CN105950989B - A kind of anti-corrosion reinforcing bar and its production method - Google Patents

A kind of anti-corrosion reinforcing bar and its production method Download PDF

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CN105950989B
CN105950989B CN201610340629.XA CN201610340629A CN105950989B CN 105950989 B CN105950989 B CN 105950989B CN 201610340629 A CN201610340629 A CN 201610340629A CN 105950989 B CN105950989 B CN 105950989B
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steel
molten steel
slag
tundish
reinforcing bar
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CN105950989A (en
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姜利
刘亚辉
姜铁鑫
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Haicheng Xin Rui Casting Co Ltd
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Haicheng Xin Rui Casting Co Ltd
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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
    • C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/10—Supplying or treating molten metal
    • B22D11/11—Treating the molten metal
    • B22D11/116—Refining the metal
    • 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
    • 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
    • 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
    • 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
    • C22C38/16—Ferrous alloys, e.g. steel alloys containing copper
    • 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

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Treatment Of Steel In Its Molten State (AREA)

Abstract

A kind of anti-corrosion reinforcing bar and its production method, chemical composition：C 0.15~0.23%, Si0.30~0.65%, Mn0.90~1.60%, P≤0.030%, S≤0.020%, Cr1.40~2.50%, Cu0.20~0.40%, Ti0.010~0.025%, N≤0.015%, O≤0.0020%.1650~1670 DEG C of electric induction furnace smelting tapping temperature.The degree of superheat of Steel Melt for Continuous Casting is controlled at≤30 DEG C；Deoxidation is carried out using extra electric field slag device for deoxidizing to tundish, the voltage of extra electric field is 5~20V, and electric current is 600~1000A, improves the cleanliness factor of molten steel.Rolling steel billet heating-up temperature is 1130~1170 DEG C, 1.5~2.5h of heat time, 1000~1100 DEG C of start rolling temperature, and finishing temperature is 950~1050 DEG C.Reinforcing bar Rel >=500MPa of the present invention, Rm >=630MPa, A >=15%, corrosion resisting property are 3~5 times of HRB500c steel grade rolling concrete steel bars.

