29 results about "Inconel 625" patented technology

The invention discloses a bimetal composite plate with an X90-grade composite layer made of nickel base alloy Inconel625 and a manufacturing method of the bimetal composite plate. The bimetal composite plate comprises the following chemical components in percentage by weight: base material components including C, Si, Mn, Cr, Ni, Mo, Cu, Nb, V, less than or equal to 0.05% of Al, Ti and the balance of Fe and inevitable impurity elements; the composite material comprises the following components: less than or equal to 0.08% of C, less than or equal to 0.5% of Si, less than or equal to 0.5% of Mn, 20.0-23.0% of Cr, 8.0-10.0% of Mo, 3.15-4.15% of Nb, less than or equal to 5.0% of Fe, less than or equal to 0.05% of Al, less than or equal to 0.05% of Ti and the balance of Ni and inevitable impurity elements. According to the invention, the components are comprehensively optimized, and proper rolling and tempering processes are matched to obtain the bimetal composite plate with yield strength not lower than X90 and excellent corrosion resistance for the oil and gas transmission line pipe.

This invention belongs to the field of laser surface engineering and metal matrix composite technology, and provides a Ti / Nb microalloyed Inconel 625 toughening coating, its composite powder, and preparation method. The composite powder is composed of gas-atomized Inconel 625 alloy powder, titanium powder, and niobium powder, with a Ti to Nb mass ratio of (0.8–1.2):1 and a total addition amount of 0.8–1.5 wt%. A dual-laser cladding process is employed. An initial coating is first formed by laser cladding in an inert atmosphere, followed by in-situ pulsed laser shock blasting when cooled to 900–1000℃. After slow cooling, a toughened coating is obtained. The resulting coating contains 10–20 nm dispersed Ni3(Nb,Ti) composite γ-rays. , The coating contains no Ni2(Nb,Si) Laves phase. It exhibits both high strength and high toughness, along with excellent high-temperature stability.

The invention relates to a preparation method of a diamond wear-resistant coating. The preparation method is characterized by comprising the following steps that S1, diamond brazing filler metal and wear-resistant powder are prepared; s2, after the surface of a to-be-machined workpiece is coated with diamond brazing filler metal, the to-be-machined workpiece is dried in a constant-temperature furnace, and the to-be-machined workpiece with a diamond brazing filler metal layer is obtained; and S3, laser cladding equipment is used for melting the diamond brazing filler metal layer through laser, meanwhile, an annular nozzle is matched for feeding wear-resistant powder, and the diamond wear-resistant coating formed by combining the molten diamond brazing filler metal layer and the corresponding wear-resistant powder in a cladding mode is formed on the surface of the to-be-machined workpiece. The diamond brazing filler metal is composed of, by mass, 10%-15% of diamond and 85%-90% of nickel-based brazing filler metal powder. And the wear-resistant powder is selected from one of Stellite6, Stellite12, Incone625, and Fe90 + WC wear-resistant alloy powder. The diamond wear-resistant coating is high in strength, good in wear resistance, simple and efficient.

The application belongs to the technical field of surface protection, and discloses a double-layer coating for a boiler heating surface and a preparation method thereof; wherein the double-layer coating comprises an inner layer coating and an outer layer coating; in the inner layer coating, the mass percentage of rare earth oxide is 0.1% to 0.3%, and the mass percentage of Inconel 625 is 99.7% to 99.9%; the outer layer coating is used for spraying on the surface of the inner layer coating, and in the outer layer coating, the mass percentage of Cr3C2 is 30% to 50%, and the mass percentage of Inconel 625 is 50% to 70%. The double-layer coating provided by the application has extremely excellent high-temperature chlorine corrosion resistance of the inner layer coating, and on the basis of the high-temperature corrosion resistance of the outer layer coating, the outer layer coating has extremely excellent erosion resistance, and can effectively prolong the service life of the boiler heating surface tube bundle steel.

