CN109023094A - A kind of NbV combined microalloying HRB400E reinforcing bar and production technology - Google Patents
A kind of NbV combined microalloying HRB400E reinforcing bar and production technology Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- 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
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
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- 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
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/002—Bainite
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/005—Ferrite
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/009—Pearlite
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Abstract
The invention discloses a kind of NbV combined microalloying HRB400E reinforcing bar and production technologies, the reinforcing bar chemical component composition and mass percentage are as follows: C:0.19-0.21%, Si:0.32-0.38%, Mn:1.33-1.38%, P≤0.041%, S≤0.041%, Nb:0.017-0.019%, V:0.010-0.014%, N:50-70ppm, O≤50ppm, surplus are Fe and inevitable impurity；The production technology includes smelting, continuous casting, rolling process.Reinforcing bar produced by the invention, metallographic structure F+P+B, grain size are 8.0-8.5 grades, and yield point elongation is obvious, and rebar surface is fine and close Fe3O4Tissue, grain structure refinement, the welding performance of reinforcing bar, cold-bending property, fatigue limit performance, antioxygenic property are better than using a kind of performance of alloy of Nb or V merely.
Description
Technical field
The invention belongs to metallurgical technology fields, and in particular to a kind of NbV combined microalloying HRB400E reinforcing bar and production work
Skill.
Background technique
National standard GB-T 1499.2-2018 defines the composition control of HRB400E reinforcing bar, but does not do in detail to its production technology
Thin regulation, mature technology is produced using Nb V microalloying technique at present, due to vanadium raw materials rise in price, simple vanadium
Microalloying higher cost, and merely with Nb-microalloying reinforcing bar yield strength value limit on the lower side and that there are yield point elongations is unconspicuous
Problem, niobium vanadium composite micro-alloying can effectively make up the deficiency of these two aspects, not only can guarantee reinforcement property, but also can reduce cost,
Good direction is provided for screw-thread steel production.
Although NbV combined microalloying technique has cost+quality-advantage, have no that any steel mill carries out substance
Production technology R&D work.
Xuan Gang is dedicated to the production of NbV combined microalloying process exploitation, and actual development process is because of C high 0.23-0.25%, out
Now cross the unconspicuous phenomenon of reinforcement property yield point elongation；N content control is higher, occurs causing the big performance of reinforcing bar aging performance low
In standard requirements phenomenon, oxygen content height leads to Nb, V alloy absorptivity labile element wild effect；It is united by test of many times
Meter analysis has finally determined the narrow composition science control range of carbon, the narrow composition production technology of silicon, manganese, niobium, vanadium, nitrogen, oxygen, product quality
Meet standard requirements.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of NbV combined microalloying HRB400E reinforcing bar and production technologies.
In order to solve the above technical problems, the technical solution used in the present invention is: a kind of NbV combined microalloying
HRB400E reinforcing bar, the reinforcing bar chemical component composition and its mass percentage are as follows: C:0.19-0.21%, Si:0.32-
0.38%, Mn:1.33-1.38%, P≤0.041%, S≤0.041%, Nb:0.017-0.019%, V:0.010-0.014%, N:50-
70ppm, O≤50ppm, surplus are Fe and inevitable impurity.
Reinforcing bar chemical component composition and its mass percentage of the present invention are as follows: C:0.20%, Si:0.35%, Mn:
1.36%, P≤0.036%, S≤0.036%, Nb:0.018%, V:0.013%, N:60ppm, O≤40ppm, surplus are Fe and can not
The impurity avoided.
Bar gauge of the present invention is Φ 12-25mm；Metallographic structure is ferrite (F)+pearlite (P)+bainite
(B), ferrite+pearlite >=90%, bainite≤10%, grain size are 8.0-8.5 grades.
Reinforcement yielding intensity 430-460MPa of the present invention, tensile strength 590-615MPa, elongation 27-35%, Agt:
13-14%, strong flexor ratio 1.33-1.38, clod wash recurvation are functional.
The present invention also provides a kind of production technology of NbV combined microalloying HRB400E reinforcing bar, the production technology packets
Include smelting, continuous casting, rolling process；The smelting procedure, using the top compound converter smelting in bottom, Nb alloying uses 0.27-
The FeNb60-B of 0.30kg/t steel, absorptivity 85%, V alloyization use the FeV50-A of 0.16-0.24kg/t steel, absorptivity 90%,
Terminal point control uses highcasting speed technique；The rolling process, 970-1000 DEG C of start rolling temperature.