Description

A kind of anti-corrosion reinforcing bar and its production method
Technical field
The invention belongs to metallurgical technology technical field, the more particularly to a kind of reinforcing bar and its producer of marine climate resistant corrosion Method.
Background technology
Steel and iron industry is the basic industries of China's economic development, and economic development be unable to do without the support of the heavy industry such as steel.Together When improve constantly the development level of steel and iron industry, also for meet the various aspects of national economic modernization construction as machinery, The basic premise of the industry requirements such as building, national defence, communications and transportation.In recent years, the output of steel in China has ranked the first in the world, and is generation Big steel country of boundary.Reinforcing bar is a kind of main common used material in current engineering building materials, is widely used in industry and civil buildings, its Performance quality directly affects the quality of engineering concrete.The high speed development of China's capital construction at present, the production and use of reinforcing bar are equal It is evolving, safety of its product quality not only about every engineering cause, more has depth to living and working in peace and contentment for the people It is remote to influence.The smelting production of reinforcing bar produces very big pressure to energy environment protection, can be with by improving the corrosion resistance and intensity of reinforcing bar Extend the service life of reinforcing bar, reduce the dosage of steel, eased off the pressure for energy-conserving and environment-protective.
Steel bar corrosion is one of the principal element for influenceing reinforced concrete structure durability, and Important Project premature failure Major reason.Especially under the coupling of the distinctive adverse circumstances in ocean and dynamic load with static load multiple factors, it will cause Steel bar corrosion aggravates, and substantially reduces the service life of concrete structure.Research of the country such as the U.S., France to high strength cast iron It is more early with developing, it is also relatively more early to researchs such as atmospheric corrosion resistance container plates, but to the corrosion resistance of concrete reinforcing bars Study it is later, it is at present to be in conceptual phase more, there is no ready-made product.China Patent Publication No. CN102605255A discloses one Kind 400MPa level corrosion resisting steels, its constituent content are：C:0.1%~0.25%, Si:0.5%~0.90%, Mn:0.7%~ 1.5%, P:0.04%~0.09%, S≤0.015%, Cu:0.3%~0.6%, Ni:0.1%~0.4%, Cr≤0.1%, V:0.03%~0.08%, its decay resistance improves 2 times compared with regular reinforcement, but its room for promotion is relatively limited.
China Patent Publication No. is that CN101709434A discloses a kind of resistance to Cl-The high-strength low-alloy steel bar of corrosion, its Constituent content is C：0.08%~0.25%, Si：0.35%~1.1%, Mn：0.7%~2.0%, Cu：0.20%~ 0.80%, Cr：0.30%~1.6%, Ni：0.20%~1.0%, P：0.05%~0.10%, S≤0.010%, surplus Fe With inevitable impurity；Or while separately plus micro alloying element V, the one or more in Nb, Ti, B；Microalloy element is total Amount control (no plus titanium example in embodiment) 0.01%~0.5%, this application corrosion resisting property is still relatively low, and does not have Have and the oxygen content in steel is controlled, there is no specific requirement in terms of molten steel cleanness, be not concerned with improving the cleaning of steel Degree, reduce corrosion proof effect of the amount of inclusions to raising steel.
The content of the invention
The purpose of the present invention is intended to be greatly reduced the oxygen content in steel, reduces the field trash in steel, is being added without a large amount of conjunctions On the premise of gold, by improving the cleanliness factor of steel, so as to significantly improve the corrosion resistance of reinforcing bar.
For up to this purpose, the technical solution that the present invention is taken is：
A kind of anti-corrosion reinforcing bar, its chemical component weight degree are：C：0.15%~0.23%, Si：0.30%~ 0.65%, Mn：0.90%~1.60%, P≤0.030%, S≤0.020%, Cr：1.40%~2.50%, Cu：0.20%~ 0.40%, Ti：0.010%~0.025%, N≤0.015%, O≤0.0020%, remaining is iron and inevitable impurity.
The present invention's determines that principle is into component selections and content range：
Carbon is very important intensified element in steel, with the increase of carbon content in steel, can improve the intensity of steel and hard Degree, but the plasticity of steel and toughness can decline accordingly, and appropriate carbon is contained in anti-corrosion reinforcing bar, it is ensured that the intensity of reinforcing bar, But in the corrosion-resisting steel containing chromium, the affinity of carbon and chromium is stronger, easily formed chromium carbide, reduce steel in contained chromium it is effective Effect, thus in steel carbon content control 0.15%~0.23%.
Element silicon is main deoxidation and intensified element in steel, to improve inoxidizability and corrosion resistance also have it is certain Effect.When silicone content is too high, it can harden weld metal during welding, increase of splashing, influence welding technological properties；When silicon in steel When content is too low, deoxidation is incomplete, and oxygen content in steel is too high, therefore silicone content control is 0.30%~0.65%.
Manganese can play a part of complex deoxidization in steel with silicon, and manganese can generate manganese sulfide with sulphur, suppress the harmful of sulphur Effect, manganese Strengthening and Toughening element important simultaneously and in steel, when manganese content is low, oxygen content in steel is higher, while reinforcing bar is strong Spend relatively low；But when manganese content is too high in steel, plasticity and impact toughness decreased, while welding performance is adversely affected, therefore Manganese content is controlled 0.90%~1.60%.
P elements can improve the intensity and corrosion resisting property of steel, but easily occur segregation phenomena in steel, while during low temperature Mechanical property is poor, therefore phosphorus content control is ≤0.030%.
