CN109182701A - A kind of compound antidetonation fire-resistive construction steel and its manufacturing method - Google Patents

A kind of compound antidetonation fire-resistive construction steel and its manufacturing method Download PDF

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Publication number
CN109182701A
CN109182701A CN201811326139.XA CN201811326139A CN109182701A CN 109182701 A CN109182701 A CN 109182701A CN 201811326139 A CN201811326139 A CN 201811326139A CN 109182701 A CN109182701 A CN 109182701A
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steel
temperature
compound
rolling
resistive construction
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邓伟
李昭东
崔强
陈林恒
李恒坤
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Nanjing Iron and Steel Co Ltd
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Nanjing Iron and Steel Co Ltd
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    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/02Ferrous alloys, e.g. steel alloys containing silicon
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING 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
    • C21D8/00Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0221Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
    • C21D8/0226Hot rolling
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/04Ferrous alloys, e.g. steel alloys containing manganese
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/12Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/14Ferrous alloys, e.g. steel alloys containing titanium or zirconium
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D2211/00Microstructure comprising significant phases
    • C21D2211/001Austenite
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D2211/00Microstructure comprising significant phases
    • C21D2211/002Bainite
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D2211/00Microstructure comprising significant phases
    • C21D2211/005Ferrite

Abstract

The invention discloses a kind of compound antidetonation fire-resistive construction steel, its weight percent chemical component are as follows: C:0.08-0.16%, Si:0.15-0.55%, Mn:0.50-1.80%, Mo:0.10-0.50%, Nb:0.02-0.15%, V:0.00-0.12%, Ti:0.01-0.020%, remaining is Fe and inevitable impurity, and a kind of compound antidetonation fire-resistive construction steel and its manufacturing method has also been devised in the present invention;A kind of compound antidetonation fire-resistive construction steel and its manufacturing method designed by the present invention can reduce alloy use cost, have high intensity, high tenacity, antidetonation, the intelligence composite performances such as fire resisting and anti-Large Heat Input Welding.

Description

A kind of compound antidetonation fire-resistive construction steel and its manufacturing method
Technical field
The present invention relates to a kind of compound antidetonation fire-resistive construction steel and its manufacturing methods, belong to low-alloy steel manufacture neck Domain.
Background technique
High level, large span, highly-safe, economical environment-protective are the development trends of modern heavy construction, and steel construction is light-weight, applies Work is fast, space is big, Comfortable attractive, shock resistance are good, recyclable, using more in skyscraper and large-scale public place building Come more, but the fire resistance of common building steel is very poor, and with the rising of temperature, yield strength decline is very fast, especially It is to be dropped suddenly in 350 DEG C or more high temperature, does not have load-bearing capacity, it is therefore necessary to sprays very thick refractory coating and steel construction is carried out Protection, spray refractory coating make steel building cost be multiplied, and extend the duration, and the splashing of spraying operation also causes environment Pollution reduces the driving force for becoming exploitation refractory steel with or without the use of refractory coating.
Since Mo is the effective alloying element for improving elevated temperature strength, since the 1980s, Japan takes the lead in developing and push away The commercial refractory steel plates of Mo system out, the high-temperature yield strength that 600 DEG C of refractory steel must be not less than the 2/3 of room temperature standard yield intensity, Based on two kinds of Mo-Nb system and Mo-Nb-Cr system, the main high temperature, solid solution, strengthened effect strong using Mo guarantees component system 600 DEG C of elevated temperature strengths below usually add 0.5wt.%Mo and the Nb microalloying using about 0.01-0.06wt.%.
