤0.50%, Mo≤0.30%, Al≤0.04%, N≤0.007%, Ca≤0.006%, with
And Nb≤0.050%, V≤0.055%, one or more of Ti≤0.035%, and Nb+V+Ti≤0.055%, it is remaining
For iron and inevitable impurity.Its manufacturing method includes: 1180 DEG C of heating temperature, keeps the temperature 3h, start rolling temperature >=1180 DEG C, control
Zha Mo tri- adds up reduction ratio >=35%, and finishing temperature is 860~900 DEG C, and Direct Air-Cooled is to room temperature after finish to gauge, or with 5~15
DEG C/s cooling rate is cooled to room temperature.The steel obtained in this way has excellent fire resistance, Rp0.2(600 DEG C of yield strengths)/Rp0.2(room temperature
Yield strength) >=2/3, have low yield tensile ratio (yield tensile ratio Rp0.2/Rm≤ 0.75), anti-seismic performance is good.The patent document invention is only
It is limited to yield strength 235~460MPa steel grade, P, S content are more in steel, it has a certain impact to subsequent welding performance, in addition,
The steel grade does not have good weather resistance yet.
It is low in the wrong that Chinese invention patent application number CN200910180490.7 discloses a kind of non-quenched acicular structure high strength
The ingredient and its basis weight percent for including than weathering steel and preparation method thereof, the steel grade by force are as follows: C:0.03%~
0.08%, Si:0.30%~0.60%, Mn:1.30%~1.80%, P≤0.015%, S≤0.010%, Cu:0.30%~
0.60%, Ni:0.20%~0.50%, Cr:0.40%~0.80%, Mo:0.10%~0.40%, Nb:0.030%~
0.080% and Ti≤0.04%；Optional component: two kinds in Als≤0.04% and RE≤0.40kg/t steel or Ca≤0.005%
Or it is two or more；And the Fe and impurity of surplus, welding cold crack sensitivity coefficient is low, and corrosion resistance index is high.The invention steel
Although kind of ingredient is simple, there is excellent mouldability, weatherability, weldability and low-temperature flexibility, while its preparation process is simple, nothing
It needs to be heat-treated, with short production cycle, the low feature of production cost.But it contains more Ni, Cu noble element, and does not have fire resisting
Performance.
Chinese invention patent application number CN200910056602.8 discloses a kind of yield strength in 700MPa or more toughness
Excellent high corrosion-resistant weathering steel containing Cr and its manufacturing method.The ingredient percent content of the weathering steel are as follows: C:
0.02%~0.10%, Si:0.1%~0.4%, Mn:0.3%~1.3%, P≤0.01%, S≤0.006%, Cu:0.2%
~0.5%, Cr:2.5%~10%, Ni:0.2%~1.0%, Nb:0.02%~0.06%, Al:0.01%~0.05%, N
≤ 0.005%, Ti:0.02%~0.10%, remaining is Fe and inevitable impurity.Steel plate made of the steel has
The yield strength of 700MPa or more and excellent toughness, while its relatively corrosive rate reduces by 1 times than traditional weathering steel, meets railway
Vehicle steel improves corrosion resistant requirement.But it is researched and developed mainly for rolling stock with steel, is produced using hot continuous rolling coiling technique,
Cr element in steel containing more amount is unfavorable for steel plate welding and low-temperature flexibility, in addition, steel grade does not have fire resistance yet.
In addition, Chinese invention patent application number CN103695772A and CN103695773A individually disclose yield strength is
550MPa grades of fire resistant and weather resistant anti-shock construction(al)steels and its production method and yield strength are 690MPa grades of fire resistant and weather resistant anti-shock buildings
With steel and its production method, which contains C, Si, Mn, P, S, Nb, Ti, Mo, W, Mg, O, this
Outside also containing Sb or Zr or its two kinds of mixtures with arbitrary proportion, remaining is Fe and is inevitably mingled with, de- by molten iron
Sulphur, converter smelting, vacuum processing, addition Mg element, conventional continuous casting simultaneously roll slab heating, segmentation, cool down after finish to gauge
Etc. techniques, make steel have excellent fire resisting, weather-proof and anti-seismic performance, high comprehensive performance, but the shortcomings that both steel be weldering
It connects performance and corrosion resistance is less desirable.
