CN109468534A - The 500MPa grades of high yield ratio anti-seismic steel bar wire rods of microalloy containing V and its production method - Google Patents
The 500MPa grades of high yield ratio anti-seismic steel bar wire rods of microalloy containing V 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
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
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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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- C22C33/06—Making ferrous alloys by melting using master alloys
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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
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
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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
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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Abstract
The invention belongs to Ferrous Metallurgys and steel rolling field, and in particular to a kind of 500MPa grades of microalloy containing V 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.The constituent that the present invention provides the 500MPa grades of high yield ratio anti-seismic steel bar bars of microalloy containing V is C:0.20~0.25%, Si:0.35~0.65%, Mn:1.20~1.60%, V:0.070~0.170%, N:0.0100~0.0120%.The key of preparation method is that VN16, FeV control molten steel N, V content are added in tapping process cooperates subsequent rolling mill practice in a certain range.The lower yield strength surplus capacity of reinforcing bar bar provided by the invention is larger, and strong flexor ratio reaches 1.45 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 microalloy containing V high yield ratio is anti-
Shake wire roll 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, wherein it is added to a large amount of N element, although having played the strengthening effect of vanadium,
Strong flexor ratio≤1.30 of the 500MPa reinforcing bar of production are unable to reach the intensity index that not only can guarantee reinforcing bar higher yield strength, but also
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 high yield ratio anti-seismic steel bar wire rods of microalloy containing V, chemical component are as follows: percentage by weight
Than counting, C:0.20%~0.25%, Si:0.35%~0.65%, Mn:1.20%~1.60%, P≤0.035%, S≤
0.035%, V:0.070%~0.170%, N:0.0100%~0.0120%, remaining is Fe and inevitable impurity.
Wherein, wire roll specification is
Wherein, wire roll lower yield strength >=540MPa, tensile strength >=760MPa, elongation after fracture >=20%, most
Breaking elongation >=12% energetically, strong flexor ratio >=1.40, microscopic structure are ferrite and pearlite.
The present invention also provides the production methods of the 500MPa grades of high yield ratio anti-seismic steel bar wire rods of microalloy containing V, including successively
The following steps of progress: electric furnace or converter smelting, LF refining, continuous small-billet casting, heating steel billet, high-speed rod-rolling mill are rolled
It becomes a useful person, cool down pole wire rod or screw wire rod is made.In electric furnace or converter smelting tapping process, VN alloy, FeV tune is added
The content of whole 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:0.070%~0.170%, N:0.0100%
~0.0120%, 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
In 0.035% tapping, FeSi, FeMn, VN alloy, FeV and anthracite is added when tapping is carried out to 1/3~2/3 into molten steel
Si, Mn, V and C element alloying are carried out, control molten steel N content is 0.0100%~0.0120%, V content is 0.070%~
0.170%.
Wherein, VN alloy VN16.
Wherein, the additional amount of VN16 is ton steel 0.60kg~0.75kg.
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~
1210 DEG C, heating and soaking total time 100min~150min, high-speed wire rolling control laying temperature are 900 DEG C~970 DEG C.
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:
1,500MPa grades of microalloy containing V high yield ratio anti-seismic steel bar wire rod provided by the invention has high-intensitive and high simultaneously
The characteristics of antidetonation, 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:0.070%~0.170%, N:0.0100%~0.0120%,
Remaining is Fe and inevitable impurity, 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, and specification includes
2, VN16 alloy is added in electric furnace or converter tapping process and carries out vanadium alloying by the present invention, while being added together
FeV alloy carries out vanadium alloying to supplement vanadium, and being stably controlled molten steel N content is 0.0100%~0.0120%, and V content is
0.070%~0.170%, while cooperating subsequent rolling mill practice, the wire rod yield strength surplus capacity produced is big, realizes
Yield strength and strong flexor ratio are taken into account, so that 500MPa wire roll has the characteristics that high-intensitive and high anti-seismic simultaneously.
