CN213710102U - High-strength high-toughness corrosion-resistant multilayer composite steel bar - Google Patents
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Abstract
The utility model discloses a corrosion-resistant multilayer composite reinforcement of high strength and high toughness, include: the composite material comprises an outer layer (1), an intermediate layer (2) and an inner core part (3), wherein the outer layer (1), the intermediate layer (2) and the inner core part (3) are sequentially sleeved from outside to inside, and metallurgical bonding is formed between the outer layer (1) and the intermediate layer (2) and between the intermediate layer (2) and the inner core part (3); the ratio of the thickness of the outer layer (1), the thickness of the intermediate layer (2) and the radius of the inner core (3) is 1: (1-5): (5-30); the lengths of the outer layer (1), the intermediate layer (2) and the inner core (3) in the axial direction are 20cm-200 m. By adopting the three-layer structure of the outer layer, the middle layer and the inner core part, each layer can exert the specific performance thereof, and the performances of high strength, high toughness and corrosion resistance are achieved.
Description
Technical Field
The utility model relates to a metal material and metallurgical steel rolling technical field, in particular to high strength and high toughness corrosion-resistant multilayer composite steel bar to and a manufacturing method of high strength and high toughness corrosion-resistant multilayer composite steel bar.
Background
The steel bar is an important raw material of reinforced concrete, and is widely applied to the field of building construction in various industries, the traditional steel bar is produced by adopting a carbon steel material, but the carbon steel has the defects of easy oxidation and easy corrosion, particularly in coastal and river-following water edge and underwater concrete, the corrosion of chloride to the steel bar in the concrete is aggravated along with the time, and the corrosion of the steel bar is one of the main reasons for the durability failure of a reinforced concrete structure, so that the service life and the safety of a building are seriously influenced.
With the development of marine economy in China and the construction requirements of remote islands, the demand for construction of reinforced concrete projects on offshore islands increases. The development of China on oceans enters the golden period, but the severe ocean environment leads the concrete structure with strong durability to be generally recognized to be damaged prematurely due to insufficient durability, and the development of China's ocean economy is severely restricted. In the marine environment, chloride ion corrosion is the most prominent factor causing corrosion of steel bars. Chloride ions in the seawater sand chemically react with the steel bars to cause corrosion and expansion of the steel bars along the steel bars, so that concrete cracks appear, the durability of the concrete structure is reduced, and the design service life of the concrete structure is prolonged.
In order to improve the corrosion resistance of the coastal area building engineering and sea island marine defense engineering, measures are taken to prevent the carbon steel bars from being corroded by chloride ions permeating concrete and contacting the steel bars in the environment of seawater and the environment needing frequent use of snow melting salt, such as stainless steel bars. Stainless steel bars have excellent corrosion resistance, but their yield strength is relatively low. The common carbon steel twisted steel has high strength, but the toughness indexes such as elongation and the like are reduced along with the improvement of the indexes such as national performance and the like such as strength and the like, and the safety of buildings is influenced.
The layered metal composite material can utilize the unique properties of each component to make up for the defects of a single metal material or the defects caused by insufficient overall properties or the limitation of natural conditions, such as high strength, high toughness, fatigue property, impact property, corrosion and even deformation property. The layered metal composite material consisting of the materials with corrosion resistance, high toughness and high strength has good corrosion resistance, strength and toughness and can not be obtained by other traditional materials, so that the multilayer layered composite steel bar is more and more highly valued by people.
