CN110343962A - A kind of 700Mpa grades or more hot-rolled ribbed high tensile reinforcement steel and its production method - Google Patents
A kind of 700Mpa grades or more hot-rolled ribbed high tensile reinforcement steel and its production method Download PDFInfo
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- CN110343962A CN110343962A CN201910682796.6A CN201910682796A CN110343962A CN 110343962 A CN110343962 A CN 110343962A CN 201910682796 A CN201910682796 A CN 201910682796A CN 110343962 A CN110343962 A CN 110343962A
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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
- 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
- C21D8/08—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires for concrete reinforcement
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
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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
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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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
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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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
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
Abstract
The invention discloses a kind of 700Mpa grades or more hot-rolled ribbed high tensile reinforcement steel and its production methods, belong to hot rolled ribbed bars technical field；Hot-rolled ribbed high tensile reinforcement is formed with its chemical analysis of steel and mass percentage content are as follows: C:0.20~0.50%, Si:0.80~1.20%, Mn:1.00~1.50%, V:0.10~0.25%, N:0.015~0.025%, Cr:0.40~1.00%, P :≤0.025%, S :≤0.010%, remaining is Fe and inevitable impurity element；Using microalloying design, converter (or electric arc furnaces) steel-making, bar low temperature temperature-controlled rolling technique, under the conditions of steel enterprise prior art equipment, appropriate increase power of motor 10%, it can be realized the large-scale industrial production of 700Mpa grades of reinforcing bars, to meet the needs of China's high level, large-span steel-reinforced concrete building structure.
Description
Technical field
The invention belongs to hot rolled ribbed bars technical fields, more specifically to a kind of 700Mpa grades or more hot-rolled strip
Rib high tensile reinforcement steel and its production method.
Background technique
Being commonly called as hot rolled ribbed bars is screw-thread steel, is widely used in the construction of the civil engineerings such as house, bridge, road.
Hot rolled ribbed bars service condition is that 335Mpa grades are eliminated already, and external English, moral, Australia, method etc. are widely used both at home and abroad at present
500Mpa grades of high tensile reinforcements of yield strength, there has also been extensive application for 600Mpa grades of high tensile reinforcements, and just promote in active development
700Mpa grades of high tensile reinforcements.The appearance of policy, high tensile reinforcement dosage are promoted and applied recently as a series of high tensile reinforcements in China
Percentage rises year by year.Currently, country's HRB500 high tensile reinforcement has been produced in enormous quantities, used, 600Mpa grades of high tensile reinforcements are domestic
Large Steel enterprise is researched and developed successfully using microalloying technique.The national standard GB1499.2 come into effect from November 1st, 2018~
By hot-rolled reinforced bar according to three strength grades in 2018 " hot-rolled ribbed steel bars for ther reinforcement of concrete ", two trade mark series are wrapped altogether
Include HRB400, HRB500, HRB600, HRB400E, HRB500E and HRBF400, HRBF500, HRBF400E, HRBF500E
Nine reinforcing bar trades mark.Compared to national standard GB/T 1499~2007 " hot-rolled ribbed steel bars for ther reinforcement of concrete " before, increase newly
The hot rolled ribbed bars of 600Mpa intensity rank.With China is high-rise, long span building continue to bring out and national energy-saving subtracts
The requirement of row, structural steel lightweight policy can predict that 700Mpa grade high-strength reinforcing bar will be that the direction of the market demand is developed.
Relative to the treatment process of other steel grades complexity such as structural steel, for cost consideration and building iron in addition to main
Strength character, not high for other performance requirements, building iron needs to reduce treatment process and related investment as far as possible, to obtain
Take enough performance requirements and lower cost.Chinese Patent Application No. are as follows: 201610867389.9, the applying date are as follows:
2016.09.29 " a kind of 630Mpa grades of high-strength hot-rolled steel bar steel and preparation method thereof ", by weight percentage composition contain
Have: 0.22~0.28%C, 0.40~0.80%Si, 1.40~1.60%Mn ,≤0.035%P ,≤0.035%S, 0.02~
0.04%Nb, 0.05~0.07%V, 0.20~0.40%Cr, 0.008~0.012%N, remaining for Fe and inevitably it is miscellaneous
Prime element.Processing method includes the following steps: the smelting in converter, electric arc furnaces or other smelting furnaces using said ratio and component
Refining；The outer ladle argon-blown refining of furnace；140 or 150 continuous small-billet castings；It is rolled on bar mill using thermal mechanical rolling technique；It is cooling.Its
The microalloying mode combined using V, Nb, using cooling controlling and rolling controlling process, the 630Mpa grade reinforcement property of production is stablized, resultant force
Learn better performances.Its shortcoming is that: the reinforced steel bar strength rank of production can only achieve 630Mpa rank, cannot reach this application claims
Intensity rank, and joined alloy element Nb, increase the investment of cost, be unfavorable for the reduction of cost.
Chinese Patent Application No. are as follows: 201410795809.8, the applying date are as follows: 2014.12.18's is " a kind of 600Mpa grades high
Strong reinforcing bar steel and its thermal mechanical rolling method ", by weight percentage component include: 0.20~0.26%C, and 0.40~0.60%
Si, 1.40~1.60%Mn ,≤0.040%P ,≤0.040%S, 0.03~0.05Nb, 0.03~0.05%V, 0.15~
0.45%Cr, 0.008~0.012%N, remaining is Fe and inevitable impurity element.Milling method includes the following steps:
(1) it is smelted according to the proportion with component；(2) it refines；(3) continuous small-billet casting；(4) TMCP technique rolls；(5) cooling.This hair
Bright combination prior art equipment condition, devises the composition range of resource-conserving under prior art equipment condition, and passes through
Thermal mechanical rolling technique (TMCP) makes intensity rank reach 600Mpa under the premise of not reducing plasticity, to meet high-rise, large span
The needs of building structure；Its shortcoming is that: (1) yield strength rank be 600Mpa, far below this application claims intensity rank；
(2) contribution of the cheap N element to reinforced steel bar strength performance is not given full play to, cost of alloy is higher, is unfavorable for saving alloy resource.