Specific embodiment
The present invention provides the 500MPa grades of high yield ratio anti-seismic steel bar wire rods of microalloy containing V, chemical component are as follows: percentage by weight
Than counting, C:0.20%~0.25%, Si:0.35%~0.65%, Mn:1.20%~1.60%, P≤0.035%, S≤
0.035%, V:0.070%~0.170%, N:0.0100%~0.0120%, remaining is Fe and inevitable impurity.
The present invention provides the 500MPa grades of high yield ratio anti-seismic steel bar wire rods of microalloy containing V, and specification includesLower yield strength >=540MPa, tensile strength >=760MPa, elongation after fracture >=20%, maximum, force are total
Elongation percentage >=12%, strong flexor ratio >=1.40, microscopic structure are 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.To protect
The synthesis of card reinforcing bar high-yield strength and high yield ratio anti-seismic performance is taken into account, and the range of N content is selected as 0.0100% in the present invention
~0.0120%.
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 production methods of the 500MPa grades of high yield ratio anti-seismic steel bar wire rods of microalloy containing V, including successively
The following steps of progress: electric furnace or converter smelting, LF refining, continuous small-billet casting, heating steel billet, high-speed rod-rolling mill are rolled
It becomes a useful person, cool down pole wire rod or screw wire rod is made.In electric furnace or converter smelting tapping process, VN alloy, FeV tune is added
The content of whole 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:0.070%~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 need to add more content is just able to satisfy intensity requirement, by
In under normal circumstances molten steel addition vanadium in vanadium nitrogen alloy and nitrogen ratio be it is fixed, mainly have VN12, VN14 and VN16
Three trades mark, in the case where meeting intensity requirement, with increasing for vanadium, nitrogen element content also increases, and can generally reach
Between 0.0120%~0.0300%, the strong flexor ratio of reinforcing bar is relatively low and unstable at this time, therefore the present invention selects that the conjunction of vanadium nitrogen is added
Gold, FeV mode control the content of N, V.
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
In 0.035% tapping, FeSi, FeMn, VN alloy, FeV and anthracite is added when tapping is carried out to 1/3~2/3 into molten steel
Si, Mn, V and C element alloying are carried out, control molten steel N content is 0.0100%~0.0120%, V content is 0.070%~
0.170%.
The present invention selects tapping that FeSi, FeMn, VN alloy, FeV and nothing is added when carrying out to 1/3~2/3 into molten steel
Bituminous coal carries out Si, Mn, V and C element alloying, be intended to control by VN alloy nitrogen content 0.0100%~
0.0120%, remaining vanadium is supplemented by the way that FeV alloy is added, and the final molten steel N content that controls is 0.0100%~0.0120%, V
Content be 0.070%~0.170%, can play V it is certain precipitation strength effect make yield strength promoted and
Keep the decline of reinforcing bar strong flexor ratio index too many.In addition, carrying out element alloyed saving the production time simultaneously.
Preferably, in order to accurately control molten steel N content be 0.0100%~0.0120%, V content be 0.070%~
0.170%, the additional amount that tapping carries out VN16 alloy when to 1/3~2/3 is ton steel 0.60kg~0.75kg, remaining vanadium by plus
Enter FeV alloy to supplement.
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~
1210 DEG C, heating and soaking total time 100min~150min, high-speed wire rolling control laying temperature are 900 DEG C~970 DEG C.
