CN109161812A - 500MPa grades contain V, Nb microalloy high yield ratio anti-seismic steel bar wire rod and its production method - Google Patents
500MPa grades contain V, Nb microalloy high yield ratio anti-seismic steel bar wire rod and its production method Download PDFInfo
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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
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/0006—Adding metallic additives
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/0056—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00 using cored wires
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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
- C21D8/06—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires
- C21D8/065—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires of ferrous alloys
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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
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
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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
- C22C38/002—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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- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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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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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/005—Ferrite
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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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/009—Pearlite
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Abstract
The invention belongs to Ferrous Metallurgys and steel rolling field, and in particular to 500MPa grades contain V, Nb microalloy high yield ratio anti-seismic steel bar wire rod and its production method.Present invention solves the technical problem that being existing 500MPa grades lower containing vanadium, nitrogen alloy anti-seismic steel bar strong flexor ratio.Constituent of the present invention containing V, Nb anti-seismic steel bar wire rod is C:0.20%~0.25%, Si:0.35%~0.65%, Mn:1.20%~1.60%, V:0.040%~0.080%, Nb:0.010%~0.030%, N:0.0250%~0.0350%.FeV is added in tapping process and controls V content, the content of feeding Nb and N containing the adjustment of Nb, N core-spun yarn in LF furnace refining process, while cooperating subsequent rolling mill practice.The lower yield strength surplus capacity of wire roll provided by the invention is larger, and strong flexor ratio reaches 1.40 or more, and anti-seismic performance is excellent.
Description
Technical field
The invention belongs to Ferrous Metallurgys and steel rolling field, and in particular to a kind of 500MPa grades of high yield ratio containing V, Nb microalloy
Anti-seismic steel bar wire rod and its production method.
Background technique
Micro alloyed steel is primarily referred to as adding minimal amount or micro certain or certain several element in steel and can significantly improve
The steel of performance especially improves the intensity index of steel.Micro alloyed steel mainly passes through addition minimal amount or micro- under the conditions of the prior art
Vanadium, niobium and titanium are measured to prepare.The mechanism of action of microalloying is: after molten steel is added in vanadium, niobium and titanium as microelement, with steel
Carbon and nitrogen in liquid combine, and form carbon, nitrogen compound particle, i.e. V (C, N), Nb (C, N) and Ti (C, N) particle, these particles
Have the function of certain precipitation strength and crystal grain refinement, can significantly improve the intensity of steel.It can be seen that actually microalloy
The effect of steel vanadium, niobium and titanium is inseparable with nitrogen.Converter smelting steel is used under normal circumstances, and residual nitrogen content exists
In 0.0030%~0.0065% range, using electric furnace smelting steel, residual nitrogen content is in 0.0050%~0.0085% range.
The invigoration effect that such as give full play to vanadium, niobium and titanium, has to nitrogen additionally is added and is just able to achieve.
Since the disasters such as China's earthquake take place frequently, after especially 5.12 Wenchuan earthquakes, the anti-seismic performance of building trade reinforcing bar
Index obtains extensive concern, and high-intensitive, high yield ratio anti-seismic steel bar will be increasingly becoming mainstream.Currently, microalloying reinforcing bar
Mainstream measure is addition VN alloy.Patent document CN101693978A discloses 500MPa grades of large-size hot-rolled ribbed rebar
With steel and its smelting process, chemical component weight percentage are as follows: C0.17%-0.25%, Si0.40%-0.80%,
Mn1.40%-1.60%, P≤0.045%, S≤0.045%, V0.06%-0.10%, N0.012%-0.033%, and V/N ratio
3.0-5.0, remaining is Fe and impurity element, and VN alloy is added in tapping process and closes nitrogen promoter, wherein being added to a large amount of N member
Element, although having played the strengthening effect of vanadium, strong flexor ratio≤1.30 of the 500MPa reinforcing bar of production, being unable to reach both be can guarantee
The intensity index of reinforcing bar higher yield strength, and can have the anti-seismic performance index compared with high yield ratio.