Chinese Patent Application No. are as follows: 201710827773.0, the applying date are as follows: 2017.09.14's is " a kind of 630Mpa grades high
Obdurability hot rolled ribbed bars and its production method ", Ribbed Bar chemical component composition and mass percentage are as follows: C:0.20~
0.25%, Mn:1.50~1.60%, Si:0.60~0.75%, V:0.08~0.15%, Cr:0.30~0.35%, N:0.012
~0.025%, P:0.005~0.025%, S:0.005~0.025%, remaining is Fe and inevitable impurity；Ribbed Bar
Production method includes smelting, refining, continuous casting, heating and rolling process.It utilizes cheap alloying element, substitution nickel, saw, molybdenum etc.
Expensive alloying element, reduces the cost of hot rolled ribbed bars, while improving the practicability and peace of building to a certain extent
Quan Xing；Using easy smelting process and rolling mill practice, it is advantageously implemented the large-scale production of low cost；Its shortcoming is that: (1)
Yield strength rank be 630Mpa, lower than this application claims intensity rank；(2) it though production technology is simple, does not give full play to
The refinement crystal grain of low temperature temperature-controlled rolling technique, the effect for improving intensity index.
Summary of the invention
1. solving the problems, such as
Aiming at the problem that intensity that existing hot rolled ribbed bars steel is not able to satisfy building structure needs, the present invention provides one kind
700Mpa grades or more hot-rolled ribbed high tensile reinforcement steel and its production method；Using microalloying design, converter (or electric arc furnaces)
Steel-making, bar low temperature temperature-controlled rolling technique can under the conditions of steel enterprise prior art equipment, appropriate increase power of motor 10%
The large-scale industrial production of 700Mpa grades of reinforcing bars is realized, to meet the need of China's high level, large-span steel-reinforced concrete building structure
It wants.
2. technical solution
To solve the above-mentioned problems, the technical solution adopted in the present invention is as follows:
The hot-rolled ribbed high tensile reinforcement steel of of the invention a kind of 700Mpa grades or more, the hot-rolled ribbed high tensile reinforcement steel
Its chemical analysis composition and mass percentage content are as follows: C:0.20~0.50%, Si:0.80~1.20%, Mn:1.00~
1.50%, V:0.10~0.25%, N:0.015~0.025%, Cr:0.40~1.00%, P :≤0.025%, S :≤
0.010%, remaining is Fe and inevitable impurity element.
As a preferred solution of the present invention, the hot-rolled ribbed high tensile reinforcement its chemical analysis of steel composition and quality percentage
Compare content are as follows: C:0.20~0.30%, Si:0.80~1.20%, Mn:1.30~1.50%, V:0.10~0.20%, N:
0.015~0.025%, Cr:0.40~0.60%, P :≤0.025%, S :≤0.010%, remaining for Fe and inevitably it is miscellaneous
Prime element.
As a preferred solution of the present invention, the hot-rolled ribbed high tensile reinforcement its chemical analysis of steel composition and quality percentage
Compare content are as follows: C:0.30~0.40%, Si:0.80~1.20%, Mn:1.00~1.20%, V:0.15~0.25%, N:
0.015~0.025%, Cr:0.80~1.00%, P :≤0.020%, S :≤0.010%, remaining for Fe and inevitably it is miscellaneous
Prime element.
As a preferred solution of the present invention, the hot-rolled ribbed high tensile reinforcement its chemical analysis of steel composition and quality percentage
Compare content are as follows: C:0.40~0.50%, Si:0.80~1.20%, Mn:1.00~1.20%, V:0.15~0.25%, N:
0.015~0.025%, Cr:0.80~1.00%, P :≤0.020%, S :≤0.010%, remaining for Fe and inevitably it is miscellaneous
Prime element.
The production method of the hot-rolled ribbed high tensile reinforcement steel of of the invention a kind of 700Mpa grades or more, comprising the following steps:
S1, converter or electric-arc furnace steelmaking, and slag-stopping tapping (ladle is flowed into containing the harmful elements such as P, S, such as clinker in slag,
Molten steel is then caused to return P, return S), 1635~1675 DEG C of tapping temperature, in tapping 1/4, alloy is added, the alloy in tapping 3/4
Addition finishes；Opportunity for adding from alloying element to molten steel, which is chosen, to be very important, and (1) alloying element will be in molten steel
Rapid melting, and can be evenly distributed, this temperature for requiring alloying element addition to enter molten steel needs to reach alloying element
The above certain temperature of fusion temperature, it is ensured that melting efficiency；Alloying element is uniformly distributed, and needs to have in molten steel in order to save time
Certain mobility promotes the composition interaction in molten steel, accelerates uniform ingredients.(2) recovery rate of alloy wants high, reduces production
Cost, it is desirable to reduce the consumption that alloying element is generated due to other reasons.(3) temperature shadow of the alloying element being added for molten steel
Sound should not be excessive, and temperature influence is excessive, is unfavorable for the progress normally produced.Therefore selection is added during tapping into molten steel
Alloying element, the mobility of molten steel is larger in tapping process, reduces the time of alloying element fusing, homogenization, while using going out
The souring of molten steel during steel, the process for saving stirring, last one of the work tapped as molten steel in converter or electric furnace
Sequence, the influence that alloying element generates the generation corresponding change effect of molten steel temperature to the subsequent production of molten steel is smaller, alloy
The recovery rate of element is high.In tapping process, tapping molten steel early period is easy to happen splash, and alloying element is added and is easy splash to steel
The fusing time of packet or tundish walls, later period molten steel of tapping is short, is unsuitable for alloying progress.
