CN111394649A - Steel for corrosion-resistant steel bar for tropical marine atmospheric environment concrete structure and production method thereof - Google Patents
Steel for corrosion-resistant steel bar for tropical marine atmospheric environment concrete structure and production method thereof Download PDFInfo
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 76
- 239000010959 steel Substances 0.000 title claims abstract description 76
- 239000010935 stainless steel Substances 0.000 title claims abstract description 27
- 239000004567 concrete Substances 0.000 title claims abstract description 20
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 10
- 239000000126 substance Substances 0.000 claims abstract description 6
- 239000012535 impurity Substances 0.000 claims abstract description 4
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 4
- 229910052802 copper Inorganic materials 0.000 claims abstract description 3
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 3
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 3
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 3
- 238000010438 heat treatment Methods 0.000 claims description 4
- 238000005096 rolling process Methods 0.000 claims description 4
- 238000005098 hot rolling Methods 0.000 claims description 3
- 229910052750 molybdenum Inorganic materials 0.000 claims description 3
- 229910001562 pearlite Inorganic materials 0.000 claims description 2
- 229910000859 α-Fe Inorganic materials 0.000 claims description 2
- 238000005260 corrosion Methods 0.000 abstract description 46
- 230000007797 corrosion Effects 0.000 abstract description 45
- 238000003466 welding Methods 0.000 abstract description 13
- 229910000975 Carbon steel Inorganic materials 0.000 abstract description 8
- 229910045601 alloy Inorganic materials 0.000 abstract description 8
- 239000000956 alloy Substances 0.000 abstract description 8
- 239000011150 reinforced concrete Substances 0.000 abstract description 8
- 239000010962 carbon steel Substances 0.000 abstract description 4
- 239000000463 material Substances 0.000 abstract description 4
- 230000002035 prolonged effect Effects 0.000 abstract description 2
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 7
- 229910052804 chromium Inorganic materials 0.000 description 5
- 239000011159 matrix material Substances 0.000 description 4
- 238000002161 passivation Methods 0.000 description 4
- 229910001220 stainless steel Inorganic materials 0.000 description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- 238000005728 strengthening Methods 0.000 description 3
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 239000004593 Epoxy Substances 0.000 description 1
- 229910001335 Galvanized steel Inorganic materials 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
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- 239000003822 epoxy resin Substances 0.000 description 1
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- 238000010297 mechanical methods and process Methods 0.000 description 1
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- 150000001247 metal acetylides Chemical class 0.000 description 1
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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
-
- 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
- C22C38/20—Ferrous alloys, e.g. steel alloys containing chromium 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
- C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium 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
- C22C38/24—Ferrous alloys, e.g. steel alloys containing chromium with vanadium
-
- 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
- C22C38/28—Ferrous alloys, e.g. steel alloys containing chromium with titanium or zirconium
-
- 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
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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
-
- 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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Abstract
The invention discloses a corrosion-resistant steel bar for a tropical marine atmospheric environment concrete structure and a production method thereof, belonging to the technical field of corrosion-resistant materials. The steel bar comprises the following chemical components in percentage by weight: c: 0.16 to 0.21%, Si: 0.35-0.65%, Mn: 0.70-1.20%, P: less than or equal to 0.030 percent, S: less than or equal to 0.030 percent, Cr: 0.40-1.00%, Cu is less than or equal to 0.35%, Ni: less than or equal to 0.45 percent; mo: 0.10 to 0.20%, Ti: less than or equal to 0.025 percent, V: 0.030-0.050%, N is less than or equal to 0.0080%, and the balance is Fe and inevitable impurities. A small amount of alloy elements are added on the basis of the carbon steel bar, and the novel steel bar with excellent corrosion resistance is obtained by optimizing the content and proportion of the alloy elements. The steel for the corrosion-resistant steel bar meets the requirements of mechanical property and welding property of a tropical marine atmospheric environment concrete structure, the corrosion resistance of the steel is 2-4 times that of HRB400E steel bar, and the durability of the reinforced concrete structure can be effectively prolonged.
Description
Technical Field
The invention belongs to the field of corrosion-resistant materials, and relates to steel for corrosion-resistant steel bars for a concrete structure in a tropical marine atmospheric environment and a production method thereof.