Summary of the invention
Present invention solves the technical problem that be that 500MPa grades of microalloyed reinforcing steel bar antidetonations can be bad, can not both can guarantee reinforcing bar compared with
The intensity index of high-yield strength, and can have the anti-seismic performance index compared with high yield ratio.
The present invention provides the 500MPa grades of anti-seismic steel bar wire rods containing V, Nb microalloy high yield ratio, chemical component are as follows: by weight
Percentages, C:0.20%~0.25%, Si:0.35%~0.65%, Mn:1.20%~1.60%, P≤0.035%, S≤
0.035%, V:0.040%~0.080%, Nb:0.010%~0.030%, N:0.0250%~0.0350%, remaining is Fe
With inevitable impurity.
The present invention also provides the 500MPa grades of production methods containing V, Nb microalloy high yield ratio anti-seismic steel bar wire rod, including according to
The following steps of secondary progress: electric furnace or converter smelting, LF refining, continuous small-billet casting, heating steel billet, high-speed rod-rolling mill are rolled
Material is made, pole wire rod or screw wire rod is made in cooling.In electric furnace or converter smelting tapping process, VN16, FeV adjustment is added
The content of N and V, the wire rod chemical composition comprises the following components in percentage by weight, C:0.20%~0.25%, Si:0.35%~0.65%,
Mn:1.20%~1.60%, P≤0.035%, S≤0.035%, V:0.040%~0.080%, Nb:0.010%~
0.030%, N:0.0250%~0.0350%, remaining is Fe and inevitable impurity.
Wherein, it in electric furnace or converter smelting tapping process, smelts into molten steel C content and is lower than 0.06%, P, S content are low
Be added FeSi, FeMn, FeV into molten steel in 0.035% tapping, when tapping is carried out to 1/3~2/3 and anthracite carry out Si, Mn,
V and C element alloying, control molten steel V content are 0.040%~0.080%.
Wherein, the core-spun yarn containing Nb, N is fed in LF furnace refining process, adjustment molten steel Nb content is 0.010%~0.030%,
N content is 0.0250%~0.0350%.
Wherein, in heating steel billet and the operation of rolling, 960 DEG C~1230 DEG C of billet heating temperature, 1010 DEG C of soaking temperature~
It 1210 DEG C, heats and soaking total time 100min~150min；It is 900 DEG C~970 DEG C that high-speed wire rolling, which controls laying temperature,.
Wherein, roller repairing is cooled to 600 DEG C~700 DEG C first with 4 DEG C/s~8 DEG C/s cooling velocity, then with 2
DEG C/s~3 DEG C/s cooling velocity is cooled to 400 DEG C~500 DEG C, it is finally cooling with 0.5 DEG C/s~1.0 DEG C/s cooling velocity
To 150 DEG C~300 DEG C.
Comparison same as the prior art, the invention has the following advantages:
1, there is high intensity simultaneously containing V, Nb microalloy high yield ratio anti-seismic steel bar wire rod for 500MPa grades provided by the invention
And the characteristics of high anti-seismic, chemical component are as follows: by weight percentage, C:0.20%~0.25%, Si:0.35%~0.65%,
Mn:1.20%~1.60%, P≤0.035%, S≤0.035%, V:0.040%~0.080%, Nb:0.010%~
0.030%, N:0.0250%~0.0350%, remaining is Fe and inevitable impurity, lower yield strength >=540MPa, tension
Intensity >=760MPa, elongation after fracture >=20%, maximum, force breaking elongation >=12%, strong flexor ratio >=1.40, microscopic structure are iron
Ferritic and pearlite, specification include
2, FeV alloy is added in electric furnace or converter tapping process and carries out vanadium alloying by the present invention, in LF furnace refining process
Feed containing Nb, N core-spun yarn adjustment Nb and N to suitable level, be stably controlled molten steel N content for 0.0250%~
0.0350%, V content is that 0.040%~0.080%, Nb content is 0.010%~0.030%, and niobium, nitrogen recovery rate are high and steady
It is fixed, while cooperating subsequent rolling mill practice, the wire rod yield strength surplus capacity produced is big, realizes yield strength and bends by force
Ratio is taken into account, so that 500MPa wire roll has the characteristics that high-intensitive and high anti-seismic simultaneously.