S2, ladle argon-blown gas, argon blowing time >=5min；Make top and the bottom molten steel component in ladle, temperature uniformity, comes
Guarantee uniform, the stability of reinforcement property.
The refining of S3, LF furnace, is passed through argon gas to LF furnace, and slag former is added；After molten steel to LF furnace, first using 250L/min's
Flow Argon 2 minutes, the flow for being then transferred to 95L/min continued Argon.Slag former is added and makes the de- S of white slag, de- P, slag making time
≤ 28 minutes.
The weak stirring of S4, Argon, mixing time >=15min；Keep molten steel component, temperature further uniform.
S5, billet continuous casting, continuous casting process is using whole process protection casting (preventing molten steel secondary oxidation, form field trash)；150
Billet continuous casting, the casting of continuous casting whole process protection, work 2.50~3.00m/min of pulling rate, 90~120m of crystallizer water flow3/h；Two
Secondary cooling 0.4~0.8L/kg of specific water.
S6, bar mill low temperature controlled rolling.Bar mill uses low temperature temperature-controlled rolling technique, being capable of energy conservation, saving alloy use
Amount, and growing up for austenite grain is controlled, control the size of crystal grain.
As a preferred solution of the present invention, converter or electric arc furnaces terminal C >=0.05%, P, S in the step S1≤
0.015%, the addition sequence of alloy is followed successively by deoxidier and (in order to reduce the oxidational losses of the alloys such as Si, Mn, V, improves alloy and return
Yield) → silicomangan → Antaciron → deoxidier → ferrochrome → VN alloy.It needs to control molten steel in converter or eaf tapping point
In metal element content, while needing the oxygen content in strict control molten steel, during alloying, need constantly into
Row deoxidation.
As a preferred solution of the present invention, after molten steel enters LF furnace in the step S3, the flow of 250L/min is first used
Argon 2 minutes, the flow for being then transferred to 95L/min continued Argon, slag making time≤28 minute.
As a preferred solution of the present invention, in the step S5 whole process protection casting in the tundish molten steel degree of superheat≤30
DEG C, secondary cooling zone carries out weak cold, slab straightening temperature >=950 DEG C.
As a preferred solution of the present invention, the Casting speed be 2.50~3.00m/min, crystallizer water flow 90~
120m3/h；0.4~0.8L/kg of secondary cooling specific water (avoids steel billet from the metallurgical imperfections such as corner crack occur, guarantees steel billet matter
Amount).
As a preferred solution of the present invention, in the step S6 bar mill low temperature controlled rolling specifically includes the following steps:
Step 1: heating, temperature range is at 1050~1150 DEG C；
Step 2: starting to roll, start rolling temperature range is at 920~970 DEG C；
Step 3: finish rolling, final rolling temperature range is at 800~850 DEG C；
Step 4: upper cold bed, temperature on cooling table range is 700~850 DEG C.
Square billet temperature after continuous casting is lower, rolls after needing to be reheated slab, and heating temperature needs reach
On austenitizing temperature, and temperature is correspondingly improved, so that square billet inner tissue is completely transformed into austenite phase, is just able to achieve
Later period rolls and is cooled into the effect of corresponding metallographic structure, therefore heating temperature is selected as 1050~1150 DEG C.
When starting rolling, rolling temperature is high, and the austenite grain of formation is coarse, influences steel final strength, but roll
Temperature is low, and rolling difficulty is big, higher for the power requirement of machine, it is not easy to roll, therefore widespread practice is to give up in industry
Zerolling bring enhanced strength, using the method for high temperature rolling, the present invention overcomes the prejudice in industry, are rolled using low temperature
System, and be adjusted correspondingly on rolling machine simultaneously, 10% bearing power of motor is improved, motor will not be damaged, together
When be able to satisfy needs in work, complete requirement of the zerolling for rolling machine, accomplish scale production.
The rolling mill practice of reinforcing bar is pair rolling technique, after starting rolling in roll and the finish rolling stage, that is, enter
Austenite phase field, the groundwork rolled in this stage are to be crushed austenite grain, from new forming core, to reach refinement
The effect of crystal grain, the temperature of austenite forming core again is more crucial at this time, selects suitable rolling temperature, the austenite crystal of formation
Grain is more tiny, and the intensity of reinforcing bar is higher, and corresponding alloying element also has a great impact to it.
It is rolled in and needs to carry out steel billet cooling between finish rolling, replys, cooling section makes temperature be reduced to finish rolling requirement model
In enclosing, replying section makes the temperature in rolled piece section reach unanimity, the fluctuation of performance caused by avoiding because of temperature unevenness.Final rolling temperature 800
~850 DEG C, so that reinforcing bar tissue crystal grain is tiny, to obtain good comprehensive mechanical property.But it since rolling temperature is lower, rolls
The resistance of deformation of part increases, and the motor load of milling train is caused to become larger, and influences to produce direct motion.By bar mill through properly increasing motor
Low temperature temperature-controlled rolling technique can be realized, to accomplish scale production in bearing power 10%.
