CN112126846A - Austenitic stainless steel composite steel plate and manufacturing method thereof - Google Patents

Austenitic stainless steel composite steel plate and manufacturing method thereof Download PDF

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Publication number
CN112126846A
CN112126846A CN201910583911.4A CN201910583911A CN112126846A CN 112126846 A CN112126846 A CN 112126846A CN 201910583911 A CN201910583911 A CN 201910583911A CN 112126846 A CN112126846 A CN 112126846A
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stainless steel
austenitic stainless
manufacturing
clad
composite
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杨文芬
王高天
史和生
史航
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Jiangsu Runbang New Material Group Co ltd
Nanjing Hechang New Materials Co ltd
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Jiangsu Runbang New Material Group Co ltd
Nanjing Hechang New Materials Co ltd
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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
    • 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
    • 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
    • B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • 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
    • B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B15/043—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of metal
    • 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
    • B32B15/18—Layered products comprising a layer of metal comprising iron or steel
    • 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
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/06—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the heating method
    • 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
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/08—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the cooling method
    • 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
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/10—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the pressing technique, e.g. using action of vacuum or fluid pressure
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/001—Ferrous alloys, e.g. steel alloys containing N
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
    • 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
    • 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
    • C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/26—Ferrous alloys, e.g. steel alloys containing chromium with niobium or tantalum
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/28—Ferrous alloys, e.g. steel alloys containing chromium with titanium or zirconium
    • 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
    • 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
    • B32B2250/00—Layers arrangement
    • B32B2250/40—Symmetrical or sandwich layers, e.g. ABA, ABCBA, ABCCBA
    • 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
    • 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
    • B32B2307/54—Yield strength; Tensile strength
    • 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
    • B32B2307/546—Flexural strength; Flexion stiffness
    • 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
    • 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
    • B32B2307/70—Other properties
    • B32B2307/714—Inert, i.e. inert to chemical degradation, corrosion

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Abstract

The invention discloses an austenitic stainless steel composite steel plate, which comprises a base layer and an austenitic stainless steel composite layer rolled and compounded on the base layer; the base layer comprises the following chemical elements in percentage by mass: c: 0.01-0.07%, Si more than 0 and less than or equal to 0.20%, Mn: 0.8-1.6%, Al: 0.015 to 0.03%, Ti: 0.006-0.023%, Nb: 0.008-0.025 percent, less than or equal to 0.0055 percent of N, and the balance of iron and other unavoidable impurities. In addition, the invention also discloses the austenitic stainless steel composite steel plate and a manufacturing method thereof. The austenitic stainless steel composite steel plate and the manufacturing method thereof adopt rolling compounding, so that the steel plate has excellent mechanical properties, the yield strength of the base layer is more than or equal to 450MPa, and the tensile strength is more than or equal to 580 MPa.

Description

Austenitic stainless steel composite steel plate and manufacturing method thereof
Technical Field
The invention relates to a composite steel plate and a manufacturing method thereof, in particular to a composite steel plate formed by rolling and compounding and a manufacturing method thereof, belonging to the field of composite material manufacturing.
Background
As an important steel material, the composite steel plate has the unique comprehensive performance advantages of stainless steel corrosion resistance and carbon steel mechanical property, so that the composite steel plate is widely applied to the industries of seawater desalination, heat exchangers, papermaking equipment, phosphoric acid storage tanks, flue gas desulfurization devices, power station condenser pipes, military industry, ship manufacturing and the like. Along with the rapid development of the industry in China, the improvement of the requirement on the service life of various military and civil equipment and the requirement on green environment-friendly ultralow carbon emission in the production and use processes, the performance requirement on the composite board is also improved.
In the prior art, the composite steel plate is generally compounded by adopting traditional mechanical compounding and explosion compounding, and the two processes can be separately controlled when controlling the properties of a composite plate composite layer and a base layer and then are combined together. Before compounding, the required performance of stainless steel and carbon steel may be treated to proper state and mechanical compounding force or explosion impact force is applied to combine them into one composite board. However, both of these composite methods have their own disadvantages. For example: the stainless steel compound layer and the carbon steel base layer of the mechanically compounded composite plate are not completely metallurgically bonded and are only adhered together by mechanical force, and a compound interface is easy to crack and fall off and has quick failure in the use process; the disadvantage of explosion cladding is that the requirement of the process method on the process environment is strict, the process method needs to be executed in places such as deep mountains, old forests and places with rare environmental smoke, in addition, noise, vibration and shock waves generated during explosion have great influence on the surrounding environment, and the process method is greatly limited by environmental condition factors in the current period when environmental consciousness rises. In addition, the composite plate produced by explosion cladding has lower shear strength of the cladding interface.
