CN108286025A - A kind of resistance to marine corrosion reinforcing bar - Google Patents
A kind of resistance to marine corrosion reinforcing bar Download PDFInfo
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- CN108286025A CN108286025A CN201810044917.XA CN201810044917A CN108286025A CN 108286025 A CN108286025 A CN 108286025A CN 201810044917 A CN201810044917 A CN 201810044917A CN 108286025 A CN108286025 A CN 108286025A
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- steel
- reinforcing bar
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- corrosion
- marine corrosion
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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
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/04—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of bars or wire
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
-
- 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
- C22C38/18—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
- C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
Abstract
The invention discloses a kind of resistance to marine corrosion reinforcing bars and preparation method thereof, and in mass ratio, it includes：C0.10 0.15%, Si0.50 1.00%, Mn0.80 1.50%, P≤0.02%, S≤0.02%, Cr0.70 1.20%, Cu0.30 0.50%, Ni0.30 0.60%, MO0.10 0.20%, V0.05 0.08%.Reinforcing bar of the present invention has good resistance to marine environment ability.
Description
Technical field
The present invention relates to a kind of resistance to marine corrosion reinforcing bars.
Background technology
In the ocean of seriously corroded area, the average corrosion rate of common iron is about 0.5mm/a.
Current some coastal areas of the country are by the way that resistance rust liquid delay-permeating corrosion reinforcing bar is added into reinforced concrete structure
Matrix, but the chemical composition for hindering rust liquid can cause concrete life to reduce.Some domestic bridges have used on a small quantity on bridge pier surface
2205 two phase stainless steel reinforcing bars do not promoted the use of a large area because cost is high.Also some coastal engineerings, using plating
Zinc technology and epoxy resin technology, but local spot corrosion can occur for both techniques, the harmfulness bigger when local spot corrosion occurs.
Using villaumite as the corrosive environment of medium, such as ocean, coastal area, salt lake and salt-soda soil natural environment and industry
The artificial chlorine salt corrosion environment such as road, bridge of environment and spreading cryosel destroys steel due to chloride permeability to inside concrete
Muscle surface passivated membrane leads to reinforcement corrosion, and concrete cracking is caused to peel off, and reduces the service life of reinforced concrete structure.
Chlorine salt corrosion has become main corrosion factor.The infrastructure such as marine engineering equipment, capital construction build material and are in harshness
In marine environment, the etching problem of initiation is very serious.
In addition, using sea sand in housing, the premature failure of reinforced concrete structure can be caused to lead to safety accident,
If a kind of resistance to sea sand corrosion reinforcing bar of exploitation, can significantly improve the safety of concrete component and significantly reduce construction sand
Use cost.
Invention content
The present invention provides a kind of resistance to marine corrosion reinforcing bars, and which overcome the deficiencies present in reinforcing bar in background technology.
The used technical solution that the present invention solves its technical problem is：
A kind of resistance to marine corrosion reinforcing bar, in mass ratio, it includes：
C 0.10-0.15%, Si 0.50-1.00%, Mn0.80-1.50%, P≤0.02%, S≤0.02%,
Cr0.70-1.20%, Cu0.30-0.50%, Ni0.30-0.60%, MO 0.10-0.20%, V0.05-0.08%.
A kind of resistance to marine corrosion reinforcing bar above-mentioned, performance are：ReL >=500MPa, Rm >=630, ROm/ROeL≥
1.25%, ROEL/ReL≤1.30, Agt>=9.0, A >=15%.
A kind of resistance to marine corrosion reinforcing bar above-mentioned, performance meet GB/T1499.2-2007 hot rolled ribbed bars requirements.