SUMMERY OF THE UTILITY MODEL
The technical problem to be solved by the utility model is to provide a high-strength high-toughness corrosion-resistant multilayer composite steel bar and a manufacturing method thereof, the multilayer composite steel bar simultaneously has excellent corrosion resistance of stainless steel, high toughness of low-carbon steel and high strength of carbon steel or low-alloy steel; the manufacturing method of the multilayer composite steel bar adopts the hot rolling under the vacuum environment or the hot rolling after vacuumizing the composite layers, so that the layers of the multilayer composite steel bar are not oxidized completely in the hot rolling process, and the metallurgical bonding between the layers is tighter. In order to solve the problem, the utility model provides a pair of corrosion-resistant multilayer composite steel bar of high strength and toughness, its technical scheme as follows:
the utility model discloses a corrosion-resistant multilayer composite reinforcement of high strength and toughness, multilayer composite reinforcement includes: the composite material comprises an outer layer, a middle layer and an inner core part, wherein the outer layer, the middle layer and the inner core part are sequentially sleeved from outside to inside, and metallurgical bonding is formed between the outer layer and the middle layer and between the middle layer and the inner core part; the ratio of the outer layer thickness, the intermediate layer thickness and the inner core radius is 1: (1-5): (5-30); the lengths of the outer layer, the intermediate layer and the inner core part in the axial direction are 20cm-200 m. The outer layer is an anti-corrosion functional layer and is made of a seamless stainless steel pipe; the middle layer is a toughness functional layer and is made of low-carbon steel pipes; the inner core part is a strength functional layer and is made of carbon steel or low alloy steel.
Compared with the composite steel bar in the prior art, the high-strength high-toughness corrosion-resistant multilayer composite steel bar of the utility model adopts the three-layer structure of the outer layer, the middle layer and the inner core part, so that each layer can play the specific performance, namely, the multilayer composite steel bar has good corrosion resistance through the outer seamless stainless steel pipe; the multi-layer composite steel bar has good toughness performance and greatly improved bending resistance through the low-carbon steel pipe in the middle layer; the multilayer composite steel bar has good strength performance through the carbon steel or the low alloy steel of the inner core part; and then the three parts are metallurgically combined, so that the contact parts of the three parts are mutually permeated and fused, and the integrity of the multilayer composite reinforcing steel bar is greatly improved. The composite steel bar in the prior art is generally compounded by adopting a double-layer structure, such as the applicant's prior patent application 201510695276.0, and adopts a double-layer composite structure combining a stainless steel outer layer and a carbon steel core, so that the composite steel bar has certain corrosion resistance and strength mechanical property, but does not have the high strength, high toughness and corrosion resistance of the composite steel bar.
As an improvement of the high-strength high-toughness corrosion-resistant multilayer composite steel bar of the utility model, the thickness of the outer layer is 0.2mm-2mm, and the weight of the outer layer accounts for 5% -25% of the total weight of the multilayer composite steel bar; the thickness of the middle layer is 0.2mm-10mm, and the weight of the middle layer accounts for 15% -35% of the total weight of the multilayer composite steel bar. The thickness and the weight ratio of the outer layer and the middle layer are further limited, and the thickness and the weight ratio are proved to be limited through a plurality of experimental demonstrations and a plurality of field practice verifications, so that the corrosion resistance and the toughness of the composite steel bar are improved to the maximum extent on the premise of not reducing the strength of the composite steel bar, and the optimal combination of the three properties is achieved.
Further, the outer surface of the outer layer is provided with an inclined rib structure, and the inclined rib structure is welded or riveted on the outer surface of the outer layer; or the inclined rib structure and the outer layer are of an integrally formed structure.
The utility model discloses a manufacturing method of corrosion-resistant multilayer composite steel bar of high strength and toughness, manufacturing method includes following step:
assembling an outer layer, a middle layer and an inner core part which are manufactured according to a preset size, sleeving the middle layer on the inner core part, and sleeving the outer layer on the middle layer to form a composite blank of the outer layer, the middle layer and the inner core part; placing the composite blank into a vacuum chamber, vacuumizing, and sealing two ends of the composite blank by welding in a vacuum environment to form a closed vacuum environment between the outer layer and the middle layer and between the middle layer and the inner core part; or, welding and sealing one end of the composite blank, vacuumizing the space between the outer layer and the middle layer and the space between the middle layer and the inner core part, and then welding and sealing. Wherein a degree of vacuum between the outer layer and the intermediate layer and between the intermediate layer and the inner core portion is equal to or less than 0.001 Pa.