When sulphur generates FeS in steel, easily cause the hot-short phenomenon of steel, add manganese element generation manganese sulfide, can eliminate Hot-short influence, but the field trash such as sulfide generated, are easily formed source of corrosion in steel, thus in steel sulfur content control≤ 0.020%.
Chromium is to improve corrosion proof important element in steel, the corrosion potential of steel matrix can be improved, in certain environment Under, the surface of steel can generate the oxide-film of densification, when containing a large amount of chromiums in steel, can substantially increase the production cost of steel, In construction(al)steel field, the purposes of reinforcing bar is different, requires also different to corrosion proof, and the remote place of some of ocean distance, Will be lower to the corrosion proof requirement of reinforcing bar, therefore chromium content is controlled 1.40%~2.50% in steel.
Copper is equally to improve corrosion proof element in steel, but steel is when heating furnace is heated, because copper is not easy oxygen Change, and fusing point is relatively low, this is easy for causing steel surface copper-rich, occurs decrepitation, therefore copper content control in steel in hot rolling 0.20%~0.40%.
Titanium is a kind of stronger deoxidier, can be by oxygen removal in molten steel to extremely low level, so as to effectively improve steel The cleanliness factor of liquid, reduce the field trash in steel；Titanium elements in steel can separate out the carbon nitridation of small and dispersed when being rolled Titanium particle, play a part of good crystal grain thinning；Titanium is combined in steel with carbon, greatly reduces the machine that chromium is combined with carbon Meeting, effectively improve chromium serve it is anti-corrosion, therefore in steel Ti content control 0.010%~0.025%.
Nitrogen can play a part of solution strengthening in steel, it is possible to increase the intensity and hardness of steel, but significantly affect steel Toughness, therefore the control of nitrogen in steel content is ≤0.015%.
Oxygen is to exist in the form of the oxide in steel, and not only the performance such as the plasticity to reinforcing bar, toughness has these oxides Adverse effect, simultaneous oxidation thing has been significantly reduced corrosion resisting property, therefore oxygen content in steel control is ≤0.0020%.
A kind of production method of anti-corrosion reinforcing bar, including electric furnace smelting, continuous casting and rolling, its specific production method are：
Electric furnace smelting：
Smelted in electric induction furnace, smelt and use high-quality steel scrap, after scrap melting, carry out slag making operation, and root According to molten steel Initial Composition, it is firstly added carburant, fero-manganesesilicon, ferrosilicon and carries out deoxidation and alloying, then add ferrochrome, ferrotianium Alloying is carried out, is tapped after smelting component reaches requirement, tapping temperature is controlled at 1650~1670 DEG C.
Continuous casting：
Tap to after ladle, ladle is hung at tundish, the degree of superheat of molten steel is controlled at≤30 DEG C；Tundish is used Extra electric field slag device for deoxidizing carries out deoxidation, and on long nozzle, negative electrode is fixed on filling pipe end the anode jacket of device for deoxidizing, Anode and negative electrode are connected with the positive pole and negative pole of power supply respectively by wire；The voltage of extra electric field is 5~20V, electric current 600 ~1000A, the anode wherein outside long nozzle, when being poured into a mould, after anode enters with long nozzle in the slag of tundish, The anode to switch on power, connect negative electrode at the filling pipe end of tundish and communicated with tundish molten steel, by dc source, molten steel and in Between loop is formed between covering agent, control conduction of the oxygen in molten steel by slag system, the oxygen generated in slag arranged Go out molten steel, so as to improve the cleanliness factor of molten steel.
Rolling：
Billet heating temperature is 1130~1170 DEG C, 1.5~2.5h of heat time, 1000~1100 DEG C of start rolling temperature, eventually Temperature is rolled for 950~1050 DEG C.
Beneficial effects of the present invention are：
By adding titanium elements in steel, play a part of crystal grain thinning in steel, be distributed titanium carbonitride particle dispersion, Reduce the chance that is combined with carbon of chromium, be effectively improved chromium serve it is anti-corrosion；Titanium is also good deoxidier simultaneously, The oxygen content in steel can be greatly reduced, the field trash in steel significantly reduces, and wraps water with Con casting ladle long nozzle Deoxidation treatment is carried out plus extra electric field between mouthful, the field trash in steel is further reduced, increases being added without a large amount of alloys On the premise of production cost, the corrosion resistance of reinforcing bar can be significantly improved, extends the service life of reinforcing bar, so as to reduce the use of steel Amount.After testing, reinforcing bar produced by the invention, its yield strength Rel >=500MPa, tensile strength Rm >=630MPa, elongation of having no progeny Rate A >=15%, corrosion resisting property are 3~5 times of HRB500c steel grade rolling concrete steel bars.
Brief description of the drawings
Fig. 1 is extra electric field tundish slag device for deoxidizing installment state profile.
In figure：Anode 1, long nozzle 2, tundish 3, slag 4, molten steel 5, stopper 6, negative electrode 7, filling pipe end 8, submersed nozzle 9th, turbulator 10, dc source 11.
Embodiment
First, fabrication and installation extra electric field slag device for deoxidizing.The extra electric field slag device for deoxidizing of tundish 3 includes anode 1st, negative electrode 7 and power supply 11.Anode 1 and negative electrode 7 are cylindrical shape, and anode 1 is sleeved on long nozzle 2, and with long nozzle 2 together Down or up, negative electrode 7 is fixed on the filling pipe end 8 above submersed nozzle 9, anode 1 and negative electrode 7 by wire respectively with electricity The positive pole in source 11 connects with negative pole.