4. a kind of preparation method of resistance to marine corrosion reinforcing bar according to claim 1, includes the following steps：
(1) steel-making, refinery practice：Using electric furnace hot metal charge technique, molten iron and steel scrap ratio are mixed up, is powered and is melted, is strong
Change oxygen supply decarburization, control slagging process, the objectionable impurities in dephosphorization, removal steel reaches tapping condition, liquid steel temperature：1630~
1650 DEG C, eccentric furnace bottom slag free tapping, alloying in ladle；It controls double deoxidizer and opportunity is added in FeV alloys；Into
LF refining station, Argon stirring, deoxidation further remove the gas and field trash in steel, improve the cleanliness factor of steel；
(2) continuous casting process：Tundish temperature controls：It opens and pours 1605-1625 DEG C of the first and second stove, stove 1575-1615 pours in company
DEG C, the good pulling rate of stability contorting in casting process ensures molten steel linking；Molding casting is sealed using whole argon；
(3) steel rolling process：Execute heating cycle, open rolling and finishing temperature control, Water cooling technique, it is ensured that rolled
The thermal uniformity of steel in journey, prevents mixed crystal or abnormal metallographic structure, at the same to ferrite and pearlite pattern and grain size into
Row is groped, and seeks best cooling transformation region, obtains ideal metallographic structure and the matching of grain size, to ensure reinforcing bar poker
Performance is stablized:
Finish to gauge speed 10-15m/s, water flow 200-480m is worn3/ h, Shui Ya≤0.8MPa, tapping temperature 1050-1180
DEG C, 890-950 DEG C of cold bed inlet temperature.
Compared with the background art, it has the following advantages that the technical program：
1, using the various specifications HRB500aE reinforcing bars of alloy production of the present invention, performance meets GB/T1499.2-2007
Hot rolled ribbed bars requirement.
2, the resistance to marine corrosion performance of reinforcing bar of the present invention is good.
Description of the drawings
The invention will be further described with reference to the accompanying drawings and examples.
Fig. 1 is No. 1 steel rusty scale surface topography and elemental analysis
(a:Surface Rust pattern；b:Surface C r distributions；c：Surface C u distributions；d：Section rusty scale pattern；e：Section Cr points
Cloth；f：Section Cu is distributed).
Fig. 2 is pattern and the elemental analysis on No. 2 steel rusty scale surfaces
(a:Surface Rust pattern；b:Surface C r distributions；c：Surface C u distributions；d：Section rusty scale pattern；e：Section Cr points
Cloth；f：Section Cu is distributed；g:Surface Ni is distributed；h：Section Ni is distributed.
Specific implementation mode
Processing technology routine of the present invention：70 tons of uhp electric arc furnaces-LF ladle refinings-tapping deoxidization alloy
Change-Argon handles -4 machines 4 stream 165 billet continuous castings-frame of regenerative walking-beam furnace -18 and wears water cooling without Continuous mill train-is turned round
But-finishing-packing-storage.
(1) steel-making, refinery practice：Using electric furnace hot metal charge technique, molten iron and steel scrap ratio each 50%, the fusing that is powered,
Enhanced oxygen blowing decarburization, controls slagging process, and the objectionable impurities in dephosphorization, removal steel reaches tapping condition (liquid steel temperature：1630
~1650 DEG C), eccentric furnace bottom slag free tapping, alloying in ladle.It controls double deoxidizer and opportunity is added in FeV alloys；Into
Entering LF refining station, Argon stirring, deoxidation further removes the gas and field trash in steel, improves the cleanliness factor of steel, and
Accurately controlling for ingredient and fine tune temperature, realization molten steel Narrow Composition Control and the degree of superheat, meets HRB500cE corrosion-resistant steel bars
Every technical property requirements.
(2) continuous casting process：Tundish temperature controls：It opens and pours 1605~1625 DEG C of the first and second stove, stove 1575~1615 pours in company
DEG C, the good pulling rate of stability contorting in casting process ensures molten steel linking.Using whole argon envelope molding casting, electromagnetic agitation, crystallizer
The technologies such as automatic liquid surface control, two cold dynamic water allocations, aerosol cooling, optimize casting parameters, improve casting blank solidification group
It knits, improves cc billet surface quality, eliminates rimhole, shrinkage cavity and loose, the high-quality, defect free slab of production.