3. beneficial effect
Compared with the prior art, the invention has the benefit that
(1) a kind of 700Mpa grades of present invention or more hot-rolled ribbed high tensile reinforcement steel and its production method, passes through microalloy
The ingredient of change designs, and combines process for making, bar low temperature temperature-controlled rolling technique production high intensity, the 700Mpa grade heat of high-ductility
Rolled rib steel bar, yield strength >=700Mpa, tensile strength >=875Mpa, elongation after fracture >=14% are always stretched under maximum, force
Long rate >=7.5%.Key technology to be solved is to provide the design of alloy and steel-making of a kind of 700Mpa grades of high tensile reinforcement
Technique, low temperature temperature-controlled rolling technique, to realize industrial mass production；
(2) of the invention a kind of 700Mpa grades or more hot-rolled ribbed high tensile reinforcement steel and its production method, converter terminal C
>=0.05%, avoid molten steel peroxidating；P, S≤0.015% and slag-stopping tapping reduce molten steel and return P, return S；Ladle argon-blown promotes
Molten steel component, temperature are uniform；LF furnace takes off S, de- P and fine tuning chemical component to target zone, obtains the molten steel of ingredient qualification；Argon
Weak stir keeps molten steel component, temperature further uniform, is conducive to casting；Billet continuous casting is poured using whole process protection, prevents the two of molten steel
Secondary pollution, it is ensured that produce high-quality steel billet；
(3) of the invention a kind of 700Mpa grades or more hot-rolled ribbed high tensile reinforcement steel and its production method are rolled with conventional
System is different, and low temperature temperature-controlled rolling technique requires zerolling, and zerolling is other than it can be reduced heating energy consumption, moreover it is possible to which refinement is brilliant
Grain improves product comprehensive mechanical property, but since rolled piece stocking resistance of deformation increases, therefore requires to improve existing stand motor power
10%, to meet the requirement of larger roll-force.
Detailed description of the invention
Technical solution of the present invention is described in further detail below with reference to drawings and examples, but should
Know, these attached drawings are designed for task of explanation, therefore not as the restriction of the scope of the invention.In addition, except non-specifically
It points out, these attached drawings are meant only to conceptually illustrate structure construction described herein, without to be drawn to scale.
Fig. 1 is V (C, N) precipitate pattern (stain)；
Fig. 2 be embodiment 1 in the metallographic structure of reinforcing bar product (white~ferrite, black~pearlite) 12 grades of grain size ×
500；
Fig. 3 is reinforcing bar product surface metallographic structure in embodiment 2, bainite × 500；
Fig. 4 is reinforcing bar product surface metallographic structure in embodiment 3, tempered sorbite × 500.
Specific embodiment
Hereafter to the detailed description of exemplary embodiment of the present invention with reference to attached drawing, which forms one of description
Point, it has been shown as example enforceable exemplary embodiment of the invention in the figure.Although these exemplary embodiment quilts
Sufficiently describe in detail so that those skilled in the art can implement the present invention, it is to be understood that can realize other embodiments and
Can without departing from the spirit and scope of the present invention to the present invention various changes can be made.Hereafter to the embodiment of the present invention
More detailed description is not limited to required the scope of the present invention, and just to be illustrated and do not limit pair
The description of the features of the present invention and feature to propose to execute best mode of the invention, and is sufficient to make those skilled in the art
It can implement the present invention.Therefore, the scope of the invention is only defined by the appended claims.
The hot-rolled ribbed high tensile reinforcement steel of of the invention a kind of 700Mpa grades or more, its change of steel of hot-rolled ribbed high tensile reinforcement
Study part composition and mass percentage content are as follows: C:0.20~0.50%, Si:0.80~1.20%, Mn:1.00~1.50%,
V:0.10~0.25%, N:0.015~0.025%, Cr:0.40~1.00%, P :≤0.025%, S :≤0.010%, remaining
For Fe and inevitable impurity element.
C is a kind of cheap element, can significantly improve the intensity of steel, but can reduce the extension property of steel, while increasing steel
Cold short performance and aging sensitivity.Generally when guaranteeing that the intensity of steel reaches requirement, the content of C should be limited as far as possible.This
The content for inventing C is 0.20~0.50%.
Si forms solid solution in steel, plays solution strengthening effect, can improve the intensity of steel, but more than 2% when can significantly drop
Plasticity, the toughness of low steel.Si content of the present invention is 0.80~1.20%.
Mn can improve the harden ability of steel, can significantly improve the intensity of low-carbon, middle carbon pearlitic steel.But when Mn content is higher,
The tendency of crystalline grain of steel roughening increases, and steel belt roof bolt brittleness sensibility increases.Mn content of the present invention is 1.00~1.50%.
V primarily serves precipitation strength effect in steel, moreover it is possible to play refined crystalline strengthening, solution strengthening effect, but be added excessive
Then not only waste of resource, and invigoration effect weakens.The present invention, V content range is 0.10~0.25% in steel.
N is considered as a kind of harmful element in the past, will increase the tendency of hardenability of steel, steel is made to become fragile.Later research discovery
N is added in steel can promote the intensity of steel, corrosion resisting property etc., and especially in steel containing V, N can improve the precipitation strength effect of V.This hair
N content range is 0.015~0.025% in bright steel.
The application improves the precipitation strength effect of V (C, N) by way of VN alloy is added.N is distributed shape to V in steel
The influence of formula is shown in that Fig. 1, VN alloy occur in the form of stain in steel, and the work of precipitation strength and solution strengthening is played to steel
With, while alloying element can also carry out refined crystalline strengthening to steel, V also have the function of refining crystal grain, and VC, VN particle is tiny, can be with
Play the role of pinning austenite grain boundary, austenite is inhibited to grow up.V and N has stronger binding force, and the VN crystal grain of formation is thinner
It is small.Compound reinforcing is so that the intensity of steel is significantly promoted, therefore in the alloying process to V, when using VFe alloy, and V
Mainly it is present in steel with to be dissolved state and plays invigoration effect, and solution strengthening effect is less than the precipitation strength of V (C, N)；Using VN
When alloy, due to there is the presence of N, mainly with the form precipitation strength of V (C, N).And if to be formed between V and C and N
Compound, and can have good invigoration effect to steel, need the content to C, V and N element in steel to be defined, through mould
Quasi- measuring and calculating obtains, and meets 4wt%N≤wt%V≤wt%C+wt%N, the steel strength produced, and according to the low temperature of the application
Rolling mill practice carries out, and the intensity of obtained concrete-steel is greater than 700Mpa, significantly larger than national standard and in the market existing reinforcing bar
Intensity, and other mechanical properties of reinforcing bar are also kept well, meet the corresponding demand of reinforcing bar industry.
