CN107723603A - Yield strength 500MPa levels corrosion-resistant steel bar and manufacture method - Google Patents
Yield strength 500MPa levels corrosion-resistant steel bar and manufacture method Download PDFInfo
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- CN107723603A CN107723603A CN201711223245.0A CN201711223245A CN107723603A CN 107723603 A CN107723603 A CN 107723603A CN 201711223245 A CN201711223245 A CN 201711223245A CN 107723603 A CN107723603 A CN 107723603A
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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
-
- 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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with 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
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
-
- 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
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Abstract
The present invention discloses a kind of yield strength 500MPa levels corrosion-resistant steel bar and manufacture method, belongs to corrosion-resisting steel technical field for building.The chemical composition weight percent of the reinforcing bar is：C：0.05~0.10%, Si：0.30~0.60%, Mn：1.20~1.50%, Cr：1.00~1.50%, Ni：0.10~0.20%, Cu：0.20~0.40%, Mo：0.10~0.20%, V：0.06~0.10%, Ti：0.010~0.025%, P≤0.035%, S≤0.010%, surplus are Fe and inevitable residual impurities element.The present invention makes full use of the synergy between individual element and element to improve the decay resistance of reinforcing bar by adding a small amount of alloying element.The manufacture method of the reinforcing bar is routinely to smelt and cast, and cooling controlling and rolling controlling process is then used on bar mill.Precious metal element content is few in reinforcing bar of the present invention, reinforcing bar obdurability, weldability and corrosion resistance excellent, resources conservation, and production cost is low.
Description
Technical field：
The invention belongs to corrosion-resisting steel technical field for building, more particularly to yield strength 500MPa levels corrosion-resistant steel bar and system
Make method.
Background technology：
Because Chloride Attack causes the case of concrete structure premature failure to be widely present under marine environment, cause huge
Economic loss.At present, highway with the Devoting Major Efforts To Developing at China South Sea, the hot and humid high salt in the South Sea and using deicer salts etc.
Service Environment, higher requirement it is also proposed to the durability of reinforced concrete structure.The corrosion of reinforcing bar not only substantially reduces
The bulk life time of building, also result in potential safety hazard.The use of corrosion-resistant steel bar is to prevent that reinforced concrete structure is rotten because of reinforcing bar
Lose and last one of barrier of premature failure.Therefore, the decay resistance of reinforcing bar turns into the focus that domestic and international project circle is paid close attention to and asked
Topic.
At present, the measure of steel bar anti-corrosion mainly has painting/coating reinforcing bar, FRP tendons and stainless reinforcing bar etc..Common painting/coating
Reinforcing bar mainly has epoxy-coated reinforcement and Hot Dip Galvanized Rebar, and wherein epoxy-coated reinforcement is using relatively broad.Found in practice,
Often there is heavy damage, the spot corrosion of reinforcing bar in coated reinforcement coat film in transport, carrying, colligation and pouring concrete construction
By the even more serious decline that can cause armored concrete overall durability on the contrary.FRB muscle also has more clearly disadvantageous, main body
Now with concrete poor bonding strength, shear strength is low, modulus of elasticity is low and heat endurance is poor etc., mixed in high intensity
Using more difficult in Xtah Crude Clay structure；In addition, FRP material itself durability will be under the environment such as temperature, moisture, alkali, acid, salt
Largely have influence on the durability of FRP reinforced concrete structures.Stainless reinforcing bar contains the alloy member such as a large amount of valuable Cr, Ni
Element, make its production cost apparently higher than normal carbon reinforcing bar, it is about identical using the disposable input cost of the engineering of stainless reinforcing bar
4-6 times of rank normal carbon reinforcing bar, largely limit application of the stainless reinforcing bar in concrete structure.