Disclosure of Invention
An object of the present invention is to provide an austenitic stainless steel clad steel sheet and a method for manufacturing the same, which are high in strength, excellent in cold bending properties, and corrosion-resistant by clad rolling.
In order to achieve the above purpose, the invention provides an austenitic stainless steel clad steel plate and a manufacturing method thereof, comprising a base layer and an austenitic stainless steel clad layer rolled and clad on the base layer; the base layer comprises the following chemical elements in percentage by mass:
c: 0.01-0.07%, Si more than 0 and less than or equal to 0.20%, Mn: 0.8-1.6%, Al: 0.015 to 0.03%, Ti: 0.006-0.023%, Nb: 0.008-0.025 percent, less than or equal to 0.0055 percent of N, and the balance of iron and other unavoidable impurities.
The design principle of each chemical element of the base layer of the austenitic stainless steel composite steel plate and the manufacturing method thereof is as follows:
c: carbon is an important alloying element in steel. The increase in the carbon content increases the strength and hardness of the steel sheet, but also leads to a decrease in the plastic toughness of the steel sheet. In the technical scheme of the invention, the influence of carbon on the performance of the base steel plate is comprehensively considered, and the diffusion and migration of carbon to the austenitic stainless steel clad layer during rolling and compounding are considered, so that the mass percentage of C is limited. Because the mass percent of carbon of the austenitic stainless steel adopted by the austenitic stainless steel clad layer is lower than 0.02 percent, the mass percent of carbon of the base layer is controlled to be 0.01 to 0.07 percent, so as to reduce the influence of carbon on the corrosion resistance of the stainless steel and ensure the mechanical property and the welding property of the base layer.
Si: silicon is added to the steel to improve the purity of the steel, and the silicon plays a role in deoxidation. In the technical scheme of the invention, silicon plays a role in solid solution strengthening in steel, but excessive silicon is not beneficial to the welding performance of the steel. Since the austenitic stainless steel clad layer also contains silicon, Si in the base layer is limited to 0 < Si.ltoreq.0.20%, and silicon in this range has a low influence on the corrosion resistance of the austenitic stainless steel clad layer and enables the base layer to have good weldability.
Mn: in the technical scheme of the invention, manganese plays a role in stabilizing an austenite structure, is beneficial to increasing the hardenability of steel and is beneficial to reducing the critical cooling rate of martensite formation. However, excessive manganese has a high segregation tendency, and the mass percent of manganese in the austenitic stainless steel clad layer is lower than 1.6%, so that the mass percent of Mn in the base layer of the austenitic stainless steel clad steel plate and the manufacturing method thereof is limited to 0.8-1.6%. Mn in this range does not cause adverse effects on the austenitic stainless steel clad layer, and contributes to an increase in the strength grade of the steel.
In order to further improve the strength of the austenitic stainless steel clad steel sheet and the manufacturing method thereof according to the present invention in consideration of the interaction between manganese and carbon, the mass percentage of manganese is controlled to be 1.3 to 1.6% in some preferred embodiments.
Al: in the technical scheme of the invention, Al is a strong deoxidizing element. In order to reduce the content of oxygen element in the steel, the mass percent of aluminum is controlled to be 0.015-0.03%. In addition, the excess aluminum and nitrogen elements in the steel after deoxidation can form AlN precipitates, thereby increasing the strength of the steel and refining the austenite grain size of the steel upon heating for heat treatment.
Ti: ti is a strong carbide forming element, trace Ti is added into the steel to be beneficial to fixing N in the steel, and formed TiN can ensure that the austenite grains of the base layer are not excessively grown when the composite blank is heated, and the original austenite grain size is refined. Titanium can also be combined with carbon and sulphur in steel to form TiC, TiS, Ti 4C 2S 2, respectively, which are present in the form of inclusions and second phase particles. The above carbonitride precipitates of titanium prevent the heat affected zone from growing in grains during welding, and improve the weldability. Therefore, the mass percentage of Ti is controlled to be 0.006-0.023%.