South Korea and China refractory steel also add Mo or Mo+Nb mostly, to reduce cost of alloy, Mo content under Drop, but still in 0.3wt.% or so, such as " a kind of refractory steel and preparation method thereof " (application number: 200810179362.6), " one (application number: 200910011963.0), " high strength and low cost is high for kind high-performance building structure refractory steel plates and its manufacturing method " (application number: the Mo content in 201110080774.6) etc. applying for a patent is 0.2- to tough anti-seismic refractory steel and its preparation process " 0.4wt.%, wherein " a kind of refractory steel and preparation method thereof " also added 0.05-0.12wt.%V, but the patent mainly passes through Controlling final cooling temperature is 550-650 DEG C, and keeps the temperature 1-2 hours, is formed with controlling the tissue of refractory steel, while can also promote V The room-temperature property of enhancing refractory steel is precipitated in Slow cooling or insulating process;The refractory steel cost of alloy that these patents are related to Height, only focuses on room temperature or high-temperature behavior, does not consider anti-Large Heat Input Welding performance, do not have high-strength, high-ductility, antidetonation, fire resisting, easily The composite performances features such as welding.
Summary of the invention
The technical problem to be solved by the present invention is to for the above disadvantage of the existing technology, providing one kind can drop Low-alloy use cost, the economical antidetonation for building with high intensity, high tenacity, excellent weldability and intelligent fire resistance Refractory steel and its manufacturing method.
The technical solution that the present invention solves the above technical problem is: a kind of compound antidetonation fire-resistive construction steel, weight Percentage chemical component are as follows: C:0.08-0.16%, Si:0.15-0.55%, Mn:0.50-1.80%, Mo:0.10-0.50%, Nb: 0.02-0.15%, V:0.00-0.12%, Ti:0.01-0.020%, remaining is Fe and inevitable impurity.
Carbon: the anti-seismic refractory steel in the present invention is designed using low-carbon ingredient, and carbon content range is 0.08-0.16%, is effectively solved The higher impact flexibility to steel of carbon content of having determined especially upper mounting plate ballistic work is unfavorable, obvious damage welding performance this technology is asked Topic;
Silicon: the silicone content range of steel of the present invention is 0.15-0.55%, promotion of the components utilising Si to intensity, and effectively preventing Deterioration of the Si of amount for the toughness and welding performance of steel;
Manganese: steel Mn content range of the present invention are as follows: 0.50-1.80% not only expands microalloy carbonitride in austenite Solubility product avoids excessive microalloy carbonitride deformation-induced precipitation during the rolling process, while preventing in slab Segregation tendency increase and it is unfavorable caused by welding performance;
Molybdenum: the content of Mo accurately controls in the present invention, range 0.10-0.50%, the harden ability in addition to significantly improving steel, inhibits P, the impurity elements such as S crystal boundary segregation and reduce outside temper brittleness, in refractory steel mainly play it is high temperature, solid solution, strengthened and Precipitation strength effect;When Mo content is lower than 0.10%, above-mentioned function and effect are unobvious, and fire resistance is bad, when more than 0.50wt.%, Higher cost;
Niobium: Nb content should control the Nb being solid-solution in austenite in 0.02-0.15%, the operation of rolling in the present invention and deformation lures It leads precipitation niobium carbonitride particles and significantly improves austenite non-recrystallization temperature, obtain pancake austenite, help to refine iron element Body and bainite structure, the Nb being solid-solution in austenite can also improve harden ability, the Nb being solid-solution in ferrite and bainite Also there is remarkable effect to elevated temperature strength is improved;
Vanadium: the content of V is no more than 0.12% in the present invention, and since V has lower full solid solubility temperature, when soaking is substantially all solid Molten, the V being dissolved in the operation of rolling can effectively improve harden ability and improve recrystallization temperature, intelligently analyse with the kindling similar with Nb It acts on out, the formation element as MC phase assists addition;