The application provides a hot working method for significantly improving the dynamic recrystallization volume fraction of a nickel-based superalloy, which comprises the following steps: firstly, placing Inconel 625 alloy into a heat treatment furnace at 1000-1100 DEG C and keeping it for 30-90 min for solid solution treatment, and then water cooling; secondly, increasing the temperature of the Inconel 625 alloy after the solid solution treatment to 700-750 DEG C and keeping it for 50-100 h, and then water cooling while applying a stress of 100-160 MPa, so as to uniformly precipitate a delta phase; and finally, increasing the temperature of the Inconel 625 alloy after the aging heat treatment to 870-950 DEG C and keeping it for 2-10 min, and then hot deforming the alloy at a strain rate of 0.1-0.001 s ‑1 The application can obtain a large amount of uniformly distributed delta phase with appropriate size in a short time by applying an external stress, avoids the problem of the delta phase being distributed along the grain and being coarse in size caused by traditional aging heat treatment, ensures that the delta phase fully plays a role in the subsequent hot deformation process by using appropriate process parameters, greatly improves the dynamic recrystallization volume fraction, and has obvious advantages in grain refinement and uniform structure in the hot working process of the nickel-based superalloy.

The present application relates to a kind of low stress gradient annealing process of X65 steel / Inconel625 composite plate, belong to the heat treatment technical field of metal composite material, it is applicable to the structure regulation and interface strengthening of hot-rolled composite material.The process includes three stages in turn: the first stage is kept at 20~50 ℃ below X65 steel recrystallization temperature, time t1 satisfies t1=2~4 min / mm, protective atmosphere is nitrogen hydrogen mixed gas;Second stage is kept at 20~50 ℃ below Inconel625 nickel-based alloy recrystallization temperature, time t2=(0.6~0.8) t1, protective atmosphere is vacuum;Cooling stage is cooled at the cooling rate V2≥15 ℃ / min in 650~700 ℃ interval, at other stages with rate V1≤30 ℃ / h cooling to 300 ℃, protective atmosphere is high-purity argon.The present application can significantly improve the interface bonding strength of composite plate, reduce residual stress and improve the stability of organization, provide high reliability composite plate for petroleum and natural gas, chemical equipment and marine engineering and other fields.

The invention relates to the technical field of manufacturing of square throttle valve forgings, in particular to a production and manufacturing process of Inconel 625 square throttle valve forgings for deep sea oil and gas exploitation, which comprises the following steps: firstly, selecting proper raw materials according to an alloy formula of the square throttle valve forgings, smelting the raw materials into an electroslag ingot through a smelting process, and then treating the surface of the electroslag ingot, oxide skin and defects are removed; secondly, the step forging process is innovated, through the collaborative design of three-heating-number cogging forging and two-heating-number cutting forging and the combination of the large reduction rate and multidirectional deformation of the first pass, the strain penetration depth of the thick section is remarkably increased, compared with a traditional process, the effective strain cumulant is greatly increased, the problem that deformation at the corners of the square valve is not uniform is thoroughly solved, and the yield of the square valve is improved. And a narrow temperature area is accurately controlled, the finish forging temperature is monitored in real time by adopting an infrared thermometer, and a forgeable temperature window is stably controlled within the range of 170-200 DEG C in cooperation with die preheating and graphite lubrication, so that the risk of microcracks caused by the finish forging temperature less than 950 DEG C is avoided.

The application discloses a rolling method of Inconel 625 / X65 composite plate. The rolling composite plate blank comprises Inconel 625 nickel-based alloy, two pieces of X65 low alloy steel base materials after being opened and reduced, and pure Ni sheet; after the composite material and the surface to be compounded are mechanically processed, the base material, the Inconel 625 composite layer, the Ni sheet and the base material are sequentially stacked and assembled into an asymmetric composite blank in sequence, and the compression ratio of the effective steel and iron base material is 8.75-9.77, which is 25%-39.5% larger than the compression ratio of the conventional symmetric assembly rolling, so that the base material of the composite plate has excellent low-temperature toughness. At the same time, the Inconel 625 composite layer is always located in the inside of the composite blank during the rolling process, so that the temperature of the Inconel 625 composite layer falls in the sensitization temperature range during the rolling process.