3, the 500MPa grades provided by the invention anti-seismic steel bar wire rod V content containing V, Nb microalloy high yield ratio is lower, passes through
The content of cheap element N is improved, while suitable Nb is added, obtains high-intensitive and high yield ratio wire rod, lower production costs.
Specific embodiment
The present invention provides the 500MPa grades of anti-seismic steel bar wire rods containing V, Nb microalloy high yield ratio, chemical component are as follows: by weight
Percentages, C:0.20%~0.25%, Si:0.35%~0.65%, Mn:1.20%~1.60%, P≤0.035%, S≤
0.035%, V:0.040%~0.080%, Nb:0.010%~0.030%, N:0.0250%~0.0350%, remaining is Fe
With inevitable impurity.
The present invention provides the 500MPa grades of anti-seismic steel bar wire rods containing V, Nb microalloy high yield ratio, and specification includes Lower yield strength >=540MPa, tensile strength >=760MPa, elongation after fracture >=20%, maximum, force breaking elongation >=
12%, strong flexor ratio >=1.40, microscopic structure is ferrite and pearlite.
N is a kind of elemental gas, is cooperated with the V micro alloying element in steel, and the analysis of V micro alloying element can be strongly facilitated
V (C, N) particle out enhances the precipitation strength and refined crystalline strengthening effect of V, significantly improves the intensity of steel, but improving hardness of steel
The strong flexor ratio index of steel can be significantly reduced simultaneously.Meanwhile to belong to elemental gas, control relatively unstable by N, adds and very few is difficult to protect
The precipitation strength effect of vanadium is demonstrate,proved, addition excessively can then significantly reduce the strong flexor ratio of reinforcing bar, anti-seismic performance is caused to be remarkably decreased.
Nb is a kind of micro alloying element, and Nb (C, N) particle can be precipitated, and has stronger precipitation strength and refined crystalline strengthening
Effect is remarkably improved the tensile strength of steel, improves the strong flexor ratio index of steel, but to will lead to slab crackle tendency tight by excessive Nb
Weight and stocking tendency generate bainite structure.
To guarantee that the synthesis of reinforcing bar high-yield strength and high yield ratio anti-seismic performance is taken into account, the present invention utilizes higher N member
Cellulose content guarantees that the precipitation effect of V element gives full play to, while usually being made up using Nb member and to add excessive N element and bring
Steel strong flexor ratio loss, by many experiments, the present invention control molten steel Nb content be 0.010%~0.030%, N content is
0.0250%~0.0350%, V:0.040%~0.080%.
C is intensified element most basic in steel, and C content is every in reinforcing bar increases by 0.01%, and the yield strength of reinforcing bar about increases
Add 10MPa, tensile strength about increases 14Mpa, and excessively high C can reduce the moulding and solderability of reinforcing bar, the control of C content in the present invention
Range processed is selected as 0.20%~0.25%.
Si is important deoxidier, helps to reduce the oxygen content in steel, reduces field trash, while Si is that ferrite is strengthened
Element can improve ferritic intensity by solution strengthening, to guarantee the good strong flexor ratio index of reinforcing bar, Si in the present invention
The range of content is selected as 0.35%~0.65%.
Mn is good deoxidier and desulfurizing agent, mainly plays solution strengthening effect in steel grade, is important Strengthening and Toughening element,
The effect that Mn improves steel tensile strength is obvious compared with the effect for improving yield strength, to guarantee the good strong flexor ratio index of reinforcing bar,
The range of Mn content is selected as 1.20%~1.60% in the present invention.
P and S is objectionable impurities elements in steelmaking process, easily forms harmful field trash in steel grade, reduce the toughness of steel with
Moulding, and P increases the brittleness of steel, the range of P and S content is selected as≤0.035% in the present invention easily in grain boundaries segregation.