Smelting procedure of the present invention, using the top compound converter smelting in bottom, at converter smelting 720 seconds, bottom blowing system for converter
It automatically switches into argon gas and carries out bottom blowing stirring, monolithic brick bottom blowing flow is 40m3/ h, according to the nominal capacity of converter, bottom blowing is ventilative
Brick is 4,6,8 pieces.The uniform liquid steel temperature of necessary ladle bottom blowing argon gas and composition, removal of inclusions technique must be taken.
Smelting procedure of the present invention, terminal point control use highcasting speed technique, converter smelting endpoint: C >=0.10%, P≤
0.030%, S≤0.035%, N:40-50ppm.
Smelting procedure of the present invention, convertor deacidification alloying, carburant use the petroleum coke of 0.70-0.80kg/t steel,
Silicomanganization uses the silicomanganese of 19-20kg/t steel, the ferrosilicon of 0.9-1.1kg/t steel；Deoxidier is using 0.5-1.0kg/t steel
Si-Al-Ba alloy strontium.Nb alloying is using the FeNb60-B in GB/T 7737-2007 " ferro-niobium "；V alloyization uses GB/T 4139-
FeV50-A in 2012 " vanadium iron ".
Continuous casting working procedure of the present invention is continuously poured the packet degree of superheat in heat and controls at 20-30 DEG C, and two furnaces overheat before middle packet
Degree control is at 30-50 DEG C.
Rolling process of the present invention, 970-1000 DEG C of start rolling temperature, 900-920 DEG C of temperature on cooling table
Mentality of designing of the present invention:
Using the top compound converter smelting in bottom, converter top and bottom complex blowing uses nitrogen argon switching technique, and terminal point control uses highcasting speed technique,
Steel oxygen content in water is reduced, the higher stable absorptivity of C, Si, Mn, Nb, V alloy is effectively guaranteed, to stabilize
The performance of composition control and reinforcing bar.
Using+50 vanadium iron proportion scheme of Nb iron, NbV combined microalloying production technology, Si, Mn, V, Nb are used
Narrow composition control technique, the control of Si, Mn, Nb, V absorptivity is stablized, and according to Nb and V microalloying technique characteristic, is calculated best
Carbon, Control of Nitrogen Content range, given full play to Nb+V Microalloying Effect.
Using the rolling temperature and temperature on cooling table of narrow temperature range, rolling concrete steel bar specification is Φ 12, Φ 14, Φ 16, Φ
18, Φ 20, Φ 22,25 specification straight steel bar of Φ guarantee in conjunction with the narrow composition control range of effective C, Si, Mn, Nb, V, N science
Bainite structure in NbV microalloying reinforcing bar is not more than 10%, remaining all ferrite+pearlitic structrure, to guarantee steel
The yield point elongation of muscle is obvious and stablizes.
Reinforcing bar temperature on cooling table is controlled at 900-920 DEG C, has given full play to the cold technique of control, and rebar surface is fine and close
Fe304, avoid rebar surface Fe203Transition temperature improves the oxidation resistance of reinforcing bar.
NbV combined microalloying HRB400E reinforcing bar product standard of the present invention refers to GB/T 1499.2-2018；Properties of product
Detection method canonical reference GB/T 228.1-2010.
The beneficial effects of adopting the technical scheme are that the 1, present invention uses vanadium micro-alloying technology with simple
Project plan comparison, yield strength performance, the tensile strength properties using production technology reinforcing bar of the present invention are more stable, continue in vanadium alloy
Under the influence of the factor of rise in price, cost reduces >=20 yuan/ton of steel, has the double advantages of quality, cost.2, the present invention uses Nb with simple
Micro-alloying technology project plan comparison solves to play Nb Microalloying Effect and uses high start rolling temperature, and yield point elongation is unknown
Aobvious problem.3, reinforcing bar produced by the invention, metallographic structure F+P+B, ferrite+pearlite >=90%, bainite≤10% are brilliant
Granularity is 8.0-8.5 grades, and yield point elongation is obvious, and rebar surface is fine and close Fe3O4Tissue, grain structure refinement, the welding of reinforcing bar
Performance, cold-bending property, fatigue limit performance, antioxygenic property use a kind of performance of alloy of Nb or V better than simple.
Specific embodiment
Present invention will be explained in further detail combined with specific embodiments below.