Summary of the invention
It is strong the technical problem to be solved by the present invention is to aiming at the above shortcomings existing in the prior art, provide a kind of surrender
Degree >=620MPa welding structure fire-resistant and weather-resistant steel and its production method optimize chemical component and production technology, make production
Product have high-strength tenacity, high-ductility, low yield strength ratio, excellent fire resistance, weather resistance and anti-lamellar tearing performance, this
Also there is good welding performance and cold-forming property outside.
In order to solve the above technical problems, present invention provide the technical scheme that
The welding structure fire-resistant and weather-resistant steel of yield strength >=620MPa a kind of, component and mass percentage are provided
Are as follows: C:0.035~0.075%, Si:0.13~0.24%, Mn:1.56~1.82%, P≤0.003%, S≤0.002%, Mo:
0.12~0.23%, W:0.21~0.40%, Cu:0.22~0.48%, Ni:0.21~0.43%, Nb:0.026~
0.048%, V:0.058~0.077%, Ti:0.045~0.068%, Ca:0.0022~0.0052%, Ta:0.0028~
0.0065%, [N]: 0.0022~0.0057%, [O]: 0.0024~0.0042%, remaining is Fe and inevitable impurity,
Meet simultaneously: 1. (Ca+2Ta)/3 [O]=1.32~1.65,2. 4 (15C+Mo+2W)+3 (Mn+Cu)=11.52~13.61%,
3. Pcm (%)=C+Si/30+ (Mn+Cu)/20+Ni/60+Mo/15+V/10≤0.20%.
The present invention also provides the production methods of the welding structure fire-resistant and weather-resistant steel of above-mentioned yield strength >=620MPa, including
Smelt and pour into the processing steps such as slab, slab heating, high pressure water dephosphorization, controlled rolling, section cooling, specific process step
It is as follows:
1) it smelts and pours into slab: molten iron smelt and casting is handled, formation slab, control Ca:0.0022~
0.0052%, Ta:0.0028~0.0065%, and vacuum processing time >=30min；
2) slab heats: slab is heated to 700~720 DEG C with the rate of heat addition of 6.0~7.0 DEG C/s, then with 7.1~
The rate of heat addition of 8.8 DEG C/s is heated to 830~890 DEG C, then 1180 are heated to the rate of heat addition of 9.0~11.5 DEG C/s~
1230 DEG C, and 32~42min is kept the temperature, tapping temperature is controlled at 1120~1150 DEG C, horizontal high voltage water dephosphorization of going forward side by side processing；
3) controlled rolling: being divided into I stage, II stage and III stage rolling, and the I stage rolling start rolling temperature is not less than
1100 DEG C, finishing temperature is 1060~1080 DEG C, and rolling pass is 3~5, and passage total reduction is 50~60%；Described II
Stage rolling start rolling temperature is 1020~1050 DEG C, and rolling pass is 3~5, and single pass reduction ratio is 15~25%, rolling knot
Slab is after beam with a thickness of (h+40) mm；The III stage rolling start rolling temperature is ± 5 DEG C of (980-9h/4), and finishing temperature is
± 5 DEG C of (880-7h/8), rolling pass are 4~6, and it is 30~35% that last three passages, which add up reduction ratio, and it is single that wherein h, which is with mm,
The finished product thickness value of position；
4) section cooling: the slow cooling of 2~8s relaxation is carried out to steel plate after III stage rolling, section cooling is then carried out, opens cold
Temperature control is 400~450 DEG C in 12~18 DEG C/s, cooling red temperature in ± 5 DEG C of (760+3h/4), cooling velocity control,
It is finally air-cooled to room temperature and obtains yield strength >=620MPa welding structure fire-resistant and weather-resistant steel, wherein h is as unit of mm
Finished product thickness value.
Further, upper the ratio between water and lower water are controlled 0.79~0.92 when the step 4) section cooling.
The selection reason of each chemical constituent of the invention:
Carbon (C): C element is to ensure that the essential element of steel strength, mainly improves intensity by gap solution strengthening,
Having simultaneously reduces yield tensile ratio effect.C also forms fine carbide in conjunction with Nb, V in steel, Ti, Mo, elements such as w or carbon nitrogenizes
Substance point has refined crystalline strengthening and precipitation enhancement, to further increase intensity, improve low-temperature impact toughness and weldability
Energy.In order to ensure the above-mentioned effect of C element, content must not be lower than 0.035%, and C content increase will lead to Fe3C and M-A tissue
Increase, aggravates to generate cold crack tendency when carbon segregation and welding, then impaired low temperature impact toughness, welding performance and cold and hot
Processing performance.Therefore C content is limited to 0.035~0.075%.
