CN109355565A - A kind of Nb-microalloying HRB400E hot rolling anti-seismic steel bar and its production method - Google Patents
A kind of Nb-microalloying HRB400E hot rolling anti-seismic steel bar and its production method Download PDFInfo
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- CN109355565A CN109355565A CN201811364876.9A CN201811364876A CN109355565A CN 109355565 A CN109355565 A CN 109355565A CN 201811364876 A CN201811364876 A CN 201811364876A CN 109355565 A CN109355565 A CN 109355565A
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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
- 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
- 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
Abstract
The present invention provides a kind of Nb-microalloying HRB400E hot rolling anti-seismic steel bar, chemical components are as follows: C:0.20-0.25%, Si:0.40-0.60%, Mn:1.25-1.54%, Nb:0.025-0.040%, Ceq:0.45-0.52%, remaining is Fe and impurity.Its production method are as follows: successively by smeltings, continuous casting, heating, roughing, in roll, finish rolling, for ruler shearing, cold bed natural cooling, cutting to length, secondary natural cooling, collecting packing.This method is hot-rolling method, and production method and technical target of the product are different from cold rolled reinforcing bar.The present invention is quickly cooled down without cooling during rolling or after rolling, the advantages of reducing equipment investment, and hot-rolled reinforced bar is kept not allow easy-to-rust, obtains at low cost, the stable products such as mechanical performance index, process performance index, antidetonation index improve Nb-microalloying anti-seismic steel bar stability problem.
Description
Technical field
The invention belongs to hot-strip preparation technical fields, and in particular to a kind of Nb-microalloying HRB400E hot rolling antidetonation
Reinforcing bar and its production method.
Background technique
HRB400E hot rolling anti-seismic steel bar is a kind of high-intensitive Ribbed Bar with earthquake resisting performance, is widely used in all kinds of
The reinforced concrete structure of building.Microalloying is generally carried out using vanadium, reaches the performance indexes of requirement, also has
Producer and the technique of Nb-microalloying are explored, but often stability is bad.For this purpose, both at home and abroad to Nb-microalloying steel
Muscle has carried out more research, and majority uses the combined microalloying thinking that niobium vanadium is compound or niobium titanium is compound and ingredient design,
And in hot rolling and (or) rolling after usually carry out cooling during rolling or roll after be quickly cooled down (water cooling), first is that need it is mating
Cooling equipment, second is that after rolling be quickly cooled down can destroy hot rolling formed iron sheet compact texture, cause reinforcing bar be easy corrosion.Also have
Reinforcing bar is prepared using cold-rolling process, cold rolling process is different from hot-rolling method, and the two technical target of the product and production method have pole
Big difference, hot rolling technology do not have processing hardening, and plasticity index is more outstanding, therefore earthquake-resistant structure more applies HRB400E hot
Roll anti-seismic steel bar.HRB400E hot rolling anti-seismic steel bar is included in GB/T1499.2 " concrete reinforcement steel part 2: hot-rolled strip rib steel
Muscle ".
Summary of the invention
In view of this, the present invention provides a kind of Nb-microalloying HRB400E hot rolling anti-seismic steel bar and its production method, this
Invention solves Nb-microalloying to reduce equipment investment without being quickly cooled down (water cooling) after carrying out cooling during rolling or rolling
The bad problem of reinforcement property stability, while also solving the problems, such as that reinforcing bar is easy corrosion.
First aspect present invention provides the chemical component of the Nb-microalloying HRB400E hot rolling anti-seismic steel bar are as follows: with
Weight percent meter, C:0.20-0.25%, Si:0.40-0.60%, Mn:1.25-1.54%, Nb:0.025-0.040%,
Ceq:0.45-0.52%, remaining is Fe and inevitable impurity.
Preferably, the chemical component of the Nb-microalloying HRB400E anti-seismic steel bar are as follows: by weight percentage, C:
0.23-0.25%, Si:0.40-0.50%, Mn:1.25-1.38%, Nb:0.025-0.033%, Ceq:0.45-0.50%,
Remaining is Fe and inevitable impurity.