(3) steel rolling process：Strict implement heating cycle, open rolling and finishing temperature control, Water cooling technique, it is ensured that roll
The thermal uniformity of steel during system prevents mixed crystal or abnormal metallographic structure, while to ferrite and pearlite pattern and crystal grain
Degree is groped, and seeks best cooling transformation region, obtains ideal metallographic structure and the matching of grain size, to ensure reinforcing bar
Poker characteristic is stablized.
The controlled rolling of HRB500E anti-seismic steel bars, the cold technological parameter of control are shown in Table 1.
Table 1
Using alloy production HRB500cE, production φ 22mm specifications HRB500cE is carried out with 2 batch every batch of, 3 steel billets
Reinforcing bar.
The smelting of steel billet is strictly by technology requirement, and Composition Control is in scope of design, and especially S, P control is in desirable level.
Corrosion-resistant steel bar 500cE chemical compositions (heat analysis) are shown in Table 2.
2 HRB500cE anti-seismic steel bars chemical composition (%) of table
Steel bar mechanics performance statistical conditions are shown in Table 3.As can be seen from Table 3, using the various specifications of FeV alloy productions
HRB500cE reinforcing bars, mechanical property all meet the requirement of GB/T33953-2017 standards.
3 FeV alloy production HRB500cE steel bar mechanics performances of table
In order to analyze the influence in alloy to reinforcement property.It is used in combination mechanical property to carry out regression analysis to its chemical composition.
As can be seen from Table 3, influences of the V in alloy to steel bar mechanics performance be clearly.
2, the analysis of reinforcing bar timeliness
The microalloying HRB500cE corrosion-resistant steel bar aging performances of 6 batches are tested, analysis result show (see
Table 3):Reinforcing bar all has low strain dynamic timeliness in intensity, than reducing 5~15MPa before timeliness after Rel timeliness；Rm reduces by 5
~10MPa, difference unobvious:Reinforcing bar elongation improves 4%~5% after timeliness, the reinforcing bar strong flexor ratio after timeliness and ratio in the wrong
It will more they tend to rationally.
Table 4
The corrosion resisting property for the reinforcing bar of resistance to marine environment is evaluated
5 anti-chlorine ion period soaking corrosion 72h etch rate datas of table
6 anti-chlorine ion period soaking corrosion 72h etch rate datas of table
Rusty scale pattern after simulation accelerated industrial atmospheric and rusty scale the Elemental redistribution aggregation of Cu-Mo-Cr-Ni steel
See shown in Fig. 1 and Fig. 2.The rusty scale of steel is observed using SEM, as a result, it has been found that the rusty scale of steel is obviously divided into adhesion very
Good interior rusty scale and the outer rusty scale preferably peeled off.Interior rusty scale is dense, and outer rusty scale is relatively loose.For steel alloy,
Q235 carbon steels then not dense interior rusty scale, but the single layer structure that porous adsorptivity is very poor, i.e., so-called outer rusty scale, this
Kind structure is for the no obstacle of the entrance of the SO2 in water and air so that corrosion process continues, and the rusty scale of outer rusty scale
Particle is obviously more loose than the rusty scale of Cu-Cr-Ni steel, and with crackles more more than steel alloy and hole.
In order to analyze effect of the alloying element to hindering to corrode, the mechanism of fine and close rusty scale is formed.Utilize electron probe
(EPMA) semi-quantitative analysis (Surface scan) of element has been carried out to the surface of rusty scale and interface.The outer rusty scale surface of Cu-Cr steel,
There is apparent Cr enrichment of element, rich region is presented cluster-shaped, sees Fig. 2, and Cu elements are then evenly distributed.And in rusty scale section,
Then find apparent Cu, Cr aggregation.Block distribution is presented in Cr elements, and Cu is then distributed with graininess and vermiform, and becomes rusty inside
The aggregation of layer is more.The Elemental redistribution of the steel of Cu-Cr-Ni is similar in the distribution of No. 1 steel, the difference is that 2# steel is added
Ni elements be evenly distributed on surface, do not occur significantly to be enriched with, and then content is varied from cross section, because Ni is added
It measures less, is not enriched with significantly.It can be mentioned that the enrichment of element position of two kinds of steel of comparison, it is found that element
In place of the enrichment of Cu, Cr, Ni on same position, there are the various combination of element in possible certain positions.Which demonstrate Cu, Cr,
The formation mechenism of rusty scale is that the fine and close rusty scale of the aggregation formation of element plays its corrosion proof effect of obstruction in Ni alloying elements.
