CN112318964A - Stainless steel clad steel plate and manufacturing method thereof - Google Patents
Stainless steel clad steel plate and manufacturing method thereof Download PDFInfo
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- CN112318964A CN112318964A CN202011194520.2A CN202011194520A CN112318964A CN 112318964 A CN112318964 A CN 112318964A CN 202011194520 A CN202011194520 A CN 202011194520A CN 112318964 A CN112318964 A CN 112318964A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B15/00—Layered products comprising a layer of metal
- B32B15/01—Layered products comprising a layer of metal all layers being exclusively metallic
- B32B15/011—Layered products comprising a layer of metal all layers being exclusively metallic all layers being formed of iron alloys or steels
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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
- B21B1/38—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 sheets of limited length, e.g. folded sheets, superimposed sheets, pack rolling
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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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products having particular features of form
- B32B3/26—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer
- B32B3/30—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer characterised by a layer formed with recesses or projections, e.g. hollows, grooves, protuberances, ribs
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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
- B21B1/38—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 sheets of limited length, e.g. folded sheets, superimposed sheets, pack rolling
- B21B2001/383—Cladded or coated products
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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
- B21B1/38—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 sheets of limited length, e.g. folded sheets, superimposed sheets, pack rolling
- B21B2001/386—Plates
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/50—Properties of the layers or laminate having particular mechanical properties
- B32B2307/558—Impact strength, toughness
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Abstract
The invention discloses a stainless steel clad steel plate, comprising: the stainless steel plate comprises an outer stainless steel layer (1) and an inner steel core layer (2), wherein the outer stainless steel layer (1) wraps the periphery of the inner steel core layer (2), the outer stainless steel layer (1) and the inner steel core layer (2) are formed by hot rolling and combining, and metallurgical bonding is formed between the outer stainless steel layer (1) and the inner steel core layer (2); the outer stainless steel layer (1) comprises an upper stainless steel layer (101), a lower stainless steel layer (102) and a side stainless steel layer (103), and the ratio of the thickness of the upper stainless steel layer (101) to the thickness of the inner steel core layer (2) is 1: (1.5-50). The corrosion resistance of the stainless steel clad steel plate is greatly improved, and the stainless steel cladding is formed in the upper direction, the lower direction, the front direction and the rear direction of the stainless steel clad steel plate except the joint parts of the two ends of the stainless steel clad steel plate and other members, so that the inner steel core layer is strictly protected, and the inner steel core layer is not corroded due to contact with the outside or a third medium. The invention also discloses a manufacturing method of the stainless steel clad steel plate.
Description
Technical Field
The invention relates to the technical field of metal materials and metallurgical steel rolling, in particular to a stainless steel coated steel plate and a manufacturing method thereof.
Background
The steel bars and the steel plates are important raw materials of reinforced concrete and foundation construction buildings, and are widely applied to the field of building construction of various industries, the traditional steel bars and the steel plates are made of carbon steel, but the carbon steel has the defects of easy oxidation and easy corrosion, particularly in coastal, riverside and underwater concrete, the corrosion of chloride to the steel bars in the concrete is intensified along with the passage of time, and the corrosion of the steel bars is one of main reasons for the failure of the durability of the reinforced concrete structure, so that the service life and the safety of the building are seriously influenced.
At present, as an improved composite steel plate, stainless steel layers are compounded on the upper surface, the lower surface or the upper surface and the lower surface of plain carbon steel, and the composite structure does not seal the inner plain carbon steel on the side wall of the composite steel plate, so that the corrosion resistance is greatly reduced; on the other hand, the two-layer or three-layer or multi-layer composite structure has insufficient integrity between layers and even has the phenomenon of sliding layer because the periphery is not hermetically sealed or only welded and combined.
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 main factor causing the corrosion of the steel bars, common carbon steel is easy to rust and corrode in severe environments such as seawater or saline alkali, and stainless steel has good corrosion resistance, can be used in various environments, is not easy to corrode, and has attractive appearance.
