CN112458381B - Short-process 500 MPa-grade weather-resistant and earthquake-resistant reinforcing steel bar and preparation method thereof - Google Patents
Short-process 500 MPa-grade weather-resistant and earthquake-resistant reinforcing steel bar and preparation method thereof Download PDFInfo
- Publication number
- CN112458381B CN112458381B CN202011216460.XA CN202011216460A CN112458381B CN 112458381 B CN112458381 B CN 112458381B CN 202011216460 A CN202011216460 A CN 202011216460A CN 112458381 B CN112458381 B CN 112458381B
- Authority
- CN
- China
- Prior art keywords
- resistant
- steel bar
- equal
- weather
- reinforcing steel
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- 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
- C22C38/60—Ferrous alloys, e.g. steel alloys containing lead, selenium, tellurium, or antimony, or more than 0.04% by weight of sulfur
-
- 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
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
- C22C33/06—Making ferrous alloys by melting using master alloys
-
- 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
- C22C38/04—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
- C22C38/24—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
- C22C38/26—Ferrous alloys, e.g. steel alloys containing chromium with niobium or tantalum
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
A short-process 500 MPa-grade weather-resistant and earthquake-resistant reinforcing steel bar and a preparation method thereof belong to the technical field of weather-resistant reinforcing steel bars. The chemical components by mass percent are as follows: c: 0.04-0.08%, Si: 0.6-0.8%, Mn: 0.8-1.5%, P: 0.04-0.08%, S is less than or equal to 0.005%, V: 0.03 to 0.05%, Nb: 0.01-0.02%, N: 0.03 to 0.05%, Cu: 0.2-0.4%, Cr: 0.5-1.1%, Sb: 0.01-0.03%, and the balance of Fe. The process comprises the steps of converter, continuous casting, high-temperature rolling, ultra-fast cooling and phase change control cooling, the yield strength Rp0.2 of the prepared steel bar is more than or equal to 500MPa, the tensile strength Rm is more than or equal to 630MPa, the yield ratio is more than or equal to 1.25%, the elongation A% after fracture is more than or equal to 16%, the maximum total elongation is more than or equal to 9.0%, and the corrosion rate is only 0.28% and less than that of the common HRB500 under the condition of a week immersion corrosion test. The invention utilizes the existing short-flow production equipment, achieves the effect of simultaneously controlling the surface oxidation film and the microstructure of the steel bar through reasonable component design and production process control, improves the corrosion resistance, can produce the economical weather-resistant steel bar and has wide application prospect.
Description
Technical Field
The invention belongs to the technical field of weather-resistant construction steel, and particularly relates to a short-flow 500 MPa-grade weather-resistant steel bar and a preparation method thereof.
Background
Early destruction of reinforced concrete structures caused by corrosion of steel bars has become a common concern in countries throughout the century. It is reported in the United states that for bridges alone, more than half of a 57.5 million reinforced concrete bridges have steel corrosion damage, and the repair cost for the steel corrosion damage is 2500 billion dollars a year, wherein the repair cost for bridges is 1550 billion dollars, which is 4 times the initial construction cost of these bridges. Meanwhile, the reinforcing steel bars are easy to corrode, so that the bond stress of the reinforced concrete is influenced, the service performance is reduced, the service life of the building is prolonged, and the maintenance cost of the building is increased. The development and production of low-cost high-performance weather-resistant reinforcing steel bars are urgently expected for reinforced concrete of houses, ports and the like. As a result of investigation on wharves in south China by units such as traffic departments and the like, over 80% of wharves are seriously or seriously damaged by corrosion of reinforcing steel bars, and the time from the construction of the damaged wharves is only 5-10 years, so that serious economic loss is caused.
The research, development and popularization and application of the corrosion-resistant steel bar variety per se in China are relatively laggard, and no corrosion-resistant steel bar suitable for the situation of China is applied in batches at present. In order to meet the requirements of sustainable development in China and the current situation of relative shortage of resources, the market has urgent needs for developing short-process weather-resistant and earthquake-resistant reinforcing steel bars.