Copper can significantly change the anti-air of steel and the corrosive nature of seawater, and the copper-promoted rusty scale for making steel surface is fine and close and adhesion
It improves, to further delay to corrode, when copper is added in steel jointly with phosphorus, effect is more notable.It is believed that the enrichment of Cu
Effect can be summarized as that the entrance for hindering the crystallization of rusty scale, inhibiting oxygen, to reduce the electric conductivity accomplished, deposition surface advantageous
In, hinder corrosion progress.The main function of Cr is then the structure for improving rusty scale, and cooperation Cu forms dense oxide layer,
Make surface passivation, prevents the entrance of particle oxygen.
3 rusty scales form
Table 7 is the XRD analysis table of Cu-Cr-Ni steel rusty scales, and the main component of the rusty scale is Fe3O4、α-FeOOH、γ-
FeOOH and a small amount of amorphous compound.On the whole by Cu-Cr-Ni steel is similar with the Rust Layer Structure of carbon steel, and institute is not
With the alpha-feooh of 1#, 2# steel is relatively more, and the content of Fe3O4 is relatively fewer.In the research of Yamashita et al.
It mentions, the long lasting protective rusty scale that the weathering steel containing Cr, Cu is formed mainly is made of alpha-feooh, and what is formed in a short time is then
γ-FeOOH.Loose island rock et al. was once mentioned in data, and Cu can promote alpha-feooh and amorphous Fe3O4, formation.
Different phase structures (XRD) in 7 rusty scale of table
The main function of Mo is mainly according to Mo-H2Theoretical potential-PH the figures of O systems, molybdenum can under certain polarization potential
The molybdate particle with slow releasing function is formed, the matrix surface of steel is deposited on, contributes to the corrosion rate for reducing matrix.And Ni
It is the element for improving matrix stablility, the addition of Ni can be improved the corrosion potential of matrix, increase the resistance to corrosion of matrix,
Reduce the corrosion rate of matrix.
4 conclusions
1) elemental distribution that rusty scale is analyzed by EPMA finds that the distribution of Cu, Cr show the distribution of aggregation shape, Cu
Rusty scale is in the majority within element, and Cr elements, which are then inside and outside rusty scales, all enrichment.Cu, Cr, Ni, Mo's is used cooperatively, and contributes to shape
At fine and close rusty scale, the corrosion resistance of resistance to industrial atmospheric steel is improved；
2) rusty scale is detected by XRD, mainly by the strong alpha-feooh phase composition of corrosion resistance, containing simultaneously a certain amount of
Ferroso-ferric oxide and γ-FeOOH.
3) Ni is the element for improving matrix stablility, and the addition of Ni can be improved the corrosion potential of matrix, increase matrix
Resistance to corrosion reduces the corrosion rate of matrix, therefore from the test results such as period soaking corrosion, add the ingredient of a small amount of Ni elements
2 improve the corrosion resistance of matrix.
The above, only present pre-ferred embodiments, therefore cannot limit the scope of implementation of the present invention according to this, i.e., according to
Equivalent changes and modifications made by the scope of the claims of the present invention and description all should still belong in the range of the present invention covers.
Claims (4)
1. a kind of resistance to marine corrosion reinforcing bar, in mass ratio, it includes：
C 0.10-0.15%, Si 0.50-1.00%, Mn0.80-1.50%, P≤0.02%, S≤0.02%, Cr0.70-
1.20%, Cu0.30-0.50%, Ni0.30-0.60%, MO 0.10-0.20%, V0.05-0.08%.