Embodiment 1
The present embodiment NbV combined microalloying HRB400E bar gauge be tetra- cutting reinforcing bar of Φ 12mm, chemical component composition and
Mass percentage are as follows: C:0.21%, Si:0.35%, Mn:1.36%, P:0.028%, S:0.015%, Nb:0.018%, V:
0.012%, N:64ppm, O:43ppm, surplus are Fe and inevitable impurity.
The production technology of the present embodiment NbV combined microalloying HRB400E reinforcing bar includes smelting, continuous casting, rolling process, tool
That steps are as follows is described for body technology:
(1) smelting procedure: using the top compound converter smelting in bottom, converter top and bottom complex blowing uses nitrogen argon switching technique；Convertor deacidification closes
Aurification, carburant use the petroleum coke of 0.78kg/t steel, alloying using the silicomanganese of 20kg/t steel, 1.0kg/t steel ferrosilicon,
The FeV50-A of FeNb60-B, 0.20kg/t steel of 0.28kg/t steel, deoxidier use the Si-Al-Ba alloy strontium of 0.5kg/t steel；Terminal control
System uses highcasting speed technique, converter smelting endpoint: C:0.13%, P:0.024%, S:0.014%, N:48ppm；
(2) continuous casting working procedure: the control of the packet degree of superheat is at 25 DEG C in continuous casting heat；
(3) rolling process: 980 DEG C of start rolling temperature, 910 DEG C of temperature on cooling table.
The present embodiment NbV combined microalloying HRB400E reinforcement property index is shown in Table 1, metallographic structure 40%F+52%P+
8%B。
1 rolling specs Φ of table, 12 4 cutting reinforcement property
Embodiment 2
The present embodiment NbV combined microalloying HRB400E bar gauge be tri- cutting reinforcing bar of Φ 14mm, chemical component composition and
Mass percentage are as follows: C:0.20%, Si:0.36%, Mn:1.35%, P:0.032%, S:0.028%, Nb:0.019%, V:
0.011%, N:62ppm, O:45ppm, surplus are Fe and inevitable impurity.
The production technology of the present embodiment NbV combined microalloying HRB400E reinforcing bar includes smelting, continuous casting, rolling process, tool
That steps are as follows is described for body technology:
(1) smelting procedure: using the top compound converter smelting in bottom, converter top and bottom complex blowing uses nitrogen argon switching technique；Convertor deacidification closes
Aurification, carburant use the petroleum coke of 0.70kg/t steel, alloying using the silicomanganese of 20kg/t steel, 1.0kg/t steel ferrosilicon,
The FeV50-A of FeNb60-B, 0.18kg/t steel of 0.30kg/t steel, deoxidier use the Si-Al-Ba alloy strontium of 0.8kg/t steel；Terminal control
System uses highcasting speed technique, converter smelting endpoint: C:0.10%, P:0.028%, S:0.025%, N:45ppm；
(2) continuous casting working procedure: the control of the packet degree of superheat is at 30 DEG C in continuous casting heat；
(3) rolling process: 990 DEG C of start rolling temperature, 910 DEG C of temperature on cooling table.
The present embodiment NbV combined microalloying HRB400E reinforcement property index is shown in Table 2, metallographic structure 35%F+58%P+
7%B。
2 rolling specs Φ of table, 14 3 cutting reinforcement property
Embodiment 3
The present embodiment NbV combined microalloying HRB400E bar gauge be bis- cutting reinforcing bar of Φ 16mm, chemical component composition and
Mass percentage are as follows: C:0.21%, Si:0.37%, Mn:1.34%, P:0.029%, S:0.025%, Nb:0.017%, V:
0.013%, N:65ppm, O:41ppm, surplus are Fe and inevitable impurity.
The production technology of the present embodiment NbV combined microalloying HRB400E reinforcing bar includes smelting, continuous casting, rolling process, tool
That steps are as follows is described for body technology:
(1) smelting procedure: using the top compound converter smelting in bottom, converter top and bottom complex blowing uses nitrogen argon switching technique；Convertor deacidification closes
Aurification, carburant use the petroleum coke of 0.8kg/t steel, alloying using the silicomanganese of 19.5kg/t steel, 1.1kg/t steel ferrosilicon,
The FeV50-A of FeNb60-B, 0.22kg/t steel of 0.27kg/t steel, deoxidier use the Si-Al-Ba alloy strontium of 0.5kg/t steel；Terminal control
System uses highcasting speed technique, converter smelting endpoint: C:0.12%, P:0.025%, S:0.015%, N:50ppm；
(2) continuous casting working procedure: middle packet is poured the control of the 1st heat degree of superheat at 30 DEG C；
(3) rolling process: 975 DEG C of start rolling temperature, 900 DEG C of temperature on cooling table.