The basic technical conditions of corrosion-resistant steel bars should include the following aspects: (1) high corrosion resistance; (2) the requirement of fatigue performance is met; (3) good welding performance; (4) proper strength and plasticity proportion; (5) and proper shock resistance. Reasonable chemical components play an important role in the performance of the steel bar, and the effect of each element in steel is comprehensively considered, so that the steel bar not only can meet the requirements of strength and plasticity, but also needs to meet the requirement of corrosion resistance. In addition, the proper process route is beneficial to the reinforcing steel bar to obtain an ideal metallographic structure, so that the strength and the shock resistance are ensured, the corrosion resistance is improved, and a satisfactory product quality performance index is obtained. However, the alloy proportions used by various manufacturers at present are different, and the adopted steel smelting, casting and heat treatment process methods also lack certain rationality.
For example, the chinese patent 201310496370 discloses a corrosion-resistant steel bar with low cost and high performance and a method for manufacturing the same, wherein the alloy components adopt higher Cr content, and molten iron pre-desulfurization and external refining are adopted, which is not favorable for cost control, but not favorable for seismic performance evaluation, and does not reach the strength level of the steel bar of 500 MPa.
For example, the chinese invention patent CN202010028734 discloses a corrosion resistant steel bar with low cost and high performance and a manufacturing method thereof, which adopts higher carbon content and is not beneficial to welding, and simultaneously, the method combines external refining and control cooling, and is not beneficial to on-site operation and cost control.
Therefore, aiming at the short-flow production process of converter smelting, continuous casting and controlled cooling production, the production process of the 500 MPa-grade weather-proof and earthquake-proof reinforcing steel bar is developed, and the production process has important significance for the industrial development of the weather-proof and earthquake-proof reinforcing steel bar in China.
Disclosure of Invention
In order to solve the problems, the invention aims to provide a short-flow 500 MPa-grade weather-resistant reinforcing steel bar and a preparation method thereof, which adopt the technical route of converter + continuous casting + high-temperature rolling + ultra-fast cooling + phase change control cooling, and obtain a 500 MPa-grade weather-resistant and shock-resistant reinforcing steel bar finished product through reasonable component design and reasonable continuous casting and rolling process parameters.
The invention specifically adopts the technical scheme that:
a short-process 500 MPa-grade weather-resistant and earthquake-resistant reinforcing steel bar comprises the following chemical components in percentage by mass: c: 0.04-0.08%, Si: 0.6-0.8%, Mn: 0.8-1.5%, P: 0.04-0.08%, S is less than or equal to 0.02%, V: 0.03 to 0.05%, Nb: 0.01-0.02%, N: 0.03 to 0.05%, Cu: 0.2-0.4%, Cr: 0.5-1.1%, Sb: 0.01-0.0 percent, and the balance of Fe. The alloy elements have the following functions:
C. si and Mn are strengthening elements, for corrosion-resistant steel containing chromium, because the affinity of C and Cr is strong, the content of C which is too high can reduce the content of Cr in solid solution, thus leading to the reduction of corrosion resistance, the content of C is selected to be 0.04-0.08% in the invention, and the content of Si is controlled to be 0.6-0.8% and the content of Mn is controlled to be 0.8-1.5% in consideration of strengthening action and welding action.
P, Cu: the combination of P and Cu can obviously enhance the corrosion resistance of steel, but the steel is easy to generate serious segregation phenomenon, and the content of P in the invention is controlled to be 0.04-0.08%. Cu is a corrosion resistant element and contributes to the improvement of the corrosion resistance of steel, but excessive Cu in steel causes the reduction of the plasticity of the material, resulting in hot rolling cracking. In the invention, the Cu content is controlled to be 0.2-0.4%.
V: 0.03 to 0.05%, Nb: 0.01-0.02%, N: 0.03-0.05 percent, and the combination of the three elements and the reasonable proportion can simultaneously ensure the strength, the toughness and the yield ratio of the steel bar.