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 or stainless steel plates. Stainless steel bars/plates have excellent corrosion resistance, but their yield strength is relatively low. The common carbon 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 composed 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/composite steel plate is more and more highly valued by people.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a stainless steel clad steel plate and a manufacturing method thereof, wherein the stainless steel clad steel plate simultaneously has excellent corrosion resistance of the stainless steel plate, high toughness of a low-carbon steel plate and high strength of carbon steel or low-alloy steel; on the other hand, the stainless steel clad steel plate adopts the inner steel core which is internally clad with the stainless steel from front to back up and down, so that the corrosion resistance and the overall performance are greatly improved. The manufacturing method of the stainless steel clad steel plate adopts the hot rolling under the vacuum environment or the hot rolling after vacuumizing the composite layers, so that the stainless steel clad steel plate layers can not be oxidized completely in the hot rolling process, and the metallurgical bonding between the layers is tighter. In order to solve the problems, the technical scheme of the high-strength high-toughness corrosion-resistant multilayer composite steel plate provided by the invention is as follows:
a stainless steel clad steel sheet of the present invention, the clad steel sheet comprising: the stainless steel core layer is formed by hot rolling through a stainless steel pipe, the inner steel core layer is formed by hot rolling through a steel core rod matched with the outer stainless steel layer, and the outer stainless steel layer is metallurgically bonded with the inner steel core layer. The outer stainless steel layer is a stainless steel round pipe, a stainless steel square pipe or a stainless steel flat pipe, and correspondingly, the inner steel core layer is a round steel core, a square steel core or a flat steel core; the diameter or the side length of a square hole of the stainless steel pipe for manufacturing the outer stainless steel layer is equal to or smaller than the outer diameter or the side length of a square steel core of the round steel core for manufacturing the inner steel core layer by 0.1-2.0 mm in size; namely, before hot rolling and forming, the assembled inner and outer layer blanks are combined in a surface contact mode or assembled at intervals with certain gaps.
The outer stainless steel layer comprises an upper stainless steel layer, a lower stainless steel layer and a side stainless steel layer, the thicknesses of the upper stainless steel layer, the lower stainless steel layer and the side stainless steel layer are equal, and the ratio of the thickness of the upper stainless steel layer to the thickness of the inner steel core layer is 1: (1.5-50). Wherein, the ratio of the thickness of the stainless steel upper layer to the thickness of the inner layer steel core layer is further 1: (2.5-30). And the weight of the outer stainless steel layer accounts for 3% -30% of the total weight of the whole stainless steel clad steel plate; further, the weight of the outer stainless steel layer accounts for 10% -20% of the total weight of the whole stainless steel clad steel plate.
Compared with the composite steel plate in the prior art, namely the composite steel plate with a stainless steel/carbon steel two-layer structure or a stainless steel/carbon steel/stainless steel three-layer structure in the prior art, the stainless steel clad steel plate has the advantages that the outer stainless steel layer is wrapped with the inner steel core layer on four sides, namely the stainless steel pipe is sleeved on the periphery of the carbon steel core and then is subjected to integral hot rolling forming to obtain the stainless steel clad steel plate, on one hand, the corrosion resistance of the stainless steel clad steel plate is greatly improved, the stainless steel cladding is respectively arranged in the upper direction, the lower direction, the front direction and the rear direction of the stainless steel clad steel plate except the joint position of the two ends of the stainless steel clad steel plate and other components, the inner steel core layer is strictly protected, and the inner steel core layer is; on the other hand, the integral outer stainless steel layer covers the inner steel core layer in four directions, namely the upper direction, the lower direction, the front direction and the rear direction, and metallurgical bonding is formed between the outer stainless steel layer and the inner steel core layer in the hot rolling forming process, so that the integrity and the consistency of the stainless steel coated steel plate are greatly improved, the phenomenon that the outer stainless steel layer slides or breaks away from the inner steel core layer is completely avoided, and the safety of the stainless steel coated steel plate in an application scene is greatly improved.