Background
The steel bar plays a skeleton supporting role in a concrete structure, is a main common material in the prior engineering building materials, and is widely applied in the industrial and civil building fields of houses, sea-crossing bridges, highways and the like. The theoretical service life of the reinforced concrete is long, but in actual engineering, a plurality of cases of early failure of the reinforced concrete exist, so that the maintenance cost is increased, and the great waste of energy and resources is caused. According to statistics, the concrete peeling phenomenon can occur after the concrete structure of the inland civil buildings in China is used for 15-25 years; however, the phenomenon of steel bar corrosion and peeling occurs in civil buildings in coastal areas after about 10 years of use, and the reason for the phenomenon is caused by the difference of regional environmental conditions. The climate conditions in thailand are more severe than those in China, and the requirement on the durability of the reinforced concrete structure is higher. In order to prolong the durability of the reinforced concrete structure in the tropical marine atmospheric environment, the corrosion resistance of the reinforced parent metal is mainly solved. Therefore, the development of steel bars with high corrosion resistance becomes a hot point of concern in the engineering world at home and abroad.
At present, the protection technology for improving the corrosion resistance of steel bars at home and abroad mainly comprises two major categories, namely (1) steel bars with plated layers on the surfaces, namely, a protective coating is added on the surfaces of the steel bars, a steel matrix is separated from a corrosive medium, so that the corrosion resistance of the steel bars is reduced, 2) matrix corrosion resistant steel bars, namely, a certain amount of alloy elements are added into common steel bars, so that the corrosion resistance of the steel bar matrix is improved, 201020574823.2, namely, an improved structure of epoxy steel bars is disclosed, wherein a galvanized layer is firstly plated on the steel bars by a chemical method, then a layer of epoxy resin coating is plated on the layer by a physical method, the corrosion resistance of the steel bars is stronger due to double protection effects, however, the galvanized layer on the surfaces of the galvanized steel bars is fast in corrosion resistance, the corrosion resistance is limited in improvement and difficult in welding, 201510549858, a preparation method for preparing a stainless steel bar with chlorine ion corrosion resistance, wherein the corrosion resistance of the stainless steel bar is developed, the corrosion resistance of the stainless steel bar is 316L, but contains 2.0 to 8.0% of Cr and 1.50%, the alloy elements of the steel bars, 2.03, the alloy elements of the.
Based on the reasons, the novel corrosion-resistant steel bar product which has excellent chloride ion corrosion resistance and relatively low manufacturing cost is developed, and has wide application prospect.
Disclosure of Invention
In order to solve the problems, the invention provides steel for corrosion-resistant reinforcing steel bars for tropical marine atmospheric environment concrete structures and a production method thereof.
The invention provides steel for corrosion-resistant steel bars for a tropical marine atmospheric environment concrete structure, which comprises the following chemical components in percentage by weight: c: 0.16 to 0.21%, Si: 0.35-0.65%, Mn: 0.70-1.40%, P: less than or equal to 0.030 percent, S: less than or equal to 0.030 percent, less than or equal to 0.35 percent of Cu, less than or equal to 0.45 percent of Ni, and the weight ratio of Mo: 0.10 to 0.20%, Cr: 0.40 to 1.00%, Ti: less than or equal to 0.025 percent, V: 0.030-0.050%, N is less than or equal to 0.0080%, and the balance is Fe and inevitable impurities.
A production method of steel for corrosion-resistant steel bars for a concrete structure in a tropical marine atmospheric environment comprises the following steps: the molten steel is cast to obtain a billet, and then the billet is hot-rolled into a sheet with a certain thickness. And in the hot rolling process, the heating temperature of the steel blank is 1050-1150 ℃, and the heating time is 1.5-2 h. The initial rolling temperature in the hot rolling process is 1000-1100 ℃, and the final rolling temperature is 900-1000 DEG C
Further, the metallographic structure of the steel for reinforcing steel bars is ferrite and pearlite.
Further, the steel for the steel bar has yield strength Rel: 420-470 MPa, tensile strength Rm: 530-680 MPa, elongation after break A: 22-32% total elongation Agt：10～16％。
The steel bar of the invention has the following components:
the high and low content of C can directly influence the strength of the steel bar. Too high carbon content increases the strength and hardness of the steel bar and decreases the plasticity and toughness. In an alkaline environment, for the steel bar containing Cr and Cr, the Cr content in solid solution steel can be influenced by the C content which is too high, and the formation of a passive film on the surface of the steel bar is influenced, so the C content is controlled within the range of 0.16-0.21 percent.