The invention relates to a low-stress gradient annealing process of an X65 steel / Inconel 625 composite plate, belongs to the technical field of heat treatment of metal composite materials, and is suitable for structure regulation and interface strengthening of hot-rolled composite materials. The process sequentially comprises three stages, in the first stage, heat preservation is conducted at the temperature 20-50 DEG C below the recrystallization temperature of the X65 steel, the time t1 meets the condition that t1 = 2-4 min / mm, and the protective atmosphere is nitrogen and hydrogen mixed gas; in the second stage, heat preservation is conducted at the temperature 20-50 DEG C below the recrystallization temperature of the Inconel 625 nickel-based alloy, the time t2 is equal to (0.6-0.8) t1, and the protective atmosphere is vacuum; in the cooling stage, the cooling rate V2 is larger than or equal to 15 DEG C / min in the interval of 650-700 DEG C, in the other stages, cooling is conducted to 300 DEG C at the rate V1 smaller than or equal to 30 DEG C / h, and the protective atmosphere is high-purity argon. The interface bonding strength of the composite board can be remarkably improved, the residual stress is reduced, the structure stability is improved, and the high-reliability composite board is provided for the fields of petroleum and natural gas, chemical equipment, ocean engineering and the like.

The invention discloses a flux-cored wire for inhibiting element interdiffusion between a steel pipe column and a coating and a preparation method thereof, and belongs to the technical field of high-temperature alloy surface engineering technology.The flux-cored wire comprises a metal type flux-cored powder and an alloy tape skin, wherein the alloy tape skin is an Inconel 625 nickel-based alloy tape skin.The powder packaging rate of the flux-cored wire is 20-25 wt.%.The invention adopts a manual TIG welding process to perform cladding on the surface of a Q345 low-alloy steel, argon can effectively isolate air around a welding molten pool, oxidation and nitridation of molten pool metal is avoided, a tungsten electrode arc is stable, the melting depth is relatively shallow, heat input in the welding process is easy to adjust, the forming quality of a cladding layer is high, full-position welding is suitable, and the invention is suitable for preparation of the cladding layer.

The invention belongs to the technical field of electric arc additive manufacturing, and particularly relates to a preparation method of a WC particle reinforced electric arc additive manufacturing Inconel 625 gradient material, a Q235 steel plate is used as a base material, an Inconel 625 nickel-based alloy is used as a welding wire, electric arc additive manufacturing is completed in a layer-by-layer deposition mode, four gradient areas are divided from bottom to top in the stacking direction, each gradient area is provided with one to seven deposition layers, and the deposition layers are arranged in the four gradient areas. The addition amount of the WC powder in each deposition layer in one gradient area is consistent, and the addition amounts of the four gradient areas are respectively 35wt%, 25wt%, 15wt% and 5wt% from low to high along the stacking direction to form gradient distribution. According to the method, the technical prejudice is overcome, a uniform reinforced phase distribution or simple mechanical layering strategy commonly adopted in traditional composite material manufacturing is abandoned, the service requirement of toughness and strength balance is considered, and the gradient change of the addition amount of WC from high to low from a substrate to the top of a component is achieved.

The invention discloses a corrosion-resistant and wear-resistant IN625-based composite high-entropy alloy and a preparation method thereof, and belongs to the technical field of wear-resistant and wear-resistant high-entropy alloys, CoCrFeNiMo high-entropy alloy components are introduced into an Inconel 625 matrix by adopting a wire arc additive manufacturing process, and the corrosion-resistant and wear-resistant IN625-based composite high-entropy alloy is prepared. According to the method, by controlling the adding amount of the CoCrFeNiMo high-entropy alloy components, the electrochemical uniformity of the alloy surface is optimized, and formation of a more stable compact passive film is promoted. And by reducing component fluctuation between a matrix and a precipitated phase, inter-phase micro galvanic corrosion driving force can be remarkably inhibited, so that the material shows more excellent thermodynamic stability and chemical protection performance in a chlorine-containing corrosive medium.