The ratio of the thickness of the stainless steel upper layer to the thickness of the inner steel core layer and the ratio of the weight of the outer stainless steel layer to the total weight of the whole stainless steel clad steel plate are limited, and multiple experimental demonstrations and multiple field practice verifications prove that the thickness and the weight ratio are limited, so that the corrosion resistance and the toughness of the stainless steel clad steel plate can be improved to the maximum extent on the premise of not reducing the strength of the stainless steel clad steel plate, and the optimal combination of the three properties is achieved.
As a further improvement of the invention, the wall surface of the stainless steel upper layer or/and the stainless steel lower layer, which is connected with the inner steel core layer, is provided with an outer layer protrusion or/and an outer layer pit, and the inner steel core layer is provided with a core layer pit and a core layer protrusion which are respectively matched with the outer layer protrusion and the outer layer pit; the height/depth of the outer layer protrusion and the outer layer pit protruding or recessed into the stainless steel upper layer or/and the stainless steel lower layer is 1/(3-20) of the thickness of the stainless steel upper layer.
Furthermore, criss-cross outer-layer convex ribs or/and outer-layer grooves are arranged on the wall surface of the stainless steel upper layer or/and the stainless steel lower layer, which is connected with the inner-layer steel core layer, and core-layer grooves and core-layer convex ribs which are respectively matched with the outer-layer convex ribs and the outer-layer grooves are arranged on the inner-layer steel core layer; the height/depth of the outer layer convex ribs and the outer layer grooves protruding or recessing into the stainless steel upper layer or/and the stainless steel lower layer is 1/(3-20) of the thickness of the stainless steel upper layer.
Like this, protruding through setting up outer protruding or/and outer pit and the sandwich layer that correspond are protruding, vertically and horizontally staggered's outer fin or/and outer recess and the sandwich layer fin that corresponds, make outer and inlayer steel core layer associativity of stainless steel, the adhesion is better, both combine together hot rolling fashioned stainless steel cladding steel sheet wholeness and further improve greatly, can avoid sliding in the staggered floor on length direction between the ectonexine completely in the use of this stainless steel cladding steel sheet, the life of stainless steel cladding steel sheet has been improved.
As a further improvement of the invention, the inner layer steel core layer is a carbon steel core or a low alloy steel core with the carbon content less than or equal to 0.25%, and the outer layer stainless steel layer is Cr-Ni series austenitic stainless steel, Cr-Mn-Ni series austenitic stainless steel, 304 stainless steel, 316 stainless steel or 316L stainless steel.
The invention relates to a manufacturing method of a stainless steel clad steel plate, which comprises the following steps:
respectively cleaning and impurity removing a stainless steel pipe for manufacturing an outer stainless steel layer and a steel core rod for manufacturing an inner steel core layer, removing oxide skins on the inner and outer surfaces of the stainless steel pipe by using a shot blasting, acid pickling or machining method, and removing the oxide skins on the outer surface of the steel core rod by using the shot blasting, acid pickling or machining method; sleeving a stainless steel pipe on a steel core rod to form a coated steel plate blank, wherein the stainless steel pipe is in surface contact fit or in gap fit with the steel core rod;
placing the coated steel plate blank into a vacuum chamber, vacuumizing, and sealing two ends of the coated steel plate blank by welding in a vacuum environment to form a closed vacuum environment between the stainless steel pipe and the steel core rod; or, welding and sealing one end of the clad steel plate blank, vacuumizing the space between the stainless steel pipe and the steel core rod, and then welding and sealing.
And step two, heating the welded and sealed coated steel plate blank to 1050-1250 ℃ for 1.5-5 hours to ensure that the internal and external temperatures of the coated steel plate blank are uniform. As a modification, the clad steel sheet blank may be heated in a weakly oxidizing atmosphere or under the protection of an inert gas.
And step three, carrying out hot rolling on the heated coated steel plate blank, controlling the initial rolling temperature to be more than 1020 ℃, controlling the final rolling temperature to be not less than 850 ℃, and obtaining the coated steel plate through one or more hot rolling processes according to the designed size.