The present invention also provides the 500MPa grades of production methods containing V, Nb microalloy high yield ratio anti-seismic steel bar wire rod, including according to
The following steps of secondary progress: electric furnace or converter smelting, LF refining, continuous small-billet casting, heating steel billet, continous way wire rod Rolling Production
Line rolling, cold bed are cooling.In electric furnace or converter smelting tapping process, the content of FeV adjustment V is added, in LF furnace refining process
The content of feeding Nb and N containing the adjustment of Nb, N core-spun yarn, the wire rod chemical composition comprises the following components in percentage by weight, C:0.20%~
0.25%, Si:0.35%~0.65%, Mn:1.20%~1.60%, P≤0.035%, S≤0.035%, V:0.070%~
0.170%, N:0.0100%~0.0120%, remaining is Fe and inevitable impurity.
The vanadium that 500MPa grades of vanadium micro-alloying anti-seismic steel bars usually require to add more content is just able to satisfy intensity and wants
Ask, due under normal circumstances molten steel addition vanadium in vanadium nitrogen alloy and nitrogen ratio be it is fixed, mainly have VN12, VN14 and
Tri- trades mark of VN16, in the case where meeting intensity requirement, with increasing for vanadium, nitrogen element content also increases, general meeting
Reach between 0.0120%~0.0300%, the strong flexor ratio of reinforcing bar is relatively low and unstable at this time.In addition, although VN alloy both contains
Vanadium and nitrogen content and height, but for micro-alloying technology route different in micro alloyed steel, especially composite micro-alloyed steel, example
It, can not meet demand such as V-Nb-N, even V-Nb-Ti-N.Therefore, the present invention selects the mode that FeV is added to control V's
Then content feeds the content of the Nb and N containing the adjustment of Nb, N core-spun yarn in LF furnace refining process.
Wherein, it in electric furnace or converter smelting tapping process, smelts into molten steel C content and is lower than 0.06%, P, S content are low
Be added FeSi, FeMn, FeV into molten steel in 0.035% tapping, when tapping is carried out to 1/3~2/3 and anthracite carry out Si, Mn,
V and C element alloying, control molten steel V content are 0.040%~0.080%.
Wherein, the core-spun yarn containing Nb, N is fed in LF furnace refining process, adjustment molten steel Nb content is 0.010%~0.030%,
N content is 0.0250%~0.0350%.
FeV is added during steel to adjust V 0.040%~0.080%, then feeds and contains in LF furnace refining process
Nb, N core-spun yarn come precise and stable adjustment Nb, N content in optimal level.By control nitrogen content 0.0250%~
0.0350%, it acts on the precipitation strength of V and is given full play to, yield strength is substantially improved, and can save the additive amount of vanadium, simultaneously
It is usually made up using Nb member and adds excessive N element bring steel strong flexor ratio loss, reinforcing bar is made to have both high-intensitive and high anti-seismic
The characteristics of.In addition, the alloying of V, Nb, N element cannot be carried out simultaneously, because feeding core-spun yarn needs molten steel slugging or molten steel to have
Standby relatively thin slag blanket, facilitates core-spun yarn to feed in molten steel completely, just can guarantee that Nb, N have relatively high and stable recovery rate in this way.
Wherein, in heating steel billet and the operation of rolling, 960 DEG C~1230 DEG C of billet heating temperature, 1010 DEG C of soaking temperature~
It 1210 DEG C, heats and soaking total time 100min~150min；It is 900 DEG C~970 DEG C that high-speed wire rolling, which controls laying temperature,.
Wherein, roller repairing is cooled to 600 DEG C~700 DEG C first with 4 DEG C/s~8 DEG C/s cooling velocity, then with 2
DEG C/s~3 DEG C/s cooling velocity is cooled to 400 DEG C~500 DEG C, it is finally cooling with 0.5 DEG C/s~1.0 DEG C/s cooling velocity
To 150 DEG C~300 DEG C.
Technical solution of the present invention is further elaborated below in conjunction with several embodiments, but these embodiments are absolutely not to this
Invention has any restrictions.Those skilled in the art change to any done in present invention implementation under the enlightenment of this specification
It will fall within the scope of the appended claims.
