CN105525204A - Production method of steel bar with good anti-shock property - Google Patents

Production method of steel bar with good anti-shock property Download PDF

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Publication number
CN105525204A
CN105525204A CN201510988398.9A CN201510988398A CN105525204A CN 105525204 A CN105525204 A CN 105525204A CN 201510988398 A CN201510988398 A CN 201510988398A CN 105525204 A CN105525204 A CN 105525204A
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steel
reinforcing bar
production
good
rolling
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CN201510988398.9A
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刘家容
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刘家容
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Classifications

    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21CPROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/0006Adding metallic additives
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING 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
    • C21D6/00Heat treatment of ferrous alloys
    • C21D6/005Heat treatment of ferrous alloys containing Mn
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING 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
    • C21D8/00Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/06Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires
    • C21D8/065Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires of ferrous alloys
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING 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
    • C21D8/00Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/06Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires
    • C21D8/08Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires for concrete reinforcement
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/002Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/02Ferrous alloys, e.g. steel alloys containing silicon
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/04Ferrous alloys, e.g. steel alloys containing manganese
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/08Ferrous alloys, e.g. steel alloys containing nickel
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/12Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/14Ferrous alloys, e.g. steel alloys containing titanium or zirconium

Abstract

The invention relates to a production method of a steel bar with good anti-shock property and belongs to the technical field of manufacturing of a steel product. The production method comprises the following steps: coarsely smelting to obtain coarse liquid steel; discharging the liquid steel; deoxidizing while discharging the liquid steel, wherein the coarse liquid steel consists of the following ingredients in percentage by weight: 0.05% to 0.13% of C, 1.40% to 1.80% of Mn, 0.15% to 0.40% of Si, smaller than or equal to 0.006% of P, smaller than or equal to 0.005% of S, 0.20% to 0.40% of Ti, 0.80% to 1.30% of Ni, 0.06% to 0.20% of Ca, smaller than or equal to 0.15% of V, 0.020% to 0.050% of Nb and the balance of Fe and inevitable impurities; sequentially performing refining, casting, rolling and air cooling to obtain the steel bar. By reasonably controlling the constitution and smelting procedures of the steel, the steel bar prepared by the method disclosed by the invention is improved in toughness and anti-shock property.

