CN113210419A - Corrosion-resistant HRB600E composite anti-seismic steel bar and manufacturing method thereof - Google Patents
Corrosion-resistant HRB600E composite anti-seismic steel bar and manufacturing method thereof Download PDFInfo
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/16—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling wire rods, bars, merchant bars, rounds wire or material of like small cross-section
- B21B1/163—Rolling or cold-forming of concrete reinforcement bars or wire ; Rolls therefor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B9/00—Measures for carrying out rolling operations under special conditions, e.g. in vacuum or inert atmosphere to prevent oxidation of work; Special measures for removing fumes from rolling mills
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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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- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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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
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16S—CONSTRUCTIONAL ELEMENTS IN GENERAL; STRUCTURES BUILT-UP FROM SUCH ELEMENTS, IN GENERAL
- F16S3/00—Elongated members, e.g. profiled members; Assemblies thereof; Gratings or grilles
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Abstract
The invention discloses a corrosion-resistant HRB600E composite anti-seismic steel bar, which comprises: the stainless steel corrosion-resistant outer layer is coated on the periphery of the HRB600 carbon steel core, and the stainless steel corrosion-resistant outer layer and the HRB600 carbon steel core are assembled and then are hot-rolled to form a metallurgical bonding transition layer; the thickness of the stainless steel corrosion-resistant outer layer is 0.10mm-1.50mm, the thickness of the stainless steel corrosion-resistant outer layer is 0.6% -10% of the radius of the composite steel bar, and the thickness of the metallurgical bonding transition layer is 0.02mm-0.15 mm. And discloses a manufacturing method of the corrosion-resistant HRB600E composite anti-seismic steel bar. The composite steel bar has good toughness, the bending resistance is greatly improved, and the strength is greatly improved; simultaneously, the metallurgical bonding between the inner and outer layers makes the mutual infiltration of the contact department of the two fuse and form the intermediate transition layer, thereby greatly improving the integrity of the composite reinforcing steel bar.
Description
Technical Field
The invention relates to the technical field of metal materials and composite steel, in particular to a corrosion-resistant HRB600E composite anti-seismic steel bar and a manufacturing method of the corrosion-resistant HRB600E composite anti-seismic steel bar.
Background
The proportion of the application amount of the high-strength steel bars in China to the total use amount of the steel bars is improved from 35% in 2011 to about 70%, about 1000 million tons of the steel bars can be saved each year, 1600 million tons of iron ore, 600 million tons of standard coal and 4100 million tons of water are correspondingly reduced, and 2000 million tons of carbon dioxide and sewage discharge amount and 1500 million kilograms of dust are simultaneously reduced. The high-strength steel bars are adopted in the concrete structure, so that good social and economic benefits are obtained. However, at present, 400MPa steel bars are mainly used in China, and after the steel bars are released in reinforced concrete design Specifications (GB50010-2010) in 2010, the 500MPa steel bars are widely applied. Compared with the strength of the steel bar in developed countries in the west, the strength of the steel bar used in China is still lower than that of the steel bar in developed countries in the west, wherein the strength of the steel bar is generally between 500 and 700 MPa.
Compared with HRB400E grade steel bars mainly used at present, the HRB600E (HRB is hot rolled ribbed steel bars) can save the steel consumption by 44.4 percent; meanwhile, the popularization and application of the high-strength steel bars can also obtain huge indirect economic benefits, such as solving the problem of fat beams and fat columns in building structures. Meanwhile, with the increasing importance of people on the safety performance and service life of the building facilities, higher requirements are also put forward on the steel materials. Therefore, the research and development of the high-strength anti-seismic steel bar with high strength and good comprehensive performance is a necessary trend of steel enterprises for coping with the development of the future reinforced concrete structure in the field of building engineering.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a corrosion-resistant HRB600E composite anti-seismic steel bar and a manufacturing method of the corrosion-resistant HRB600E composite anti-seismic steel bar, wherein the corrosion-resistant HRB600E composite anti-seismic steel bar simultaneously has excellent corrosion resistance of stainless steel and high strength of low-carbon steel or low-alloy steel, and the composite anti-seismic steel bar has good toughness and elongation after fracture by compounding the corrosion-resistant HRB600E composite anti-seismic steel bar and the low-carbon steel or the low-alloy steel, so that the requirement of the anti-seismic steel bar is met; according to the manufacturing method of the corrosion-resistant HRB600E composite anti-seismic steel bar, the end part sealing is carried out in a vacuum environment, so that the inner layer and the outer layer of the corrosion-resistant HRB600E composite anti-seismic steel bar are completely prevented from being oxidized in the hot rolling process, and the metallurgical bonding between the inner layer and the outer layer is tighter. In order to solve the problems, the technical scheme of the corrosion-resistant HRB600E composite anti-seismic steel bar provided by the invention is as follows:
the invention relates to a corrosion-resistant HRB600E composite anti-seismic steel bar, which comprises: the stainless steel corrosion-resistant outer layer is coated on the periphery of the HRB600 carbon steel core, and the stainless steel corrosion-resistant outer layer and the HRB600 carbon steel core are assembled and then are hot-rolled to form a metallurgical bonding transition layer; the thickness of the stainless steel corrosion-resistant outer layer is 0.10mm-1.50mm, the thickness of the stainless steel corrosion-resistant outer layer is 0.6% -10% of the radius of the composite steel bar, and the thickness of the metallurgical bonding transition layer is 0.02mm-0.15 mm.