More preferred, the chemical component of the Nb-microalloying HRB400E hot rolling anti-seismic steel bar are as follows: with weight percent
Meter, C:0.23-0.245%, Si:0.40-0.50%, Mn:1.25-1.33%, Nb:0.025-0.030%, Ceq:0.45-
0.49%, remaining is Fe and inevitable impurity.
C is added as important intensified element, primarily serves solution strengthening effect, in addition in cooling procedure C element with
Nb element combines and forms precipitate, further increases intensity.C is cheap intensified element, but it reduces welding performance again, is simultaneous
C element content is designed as 0.20-0.25% by Gu Erzhe.
Si is deoxidant element, and solution strengthening effect is played in steel, and to improving, yield strength is advantageous, but influences weldability
Can, Si control of element is 0.40-0.50% in 0.40-0.60%, more preferably value.
Mn is added as intensified element, and Mn element is displacement solution strengthening element, and Mn element is limited to 1.25-
1.54%, more preferably value is 1.25-1.38%, and best preferred value is 1.25-1.33%, excessively high to lead to increased costs, too low
So that intensity is insufficient.
Nb is added as important micro alloying element, there is good crystal grain refinement, precipitation strength effect, raw in reinforcing bar
Grain Refinement Effect is mainly the Pinning of niobium and the effect of dragging of solute atoms in production, prevents heating process and recrystallized
The crystal grain of journey is grown up, and is precipitated in the operation of rolling and after rolling with compound form, is further increased intensity.Nb content adds with steel billet
Hot temperature has important association, is also associated with rolling temperature and cooling velocity, is controlled Nb content in 0.025- according to process conditions
0.040%, more preferably value is 0.025-0.033%, and best preferred value is 0.025-0.030%.
Second aspect of the present invention provides the production method of above-mentioned Nb-microalloying HRB400E hot rolling anti-seismic steel bar, step
Include:
S1, converter smelting, continuous casting obtain slab, the chemical component of the slab and above-mentioned Nb-microalloying HRB400E heat
The chemical component for rolling anti-seismic steel bar is consistent；
S2, the slab is heated, then successively by roughing, in roll, finish rolling, through cold shears fixed size scissors after natural cooling
It cuts, collecting packing obtains product after secondary natural cooling.
The above method is quickly cooled down, common bar unit is complete in rolling and after rolling without cooling during rolling and after rolling
Meet appointed condition, without increasing equipment investment, especially without process is quickly cooled down after rolling, maintains the iron scale of hot rolling densification
Structure slows down the corrosion of reinforcing bar.
Preferably, continuous casting process step described in step S1 includes: 15-25 DEG C of the molten steel in bakie in continuous casting degree of superheat, 160 ×
160 square casting blanks pulling rate 2.2-2.4m/min, Water Rate for Secondary Cooling Water 1.6-1.8L/kg, continuous casting billet straightening temperature >=1000 DEG C.The micro- conjunction of niobium
Golden steel continuous casting billet has crack sensitivity, and straightening temperature drops the thermoplasticity of steel significantly in the precipitation of 950 DEG C or less Nb (CN)
It is low.The research emphasis of control crackle is to optimize continuous casting cooling technique, guarantees straightening temperature, avoid rectifying in crack-sensitivity area
Directly.By the matching of 15-25 DEG C of the molten steel in bakie in continuous casting degree of superheat and 160 × 160 square casting blanks pulling rate 2.2-2.4m/min, two is cold
Specific water uses 1.6-1.8L/kg, and straightening temperature >=1000 DEG C efficiently solve the problems, such as slab crack defect.
Preferably, the heating temperature of heating process described in step S2 is 1100-1180 DEG C, and heating time is 60-110 points
Clock, start rolling temperature are 1060-1100 DEG C.The slab is heated, specific heating temperature and time are chosen, is dissolved big portion
Dividing Nb is to strengthen matrix to prepare, and retains a certain amount of Nb (C, N) and plays Pinning effect, prevents the austenite of heating process
Grain coarsening；It is rolled again, determines start rolling temperature, rolled by roughing mills, intermediate mill, mm finishing mill unit, rolled
In the process, the Nb (C, N) of the reservation and a small amount of Nb (C, N) being precipitated again prevents recrystallization from growing up, and generated with the operation of rolling
Dislocation, tissue aberrations interaction, fining austenite grains simultaneously increase significantly ferrite nucleation point, further fining ferrite
Crystal grain.