And step two, heating the welded and sealed composite blank to 1050-1200 ℃ in a weak oxidizing atmosphere or under the protection of inert gas for 1-4 hours, and ensuring the uniform internal and external temperatures. Wherein, if the weak oxidizing atmosphere is adopted, the oxygen volume content of the weak oxidizing atmosphere is equal to or less than 5 percent.
And step three, carrying out hot rolling on the heated composite blank, controlling the initial rolling temperature to be above 920 ℃, controlling the final rolling temperature to be not lower than 750 ℃, and obtaining the high-strength high-toughness corrosion-resistant multilayer composite steel bar with smooth surfaces or ribs through a hot rolling process according to the designed size and shape.
The utility model discloses a manufacturing method of corrosion-resistant multilayer composite reinforcement of high strength and high toughness, compare with the manufacturing method of composite reinforcement among the prior art, first is to place the composite blank after the equipment and take out the both ends welded seal with composite blank in the vacuum chamber after the vacuum, even get outer, be vacuum state between intermediate level and the inside core, interval between the three, there is not oxygen in the gap, thereby make this composite blank in heating and hot rolling in-process, the surface on these ectonexine can not be by the oxidation, make metallurgical bonding between the three better, the wholeness can be better after the hot rolling. Secondly, the composite blank with two sealed ends is heated in weak oxidizing atmosphere or under the protection of inert gas, so that the outer layer of the composite blank 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. And thirdly, by controlling the initial rolling temperature and the final rolling temperature of the hot rolling, namely controlling the whole process of the hot rolling within a certain temperature range, the shape change of the composite blank during the hot rolling can reach the preset requirement and the metallurgical bonding property between layers is better.
Further, in the first step, the outer layer, the intermediate layer, and the inner core portion are cleaned and decontaminated before being assembled, and the outer layer and the intermediate layer have scale on the inner and outer surfaces thereof removed by shot blasting, pickling, or machining, and the inner core portion has scale on the outer surface thereof removed by shot blasting, pickling, or machining. Therefore, the impurities and the oxide skin on the surfaces of the three parts are removed, the combinability of the three parts during hot rolling can be improved, and the integrity and the overall quality of the multilayer composite steel bar are improved.
Further, in the first step, gaps of 0.1mm-2mm are formed between the outer layer and the middle layer and between the middle layer and the inner core part. Therefore, a proper extruding and extending space is formed among the three components during hot rolling, and the condition that the outer layer or the middle layer bulges outwards due to the thermal expansion factor in the heating process is avoided.
Further, the inner core part is a round steel rod or a square steel rod made of Q690, 42CrMo, 35CrMo or 50CrVA, and if the inner core part is the round steel rod, the diameter of the inner core part is 100mm-200 mm; if the inner core part is a square steel bar, the side length of the inner core part is 100mm-200 mm.
The utility model provides a manufacturing approach's of high strength and high toughness corrosion-resistant multilayer composite reinforcement and this high strength and high toughness corrosion-resistant multilayer composite reinforcement beneficial effect is:
by adopting the three-layer structure of the outer layer, the middle layer and the inner core part, each layer can play the specific performance, namely, the seamless stainless steel pipe of the outer layer enables the multilayer composite steel bar to have good corrosion resistance; the multi-layer composite steel bar has good toughness performance and greatly improved bending resistance through the low-carbon steel pipe in the middle layer; the multilayer composite steel bar has good strength performance through the carbon steel or the low alloy steel of the inner core part; and then the three parts are metallurgically combined, so that the contact parts of the three parts are mutually permeated and fused, and the integrity of the multilayer composite reinforcing steel bar is greatly improved.
Through adopting the creative manufacturing method, firstly, the assembled composite blank is placed in a vacuum chamber and vacuumized, and then the two ends of the composite blank are welded and sealed, namely, the outer layer, the middle layer and the inner core are in a vacuum state, and no oxygen is arranged in the space and the gap among the outer layer, the middle layer and the inner core, so that the surfaces of the inner layer and the outer layer can not be oxidized in the heating and hot rolling processes of the composite blank, the metallurgical bonding among the three layers is better, and the overall performance after hot rolling is better. Secondly, the composite blank with two sealed ends is heated in weak oxidizing atmosphere or under the protection of inert gas, so that the outer layer of the composite blank 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. And thirdly, by controlling the initial rolling temperature and the final rolling temperature of the hot rolling, namely controlling the whole process of the hot rolling within a certain temperature range, the shape change of the composite blank during the hot rolling can reach the preset requirement and the metallurgical bonding property between layers is better.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly described 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 to obtain other drawings without creative efforts.