The souring that VN alloy utilizes high-temperature molten steel is added in the application in converter tapping process, keeps V abundant in steel
Dissolution.When converter tapping about 1/4, deoxidier first is added to ladle, after abundant deoxidation, adds VN alloy and increases V, increases N.
Cr can dramatically increase the harden ability of steel, to low-alloy steel invigoration effect with higher, improve intensity, the hardness of steel
And wearability, but be inclined to and increase with the increase steel belt roof bolt brittleness of Cr content.Cr content of the present invention is 0.40~1.00%.
The production method of the hot-rolled ribbed high tensile reinforcement steel of of the invention a kind of 700Mpa grades or more, comprising the following steps:
S1, converter or electric-arc furnace steelmaking, and slag-stopping tapping (ladle is flowed into containing the harmful elements such as P, S, such as clinker in slag,
Molten steel is then caused to return P, return S), 1635~1675 DEG C of tapping temperature, in tapping 1/4, alloy is added, the alloy in tapping 3/4
Addition finishes.Converter or electric arc furnaces terminal C >=0.05%, P, S≤0.015%, the addition sequence of alloy be followed successively by deoxidier (for
The oxidational losses of the alloys such as Si, Mn, V is reduced, alloy recovery is improved) → silicomangan → Antaciron → deoxidier → chromium
Iron → VN alloy.
S2, ladle argon-blown gas, argon blowing time >=5min；Make top and the bottom molten steel component in ladle, temperature uniformity, comes
Guarantee uniform, the stability of reinforcement property.
The refining of S3, LF furnace after molten steel enters LF furnace, first uses flow Argon 2 minutes of 250L/min, is then transferred to 95L/
The flow of min continues Argon, and slag former is added, slag making time≤28 minute.
The weak stirring of S4, Argon, mixing time >=15min；Keep molten steel component, temperature further uniform.
S5, billet continuous casting, continuous casting process is using whole process protection casting (preventing molten steel secondary oxidation, form field trash)；In
Between packet superheat of liquid steel≤30 DEG C, secondary cooling zone carries out weak cold, slab straightening temperature >=950 DEG C, 150 billet continuous castings, and continuous casting is whole
Protective casting, work 2.50~3.00m/min of pulling rate, 90~120m3/h of crystallizer water flow；Secondary cooling specific water 0.4~
0.8L/kg。
S6, bar mill low temperature controlled rolling.Bar mill uses low temperature temperature-controlled rolling technique, being capable of energy conservation, saving alloy use
Amount, and growing up for austenite grain is controlled, control the size of crystal grain.
Bar mill low temperature controlled rolling specifically includes the following steps:
Step 1: heating, temperature range is at 1050~1150 DEG C；
Step 2: starting to roll, start rolling temperature range is at 920~970 DEG C；
Step 3: finish rolling, final rolling temperature range is at 800~850 DEG C；
Step 4: upper cold bed, temperature on cooling table range is 700~850 DEG C.
Milling train of the invention has 18 framves, wherein 1~6 frame is roughing mills, 7~12 framves are intermediate mill, and 13~18 framves are
Mm finishing mill unit is alternately arranged using flat~vertical.1,2 frame power of motor 650KW of the invention, 3~6 frame 1050KW, 7~12 framves
1100KW, 13~18 frame 1300KW.
General 1050~1100 DEG C of the start rolling temperature of pair rolling technique, due to the deformation heat of mm finishing mill unit rolled piece, friction
The heat dissipation of a little higher than rolled piece of heat, therefore finishing temperature is generally substantially suitable with start rolling temperature.
Roll 920~970 DEG C of start rolling temperature of the present invention, motor load percentage≤70%.To realize 800~850
Finish rolling within the temperature range of DEG C is provided with cooling section between intermediate mill and mm finishing mill unit and replys section, and cooling section makes temperature
It is reduced within the scope of 800~850 DEG C of requirement, replying section makes rolled piece section temperature reach unanimity, caused by avoiding because of temperature unevenness
The fluctuation of performance.Low temperature temperature-controlled rolling technique make reinforcing bar fine microstructures, uniformly, to obtain good comprehensive mechanical property.
Compared with pair rolling technique, low temperature temperature-controlled rolling technique can make reinforced steel bar strength mention about high 100~150Mpa, and prolong
Performance is stretched not to be substantially reduced.
Embodiment 1
The hot-rolled ribbed high tensile reinforcement of a kind of 700Mpa grades or more of the present embodiment is formed with its chemical analysis of steel and quality hundred
Divide and compare content are as follows: C:0.20~0.30%, Si:0.80~1.20%, Mn:1.30~1.50%, V:0.10~0.20%, N:
0.015~0.025%, Cr:0.40~0.60%, P :≤0.025%, S :≤0.010%, remaining for Fe and inevitably it is miscellaneous
Prime element.
Its corresponding embodiment main chemical composition and mass percentage content are as shown in table 1:
The melting chemical composition of 1 embodiment 1 of table
The production method of the hot-rolled ribbed high tensile reinforcement steel of a kind of 700Mpa grades or more of the present embodiment, including following step
It is rapid:
S1, converter or electric-arc furnace steelmaking, and slag-stopping tapping (ladle is flowed into containing the harmful elements such as P, S, such as clinker in slag,
Molten steel is then caused to return P, return S), 1635~1675 DEG C of tapping temperature, in tapping 1/4, alloy is added, the alloy in tapping 3/4
Addition finishes.Converter or electric arc furnaces terminal C >=0.05%, P, S≤0.015%, the addition sequence of alloy be followed successively by deoxidier (for
The oxidational losses of the alloys such as Si, Mn, V is reduced, alloy recovery is improved) → silicomangan → Antaciron → deoxidier → chromium
Iron → VN alloy.