The invention discloses an interlayer cooling and printing strategy collaborative strengthening electric arc additive manufacturing alloy method, and belongs to the technical field of additive manufacturing, and the method comprises the following steps: aiming at Inconel 625 alloy, firstly cleaning a substrate, and adopting two-stage grouped interval printing: two continuous welding beads form a group, the group is spaced by two widths, and the two welding beads form one group; a basic welding bead is printed and directionally cooled for 5 s, and then the repair welding bead is reversely filled and cooled for 25 s; and in cooperation with a three-layer circulation rotation strategy, 180-degree reverse deposition is conducted on the first layer and the second layer, clockwise 90-degree rotation deposition is conducted on the third layer, and the equiaxed crystal-columnar crystal alternating heterogeneous component is manufactured in a circulation mode. According to the method, a gradient heterogeneous structure is formed through cooperative regulation and control of the path and the rotating and cooling time sequence, dispersion and precipitation of MC type carbide are promoted, high-density pre-dislocation is introduced, multi-element strengthening is achieved, the high-temperature mechanical property is greatly improved, and the yield strength at the temperature of 650 DEG C and the yield strength at the temperature of 800 DEG C are improved by 191% and 154.55% respectively compared with a traditional process. The process does not need additional equipment and subsequent heat treatment, and is suitable for industrial preparation of large-size components.

The invention relates to a method for avoiding crystal mixing of an Inconel 625 forge piece and a product of the Inconel 625 forge piece. The method comprises the steps that rolling is conducted, specifically, a forge piece is heated to the temperature T DEG C for a preset time, then multi-heating-number rolling is conducted on the forge piece, the deformation amount of each heating number is controlled not to exceed D, and when T ranges from 1080 DEG C to 1150 DEG C, D ranges from 30% to 45%; and when T is less than 1080 DEG C, D = (-0.34 T + 370) * 100%, and if the calculated D is less than 15%, the value of D is 15%.

The application discloses a method for controlling the microstructure of an in-situ NbC reinforced Inconel 625 composite coating by laser remelting. The method is operated on a substrate for N times according to the following steps: under a protective gas, composite powder is deposited on the surface of the substrate by laser cladding to form a composite coating, and then the composite coating is subjected to 1-2 times of laser remelting treatment. The method can effectively ensure the uniformity of the microstructure of the in-situ NbC reinforced Inconel 625 composite coating, improve the microhardness, wear resistance and high-temperature oxidation resistance, and the average microhardness HV is up to 379.1 HV, the friction coefficient COF is as low as 0.4992, and the oxidation kinetic constant Kp is as low as 0.0883.

The invention provides a high-toughness nickel-based welding wire, a preparation method and a groove form, and belongs to the technical field of metal materials. The high-toughness nickel-based welding wire comprises powder and a welding skin, and the powder comprises 22.0%-25.0% of Fe, 25.0%-30.0% of Cr, 10%-15% of Co, 1.0%-2.0% of Nb, 3.0%-5.0% of Al, 5.0%-7.0% of V, 5.0%-7.0% of W, 3%-5% of Mo, 0.5%-1.0% of B, 0.5%-1.0% of Zr, 0.4%-0.8% of CeO2, Y2O3, La2O3 and the balance Ni. And the welding skin is an Inconel 625 nickel strip. Optionally, the particle size of the medicine powder is 100 to 200 meshes. The solid solution strengthening effect is achieved by designing a weld joint alloy system with solid solution strengthening as a main part and precipitation strengthening as an auxiliary part, wherein the weld joint alloy system comprises various alloy elements such as Cr, Co, Mo, Nb, V and W; al is added to form a certain amount of gamma'strengthening phase, and B, Zr and rare earth oxide are added to remarkably improve the grain boundary bonding strength, so that a finally formed welding seam is excellent in obdurability.