Compared with the composite steel bar in the prior art, the corrosion-resistant HRB600E composite anti-seismic steel bar has the advantages that each layer can play specific performance by adopting the combination structure of the outer layer corrosion-resistant stainless steel and the inner layer carbon steel core, namely, the corrosion-resistant HRB600E composite steel bar has good corrosion resistance and high toughness by the outer layer corrosion-resistant stainless steel pipe, and is suitable for various complex application scenes, such as engineering of construction under seawater and engineering in alpine regions; the composite anti-seismic steel bar has high strength and good toughness through the internal carbon steel core, the bending resistance is greatly improved, and the strength is greatly improved; meanwhile, the metallurgical bonding between the inner layer and the outer layer ensures that the contact part of the inner layer and the outer layer is mutually permeated and fused to form an intermediate transition layer, so that the composite anti-seismic steel bar obtains good elongation after fracture, the overall performance of the composite steel bar is greatly improved, and the standard requirement of the anti-seismic steel bar is met.
As an improvement of the corrosion-resistant HRB600E composite anti-seismic steel bar, the corrosion-resistant outer layer of the stainless steel is made of a stainless steel pipe, and 2205, 304, 316 or 316L is selected as the stainless steel material of the corrosion-resistant outer layer of the stainless steel; the HRB600 carbon steel core is made of carbon steel or low alloy steel, and the components of the HRB600 carbon steel core comprise 0.10-0.30 wt% of C, 0.20-0.80 wt% of Si, 1.00-2.25 wt% of Mn and 0.05-0.15 wt% of V.
Furthermore, the outer surface of the stainless steel corrosion-resistant outer layer is provided with an inclined rib structure, and the inclined rib structure is welded or riveted on the outer surface of the stainless steel corrosion-resistant outer layer; or the inclined rib structure and the stainless steel corrosion-resistant outer layer are of an integrally formed structure.
Furthermore, an inverted rib structure extends inwards from the inner surface of the stainless steel corrosion-resistant outer layer, the inner surface of the stainless steel corrosion-resistant outer layer extends inwards through hot rolling, and the inward extending height of the inverted rib structure is 0.01mm-0.03 mm.
The invention discloses a manufacturing method of a corrosion-resistant HRB600E composite anti-seismic steel bar, which comprises the following steps:
firstly, manufacturing a stainless steel corrosion-resistant outer layer and an HRB600 carbon steel core according to a preset size, and performing impurity removal and decontamination cleaning treatment on the inner surface of the stainless steel corrosion-resistant outer layer and the outer surface of the HRB600 carbon steel core; and then assembling the stainless steel corrosion-resistant outer layer and the HRB600 carbon steel core to obtain the stainless steel-carbon steel composite billet.
Step two, the assembled stainless steel-carbon steel composite billet is placed into vacuum packaging equipment, then the vacuum packaging equipment is vacuumized, air between the stainless steel corrosion-resistant outer layer and the HRB600 carbon steel core is removed, the vacuum degree is smaller than or equal to 0.001MPa, and the tail end of the stainless steel-carbon steel composite billet is welded and sealed in the vacuum packaging equipment; when the stainless steel-carbon steel composite billet is welded and sealed at the tail end, one end of the stainless steel-carbon steel composite billet can be sealed, and the two ends of the stainless steel-carbon steel composite billet can be simultaneously sealed.