Silicon (Si): the main function of Si element is solution strengthening and deoxidation, since the present invention is added to Ca and Ta element,
There is stronger binding force with [O] and form fine oxide, deoxidation is played, to balance and ensuring low-temperature flexibility and weldability
Can be without damage, it only adds a small amount of Si and plays solution strengthening effect.Therefore Si content is limited to 0.13~0.24%.
Manganese (Mn): Mn element is to ensure that steel obdurability and the indispensable element of Low Temperature Impact Toughness of Heat-affected Zone, in right amount
Mn can eliminate the hot-short influence of S, O on steel, improve steel processing performance and cold short tendency, while having refined crystalline strengthening effect,
Intensity is improved, plasticity and low-temperature flexibility are improved.To ensure the above-mentioned effect of Mn, Mn content must not be lower than 1.56%, and excess Mn
Slacken iron atom binding force when heated, accelerate iron atom self-diffusion, promote Austenite Grain Growth, be unfavorable for low-temperature flexibility and
Welding performance.Therefore Mn content is limited to 1.56~1.82%.
Phosphorus (P): P element is the objectionable impurities elements in steel, although P can improve corrosion resistance, easily leads to segregation, promotes to add
Austenite is grown up when hot, seriously damages low-temperature flexibility.
Sulphur (S): as P element, S element is also the objectionable impurities elements in steel, and S and Mn easily form coarse MnS and press from both sides
It is miscellaneous, low-temperature flexibility and thickness directional properties are not only damaged, formation of crack is also easily become.
Molybdenum (Mo): the main function of Mo element is solution strengthening and reduces yield tensile ratio, and Mo, which belongs to, reduces austenitic area element,
Promote austenite transition curve to move to right, promotes the bainite of high density dislocation substructure to be formed, significantly improve room temperature and high temperature is strong
Degree.Appropriate Mo can also form refractory carbides, and the fine carboritride of more Nb, V is promoted to be precipitated, these compounds are adding
Austenite Grain Growth can be effectively hindered when hot, it is ensured that steel heat resistance with higher under high temperature.But excessively high Mo exists
It is quickly cooled down and welds in cooling procedure and easily obtain massive martensite, impaired low temperature toughness and welding performance.Therefore Mo content limits
It is set to 0.12~0.23%.
Tungsten (W): as Mo, the main function of W element is also solution strengthening, while appropriate W can also form infusibility carbonization
Object can alleviate the accumulation process of carbide, keep higher elevated temperature strength in higher temperature tempering.But excessively high W is unfavorable for
Low-temperature flexibility and welding performance, in order to ensure steel have excellent high temperature strength and low-temperature flexibility and welding performance are not damaged
Evil, is limited to 0.21~0.40% for W content.
Copper (Cu): the outstanding role of Cu element is the weather-resistant performance for improving steel, has both solid solution and precipitation strength
(ε-Cu) effect, and appropriate Cu does not reduce low-temperature flexibility and welding performance.But when Cu content is higher, not to thermal deformation processing
Benefit leads to copper brittleness phenomenon in thermal processing distortion, and is unfavorable for low-temperature flexibility and welding performance.Therefore Cu content be limited to 0.22~
0.48%.
Nickel (Ni): Ni reinforced ferrite and refines pearlite in steel, has certain effect to intensity is improved, improves simultaneously
Weather-resistant performance.Ni can also improve steel to the drag of fatigue and reduce steel to the sensibility of notch, and it is crisp to reduce low temperature
Sex reversal temperature significantly improves the low-temperature flexibility of steel.But excess Ni easily makes surface of steel plate generate a large amount of iron scales, significant to dislike
Change surface quality.Therefore Ni content is limited to 0.21~0.43%.