Nb: niobium is a strong carbide forming element, and in the austenitic stainless steel composite steel plate and the manufacturing method thereof, the niobium is added into the base layer mainly for improving the recrystallization temperature, so that crystal grains of the base layer can not grow rapidly after austenite recrystallization rolling is finished, and the improvement of the low-temperature impact toughness of the steel of the base layer is facilitated. Therefore, the mass percentage of Nb in the base layer of the austenitic stainless steel clad steel plate and the manufacturing method thereof is controlled to be 0.008-0.025%.
N: n is an austenite stabilizing element which is a residual amount of a steel-making gas element in the base layer, and thus the mass percentage of N in the austenitic stainless steel rolled clad steel sheet according to the present invention is controlled to be 0.0055% or less.
In the austenitic stainless steel clad steel plate and the manufacturing method thereof, the inevitable impurities are mainly S and P elements, so that P is less than or equal to 0.015 percent and S is less than or equal to 0.010 percent in a base layer.
It should be noted that, as a main impurity element affecting the impact toughness of steel, the mass percentage of the super austenitic stainless steel clad layer with respect to S needs to be controlled to 0.015% or less.
Furthermore, in the austenitic stainless steel clad steel plate and the manufacturing method thereof, the base layer also contains at least one of Ni, Cr and Mo elements, wherein Ni is less than or equal to 0.15%, Cr is less than or equal to 0.24%, and Mo is less than or equal to 0.08%.
In order to further improve the implementation effect of the austenitic stainless steel rolled clad steel plate according to the present invention, the design principle of the chemical elements is as follows:
ni: ni is an element stabilizing austenite, and contributes to further improvement of the strength of steel. In addition, the nickel is added into the steel, so that the low-temperature impact toughness of the steel can be greatly improved. Since nickel is a precious alloy element, excessive addition will increase production cost. Therefore, the mass percentage of the base layer to the nickel of the austenitic stainless steel clad steel plate and the manufacturing method thereof is limited to be less than or equal to 0.15 percent.
Cr: since the segregation tendency of chromium is small compared to manganese, the properties of the steel are improved by adding chromium when the segregation zone and the band-shaped structure are evident in the steel of the base layer. In addition, the chromium added into the base layer is also beneficial to inhibiting the chromium in the austenitic stainless steel composite layer from diffusing into the base layer. In view of this, the austenitic stainless steel clad steel plate and the manufacturing method thereof of the present invention limit the mass percentage of Cr in the base layer to be less than or equal to 0.24%.
Mo: the molybdenum can refine grains and improve the strength and toughness of the steel. In addition, the molybdenum can reduce the tempering brittleness of the steel, and very fine carbide can be separated out during tempering, so that the base matrix of the steel is obviously strengthened. In addition, the addition of molybdenum is beneficial to inhibiting the self-tempering brittleness generated in the air cooling process after the water cooling and the stop of the manufacturing method of the austenitic stainless steel composite steel plate, however, the production cost is increased due to the excessive addition of molybdenum, so the mass percentage of molybdenum in the base layer of the austenitic stainless steel composite steel plate and the manufacturing method of the austenitic stainless steel composite steel plate is limited to be less than or equal to 0.08 percent.
In the technical scheme of the invention, the austenitic stainless steel clad layer can adopt austenitic stainless steel, such as S31254(254SMo), S32654(654SMo), N08904(904L), N08367 and N08926.
Preferably, in the austenitic stainless steel clad steel sheet and the method for manufacturing the same according to the present invention, the microstructure main body of the austenitic stainless steel clad layer is austenite, the proportion of ferrite in the microstructure is not more than 4%, and the proportion of σ phase is not more than 1.5%.
Still more preferably, in the austenitic stainless steel clad steel sheet and the manufacturing method thereof according to the present invention, the phase ratio of the σ phase in the range of 0.8 to 1.2mm from the surface of the super austenitic stainless steel clad layer is not more than 0.15%.
Further, in the austenitic stainless steel clad steel sheet and the method for manufacturing the same according to the present invention, the microstructure of the base layer is bainite or bainite plus a small amount of martensite.