Compared with the manufacturing method of the composite steel plate in the prior art, namely the press forming of the stainless steel layer/carbon steel layer and the stainless steel layer/carbon steel layer/stainless steel layer of the composite steel plate in the prior art, the manufacturing method of the stainless steel clad steel plate adopts the stainless steel pipe to be sleeved on the periphery of the steel core rod and then hot-rolled and formed into the stainless steel clad steel plate, so that the stainless steel cladding is formed in the four directions of the upper part, the lower part, the front part and the rear part of the stainless steel clad steel plate, the inner steel core layer in the stainless steel clad plate is strictly protected, and the inner steel core layer is prevented from being corroded due to the contact with the outside or a third.
Through being limited to vacuum state with the coating steel plate blank, even make the inside vacuum state that is of coating steel plate blank, interval between the two, the gap does not have oxygen to make this coating steel plate blank in heating and hot rolling process, the internal surface of stainless steel pipe and the surface of steel plug can not be oxidized, make metallurgical bonding between the two better, the wholeness can be better after the hot rolling. Secondly, the clad steel plate 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 clad steel plate 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, 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, so that the shape change of the coated steel plate blank during the hot rolling can reach the preset requirement and the metallurgical bonding property between layers is better.
As a further improvement of the invention, in the first step, the stainless steel pipe and the steel core rod are in surface contact fit with the interference magnitude of 0; or the stainless steel pipe and the steel core rod are matched with each other with a gap of 0.1mm-2.0 mm. And in the first step, the vacuum degree between the stainless steel pipe and the steel core rod is equal to or less than 0.1 Pa. In the second step, if a weakly oxidizing atmosphere is used, the oxygen volume content of the weakly oxidizing atmosphere is equal to or less than 5%.
The stainless steel clad steel plate and the manufacturing method thereof have the beneficial effects that:
by adopting the scheme that the stainless steel cladding steel plate is obtained by wrapping the stainless steel outer layer with the inner steel core layer on four sides, namely integrally hot-rolling and molding the stainless steel pipe sleeved on the periphery of the carbon steel core, on one hand, the corrosion resistance of the stainless steel cladding steel plate is greatly improved, and the stainless steel cladding steel plate is wrapped in stainless steel in the upper, lower, front and rear directions except the joint parts of the two ends of the stainless steel cladding steel plate and other components, so that the inner steel core layer is strictly protected, and the inner steel core layer is prevented from being corroded due to contact with the outside or a third medium; on the other hand, the integral outer stainless steel layer covers the inner steel core layer in four directions, namely the upper direction, the lower direction, the front direction and the rear direction, and metallurgical bonding is formed between the outer stainless steel layer and the inner steel core layer in the hot rolling forming process, so that the integrity and the consistency of the stainless steel coated steel plate are greatly improved, the phenomenon that the outer stainless steel layer slides or breaks away from the inner steel core layer is completely avoided, and the safety of the stainless steel coated steel plate in an application scene is greatly improved.
The ratio of the thickness of the stainless steel upper layer to the thickness of the inner steel core layer and the ratio of the weight of the outer stainless steel layer to the total weight of the whole stainless steel clad steel plate are limited, and multiple experimental demonstrations and multiple field practice verifications prove that the thickness and the weight ratio are limited, so that the corrosion resistance and the toughness of the stainless steel clad steel plate can be improved to the maximum extent on the premise of not reducing the strength of the stainless steel clad steel plate, and the optimal combination of the three properties is achieved.