The present embodiment NbV combined microalloying HRB400E reinforcement property index is shown in Table 3, metallographic structure 38%F+55%P+
7%B。
3 rolling specs Φ of table, 16 2 cutting reinforcement property
Embodiment 4
The present embodiment NbV combined microalloying HRB400E bar gauge be bis- cutting reinforcing bar of Φ 18mm, chemical component composition and
Mass percentage are as follows: C:0.20%, Si:0.34%, Mn:1.37%, P:0.036%, S:0.014%, Nb:0.017%, V:
0.011%, N:59ppm, O:40ppm, surplus are Fe and inevitable impurity.
The production technology of the present embodiment NbV combined microalloying HRB400E reinforcing bar includes smelting, continuous casting, rolling process, tool
That steps are as follows is described for body technology:
(1) smelting procedure: using the top compound converter smelting in bottom, converter top and bottom complex blowing uses nitrogen argon switching technique；Convertor deacidification closes
Aurification, carburant use the petroleum coke of 0.70kg/t steel, alloying using the silicomanganese of 20kg/t steel, 1.0kg/t steel ferrosilicon,
The FeV50-A of FeNb60-B, 0.18kg/t steel of 0.27kg/t steel, deoxidier use the Si-Al-Ba alloy strontium of 0.5kg/t steel；Terminal control
System uses highcasting speed technique, converter smelting endpoint: C:0.10%, P:0.030%, S:0.012%, N:44ppm；
(2) continuous casting working procedure: the control of the packet degree of superheat is at 28 DEG C in continuous casting heat；
(3) rolling process: 985 DEG C of start rolling temperature, 900 DEG C of temperature on cooling table.
The present embodiment NbV combined microalloying HRB400E reinforcement property index is shown in Table 4, metallographic structure 40%F+55%P+
5%B。
4 rolling specs Φ of table, 18 2 cutting reinforcement property
Embodiment 5
The present embodiment NbV combined microalloying HRB400E bar gauge be bis- cutting reinforcing bar of Φ 20mm, chemical component composition and
Mass percentage are as follows: C:0.21%, Si:0.32%, Mn:1.38%, P:0.025%, S:0.041%, Nb:0.017%, V:
0.014%, N:50ppm, O:20ppm, surplus are Fe and inevitable impurity.
The production technology of the present embodiment NbV combined microalloying HRB400E reinforcing bar includes smelting, continuous casting, rolling process, tool
That steps are as follows is described for body technology:
(1) smelting procedure: using the top compound converter smelting in bottom, converter top and bottom complex blowing uses nitrogen argon switching technique；Convertor deacidification closes
Aurification, carburant use the petroleum coke of 0.75kg/t steel, alloying using the silicomanganese of 20kg/t steel, 0.9kg/t steel ferrosilicon,
The FeV50-A of FeNb60-B, 0.24kg/t steel of 0.27kg/t steel, deoxidier use the Si-Al-Ba alloy strontium of 0.8kg/t steel；Terminal control
System uses highcasting speed technique, converter smelting endpoint: C:0.11%, P:0.022%, S:0.035%, N:40ppm；
(2) continuous casting working procedure: the control of the packet degree of superheat is at 20 DEG C in continuous casting heat；
(3) rolling process: 1000 DEG C of start rolling temperature, 900 DEG C of temperature on cooling table.
The present embodiment NbV combined microalloying HRB400E reinforcement property index is shown in Table 5, metallographic structure 40%F+50%P+
10%B。
5 rolling specs Φ of table, 20 2 cutting reinforcement property
Embodiment 6
The present embodiment NbV combined microalloying HRB400E bar gauge be bis- cutting reinforcing bar of Φ 22mm, chemical component composition and
Mass percentage are as follows: C:0.19%, Si:0.38%, Mn:1.33%, P:0.041%, S:0.030%, Nb:0.019%, V:
0.010%, N:70ppm, O:50ppm, surplus are Fe and inevitable impurity.