Preferably, roughing described in step S2 be the roughing of 5-7 passage, it is described in roll to be rolled in 3-4 passage, the finish rolling be 4-
10 passage finish rolling.
Preferably, in step S2, the natural cooling is the natural cooling on cold bed, and the temperature of steel is 950- when upper cold bed
1050 DEG C, cooler environment temperature is 0-50 DEG C.It carries out standby ruler after the completion of rolling to shear, cold bed is natural in 950-1050 DEG C of temperature
It is cooling, using natural cooling, it ensure that Nb (C, N) has the enough precipitation time, Nb made to have given full play to precipitation strength effect
Preferably, in step S2, the product specification is Φ 12mm- Φ 22mm.
Preferably, in step S2, the steel after the cutting to length is placed on the transport road Kun and transports, and enterprising in the transport road Kun
The row secondary natural cooling.
Compared with the prior art, the advantages of the present invention are as follows:
(1) ingredient of the invention design cooperates a certain range of slab heating and rolling temperature, has given full play to niobium element
Crystal grain refinement, delay recrystallization, precipitation strength effect.
(2) present invention is not necessarily to excessively high heating temperature, is quickly cooled down without cooling during rolling and after rolling, and remains fine and close heat
It rolls scale structure reinforcing bar to be not easy to corrode, and reduces HRB400E hot rolling anti-seismic steel bar production cost.
(3) mechanical property for the HRB400E hot rolling anti-seismic steel bar product that the present invention is prepared, process performance index are complete
Meet national standard " 1499.2 concrete reinforcement steel part 2 hot rolled ribbed bars of GB/T " requirement and mechanical property steady
Fluctuation, has good application prospect in fixed close limit.
Detailed description of the invention
Attached drawing 1 is the process flow chart of Nb-microalloying HRB400E hot rolling anti-seismic steel bar production method of the present invention.
Attached drawing 2 is the process flow chart for implementing Nb-microalloying HRB400E hot rolling anti-seismic steel bar production method in 1
Specific embodiment
To facilitate the understanding of the present invention, present invention work more comprehensively, is meticulously described below in conjunction with embodiment, but this hair
Bright protection scope is not limited to embodiment in detail below.
Unless otherwise defined, all technical terms used hereinafter and the normally understood meaning of those skilled in the art
It is identical.Technical term used herein is intended merely to the purpose of description specific embodiment, is not intended to the limitation present invention
Protection scope.
Unless otherwise specified, various raw material, reagent, the instrument and equipment etc. used in the present invention, can pass through
Market is commercially available or can be prepared by existing method.
First aspect present invention provides the chemical component of the Nb-microalloying HRB400E hot rolling anti-seismic steel bar are as follows: with
Weight percent meter, C:0.20-0.25%, Si:0.40-0.60%, Mn:1.25-1.54%, Nb:0.025-0.040%,
Ceq:0.45-0.52%, remaining is Fe and inevitable impurity.The Nb-microalloying as a preferred method,
The chemical component of HRB400E hot rolling anti-seismic steel bar are as follows: by weight percentage, C:0.23-0.25%, Si:0.40-0.50%,
Mn:1.25-1.38%, Nb:0.025-0.033%, Ceq:0.45-0.50%, remaining is Fe and inevitable impurity.As
More preferred mode, the chemical component of the Nb-microalloying HRB400E hot rolling anti-seismic steel bar are as follows: by weight percentage,
C:0.23-0.245%, Si:0.40-0.50%, Mn:1.25-1.33%, Nb:0.025-0.030%, Ceq:0.45-
0.49%, remaining is Fe and inevitable impurity.
The present invention is that control cost takes into account welding performance, and C element content presses national standard " 1499.2 reinforced concrete of GB/T
Soil use steel part 2 hot rolled ribbed bars " allow upper design limit；Si, Mn constituent content are lower than the above-mentioned standard upper limit, but examine
Consider its invigoration effect, provides range appropriate；Nb constituent content take into account consider heating furnace ability, fuel consumption, strengthening mechanism with
And subsequent technique takes into account cost control to ensure based on the stability of performance.