Cr: cr is a corrosion resistant element and can obviously increase the corrosion resistance of steel, but Cr is a ferrite forming element, and the content of ferrite in the steel can be increased due to excessively high Cr content, so that the strength is reduced, a quenched structure appears, and the structure control is not facilitated. In the invention, the Cr content is controlled to be 0.5-1.1%.
A preparation method of a short-process 500 MPa-grade weather-resistant and shock-resistant reinforcing steel bar adopts the production processes of converter, continuous casting, high-temperature rolling, ultra-fast cooling and phase change control cooling to prepare a 500 MPa-grade weather-resistant and shock-resistant reinforcing steel bar finished product according to the following chemical composition design scheme.
The production process of the steel bar comprises the steps of converter, continuous casting, high-temperature rolling, ultra-fast cooling and phase change control cooling, so that the production rhythm can be remarkably accelerated, and the field operation and the cost control are facilitated.
The chemical composition design scheme comprises the following components in percentage by mass: c: 0.04-0.08%, Si: 0.6-0.8%, Mn: 0.8-1.5%, P: 0.04-0.08%, S is less than or equal to 0.005%, V: 0.03 to 0.05%, Nb: 0.01-0.02%, N: 0.03 to 0.05%, Cu: 0.2-0.4%, Cr: 0.5-1.1%, Sb: 0.01-0.03%, and the balance of Fe;
before converter tapping, 2.0kg/t of manganese nitride alloy is added to the bottom of a steel ladle in advance, and after the converter tapping, 1.0kg/t of silicon nitride alloy cored wire is fed into the steel ladle; the manganese nitride alloy has large specific gravity and the silicon nitride has small specific gravity, and the comprehensive adding mode can play roles in strengthening the nitrogen increasing effect and ensuring the nitrogen content.
Further, in the steel rolling process, the heating temperature is controlled to be 1200 +/-30 ℃, the initial rolling temperature is controlled to be 1050 +/-30 ℃, the final rolling temperature is controlled to be 1070 +/-30 ℃, the steel is rapidly cooled to 850 ℃ at the speed of 500 plus one second/second after rolling, and then the steel enters a heat-preservation cooling bed, and the cooling speed is controlled to be 1.0-2.0 ℃/second and is cooled to be 400 ℃.
The steel rolling heating is carried out at 1200 +/-30 ℃, enough alloy elements Nb and V are guaranteed to be re-dissolved in a matrix, the later precipitation strengthening effect is achieved, the initial rolling temperature is controlled at 1050 +/-30 ℃, the final rolling temperature is controlled at 1070 +/-30 ℃, the whole rolling process is completed in a recrystallization zone, the requirement of low-temperature rolling on the power of a rolling mill is avoided, the steel is rapidly cooled to the phase transformation area after rolling, the coarsening of crystal grains caused by overlong retention in an austenite recrystallization zone is avoided, meanwhile, the cooling is controlled to be 1.0-2.0 ℃ before the phase transformation, the steel is cooled to 400 ℃, precipitates are more favorably precipitated at medium and low temperatures, and the strengthening effect is achieved.
Furthermore, the yield strength Rp0.2 of the finished weather-resistant and earthquake-resistant steel bar is more than or equal to 500MPa, the tensile strength Rm is more than or equal to 630MPa, the elongation A% after fracture is more than or equal to 16%, the total elongation of the maximum force is more than or equal to 9.0%, and the corrosion rate is only 0.28% and less than that of the common HRB500 under the condition of the weekly immersion corrosion test.
Compared with the prior art, the invention has the following beneficial effects:
the existing equipment for preparing the short-flow reinforcing steel bar is utilized, reinforcing and anti-seismic design of the reinforcing steel bar is completed through reasonable nitrogen increase, and the effects of simultaneously controlling an oxide film and a microstructure on the surface of the reinforcing steel bar are achieved through reasonable proportioning of Cu, Cr and Sb and combination of ultra-fast cooling control and phase change cooling control processes, so that the corrosion resistance is improved, the economical weather-resistant reinforcing steel bar can be produced, and the method has a very wide popularization and application space in China. Under the condition of the week immersion corrosion test, the corrosion rate is only 0.28 percent and less than that of the common HRB 500.