The production technology of the present embodiment NbV combined microalloying HRB400E reinforcing bar includes smelting, continuous casting, rolling process, tool
That steps are as follows is described for body technology:
(1) smelting procedure: using the top compound converter smelting in bottom, converter top and bottom complex blowing uses nitrogen argon switching technique；Convertor deacidification closes
Aurification, carburant use the petroleum coke of 0.72kg/t steel, alloying using the silicomanganese of 19.0kg/t steel, 1.1kg/t steel ferrosilicon,
The FeV50-A of FeNb60-B, 0.16kg/t steel of 0.30kg/t steel, deoxidier use the Si-Al-Ba alloy strontium of 1.0kg/t steel；Terminal control
System uses highcasting speed technique, converter smelting endpoint: C:0.12%, P:0.028%, S:0.027%, N:45ppm；
(2) continuous casting working procedure: middle packet is poured the control of the 2nd heat degree of superheat at 50 DEG C；
(3) rolling process: 970 DEG C of start rolling temperature, 910 DEG C of temperature on cooling table.
The present embodiment NbV combined microalloying HRB400E reinforcement property index is shown in Table 6, metallographic structure 40%F+55%P+
5%B。
6 rolling specs Φ of table, 22 2 cutting reinforcement property
Embodiment 7
The present embodiment NbV combined microalloying HRB400E bar gauge is Φ 25mm single line reinforcing bar, chemical component composition and matter
Measure percentage composition are as follows: C:0.20%, Si:0.35%, Mn:1.36%, P:0.036%, S:0.036%, Nb:0.018%, V:0.013%,
N:60ppm, O:40ppm, surplus are Fe and inevitable impurity.
The production technology of the present embodiment NbV combined microalloying HRB400E reinforcing bar includes smelting, continuous casting, rolling process, tool
That steps are as follows is described for body technology:
(1) smelting procedure: using the top compound converter smelting in bottom, converter top and bottom complex blowing uses nitrogen argon switching technique；Convertor deacidification closes
Aurification, carburant use the petroleum coke of 0.70kg/t steel, alloying using the silicomanganese of 20kg/t steel, 1.0kg/t steel ferrosilicon,
The FeV50-A of FeNb60-B, 0.20kg/t steel of 0.29kg/t steel, deoxidier use the Si-Al-Ba alloy strontium of 1.0kg/t steel；Terminal control
System uses highcasting speed technique, converter smelting endpoint: C:0.10%, P:0.030%, S:0.032%, N:45ppm；
(2) continuous casting working procedure: the control of the packet degree of superheat is at 24 DEG C in continuous casting heat；
(3) rolling process: 988 DEG C of start rolling temperature, 920 DEG C of temperature on cooling table.
The present embodiment NbV combined microalloying HRB400E reinforcement property index is shown in Table 7, metallographic structure 40%F+60%P.
7 rolling specs Φ of table, 25 single line reinforcement property
The above embodiments are only used to illustrate and not limit the technical solutions of the present invention, although referring to above-described embodiment to the present invention into
Go detailed description, those skilled in the art should understand that: it can still modify to the present invention or equally replace
It changes, without departing from the spirit or scope of the invention, or any substitutions, should all cover and be wanted in right of the invention
It asks in range.
Claims (10)
1. a kind of NbV combined microalloying HRB400E reinforcing bar, which is characterized in that the reinforcing bar chemical component composition and its quality
Percentage composition are as follows: C:0.19-0.21%, Si:0.32-0.38%, Mn:1.33-1.38%, P≤0.041%, S≤0.041%, Nb:
0.017-0.019%, V:0.010-0.014%, N:50-70ppm, O≤50ppm, surplus are Fe and inevitable impurity.
2. a kind of NbV combined microalloying HRB400E reinforcing bar according to claim 1, which is characterized in that the reinforcing bar
Study and be grouped as and its mass percentage are as follows: C:0.20%, Si:0.35%, Mn:1.36%, P≤0.036%, S≤0.036%,
Nb:0.018%, V:0.013%, N:60ppm, O≤40ppm, surplus are Fe and inevitable impurity.
3. a kind of NbV combined microalloying HRB400E reinforcing bar according to claim 1, which is characterized in that the reinforcing bar rule
Lattice are Φ 12-25mm；Metallographic structure be ferrite+pearlite+bainite, ferrite+pearlite >=90%, bainite≤10%,
Grain size is 8.0~8.5 grades.
4. a kind of NbV combined microalloying HRB400E reinforcing bar according to claim 1, which is characterized in that the reinforcing bar is bent
Take intensity 430-460MPa, tensile strength 590-615MPa, elongation 27-35%, Agt:13-14%, strong flexor ratio 1.33-1.38,
Clod wash recurvation is functional.