Furthermore, when the microstructure of the base layer is bainite and a small amount of martensite, the phase ratio of the martensite is less than or equal to 4 percent.
Furthermore, in the austenitic stainless steel composite steel plate and the manufacturing method thereof, a transition layer is arranged at the joint of the base layer and the austenitic stainless steel composite layer, and the thickness of the transition layer is less than or equal to 80 μm.
Furthermore, the yield strength of the base layer of the austenitic stainless steel composite steel plate and the manufacturing method thereof are more than or equal to 450MPa, the tensile strength is more than or equal to 580MPa, the elongation is more than or equal to 40 percent, the Charpy impact work Akv at 20 ℃ below zero is more than or equal to 120J, the Charpy impact work Akv at 40 ℃ below zero is more than or equal to 60J, and the shear strength of the austenitic stainless steel composite steel plate and the manufacturing method thereof is more than or equal to 420 MPa.
Another object of the present invention is to provide a manufacturing method for manufacturing the austenitic stainless steel clad steel sheet and the manufacturing method thereof, by which an austenitic stainless steel clad steel sheet having high strength can be obtained, and a manufacturing method thereof.
In order to achieve the above object, the present invention further provides a method for manufacturing the austenitic stainless steel clad steel plate and the manufacturing method thereof, comprising the steps of:
(1) preparing a substrate plate blank and a clad stainless steel plate blank;
(2) assembling the substrate slab and the multilayer slab: welding at least two layers of stainless steel clad plate blanks and at least two layers of substrate plate blanks into a composite blank, wherein the middle two layers are stainless steel clad plate blanks, the outer side is a substrate plate blank, and a separating agent layer is laid between the two layers of stainless steel clad plate blanks;
(3) and (3) composite rolling: heating the composite blank at 1200-1300 ℃, and then carrying out multi-pass rolling in austenite recrystallization regions of the substrate plate blank and the composite layer plate blank, wherein the final rolling temperature is not lower than 1100 ℃;
(4) immediately cooling the water after finishing the composite rolling, wherein the temperature for starting the water cooling is not lower than 1000 ℃, the final cooling temperature is 460-650 ℃, and the cooling speed is 10-100 ℃/s;
(5) and (3) straightening the composite board by heating, then cooling the composite board to room temperature in a single-sheet state by air, and then straightening by cooling.
The invention adopts austenitic stainless steel as the pairing of the clad plate blank and the substrate plate blank, and obtains the austenitic stainless steel composite steel plate with excellent comprehensive performance by applying reasonable heating, rolling and cooling process parameter design to the composite blank formed by compounding the clad plate blank and the substrate plate blank and the manufacturing method thereof.
Before the substrate slab and the multiple-layer slab are assembled, the surface of the slab needing to be compounded of the substrate slab and the multiple-layer slab is pretreated, and oxides on the surface needing to be compounded are removed, so that the compounding effect is improved. In addition, a separating agent layer is paved on the separation interface of the two-layer multi-layer plate blank and is used for smoothly separating the two clad steel plates after rolling.
In order to obtain a uniform austenitizing structure for the composite layer, the composite rolling heating temperature of the composite blank is 1200-1300 ℃, the sigma phase and carbide can be completely dissolved in the temperature range, and simultaneously, the compounds of the alloy elements in the base layer can be fully dissolved.
In order to allow the austenite recrystallization grains in the clad layer to remain without precipitation of sigma phase or carbides, and thus require water cooling immediately after the clad-rolling is completed, the water cooling may be performed in a manner known to those skilled in the art, such as DQ, ACC, or DQ + ACC. The cooling rate is controlled at 10-100 ℃/s, so that bainite structures are obtained during rapid cooling and subsequent phase transformation of the austenite crystal grains of the base layer, and the crystal grains are refined.
Further, in the manufacturing method of the present invention, in the step (4), the final cooling temperature of water cooling is 460-.
Further, in the manufacturing method of the present invention, in the step (3), the finish rolling temperature is 1140 to 1180 ℃.