Description

The production method of the reinforcing bar that a kind of anti-seismic performance is good
Technical field
The present invention relates to the production method of the good reinforcing bar of a kind of anti-seismic performance, belong to steel manufacturing technology field.
Background technology
Reinforcing bar is as the chief component of ferrous materials, it is the main strongthener of reinforced concrete buildings, carry in the structure draw, stress and strain, high week or low cycle fatigue effect, high temperature or cold short effect, physics or chemical corrosion, the various load such as reinforcing bar reprocessing effect, make concrete can meet various functional requirement, be widely used.For improving the security of buildings, Foreign Architecture industry generally adopts the anti-seismic steel bar that good welding performance, intensity are high, as the countries such as America and Europe, Australia, New Zealand mainly use 400MPa, 500MPa grade high-strength degree anti-seismic steel bar.
Compared with regular reinforcement, anti-seismic steel bar also has shockproof requirements, so the important performance indexes of anti-seismic steel bar is except there being tensile strength (R m) and yield strength (R eL) also have strong flexor ratio (R outward 0 m/ R 0 eL), bend bend than (R 0 eL/ R eL), not only require that having higher and stable yield strength also requires to have good ductility (adopting uniform elongation and yield tensile ratio to characterize), high strain low cycle fatigue performance.CN102071357A discloses a kind of rich nitrogen Nb-V-microalloyed 500MPa, 550MPa high-strength anti-seismic steel bar and smelting process, there is the chemical composition of following masses mark: C:0.20 ~ 0.25wt%, Si:0.35 ~ 0.55wt%, Mn:1.35 ~ 1.58wt%, V:0.013 ~ 0.025wt%, Nb:0.019 ~ 0.032wt%, N:0.065 ~ 0.085wt%, S≤0.040wt%, P≤0.040wt%, all the other are Fe and inevitable impurity, this reinforcing bar is by increasing N and falling V, Nb, make microalloy V, the strengthening effect of Nb is not fully exerted, ferro-niobium, VN alloy add-on reduces, save precious alloy add-on.But still there is the not high problem of anti-seismic performance at the reinforcing bar that aforesaid method prepares.
Summary of the invention
The object of the invention is: a kind of working method with the reinforcing bar of good anti-seismic performance is provided.
Technical scheme is:
A production method for the reinforcing bar that anti-seismic performance is good, its preparation process comprises the steps:
1st step, slightly refines, obtains crude molten steel, and tapping, carries out deoxidation in tapping process; The moiety of described crude molten steel is by weight percentage: C:0.05 ~ 0.13, Mn:1.40 ~ 1.80, Si:0.15 ~ 0.40, P :≤0.006, S :≤0.005, Ti:0.20 ~ 0.40, Ni:0.80 ~ 1.30, Ca:0.06 ~ 0.20, V :≤0.15, Nb:0.020 ~ 0.050, surplus is Fe and inevitable impurity;
2nd step, refining, adds ferrophosphorus in process, makes the content of the P in molten steel 0.020 ~ 0.030%;
3rd step, casts, and obtains rolling concrete steel bar steel billet;
Rolling concrete steel bar heating steel billet to 1180 ~ 1230 DEG C are incubated, lower the temperature afterwards, then are rolled by the 4th step again, terminate rolling to time between 820 ~ 840 DEG C, the reinforcing bar air cooling of rolling to room temperature, obtained reinforcing bar.
In the 1st described step, the thick refining equipment of crude molten steel is electric furnace, converter, induction furnace or open hearth.
In the 2nd described step, the refining furnace adopted in refining is LF, RH, VD or VOD stove.
In the 4th described step, soaking time is 55 ~ 125 minutes.
In the 4th described step, the temperature of cooling is 1000 ~ 1050 DEG C.
Beneficial effect
Reinforcing bar prepared by the present invention, consists of and smelting program conservative control steel, makes the toughness of reinforcing bar, anti-seismic performance is improved.
Embodiment
Embodiment 1
The production method of reinforcing bar, its preparation process comprises the steps:
1st step, electric furnace slightly refines, and obtains crude molten steel, and tapping, carries out deoxidation in tapping process; The moiety of described crude molten steel is by weight percentage: C:0.05, Mn:1.40, Si:0.15, P:0.004, S:0.002, Ti:0.20, Ni:0.80, Ca:0.02, V:0.11, Nb:0.020, and surplus is Fe and inevitable impurity;
2nd step, the refining of LF stove, adds ferrophosphorus in process, makes the content of the P in molten steel 0.020%;
3rd step, casts, and obtains rolling concrete steel bar steel billet;
4th step, is incubated 55 minutes again by rolling concrete steel bar heating steel billet to 1180 DEG C, cools to 1000 DEG C afterwards, then be rolled, and terminates rolling to time between 820 DEG C, the reinforcing bar air cooling of rolling to room temperature, obtained reinforcing bar.
Embodiment 2
1st step, electric furnace slightly refines, and obtains crude molten steel, and tapping, carries out deoxidation in tapping process; The moiety of described crude molten steel is by weight percentage: C:0.13, Mn:1.80, Si:0.40, P:0.003, S:0.003, Ti:0.40, Ni:1.30, Ca:0.10, V:0.12, Nb:0.050, and surplus is Fe and inevitable impurity;
2nd step, the refining of LF stove, adds ferrophosphorus in process, makes the content of the P in molten steel 0.030%;