5. based on a kind of production technology of NbV combined microalloying HRB400E reinforcing bar described in claim 1-4 any one,
It is characterized in that, the production technology includes smelting, continuous casting, rolling process；The smelting procedure, using the top compound converter smelting in bottom
Refining, Nb alloying use the FeNb60-B of 0.27-0.30kg/t steel, absorptivity 85%, and V alloyization uses 0.16-0.24kg/t steel
FeV50-A, absorptivity 90%, terminal point control use highcasting speed technique；The rolling process, 970-1000 DEG C of start rolling temperature.
6. a kind of production technology of NbV combined microalloying HRB400E reinforcing bar according to claim 5, which is characterized in that
The smelting procedure, using the top compound converter smelting in bottom, at converter smelting 720 seconds, bottom blowing system for converter automatically switches into argon gas
Bottom blowing stirring is carried out, monolithic brick bottom blowing flow is 40m3/ h, according to the nominal capacity of converter, 4,6,8 pieces of bottom-blown air brick.
7. a kind of production technology of NbV combined microalloying HRB400E reinforcing bar according to claim 5, which is characterized in that
The smelting procedure, terminal point control use highcasting speed technique, converter smelting endpoint: C >=0.10%, P≤0.030%, S≤
0.035%, N:40-50ppm.
8. a kind of production technology of NbV combined microalloying HRB400E reinforcing bar according to claim 5-7 any one,
It is characterized in that, the smelting procedure, convertor deacidification alloying, carburant use the petroleum coke of 0.70-0.80kg/t steel, silicomanganese
Alloying uses the silicomanganese of 19-20kg/t steel, the ferrosilicon of 0.9-1.1kg/t steel；Deoxidier uses the sial of 0.5-1.0kg/t steel
Barium strontium.
9. a kind of production technology of NbV combined microalloying HRB400E reinforcing bar according to claim 5-7 any one,
It is characterized in that, the continuous casting working procedure, is continuously poured the packet degree of superheat in heat and controls at 20-30 DEG C, the two furnace degree of superheat before middle packet
Control is at 30-50 DEG C.
10. a kind of production technology of NbV combined microalloying HRB400E reinforcing bar according to claim 5-7 any one,
It is characterized in that, the rolling process, 970-1000 DEG C of start rolling temperature, 900-920 DEG C of temperature on cooling table.
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| CN201811052750.8A CN109023094A (en) | 2018-09-10 | 2018-09-10 | A kind of NbV combined microalloying HRB400E reinforcing bar and production technology |
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| 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 |
| CN110885952A (en) * | 2019-12-16 | 2020-03-17 | 本钢板材股份有限公司 | 400 MPa-grade hot-rolled ribbed steel bar and preparation method thereof |
| CN111519100A (en) * | 2020-01-11 | 2020-08-11 | 武钢集团昆明钢铁股份有限公司 | Niobium-vanadium microalloyed 400 MPa-grade ultrafine-grain high-toughness anti-seismic reinforcing steel bar and preparation method thereof |
| CN111876667A (en) * | 2020-06-24 | 2020-11-03 | 宣化钢铁集团有限责任公司 | HRB500E steel bar produced by micro-nitrogen alloy and production process thereof |
| CN112143967A (en) * | 2020-08-26 | 2020-12-29 | 盐城市联鑫钢铁有限公司 | Low-cost micro-vanadium ultrafine-grained steel bar and rolling process thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| 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 |
| CN110885952A (en) * | 2019-12-16 | 2020-03-17 | 本钢板材股份有限公司 | 400 MPa-grade hot-rolled ribbed steel bar and preparation method thereof |
| CN111519100A (en) * | 2020-01-11 | 2020-08-11 | 武钢集团昆明钢铁股份有限公司 | Niobium-vanadium microalloyed 400 MPa-grade ultrafine-grain high-toughness anti-seismic reinforcing steel bar and preparation method thereof |
| CN111876667A (en) * | 2020-06-24 | 2020-11-03 | 宣化钢铁集团有限责任公司 | HRB500E steel bar produced by micro-nitrogen alloy and production process thereof |
| CN112143967A (en) * | 2020-08-26 | 2020-12-29 | 盐城市联鑫钢铁有限公司 | Low-cost micro-vanadium ultrafine-grained steel bar and rolling process thereof |
| CN112143967B (en) * | 2020-08-26 | 2021-06-15 | 盐城市联鑫钢铁有限公司 | Low-cost micro-vanadium ultrafine-grained steel bar and rolling process thereof |
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