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, VN16, FeV alloy are added in molten steel and anthracite carries out Si, Mn, V and C element alloying, wherein VN16 alloy
It is quantitatively adding by ton steel 0.62kg, remaining V is then supplied with FeV alloy, and control molten steel N content is 0.0100%；Molten steel reaches furnace
Afterwards after chain-wales, steel ladle immediately accesses pipeline, and the molten steel into ladle is blown into nitrogen, is blown into nitrogen 4min, makes to be added each
Class alloy sufficiently melt and uniformly；Conticaster is sent to cast after the processing of LF furnace refinement and deoxidation, desulfurization and trimming；6
Machine 6 flows when being cast into 160mm × 160mm slab on billet caster using protective casting, casting blank stacking cooled to room temperature；
Sent after slab cooling to high-speed rod-rolling mill production line, at 1210 DEG C of heating furnace heating temperature, 1200 DEG C of soaking temperature, heating and
It soaking total time 100min, rolls, 967 DEG C of laying temperature, is cooled to first with the cooling velocity of 4 DEG C/s through high-speed rod-rolling mill
605 DEG C, be then cooled to 400 DEG C with the cooling velocity of 2 DEG C/s, finally with the cooling velocity of 1.0 DEG C/s be cooled to 150 DEG C it is laggard
The collection collection of row steel is rolled up, finally with steel band or steel wire bundling at being readily transported and sellFinished 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, VN16, FeV alloy are added in molten steel and anthracite carries out Si, Mn, V and C element alloying, wherein VN16 alloy
It is quantitatively adding by ton steel 0.68kg, remaining V is then supplied with FeV alloy, and control molten steel N content is 0.0110%；Molten steel reaches furnace
Afterwards after chain-wales, steel ladle immediately accesses pipeline, and the molten steel into ladle is blown into nitrogen, is blown into nitrogen 4min, makes to be added each
Class alloy sufficiently melt and uniformly；Conticaster is sent to cast after the processing of LF furnace refinement and deoxidation, desulfurization and trimming；6
Machine 6 flows when being cast into 160mm × 160mm slab on billet caster using protective casting, casting blank stacking cooled to room temperature；
Sent after slab cooling to high-speed rod-rolling mill production line, at 1110 DEG C of heating furnace heating temperature, 1120 DEG C of soaking temperature, heating and
It soaking total time 120min, rolls, 939 DEG C of laying temperature, is cooled to first with the cooling velocity of 5 DEG C/s through high-speed rod-rolling mill
655 DEG C, 450 DEG C then are cooled to the cooling velocity of 2.5 DEG C/s, after being finally cooled to 230 DEG C with the cooling velocity of 1.0 DEG C/s
The collection collection volume of steel is carried out, finally with steel band or steel wire bundling at being readily transported and sellFinished 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, VN16, FeV alloy are added in molten steel and anthracite carries out Si, Mn, V and C element alloying, wherein VN16 alloy
It is quantitatively adding by ton steel 0.75kg, remaining V is then supplied with FeV alloy, and control molten steel N content is 0.0115%；Molten steel reaches furnace
Afterwards after chain-wales, steel ladle immediately accesses pipeline, and the molten steel into ladle is blown into nitrogen, is blown into nitrogen 4min, makes to be added each
Class alloy sufficiently melt and uniformly；Conticaster is sent to cast after the processing of LF furnace refinement and deoxidation, desulfurization and trimming；6
Machine 6 flows when being cast into 150mm × 150mm slab on billet caster using protective casting, casting blank stacking cooled to room temperature；
Sent after slab cooling to high-speed rod-rolling mill production line, at 975 DEG C of heating furnace heating temperature, 1015 DEG C of soaking temperature, heating and
It soaking total time 150min, is rolled through high-speed rod-rolling mill, 905 DEG C of laying temperature, it is cooling with the cooling velocity of 7.9 DEG C/s first
To 695 DEG C, 500 DEG C then are cooled to the cooling velocity of 3 DEG C/s, after being finally cooled to 295 DEG C with the cooling velocity of 0.8 DEG C/s
The collection collection volume of steel is carried out, finally with steel band or steel wire bundling at being readily transported and sellFinished product wire rod steel muscle.