And step three, heating the welded and sealed stainless steel-carbon steel composite billet in a billet heating furnace to 1050-1150 ℃ for 1-3 hours to ensure that the inside and outside temperature of the stainless steel-carbon steel composite billet is uniform.
And step four, discharging the heated stainless steel-carbon steel composite billet out of the furnace, performing hot rolling, controlling the initial rolling temperature to be more than 950 ℃, controlling the final rolling temperature to be not less than 750 ℃, and obtaining the corrosion-resistant HRB600E composite anti-seismic steel bar after multiple hot rolling processes according to the designed size and shape.
Further, after the fourth step, the prepared corrosion-resistant HRB600E composite anti-seismic steel bar further comprises a cooling step: and (3) cooling the corrosion-resistant HRB600E composite steel bar water inlet tank after the corrosion-resistant HRB600E composite steel bar water outlet from the hot rolling mill with water penetration, and controlling the temperature of the corrosion-resistant HRB600E composite steel bar after the water penetration cooling to be 550-950 ℃.
Further, in the fourth step, the hot rolling pass of the stainless steel-carbon steel composite billet is 10 to 18 passes, wherein the rolling pass adopted in the first four passes of hot rolling is elliptical hole-circular hole-elliptical hole-circular hole, and the deformation amount of each hot rolling in the first four passes is 3 to 20 percent.
Further, in the first step, the cleaning treatment method of the inner surface of the stainless steel corrosion-resistant outer layer comprises the following steps: removing oxide skin and oil stain on the inner surface by an acid washing method; the cleaning treatment method of the outer surface of the HRB600 carbon steel core comprises the following steps: and removing scale and impurities on the outer surface by a shot blasting method or a mechanical processing method.
Further, in the first step, a gap of 0.5mm-4.0mm is formed between the stainless steel corrosion-resistant outer layer and the HRB600 carbon steel core, which are assembled into the stainless steel-carbon steel composite billet.
Further, in the third step, the stainless steel-carbon steel composite billet can be heated in a weak oxidizing atmosphere or under the protection of inert gas, and if the weak oxidizing atmosphere is adopted, the oxygen volume content of the weak oxidizing atmosphere is equal to or less than 3%; if the inert gas is adopted for protecting the hot rolling, the inert gas is helium or argon.
The corrosion-resistant HRB600E composite anti-seismic steel bar and the manufacturing method of the corrosion-resistant HRB600E composite anti-seismic steel bar have the beneficial effects that:
by adopting the combined structure of the outer layer corrosion-resistant stainless steel and the inner layer carbon steel core, each layer can exert the specific performance, namely, the corrosion-resistant HRB600E composite steel bar has good corrosion resistance and high toughness through the outer layer corrosion-resistant stainless steel pipe, and is suitable for various complex application scenes, such as engineering of construction under seawater and engineering in alpine regions; the composite anti-seismic steel bar has high strength and good toughness through the internal carbon steel core, the bending resistance is greatly improved, and the strength is greatly improved; meanwhile, the metallurgical bonding between the inner layer and the outer layer ensures that the contact part of the inner layer and the outer layer is mutually permeated and fused to form an intermediate transition layer, so that the composite anti-seismic reinforcing steel bar obtains good elongation after fracture, the overall performance of the composite reinforcing steel bar is greatly improved, and the standard requirement of the anti-seismic reinforcing steel bar is met.
By adopting the creative manufacturing method, firstly, the assembled stainless steel-carbon steel composite billet is placed into vacuum packaging equipment and vacuumized, and then the two ends of the stainless steel-carbon steel composite billet are welded and sealed, namely the outer layer and the inner core are in a vacuum state, and no oxygen is arranged in the space and the gap between the outer layer and the inner core, so that the surfaces of the inner layer and the outer layer cannot be oxidized in the heating and hot rolling processes of the stainless steel-carbon steel composite billet, the metallurgical bonding between the inner layer and the outer layer is better, and the overall performance after hot rolling is better. Secondly, the stainless steel-carbon steel composite billet with two sealed ends is heated in a weak oxidizing atmosphere or under the protection of inert gas, so that the outer layer of the stainless steel-carbon steel composite billet is prevented from being oxidized in the heating process, namely the outer layer of the stainless steel pipe is oxidized, and the corrosion resistance of the outer layer of the stainless steel is protected. Thirdly, the beginning rolling temperature and the end rolling temperature of the hot rolling are controlled, namely the whole process of the hot rolling is controlled within a certain temperature range, so that the shape change of the stainless steel-carbon steel composite billet during the hot rolling can reach the preset requirement and the metallurgical bonding property between the outer layer and the inner layer is better.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic cross-sectional view of a first form of the corrosion-resistant HRB600E composite rebar of the present invention;
FIG. 2 is a schematic cross-sectional view of a second form of the corrosion-resistant HRB600E composite rebar of the present invention;
FIG. 3 is a schematic cross-sectional view of a third form of the corrosion-resistant HRB600E composite rebar of the present invention;
fig. 4 is a schematic view of a corrosion-resistant HRB600E composite steel bar product according to the present invention.