Through being limited to vacuum state with the coating steel plate blank, even make the inside vacuum state that is of coating steel plate blank, interval between the two, the gap does not have oxygen to make this coating steel plate blank in heating and hot rolling process, the internal surface of stainless steel pipe and the surface of steel plug can not be oxidized, make metallurgical bonding between the two better, the wholeness can be better after the hot rolling. Secondly, the clad steel plate 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 clad steel plate 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, 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, so that the shape change of the coated steel plate 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 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 to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic cross-sectional view of a first form of a stainless steel coated steel sheet according to the present invention;
FIG. 2 is a schematic cross-sectional view of a second form of the stainless steel coated steel sheet of the present invention;
FIG. 3 is a schematic cross-sectional view of a third form of the stainless steel-clad steel sheet of the present invention;
FIG. 4 is a schematic diagram of a fourth form of the combined structure of the stainless steel clad steel plate of the present invention, in which the upper layer, the inner layer and the lower layer of stainless steel are staggered to show the inner structure clearly, and the stainless steel side wall layers at the front and rear positions are omitted;
FIG. 5 is a schematic diagram of a fifth embodiment of the composite structure of the stainless steel clad steel plate of the present invention, in which the upper layer, the inner core layer and the lower layer of stainless steel are staggered to show the inner structure, and the side wall layers of stainless steel at the front and rear positions are omitted;
FIG. 6 is a schematic cross-sectional structural view of a first form of clad steel sheet blank prior to manufacture of the stainless steel clad steel sheet of the present invention;
FIG. 7 is a schematic cross-sectional view of a second version of a clad steel sheet blank prior to manufacture of the stainless steel clad steel sheet of the present invention.
The figures are labeled as follows:
1-an outer stainless steel layer; 101-stainless steel upper layer; 102-stainless steel lower layer; 103-stainless steel side wall layers; 104-outer layer protrusion; 105-outer layer pits; 106-core layer pits; 107-core layer protrusion; 108-outer layer ribs; 109-outer layer grooves; 110-core grooves; 111-core layer ribs; 2-inner steel core layer.
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.
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 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 5, a stainless steel clad steel plate of the present embodiment includes: outer stainless steel layer 1 and inlayer steel sandwich layer 2, outer stainless steel layer 1 parcel is in the periphery of inlayer steel sandwich layer 2, and outer stainless steel layer 1 combines the shaping for combining through the hot rolling with inlayer steel sandwich layer 2, and outer stainless steel layer 1 adopts stainless steel pipe hot rolling shaping, and inlayer steel sandwich layer 2 adopts the steel core stick hot rolling shaping with outer stainless steel layer 1 looks adaptation, is metallurgical bonding between outer stainless steel layer 1 and the inlayer steel sandwich layer 2.
Outer stainless steel layer 1 includes stainless steel upper strata 101, stainless steel lower floor 102 and stainless steel side wall layer 103, and the thickness of stainless steel upper strata 101, stainless steel lower floor 102 and stainless steel side wall layer 103 equals, and the ratio of stainless steel upper strata 101 thickness to inner steel sandwich layer 2 thickness is 1: (1.5-50).
Preferably, the ratio of the thickness of the stainless steel upper layer 101 to the thickness of the inner steel core layer 2 is 1: (2.5-30), and the weight of the outer stainless steel layer 1 accounts for 3% -30% of the total weight of the whole stainless steel clad steel plate; more preferably, the ratio of the thickness of the stainless steel upper layer 101 to the thickness of the inner steel core layer 2 is 1: (5-20), and the weight of the outer stainless steel layer 1 accounts for 10-20% of the total weight of the whole stainless steel clad steel plate.
As a second and third preferred embodiments of the stainless steel clad steel sheet of the present embodiment, referring to fig. 2 and 3, the wall surface of the stainless steel upper layer 101 or/and the stainless steel lower layer 102, which is joined to the inner steel core layer 2, is provided with outer layer protrusions 104 or/and outer layer recesses 105, and the inner steel core layer 2 is provided with core layer recesses 106 and core layer protrusions 107, which are respectively fitted to the outer layer protrusions 104 and the outer layer recesses 105. The height/depth of the outer layer protrusions 104 and the outer layer recesses 105 protruding or recessed into the stainless steel upper layer 101 or/and the stainless steel lower layer 102 is 1/(3-20) of the thickness of the stainless steel upper layer 101.