Niobium (Nb): Nb element category carbide has significant refined crystalline strengthening and precipitation enhancement, is mentioning
Impact flexibility and plasticity are further improved while high-intensitive, reduce ductile-brittle transition temperature.Nb still reduces austenite phase p-block element p,
Austenite recrystallization temperature is improved, steel machining deformation at relatively high temperatures can be made, pass through recrystallization softening austenite grain.With
Appropriate Mo is added jointly can also promote the tiny carboritride of more Nb to be precipitated, thinning microstructure crystal grain, improve intensity and low temperature punching
Hit toughness, it is ensured that high-temperature behavior.But excess Nb will cause occur a large amount of island M/A tissues in welding cooling procedure, influence heat affecting
Low-temperature flexibility.Therefore Nb content is limited to 0.026~0.048%.
Vanadium (V): V element category carbide has refinement crystal grain and precipitation enhancement.When Nb is compound with V
When addition, it can obviously improve the generation of transversal crack phenomenon, significantly improve recrystallization temperature.Being added jointly with appropriate Mo can also promote
The tiny carboritride of the preferable V of more high-temperature stabilities is precipitated, to improve fire resistance.V also has both solid in the present invention
Molten reinforcing and reduction yield tensile ratio effect, therefore V content must not be lower than 0.055%, when V content is excessively high, though be conducive to improve strong
Degree, but compromise low-temperature flexibility and welding performance.Therefore V content is limited to 0.058~0.077%.
Titanium (Ti): Ti element also belongs to strong carbonitride-forming elements, can refine crystal grain and improving welding property.With Ca,
Ta adds the ultra fine compound particle that can be precipitated containing Ti jointly, effective dimensions at 1.05 μm hereinafter, can effectively prevent heating and
Austenite Grain Growth in welding process.Ti, which combines addition with Nb, V, can further increase austenite recrystallization temperature, be conducive to
High temperature process deformation, avoids mixed grain structure.When Ti too high levels, larger-size Ti, Ca, Ta compound particle is formed, is being added
It is unfavorable for fining austenite grains in heat and welding process.Therefore Ti content is limited to 0.045~0.068%.
Calcium (Ca): Ca element is important element of the invention, and appropriate Ca not only promotes strip MnS inclusion balling and equal
Even distribution can also refine spherical impurities, make its equivalent diameter at 2.0 μm hereinafter, being effectively improved low-temperature flexibility, extensibility
Energy, welding performance and anti-lamellar tearing performance；More importantly these spherical impurities sizes are smaller, with basal body interface
Intensity is higher, in cold deformation, is less susceptible to become hole forming core core, to postpone hole formation, improves tensile strength,
Reduce yield tensile ratio.But excess amount of Ca will will form the larger-size mixing containing Ca and be mingled with, and be unfavorable for low-temperature flexibility, extension property, resist
Lamellar tearing performance and reduction yield tensile ratio.Therefore Ca content is limited to 0.0022~0.0057%.
Tantalum (Ta): Ta element is also important element of the invention, as Nb and carbide former, in addition to mentioning
High tenacity can also significantly improve corrosion resisting property.Another important function of Ta is to combine the fine oxygen formed with [O] in the present invention
Compound particle is alternatively arranged as MnS and phase deformed nucleus core, thinning microstructure crystal grain improves low-temperature flexibility in addition to improving high-temperature behavior
And welding performance.In order to ensure the above-mentioned effect of Ta, when content must not be lower than 0.0025%, when Ta content is more than 0.0065%
When, then it will form larger-size field trash containing Ta, be unfavorable for improving low-temperature flexibility and high-temperature behavior.Therefore Ta content is limited to
0.0028~0.0065%.
Nitrogen (N): the elements such as Nb, Ti, V, C form nitride or carbonitride in N element and steel, are tissue crystal grain refinements
Important element.If when [N] < 0.0022%, unit area nitride particles limited amount, thinning microstructure effect is weaker.As [N]
N is dissolved when > 0.0057%, in steel to increase, and is increased aging sensitivity, is also unfavorable for surface quality of billet.Therefore N content is limited to
0.0022~0.0057%.
Oxygen (O): O element belongs to pernicious gas in steel, under normal circumstances, O content strictly need to be limited in reduced levels.
As [O] < 0.0024%, then unit area formed Ta, Ca fine oxide particles negligible amounts；To avoid a large amount of big rulers
Very little field trash, then O content should be not higher than 0.0042%.Therefore O content is limited to 0.0024~0.0042%.