The figures are labeled as follows:
1-a stainless steel corrosion resistant outer layer; 2-HRB600 carbon steel core; 3-metallurgical bonding transition layer; 11-inclined rib structure; 12-inverted rib structure.
Detailed Description
In order to make the technical solutions in the embodiments of the present invention better understood and make the above objects, features and advantages of the present invention more comprehensible, specific embodiments of the present invention are described below with reference to the accompanying drawings.
Here, the description of the embodiments is provided to help understanding of the present invention, but the present invention is not limited thereto. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
Example one
Referring to fig. 1 to 4, a corrosion-resistant HRB600E composite anti-seismic steel bar of the present embodiment includes: the stainless steel corrosion-resistant outer layer 1 and the HRB600 carbon steel core 2 are assembled, and then the stainless steel corrosion-resistant outer layer 1 is coated on the periphery of the HRB600 carbon steel core 2, and the stainless steel corrosion-resistant outer layer 1 and the HRB600 carbon steel core 2 are hot-rolled to form a metallurgical bonding transition layer 3; the thickness of the stainless steel corrosion-resistant outer layer 1 is 0.10mm-1.50mm, the thickness of the stainless steel corrosion-resistant outer layer 1 is 0.6% -10% of the radius of the composite steel bar, and the thickness of the metallurgical bonding transition layer 3 is 0.02mm-0.15 mm.
Preferably, the stainless steel corrosion-resistant outer layer 1 is made of a stainless steel pipe, and 2205, 304, 316 or 316L is selected as the stainless steel material of the stainless steel corrosion-resistant outer layer 1; the HRB600 carbon steel core 2 is made of carbon steel or low alloy steel, and the HRB600 carbon steel core 2 comprises 0.10-0.30 wt% of C, 0.20-0.80 wt% of Si, 1.00-2.25 wt% of Mn and 0.05-0.15 wt% of V.
Further preferably, the outer surface of the stainless steel corrosion-resistant outer layer 1 is provided with an inclined rib structure 11, and the inclined rib structure 11 is welded or riveted on the outer surface of the stainless steel corrosion-resistant outer layer 1; alternatively, the inclined rib structure 11 and the stainless steel corrosion-resistant outer layer 1 are integrally formed.
Further preferably, the inner surface of the stainless steel corrosion-resistant outer layer 1 is provided with an inverted rib structure 12 extending inwards, the inverted rib structure 12 is formed by hot rolling so that the inner surface of the stainless steel corrosion-resistant outer layer 1 extends inwards, and the height of the inward extending inverted rib structure 12 is 0.01mm-0.03 mm.
Example two
Referring to fig. 1 to 4, a method for manufacturing a corrosion-resistant HRB600E composite anti-seismic steel bar of the present embodiment includes the following steps:
firstly, manufacturing a stainless steel corrosion-resistant outer layer 1 and an HRB600 carbon steel core 2 according to a preset size, and performing impurity removal and decontamination cleaning treatment on the inner surface of the stainless steel corrosion-resistant outer layer 1 and the outer surface of the HRB600 carbon steel core 2; and then assembling the stainless steel corrosion-resistant outer layer 1 and the HRB600 carbon steel core 2 to obtain the stainless steel-carbon steel composite billet.
And step two, putting the assembled stainless steel-carbon steel composite billet into vacuum packaging equipment, vacuumizing the vacuum packaging equipment, removing air between the stainless steel corrosion-resistant outer layer 1 and the HRB600 carbon steel core 2 to ensure that the vacuum degree is less than or equal to 0.001MPa, and welding and sealing two ends of the stainless steel-carbon steel composite billet in the vacuum packaging equipment.