S2, ladle argon-blown gas, argon blowing time >=5min；Make top and the bottom molten steel component in ladle, temperature uniformity, comes
Guarantee uniform, the stability of reinforcement property.
The refining of S3, LF furnace after molten steel enters LF furnace, first uses flow Argon 2 minutes of 250L/min, is then transferred to 95L/
The flow of min continues Argon, and slag former is added, slag making time≤28 minute.
The weak stirring of S4, Argon, mixing time >=15min；Keep molten steel component, temperature further uniform.
S5, billet continuous casting, continuous casting process is using whole process protection casting (preventing molten steel secondary oxidation, form field trash)；In
Between packet superheat of liquid steel≤30 DEG C, secondary cooling zone carries out weak cold, slab straightening temperature >=950 DEG C, 150 billet continuous castings, and continuous casting is whole
Protective casting, work 2.50~3.00m/min of pulling rate, 90~120m3/h of crystallizer water flow；Secondary cooling specific water 0.4~
0.8L/kg。
S6, bar mill low temperature controlled rolling.Bar mill uses low temperature temperature-controlled rolling technique, being capable of energy conservation, saving alloy use
Amount, and growing up for austenite grain is controlled, control the size of crystal grain.
Bar mill low temperature controlled rolling specifically includes the following steps:
Step 1: heating, temperature range is at 1050~1150 DEG C；
Step 2: starting to roll, start rolling temperature range is at 920~970 DEG C；
Step 3: finish rolling, final rolling temperature range is at 800~850 DEG C；
Step 4: upper cold bed, temperature on cooling table range is 800~850 DEG C.
It makes steel related process parameters such as table 2:
The process for making major parameter of 2 embodiment 1 of table
Its rolling related process parameters such as table 3,800~850 DEG C of temperature on cooling table:
The low temperature temperature-controlled rolling technological parameter of the corresponding embodiment of 3 embodiment of table 1
Under prior art equipment condition, using above-mentioned chemical component, and process for making, bar low temperature temperature-controlled rolling are combined
Technique, the 700Mpa grade hot rolled ribbed bars tissue of production, performance are stablized, yield strength >=700Mpa, and tensile strength >=
875Mpa, elongation after fracture >=14%, percentage of total elongation >=7.5% under maximum, force, the reinforcing bar of the present embodiment metallographic having the same
Tissue 12 grades of grain size, has good fatigue performance as shown in Fig. 2, metallographic structure is ferrite+pearlite.It is suitble to big
Technical scale production, remarkable benefit.
Its corresponding mechanical property of the reinforcing bar of embodiment 1-1 to embodiment 1-16 such as table 4:
The mechanical property of the corresponding embodiment of 4 embodiment of table 1
Wherein: ReLFor yield strength；RmFor tensile strength；A is elongation after fracture；AgtFor breaking elongation under maximum, force.
In above-described embodiment, embodiment 1-1 to embodiment 1-15 is the composition and correlation of the concrete-steel of the present embodiment
Manufacturing parameter, embodiment 1-16 as a comparison case, remove V, and using conventional rolling mill practice, in pair rolling temperature on composition
It is rolled under degree, specific mechanical property is as shown in table 4, its yield strength of the reinforcing bar of embodiment 1-1 to embodiment 1-15
It is all larger than 730Mpa, and the yield strength of embodiment 1-16 is 395Mpa, differs excessively, is unfavorable for the reinforced steel bar strength of the application
Improve building security performance, be unfavorable for using.
Embodiment 2
The hot-rolled ribbed high tensile reinforcement of a kind of 700Mpa grades or more of the present embodiment is formed with its chemical analysis of steel and quality hundred
Divide and compare content are as follows: C:0.30~0.40%, Si:0.80~1.20%, Mn:1.00~1.20%, V:0.15~0.25%, N:
0.015~0.025%, Cr:0.80~1.00%, P :≤0.020%, S :≤0.010%, remaining for Fe and inevitably it is miscellaneous
Prime element.
Its corresponding embodiment main chemical composition and mass percentage content are as shown in table 5:
The melting chemical composition of 5 embodiment 2 of table
The production method of the hot-rolled ribbed high tensile reinforcement steel of a kind of 700Mpa grades or more of the present embodiment, including following step
It is rapid:
S1, converter or electric-arc furnace steelmaking, and slag-stopping tapping (ladle is flowed into containing the harmful elements such as P, S, such as clinker in slag,
Molten steel is then caused to return P, return S), 1635~1675 DEG C of tapping temperature, in tapping 1/4, alloy is added, the alloy in tapping 3/4
Addition finishes.Converter or electric arc furnaces terminal C >=0.05%, P, S≤0.015%, the addition sequence of alloy be followed successively by deoxidier (for
The oxidational losses of the alloys such as Si, Mn, V is reduced, alloy recovery is improved) → silicomangan → Antaciron → deoxidier → chromium
Iron → VN alloy.
S2, ladle argon-blown gas, argon blowing time >=5min；Make top and the bottom molten steel component in ladle, temperature uniformity, comes
Guarantee uniform, the stability of reinforcement property.
The refining of S3, LF furnace after molten steel enters LF furnace, first uses flow Argon 2 minutes of 250L/min, is then transferred to 95L/
The flow of min continues Argon, and slag former is added, slag making time≤28 minute.
The weak stirring of S4, Argon, mixing time >=15min；Keep molten steel component, temperature further uniform.
S5, billet continuous casting, continuous casting process is using whole process protection casting (preventing molten steel secondary oxidation, form field trash)；In
Between packet superheat of liquid steel≤30 DEG C, secondary cooling zone carries out weak cold, slab straightening temperature >=950 DEG C, 150 billet continuous castings, and continuous casting is whole
Protective casting, work 2.50~3.00m/min of pulling rate, 90~120m3/h of crystallizer water flow；Secondary cooling specific water 0.4~
0.8L/kg。
S6, bar mill low temperature controlled rolling.Bar mill uses low temperature temperature-controlled rolling technique, being capable of energy conservation, saving alloy use
Amount, and growing up for austenite grain is controlled, control the size of crystal grain.