The present disclosure relates to an armor packaging for a cable comprising an inner armor layer and an outer armor layer, the inner armor layer and the outer armor layer formed by armor wires made from an alloy material with high acid resistance. The alloy material may, for example, be selected from the group of Inconel 625, Inconel 825, Incoloy 27-7MO, HC265, C-276, and MP35N. In addition, the cable may include an acid isolation polymer layer disposed radially between the inner armor layer and an outer armor layer of the armor packaging.

The utility model provides a point rail based on a laser cladding gradient coating structure. The point rail comprises a point rail metal base body, an interface bonding strengthening layer, a toughness impact-resistant layer, a wear-resistant strengthening layer, a corrosion-resistant strengthening layer and a surface function optimization layer. The interface bonding strengthening layer is made of Fe320, the toughness impact-resistant layer is made of BH350 bainite steel, the wear-resistant strengthening layer is made of 40Cr steel, the corrosion-resistant strengthening layer is made of Inconel 625, and the surface function optimizing layer adopts copper powder as a conducting layer. According to the gradient coating structural design, the hardness, the abrasion resistance, the impact resistance, the corrosion resistance and the conductivity of the point rail are improved, the service life of the point rail is prolonged, the frequency of maintenance and replacement is reduced, and the operation cost is reduced. According to the gradient coating structure design achieved through the laser cladding technology, all the layers are tightly combined, a composite structure with excellent overall performance is formed, and a more reliable and efficient solution is provided for use of the coating.

The invention discloses a laser melting forging method of a Si3N4 / Y2O3 reinforced nickel-based composite material and a coating, and belongs to the technical field of laser surface engineering. The method comprises the following steps: firstly, mixing alpha-Si3N4, Y2O3 and Inconel 625 nickel-based alloy powder to prepare a composite powder material; and then under the protective atmosphere, the powder material is conveyed to the surface of the pretreated base body, cladding laser is adopted to form a molten pool, pulse laser is synchronously adopted to conduct in-situ impact forging on the molten pool or a pasty area at the solid-liquid interface of the molten pool, and finally cooling is conducted to obtain the coating. According to the invention, through the synergistic enhancement effect of alpha-Si3N4 and Y2O3 and the combination effect of a laser melting forging process, crystal grains are refined in the coating, interface defects are eliminated, and residual compressive stress is introduced, so that the obtained coating combines high hardness and high strength and toughness, laser cladding manufacturing defects are reduced, wear resistance is improved, and the service life of the coating is prolonged. The method is especially suitable for surface strengthening of high-temperature wear-resistant parts in the fields of aerospace and energy power.

The invention discloses a nano lanthanum oxide modified Inconel 625 nickel-based superalloy and a preparation method thereof, and belongs to the technical field of metal additive manufacturing and superalloy materials.La2O3 particles with the particle size being 30-50 nm and Inconel 625 alloy powder with the particle size being 53-105 [mu] m are evenly dispersed through a ball-milling powder mixing technology, and then the nano lanthanum oxide modified Inconel 625 nickel-based superalloy is prepared through laser directional energy deposition forming; wherein the addition amount of La2O3 particles is 0.3 wt.%-0.9 wt.%, and the addition of a proper amount of La2O3 can promote grain refinement of a gamma-Ni matrix in the solidification process, relieve segregation of Nb / Mo among dendritic crystals and remarkably reduce formation of Laves phases and MC carbides, so that a microscopic structure is more uniform, the tensile strength and the ductility are both superior to those of a control sample without addition of La2O3, and synergistic improvement of strength and toughness is achieved. The method has the advantages of being small in addition amount, simple in process and remarkable in performance improvement, and a new technical approach is provided for structure regulation and performance optimization of the nickel-based high-temperature alloy in the field of additive manufacturing.