Titanium: it is the TiN particle and TiO in order to form nano-grade size that a small amount of Ti is added in steel of the present inventionxParticle can refine casting Austenite grain in base heating process, and heat affected area grain coarsening is prevented in the welding process, improve anti-Large Heat Input Welding Performance.Ti content controls within the scope of 0.01-0.020%, is lower than 0.01% formed TiN and TiOxNegligible amounts refine crystal grain Very little is acted on, weld heat input is low;The liquation TiN that micron order size will be formed higher than 0.020%, it is brilliant cannot not only to play refinement Grain effect, weld heat input is low, and harmful to steel plate toughness;
Nb content of the present invention should be controlled in 0.02-0.15%, and be passed through under faster cooling rate cooperation after hot rolling, the precipitation quilt of Nb Inhibit, so that yield strength is not too high, it is advantageous to lower yield tensile ratio at room temperature, but undecomposed Nb will return red process In can be individually precipitated from ferrite and bainite, or with the compound precipitation of V, Mo, formed nano-second-phase, make up steel at high temperature Strength reduction caused by due to matrix softening, improves fire resistance;
Mo content control of the invention is 0.10-0.50%, and cooperates rolling mill practice of the invention, can expand microalloy carbon nitrogen Solubility product of the compound in austenite avoids excessive microalloy carbonitride deformation-induced precipitation during the rolling process;Separately Outside, the present invention passes through the cooperation of Mo and V, Nb, Ti microalloy element, can be with V, Nb, Ti microalloy member during heating fire The compound precipitation of element, can be improved the thermal stability of precipitate while increasing amount of precipitation, improve and guarantee steel in height to stablize Fire resistance when warm.
The present invention further limits scheme:
Its weight percent chemical component above-mentioned are as follows: C:0.08%, Si:0.37%, Mn:1.35%, Mo:0.30%, Nb: 0.025%, V:0.010%, Ti:0.018%, remaining is Fe and inevitable impurity.
Its weight percent chemical component above-mentioned are as follows: C:0.16%, Si:0.15%, Mn:1.75%, Mo:0.10%, Nb: 0.08%, V:0.04%, Ti:0.010%, remaining is Fe and inevitable impurity.
Its weight percent chemical component above-mentioned are as follows: C:0.12%, Si:0.55%, Mn:0.50%, Mo:0.45%, Nb: 0.13%, V:0.001%, Ti:0.015%, remaining is Fe and inevitable impurity.
The present invention also provides a kind of manufacturing methods of compound antidetonation fire-resistive construction steel, specifically includes the following steps:
S1: smelting molten steel: smelting molten steel is carried out by the target chemical ingredient of the steel plate, when tapping, silicomanganese was first added into ladle Alloying is carried out, and accurately controls alloy order of addition during LF refining, successively adds Ti, Mo, Nb and V, adjusts molten steel Ingredient is to target component;
S2: continuous casting: the molten steel of smelting is cast into continuous casting billet, thickness of strand >=100mm guarantees to be not less than 3 times of compression ratios;
S3: slab reheats: continuous casting billet is heated to 1100~1250 DEG C, 8~12min/cm of time inside furnace;
S4: hot rolling: using two-phase control rolling technique, specifically:
(1) roughing rolls: roughing rolls 3-5 passage, and roughing finishing temperature is 1020-1150 DEG C, so that by repeatedly inside steel Recrystallization softening austenite;
(2) finish rolling rolls: finish rolling rolls 5-10 passage, 880-980 DEG C of finish rolling start rolling temperature, and finishing temperature is 830-920 DEG C, rolls Pancake austenite tissue is obtained afterwards;Through section cooling after rolling, 5-15 DEG C of cooling rate/s is suppressed the precipitation of Nb, eventually it is cold return it is red 500-700 DEG C of temperature, undecomposed Nb return it is red during be individually precipitated from ferrite and bainite, or with the compound analysis of V, Mo Out, nano-second-phase is formed, and obtains fine ferrite grain and granular bainite microstructure, is then air-cooled to room temperature.