Bar mill low temperature controlled rolling specifically includes the following steps:
Step 1: heating, temperature range is at 1050~1150 DEG C；
Step 2: starting to roll, start rolling temperature range is at 920~970 DEG C；
Step 3: finish rolling, final rolling temperature range is at 750~800 DEG C；
Step 4: upper cold bed, temperature on cooling table range is 800~850 DEG C.
It makes steel related process parameters such as table 6:
The process for making major parameter of 6 embodiment 2 of table
Its rolling related process parameters such as table 7,750~800 DEG C of temperature on cooling table:
The low temperature temperature-controlled rolling technological parameter of the corresponding embodiment of 7 embodiment of table 2
It is designed using the ingredient of V microalloying, and process for making, rod material rolling process is combined to produce 730Mpa grades of hot rollings
High tensile reinforcement with ribbing, yield strength >=730Mpa, tensile strength >=915Mpa, elongation after fracture >=14% are total under maximum, force
Elongation >=7.5%.As shown in figure 3, the reinforcing bar of the present embodiment, surface is bainite structure, and key technology is to provide one kind
730Mpa grades of hot-rolled strips carry out the design of alloy and process for making, press quenching heat treatment process of high tensile reinforcement, big to realize
Technical scale production.
Its corresponding mechanical property of the reinforcing bar of embodiment 2-1 to embodiment 2-16 such as table 8:
The mechanical property of the corresponding embodiment of 8 embodiment of table 2
Wherein: ReLFor yield strength；RmFor tensile strength；A is elongation after fracture；AgtFor breaking elongation under maximum, force.
In above-described embodiment, embodiment 2-1 to embodiment 2-15 is the composition and correlation of the concrete-steel of the present embodiment
Manufacturing parameter, embodiment 2-16 as a comparison case, remove V, and using conventional rolling mill practice, in pair rolling temperature on composition
It is rolled under degree, specific mechanical property is as shown in table 4, its yield strength of the reinforcing bar of embodiment 2-1 to embodiment 2-15
It is all larger than 750Mpa, and the yield strength of embodiment 2-16 is 390Mpa, differs excessively, is unfavorable for the reinforced steel bar strength of the application
Improve building security performance, be unfavorable for using.
Embodiment 3
The hot-rolled ribbed high tensile reinforcement of a kind of 700Mpa grades or more of the present embodiment is formed with its chemical analysis of steel and quality hundred
Divide and compare content are as follows: C:0.40~0.50%, Si:0.80~1.20%, Mn:1.00~1.20%, V:0.15~0.25%, N:
0.015~0.025%, Cr:0.80~1.00%, P :≤0.020%, S :≤0.010%, remaining for Fe and inevitably it is miscellaneous
Prime element.
Its corresponding embodiment main chemical composition and mass percentage content are as shown in table 9:
The melting chemical composition of 9 embodiment 3 of table
The production method of the hot-rolled ribbed high tensile reinforcement steel of a kind of 700Mpa grades or more of the present embodiment, including following step
It is rapid:
S1, converter or electric-arc furnace steelmaking, and slag-stopping tapping (ladle is flowed into containing the harmful elements such as P, S, such as clinker in slag,
Molten steel is then caused to return P, return S), 1635~1675 DEG C of tapping temperature, in tapping 1/4, alloy is added, the alloy in tapping 3/4
Addition finishes.Converter or electric arc furnaces terminal C >=0.05%, P, S≤0.015%, the addition sequence of alloy be followed successively by deoxidier (for
The oxidational losses of the alloys such as Si, Mn, V is reduced, alloy recovery is improved) → silicomangan → Antaciron → deoxidier → chromium
Iron → VN alloy.
S2, ladle argon-blown gas, argon blowing time >=5min；Make top and the bottom molten steel component in ladle, temperature uniformity, comes
Guarantee uniform, the stability of reinforcement property.
The refining of S3, LF furnace after molten steel enters LF furnace, first uses flow Argon 2 minutes of 250L/min, is then transferred to 95L/
The flow of min continues Argon, and slag former is added, slag making time≤28 minute.
The weak stirring of S4, Argon, mixing time >=15min；Keep molten steel component, temperature further uniform.
S5, billet continuous casting, continuous casting process is using whole process protection casting (preventing molten steel secondary oxidation, form field trash)；In
Between packet superheat of liquid steel≤30 DEG C, secondary cooling zone carries out weak cold, slab straightening temperature >=950 DEG C, 150 billet continuous castings, and continuous casting is whole
Protective casting, work 2.50~3.00m/min of pulling rate, 90~120m3/h of crystallizer water flow；Secondary cooling specific water 0.4~
0.8L/kg。
S6, bar mill low temperature controlled rolling.Bar mill uses low temperature temperature-controlled rolling technique, being capable of energy conservation, saving alloy use
Amount, and growing up for austenite grain is controlled, control the size of crystal grain.
Bar mill low temperature controlled rolling specifically includes the following steps:
Step 1: heating, temperature range is at 1050~1150 DEG C；
Step 2: starting to roll, start rolling temperature range is at 920~970 DEG C；
Step 3: finish rolling, final rolling temperature range is at 800~850 DEG C；
Step 4: upper cold bed, temperature on cooling table range is 700~750 DEG C.