Embodiment is smelted using 20 tons of induction furnaces.Comparative example steel grade is HRB500c, using same electric furnace smelting, is used The small billet that converter-LF refining-continuous casting process is produced, rolling mill practice are identical.Embodiment and comparative example reinforcing bar chemistry into Weight percent content is divided to be shown in Table 1.
The embodiment of table 1 and comparative example reinforcing bar chemical component weight degree table (%)
Example C Si Mn P S Cr Cu Ti O N
Embodiment 1 0.17 0.58 0.95 0.018 0.014 1.42 0.23 0.012 0.0013 0.009
Embodiment 2 0.18 0.42 1.14 0.021 0.016 1.86 0.28 0.018 0.0019 0.008
Embodiment 3 0.16 0.56 1.36 0.024 0.018 1.54 0.26 0.024 0.0017 0.006
Embodiment 4 0.17 0.32 1.58 0.021 0.015 2.35 0.24 0.017 0.0018 0.008
Embodiment 5 0.17 0.61 1.47 0.018 0.012 1.93 0.23 0.019 0.0017 0.014
Embodiment 6 0.19 0.45 1.29 0.012 0.014 2.48 0.27 0.023 0.0018 0.012
Embodiment 7 0.21 0.42 1.08 0.014 0.013 1.88 0.28 0.013 0.0015 0.015
Embodiment 8 0.19 0.46 1.26 0.019 0.014 1.97 0.31 0.016 0.0018 0.010
Comparative example 1 0.22 0.65 1.45 0.018 0.015 0.063 0.28 / 0.0094 0.011
Comparative example 2 0.19 0.70 1.58 0.022 0.013 0.098 0.24 / 0.0086 0.009
Comparative example 3 0.20 0.63 1.43 0.016 0.015 0.086 0.26 / 0.0076 0.010
Comparative example 4 0.18 0.74 1.49 0.021 0.014 0.079 0.24 / 0.0069 0.009
Embodiment is smelted and the specific production method of continuous casting is：
Electric furnace smelting：
Using high-quality steel scrap, slag making operation is carried out after scrap melting, according to molten steel Initial Composition, be firstly added carburant, Fero-manganesesilicon, ferrosilicon carry out deoxidation and alloying, then add ferrochrome, ferrotianium progress alloying, treat that smelting component reaches requirement After tapped, tapping temperature control at 1650~1670 DEG C.
Continuous casting：
Tap to after ladle, ladle is hung at tundish, the degree of superheat of molten steel is controlled at≤30 DEG C.
Deoxidation is carried out using extra electric field slag device for deoxidizing to tundish 3.During cast, during long nozzle 2 is lowered into Between bag 3 in, now anode 1 is in slag 4, and the molten steel 5 in ladle is first into turbulator 10 by long nozzle 2, molten steel 5 Flowed to herein by changing, promote the ladle slag into tundish 3 to float, when the molten steel 5 in tundish 3 rises to certain height When spending, open stopper 6 and poured into a mould.Because slag 4 is conductive, in the presence of applying direct current electric field, in slag 4 from Son will be moved, and electrochemical reaction occurs at corresponding interface.Specific course of reaction is as follows：
1st, the oxygen in molten steel spreads to the interface of 5/ slag of molten steel 4：[O]Molten steel→[O]Molten steel/slag；
2nd, oxygen atom obtains electronics in the interface of 5/ slag of molten steel 4, while makes 5/ slag of molten steel, 4 interfaces positively charged：
[O]Molten steel/slag→(O2-)Molten steel/slag；
3rd, oxonium ion is in the presence of electric field, to the interfacial migration of 4/ anode of slag 1 in slag 4：
(O2-)Molten steel/slag→(O2-)Molten steel/anode；
4th, the anode reaction that oxonium ion loses electronics occurs at the interface of 4/ anode of slag 1：
(O2-)Molten steel/anode→1/2(O2-)Molten steel/anode+2e；
5th, oxygen gets into the air：
1/2(O2-)Molten steel/anode→1/2(O2-)Gas。
In course of reaction 2, the interface of 5/ slag of molten steel 4 will accumulate positive charge, the boundary of 4/ anode of slag 1 in course of reaction 4 Face will accumulate negative electrical charge, can overcome problem above by extra electric field, so that oxonium ion constantly migrates into slag 4, Reach the purpose of deoxidation.
During the processing of molten steel 5, the voltage of extra electric field is controlled in 5~20V, and current control is in 600~1000A.
When being poured into a mould, argon gas is blown into stopper 6, this position is exactly at the negative electrode 7 of extra electric field, the gas being blown into Body serves stirring action, efficiently utilizes the gas being blown at stopper 6, produces stirring action to molten steel 5, is not required to increase in addition Add blowning installation.Be advantageous to the oxygen atom in molten steel 5 to migration at the slag 4 of tundish 3, remove the oxygen in molten steel 5 more thorough Bottom.In whole casting process, the argon flow amount being blown at stopper 6 is controlled in 5l/min.By dc source, in the He of molten steel 5 Loop is formed between the coverture of tundish 3, controls the oxygen in molten steel 5 to be generated by the conduction in the system of slag 4 in slag 4 Oxygen discharge molten steel 5, so as to improve the cleanliness factor of molten steel 5.
Continuous cast billet specification is 150 × 150mm.
Rolling：Ribbed Bar specification after rolling is φ 14mm.
Embodiment and comparative example rolling technological parameter and service check result are shown in Table 2, table 3 respectively.
The embodiment of table 2 and comparative example rolling technological parameter
Example Heating-up temperature DEG C Heat time DEG C Start rolling temperature DEG C Finishing temperature DEG C
Embodiment 1 1135 1.5 1057 1012
Embodiment 2 1148 1.9 1045 1035
Embodiment 3 1169 1.8 1067 987
Embodiment 4 1136 1.7 1089 1047
Embodiment 5 1148 2.4 1025 956
Embodiment 6 1159 2.3 1020 1008
Embodiment 7 1168 1.8 1035 976
Embodiment 8 1146 1.9 1016 994
Comparative example 1 1145 2.0 1035 1007
Comparative example 2 1154 1.8 1048 984
Comparative example 3 1149 2.2 1053 996
Comparative example 4 1160 1.7 1048 1024
Table 3 rolls rear reinforcement property index test result
Example Corrosion rate micron/year Rel MPa Rm MPa A%
Embodiment 1 149 538 679 20
Embodiment 2 168 546 654 21
Embodiment 3 197 525 675 19
Embodiment 4 174 518 643 20
Embodiment 5 230 536 677 23
Embodiment 6 196 526 653 24
Embodiment 7 203 534 637 21
Embodiment 8 154 529 648 25
Comparative example 1 688 510 640 16
Comparative example 2 716 525 638 17
Comparative example 3 702 514 645 17
Comparative example 4 734 530 638 18
As seen from Table 3, the intensity of reinforcing bar of the embodiment of the present invention and elongation percentage slightly improve, but have significantly in terms of corrosion resistance Improve, the corrosion resisting property compared with comparative example HRB500c improves 3~5 times, so as to effectively extend the service life of reinforcing bar.