It must also meet simultaneously: 1. (Ca+2Ta)/3 [O]=1.32~1.65,2. 4 (15C+Mo+2W)+3 (Mn+Cu)=
11.52~13.61%, 3. Pcm (%)=C+Si/30+ (Mn+Cu)/20+Ni/60+Mo/15+V/10≤0.20%.
In steel of the present invention, as (Ca+2Ta)/3 [O] < 1.32, the metamorphism of Ca nodularization MnS field trash is unobvious, together
When unit area Ca, Ta fine oxide particles negligible amounts a large amount of big rulers will occur as (Ca+2Ta)/3 [O] > 1.65
Very little complexity field trash, is unfavorable for comprehensive performance；As 4 (15C+Mo+2W)+3 (Mn+Cu) < 11.52%, it cannot ensure that steel has
Excellent comprehensive performance, as 4 (15C+Mo+2W)+3 (Mn+Cu) > 13.61%, impaired low temperature toughness and welding performance, and close
Golden increased costs；The present invention claims Pcm (%)=C+Si/30+ (Mn+Cu)/20+Ni/60+Mo/15+V/10≤0.20%, with
Ensure that product of the present invention has good welding performance.
For steel of the present invention in addition to containing above-mentioned chemical component, surplus is Fe and inevitable impurity.
The selection reason of the technological parameter of steel of the present invention:
In order to accurately control Ca and Ta content and ensure that it can play a significant role, present invention selection is added in RH furnace
Ca and Ta alloy, while in order to ensure performances such as purity of steel, low-temperature flexibility and anti-lamellar tearings, vacuum processing time is not
It obtains and is lower than 30min.
Heating speed too fast the problems such as making steel billet generate underbead crack, taking into account energy consumption and rhythm of production in order to prevent, palpus
Heating speed is controlled within the scope of steel billet different temperatures；Selection in 1180~1230 DEG C of 32~42min of heat preservation, it is therefore an objective to promote W,
The alloys such as Mo are substantially soluble in austenite, prevent component segregation, and keep each spot temperature of steel billet full and uniform, separately may additionally facilitate to be formed
The particle of fine oxide containing Ta gives full play to its effect for preventing Austenite Grain Growth.
The present invention is rolled using three stage controls, and to the passage and start rolling temperature, finish to gauge of each rolling sequence of strict control
Temperature, then be aided with relaxation slow cooling appropriate and laminar flow rapid cooling and on be lauched the limitation than equal technological parameters, especially laminar flow is cold
But the limitation of start temperature and cooling velocity can ensure that (standard) that product obtains bainite and percent by volume is 15~30%
Polygonal ferrite two-phase structure, appropriate (standard) polygonal ferrite can be surrendered continuously in cold deformation, and it is strong to reduce surrender
Degree, and bainite may insure product tensile strength with higher, so that it is guaranteed that product has compared with low yield strength ratio；It is even more important
Be that equivalent dimension can be obtained and organized on 0.25 μm of tiny island M/A below for being evenly distributed under above-mentioned cooling technique parameter,
It is higher with basal body interface intensity since the island M/A equivalent dimension is smaller, therefore Micro-v oid shape can be effectively postponed when cold deformation
At the postponement island M/A separates (fracture) with matrix, so that it is guaranteed that product has excellent plastic property (elongation percentage).
The beneficial effects of the present invention are: 1, welding structure provided by the invention with fire-resistant and weather-resistant steel have high-strength tenacity,
High-ductility, low yield strength ratio, excellent fire resistance, weather resistance and anti-lamellar tearing performance also have excellent weldability
Can, and be not required to preheat before welding, postwelding is not required to be heat-treated, and has good cold and hot working performance, has anti-large deformation drag；
2, production method manufacturing process provided by the invention is simple, is easy to be mass produced, and can be implemented in each smelter.
Specific embodiment
Technical solution in order to enable those skilled in the art to better understand the present invention makees the present invention below with reference to embodiment
It is described in further detail.