The main function of Si is to perform deoxidation and strengthening, when the content of Si is high, welding materials are wasted in the welding process, and the quality of a welding seam is also influenced; when the content of Si is low, the content of oxygen in the steel bar is high, and more inclusions are generated, so that the content of Si is controlled within the range of 0.35-0.65%.
The content of Mn has a significant influence on the welding performance. When the Mn content is lower, the residual oxygen content in the steel bar is higher, so that the corrosion rate is increased; when the content of Mn is higher, the strength and the hardness of the steel bar are increased, the weldability is poor, and a large amount of inclusions appear in a welding seam, so that the content of Mn is controlled within the range of 0.70-1.20% in the invention.
S, P as impurity element in the steel bar, when the content of P element in the steel bar is too high, the low temperature mechanical property and welding property of the steel bar are poor; when the content of the S element is too high, FeS and MnS inclusions are easily formed, and the corrosion resistance of the steel bar is reduced, so that the content of P is controlled to be less than or equal to 0.030 percent, and the content of S is controlled to be less than or equal to 0.030 percent.
Cr can improve the density of a passive film on the surface of the steel bar and improve the corrosion resistance. In the concrete, Cr can participate in the formation of a passivation film, the formed Cr-rich double-layer passivation film has good compactness, and the corrosion resistance of a steel bar matrix is improved; when the content of the Cr element in the steel bar is too high, on one hand, the production cost of the steel bar is increased, on the other hand, the welding performance is poor, and the corrosion resistance of a welding seam is insufficient, so that the Cr content is controlled within the range of 0.40-1.00 percent.
Mo plays a role in improving pitting corrosion resistance and crevice corrosion resistance in steel. The higher the content is, the stronger the pitting corrosion resistance of the steel bar is; since too high Mo content deteriorates the oxidation resistance of steel, resulting in increased steel strength and lowered weldability, the Mo content is controlled within the range of 0.10 to 0.20% in the present invention.
Mo and Cr have a synergistic effect, Mo and C can form fine carbides, the combination of C and Cr is hindered, the passivation effect of Cr is improved, and Cr is promoted to form a compact passivation film; mo combines with Cr to improve the corrosion resistance of the steel bar.
Ti can react with oxygen to reduce the inclusion in the reinforcing steel bar. The plasticity and the toughness of a welding joint can be ensured in the welding process, and cracking of the steel bar after welding and cold bending is avoided, so that the Ti content is controlled within the range of less than or equal to 0.025 percent.
V belongs to microalloy strengthening elements, can play a role in precipitation strengthening, has a certain grain refining effect, and can obviously improve the strength of steel, so that the content of V is controlled within the range of 0.030-0.050%.
The invention has one or more of the following advantages and beneficial effects:
(1) the steel for the corrosion-resistant steel bar has the advantages of low alloy element content, simple production process, high cost performance and strong operability, and is suitable for large-scale popularization and use of enterprises.
(2) Compared with stainless steel bars and coated steel bars, the corrosion-resistant steel bar has the advantages that the steel for the steel bar can reduce the construction cost, remarkably prolong the service life of a building and reduce the later maintenance cost.
(3) The corrosion-resistant steel bar and the common carbon steel bar are subjected to periodic infiltration experiments and atmospheric exposure experiments at the same time, and the results show that the corrosion-resistant steel bar has low corrosion rate and the corrosion resistance 2-4 times that of the common carbon steel bar.
Drawings
FIG. 1 is a metallographic structure diagram of an example of the present invention.
FIG. 2 is a macroscopic corrosion topography of 4 steel bars after removing the wrapping concrete according to the embodiment.
Detailed Description
The corrosion-resistant steel bar is prepared by adding a small amount of alloy elements on the basis of the components of common carbon steel according to the industrial standard of 'corrosion-resistant steel bar for reinforced concrete', and obtaining three novel corrosion-resistant steel bars by optimizing the content and proportion of the alloy elements.
The weight percentage contents of the chemical components of the newly designed three corrosion-resistant steel bars and the plain carbon steel bar are shown in table 1. The metallographic structure of the steel bar sample is shown in figure 1.