Detailed Description
The present invention will be described in further detail with reference to specific embodiments.
The weight percentage contents of the components of the steel bars of examples 1-8 and comparative examples 1-8 of the invention are shown in table 1.
TABLE 1 weight percentages of components of reinforcing bars of examples 1-8 and comparative examples 1-8
The production process of converter, continuous casting, high-temperature rolling, ultra-fast cooling and phase change control cooling is adopted in the embodiment 1-8, the production process of converter, continuous casting and common steel bars is adopted in the comparative example 1-8, and the steel bars are 14-32mm in specification. The key production process parameters are shown in table 2.
TABLE 2 Key production Process parameters for examples 1-8 and comparative examples 1-8
The mechanical properties and corrosion resistance of examples 1 to 8 and comparative examples 1 to 8 are shown in Table 3. The weekly leaching test uses an initial concentration of (1.0 + -0.05) × 10-2mol/L NaHSO3The solution has a pH of 4.4-4.8 and adopts 2.0 x 102mol/L NaHSO3The solution is used as a supplementing solution, the test temperature is 70 +/-2 ℃, the test humidity is 70 +/-5% RH, the cycle period is set to be 60min, the soaking time is 12min, the highest temperature of the surface of the sample after baking is 70 +/-10 ℃, the dry-wet alternate soaking test is carried out, and the corrosion rate is calculated by a weight loss method.
TABLE 3 mechanical and Corrosion resistance Properties of examples 1 to 8 and comparative examples 1 to 8
In conclusion, by comparing the examples 1 to 8 with the comparative examples 1 to 8, the yield strength Rp0.2, the tensile strength Rm and the elongation percentage after fracture A of the finished weather-resistant and earthquake-resistant reinforcing steel bar prepared by the production method are more than or equal to 500MPa, more than or equal to 630MPa, more than or equal to 16 percent and more than or equal to 9.0 percent of the maximum total elongation percentage; under the condition of the weekly immersion corrosion test, the corrosion rate is only 0.28 percent and below of that of the common HRB 500; the method has the advantages that the existing production equipment of the short-flow steel bar is utilized, reinforcement and anti-seismic design of the steel bar are completed through reasonable nitrogen increase, and the effects of simultaneously controlling the surface oxidation film and the microstructure of the steel bar are achieved through reasonable proportioning of Cu, Cr and Sb and combination of ultra-fast cooling control and phase change cooling control, so that the corrosion resistance is improved, the economical weather-resistant steel bar can be produced, and the method has a very wide popularization and application space in China.
Finally, it is noted that the above examples and comparative examples are only intended to illustrate the technical solutions of the present invention and are not intended to limit, and although the present invention has been described in detail by the above preferred embodiments, those skilled in the art will understand that various changes in form and detail can be made therein without departing from the scope of the present invention defined by the claims.