Chinese patent CN103834871A discloses the corrosion-resistant Li-adding Al alloy muscle of 500MPa levels and its rolling mill practice, the reinforcing bar
Although in 5%NaCl solution during salt air corrosion, its corrosion resisting property is 4~6 times of common HRB500 reinforcing bars, is contained in reinforcing bar
There is 8~10% Cr, alloying element is higher, and cost is higher, is unfavorable for resources conservation；Such high Cr contents and relatively low simultaneously
C content, existing reinforcing bar smelting process is difficult to meet to require, Cr elements quenching degree is higher in addition, even if so high Cr contents
Slow cooling can also generate martensitic structure, and using conventional rebar production technology, its performance is extremely difficult to require.Chinese patent literature
CN106756518A discloses a kind of 500MPa levels corrosion-resistant steel bar and production method, chemical composition quality percentage in the reinforcing bar
Content is：C：0.16~0.20%, Si：0.30~0.50%, Mn：1.10~1.30%, V：0.07~0.09%, S≤
0.03%th, P≤0.03%, Cu：0.30~0.40%, Cr：0.8~1.0%, although reinforcing bar cost of alloy is relatively low, reinforcing bar
In be not added with suppressing element Nis of the Cu in surface checking, casting billet surface easily forms the quality and corrosion resisting property of cracks influence product；
Other C element is higher, Cr contents are relatively low, is easy to occur local corrosion (spot corrosion defect etc.) now under dry and wet week leaching etching condition
As.Chinese patent literature CN105950989A discloses a kind of anti-corrosion reinforcing bar and production method, and the reinforcing bar chemical composition is：C：
0.15~0.23%, Si：0.30~0.65%, Mn：0.90~1.60%, P≤0.03%, S≤0.03%, Cr：1.40~
2.50%th, Cu：0.20~0.40%, Ti：0.010~0.025%, N≤0.015%, O≤0.0020%, in the reinforcing bar not
Addition suppresses element Nis of the Cu in surface checking, and casting billet surface easily forms the quality and corrosion resisting property of cracks influence product；Due to
N content is higher in reinforcing bar, and Ti combines to form TiN particles with Ti first at high temperature, therefore is tied by limited Ti to suppress Cr and C
Close, and then inhibiting point corrosion phenomenon is limited in one's ability, its spot corrosion is difficult to avoid that with local corrosion.
Therefore on the basis of existing wide variety of 500MPa levels high tensile reinforcement, with reference to existing reinforcing bar production technology, adopt
Designed with resource-conserving alloy, improve the decay resistance of reinforcing bar, improve the service life of building and reduce later maintenance
Cost, the popularization to anti-corrosion reinforcing bar have broad application prospects with being of great significance using tool.
The content of the invention：
For problem above, it is an object of the invention to provide a kind of yield strength 500MPa levels corrosion-resistant steel bar and its system
Make method.The present invention sets about in terms of improving reinforcing bar inherent quality and improving local corrosion, passes through alloying component and production technology
Design, on the premise of a large amount of alloys are not added, there is relatively excellent resistance to Cl-Environmental corrosion performance.Meanwhile its mechanical property
The performance indications requirement of 500MPa levels reinforcing bar in GB1499-2007 can be met with welding performance, production cost is low, process operability
By force, it is adapted to large-scale popularization to use.
A kind of yield strength 500MPa levels corrosion-resistant steel bar provided by the present invention includes following count by weight percentage
Composition：C：0.05~0.10%, Si：0.30~0.60%, Mn：1.20~1.50%, Cr：1.00~1.50%, Ni：0.10~
0.20%, Cu：0.20~0.40%, Mo：0.10~0.20%, V：0.06~0.10%, Ti：0.010~0.025%, P≤
0.035%, S≤0.010%, surplus are Fe and inevitable residual impurities element.
The alloy mentality of designing of the present invention is on the basis of C, Si, Mn, carries out precipitation strength by using V and improves reinforcing bar
Intensity, improve the corrosive nature (especially point corrosion) of reinforcing bar using Cr, Ni, Cu, Mo, using micro Ti come crystal grain thinning
It is as follows with improving welding property, the specific effect of its alloying element：
C：Carbon be improve steel strength directly, economic and effective element, but too high C content can reduce the modeling of reinforcing bar
Property, toughness and corrosive nature, it is too high because C and Cr affinity are stronger particularly with the relatively low corrosion resisting steel of chromium content
C content can reduce solid solution Cr contents, influence the formation of passivating film, cause the reduction of corrosion resisting property.To ensure the synthesis of reinforcing bar
Performance, the present invention in C content scope elect as：0.05~0.10%.
Si：Element silicon mainly plays deoxidation and invigoration effect in steel, also has necessarily to improving inoxidizability and corrosion resistance
Effect.When silicone content is too high, it can harden weld metal during welding, increase of splashing, influence welding technological properties；When in steel
When silicone content is too low, deoxidation is incomplete, and oxygen content is too high in steel.So Si contents are controlled 030~0.60% in the present invention
Within the scope of.