Embodiment 1-9
The embodiment of the present invention prepares the welding structure fire-resistant and weather-resistant steel of yield strength >=620MPa a kind of, component and matter
Measure percentage composition are as follows: C:0.035~0.075%, Si:0.13~0.24%, Mn:1.56~1.82%, P≤0.003%, S≤
0.002%, Mo:0.12~0.23%, W:0.21~0.40%, Cu:0.22~0.48%, Ni:0.21~0.43%, Nb:
0.026~0.048%, V:0.058~0.077%, Ti:0.045~0.068%, Ca:0.0022~0.0052%, Ta:
0.0028~0.0065%, [N]: 0.0022~0.0057%, [O]: 0.0024~0.0042%, remaining is for Fe and unavoidably
Impurity, meet simultaneously: 1. (Ca+2Ta)/3 [O]=1.32~1.65,2. 4 (15C+Mo+2W)+3 (Mn+Cu)=11.52~
13.61%, 3. Pcm (%)=C+Si/30+ (Mn+Cu)/20+Ni/60+Mo/15+V/10≤0.20%.
Its production method includes smelting and pouring into slab, slab heating, high pressure water dephosphorization, controlled rolling, section cooling
Etc. processing steps, the specific process steps are as follows:
1) it smelts and pours into slab: molten iron smelt and casting is handled, formation slab, control Ca:0.0022~
0.0052%, Ta:0.0028~0.0065%, and vacuum processing time >=30min；
2) slab heats: slab is heated to 700~720 DEG C with the rate of heat addition of 6.0~7.0 DEG C/s, then with 7.1~
The rate of heat addition of 8.8 DEG C/s is heated to 830~890 DEG C, then 1180 are heated to the rate of heat addition of 9.0~11.5 DEG C/s~
1230 DEG C, and 32~42min is kept the temperature, tapping temperature is controlled at 1120~1150 DEG C, horizontal high voltage water dephosphorization of going forward side by side processing；
3) controlled rolling: being divided into I stage, II stage and III stage rolling, and the I stage rolling start rolling temperature is not less than
1100 DEG C, finishing temperature is 1060~1080 DEG C, and rolling pass is 3~5, and passage total reduction is 50~60%；Described II
Stage rolling start rolling temperature is 1020~1050 DEG C, and rolling pass is 3~5, and single pass reduction ratio is 15~25%, rolling knot
Slab is after beam with a thickness of (h+40) mm；The III stage rolling start rolling temperature is ± 5 DEG C of (980-9h/4), and finishing temperature is
± 5 DEG C of (880-7h/8), rolling pass are 4~6, and it is 30~35% that last three passages, which add up reduction ratio, and it is single that wherein h, which is with mm,
The finished product thickness value of position；
4) section cooling: the slow cooling of 2~8s relaxation is carried out to steel plate after III stage rolling, then carries out section cooling, laminar flow
Upper the ratio between water and lower water control opens cold temperature control in ± 5 DEG C of (760+3h/4), cooling speed 0.79~0.92 when cooling
In 12~18 DEG C/s, cooling red temperature is 400~450 DEG C for degree control, be finally air-cooled to room temperature obtain yield strength >=
The welding structure fire-resistant and weather-resistant steel of 620MPa, wherein h is the finished product thickness value as unit of mm.
According to steel chemical composition of the present invention and manufacturing technique requirent, 9 batches of steel of the invention are smelted and have rolled, while by biography
Process conditions of uniting prepare a collection of weathering steel, are denoted as Examples 1 to 9 and comparative example respectively, Examples 1 to 3 product with a thickness of
24mm, 4~6 product of embodiment with a thickness of 48mm, 7~9 product of embodiment with a thickness of 72mm, comparative example product thickness is
48mm.The component and mass percentage of embodiment 1-9 and comparative example steel product are shown in Table 1, the main technologic parameters of each embodiment
Comparative example is shown in Table 2, and the mechanical property test of each embodiment and comparative example the results are shown in Table 3.