FIG. 1 is a schematic cross-sectional structure view of a first form of the high strength, high toughness and corrosion resistant multi-layer composite steel bar of the present invention;
FIG. 2 is a schematic cross-sectional structure view of a second form of the high strength, high toughness and corrosion resistant multi-layer composite steel bar of the present invention;
FIG. 3 is a schematic view of the longitudinal section structure of the high-strength high-toughness corrosion-resistant multi-layer composite steel bar of the present invention;
fig. 4 is a schematic cross-sectional structure diagram of the composite blank of the high-strength high-toughness corrosion-resistant multilayer composite steel bar during assembly;
fig. 5 is the utility model discloses the corrosion-resistant multilayer composite reinforcement that excels in high tenacity takes the diagonal rib composite reinforcement, multilayer composite twisted steel's product schematic promptly.
The figures are labeled as follows:
1-an outer layer; 2-an intermediate layer; 3-an inner core portion; 101-inclined rib structure.
Detailed Description
In order to make the technical solution in the embodiments of the present invention better understood and make the above objects, features and advantages of the present invention more obvious and understandable, the following description of the embodiments of the present invention is provided with reference to the accompanying drawings.
It should be noted that 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 related to 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 5, the high-strength, high-toughness and corrosion-resistant multi-layer composite steel bar of the present embodiment includes: the steel wire core comprises an outer layer 1, an intermediate layer 2 and an inner core part 3, wherein the outer layer 1, the intermediate layer 2 and the inner core part 3 are sequentially sleeved from outside to inside, and metallurgical bonding is formed between the outer layer 1 and the intermediate layer 2 and between the intermediate layer 2 and the inner core part 3; the ratio of the thickness of the outer layer 1, the thickness of the intermediate layer 2 and the radius of the inner core part 3 is 1: (1-5): (5-30); the outer layer 1, the intermediate layer 2 and the inner core 3 have a length of 20cm to 200m in the axial direction.
Wherein, the outer layer 1 is an anti-corrosion functional layer and is made of seamless stainless steel pipes; the middle layer 2 is a toughness functional layer and is made of low-carbon steel pipes; the inner core 3 is a functional layer of strength and is made of carbon steel or low alloy steel.
Preferably, the thickness of the outer layer 1 is 0.2mm-2mm, and the weight of the outer layer 1 accounts for 5% -25% of the total weight of the multilayer composite steel bar; the thickness of the middle layer 2 is 0.2mm-10mm, and the weight of the middle layer 2 accounts for 15% -35% of the total weight of the multilayer composite steel bar. More preferably, the thickness of the outer layer 1 is 0.2mm-1mm, and the weight of the outer layer 1 accounts for 10% -20% of the total weight of the multilayer composite steel bar; the thickness of the middle layer 2 is 0.5mm-5mm, and the weight of the middle layer 2 accounts for 20% -30% of the total weight of the multilayer composite steel bar.
As a preferable example of the present embodiment, the outer surface of the outer layer 1 is provided with an inclined rib structure 101, and the inclined rib structure 101 is welded or riveted on the outer surface of the outer layer 1; alternatively, the diagonal rib structure 101 and the outer layer 1 are integrally formed.
Example two
Referring to fig. 1 to 5, the high-strength, high-toughness and corrosion-resistant multi-layer composite steel bar of the present embodiment includes: outer 1, intermediate level 2 and inner core portion 3, outer 1, intermediate level 2 and inner core portion 3 suit in proper order from outer to interior sets up, is metallurgical bonding between outer 1 and intermediate level 2 and between intermediate level 2 and the inner core portion 3.