3rd step, casts, and obtains rolling concrete steel bar steel billet;
4th step, is incubated 125 minutes again by rolling concrete steel bar heating steel billet to 1230 DEG C, cools to 1050 DEG C afterwards, then be rolled, and terminates rolling to time between 840 DEG C, the reinforcing bar air cooling of rolling to room temperature, obtained reinforcing bar.
Embodiment 3
1st step, electric furnace slightly refines, and obtains crude molten steel, and tapping, carries out deoxidation in tapping process; The moiety of described crude molten steel is by weight percentage: C:0.09, Mn:1.60, Si:0.30, P:0.005, S:0.003, Ti:0.30, Ni:1.10, Ca:0.08, V:0.12, Nb:0.030, and surplus is Fe and inevitable impurity;
2nd step, the refining of LF stove, adds ferrophosphorus in process, makes the content of the P in molten steel 0.025%;
3rd step, casts, and obtains rolling concrete steel bar steel billet;
4th step, is incubated 100 minutes again by rolling concrete steel bar heating steel billet to 1200 DEG C, cools to 1020 DEG C afterwards, then be rolled, and terminates rolling to time between 830 DEG C, the reinforcing bar air cooling of rolling to room temperature, obtained reinforcing bar.
Reference examples 1
Be with the difference of embodiment 3: in the preparation of crude molten steel, do not add Ca.
1st step, electric furnace slightly refines, and obtains crude molten steel, and tapping, carries out deoxidation in tapping process; The moiety of described crude molten steel is by weight percentage: C:0.09, Mn:1.60, Si:0.30, P:0.005, S:0.003, Ti:0.30, Ni:1.10, V:0.12, Nb:0.030, and surplus is Fe and inevitable impurity;
2nd step, the refining of LF stove, adds ferrophosphorus in process, makes the content of the P in molten steel 0.025%;
3rd step, casts, and obtains rolling concrete steel bar steel billet;
4th step, is incubated 100 minutes again by rolling concrete steel bar heating steel billet to 1200 DEG C, cools to 1020 DEG C afterwards, then be rolled, and terminates rolling to time between 830 DEG C, the reinforcing bar air cooling of rolling to room temperature, obtained reinforcing bar.
Reference examples 2
Be with the difference of embodiment 3: in the preparation of crude molten steel, do not add Ti.
1st step, electric furnace slightly refines, and obtains crude molten steel, and tapping, carries out deoxidation in tapping process; The moiety of described crude molten steel is by weight percentage: C:0.09, Mn:1.60, Si:0.30, P:0.005, S:0.003, Ni:1.10, Ca:0.08, V:0.12, Nb:0.030, and surplus is Fe and inevitable impurity;
2nd step, the refining of LF stove, adds ferrophosphorus in process, makes the content of the P in molten steel 0.025%;
3rd step, casts, and obtains rolling concrete steel bar steel billet;
4th step, is incubated 100 minutes again by rolling concrete steel bar heating steel billet to 1200 DEG C, cools to 1020 DEG C afterwards, then be rolled, and terminates rolling to time between 830 DEG C, the reinforcing bar air cooling of rolling to room temperature, obtained reinforcing bar.
Reference examples 3
Do not add ferrophosphorus in refining process, but the content of the P in crude molten steel is controlled 0.025%.
1st step, electric furnace slightly refines, and obtains crude molten steel, and tapping, carries out deoxidation in tapping process; The moiety of described crude molten steel is by weight percentage: C:0.09, Mn:1.60, Si:0.30, P:0.025, S:0.003, Ti:0.30, Ni:1.10, Ca:0.08, V:0.12, Nb:0.030, and surplus is Fe and inevitable impurity;
2nd step, the refining of LF stove;
3rd step, casts, and obtains rolling concrete steel bar steel billet;
4th step, is incubated 100 minutes again by rolling concrete steel bar heating steel billet to 1200 DEG C, cools to 1020 DEG C afterwards, then be rolled, and terminates rolling to time between 830 DEG C, the reinforcing bar air cooling of rolling to room temperature, obtained reinforcing bar.
Test by GB1499.12007 " concrete reinforcement steel second section hot rolled ribbed steel bar " requirement: difference is in table 1.
Table 1 Ribbed Bar performance
R e1 /MPa R m /MPa A /% R 0 m/R 0 e1 /MPa R 0 e1/R e1 /MPa
Embodiment 1 410 530 15 1.23 1.3
Embodiment 2 400 520 14 1.22 1.4
Embodiment 3 420 540 16 1.31 1.2
Reference examples 1 390 480 11 1.18 1.6
Reference examples 2 390 480 10 1.18 1.8
Reference examples 3 380 490 12 1.10 1.7
Note: R 0 elreinforcing bar actual measurement yield strength; R 0 mreinforcing bar actual measurement tensile strength.
Learnt by upper table data: according to the requirement of GB, the present invention produces the anti-seismic steel bar obtained and meets yield strength, tensile strength requirement; Reinforcing bar actual measurement yield strength surveys tensile strength ratio with reinforcing bar in addition, the ratio that yield strength and standard specify yield strength surveyed by reinforcing bar, also has preferably performance.Wherein, embodiment 3, relative to reference examples 1, adds Ca composition, can improve yield strength; Embodiment 3, relative to reference examples 2, adds Ti composition, can improve actual measurement tensile strength; Embodiment 3, relative to reference examples 3, by adding P in the process of refining, reinforcing bar actual measurement yield strength and reinforcing bar can survey tensile strength ratio R significantly 0 m/ R 0 e1improve, make its anti seismic efficiency better.