Second aspect of the present invention provides the production method of above-mentioned Nb-microalloying HRB400E hot rolling anti-seismic steel bar, step
Include:
Step 1, converter smelting is carried out, continuous casting obtains slab.15-25 DEG C of the molten steel in bakie in continuous casting degree of superheat, 160 × 160
Square casting blanks pulling rate 2.2-2.4m/min, Water Rate for Secondary Cooling Water use 1.6-1.8L/kg, straightening temperature >=1000 DEG C.
Step 2, the chemical component mass percent of the slab are as follows: C:0.20-0.25%, Si:0.40-0.60%, Mn:
1.25-1.54%, Nb:0.025-0.040%, Ceq:0.45-0.52%, remaining is Fe and impurity.
Step 3, the slab is heated, the heating temperature of the heating process is 1100-1180 DEG C, heating time
It is 60-110 minutes, start rolling temperature is 1060-1100 DEG C.The main purpose of the step is that temperature required for reaching rolling subtracts
Few mill load will also reach the Physical Metallurgy condition that the solid solution of the part Nb has Pinning and precipitation strength, obtain stable
Properties of product, while also not increasing considerably heating furnace load, not influence of rolled rhythm.
Step 4, the slab after heating is heated, by roughing, in roll, finish rolling, the roughing be 5-7 passage it is thick
It rolls, middle prick is to prick in 3-4 passage, and the finish rolling is the finish rolling of 4-10 passage, then carries out standby ruler and shears, during which without carrying out
It cooling during rolling and is quickly cooled down after rolling.Common bar unit fully meets appointed condition, without increasing water cooling plant, reduces equipment
Investment, especially without process is quickly cooled down after rolling, maintains the scale structure of hot rolling densification, slows down the corrosion of reinforcing bar.
Step 5, cold bed natural cooling on the slab after rolling, the temperature of steel is 950-1050 DEG C when upper cold bed, environment temperature
0-50 DEG C of degree, obtains specification and is through secondary natural cooling, collecting packing on cold shears cutting to length, conveyor roller (conveyer chain)
The HRB400E hot rolling anti-seismic steel bar product of Φ 12mm- Φ 22mm, final products are at low cost, mechanical property and processing performance are stable,
With good antidetonation index.
Since niobium micro-alloy steel continuous casting billet has crack sensitivity, continuous casting process is optimized by the above method, is effectively solved
Slab crack defect problem.
Slab is heated, heating temperature is 1100-1180 DEG C, and heating time is 60-110 minutes, and start rolling temperature is
1060-1100 DEG C, so that slab is had rolling required temperature condition reduces mill load, and heating temperature reaches most of Nb solid solution simultaneously
Retain a certain amount of Nb (C, N), while not increasing considerably heating furnace load, not influence of rolled rhythm；Slab passes through roughing mill
Group, intermediate mill, mm finishing mill unit rolling, process are in Controlled Cooling temperature region, the Nb (C, N) of reservation and are precipitated again
A small amount of Nb (C, N) prevent recrystallization grow up, and with the operation of rolling generate dislocation, tissue aberrations interact, refine austenite
Crystal grain simultaneously increases significantly ferrite nucleation point, further fining ferrite grains；Standby ruler is carried out after rolling to shear, and can be gone up cold
Bed natural cooling, ensure that Nb (C, N) has the enough precipitation time, give full play to Nb precipitation strength effect；In rolling and roll
It after system, is quickly cooled down without cooling during rolling and after rolling, common bar unit fully meets appointed condition, throws without increasing equipment
Money maintains the iron sheet structure of hot rolling densification, slows down the corrosion of reinforcing bar especially without the process of rapid cooling.It is natural on cold bed
HRB400E hot rolling is obtained through secondary natural cooling, collecting packing on cold shears cutting to length, conveyor roller (conveyer chain) after cooling to resist
Shake reinforcing bar product.
The method of the invention production HRB400E hot rolling anti-seismic steel bar, lower yield strength (Rel), tensile strength (Rm),
Elongation percentage (A), is bent than (R at maximum, force overall elongation (Agt)0EL/ReL), strong flexor ratio (R0m/R0) etc. eL mechanical performance indexs are complete
Meet national standard " 1499.2 concrete reinforcement steel part 2 hot rolled ribbed bars of GB/T " entirely to require and stable narrow
Fluctuation, the processing performances such as bending property and back-flexing performance are also fully consistent with the standard in range.Have below in conjunction with five
The Nb-microalloying HRB400E hot rolling anti-seismic steel bar and its production method of the application is described in detail in body embodiment.