The application discloses a laser fused forming Inconel 625 alloy differential heat treatment method based on deposited state non-equilibrium organization characteristics, and relates to the technical field of metal additive manufacturing and heat treatment. The laser fused forming deposited state Inconel 625 alloy is heated to 700 DEG C at a room temperature with a temperature rising rate of 10 DEG C / min, and is kept for 13 hours; or the laser fused forming deposited state Inconel 625 alloy is heated to 1150 DEG C, kept for 1 hour, then cooled to 700 DEG C at a cooling rate of 50 DEG C / h, kept for 19 hours, then cooled to 600 DEG C at a cooling rate of 50 DEG C / h, kept for 24 hours, and then cooled to the room temperature. The application abandons the traditional 'complete homogenization' treatment concept, takes the columnar crystal, cellular substructure in the deposited state organization and Nb and Mo microsegregation enriched along the cellular boundary as available organization genetic precursors, realizes the customized synergistic regulation of mechanical properties and corrosion resistance through 'genetic utilization' or'reconstruction optimization' two paths.

The invention provides a high-strength and high-toughness welding wire for a nickel-based material, a preparation method and a welding process, and belongs to the technical field of metal materials. The high-strength and high-toughness welding wire comprises a flux core and a welding skin, the flux core comprises 40%-48% of Ni powder, 4%-6% of Nb powder, 8%-12% of Ta powder, 4%-6% of Mo powder, 4%-6% of Ti powder, 6%-9% of Al powder, 8%-12% of W powder and the balance Cr powder. The welding skin is an Inconel 625 belt, and the filling rate of the flux core ranges from 18% to 21%. According to the nickel-based welding wire, the Ni-Cr-Ti-Al alloy components are reasonably designed, the gamma'phase precipitation strengthening effect consistent with that of base metal is obtained, the welding wire is matched with the base metal GH2070P in strength and toughness, and the problem that a connector obtained by welding GH2070P through an existing 617 welding wire is poor in bending performance is effectively solved.

A bimetallic composite coiled tubing for gas lift operation comprises a base layer and a composite layer arranged outside the base layer, and the base layer and the composite layer are welded to form a tubing body. The outer diameter of the pipe body is phi 25.4 to 50.8 mm, and the length of the single pipe body is 1000 to 2000 m; the base layer is made of low-carbon steel, and the thickness of the base layer is 2-3mm; the composite layer is made of Inconel 625 nickel base alloy, and the thickness of the composite layer ranges from 1 mm to 1.5 mm. The bimetallic composite coiled tubing for gas lift operation is manufactured, the problem that an existing carbon steel coiled tubing is poor in corrosion resistance is solved, and therefore support is provided for development of acid oil and gas fields.

The invention relates to the technical field of high-temperature alloy hot working, and discloses a manufacturing process of a high-temperature Inconel 625 die forging valve body, which comprises the following steps of: carrying out stepped heating on an alloy blank; the heated blank is coated with a high-temperature heat preservation lubricant, two-heating-number forging is carried out, and heat preservation treatment is carried out between heating numbers; and carrying out rapid solution heat treatment on the forged workpiece, wherein the heat treatment comprises the steps of ultrafast heating and rapid water quenching. The thermal stress is reduced through stepped heating, the plasticity is recovered and the structure is refined through two-heating-number forging and inter-heating-number heat preservation, and sensitization and harmful phase precipitation are inhibited through rapid solid solution heat treatment. By the adoption of the process, the Inconel 625 forged piece which is free of macroscopic defects, small in structure and good in strength and plasticity matching and has excellent low-temperature toughness and intergranular corrosion resistance at the same time can be prepared.

The invention provides a nickel-based aging strengthening type welding material for inhibiting liquefaction cracks and a welding process. The nickel-based aging strengthening type welding material comprises a transition layer and a welding wire, wherein the laser cladding powder for the transition layer comprises 16.0%-20.0% of Cr powder, 35.0%-40.0% of Fe powder, 5.0%-10.0% of Co powder, 1.0%-2.0% of Mo powder, 2.0%-2.5% of Ti powder, 2.0%-2.5% of Al powder and the balance Ni powder, and the welding wire comprises powder and a welding skin; wherein the powder comprises 50.0% to 60.0% of Fe, 8.0% to 10.0% of Cr, 3.0% to 6.0% of Nb, 6.0% to 8.0% of Al, 6.0% to 8.0% of Ti, 1.0% to 2.0% of Cu, 0.4% to 0.8% of Y2O3 and La2O3 and the balance Ni, and the welding strip is an Inconel 625 nickel strip. A heat affected zone of a connector obtained through the welding wire is free of liquefied cracks, the whole connector is high in strength and good in plasticity and toughness, and the problems that when an existing 617 welding wire is used for welding aging strengthening base metal, liquefied cracks occur, and the performance of the connector is not matched are solved.