Wherein, the outer layer 1 adopts a 316L stainless steel seamless steel pipe, and the specific size is phi 159mm multiplied by 6mm multiplied by 9m (outer diameter multiplied by wall thickness multiplied by length); the intermediate layer 2 is made of low carbon steel seamless steel pipe, and the specific size is phi 146mm multiplied by 9m (outer diameter multiplied by wall thickness multiplied by length); the inner core portion 3 is a 42CrMo billet having specific dimensions of Φ 127mm × 9m (outer diameter × length). The width of the gap between the inner core 3 and the intermediate layer 2 and the width of the gap between the intermediate layer 2 and the outer layer 1 are both 0.5 mm. After the outer layer 1, the intermediate layer 2 and the inner core part 3 are assembled, as shown in fig. 3, the steel is heated and hot-rolled to finally be rolled into the multilayer composite deformed steel bar with the diameter of phi 25 mm.
EXAMPLE III
Referring to fig. 1 to 5, a method for manufacturing a high-strength, high-toughness, corrosion-resistant multi-layer composite steel bar according to the embodiment includes the following steps:
step one, assembling an outer layer 1, a middle layer 2 and an inner core part 3 which are manufactured according to a preset size, sleeving the middle layer 2 on the inner core part 3, and sleeving the outer layer 1 on the middle layer 2 to form a composite blank of the three; placing the composite blank into a vacuum chamber, vacuumizing, and sealing two ends of the composite blank by welding in a vacuum environment to form a closed vacuum environment between the outer layer 1 and the middle layer 2 and between the middle layer 2 and the inner core part 3; or, welding and sealing one end of the composite blank, vacuumizing the space between the outer layer 1 and the middle layer 2 and the space between the middle layer 2 and the inner core part 3, and then welding and sealing. Preferably, gaps of 0.1mm to 2mm are provided between the outer layer 1 and the intermediate layer 2 and between the intermediate layer 2 and the inner core portion 3. And the degree of vacuum between the outer layer 1 and the intermediate layer 2 and between the intermediate layer 2 and the inner core 3 is equal to or less than 0.001Pa, more preferably less than 0.0001 Pa.
And step two, heating the welded and sealed composite blank to 1050-1200 ℃ in a weak oxidizing atmosphere or under the protection of inert gas for 1-4 hours, and ensuring the uniform internal and external temperatures. Preferably, when a weakly oxidizing atmosphere is used, the oxygen volume content of the weakly oxidizing atmosphere is 5% or less.
And step three, carrying out hot rolling on the heated composite blank, controlling the initial rolling temperature to be above 920 ℃, controlling the final rolling temperature to be not lower than 750 ℃, and obtaining the high-strength high-toughness corrosion-resistant multilayer composite steel bar with smooth surfaces or ribs through a hot rolling process according to the designed size and shape.
As a preferable example of the present embodiment, in the first step, cleaning and impurity removing treatment is performed on each of the outer layer 1, the intermediate layer 2, and the inner core portion 3 before assembly, and scale on the inner and outer surfaces of the outer layer 1 and the intermediate layer 2 is removed by shot blasting, pickling, or machining, and scale on the outer surface of the inner core portion 3 is removed by shot blasting, pickling, or machining. Specifically, the impurity removing treatment is to remove oil stains, oxides, flash and burrs on the inner surface and the outer surface, then carry out acid cleaning treatment, and finally carry out cleaning treatment by using acetone.
Preferably, the inner core part 3 is a round steel rod or a square steel rod made of Q690, 42CrMo, 35CrMo or 50CrVA, and if the inner core part 3 is a round steel rod, the diameter is 100mm-200 mm; if the inner core part 3 is a square steel bar, the side length is 100mm-200 mm.
The mechanical properties and other indexes of the multi-layer composite deformed steel bar manufactured by the hot rolling according to the manufacturing method of the embodiment are shown in the following table, and the indexes of yield strength, corrosion resistance and the like are far beyond HRB400 and HRB 500.
The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the 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. Various changes, modifications, substitutions and alterations to these embodiments will occur to those skilled in the art without departing from the spirit and scope of the present invention.