And step three, heating the welded and sealed stainless steel-carbon steel composite billet in a billet heating furnace to 1050-1150 ℃ for 1-3 hours to ensure that the internal and external temperatures of the stainless steel-carbon steel composite billet are uniform.
And step four, discharging the heated stainless steel-carbon steel composite billet out of the furnace for hot rolling, controlling the initial rolling temperature to be more than 950 ℃, controlling the final rolling temperature to be not less than 750 ℃, and obtaining the corrosion-resistant HRB600E composite anti-seismic steel bar through a multi-pass hot rolling process according to the designed size and shape.
As a preferred embodiment, after the fourth step, the prepared corrosion-resistant HRB600E composite aseismic steel bar further comprises a cooling step: and (3) carrying out water-through cooling on the corrosion-resistant HRB600E composite steel bar water inlet tank after the corrosion-resistant HRB600E composite steel bar water outlet from the hot rolling mill, and controlling the temperature of the corrosion-resistant HRB600E composite steel bar after the water-through cooling to be 550-950 ℃.
Further preferably, in the fourth step, the hot rolling pass of the stainless steel-carbon steel composite billet is 10 to 18 passes, wherein the rolling pass adopted in the first four passes of the hot rolling is elliptical hole-circular hole-elliptical hole-circular hole, and the deformation amount of each hot rolling in the first four passes is 3 to 20 percent.
Preferably, in the step one, the cleaning treatment method of the inner surface of the stainless steel corrosion-resistant outer layer 1 comprises the following steps: removing oxide skin and oil stain on the inner surface by an acid washing method; the cleaning treatment method of the outer surface of the HRB600 carbon steel core 2 comprises the following steps: and removing scale and impurities on the outer surface by a shot blasting method or a mechanical processing method.
Preferably, in the first step, a gap of 0.5mm-4.0mm is formed between the stainless steel corrosion-resistant outer layer 1 and the HRB600 carbon steel core 2 which are assembled into the stainless steel-carbon steel composite billet.
Preferably, in the third step, the stainless steel-carbon steel composite billet can be heated in a weakly oxidizing atmosphere or under the protection of inert gas, and if the weakly oxidizing atmosphere is adopted, the oxygen volume content of the weakly oxidizing atmosphere is equal to or less than 3%; if the inert gas is adopted for protecting the hot rolling, the inert gas is helium or argon.
The corrosion-resistant HRB600E composite anti-seismic steel bar prepared by the manufacturing method is subjected to mechanical property detection by taking a 450mm long sample, and the steel bar has the following properties:
| serial number | Specification of | Yield strength/MPa | Tensile strength/MPa | A/％ | Agt/％ | Ratio of yield to |
| 1 | Φ25 | 635 | 836 | 24.2 | 13.7 | 1.32 |
| 2 | Φ25 | 638 | 842 | 22.6 | 12.8 | 1.32 |
| 3 | Φ25 | 633 | 838 | 22.8 | 13.3 | 1.35 |
The embodiments in the present specification are described in a progressive manner, and portions that are similar to each other in the embodiments are referred to each other, and each embodiment focuses on differences from other embodiments.
The embodiments of the present invention are described in detail with reference to the drawings, but the present invention is not limited to the described embodiments. It will be appreciated by those skilled in the art that various changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, which is also within the scope of the invention.
Claims (9)
1. A corrosion-resistant HRB600E composite anti-seismic steel bar, comprising: the stainless steel anti-corrosion composite material comprises a stainless steel anti-corrosion outer layer (1) and an HRB600 carbon steel core (2), wherein the stainless steel anti-corrosion outer layer (1) is coated on the periphery of the HRB600 carbon steel core (2), and the stainless steel anti-corrosion outer layer (1) and the HRB600 carbon steel core (2) are assembled and then are hot-rolled to form a metallurgical bonding transition layer (3);
the thickness of the stainless steel corrosion-resistant outer layer (1) is 0.10mm-1.50mm, the thickness of the stainless steel corrosion-resistant outer layer (1) is 0.6% -10% of the radius of the composite steel bar, and the thickness of the metallurgical bonding transition layer (3) is 0.02mm-0.15 mm.