The beneficial effects of the present invention are:
(1) present invention passes through smelting using appropriate Nb, low Mo, low V, micro- Ti multi-element composite micro-alloying and the design of low-carbon ingredient Process Oxide Metallurgy technique obtains advantageous field trash, improves anti-Large Heat Input Welding performance;By controlling heating period temperature Degree has fine ferrite grain/grain using two stages controlled rolling process, control laminar flow cooling velocity, control final cooling temperature technique production The anti-seismic refractory steel of shape bainite structure or granular bainite microstructure, fine ferrite grain/granular bainite microstructure or granular bayesian Body tissue ensure that high room temperature intensity and low yield strength ratio, fine grained texture and the second phase of a large amount of microalloys intelligence in ignition process It is precipitated, guarantees elevated temperature strength, there is shock resistance and intelligent fire resistance;Low carbon content and carbon equivalent design, are added a small amount of Nb, V reduce more Mo, reduce cost of alloy, obtain fine grained texture by controlled rolling and controlled cooling, have high-intensitive, high tenacity and Excellent weldability
(2) present invention accurately controls alloy order of addition during LF refining, successively adds Ti, Mo, Nb and V, adjusts molten steel Ingredient is to target component;Purpose is to control type, size and the quantity of steel inclusion, is obtained having a size of 0.2~5 μm containing Ti The amount of inclusions of oxide is 1800~2200/mm2;The amount of inclusions of the nitride containing Ti having a size of 10~300nm Greater than 4 × 106A/mm2;During Large Heat Input Welding, these field trashes are conducive to pinning austenite grain and refine transgranular Tissue improves Low Temperature Impact Toughness of Heat-affected Zone;
(2) steel plate tissue signature produced by the present invention are as follows: ferrite+granular bainite;At the austenite grain boundary of welding heat affected zone It is dispersed with pro-eutectoid ferrite, average grain size is less than 50 μm, and occupied area score is less than 40%, inside original austenite grain For fine acicular ferrite, occupied area score is greater than 60%;
(3) when steel plate room temperature produced by the present invention the microalloy elements such as Nb, V solid solution in the base, have high intensity, high tenacity, The performance characteristic of low yield strength ratio, in high temperature ignition process, the nano combined precipitate of Mo, Nb, V are intelligently precipitated, and compensation matrix is strong The loss of degree guarantees high-temperature flame-proof performance;
(4) in conclusion the present invention is by control manufacturing condition, a large amount of small and disperseds distribution of generation is aoxidized containing Ti The complex inclusion of object, nitride, steel plate, close to 1400 DEG C of high temperature positions of melt run, are formed big when high heat-input is welded The intragranular acicular ferrite of amount, while in separate melt run site tissue of the temperature lower than 1400 DEG C, pinning original austenite is brilliant Grain simultaneously refines intergranular structure.The coefficient resultant effect of the two increases substantially the toughness of welding heat affected zone, has steel There is good welding performance, it can anti-Large Heat Input Welding;
(5) in summary effect, steel plate room temperature tensile yield strength ReL: >=345MPa, tensile strength Rm: >=490MPa, Qu Qiang Than YR :≤0.80, elongation after fracture A: >=22%, -40 DEG C of Charpy-V impact power KV2: >=150J;600 DEG C of high-temperature flame-proof coefficient I [(room temperature yield strength-high-temperature yield strength)/room temperature yield strength] meets: I >=0.33;It is defeated through the big heat of 50~200kJ/cm After entering welding, -40 DEG C of welding point heat affected area ballistic work average value is greater than 50J.
Specific embodiment
Embodiment 1
The present embodiment provides a kind of compound antidetonation fire-resistive construction steel, weight percent chemical component are as follows: C:0.08%, Si: 0.37%, Mn:1.35%, Mo:0.30%, Nb:0.025%, V:0.010%, Ti:0.018%, remaining for Fe and inevitably it is miscellaneous Matter.