Claims (2)

1. a kind of anti-corrosion reinforcing bar, it is characterised in that its chemical component weight degree is：C：0.15%~0.17%, Si： 0.61%~0.65%, Mn：0.90%~1.60%, P≤0.030%, S≤0.020%, Cr：1.93%~2.50%, Cu： 0.23%~0.26%, Ti：0.012%~0.025%, N≤0.015%, O≤0.0020%, remaining is for iron and unavoidably Impurity.
2. a kind of production method of anti-corrosion reinforcing bar as claimed in claim 1, it is characterised in that including electric furnace smelting, continuous casting and roll System, its specific production method are：
Electric furnace smelting：
Smelted in electric induction furnace, smelt and use high-quality steel scrap, after scrap melting, carry out slag making operation, and according to steel Liquid Initial Composition, it is firstly added carburant, fero-manganesesilicon, ferrosilicon and carries out deoxidation and alloying, then adds ferrochrome, ferrotianium is carried out Alloying, tapped after smelting component reaches requirement, tapping temperature is controlled at 1650~1670 DEG C；
Continuous casting：
Tap to after ladle, ladle is hung at tundish, the degree of superheat of molten steel is controlled at≤30 DEG C；Tundish is used additional Electric field slag device for deoxidizing carries out deoxidation, and the anode jacket of device for deoxidizing is on long nozzle, and negative electrode is fixed on filling pipe end, anode It is connected respectively with the positive pole and negative pole of power supply by wire with negative electrode；The voltage of extra electric field is 5~20V, electric current is 600~ 1000A, the anode wherein outside long nozzle, when being poured into a mould, after anode enters with long nozzle in the slag of tundish, connect The anode in energization source, negative electrode is connect at the filling pipe end of tundish and is communicated with tundish molten steel, by dc source, in molten steel and centre Loop is formed between covering agent, controls the oxygen in molten steel to arrange the oxygen generated in slag by the conduction in slag system Go out molten steel, so as to improve the cleanliness factor of molten steel；
Rolling：
Billet heating temperature is 1130~1170 DEG C, 1.5~2.5h of heat time, 1000~1100 DEG C of start rolling temperature, finish to gauge temperature Spend for 956~1050 DEG C.
CN201610340629.XA 2016-05-19 2016-05-19 A kind of anti-corrosion reinforcing bar and its production method Expired - Fee Related CN105950989B (en)

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CN102140565A (en) * 2010-01-29 2011-08-03 上海大学 Method for pollution-free deoxygenation refining by externally applying electric field to tundish
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