Comparative example
The reinforcing bar of this comparative example is common plus VN16 alloy HRB500E, makes V content 0.070%~0.170%, respectively
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 1110 DEG C of heating furnace heating temperature, soaking
1120 DEG C of temperature, heating and soaking total time 120min, rolled through high-speed rod-rolling mill, 940 DEG C of laying temperature, first with 5 DEG C/
The cooling velocity of s is cooled to 655 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 | N |
| Comparative example | 0.23 | 0.58 | 1.42 | 0.019 | 0.015 | 0.111 | 0.0215 |
| Embodiment 1 | 0.21 | 0.62 | 1.58 | 0.020 | 0.010 | 0.165 | 0.0103 |
| Embodiment 2 | 0.23 | 0.55 | 1.43 | 0.023 | 0.022 | 0.132 | 0.0109 |
| Embodiment 3 | 0.24 | 0.41 | 1.24 | 0.030 | 0.031 | 0.075 | 0.0119 |
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 800MPa
More than, elongation after fracture is 20% 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 (9)
- The 1.500MPa grades of high yield ratio anti-seismic steel bar wire rods of microalloy containing V, which is characterized in that chemical component are as follows: percentage by weight Than counting, C:0.20%~0.25%, Si:0.35%~0.65%, Mn:1.20%~1.60%, P≤0.035%, S≤ 0.035%, V:0.070%~0.170%, N:0.0100%~0.0120%, remaining is Fe and inevitable impurity.
- 2. the method for producing 500MPa grades of microalloy containing V high yield ratio anti-seismic steel bar wire rod as described in claim 1, including successively The following steps of progress, electric furnace or converter smelting, LF refining, continuous small-billet casting, heating steel billet, high-speed rod-rolling mill are rolled It becomes a useful person, cool down pole wire rod or screw wire rod is made, it is characterised in that: in electric furnace or converter smelting tapping process, vanadium is added The content of nitrogen alloy, FeV adjustment 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:0.070%~0.170%, N: 0.0100%~0.0120%, remaining is Fe and inevitable impurity.
- 3. the production method of 500MPa grades of microalloy containing V high yield ratio anti-seismic steel bar wire rod according to claim 2, special Sign is: smelting into molten steel C content and is lower than 0.06%, P, S content are carried out lower than 0.035% tapping, tapping to 1/3~2/3 When FeSi, FeMn is added into molten steel, VN alloy, FeV and anthracite carry out Si, Mn, V and C element alloying, control molten steel N content is 0.0100%~0.0120%, and V content is 0.070%~0.170%.
- 4. the production method of 500MPa grades of microalloy containing V high yield ratio anti-seismic steel bar wire rod according to claim 2 or 3, It is characterized by: the VN alloy is VN16.
- 5. the production method of 500MPa grades of microalloy containing V high yield ratio anti-seismic steel bar wire rod according to claim 4, special Sign is: the additional amount of the VN16 is ton steel 0.60kg~0.75kg.
- 6. according to the production of described in any item 500MPa grades of microalloy containing the V high yield ratio anti-seismic steel bar wire rods of claim 2~5 Method, it is characterised in that: 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 ~1210 DEG C, heating and soaking total time 100min~150min, high-speed wire rolling control laying temperature are 900 DEG C~970 ℃。
- 7. according to the production of described in any item 500MPa grades of microalloy containing the V high yield ratio anti-seismic steel bar wire rods of claim 2~6 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, then with The cooling velocity of 2 DEG C/s~3 DEG C/s is cooled to 400 DEG C~500 DEG C, finally cooling with 0.5 DEG C/s~1.0 DEG C/s cooling velocity To 150 DEG C~300 DEG C.
- 8. 500MPa grades of microalloy containing V high yield ratio anti-seismic steel bar wire rod according to claim 1, it is characterised in that: institute Stating wire roll specification is
- 9. 500MPa grades of microalloy containing V high yield ratio anti-seismic steel bar wire rod according to claim 1, it is characterised in that: institute State wire roll 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.
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