Claims (5)

1. a production method for the reinforcing bar that anti-seismic performance is good, is characterized in that, its preparation process comprises the steps: the 1st step, slightly refines, obtains crude molten steel, and tapping, carries out deoxidation in tapping process; The moiety of described crude molten steel is by weight percentage: C:0.05 ~ 0.13, Mn:1.40 ~ 1.80, Si:0.15 ~ 0.40, P :≤0.006, S :≤0.005, Ti:0.20 ~ 0.40, Ni:0.80 ~ 1.30, Ca:0.06 ~ 0.20, V :≤0.15, Nb:0.020 ~ 0.050, surplus is Fe and inevitable impurity; 2nd step, refining, adds ferrophosphorus in process, makes the content of the P in molten steel 0.020 ~ 0.030%; 3rd step, casts, and obtains rolling concrete steel bar steel billet; Rolling concrete steel bar heating steel billet to 1180 ~ 1230 DEG C are incubated, lower the temperature afterwards, then are rolled by the 4th step again, terminate rolling to time between 820 ~ 840 DEG C, the reinforcing bar air cooling of rolling to room temperature, obtained reinforcing bar.
2. the production method of the reinforcing bar that anti-seismic performance according to claim 1 is good, is characterized in that: in the 1st described step, and the thick refining equipment of crude molten steel is electric furnace, converter, induction furnace or open hearth.
3. the production method of the reinforcing bar that anti-seismic performance according to claim 1 is good, is characterized in that: in the 2nd described step, the refining furnace adopted in refining is LF, RH, VD or VOD stove.
4. the production method of the reinforcing bar that anti-seismic performance according to claim 1 is good, is characterized in that: in the 4th described step, soaking time is 55 ~ 125 minutes.
5. the production method of the reinforcing bar that anti-seismic performance according to claim 1 is good, is characterized in that: in the 4th described step, and the temperature of cooling is 1000 ~ 1050 DEG C.
CN201510988398.9A 2015-12-27 2015-12-27 Production method of steel bar with good anti-shock property Pending CN105525204A (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102304604A (en) * 2011-08-31 2012-01-04 河北钢铁股份有限公司承德分公司 Smelting technology of III grade hot-rolled ribbed bars
CN102703812A (en) * 2012-06-27 2012-10-03 攀枝花钢城集团有限公司 Titanium microalloyed 500-MPa high-strength steel bar and production method thereof
CN102703811A (en) * 2012-06-27 2012-10-03 攀枝花钢城集团有限公司 Titanium micro-alloyed 400MPa grade high-strength steel bar and production method thereof
CN103667922A (en) * 2013-11-18 2014-03-26 首钢水城钢铁(集团)有限责任公司 Method of producing high-strength HRB400 hot-rolled ribbed bars

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102304604A (en) * 2011-08-31 2012-01-04 河北钢铁股份有限公司承德分公司 Smelting technology of III grade hot-rolled ribbed bars
CN102703812A (en) * 2012-06-27 2012-10-03 攀枝花钢城集团有限公司 Titanium microalloyed 500-MPa high-strength steel bar and production method thereof
CN102703811A (en) * 2012-06-27 2012-10-03 攀枝花钢城集团有限公司 Titanium micro-alloyed 400MPa grade high-strength steel bar and production method thereof
CN103667922A (en) * 2013-11-18 2014-03-26 首钢水城钢铁(集团)有限责任公司 Method of producing high-strength HRB400 hot-rolled ribbed bars

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Application publication date: 20160427