The austenitic stainless steel composite steel plate and the manufacturing method thereof provided by the invention have the advantages that through the optimized component design and the process parameter control, the yield strength of the base layer of the obtained austenitic stainless steel composite steel plate and the manufacturing method thereof is more than or equal to 450MPa, the tensile strength is more than or equal to 580MPa, the elongation is more than or equal to 40%, the Charpy impact work Akv at the temperature of minus 20 ℃ is more than or equal to 120J, the Charpy impact work Akv at the temperature of minus 40 ℃ is more than or equal to 60J, and the shear strength of the austenitic stainless steel composite steel plate and the manufacturing method thereof is more.
In addition, the manufacturing method of the invention leads the clad steel plate to have excellent mechanical property and excellent corrosion resistance of austenitic stainless steel by clad rolling of the substrate plate blank and the clad plate blank.
Drawings
Fig. 1 is a photograph of a microstructure of an austenitic stainless steel clad steel sheet and a base layer according to a method for manufacturing the same.
FIG. 2 is a photograph showing a microstructure of a multi-layer austenitic stainless steel clad steel sheet and a method for manufacturing the same.
Fig. 3 is a schematic view of a composite plate interface.
1, 5-austenitic stainless steel composite steel plate and manufacturing method thereof, 2, 4-austenitic stainless steel composite steel plate and manufacturing method thereof, and 3-separating agent layer.
Detailed Description
The austenitic stainless steel clad steel sheet according to the present invention, the manufacturing method thereof, and the manufacturing method thereof will be further explained and explained with reference to the drawings and specific examples.
Example 1
The austenitic stainless steel composite steel plate comprises a base layer and an austenitic stainless steel composite layer which is rolled and compounded on the base layer; the austenitic stainless steel of the composite layer adopts S31254; the base layer comprises the following chemical elements in percentage by mass: : c: 0.01, Si: 0.20%, Mn: 0.8, Al: 0.015, Ti: 0.006, Nb: 0.008, N: 0.0055%, Mo: 0.08%, and the balance of Fe and unavoidable impurities other than P, S.
The austenitic stainless steel clad steel sheet of example 1 and the manufacturing method thereof were manufactured by the following steps:
(1) preparing a substrate plate blank and a clad stainless steel plate blank;
(2) assembling the substrate slab and the multilayer slab: welding two layers of stainless steel clad plate blanks and two layers of substrate plate blanks into a composite blank, wherein the middle two layers of stainless steel clad plate blanks are stainless steel clad plate blanks, the outer side of the stainless steel clad plate blanks is a base layer plate blank, and a separating agent layer is laid between the two layers of stainless steel clad plate blanks;
(3) and (3) composite rolling: heating the composite blank at 1200 ℃, and then carrying out multi-pass rolling in austenite recrystallization regions of the substrate plate blank and the composite layer plate blank, wherein the final rolling temperature is 1100 ℃;
(4) after finishing the composite rolling, immediately cooling by water, wherein the temperature for starting water cooling is 1000 ℃, the final cooling temperature is 460 ℃, and the cooling speed is 100 ℃/s;
(5) and (3) straightening the composite board by heating, then cooling the composite board to room temperature in a single-sheet state by air, and then straightening by cooling.
The final base layer thickness of the austenitic stainless steel clad steel plate of this example was 3mm, and the clad layer thickness was 9 mm.
In the austenitic stainless steel clad steel plate of the present example, the base layer is bainite.
The austenitic stainless steel clad steel plate of the present example has a clad layer of austenite.
The austenitic stainless steel composite steel plate of the embodiment has the advantages that the yield strength of the base layer is 475MPa, the tensile strength is 610MPa, the elongation is 43 percent, the Charpy impact work Akv at 20 ℃ below zero is 137J, the Charpy impact work Akv at 40 ℃ below zero is 123J, and the shear strength of the austenitic stainless steel rolled composite plate is 437 MPa.
Example 2
The austenitic stainless steel composite steel plate comprises a base layer and an austenitic stainless steel composite layer which is rolled and compounded on the base layer; the austenitic stainless steel of the composite layer adopts S31254; the base layer comprises the following chemical elements in percentage by mass: c: 0.03%, Si: 0.10%, Mn: 1.2%, Al: 0.020%, Ti: 0.010%, Nb: 0.015%, N: 0.0050%, Cr: 0.24 percent. The balance being Fe and unavoidable impurities other than P, S.