As a fourth and fifth preferred embodiment of the stainless steel clad steel sheet of the present embodiment, the wall surface of the stainless steel upper layer 101 or/and the stainless steel lower layer 102, which is joined to the inner steel core layer 2, is provided with criss-cross outer layer ribs 108 or/and outer layer grooves 109, and the inner steel core layer 2 is provided with core layer grooves 110 and core layer ribs 111, which are respectively matched with the outer layer ribs 108 and the outer layer grooves 109. The height/depth of the outer layer ribs 108 and the outer layer grooves 109 protruding or recessed into the stainless steel upper layer 101 or/and the stainless steel lower layer 102 is 1/(3-20) of the thickness of the stainless steel upper layer 101.
More preferably, the inner steel core layer 2 is a carbon steel core or a low alloy steel core having a carbon content of 0.25% or less, and the outer stainless steel layer 1 is Cr-Ni austenitic stainless steel, Cr-Mn-Ni austenitic stainless steel, 304 stainless steel, 316 stainless steel, or 316L stainless steel.
Example two
Referring to fig. 1 to 7, a method for manufacturing a stainless steel clad steel plate according to the present embodiment includes the following steps:
respectively cleaning and impurity removing a stainless steel pipe for manufacturing an outer stainless steel layer 1 and a steel core rod for manufacturing an inner steel core layer 2, removing oxide skins on the inner and outer surfaces of the stainless steel pipe by using a shot blasting, acid pickling or machining method, and removing the oxide skins on the outer surface of the steel core rod by using the shot blasting, acid pickling or machining method; sleeving a stainless steel pipe on a steel core rod to form a coated steel plate blank, wherein the stainless steel pipe is in surface contact fit or in gap fit with the steel core rod;
placing the coated steel plate blank into a vacuum chamber, vacuumizing, and sealing two ends of the coated steel plate blank by welding in a vacuum environment to form a closed vacuum environment between the stainless steel pipe and the steel core rod; or, welding and sealing one end of the clad steel plate blank, vacuumizing the space between the stainless steel pipe and the steel core rod, and then welding and sealing.
And step two, heating the welded and sealed clad steel plate blank to 1050-1250 ℃ for 1.5-5 hours to ensure uniform internal and external temperature of the clad steel plate blank. Preferably, the welded and sealed clad steel plate blank is heated in a weakly oxidizing atmosphere or under an inert gas atmosphere.
And step three, carrying out hot rolling on the heated coated steel plate blank, controlling the initial rolling temperature to be more than 1020 ℃, controlling the final rolling temperature to be not less than 850 ℃, and obtaining the coated steel plate through one or more hot rolling processes according to the designed size.
Preferably, in the step one, the stainless steel pipe and the steel core rod are in surface contact fit with the interference magnitude of 0; or the stainless steel pipe and the steel core rod are matched with each other with a gap of 0.1mm-2.0 mm. In the first step, the vacuum degree between the stainless steel pipe and the steel core rod is equal to or less than 0.1 Pa. Preferably, a gap of 0.1mm-1.0mm is arranged between the stainless steel pipe and the steel core rod, and the vacuum degree between the stainless steel pipe and the steel core rod is equal to or less than 0.01 Pa.
Further preferably, in the second step, if a weakly oxidizing atmosphere is used, the oxygen volume content of the weakly oxidizing atmosphere is equal to or less than 5%.
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 above 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 (7)
1. A stainless steel clad steel sheet, comprising: the stainless steel plate comprises an outer stainless steel layer (1) and an inner steel core layer (2), wherein the outer stainless steel layer (1) wraps the periphery of the inner steel core layer (2), the outer stainless steel layer (1) and the inner steel core layer (2) are formed by hot rolling combination, the outer stainless steel layer (1) is formed by hot rolling of a stainless steel pipe, the inner steel core layer (2) is formed by hot rolling of a steel core rod matched with the outer stainless steel layer (1), and the outer stainless steel layer (1) and the inner steel core layer (2) are metallurgically combined;
outer stainless steel layer (1) includes stainless steel upper strata (101), stainless steel lower floor (102) and stainless steel lateral wall layer (103), stainless steel upper strata (101), stainless steel lower floor (102) and the thickness of stainless steel lateral wall layer (103) equals, stainless steel upper strata (101) thickness with the ratio of inlayer steel sandwich layer (2) thickness is 1: (1.5-50).