The present embodiment also provides a kind of manufacturing method of compound antidetonation fire-resistive construction steel, and three groups of each setting is different respectively Technological parameter prepared, specifically:
S1: smelting molten steel: smelting molten steel is carried out by the target chemical ingredient of the steel plate, when tapping, silicomanganese was first added into ladle Alloying is carried out, and accurately controls alloy order of addition during LF refining, successively adds Ti, Mo, Nb and V, adjusts molten steel Ingredient is to target component;
S2: continuous casting: being cast into 3 pieces of identical continuous casting billet A1, A2 and A3 for the molten steel of smelting, and the thickness of continuous casting billet is all 220mm, And compression ratio all guarantees 4 times;
S3: slab reheat: by A1, A2 and A3, this 3 blocks of continuous casting billets are respectively heated, temperature be separately heated to 1220 DEG C, 1150 DEG C and 1250 DEG C, time inside furnace is all 8min/cm;Austenitizing temperature is controlled, it is complete solid higher than microalloy element Nb, V Solubility temperature, but the temperature that unusual crystal grain is grown up occurs lower than TiN back dissolving and austenite, make full use of solid analysis TiN to prevent austenite The effect that crystal grain is grown up obtains the prior austenite body tissue of fine uniform;
S4: A1, A2 and A3: being used two-phase control rolling technique by hot rolling, specifically:
(1) roughing rolls: A1, A2 and A3 roughing rolling are all 3 passages, so that passing through recrystallization softening Ovshinsky repeatedly inside steel Body, and A1, A2 and A3 roughing finishing temperature are respectively 1055 DEG C, 1038 DEG C and 1100 DEG C;
(2) finish rolling rolls: A1, A2 and A3 finish rolling roll 5 passages, wherein A1, A2 and A3 finish rolling start rolling temperature be respectively 950 DEG C, 920 DEG C and 980 DEG C, corresponding finishing temperature is respectively 913 DEG C, 840 DEG C and 920 DEG C, and pancake austenite tissue is obtained after rolling; Rear A1, A2 and A3 are rolled through section cooling, and cooling rate is respectively 15 DEG C/s, 10 DEG C/s and 5 DEG C/s, is suppressed the precipitation of Nb, A1, A2 Red temperature with A3 is respectively 500 DEG C, 510 DEG C and 670 DEG C, undecomposed Nb return it is red during from ferrite and bainite In be individually precipitated, or with the compound precipitation of V, Mo, form nano-second-phase, and obtain fine ferrite grain and granular bainite microstructure, Then it is air-cooled to room temperature.
Embodiment 2
The present embodiment provides a kind of compound antidetonation fire-resistive construction steel, weight percent chemical component are as follows: C:0.16%, Si: 0.15%, Mn:1.75%, Mo:0.10%, Nb:0.08%, V:0.04%, Ti:0.010%, remaining is Fe and inevitable impurity.
The present embodiment also provides a kind of manufacturing method of compound antidetonation fire-resistive construction steel, and three groups of each setting is different respectively Technological parameter prepared, specifically:
S1: smelting molten steel: smelting molten steel is carried out by the target chemical ingredient of the steel plate, when tapping, silicomanganese was first added into ladle Alloying is carried out, and accurately controls alloy order of addition during LF refining, successively adds Ti, Mo, Nb and V, adjusts molten steel Ingredient is to target component;
S2: continuous casting: being cast into 3 pieces of identical continuous casting billet B1, B2 and B3 for the molten steel of smelting, and the thickness of continuous casting billet is all 150mm, And compression ratio all guarantees 5 times;
S3: slab reheat: by B1, B2 and B3, this 3 blocks of continuous casting billets are respectively heated, temperature be separately heated to 1180 DEG C, 1200 DEG C and 1280 DEG C, time inside furnace is all 10min/cm;Austenitizing temperature is controlled, it is complete solid higher than microalloy element Nb, V Solubility temperature, but the temperature that unusual crystal grain is grown up occurs lower than TiN back dissolving and austenite, make full use of solid analysis TiN to prevent austenite The effect that crystal grain is grown up obtains the prior austenite body tissue of fine uniform;