The austenitic stainless steel clad steel sheet of example 2 and the manufacturing method thereof are manufactured by the following steps:
(1) preparing a substrate plate blank and a clad stainless steel plate blank;
(2) assembling the substrate slab and the multilayer slab: welding two layers of stainless steel clad plate blanks and two layers of substrate plate blanks into a composite blank, wherein the middle two layers of stainless steel clad plate blanks are stainless steel clad plate blanks, the outer side of the stainless steel clad plate blanks is a base layer plate blank, and a separating agent layer is laid between the two layers of stainless steel clad plate blanks;
(3) and (3) composite rolling: firstly, heating the composite blank at 1250 ℃, and then carrying out multi-pass rolling in austenite recrystallization zones of a substrate plate blank and a composite layer plate blank, wherein the final rolling temperature is 1150 ℃;
(4) immediately cooling water after finishing the composite rolling, wherein the temperature for starting the water cooling is 1050 ℃, the final cooling temperature is 500 ℃, and the cooling speed is 90 ℃/s;
(5) and (3) straightening the composite board by heating, then cooling the composite board to room temperature in a single-sheet state by air, and then straightening by cooling.
The final base layer thickness of the austenitic stainless steel clad steel plate of this example was 2mm, and the clad layer thickness was 14 mm.
In the austenitic stainless steel clad steel plate of the present example, the base layer is bainite.
The austenitic stainless steel clad steel plate of the present example has a clad layer of austenite.
The austenitic stainless steel composite steel plate has the advantages that the yield strength of a base layer is 510MPa, the tensile strength is 645MPa, the elongation is 45 percent, the Charpy impact work Akv at the temperature of minus 20 ℃ is 142J, the Charpy impact work Akv at the temperature of minus 40 ℃ is 127J, and the shear strength of an austenitic stainless steel rolled composite plate is 465 MPa.
Example 3
The austenitic stainless steel composite steel plate comprises a base layer and an austenitic stainless steel composite layer which is rolled and compounded on the base layer; the austenitic stainless steel of the composite layer adopts S32654; the base layer comprises the following chemical elements in percentage by mass: c: 0.05%, Si: 0.05%, Mn: 1.5%, Al: 0.030%, Ti: 0.020%, Nb: 0.020%, N: 0.0045%, and the balance of Fe and unavoidable impurities other than P, S.
The austenitic stainless steel clad steel sheet of example 3 and the manufacturing method thereof are manufactured by the following steps:
(1) preparing a substrate plate blank and a clad stainless steel plate blank;
(2) assembling the substrate slab and the multilayer slab: welding two layers of stainless steel clad plate blanks and two layers of substrate plate blanks into a composite blank, wherein the middle two layers of stainless steel clad plate blanks are stainless steel clad plate blanks, the outer side of the stainless steel clad plate blanks is a base layer plate blank, and a separating agent layer is laid between the two layers of stainless steel clad plate blanks;
(3) and (3) composite rolling: firstly, heating the composite blank at 1300 ℃, and then carrying out multi-pass rolling in austenite recrystallization regions of a substrate plate blank and a composite layer plate blank, wherein the final rolling temperature is 1200 ℃;
(4) immediately cooling water after finishing the composite rolling, wherein the temperature for starting the water cooling is 1100 ℃, the final cooling temperature is 540 ℃, and the cooling speed is 80 ℃/s;
(5) and (3) straightening the composite board by heating, then cooling the composite board to room temperature in a single-sheet state by air, and then straightening by cooling.
The final base layer thickness of the austenitic stainless steel clad steel plate of this example was 2mm, and the clad layer thickness was 12 mm.
In the austenitic stainless steel clad steel plate of the present example, the base layer is bainite.
The austenitic stainless steel clad steel plate of the present example has a clad layer of austenite.
The austenitic stainless steel composite steel plate has the base layer yield strength of 560MPa, the tensile strength of 675MPa, the elongation of 44 percent, the Charpy impact work Akv at 20 ℃ below zero of 125J, the Charpy impact work Akv at 40 ℃ below zero of 118J, and the shear strength of the austenitic stainless steel rolled composite plate of 478 MPa.
Fig. 1 is a photograph of a microstructure of an austenitic stainless steel clad steel sheet and a base layer according to a method for manufacturing the same. As can be seen from fig. 1, the microstructure of the base layer is bainite.