As can be seen from Table 3, through vertical to steel plate of the present invention progress normal tensile property, Z-direction tensile property, -40 DEG C and -60 DEG C
To ballistic work, 600 DEG C of high-temperature behaviors and leaching corrosion rate test in 264h weeks, as the result is shown: object performance of the present invention: 662MPa
≤ReL≤ 679MPa, 868MPa≤Rm≤ 889MPa, 0.745≤ReL/Rm≤ 0.772,30.5%≤A≤33.5%, 70%≤
Zz≤77%, R when 516MPa≤600 DEG CP0.2≤ 530MPa, 331J≤- 40 DEG C of KV2≤ 346J, 273J≤- 60 DEG C of KV2≤
Leaching corrosion rate is lower than 0.305g/m within 300J, 264h weeks2H, and the yield strength of comparative example and embodiment be in same level, but
Tensile strength is significantly lower than embodiment, and the yield tensile ratio of compared steel is caused to be higher than 0.80, in addition, the Z-direction tensile property of comparative example ,-
40 DEG C are significantly less than embodiment with -60 DEG C of impact of collision function, 600 DEG C of high-temperature behaviors, but 264h weeks leaching corrosion rate is then obvious
Higher than embodiment, this explanation is compared with the product that 1-9 of the embodiment of the present invention is produced, the steel product corrosion resistance of comparative example production
It is poor.Steel product provided by the invention has a superior comprehensive mechanical property, high-strength tenacity, low yield strength ratio and excellent resistance to
Fiery, weather-proof, anti-layer tear resistance and welding performance.
Claims (3)
1. a kind of welding structure fire-resistant and weather-resistant steel of yield strength >=620MPa, which is characterized in that its component and quality percentage
Content are as follows: C:0.035~0.075%, Si:0.13~0.24%, Mn:1.56~1.82%, P≤0.003%, S≤
0.002%, Mo:0.12~0.23%, W:0.21~0.40%, Cu:0.22~0.48%, Ni:0.21~0.43%, Nb:
0.026~0.048%, V:0.058~0.077%, Ti:0.045~0.068%, Ca:0.0022~0.0052%, Ta:
0.0028~0.0065%, [N]: 0.0022~0.0057%, [O]: 0.0024~0.0042%, remaining is for Fe and unavoidably
Impurity, meet simultaneously: 1. (Ca+2Ta)/3 [O]=1.32~1.65,2. 4 (15C+Mo+2W)+3 (Mn+Cu)=11.52~
13.61%, 3. Pcm=C+Si/30+ (Mn+Cu)/20+Ni/60+Mo/15+V/10≤0.20%.
2. a kind of production method of the welding structure fire-resistant and weather-resistant steel of yield strength >=620MPa described in claim 1, packet
It includes to smelt and pour into processing steps, the features such as slab, slab heating, high pressure water dephosphorization, controlled rolling, section cooling and exist
In, the specific process steps are as follows:
1) it smelts and pours into slab: molten iron smelt and casting is handled, formation slab, control Ca:0.0022~
0.0052%, Ta:0.0028~0.0065%, and vacuum processing time >=30min；
2) slab heats: slab is heated to 700~720 DEG C with the rate of heat addition of 6.0~7.0 DEG C/s, then with 7.1~8.8 DEG C/
The rate of heat addition of s is heated to 830~890 DEG C, is then heated to 1180~1230 DEG C with the rate of heat addition of 9.0~11.5 DEG C/s,
And 32~42min is kept the temperature, tapping temperature is controlled at 1120~1150 DEG C, horizontal high voltage water dephosphorization of going forward side by side processing；
3) controlled rolling: being divided into I stage, II stage and III stage rolling, and the I stage rolling start rolling temperature is not less than 1100
DEG C, finishing temperature is 1060~1080 DEG C, and rolling pass is 3~5, and passage total reduction is 50~60%；II stage
Rolling start rolling temperature is 1020~1050 DEG C, and rolling pass is 3~5, and single pass reduction ratio is 15~25%, after rolling
Slab thickness is (h+40) mm；The III stage rolling start rolling temperature is ± 5 DEG C of (980-9h/4), and finishing temperature is (880-7h/
8) ± 5 DEG C, rolling pass is 4~6, and it is 30~35% that last three passages, which add up reduction ratio, and wherein h is the finished product as unit of mm
Thickness value；
4) section cooling: the slow cooling of 2~8s relaxation is carried out to steel plate after III stage rolling, section cooling is then carried out, opens cold temperature
Control is 400~450 DEG C in 12~18 DEG C/s, cooling red temperature in ± 5 DEG C of (760+3h/4), cooling velocity control, finally
It is air-cooled to room temperature and obtains yield strength >=620MPa welding structure fire-resistant and weather-resistant steel, wherein h is the finished product as unit of mm
Thickness value.
3. the production method of the welding structure fire-resistant and weather-resistant steel of yield strength >=620MPa according to claim 2,
It is characterized in that, upper the ratio between water and lower water are controlled 0.79~0.92 when step 4) section cooling.
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