2. The composite anti-seismic steel bar according to claim 1, wherein the stainless steel corrosion-resistant outer layer (1) is made of stainless steel pipes, and 2205, 304, 316 or 316L is selected as the stainless steel material for the stainless steel corrosion-resistant outer layer (1); the HRB600 carbon steel core (2) is made of carbon steel or low alloy steel, and the components of the HRB600 carbon steel core (2) comprise 0.10-0.30 wt% of C, 0.20-0.80 wt% of Si, 1.00-2.25 wt% of Mn and 0.05-0.15 wt% of V.
3. A composite anti-seismic steel bar according to claim 1 or 2, wherein an inverted rib structure (12) is protruded inwards from the inner surface of the stainless steel corrosion-resistant outer layer (1), the inverted rib structure (12) is formed by hot rolling so that the inner surface of the stainless steel corrosion-resistant outer layer (1) extends inwards, and the inward protruded height of the inverted rib structure (12) is 0.01mm-0.03 mm.
4. A manufacturing method of corrosion-resistant HRB600E composite anti-seismic steel bars is characterized by comprising the following steps:
firstly, a stainless steel corrosion-resistant outer layer (1) and an HRB600 carbon steel core (2) are manufactured according to a preset size, and the inner surface of the stainless steel corrosion-resistant outer layer (1) and the outer surface of the HRB600 carbon steel core (2) are subjected to cleaning treatment for removing impurities and dirt; then assembling the stainless steel corrosion-resistant outer layer (1) and the HRB600 carbon steel core (2) to obtain a stainless steel-carbon steel composite billet;
step two, the assembled stainless steel-carbon steel composite billet is placed into vacuum packaging equipment, then the vacuum packaging equipment is vacuumized, air between the stainless steel corrosion-resistant outer layer (1) and the HRB600 carbon steel core (2) is removed, the vacuum degree is smaller than or equal to 0.001MPa, and the tail end of the stainless steel-carbon steel composite billet is welded and sealed in the vacuum packaging equipment;
step three, heating the welded and sealed stainless steel-carbon steel composite billet in a billet heating furnace to 1050-1150 ℃ for 1-3 hours to ensure that the internal and external temperatures of the stainless steel-carbon steel composite billet are uniform;
and step four, discharging the heated stainless steel-carbon steel composite billet out of the furnace, performing hot rolling, controlling the initial rolling temperature to be more than 950 ℃, controlling the final rolling temperature to be not less than 750 ℃, and obtaining the corrosion-resistant HRB600E composite anti-seismic steel bar through a multi-pass hot rolling process according to the designed size and shape.
5. The manufacturing method according to claim 4, wherein after the fourth step, the manufactured corrosion-resistant HRB600E composite steel bar further comprises a cooling step of: and (3) cooling the corrosion-resistant HRB600E composite steel bar water inlet tank after the corrosion-resistant HRB600E composite steel bar water outlet from the hot rolling mill with water penetration, and controlling the temperature of the corrosion-resistant HRB600E composite steel bar after the water penetration cooling to be 550-950 ℃.
6. The manufacturing method according to claim 4, wherein in the fourth step, the hot rolling passes of the stainless steel-carbon steel composite billet are 10 to 18 passes, wherein the rolling pass adopted in the first four passes of the hot rolling is elliptical hole-circular hole-elliptical hole-circular hole, and the deformation amount of each of the first four hot rolling is 3 to 20 percent.
7. The manufacturing method according to claim 4, wherein in the first step, the cleaning treatment method for the inner surface of the stainless steel corrosion-resistant outer layer (1) comprises the following steps: removing oxide skin and oil stain on the inner surface by an acid washing method; the cleaning treatment method of the outer surface of the HRB600 carbon steel core (2) comprises the following steps: and removing scale and impurities on the outer surface by a shot blasting method or a mechanical processing method.
8. The manufacturing method according to claim 4, characterized in that in step one, a gap of 0.5mm-4.0mm is provided between the stainless steel corrosion-resistant outer layer (1) and the HRB600 carbon steel core (2) assembled into the stainless steel-carbon steel composite billet.
9. The method according to claim 4, wherein in the third step, the stainless steel-carbon steel composite billet is heated in a billet heating furnace under a weakly oxidizing atmosphere or under protection of inert gas; if the weak oxidizing atmosphere is adopted, the oxygen volume content of the weak oxidizing atmosphere is equal to or less than 3 percent; if the inert gas is adopted for protecting the hot rolling, the inert gas is helium or argon.
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