Embodiment 1
The reinforcing bar of the present embodiment, each component is as shown in table 1, preparation method are as follows:
By molten iron pre-desulfurization, top and bottom complex blowing smelting is carried out after 120 tons of converters of nominal capacity are added in molten iron, steel scrap etc.,
Smelt into molten steel C content lower than 0.06%, P, S content lower than 0.035% tapping, tapping carry out to during 1/3~2/3 to
FeSi, FeMn, FeV alloy are added in molten steel and anthracite carries out Si, Mn, V and C element alloying, control molten steel V content is
0.040%；After molten steel arrival furnace after chain-wales, steel ladle immediately accesses pipeline, and the molten steel into ladle is blown into nitrogen, is blown into nitrogen
Gas 4min melt all kinds of alloys being added sufficiently and uniform；Steel ladle is electrically heated after reaching LF furnace, LF furnace refining after
The core-spun yarn containing Nb, N is fed in ladle, controlling Nb content in molten steel is 0.010%, and controlling N content in molten steel is 0.0250%, at
Conticaster is sent to cast after point trim process；It is used when being cast into 160mm × 160mm slab on 6 machines 6 stream billet caster
Protective casting, casting blank stacking cooled to room temperature；It is sent after slab cooling to high-speed rod-rolling mill production line, in heating stove heating
1220 DEG C of temperature, 1210 DEG C of soaking temperature, heating and soaking total time 100min, rolled through high-speed rod-rolling mill, laying temperature
965 DEG C, 600 DEG C are cooled to the cooling velocity of 4 DEG C/s first, is then cooled to 400 DEG C with the cooling velocity of 2 DEG C/s, finally
The collection collection volume of steel is carried out after being cooled to 150 DEG C with the cooling velocity of 1.0 DEG C/s, finally with steel band or steel wire bundling at convenient for fortune
It is defeated and saleFinished product wire rod steel muscle.
Embodiment 2
The reinforcing bar of the present embodiment, each component is as shown in table 1, preparation method are as follows:
By molten iron pre-desulfurization, top and bottom complex blowing smelting is carried out after 120 tons of converters of nominal capacity are added in molten iron, steel scrap etc.,
Smelt into molten steel C content lower than 0.06%, P, S content lower than 0.035% tapping, tapping carry out to during 1/3~2/3 to
FeSi, FeMn, FeV alloy are added in molten steel and anthracite carries out Si, Mn, V and C element alloying, control molten steel V content is
0.060%；After molten steel arrival furnace after chain-wales, steel ladle immediately accesses pipeline, and the molten steel into ladle is blown into nitrogen, is blown into nitrogen
Gas 4min melt all kinds of alloys being added sufficiently and uniform；Steel ladle is electrically heated after reaching LF furnace, LF furnace refining after
The core-spun yarn containing Nb, N is fed in ladle, controlling Nb content in molten steel is 0.020%, and controlling N content in molten steel is 0.0300%, at
Conticaster is sent to cast after point trim process；It is used when being cast into 160mm × 160mm slab on 6 machines 6 stream billet caster
Protective casting, casting blank stacking cooled to room temperature；It is sent after slab cooling to high-speed rod-rolling mill production line, in heating stove heating
1120 DEG C of temperature, 1110 DEG C of soaking temperature, heating and soaking total time 120min, rolled through high-speed rod-rolling mill, laying temperature
935 DEG C, 650 DEG C are cooled to the cooling velocity of 5 DEG C/s first, is then cooled to 450 DEG C with the cooling velocity of 2.5 DEG C/s, most
The collection collection volume of steel is carried out after being cooled to 230 DEG C afterwards with the cooling velocity of 1.0 DEG C/s, finally with steel band or steel wire bundling at being convenient for
It transports and sellsFinished product wire rod steel muscle.
Embodiment 3
The reinforcing bar of the present embodiment, each component is as shown in table 1, preparation method are as follows:
By molten iron pre-desulfurization, top and bottom complex blowing smelting is carried out after 120 tons of converters of nominal capacity are added in molten iron, steel scrap etc.,
Smelt into molten steel C content lower than 0.06%, P, S content lower than 0.035% tapping, tapping carry out to during 1/3~2/3 to
FeSi, FeMn, FeV alloy are added in molten steel and anthracite carries out Si, Mn, V and C element alloying, control molten steel V content is
0.080%；After molten steel arrival furnace after chain-wales, steel ladle immediately accesses pipeline, and the molten steel into ladle is blown into nitrogen, is blown into nitrogen
Gas 4min melt all kinds of alloys being added sufficiently and uniform；Steel ladle is electrically heated after reaching LF furnace, LF furnace refining after
The core-spun yarn containing Nb, N is fed in ladle, controlling Nb content in molten steel is 0.030%, and controlling N content in molten steel is 0.0350%, at
Conticaster is sent to cast after point trim process；It is used when being cast into 150mm × 150mm slab on 6 machines 6 stream billet caster
Protective casting, casting blank stacking cooled to room temperature；It is sent after slab cooling to high-speed rod-rolling mill production line, in heating stove heating
965 DEG C of temperature, 1010 DEG C of soaking temperature, heating and soaking total time 150min, rolled through high-speed rod-rolling mill, laying temperature
910 DEG C, 700 DEG C are cooled to the cooling velocity of 7.9 DEG C/s first, is then cooled to 500 DEG C with the cooling velocity of 3 DEG C/s, most
The collection collection volume of steel is carried out after being cooled to 295 DEG C afterwards with the cooling velocity of 0.8 DEG C/s, finally with steel band or steel wire bundling at being convenient for
It transports and sellsFinished product wire rod steel muscle.
Comparative example
The reinforcing bar of this comparative example is common plus VN16 alloy HRB500E, and each component is as shown in table 1, preparation method are as follows:
By molten iron pre-desulfurization, top and bottom complex blowing smelting is carried out after 120 tons of converters of nominal capacity are added in molten iron, steel scrap etc.,
Smelt into molten steel C content lower than 0.06%, P, S content lower than 0.035% tapping, tapping carry out to during 1/3~2/3 to
FeSi, FeMn, VN16 are added in molten steel and anthracite carries out Si, Mn, V and C element alloying, VN16 additional amount is ton steel
1.50kg；After molten steel arrival furnace after chain-wales, steel ladle immediately accesses pipeline, and the molten steel into ladle is blown into nitrogen, is blown into nitrogen
Gas 4min melt all kinds of alloys being added sufficiently and uniform；The company of sending after the processing of LF furnace refinement and deoxidation, desulfurization and trimming
Casting machine is cast；When being cast into 150mm × 150mm slab on 6 machines 6 stream billet caster using protective casting, slab heap
Pile cooled to room temperature；It is sent after slab cooling to high-speed rod-rolling mill production line, at 1120 DEG C of heating furnace heating temperature, soaking
1110 DEG C of temperature, heating and soaking total time 120min, rolled through high-speed rod-rolling mill, 935 DEG C of laying temperature, first with 5 DEG C/
The cooling velocity of s is cooled to 650 DEG C, is then cooled to 450 DEG C with the cooling velocity of 2.5 DEG C/s, finally with the cooling of 1.0 DEG C/s
Speed carries out the collection collection volume of steel after being cooled to 230 DEG C, finally with steel band or steel wire bundling at being readily transported and sellFinished product wire rod steel muscle.
Each ingredient of Examples 1 to 3 and comparative example reinforcing bar, count by weight percentage, as shown in table 1, surplus Fe.
1 Examples 1 to 3 of table and comparative example reinforcing bar ingredient (wt.%)
| Project | C | Si | Mn | P | S | V | Nb | N |
| Comparative example | 0.23 | 0.58 | 1.42 | 0.019 | 0.015 | 0.111 | ? | 0.0215 |
| Embodiment 1 | 0.20 | 0.58 | 1.55 | 0.022 | 0.020 | 0.042 | 0.011 | 0.0266 |
| Embodiment 2 | 0.23 | 0.50 | 1.43 | 0.022 | 0.008 | 0.059 | 0.019 | 0.0302 |
| Embodiment 3 | 0.25 | 0.35 | 1.21 | 0.033 | 0.025 | 0.078 | 0.028 | 0.0350 |
Effete test embodiment
Mechanics Performance Testing is referring to " GB/T 1499.2-2018 concrete reinforcement steel part 2: hot rolled ribbed bars "
Carry out, measure the yield strength (Rel) of reinforcing bar, tensile strength (Rm), elongation after fracture (A), maximum, force breaking elongation (Agt),
Strong flexor ratio and mark ratio in the wrong.
Metallographic structure test is carried out referring to " the GB/T 13298-2015 metal microstructure method of inspection ", measures reinforcing bar
Metallographic structure composition.
Test result is as shown in table 2
The mechanical property and metallographic structure of 2 Examples 1 to 3 of table and comparative example reinforcing bar
As seen from Table 2, VN16 is more commonly added using the HRB500E reinforcing bar of present invention design ingredient and preparation method production
The HRB500E reinforced steel bar strength of alloy is high, plasticity is good, strong flexor ratio is high, and yield strength is in 550MPa or more, and tensile strength is in 820MPa
More than, elongation after fracture is 22% or more, and 12% or more, strong flexor ratio realizes excellent maximum, force breaking elongation 1.45 or more
Different intensity index and anti-seismic performance index.
It although the embodiments of the present invention have been disclosed as above, but for those skilled in the art, can be easily real
Now other modification, therefore without departing from the general concept defined in the claims and the equivalent scope, the present invention is not limited to
Specific details.
Claims (8)
- The 1.500MPa grades of anti-seismic steel bar wire rods containing V, Nb microalloy high yield ratio, which is characterized in that chemical component are as follows: by weight hundred Divide than counting, C:0.20%~0.25%, Si:0.35%~0.65%, Mn:1.20%~1.60%, P≤0.035%, S≤ 0.035%, V:0.040%~0.080%, Nb:0.010%~0.030%, N:0.0250%~0.0350%, remaining is Fe With inevitable impurity.
- 2. the 500MPa grades of method containing V, Nb microalloy high yield ratio anti-seismic steel bar wire rod as described in claim 1 is produced, including The following steps successively carried out, electric furnace or converter smelting, LF refining, continuous small-billet casting, heating steel billet, high-speed rod-rolling mill carry out Rolling becomes a useful person, cools down pole wire rod or screw wire rod is made, it is characterised in that: in electric furnace or converter smelting tapping process, adds The content for entering FeV adjustment V, the content of feeding Nb and N containing the adjustment of Nb, N core-spun yarn in LF furnace refining process, the wire rod chemistry at Divide by weight percentage, C:0.20%~0.25%, Si:0.35%~0.65%, Mn:1.20%~1.60%, P≤ 0.035%, S≤0.035%, V:0.040%~0.080%, Nb:0.010%~0.030%, N:0.0250%~ 0.0350%, remaining is Fe and inevitable impurity.
- 3. the 500MPa grades according to claim 2 production method containing V, Nb microalloy high yield ratio anti-seismic steel bar wire rod, It is characterized by: smelting C content into molten steel is lower than 0.06%, P, S content are tapped lower than 0.035%, tapping progress to 1/3~ FeSi, FeMn, FeV are added into molten steel when 2/3 and anthracite carries out Si, Mn, V and C element alloying, controls molten steel V content It is 0.040%~0.080%.
- 4. the 500MPa grades according to claim 2 or 3 producer containing V, Nb microalloy high yield ratio anti-seismic steel bar wire rod Method, it is characterised in that: the core-spun yarn containing Nb, N is fed in LF furnace refining process, adjust molten steel Nb content for 0.010%~ 0.030%, N content is 0.0250%~0.0350%.
- 5. according to described in any item 500MPa grades of claim 2~4 containing V, Nb microalloy high yield ratio anti-seismic steel bar wire rod Production method, it is characterised in that: in the heating steel billet and the operation of rolling, 960 DEG C~1230 DEG C of billet heating temperature, soaking temperature 1010 DEG C~1210 DEG C of degree, heating and soaking total time 100min~150min；It is 900 that high-speed wire rolling, which controls laying temperature, DEG C~970 DEG C.
- 6. according to described in any item 500MPa grades of claim 2~5 containing V, Nb microalloy high yield ratio anti-seismic steel bar wire rod Production method, it is characterised in that: roller repairing is cooled to 600 DEG C~700 DEG C first with 4 DEG C/s~8 DEG C/s cooling velocity, so 400 DEG C~500 DEG C are cooled to 2 DEG C/s~3 DEG C/s cooling velocity afterwards, finally with 0.5 DEG C/s~1.0 DEG C/s cooling velocity It is cooled to 150 DEG C~300 DEG C.
- 7. the 500MPa grades according to claim 1 anti-seismic steel bar wire rod containing V, Nb microalloy high yield ratio, it is characterised in that: The wire roll specification is
- 8. the 500MPa grades according to claim 1 anti-seismic steel bar wire rod containing V, Nb microalloy high yield ratio, it is characterised in that: Wire roll lower yield strength >=the 540MPa, tensile strength >=760MPa, elongation after fracture >=20%, maximum, force overall elongation Rate >=12%, strong flexor ratio >=1.40, microscopic structure are ferrite and pearlite.
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| CN110551945A (en) * | 2019-10-10 | 2019-12-10 | 阳春新钢铁有限责任公司 | optimization method of hot-rolled plain steel bar production process |
| CN111519100A (en) * | 2020-01-11 | 2020-08-11 | 武钢集团昆明钢铁股份有限公司 | Niobium-vanadium microalloyed 400 MPa-grade ultrafine-grain high-toughness anti-seismic reinforcing steel bar and preparation method thereof |
| CN111945079A (en) * | 2020-07-31 | 2020-11-17 | 阳春新钢铁有限责任公司 | Ultra-high pulling speed niobium-containing HRB500E deformed steel bar and production process thereof |
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| CN114082906A (en) * | 2021-11-17 | 2022-02-25 | 攀钢集团攀枝花钢铁研究院有限公司 | Production method of steel bar and steel bar |
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| CN110551945A (en) * | 2019-10-10 | 2019-12-10 | 阳春新钢铁有限责任公司 | optimization method of hot-rolled plain steel bar production process |
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| CN111519100A (en) * | 2020-01-11 | 2020-08-11 | 武钢集团昆明钢铁股份有限公司 | Niobium-vanadium microalloyed 400 MPa-grade ultrafine-grain high-toughness anti-seismic reinforcing steel bar and preparation method thereof |
| CN111945079A (en) * | 2020-07-31 | 2020-11-17 | 阳春新钢铁有限责任公司 | Ultra-high pulling speed niobium-containing HRB500E deformed steel bar and production process thereof |
| CN113403533A (en) * | 2021-05-28 | 2021-09-17 | 广西柳钢华创科技研发有限公司 | Method for producing HRB500E twisted steel bar by high-speed bar and HRB500E twisted steel bar produced by high-speed bar |
| CN113403533B (en) * | 2021-05-28 | 2022-04-12 | 广西柳钢华创科技研发有限公司 | Method for producing HRB500E twisted steel bar by high-speed bar and HRB500E twisted steel bar produced by high-speed bar |
| CN113444968A (en) * | 2021-06-10 | 2021-09-28 | 广西柳钢华创科技研发有限公司 | HRB400E general speed hot rolling ribbed steel bar with tensile strength above 700Mpa and production method thereof |
| CN113444968B (en) * | 2021-06-10 | 2022-04-12 | 广西柳钢华创科技研发有限公司 | HRB400E general speed hot rolling ribbed steel bar with tensile strength above 700Mpa and production method thereof |
| CN114082906A (en) * | 2021-11-17 | 2022-02-25 | 攀钢集团攀枝花钢铁研究院有限公司 | Production method of steel bar and steel bar |
| CN118186191A (en) * | 2024-05-15 | 2024-06-14 | 湖南华菱涟源钢铁有限公司 | High-strength deformed steel bar, rolling method thereof and preparation method of high-strength deformed steel bar |
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