2. a kind of resistance to marine corrosion reinforcing bar according to claim 1, it is characterised in that：Reinforcement property meets ReL≥
500MPa, Rm>=630, RO m/RO eL>=1.25%, RO eL/ReL≤ 1.30, Agt>=9.0, A >=15%.
3. a kind of resistance to marine corrosion reinforcing bar according to claim 1, it is characterised in that：Reinforcement property meets GB/
The requirement of T1499.2-2007 hot rolled ribbed bars.
4. a kind of preparation method of resistance to marine corrosion reinforcing bar according to claim 1, includes the following steps：
(1) steel-making, refinery practice：Using electric furnace hot metal charge technique, molten iron and steel scrap ratio are mixed up, confession is strengthened in the fusing that is powered
Oxygen decarburization, controls slagging process, and the objectionable impurities in dephosphorization, removal steel reaches tapping condition, liquid steel temperature：1630~1650
DEG C, eccentric furnace bottom slag free tapping, alloying in ladle；It controls double deoxidizer and opportunity is added in FeV alloys；Into LF refining
Station, Argon stirring, deoxidation further remove the gas and field trash in steel, improve the cleanliness factor of steel；
(2) continuous casting process：Tundish temperature controls：It opens and pours 1605-1625 DEG C of the first and second stove, 1575-1615 DEG C of stove pours in company, pours
The good pulling rate of stability contorting during note ensures molten steel linking；Molding casting is sealed using whole argon；
(3) steel rolling process：Execute heating cycle, open rolling and finishing temperature control, Water cooling technique, it is ensured that in the operation of rolling
The thermal uniformity of steel prevents mixed crystal or abnormal metallographic structure, while touching ferrite and pearlite pattern and grain size
Rope seeks best cooling transformation region, obtains ideal metallographic structure and the matching of grain size, to ensure reinforcing bar poker characteristic
Stablize:
Finish to gauge speed 10-15m/s, water flow 200-480m is worn3/ h, Shui Ya≤0.8MPa, 1050-1180 DEG C of tapping temperature, cold bed
890-950 DEG C of inlet temperature.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110699595A (en) * | 2019-11-20 | 2020-01-17 | 曲靖促创科技有限公司 | Hot rolling process for reinforcing steel bar |
| 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 |
| CN111394649A (en) * | 2020-03-24 | 2020-07-10 | 鞍钢股份有限公司 | Steel for corrosion-resistant steel bar for tropical marine atmospheric environment concrete structure and production method thereof |
| CN112921213A (en) * | 2021-02-08 | 2021-06-08 | 威海海鑫新材料有限公司 | Aluminum foil blank with ultra-low pinhole count for aseptic packaging and preparation process thereof |
| CN114107840A (en) * | 2021-11-09 | 2022-03-01 | 石横特钢集团有限公司 | HRB400cE chloride ion corrosion resistant steel bar and production process thereof |
| CN114875328A (en) * | 2022-05-25 | 2022-08-09 | 湖南华菱湘潭钢铁有限公司 | Production method of 500 MPa-grade high-corrosion-resistance hot-rolled ribbed steel bar |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110699595A (en) * | 2019-11-20 | 2020-01-17 | 曲靖促创科技有限公司 | Hot rolling process for reinforcing steel bar |
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| CN111394649A (en) * | 2020-03-24 | 2020-07-10 | 鞍钢股份有限公司 | Steel for corrosion-resistant steel bar for tropical marine atmospheric environment concrete structure and production method thereof |
| CN112921213A (en) * | 2021-02-08 | 2021-06-08 | 威海海鑫新材料有限公司 | Aluminum foil blank with ultra-low pinhole count for aseptic packaging and preparation process thereof |
| CN114107840A (en) * | 2021-11-09 | 2022-03-01 | 石横特钢集团有限公司 | HRB400cE chloride ion corrosion resistant steel bar and production process thereof |
| CN114875328A (en) * | 2022-05-25 | 2022-08-09 | 湖南华菱湘潭钢铁有限公司 | Production method of 500 MPa-grade high-corrosion-resistance hot-rolled ribbed steel bar |
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