S4: B1, B2 and B3: being used two-phase control rolling technique by hot rolling, specifically:
(1) roughing rolls: B1, B2 and B3 roughing rolling are all 4 passages, so that passing through recrystallization softening Ovshinsky repeatedly inside steel Body, and B1, B2 and B3 roughing finishing temperature are respectively 1045 DEG C, 1060 DEG C and 1150 DEG C;
(2) finish rolling rolls: B1, B2 and B3 finish rolling roll 8 passages, wherein B1, B2 and B3 finish rolling start rolling temperature be respectively 890 DEG C, 880 DEG C and 940 DEG C, corresponding finishing temperature is respectively 830 DEG C, 856 DEG C and 885 DEG C, and pancake austenite tissue is obtained after rolling; Rear B1, B2 and B3 are rolled through section cooling, and cooling rate is respectively 14 DEG C/s, 5 DEG C/s and 8 DEG C/s, is suppressed the precipitation of Nb, B1, B2 Red temperature with B3 is respectively 580 DEG C, 660 DEG C and 540 DEG C, undecomposed Nb return it is red during from ferrite and bainite In be individually precipitated, or with the compound precipitation of V, Mo, form nano-second-phase, and obtain fine ferrite grain and granular bainite microstructure, Then it is air-cooled to room temperature.
Embodiment 3
The present embodiment provides a kind of compound antidetonation fire-resistive construction steel, weight percent chemical component are as follows: C:0.12%, Si: 0.55%, Mn:0.50%, Mo:0.45%, Nb:0.13%, V:0.001%, Ti:0.015%, remaining is Fe and inevitable impurity.
The present embodiment also provides a kind of manufacturing method of compound antidetonation fire-resistive construction steel, and three groups of each setting is different respectively Technological parameter prepared, specifically:
S1: smelting molten steel: smelting molten steel is carried out by the target chemical ingredient of the steel plate, when tapping, silicomanganese was first added into ladle Alloying is carried out, and accurately controls alloy order of addition during LF refining, successively adds Ti, Mo, Nb and V, adjusts molten steel Ingredient is to target component;
S2: continuous casting: being cast into 3 pieces of identical continuous casting billet C1, C2 and C3 for the molten steel of smelting, and the thickness of continuous casting billet is all 260mm, And compression ratio all guarantees 6 times;
S3: slab reheat: by C1, C2 and C3, this 3 blocks of continuous casting billets are respectively heated, temperature be separately heated to 1200 DEG C, 1210 DEG C and 1100 DEG C, time inside furnace is all 12min/cm;Austenitizing temperature is controlled, it is complete solid higher than microalloy element Nb, V Solubility temperature, but the temperature that unusual crystal grain is grown up occurs lower than TiN back dissolving and austenite, make full use of solid analysis TiN to prevent austenite The effect that crystal grain is grown up obtains the prior austenite body tissue of fine uniform;
S4: C1, C2 and C3: being used two-phase control rolling technique by hot rolling, specifically:
(1) roughing rolls: C1, C2 and C3 roughing rolling are all 5 passages, so that passing through recrystallization softening Ovshinsky repeatedly inside steel Body, and C1, C2 and C3 roughing finishing temperature are respectively 1062 DEG C, 1050 DEG C and 1020 DEG C;
(2) finish rolling rolls: C1, C2 and C3 finish rolling roll 10 passages, wherein C1, C2 and C3 finish rolling start rolling temperature be respectively 910 DEG C, 940 DEG C and 910 DEG C, corresponding finishing temperature is respectively 841 DEG C, 906 DEG C and 868 DEG C, and pancake austenite tissue is obtained after rolling; Rear C1, C2 and C3 are rolled through section cooling, and cooling rate is respectively 7 DEG C/s, 10 DEG C/s and 13 DEG C/s, is suppressed the precipitation of Nb, C1, C2 Red temperature with C3 is respectively 700 DEG C, 570 DEG C and 590 DEG C, undecomposed Nb return it is red during from ferrite and bainite In be individually precipitated, or with the compound precipitation of V, Mo, form nano-second-phase, and obtain fine ferrite grain and granular bainite microstructure, Then it is air-cooled to room temperature.