Claims (1)
1. The short-process 500 MPa-level weather-resistant and earthquake-resistant reinforcing steel bar is characterized in that the reinforcing steel bar comprises the following chemical components in percentage by mass: c: 0.04-0.08%, Si: 0.6-0.8%, Mn: 0.8-1.5%, P: 0.04-0.08%, S is less than or equal to 0.005%, V: 0.03 to 0.05%, Nb: 0.01-0.02%, N: 0.03 to 0.05%, Cu: 0.2-0.4%, Cr: 0.5-1.1%, Sb: 0.01-0.03%, and the balance of Fe;
the short-process 500 MPa-grade weather-resistant and earthquake-resistant reinforcing steel bar is prepared by the following preparation method: according to the chemical composition design scheme, a 500 MPa-grade weather-resistant and shock-resistant reinforcing steel bar finished product is prepared by adopting the production processes of converter, continuous casting, high-temperature rolling, ultra-fast cooling and phase change control cooling;
before tapping of a converter, 2.0kg/t of manganese nitride alloy is added to the bottom of a steel ladle in advance, and when one third of converter tapping is finished, 2.0kg/t of silicon nitride alloy cored wires are fed into the steel ladle;
in the steel rolling process, the heating temperature is controlled to be 1200 +/-30 ℃, the initial rolling temperature is controlled to be 1050 +/-30 ℃, the final rolling temperature is controlled to be 1070 +/-30 ℃, the steel is rapidly cooled to 850 ℃ at the speed of 500-600 ℃/s after the steel rolling is finished, and then the steel enters a heat-preservation cooling bed, and the cooling speed is controlled to be 1.0-2.0 ℃/s and is cooled to be 400 ℃;
the yield strength Rp0.2 of the finished weather-resistant and earthquake-resistant reinforcing steel bar is more than or equal to 500MPa, the tensile strength Rm is more than or equal to 630MPa, the elongation A% after fracture is more than or equal to 16%, the maximum force total elongation is more than or equal to 9.0%, and the corrosion rate is only 0.28% of that of the ordinary HRB500 and less under the condition of a week immersion corrosion test.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011216460.XA CN112458381B (en) | 2020-11-04 | 2020-11-04 | Short-process 500 MPa-grade weather-resistant and earthquake-resistant reinforcing steel bar and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011216460.XA CN112458381B (en) | 2020-11-04 | 2020-11-04 | Short-process 500 MPa-grade weather-resistant and earthquake-resistant reinforcing steel bar and preparation method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112458381A CN112458381A (en) | 2021-03-09 |
| CN112458381B true CN112458381B (en) | 2022-04-19 |
Family
ID=74835434
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011216460.XA Active CN112458381B (en) | 2020-11-04 | 2020-11-04 | Short-process 500 MPa-grade weather-resistant and earthquake-resistant reinforcing steel bar and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112458381B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114807785B (en) * | 2022-06-28 | 2022-11-18 | 江苏省沙钢钢铁研究院有限公司 | 390 MPa-grade corrosion-resistant steel plate and production method thereof |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000073139A (en) * | 1998-08-26 | 2000-03-07 | Nkk Corp | Steel for bolt excellent in sulfuric acid corrosion resistance |
| CN101177760A (en) * | 2007-11-27 | 2008-05-14 | 湖南华菱湘潭钢铁有限公司 | High-strength shipbuilding section and production method thereof |
| CN103842538A (en) * | 2011-09-29 | 2014-06-04 | 杰富意钢铁株式会社 | Hot-rolled steel sheet and method for producing same |
| CN103834871A (en) * | 2014-03-19 | 2014-06-04 | 武汉钢铁(集团)公司 | 500MPa-level corrosion-resistant Cr-contained reinforcing steel bar and rolling process thereof |
| CN107653423A (en) * | 2017-08-31 | 2018-02-02 | 武汉钢铁有限公司 | The water of resistance to coal erosion corrosion steel plate and its manufacture method for jimmy |
| CN110117754A (en) * | 2019-05-20 | 2019-08-13 | 北京科技大学 | A kind of yield strength 500MPa grades resistant to many dielectric corrosion steel and preparation method thereof |
| CN110832099A (en) * | 2017-06-30 | 2020-02-21 | 杰富意钢铁株式会社 | Structural steel and structure |
| CN111101071A (en) * | 2020-02-25 | 2020-05-05 | 湖南华菱涟源钢铁有限公司 | High-strength weathering steel and production method thereof |
-
2020