Embodiment 1
Present embodiments provide a kind of Nb-microalloying HRB400E hot rolling anti-seismic steel bar and its production method.
The production method steps include: that converter smelting, continuous casting obtain slab, molten steel in bakie in continuous casting degree of superheat 15-25
DEG C, 160 × 160 square casting blanks pulling rate 2.2-2.4m/min, Water Rate for Secondary Cooling Water uses 1.6-1.8L/kg, straightening temperature >=1000 DEG C.
Chemical Composition in Cast Billet mass percent are as follows: C:0.242%, Si:0.44%, Mn:1.31%, Nb:0.026%, Ceq:0.47%,
Remaining is Fe and impurity.Then, enable slab by heating, 1154 DEG C of heating temperature, heating time 66 minutes, start rolling temperature 1062
℃.Again successively by 7 passes of roughing, crop end, in roll 4 passes, crop end, 4 passes of finish rolling, standby ruler and cut
It cuts, natural cooling on cold bed, the temperature of steel is 1000 DEG C, 30 DEG C of environment temperature when upper cold bed.Then cutting to length, conveyor roller
(conveyer chain) transport and secondary natural cooling, collecting packing acquisition Φ 22mm specification HRB400E hot rolling anti-seismic steel bar.
The chemical component mass percent of gained HRB400E anti-seismic steel bar are as follows: C:0.242%, Si:0.44%, Mn:
1.31%, Nb:0.026%, Ceq:0.47%, remaining is Fe and impurity, lower yield strength (Rel) 445MPa, tensile strength
(Rm) 635MPa, elongation percentage (A) 29.5%, maximum, force overall elongation (Agt) 15.2%, bend bend than (R0EL/ReL) 1.11, strong to bend
Than (R0m/R0eL)1.43。
Embodiment 2
Present embodiments provide a kind of Nb-microalloying HRB400E hot rolling anti-seismic steel bar and its production method.
The production method steps include: that converter smelting, continuous casting obtain slab, molten steel in bakie in continuous casting degree of superheat 15-25
DEG C, 160 × 160 square casting blanks pulling rate 2.2-2.4m/min, Water Rate for Secondary Cooling Water uses 1.6-1.8L/kg, straightening temperature >=1000 DEG C.
Chemical Composition in Cast Billet mass percent are as follows: C:0.237%, Si:0.46%, Mn:1.31%, Nb:0.027%, Ceq:0.46%,
Remaining is Fe and impurity.Then, enable slab by heating, 1145 DEG C of heating temperature, heating time 78 minutes, start rolling temperature 1073
DEG C, then successively by 7 passes of roughing, crop end, in roll 4 passes, crop end, 6 passes of finish rolling, standby ruler and cut
It cuts, natural cooling on cold bed, the temperature of steel is 1035 DEG C, 42 DEG C of environment temperature when upper cold bed.Then cutting to length, conveyor roller
(conveyer chain) transport and natural cooling, collecting packing acquisition Φ 18mm specification HRB400E hot rolling anti-seismic steel bar.
The chemical component mass percent of gained HRB400E anti-seismic steel bar are as follows: C:0.237%, Si:0.46%, Mn:
1.31%, Nb:0.027%, Ceq:0.46%, remaining is Fe and impurity, lower yield strength (Rel) 430MPa, tensile strength
(Rm) 625MPa, elongation percentage (A) 29.5%, maximum, force overall elongation (Agt) 13.9%, bend bend than (R0EL/ReL) 1.08, strong to bend
Than (R0m/R0eL)1.45。
Embodiment 3
Present embodiments provide a kind of Nb-microalloying HRB400E hot rolling anti-seismic steel bar and its production method.
The production method steps include: that converter smelting, continuous casting obtain slab, molten steel in bakie in continuous casting degree of superheat 15-25
DEG C, 160 × 160 square casting blanks pulling rate 2.2-2.4m/min, Water Rate for Secondary Cooling Water uses 1.6-1.8L/kg, straightening temperature >=1000 DEG C.
Chemical Composition in Cast Billet mass percent are as follows: C:0.226%, Si:0.43%, Mn:1.28%, Nb:0.025%, Ceq:0.45%,
Remaining is Fe and impurity.Then, enable slab by heating, 1160 DEG C of heating temperature, heating time 110 minutes, start rolling temperature
1068℃.Again successively by 5 passes of roughing, crop end, in roll 3 passes, crop end, 10 passes of finish rolling, standby
Ruler shearing, natural cooling on cold bed, the temperature of steel is 980 DEG C, 24 DEG C of environment temperature when upper cold bed.Then cutting to length, transport
Roller-way (conveyer chain) transport and natural cooling, collecting packing acquisition Φ 12mm specification HRB400E hot rolling anti-seismic steel bar.
The chemical component mass percent of gained HRB400E anti-seismic steel bar are as follows: C:0.226%, Si:0.43%, Mn:
1.28%, Nb:0.025%, Ceq:0.45%, remaining is Fe and impurity, lower yield strength (Rel) 465MPa, tensile strength
(Rm) 660MPa, elongation percentage (A) 27.0%, maximum, force overall elongation (Agt) 12.7%, bend bend than (R0EL/ReL) 1.16, strong to bend
Than (R0m/R0eL)1.42。
Embodiment 4
Present embodiments provide a kind of Nb-microalloying HRB400E anti-seismic steel bar and its production method.
The production method steps include: that converter smelting, continuous casting obtain slab, molten steel in bakie in continuous casting degree of superheat 15-25
DEG C, 160 × 160 square casting blanks pulling rate 2.2-2.4m/min, Water Rate for Secondary Cooling Water uses 1.6-1.8L/kg, straightening temperature >=1000 DEG C.
Chemical Composition in Cast Billet mass percent are as follows: C:0.234%, Si:0.45%, Mn:1.30%, Nb:0.026%, Ceq:0.46%,
Remaining is Fe and impurity.Then, enable slab by heating, 1165 DEG C of heating temperature, heating time 100 minutes, start rolling temperature
1070℃.Again successively by 5 passes of roughing, crop end, in roll 3 passes, crop end, 8 passes of finish rolling, standby ruler
Shearing, natural cooling on cold bed, the temperature of steel is 995 DEG C, 15 DEG C of environment temperature when upper cold bed.Then cutting to length, transport roller
Road (conveyer chain) transport and natural cooling, collecting packing acquisition Φ 14mm specification HRB400E hot rolling anti-seismic steel bar.
The chemical component mass percent of gained HRB400E anti-seismic steel bar are as follows: C:0.234%, Si:0.45%, Mn:
1.30%, Nb:0.026%, Ceq:0.46%, remaining is Fe and impurity, lower yield strength (Rel) 471MPa, tensile strength
(Rm) 680MPa, elongation percentage (A) 28.0%, maximum, force overall elongation (Agt) 13.0%, bend bend than (R0EL/ReL) 1.18, strong to bend
Than (R0m/R0eL)1.44。
The HRB400E anti-seismic steel bar of Nb-microalloying provided by the invention, ingredient design cooperate a certain range of slab to add
Heat and rolling temperature play the crystal grain refinement, delay recrystallization, precipitation strength effect of niobium element, it is raw to reduce HRB400E reinforcing bar
Production cost, properties of product stabilization and narrow fluctuation range without cooling during rolling and roll rear fast quickly cooling without excessively high heating temperature
But, reduce water cooling equipment investment, remain fine and close hot rolling iron sheet structure reinforcing bar and be not easy to corrode.
Although preferred embodiments of the present invention have been described, it is created once a person skilled in the art knows basic
Property concept, then additional changes and modifications may be made to these embodiments.So it includes excellent that the following claims are intended to be interpreted as
It selects embodiment and falls into all change and modification of the scope of the invention.
Obviously, various changes and modifications can be made to the invention without departing from essence of the invention by those skilled in the art
Mind and range.In this way, if these modifications and changes of the present invention belongs to the range of the claims in the present invention and its equivalent technologies
Within, then the present invention is also intended to include these modifications and variations.
Claims (10)
1. a kind of Nb-microalloying HRB400E hot rolling anti-seismic steel bar, it is characterised in that: the Nb-microalloying HRB400E hot rolling
The chemical component of anti-seismic steel bar are as follows: by weight percentage, C:0.20-0.25%, Si:0.40-0.60%, Mn:1.25-
1.54%, Nb:0.025-0.040%, Ceq:0.45-0.52%, remaining is Fe and inevitable impurity.
2. hot rolled niobium micro-alloyed HRB400E anti-seismic steel bar as described in claim 1, it is characterised in that: the niobium micro-alloy
Change the chemical component of HRB400E hot rolling anti-seismic steel bar are as follows: by weight percentage, C:0.23-0.25%, Si:0.40-
0.50%, Mn:1.25-1.38%, Nb:0.025-0.033%, Ceq:0.45-0.50%, remaining for Fe and inevitably it is miscellaneous
Matter.
3. Nb-microalloying HRB400E hot rolling anti-seismic steel bar as claimed in claim 2, it is characterised in that: the niobium micro-alloy
Change the chemical component of HRB400E hot rolling anti-seismic steel bar are as follows: by weight percentage, C:0.23-0.245%, Si:0.40-
0.50%, Mn:1.25-1.33%, Nb:0.025-0.030%, Ceq:0.45-0.49%, remaining for Fe and inevitably it is miscellaneous
Matter.
4. the producer of Nb-microalloying HRB400E hot rolling anti-seismic steel bar described in any one of claims 1 to 3 claim
Method, step include:
S1, converter smelting, continuous casting obtain slab, any one of chemical component and claims 1 to 3 of the slab claim institute
The chemical component for the Nb-microalloying HRB400E hot rolling anti-seismic steel bar stated is consistent；
S2, the slab is heated, then successively by roughing, in roll, finish rolling, through cold shears cutting to length after natural cooling,
Collecting packing obtains product after secondary natural cooling.
5. the production method of Nb-microalloying HRB400E hot rolling anti-seismic steel bar as claimed in claim 4, it is characterised in that: step
Continuous casting process step described in rapid S1 includes: 15-25 DEG C of the molten steel in bakie in continuous casting degree of superheat, 160 × 160 square casting blanks pulling rate 2.2-
2.4m/min, Water Rate for Secondary Cooling Water 1.6-1.8L/kg, continuous casting billet straightening temperature >=1000 DEG C.
6. the production method of Nb-microalloying HRB400E hot rolling anti-seismic steel bar as claimed in claim 4, it is characterised in that: step
The heating temperature of heating process described in rapid S2 is 1100-1180 DEG C, and heating time is 60-110 minutes, start rolling temperature 1060-
1100℃。
7. the production method of Nb-microalloying HRB400E hot rolling anti-seismic steel bar as claimed in claim 4, it is characterised in that: step
Roughing described in rapid S2 is the roughing of 5-7 passage, it is described in roll to be rolled in 3-4 passage, the finish rolling is the finish rolling of 4-10 passage.
8. the production method of Nb-microalloying HRB400E hot rolling anti-seismic steel bar as claimed in claim 4, it is characterised in that: step
In rapid S2, the natural cooling is the natural cooling on cold bed, and the temperature of steel is 950-1050 DEG C when upper cold bed, cooler environment temperature
Degree is 0-50 DEG C.
9. the production method of Nb-microalloying HRB400E hot rolling anti-seismic steel bar as claimed in claim 4, it is characterised in that: step
In rapid S2, the product specification is Φ 12mm- Φ 22mm.
10. the production method of Nb-microalloying HRB400E hot rolling anti-seismic steel bar as claimed in claim 4, it is characterised in that: step
In rapid S2, the steel after the cutting to length is placed on the transport road Kun and transports, and carries out on the transport road Kun described secondary naturally cold
But.
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109897953A (en) * | 2019-04-17 | 2019-06-18 | 福建三钢闽光股份有限公司 | A kind of Nb-microalloying HRB400E is precisely controlled the equipment and technique of phase-change organization |
| CN110029281A (en) * | 2019-05-29 | 2019-07-19 | 包头钢铁（集团）有限责任公司 | A kind of Nb-microalloying fine grain HRB400 reinforcing bar and preparation method thereof |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101007316A (en) * | 2007-01-24 | 2007-08-01 | 广州钢铁企业集团有限公司 | Method for producing niobium-contained HRB400 grade reinforcing steel |
| US20140353464A1 (en) * | 2010-03-25 | 2014-12-04 | Winky Lai | High strength rebar |
| CN104372246A (en) * | 2014-11-11 | 2015-02-25 | 江苏省沙钢钢铁研究院有限公司 | 400 MPa-level tungstenic corrosion-resistant twisted steel and preparation method thereof |
| CN104745968A (en) * | 2014-12-24 | 2015-07-01 | 福建三宝特钢有限公司 | HRB500E seismic steel bar and preparation method thereof |
| CN106350737A (en) * | 2016-08-31 | 2017-01-25 | 云南德胜钢铁有限公司 | Hot-rolled steel bar |
| CN106555123A (en) * | 2016-10-26 | 2017-04-05 | 江苏省沙钢钢铁研究院有限公司 | A kind of corrosion-resistant high yield ratio anti-seismic steel bar and its production method |
-
2018
- 2018-11-16 CN CN201811364876.9A patent/CN109355565A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101007316A (en) * | 2007-01-24 | 2007-08-01 | 广州钢铁企业集团有限公司 | Method for producing niobium-contained HRB400 grade reinforcing steel |
| US20140353464A1 (en) * | 2010-03-25 | 2014-12-04 | Winky Lai | High strength rebar |
| CN104372246A (en) * | 2014-11-11 | 2015-02-25 | 江苏省沙钢钢铁研究院有限公司 | 400 MPa-level tungstenic corrosion-resistant twisted steel and preparation method thereof |
| CN104745968A (en) * | 2014-12-24 | 2015-07-01 | 福建三宝特钢有限公司 | HRB500E seismic steel bar and preparation method thereof |
| CN106350737A (en) * | 2016-08-31 | 2017-01-25 | 云南德胜钢铁有限公司 | Hot-rolled steel bar |
| CN106555123A (en) * | 2016-10-26 | 2017-04-05 | 江苏省沙钢钢铁研究院有限公司 | A kind of corrosion-resistant high yield ratio anti-seismic steel bar and its production method |
Non-Patent Citations (1)
| Title |
|---|
| 杜长坤 主编: "《冶金工程概论》", 30 April 2012 * |
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110125174A (en) * | 2019-03-28 | 2019-08-16 | 盐城市联鑫钢铁有限公司 | A kind of HRB400E-F valve snail fine grain rolling mill practice method |
| CN109897953A (en) * | 2019-04-17 | 2019-06-18 | 福建三钢闽光股份有限公司 | A kind of Nb-microalloying HRB400E is precisely controlled the equipment and technique of phase-change organization |
| CN110029281A (en) * | 2019-05-29 | 2019-07-19 | 包头钢铁（集团）有限责任公司 | A kind of Nb-microalloying fine grain HRB400 reinforcing bar and preparation method thereof |
| CN110846562A (en) * | 2019-08-30 | 2020-02-28 | 陕钢集团汉中钢铁有限责任公司 | Niobium-containing anti-seismic steel bar and preparation method thereof |
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| CN111088451A (en) * | 2019-12-24 | 2020-05-01 | 江苏永钢集团有限公司 | 600 MPa-level steel bar for reinforced concrete and production method thereof |
| CN111187969A (en) * | 2020-02-17 | 2020-05-22 | 本钢板材股份有限公司 | Production method of 400 MPa-level niobium-nitrogen microalloyed twisted steel |
| CN112387790A (en) * | 2020-10-29 | 2021-02-23 | 江苏沙钢集团有限公司 | Disc spiral HRB400 and HRB400E produced by micro niobium and production process thereof |
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| CN117144253A (en) * | 2023-09-07 | 2023-12-01 | 中信金属股份有限公司 | Niobium microalloyed hot rolled ribbed steel bar and production method thereof |
| CN117144253B (en) * | 2023-09-07 | 2024-04-30 | 中信金属股份有限公司 | Niobium microalloyed hot rolled ribbed steel bar and production method thereof |
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