Above-described embodiment 1-3 has manufactured 9 blocks of compound antidetonation fire-resistive construction steel altogether, this 9 pieces compound antidetonation fire resistings are built It builds as shown in table 1 below with steel transverse tensile property, -40 DEG C of impact of collision function;
The mechanical property of the compound antidetonation fire-resistive construction steel of table 1
In addition to the implementation, the present invention can also have other embodiments.It is all using equivalent substitution or equivalent transformation formed Technical solution is fallen within the scope of protection required by the present invention.

Claims (5)

1. a kind of compound antidetonation fire-resistive construction steel, a kind of compound antidetonation fire-resistive construction steel, which is characterized in that its weight Percentage chemical component are as follows: C:0.08-0.16%, Si:0.15-0.55%, Mn:0.50-1.80%, Mo:0.10-0.50%, Nb: 0.02-0.15%, V:0.00-0.12%, Ti:0.008-0.020%, remaining is Fe and inevitable impurity.
2. compound antidetonation fire-resistive construction steel as described in claim 1, it is characterised in that: its weight percent chemical component Are as follows: C:0.08%, Si:0.37%, Mn:1.35%, Mo:0.30%, Nb:0.025%, V:0.010%, Ti:0.018%, remaining for Fe and Inevitable impurity.
3. compound antidetonation fire-resistive construction steel as described in claim 1, it is characterised in that: its weight percent chemical component Are as follows: C:0.16%, Si:0.15%, Mn:1.75%, Mo:0.10%, Nb:0.08%, V:0.04%, Ti:0.010%, remaining is for Fe and not Evitable impurity.
4. compound antidetonation fire-resistive construction steel according to claim 1, which is characterized in that its weight percent chemistry at Be divided into: C:0.12%, Si:0.55%, Mn:0.50%, Mo:0.45%, Nb:0.13%, V:0.001%, Ti:0.015%, remaining is Fe With inevitable impurity.
5. the manufacturing method of the compound antidetonation fire-resistive construction steel as described in claim 1-3 is any, it is characterised in that: specific The following steps are included:
S1: smelting molten steel: smelting molten steel is carried out by the target chemical ingredient of the steel plate, when tapping, silicomanganese was first added into ladle Alloying is carried out, and accurately controls alloy order of addition during LF refining, successively adds Ti, Mo, Nb and V, adjusts molten steel Ingredient is to target component;
S2: continuous casting: the molten steel of smelting is cast into continuous casting billet, thickness of strand >=100mm guarantees to be not less than 3 times of compression ratios;
S3: slab reheats: continuous casting billet is heated to 1100~1250 DEG C, 8~12min/cm of time inside furnace;
S4: hot rolling: using two-phase control rolling technique, specifically:
(1) roughing rolls: roughing rolls 3-5 passage, and roughing finishing temperature is 1020-1150 DEG C, so that by repeatedly inside steel Recrystallization softening austenite;
(2) finish rolling rolls: finish rolling rolls 5-10 passage, 880-980 DEG C of finish rolling start rolling temperature, and finishing temperature is 830-920 DEG C, rolls Pancake austenite tissue is obtained afterwards;Through section cooling after rolling, 5-15 DEG C of cooling rate/s is suppressed the precipitation of Nb, eventually it is cold return it is red 500-700 DEG C of temperature, undecomposed Nb return it is red during be individually precipitated from ferrite and bainite, or with the compound analysis of V, Mo Out, nano-second-phase is formed, and obtains fine ferrite grain and granular bainite microstructure, is then air-cooled to room temperature.
CN201811326139.XA 2018-11-08 2018-11-08 A kind of compound antidetonation fire-resistive construction steel and its manufacturing method Pending CN109182701A (en)

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Application publication date: 20190111