It makes steel related process parameters such as table 10:
The process for making major parameter of 10 embodiment 3 of table
Its rolling related process parameters such as table 11,750~800 DEG C of temperature on cooling table:
The low temperature temperature-controlled rolling technological parameter of the corresponding embodiment of 11 embodiment of table 3
It is designed using V by the ingredient of microalloying, and process for making, bar Heat Treatment technique is combined to produce
800Mpa grades of hot-rolled ribbed high tensile reinforcements, yield strength >=800Mpa, tensile strength >=950Mpa, elongation after fracture >=
14%, percentage of total elongation >=7.5% under maximum, force.As shown in figure 3, the reinforcing bar of the present embodiment, surface is tempered sorbite,
The key technology of solution is to provide a kind of 800Mpa grades of hot-rolled strip and carrys out the design of alloy of high tensile reinforcement and process for making, online
Heat Treatment technique, to realize large-scale industrial production.
Its corresponding mechanical property of the reinforcing bar of embodiment 3-1 to embodiment 3-16 such as table 12:
The mechanical property of the corresponding embodiment of 12 embodiment of table 3
Wherein: ReLFor yield strength；RmFor tensile strength；A is elongation after fracture；AgtFor breaking elongation under maximum, force.
In above-described embodiment, embodiment 3-1 to embodiment 3-15 is the composition and correlation of the concrete-steel of the present embodiment
Manufacturing parameter, embodiment 3-16 as a comparison case, remove V, and using conventional rolling mill practice, in pair rolling temperature on composition
It is rolled under degree, specific mechanical property is as shown in table 4, its yield strength of the reinforcing bar of embodiment 3-1 to embodiment 3-15
It is all larger than 810Mpa, and the yield strength of embodiment 1-16 is 395Mpa, differs excessively, is unfavorable for the reinforced steel bar strength of the application
Improve building security performance, be unfavorable for using.
Claims (10)
1. a kind of 700Mpa grades or more hot-rolled ribbed high tensile reinforcement steel, which is characterized in that its chemical analysis composition and quality hundred
Divide and compare content are as follows: C:0.20~0.50%, Si:0.80~1.20%, Mn:1.00~1.50%, V:0.10~0.25%, N:
0.015~0.025%, Cr:0.40~1.00%, P :≤0.025%, S :≤0.010%, remaining for Fe and inevitably it is miscellaneous
Prime element.
2. a kind of 700Mpa grades according to claim 1 or more hot-rolled ribbed high tensile reinforcement steel, which is characterized in that it is changed
Study part composition and mass percentage content are as follows: C:0.20~0.30%, Si:0.80~1.20%, Mn:1.30~1.50%,
V:0.10~0.20%, N:0.015~0.025%, Cr:0.40~0.60%, P :≤0.025%, S :≤0.010%, remaining
For Fe and inevitable impurity element.
3. a kind of 700Mpa grades according to claim 1 or more hot-rolled ribbed high tensile reinforcement steel, which is characterized in that it is changed
Study part composition and mass percentage content are as follows: C:0.30~0.40%, Si:0.80~1.20%, Mn:1.00~1.20%,
V:0.15~0.25%, N:0.015~0.025%, Cr:0.80~1.00%, P :≤0.020%, S :≤0.010%, remaining
For Fe and inevitable impurity element.
4. a kind of 700Mpa grades according to claim 1 or more hot-rolled ribbed high tensile reinforcement steel, which is characterized in that it is changed
Study part composition and mass percentage content are as follows: C:0.40~0.50%, Si:0.80~1.20%, Mn:1.00~1.20%,
V:0.15~0.25%, N:0.015~0.025%, Cr:0.80~1.00%, P :≤0.020%, S :≤0.010%, remaining
For Fe and inevitable impurity element.
5. the production method of a kind of 700Mpa grades or more hot-rolled ribbed high tensile reinforcement steel, which comprises the following steps:
1635~1675 DEG C of tapping temperature, in tapping 1/4, alloy is added in S1, converter or electric-arc furnace steelmaking, and slag-stopping tapping,
In tapping 3/4, alloy addition is finished；
S2, ladle argon-blown gas, argon blowing time >=5min；
The refining of S3, LF furnace, is passed through argon gas to LF furnace, and slag former is added；
The weak stirring of S4, Argon, mixing time >=15min；
S5, billet continuous casting, continuous casting process are cast using whole process protection；
S6, bar mill low temperature controlled rolling.
6. the production method of a kind of 700Mpa grades according to claim 5 or more hot-rolled ribbed high tensile reinforcement steel, special
Sign is that converter or electric arc furnaces terminal C >=0.05%, P, S≤0.015% in the step S1, the addition sequence of alloy is successively
For deoxidier → silicomangan → Antaciron → deoxidier → ferrochrome → VN alloy.
7. the production method of a kind of 700Mpa grades according to claim 5 or more hot-rolled ribbed high tensile reinforcement steel, special
Sign is, after molten steel enters LF furnace in the step S3, first uses flow Argon 2 minutes of 250L/min, is then transferred to 95L/
The flow of min continues Argon, slag making time≤28 minute.
8. the production method of a kind of 700Mpa grades according to claim 5 or more hot-rolled ribbed high tensile reinforcement steel, special
Sign is that the tundish molten steel degree of superheat≤30 DEG C in whole process protection casting, secondary cooling zone carry out weak cold in the step S5, and slab is drawn
Rectify temperature >=950 DEG C.
9. the production method of a kind of 700Mpa grades according to claim 7 or more hot-rolled ribbed high tensile reinforcement steel, special
Sign is that the Casting speed is 2.50~3.00m/min, 90~120m of crystallizer water flow3/h；Secondary cooling specific water
0.4~0.8L/kg.
10. the production method of a kind of 700Mpa grades according to claim 5 or more hot-rolled ribbed high tensile reinforcement steel, special
Sign is, bar mill low temperature controlled rolling in the step S6 specifically includes the following steps:
Step 1: heating, temperature range is at 1050~1150 DEG C；
Step 2: starting to roll, start rolling temperature range is at 920~970 DEG C；
Step 3: finish rolling, final rolling temperature range is at 800~850 DEG C；
Step 4: upper cold bed, temperature on cooling table range is 700~850 DEG C.
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