The invention discloses a method for preparing a nickel-based alloy additive body with gradient hardness based on an electric arc additive manufacturing technology, which changes a block structure obtained by a traditional deposition strategy by changing a printing path, adopting an interval printing mode and adjusting a cooling condition during printing. The hardness of the additive body in the construction direction and the direction perpendicular to the moving direction of the welding gun is changed in a gradient mode, and the material performance is more uniform at all positions. The hardness of the prepared block-shaped additive body at different positions is different, the whole block-shaped additive body is in gradient hardness change similar to a trigonometric function, the problem that in the process of preparing the Inconel 625 alloy additive body through an additive manufacturing method, the hardness of all areas is not uniform, and failure is prone to occurring is effectively solved, and the method is high in efficiency, low in cost and suitable for industrial production.

The invention relates to the technical field of stainless steel pipes, in particular to a high-corrosion-resistance stainless steel composite pipe and a preparation method thereof.The preparation method of the stainless steel composite pipe comprises the following steps that Inconel 625 alloy is rolled, welded and cleaned, and an outer pipe is obtained; stainless steel is rolled, welded, cleaned and subjected to sand blasting, and an inner pipe is obtained; after the casing pipe is assembled, the space between the inner pipe and the outer pipe is filled with bonding powder, and a composite pipe blank is obtained; drawing and reducing to obtain a stainless steel composite pipe; the bonding powder comprises tin powder, nickel powder, molybdenum powder, copper powder and nano titanium carbide powder; the method has the advantage that the corrosion resistance and the mechanical property of the stainless steel composite pipe are improved.

This invention belongs to the field of metal materials technology and provides a method for preparing a composite plate of Inconel 625 nickel-based alloy and X65 pipeline steel, including billet assembly, welding, heating, rolling, and cooling; adopting a multi-pass gradient rolling + staged gradient cooling process, controlling the bainite content in the phase transformation products to reach 60%~70%, so that the composite plate does not delamination failure when the bending radius reaches 2.5 times the plate thickness, the interface diffusion layer thickness is 8~12µm, and the shear strength is increased to over 350MPa.

The invention belongs to the technical field of manufacturing of high-strength corrosion-resistant structural steel, and particularly relates to an X70-grade bimetal composite plate with a composite layer made of nickel-based alloy Inconel 625, a base material is X70 pipeline steel, a composite material is made of the nickel-based alloy Inconel 625, the base material comprises the following chemical components in percentage by weight: 0.02%-0.08% of C, 0.15%-0.25% of Si, 0.65%-1.95% of Mn, 0.05%-0.35% of Cr, 0.05%-0.25% of Ni, 0.05%-0.35% of Mo, 0.1%-0.2% of Cu, 0.06%-0.08% of Nb, less than or equal to 0.05% of Al and 0.06%-0.08% of Ti, and the balance of Fe and inevitable impurities. The balance is Fe and inevitable impurity elements; the composite material comprises less than or equal to 0.08% of C, less than or equal to 0.5% of Si, less than or equal to 0.5% of Mn, 20.0%-23.0% of Cr, 8.0%-10.0% of Mo, 3.15%-4.15% of Nb, less than or equal to 5.0% of Fe, less than or equal to 0.05% of Al, less than or equal to 0.05% of Ti and the balance Ni and inevitable impurity elements. The composite material has the advantages of excellent corrosion resistance and mechanical properties, and high production efficiency.