2. The stainless steel clad steel plate according to claim 1, wherein the wall surface of the stainless steel upper layer (101) or/and the stainless steel lower layer (102) which is bonded to the inner steel core layer (2) is provided with outer layer protrusions (104) or/and outer layer recesses (105), and the inner steel core layer (2) is provided with core layer recesses (106) and core layer protrusions (107) which are respectively matched with the outer layer protrusions (104) and the outer layer recesses (105);
the height/depth of the outer layer protrusion (104) and the outer layer pit (105) protruding or recessed into the stainless steel upper layer (101) or/and the stainless steel lower layer (102) is 1/(3-20) of the thickness of the stainless steel upper layer (101).
3. The stainless steel clad steel plate according to claim 1, wherein the wall surface of the stainless steel upper layer (101) or/and the stainless steel lower layer (102) which is connected with the inner steel core layer (2) is provided with criss-cross outer layer ribs (108) or/and outer layer grooves (109), and the inner steel core layer (2) is provided with core layer grooves (110) and core layer ribs (111) which are respectively matched with the outer layer ribs (108) and the outer layer grooves (109);
the height/depth of the outer layer convex ribs (108) and the outer layer grooves (109) protruding or recessing into the stainless steel upper layer (101) or/and the stainless steel lower layer (102) is 1/(3-20) of the thickness of the stainless steel upper layer (101).
4. The stainless steel clad steel sheet according to any one of claims 1 to 3, wherein the inner steel core layer (2) is a carbon steel core or a low alloy steel core having a carbon content of 0.25% or less, and the outer stainless steel layer (1) is Cr-Ni-based austenitic stainless steel, Cr-Mn-Ni-based austenitic stainless steel, 304 stainless steel, 316 stainless steel, or 316L stainless steel.
5. A method for manufacturing a stainless steel clad steel sheet, comprising the steps of:
respectively cleaning and impurity removing a stainless steel pipe for manufacturing an outer stainless steel layer (1) and a steel core rod for manufacturing an inner steel core layer (2), removing oxide skins on the inner and outer surfaces of the stainless steel pipe by using a shot blasting, acid pickling or machining method, and removing the oxide skins on the outer surface of the steel core rod by using the shot blasting, acid pickling or machining method; sleeving a stainless steel pipe on a steel core rod to form a coated steel plate blank, wherein the stainless steel pipe is in surface contact fit or in gap fit with the steel core rod;
placing the coated steel plate blank into a vacuum chamber, vacuumizing, and sealing two ends of the coated steel plate blank by welding in a vacuum environment to form a closed vacuum environment between the stainless steel seamless tube and the steel core rod; or, welding and sealing one end of the clad steel plate blank, vacuumizing the space between the stainless steel seamless tube and the steel core rod, and then welding and sealing;
step two, heating the welded and sealed coated steel plate blank to 1050-1250 ℃ for 1.5-5 hours to ensure that the internal and external temperatures of the coated steel plate blank are uniform;
and step three, carrying out hot rolling on the heated coated steel plate blank, controlling the initial rolling temperature to be more than 1020 ℃, controlling the final rolling temperature to be not less than 850 ℃, and obtaining the coated steel plate through one or more hot rolling processes according to the designed size.
6. The manufacturing method according to claim 5, wherein in the first step, the stainless steel pipe and the steel core rod are in surface contact fit with interference of 0; or the stainless steel pipe and the steel core rod are matched with each other with a gap of 0.1mm-2.0 mm.
7. The manufacturing method according to claim 5, wherein in the first step, the degree of vacuum between the stainless steel pipe and the steel core rod is equal to or less than 0.1 Pa.
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| CN114472520A (en) * | 2021-12-21 | 2022-05-13 | 西安理工大学 | Method for preparing rolling assembly of aluminum/copper/aluminum bimetal composite plate |
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