FIG. 2 is a photograph showing a microstructure of a multi-layer austenitic stainless steel clad steel sheet and a method for manufacturing the same. As can be seen from fig. 2, the multilayer microstructure is austenite.
FIG. 3 is a microstructure photograph of a transition layer between a base layer and a clad layer of an austenitic stainless steel clad steel sheet and a method for manufacturing the same.

Claims (11)

1. An austenitic stainless steel clad steel plate and its preparation method, characterized by that, including the basic unit and rolling the austenitic stainless steel clad layer compounded on the basic unit; the base layer comprises the following chemical elements in percentage by mass: c: 0.01-0.07%, Si more than 0 and less than or equal to 0.20%, Mn: 0.8-1.6%, Al: 0.015 to 0.03%, Ti: 0.006-0.023%, Nb: 0.008-0.025 percent, less than or equal to 0.0055 percent of N, and the balance of iron and other unavoidable impurities.
2. The austenitic stainless steel clad steel sheet and the manufacturing method thereof according to claim 1, wherein the base layer further contains at least one of Ni, Cr, and Mo elements, wherein Ni is 0.15% or less, Cr is 0.24% or less, and Mo is 0.08% or less.
3. The austenitic stainless steel clad steel sheet and the manufacturing method thereof according to claim 1, wherein the microstructure of the austenitic stainless steel clad layer is mainly austenite, the proportion of ferrite in the microstructure is not more than 4%, and the proportion of sigma phase is not more than 1.5%.
4. The austenitic stainless steel clad steel sheet and the manufacturing method thereof according to claim 3, wherein the austenitic stainless steel clad layer has a phase ratio of sigma phase within a range of 0.8 to 1.2mm from the surface of not more than 0.15%.
5. The austenitic stainless steel clad steel sheet and the manufacturing method thereof according to claim 1, wherein the microstructure of the base layer is bainite or bainite + a small amount of martensite.
6. The austenitic stainless steel clad steel sheet and the manufacturing method thereof according to claim 5, wherein, when the microstructure of the base layer is bainite + a small amount of martensite, the phase ratio of martensite is 4% or less.
7. The austenitic stainless steel clad steel sheet and the manufacturing method thereof according to claim 1, wherein a transition layer having a thickness of 80 μm or less is provided at a junction of the base layer and the super austenitic stainless steel clad layer.
8. The austenitic stainless steel clad steel sheet as claimed in any one of claims 1 to 7, wherein the yield strength of the base layer is 450MPa or more, the tensile strength is 580MPa or more, the elongation is 40% or more, the Charpy impact work at-20 ℃ Akv is 120J or more, the Charpy impact work at-40 ℃ Akv is 60J or more, and the shear strength of the austenitic stainless steel rolled clad sheet is 420MPa or more.
9. The austenitic stainless steel clad steel sheet and the manufacturing method of the austenitic stainless steel clad steel sheet according to any one of claims 1 to 8, comprising the steps of:
(1) preparing a substrate plate blank and a clad stainless steel plate blank;
(2) assembling the substrate slab and the multilayer slab: welding at least two layers of stainless steel clad plate blanks and at least two layers of substrate plate blanks into a composite blank, wherein the middle two layers are stainless steel clad plate blanks, the outer side is a substrate plate blank, and a separating agent layer is laid between the two layers of stainless steel clad plate blanks;
(3) and (3) composite rolling: heating the composite blank at 1200-1300 ℃, and then carrying out multi-pass rolling in austenite recrystallization regions of the substrate plate blank and the composite layer plate blank, wherein the final rolling temperature is not lower than 1100 ℃;
(4) immediately cooling the water after finishing the composite rolling, wherein the temperature for starting the water cooling is not lower than 1000 ℃, the final cooling temperature is 460-650 ℃, and the cooling speed is 10-100 ℃/s;
(5) and (3) straightening the composite board by heating, then cooling the composite board to room temperature in a single-sheet state by air, and then straightening by cooling.
10. The manufacturing method as set forth in claim 9, wherein in the step (4), the final cooling temperature of water cooling is 460-500 ℃.
11. The manufacturing method according to claim 9, wherein in the step (3), the finish rolling temperature is 1140-1180 ℃.
CN201910583911.4A 2019-06-24 2019-06-24 Austenitic stainless steel composite steel plate and manufacturing method thereof Pending CN112126846A (en)

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