Mn：Manganese is also the essential element for effectively improving reinforced steel bar strength, and strong with S affinity, by generate manganese sulfide come
Suppress the harm of sulphur；Manganese is also Strengthening and Toughening element important in steel simultaneously, and when manganese content is low, oxygen content in steel is higher, corrosion
Performance reduces.Other Mn improves rusty scale of the steel in the corrosion later stage in steel with Cu synergies, so as to slow down the further corruption of steel
Erosion.But too high manganese can increase the segregation tendency and quenching degree of steel, so its content can not be too high.Therefore it is of the invention by Mn contents
Control is within the scope of 1.20~1.50%.
Cr：Chromium is to improve corrosion proof important element in steel, can make one layer of cause of Surface Creation of steel under certain condition
Close passivating film, shields to steel matrix；When containing a large amount of chromiums in steel, it on the one hand can substantially increase the production of steel
Cost, the quenching degree of steel on the other hand can be dramatically increased, reduce the plasticity and weldability of steel；For inland deicer salts highway with away from
For the coastal building of ocean off sea farther out, its corrosion resistance to reinforcing bar requires relatively lower.Therefore it is of the invention by Cr content controls
System is within the scope of 1.00~1.50%.
Cu：Copper can significantly improve the decay resistance of reinforcing bar, while Mn and Cu synergy further improves the resistance to Cl- of steel
Corrosive nature；But steel, because the fusing point of copper is low and not oxidizable, easily forms tortoise when melting is with heating in surface enrichment
Split phenomenon.Therefore Cu content ranges are elected as in the present invention：0.20~0.40%.
Ni：Nickel element has certain anti-corrosion capability, and nickel is added in steel can not only make the corrosion potential of steel to pros
To movement, but also it can be enriched with rusty scale and hinder Cl-To matrix permeability, so as to improve the corrosion resistance of steel；Simultaneously pass through to
The Ni of 1/2Cu contents is added in steel, Cu crack performance can be avoided；But Ni belongs to precious metal element, so the present invention will
Ni contents are controlled within the scope of 0.10~0.20%.
Mo：The notable crystal grain thinning of molybdenum energy, improves strength and toughness；Mo is in middle low-temperature zone slow cooling and drawing process simultaneously
So as to hinder C and Cr combination, Cr passivation effect can be improved, reduce the spot corrosion tendency of steel with C-shaped into tiny carbide；
But Mo belongs to precious metal element, so the present invention controls Mo contents within 0.10~0.20%.
V：Vanadium can separate out vanadium carbide nitride after reinforcing bar rolling, have stronger precipitating reinforcing effect, while can also hinder
Ferrite crystal grain is grown up, and has certain Grain refinement, can significantly improve the intensity of steel.But V belongs to precious metal element,
So the present invention controls V content within 0.06~0.10%.
Ti：On the one hand titanium fixes N element in steel in steel, it is within reason to form austenite crystal when TiN can make heating steel billet
Grow up, refine the tissue of steel；Simultaneously weld seam can also be hindered to be grown up with heat affected area crystal grain under the hot conditions of welding, ensure weldering
The plasticity and toughness of joint, ftracture after avoiding reinforcement welding clod wash.But Ti too high levels, can have to the High Temperature Ductility of steel
Adverse effect.So the present invention controls Ti contents within 0.010~0.025%.
P：P elements can improve the intensity and corrosion resisting property of steel, but easily occur segregation phenomena in steel, while low temperature
Mechanical property is poor.So the present invention controls P content≤0.035%.
S：When sulphur generates FeS in steel, easily cause the hot-short phenomenon of steel, the generation of crackle caused in the operation of rolling,
MnS is mingled with the origin that will also become corrosion in steel simultaneously, serious to reduce steel corrosion resisting property, so S weight percents of the present invention contain
Amount control is ≤0.010%.
The present invention also provides a kind of manufacture method of yield strength 500MPa level corrosion-resistant steel bars, and the manufacture method is using normal
Rule are smelted and casting, and cooling controlling and rolling controlling process is used on bar mill.
The cooling controlling and rolling controlling process is：Continuous casting square billet is heated to 1100~1200 DEG C, 1~2h is incubated, makes alloying element
Fully solid solution；Roughing, in roll temperature for 900~950 DEG C, finishing temperature is 800~850 DEG C, temperature on cooling table control 750~
850℃。
Carry out treating temperature before roughing, roughing, in roll in TAgainRolled in the range of+(30~50) DEG C, to refine original austenite grain
Size, TAgainFor recrystallization temperature；In roll water cooling used between mm finishing mill unit, rolled immediately after water cooling, on the one hand roll finish rolling
Temperature processed is in Unhydrated cement rolling, thinning microstructure.
There are two kinds of techniques after upper cold bed：Reinforcing bar to room temperature, is then heated to 300 by Direct Air-Cooled after cold bed in a kind of technique
~400 DEG C, 1~2h is incubated, carries out temper；Another technique is air-cooled to 450~600 first to carry out air cooling after upper cold bed
DEG C when enter holding pit or using stacking slow cooling.
Compared with prior art, the present invention uses resource-conserving composition design, in the design process from composition and tissue
Angle improve local corrosion (spot corrosion) phenomenon, to improve reinforcing bar later stage corrosion rate；Comprehensively utilize refined crystalline strengthening, solid solution by force
Change, phase transformation strengthening and precipitation strength improve the Strengthening and Toughening effect of reinforcing bar；Controlled Rolling And Controlled Cooling is used on common bar mill,
500MPa level corrosion-resistant steel bars are produced, steel bar mechanics performance meets GB1499.2-2007 requirements, its yield strength ReL≥
500MPa, tensile strength Rm>=630MPa, elongation A% >=15%；Its resistance to Cl-Corrosive nature under dry and wet corrosion mal-condition
For more than 1.5 times of HRB500.Reinforcing bar of the present invention carries out appropriate reconstruction on existing common bar mill to be produced, and invest
Few, simple production process is workable.Alloy content is few, and production cost is low, economizes on resources, and the reinforcing bar tool produced
There are higher plasticity and excellent weldability.Not only can be in coastal building using the 500MPa levels corrosion-resistant steel bar of the present invention
Use, can also be used in inland north deicer salts highway structure；For stainless reinforcing bar and coated reinforcement, the reinforcing bar is used
Building cost can be not only reduced, is also greatly improved the service life of building, reduces later maintenance expense.
Following examples be premised on technical solution of the present invention under implemented, give detailed embodiment and tool
The operating process of body, but protection scope of the present invention is not limited to following embodiments.Method therefor is as without especially in following embodiments
Explanation is conventional production process.
Embodiment：
Embodiment 1：Chemical composition (mass percent) C of steel：0.056%, Si：0.50%, Mn：1.25%, Cr：
1.35%, Ni：0.15%, Cu：0.32%, Mo：0.13%, V：0.065%, Ti：0.022%, P：0.02%, S≤0.01%,
Surplus is iron and inevitable impurity.
Embodiment 2：Chemical composition (mass percent) C of steel：0.075%, Si：0.35%, Mn：1.48%, Cr：
1.08%, Ni：0.19%, Cu：0.40%, Mo：0.12%, V：0.08%, Ti：0.014%, P：0.025%, S≤0.01%,
Surplus is iron and inevitable impurity.
Embodiment 3：Chemical composition (mass percent) C of steel：0.07%, Si：0.56%, Mn：1.22%, Cr：
1.47%, Ni：0.10%, Cu：0.20%, Mo：0.13%, V：0.08%, Ti：0.02%, P：0.03%, S≤0.01%, it is remaining
Measure as iron and inevitable impurity.
Embodiment 4：Chemical composition (mass percent) C of steel：0.084%, Si：0.44%, Mn：1.30%, Cr：
1.26%, Ni：0.14%, Cu：0.29%, Mo：0.20%, V：0.09%, Ti：0.025%, P：0.018%, S≤0.01%,
Surplus is iron and inevitable impurity.
Embodiment 5：Chemical composition (mass percent) C of steel：0.096%, Si：0.52%, Mn：1.40%, Cr：
1.38%, Ni：0.19%, Cu：0.40%, Mo：0.16%, V：0.10%, Ti：0.018%, P：0.024%, S≤0.01%,
Surplus is iron and inevitable impurity.
Table 1 is the specific rolling technological parameter of the embodiment of the present invention, and table 2 is the rolling specs and mechanics of the embodiment of the present invention
Performance.
The 1-5 of the embodiment of the present invention of table 1 rolling technological parameter
The 1-5 of the embodiment of the present invention of table 2 rolling specs and mechanical property
Wherein：ReLFor yield strength；RmFor tensile strength；A is the elongation after fracture under 5d gauge lengths.
According to YB/T4367-2014 reinforcing bars, corrosion tests perform in chloride environment, are selected according to GB/T1266
Sodium chloride chemical reagent.
Testing liquid is 3.5% NaCl solution, and experimental facilities is Jie Ruier period soaking corrosion test boxes, solution temperature
For 35 ± 2 DEG C, drying temperature is 45 ± 2 DEG C, and humidity is 70% ± 10%RH in case.Each cycle period is 60 ± 5min, its
Middle 12 ± 2min of infiltrating time, 48 ± 2min of open-assembly time.Sample is cylinder, and every group of parallel sample is no less than 5.Experiment is prolonged
The continuous time is 72h, and corrosion resistance evaluation, 1-5 of the embodiment of the present invention and the corrosion for contrasting reinforcing bar are carried out according to the rate of corrosion of sample
As a result it is as shown in table 3.
The weight-loss ratio and relatively corrosive speed of the 1-5 of the embodiment of the present invention of table 3 and contrast reinforcing bar
Above example shows, produced corrosion resistant is controlled by the Design of Chemical Composition of the present invention, rolling mill practice production
Lose the mechanical property of reinforcing bar and decay resistance substantially optimizes common HRB500 reinforcing bars, and resistance to severe dry and wet alternate-immersion
Property is more than 1.5 times of conventional H RB500 reinforcing bars, can be applied to inland north deicer salts highway structure and offshore structures.
Claims (6)
1. yield strength 500MPa level corrosion-resistant steel bars, it is characterised in that the corrosion-resistant steel bar includes count by weight percentage
Following component：C：0.05~0.10%, Si：0.30~0.60%, Mn：1.20~1.50%, Cr：1.00~1.50%, Ni：
0.10~0.20%, Cu：0.20~0.40%, Mo：0.10~0.20%, V：0.06~0.10%, Ti：0.010~
0.025%, P≤0.035%, S≤0.010%, surplus are Fe and inevitable residual impurities element.
2. the manufacture method of yield strength 500MPa level corrosion-resistant steel bars described in claim 1, it is characterised in that the manufacture method
Smelted using conventional with casting, cooling controlling and rolling controlling process is used on bar mill.
3. manufacture method according to claim 2, it is characterised in that the cooling controlling and rolling controlling process is：Continuous casting square billet is heated
To 1100~1200 DEG C, be incubated 1~2h, roughing, in roll temperature for 900~950 DEG C, finishing temperature is 800~850 DEG C, upper cold
Bed tempertaure is controlled at 750~850 DEG C.
4. manufacture method according to claim 3, it is characterised in that carry out treating temperature before roughing, roughing, in roll in TAgain+(30
~50) rolled in the range of DEG C, TAgainFor recrystallization temperature；In roll water cooling used between mm finishing mill unit, rolled immediately after water cooling.
5. manufacture method according to claim 3, it is characterised in that Direct Air-Cooled is to room temperature after upper cold bed, then by reinforcing bar
300~400 DEG C are heated to, is incubated 1~2h, carries out temper.
6. manufacture method according to claim 3, it is characterised in that first carry out air cooling after upper cold bed, be air-cooled to 450~600
DEG C when enter holding pit or using stacking slow cooling.
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| CN108286025A (en) * | 2018-01-17 | 2018-07-17 | 福建三宝钢铁有限公司 | A kind of resistance to marine corrosion reinforcing bar |
| CN108774711A (en) * | 2018-06-05 | 2018-11-09 | 马鞍山钢铁股份有限公司 | A kind of armored concrete economical 500MPa grades of seawater corrosion resistance reinforcing bar and its production method |
| CN108774711B (en) * | 2018-06-05 | 2019-10-01 | 马鞍山钢铁股份有限公司 | A kind of armored concrete economical 500MPa grades of seawater corrosion resistance reinforcing bar and its production method |
| CN110951953A (en) * | 2019-12-20 | 2020-04-03 | 福建三宝钢铁有限公司 | HRB500E steel bar and vanadium-nitrogen microalloying process thereof |
| CN110983188A (en) * | 2019-12-26 | 2020-04-10 | 福建三宝钢铁有限公司 | Marine atmosphere corrosion resistant steel bar and production process thereof |
| CN110983188B (en) * | 2019-12-26 | 2021-01-29 | 福建三宝钢铁有限公司 | Marine atmosphere corrosion resistant steel bar and production process thereof |
| CN114672724A (en) * | 2022-02-21 | 2022-06-28 | 长沙东鑫环保材料有限责任公司 | Rare earth and nitrogen microalloyed molybdenum-containing HRB500E disc spiral steel bar and production method thereof |
| CN114672724B (en) * | 2022-02-21 | 2023-03-10 | 长沙东鑫环保材料有限责任公司 | Rare earth and nitrogen microalloyed molybdenum-containing HRB500E disc spiral steel bar and production method thereof |
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