Claims (4)
1. A high-strength high-toughness corrosion-resistant multilayer composite steel bar, which comprises: the composite material comprises an outer layer (1), an intermediate layer (2) and an inner core part (3), wherein the outer layer (1), the intermediate layer (2) and the inner core part (3) are sequentially sleeved from outside to inside, and metallurgical bonding is formed between the outer layer (1) and the intermediate layer (2) and between the intermediate layer (2) and the inner core part (3);
the ratio of the thickness of the outer layer (1), the thickness of the intermediate layer (2) and the radius of the inner core (3) is 1: (1-5): (5-30); the lengths of the outer layer (1), the intermediate layer (2) and the inner core (3) in the axial direction are 20cm-200 m.
2. The high-strength high-toughness corrosion-resistant multilayer composite steel bar according to claim 1, wherein the outer layer (1) is a corrosion-resistant functional layer and is made of a seamless stainless steel pipe; the middle layer (2) is a toughness functional layer and is made of a low-carbon steel pipe; the inner core part (3) is a strength functional layer and is made of carbon steel or low alloy steel.
3. The high-strength high-toughness corrosion-resistant multilayer composite steel bar according to claim 1 or 2, wherein the thickness of the outer layer (1) is 0.2mm-2mm, and the weight of the outer layer (1) accounts for 5% -25% of the total weight of the multilayer composite steel bar; the thickness of the middle layer (2) is 0.2mm-10mm, and the weight of the middle layer (2) accounts for 15% -35% of the total weight of the multilayer composite steel bar.
4. The high strength high toughness corrosion resistant multilayer composite steel bar according to claim 1 or 2, characterized in that the outer surface of the outer layer (1) is provided with an inclined rib structure (101), and the inclined rib structure (101) is welded or riveted on the outer surface of the outer layer (1); or the inclined rib structure (101) and the outer layer (1) are of an integrally molded structure.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113622597A (en) * | 2021-08-20 | 2021-11-09 | 湖南三泰新材料股份有限公司 | Stainless steel composite finish-rolled twisted steel and manufacturing method thereof |
| CN113877961A (en) * | 2021-10-22 | 2022-01-04 | 广东韶钢松山股份有限公司 | Stainless steel composite steel bar and preparation method thereof |
| CN117107148A (en) * | 2023-10-25 | 2023-11-24 | 常州市福莱姆车辆配件有限公司 | High-strength composite steel plate and stamping process thereof |
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2020
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113622597A (en) * | 2021-08-20 | 2021-11-09 | 湖南三泰新材料股份有限公司 | Stainless steel composite finish-rolled twisted steel and manufacturing method thereof |
| CN113877961A (en) * | 2021-10-22 | 2022-01-04 | 广东韶钢松山股份有限公司 | Stainless steel composite steel bar and preparation method thereof |
| CN113877961B (en) * | 2021-10-22 | 2023-10-20 | 广东韶钢松山股份有限公司 | Stainless steel composite reinforcing steel bar and preparation method thereof |
| CN117107148A (en) * | 2023-10-25 | 2023-11-24 | 常州市福莱姆车辆配件有限公司 | High-strength composite steel plate and stamping process thereof |
| CN117107148B (en) * | 2023-10-25 | 2024-02-27 | 常州市福莱姆车辆配件有限公司 | High-strength composite steel plate and stamping process thereof |
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Assignee: Yangjiang Santai Composite Materials Co.,Ltd. Assignor: HUNAN 3T NEW MATERIAL Co.,Ltd. Contract record no.: X2024980019509 Denomination of utility model: A high-strength, high toughness, corrosion-resistant multi-layer composite steel bar Granted publication date: 20210716 License type: Common License Record date: 20241022 Assignee: Hunan Layered Metal Composite Engineering Research Center Co.,Ltd. Assignor: HUNAN 3T NEW MATERIAL Co.,Ltd. Contract record no.: X2024980019503 Denomination of utility model: A high-strength, high toughness, corrosion-resistant multi-layer composite steel bar Granted publication date: 20210716 License type: Common License Record date: 20241022 |