Table 1 weight percent contents (wt.%) of the chemical components of the three reinforcing bars
And (3) performing an on-site atmospheric exposure test according to the standard GB11112-89, wherein the prepared reinforced concrete sample is exposed in coastal areas of Thailand for seven months. Stripping concrete and corrosion products on the surface of the steel bar sample exposed in a certain period by a mechanical method, and calculating the corrosion rate by adopting the formula (1):
wherein V represents the weight loss corrosion rate and has the unit of mm/y; w0Represents the weight of the sample before corrosion, and the unit is g; w1Represents the weight in g after removal of corrosion products; s represents the surface area of the steel bar sample in cm2(ii) a t represents the corrosion time in h; ρ represents the density of the sample in g/cm3。
After the corrosion rate values of the four steels are calculated, the relative corrosion rate is calculated by using the following formula (2):
wherein, CHAs relative corrosion rate, ViCorrosion rates of 1#, 2# and 3# steel bars; v4Is the corrosion rate of No. 4 plain carbon steel reinforcing steel bars.
Table 2 four steel bar coupon corrosion test results
As can be seen from Table 2, the corrosion rates of the No. 1, No. 2 and No. 3 steel bars are reduced compared with those of plain carbon steel bars in the same exposure time, wherein the corrosion rate of the No. 1 steel bar is the lowest, which shows that the corrosion-resistant steel bar of the invention has excellent corrosion resistance.
In conclusion, the corrosion-resistant steel bar for concrete structure prepared according to the requirements of the invention satisfies yield strength Rel: 420-470 MPa, tensile strength Rm: 560 to 630MPa, elongation after break A: 22-32% total elongation Agt: 10-16%; compared with the industrial plain carbon steel reinforcing steel bar, the corrosion resistance of the reinforcing steel bar is improved by 2-4 times, and the durability of a reinforced concrete structure can be effectively prolonged, so that the reinforcing steel bar can be suitable for a tropical marine atmospheric environment concrete structure.
Claims (4)
1. The corrosion-resistant steel bar for the tropical marine atmospheric environment concrete structure is characterized by comprising the following chemical components in percentage by weight: c: 0.16 to 0.21%, Si: 0.35-0.65%, Mn: 0.70-1.20%, P: less than or equal to 0.030 percent, S: less than or equal to 0.030 percent, Cr: 0.40-1.00%, Cu is less than or equal to 0.35%, Ni is less than or equal to 0.45%, Mo: 0.10 to 0.20%, Ti: less than or equal to 0.025 percent, V: 0.030-0.050%, N is less than or equal to 0.0080%, and the balance is Fe and inevitable impurities.
2. The method for producing the corrosion-resistant steel bar for the concrete structure in the tropical marine atmospheric environment according to claim 1, wherein the molten steel is cast to obtain a steel billet, and then the steel billet is hot-rolled to form the ribbed steel bar, the heating temperature of the steel billet in the hot rolling process is 1050-1150 ℃, the heating time is 1.5-2 h, the initial rolling temperature is 1000-1100 ℃, and the final rolling temperature is 900-1000 ℃.
3. The corrosion-resistant steel bar for the concrete structure in the tropical marine atmospheric environment according to claims 1 and 2, wherein the metallographic structure of the steel for the steel bar is ferrite and pearlite.
4. The corrosion-resistant steel bar for a concrete structure in a tropical marine atmosphere according to claims 1 and 2, wherein the yield strength R of the steel for steel barel: 420-470 MPa, tensile strength Rm: 530-680 MPa, elongation after break A: 22-32% total elongation Agt：10～16％。
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Cited By (3)
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| CN111893388A (en) * | 2020-08-07 | 2020-11-06 | 阳春新钢铁有限责任公司 | Corrosion-resistant steel bar and production process thereof |
| CN112599209A (en) * | 2020-12-03 | 2021-04-02 | 南京钢铁股份有限公司 | Weather-resistant steel design method based on corrosion map |
| CN114196884A (en) * | 2021-12-13 | 2022-03-18 | 芜湖新兴铸管有限责任公司 | 400 MPa-grade microalloyed corrosion-resistant reinforcing steel bar and production method thereof |
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| CN114196884A (en) * | 2021-12-13 | 2022-03-18 | 芜湖新兴铸管有限责任公司 | 400 MPa-grade microalloyed corrosion-resistant reinforcing steel bar and production method thereof |
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