- 2020-11-04 CN CN202011216460.XA patent/CN112458381B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000073139A (en) * | 1998-08-26 | 2000-03-07 | Nkk Corp | Steel for bolt excellent in sulfuric acid corrosion resistance |
| CN101177760A (en) * | 2007-11-27 | 2008-05-14 | 湖南华菱湘潭钢铁有限公司 | High-strength shipbuilding section and production method thereof |
| CN103842538A (en) * | 2011-09-29 | 2014-06-04 | 杰富意钢铁株式会社 | Hot-rolled steel sheet and method for producing same |
| CN103834871A (en) * | 2014-03-19 | 2014-06-04 | 武汉钢铁(集团)公司 | 500MPa-level corrosion-resistant Cr-contained reinforcing steel bar and rolling process thereof |
| CN110832099A (en) * | 2017-06-30 | 2020-02-21 | 杰富意钢铁株式会社 | Structural steel and structure |
| CN107653423A (en) * | 2017-08-31 | 2018-02-02 | 武汉钢铁有限公司 | The water of resistance to coal erosion corrosion steel plate and its manufacture method for jimmy |
| CN110117754A (en) * | 2019-05-20 | 2019-08-13 | 北京科技大学 | A kind of yield strength 500MPa grades resistant to many dielectric corrosion steel and preparation method thereof |
| CN111101071A (en) * | 2020-02-25 | 2020-05-05 | 湖南华菱涟源钢铁有限公司 | High-strength weathering steel and production method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN112458381A (en) | 2021-03-09 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101935809B (en) | High performance rare-earth duplex stainless steel alloy material and preparation method thereof | |
| EP3159424B1 (en) | Rebar and preparation method thereof | |
| CN100455692C (en) | High-strength weathering steel and method of manufacturing same | |
| CN104711493B (en) | Nickel-saving type contains rare earth and barium diphase stainless steel alloy material and preparation method thereof | |
| CN113186472B (en) | Corrosion-resistant steel bar and production method thereof | |
| CN106555123B (en) | A kind of corrosion-resistant high yield ratio anti-seismic steel bar and its production method | |
| CN105886902A (en) | 400MPa-level vanadium-containing anti-seismic anti-corrosion rebar and production method thereof | |
| KR20190134529A (en) | Austenitic stainless steel alloys for high-performance tracked vehicles and method for manufacturing the same | |
| CN101407893B (en) | High strength, high heat input welding property, fire resistant and earthquake resistant steel for construction and production method thereof | |
| CN100540709C (en) | A kind of vanadium high-strength corrosion-resistant steel bar steel and production technique thereof of containing | |
| CN113832321B (en) | Aluminum-treated high-corrosion-resistance steel bar for 500 MPa-grade ocean island concrete engineering and production method thereof | |
| CN111057812A (en) | High-toughness fire-resistant corrosion-resistant steel with 600MPa tensile strength and manufacturing method thereof | |
| CN107502835A (en) | A kind of weather-proof angle steel of steel tower high-strength and high ductility and preparation method thereof | |
| CN112458381B (en) | Short-process 500 MPa-grade weather-resistant and earthquake-resistant reinforcing steel bar and preparation method thereof | |
| CN104313486A (en) | Atmospheric corrosion-resistant steel and production process thereof | |
| CN109881121B (en) | Chloride ion corrosion-resistant high-strength anti-seismic reinforcing steel bar and production method and application thereof | |
| CN111187977A (en) | 690 MPa-grade anti-seismic, corrosion-resistant and fire-resistant medium-thickness plate steel and manufacturing method thereof | |
| CN110952035A (en) | High-strength low-carbon low-alloy steel for buildings and preparation process thereof | |
| CN112941412A (en) | Production method of extra-thick 550 MPa-grade anti-seismic and weather-resistant steel | |
| CN104357745B (en) | A kind of composite reinforcing steel bar of yield strength >=600MPa and production method | |
| CN114672732A (en) | Cr-Ni steel bar and production process thereof | |
| CN111057968B (en) | Corrosion-resistant hot-rolled steel plate for street lamp pole and preparation method thereof | |
| CN106636897A (en) | Low alloy weathering steel, and preparation method and application thereof | |
| CN114657447A (en) | Rare earth-containing corrosion-resistant hot-rolled ribbed steel bar | |
| CN110747410A (en) | Corrosion-resistant bar used under acidic condition and manufacturing method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |