332 results about "Weldability" patented technology

The invention discloses high-performance bridge steel and a production method thereof, and belongs to the technical field of ferrous metallurgy. The bridge steel comprises the following chemical components in percentage by mass: 0.09%-0.11% of carbon; silicon: less than or equal to 0.55%; 1.4%-1.6% of manganese; less than or equal to 0.018% of phosphorus; sulfur: < = 0.005%; 0.15% to 0.20% of niobium; less than or equal to 0.08% of vanadium; 0.006% to 0.03% of titanium; 0.01 to 0.02 percent of chromium; 0.01% or less of nickel; less than or equal to 0.3% of copper; 0.01% to 0.045% of aluminum; less than or equal to 0.3% of molybdenum; not more than 0.008% of nitrogen; and the balance of iron and inevitable impurities. According to the high-performance bridge steel and the production method thereof, by optimizing the component design and the production process, production of the bridge steel with high strength, low yield ratio, high toughness and good welding performance can be achieved.

The invention discloses a production method of anti-acid pipeline steel X70MS. The technological process comprises converter smelting, refining, continuous casting, heating rolling, cooling and inspection warehousing, the produced anti-acid pipeline steel has high strength, good toughness, excellent low-temperature toughness, excellent HIC and SSCC resistance and excellent machining performance and welding performance, the yield strength of the steel is 485-560 Mpa, the tensile strength is 580-680 Mpa, the yield ratio is smaller than or equal to 0.88, and the yield ratio is smaller than or equal to 0.88. The plate thickness low-temperature impact toughness Akv is greater than or equal to 230J, the crack-arrest drop hammer temperature is-30 DEG C, the toughness area is greater than or equal to 88%, and the HIC resistance CLR is less than or equal to 5%, CTR is less than or equal to 1%, and CSR is less than or equal to 1%. And the 90% yield strength load SSCC is qualified.

The invention discloses a rolling process method for Q355C, D and E grade steel plates with the thickness of 100-150 mm. The rolling process method comprises the following steps that raw materials are prepared and smelted; the molten steel is transferred into an LF furnace for refining, lime and fluorite slagging materials are added, the refined molten steel is transferred into a VD furnace for vacuum degassing treatment, and the vacuum degree is smaller than or equal to 67 Pa; continuous casting: carrying out continuous casting or die casting on the molten steel subjected to vacuum degassing for pouring, and controlling the pouring temperature to be 1550-1560 DEG C; heating: feeding the casting blank into a heat accumulating type heating furnace for heating, and controlling the heating temperature to be 1200-1240 DEG C; the heated casting blank is subjected to normalizing rolling, and in the rolling process, high-pressure water is used for reducing the surface temperature of the steel blank; cooling, wherein the rolled steel plate is subjected to accelerated cooling, and the water entering temperature is 890-910 DEG C; and stack cooling is conducted, specifically, the rolled steel plate is subjected to stack cooling, and the stack cooling temperature is higher than 420 DEG C. The Z-direction performance of the developed steel plate reaches Z35 through reasonable component design and the normalizing rolling and NCP technology, and the steel plate has good obdurability matching and welding performance.

The invention relates to high-toughness easy-to-weld carbon-free steel for ocean engineering and a preparation method, belongs to the technical field of steel smelting, and aims at solving at least one of the problems that the strength, toughness and welding performance of existing carbon-free steel cannot be considered at the same time, the production cost is low, the process is complex, and the production period is long. The invention relates to high-toughness easy-to-weld carbon-free steel for ocean engineering. The carbon-free steel comprises the following chemical components in percentage by mass: less than or equal to 0.01% of C, 0.10-0.35% of Nb, 0.05-0.15% of Mo and the balance of Fe and inevitable impurities. The strength bottleneck of carbon-free steel is broken through, and the balance of high strength and excellent toughness is achieved. Through the casting blank ultra-fast cooling and ferrite area rolling process and in combination with the Nb-Mo alloy design, the tensile strength is improved to 500 MPa or above, meanwhile, the impact energy at the temperature of-80 DEG C is larger than or equal to 200 J, and the problem that traditional steel depends on carbon element strengthening, and consequently obdurability matching is insufficient is solved.

The object is to provide a Fe-Ni-Cr alloy for a sheathed heater jacket pipe which is excellent in oxidation resistance, corrosion resistance, and weldability, and which can be used in a humid high-temperature environment. The alloy for solving the object is a Fe-Ni-Cr alloy consisting of, in mass%, C: 0.001 to 0.050%, Si: 0.18 to 1.00%, Mn: 0.20 to 0.80%, P: 0.030% or less, S: 0.0001 to 0.0020%, Ni: 12 to 21%, Cr: 18 to 24%, Mo: 0.20 to 1.50%, Cu: 0.30% or less, Al: 0.10 to 0.70%, Ti: 0.10 to 0.70%, N: 0.002 to 0.015%, B: 0.0001 to 0.0010%, O: 0.0002 to 0.0030%, Ca: 0.002% or less, REM: 0.0010 to 0.0150% of one or two or more of La, Ce, and Y, and the balance of Fe and inevitable impurities, and satisfies formulae 1 and 2. 0.575 x Ni + 1.25 x Cr + 3.43 x Mo - 39 x P - 5.3 x Al - 64 1 x REM - 1018 x O ≥ 20.0 … (Formula 1). 1.5 x Mn + 41.3 x Si + 1469 x S - 1.67 x Al - 1.34 x Ti - 150 x O - 620 x REM ≥ 5.0 … (Formula 2).

The present application relates to a kind of weld reinforcement structure for stainless steel tank, belong to aerospace vehicle propellant tank structure technical field;First tank bottom, first short shell, barrel section, second short shell and second tank bottom;Wherein, first tank bottom and second tank bottom are hemispherical shell structure;First short shell, second short shell, barrel section are barrel section structure;First short shell, barrel section and second short shell are in turn horizontal coaxial butt joint;First tank bottom is coaxially installed at the axial outer end of first short shell;Second tank bottom is coaxially installed at the axial outer end of second short shell;The open end of first tank bottom is inserted into first short shell, and the outer wall of first tank bottom is butt joint with the inner wall of first short shell;The open end of second tank bottom is inserted into second short shell, and the outer wall of second tank bottom is butt joint with the inner wall of second short shell;The present application solves the problem that the welding performance of reinforcing material cannot be reinforced by partition thickness design, realizes the purposes such as high performance, low cost manufacturing of stainless steel tank.

This application provides a case, a battery, and an electric device. The case includes a bottom plate having a composite plate and a heat exchange plate. The composite plate is made of a first material portion and a second material portion, and includes a first welding surface formed from the first material portion. The heat exchange plate has a second welding surface made of a third material, where the third material is the same as the first material. The first and second welding surfaces are welded together. By using the composite plate instead of a conventional aluminum plate, the design improves weldability between the composite plate and the heat exchange plate, thereby reducing quality issues and improving manufacturing reliability of the case.

The present application relates to the technical field of steel material welding, and particularly relates to a welding method of Q690S high-strength steel for a hydropower station pressure pipeline. The present application comprehensively covers the welding joint form and thickness specification of the hydropower station pressure pipeline manufacturing and installation, solves the application problems of poor weldability of Q690S high-strength steel, low welding efficiency, difficult guarantee of welding joint performance, and easy generation of delayed cracks after welding, and the technical scheme is simple, has strong applicability, and the implementation effect meets the design technical conditions of large and super-large hydropower station pressure pipelines, and can be practically used for the welding manufacturing and welding installation in field environment of Q690S high-strength hydropower pressure pipeline.

The application discloses a rare earth high-strength dual-phase steel and a forming method and application thereof, and belongs to the technical field of dual-phase steel. The forming method of the rare earth high-strength dual-phase steel comprises the following steps: converter smelting, LF refining, RH refining, adding cerium iron and yttrium iron at the end of the RH refining or before continuous casting, continuous casting, three-stage hot rolling, cold rolling and three-stage annealing. The rare earth high-strength dual-phase steel has good cold stamping formability, high weldability, no rare earth element segregation, no cracking of steel forming, high yield, and can be directly used to prepare automobile bodies after cold stamping forming at normal temperature. There is no rare earth inclusion or coarse carbon nitride brittle bulk agglomerate on the surface layer of the weld, the rare earth element is in a dispersed distribution state, has excellent dispersion strengthening effect, the weld is not prone to cracking, and the mechanical properties of the weld are superior to those of the base material.

The application discloses an aluminum nitride film circuit substrate and a preparation method thereof, and relates to the technical field of aluminum nitride substrates.The application is characterized by the following steps: a titanium film is plated on the surface of an aluminum nitride ceramic substrate by magnetron sputtering, and then a copper film is plated on the surface of the titanium film by magnetron sputtering; and a nickel film is plated on the surface of the copper film by a chemical plating method to prepare the aluminum nitride film circuit substrate.Through the titanium-copper gradient dynamic transition technology, a gradient alloy layer is formed to reduce the interface stress; the titanium and the surface of the aluminum nitride are combined through a chemical bond to form a dense transition layer, thereby relieving the difference in the thermal expansion coefficient; the copper enhances the conductive performance of the surface of the aluminum nitride ceramic substrate; the titanium compensates for the interface defects of the mismatch between the copper and the aluminum nitride ceramic lattice; the chemical nickel plating enhances the hardness and corrosion resistance of the aluminum nitride ceramic substrate, and the aluminum nitride film substrate is endowed with weldability and bondability.

The application discloses a production method of low-cost thick-gauge welding structural steel plate ASTM A36, the steel plate contains the following chemical components in percentage by mass: C: 0.13-0.15%, Si: 0.18-0.25%, Mn: 0.85-0.95%, P: <=0.025%, S: <=0.010%, Als: 0.20-0.35%, CEV: <=0.32%; the rest is iron and inevitable impurities; and the production process of the steel plate is desulfurization, converter smelting, LF refining, continuous casting, heating, rolling, cooling, hot straightening, shearing and sampling inspection. The hot rolling process is adopted, the performance and welding performance meet the standard and user use requirements. The narrow component control is adopted, the rolling and cooling process are accurately controlled, and it is ensured that the steel plate has excellent performance, in particular, the thickness performance and weldability meet the high standard requirements of users.

The application discloses a 700MPa-grade CSP short-process hot-rolled high-weather-resistance container steel and a production method thereof. The chemical components of the steel include C: 0.02-0.06%, Si: 0.20-0.65%, Mn: 1.1-1.8%, P: 0.035-0.15%, S: ≤0.008%, Cu: 0.20-0.55%, Sb: 0.02-0.25%, Ti: 0.10-0.18%, N ≤0.005%, and the balance is balanced iron and inevitable impurities, wherein the carbon equivalent CEV is controlled to be ≤0.35%. The preparation mainly includes the converter smelting, the LF ladle furnace refining, the thin slab continuous casting and rolling, the laminar cooling and the coiling steps. The container steel obtained by the application has good mechanical properties, corrosion resistance, welding performance, forming performance and cost advantage, realizes the lightweight and long service life of the container, and is suitable for popularization and application.

This invention discloses a production method for 40-80mm thick Q420N series high-strength wind power equipment steel plates, comprising the following steps: Step 1: smelting and continuous casting; Step 2: slab heating; Step 3: high-pressure water descaling; Step 4: controlled rolling process; Step 5: cooling; Step 6: heat treatment, wherein the slowly cooled steel plate undergoes surface shot blasting to remove oxide scale, and then is subjected to a normalizing and weak water cooling process in a quenching furnace; the invention also defines the chemical composition of the Q420NE series steel plate by mass percentage. By optimizing the chemical composition design and coordinating controlled rolling and cooling processes, and adopting normalizing rapid cooling technology (NAC), this invention achieves a unified high strength, high toughness, excellent weldability, and thickness-direction uniformity in the steel plate without relying on a large amount of precious alloys, meeting the requirements of the harsh service environment of wind power equipment.

Another embodiment of the present disclosure provides a lead tab comprising: a metal substrate including aluminum; and a metal layer disposed on both sides of the metal substrate; wherein the metal layer comprises 70 to 99.9 wt % of chromium and wherein the lead tab has a laser welding strength of 40 kgf / mm2 or more.

The invention discloses a titanium / steel welding method based on a laser cladding transition layer, and belongs to the technical field of titanium alloy and stainless steel dissimilar metal connection manufacturing. The method comprises the steps that vanadium powder serves as a cladding material, a vanadium metal transition layer is prepared on the end face of the titanium alloy through the laser cladding technology, and then a workpiece obtained after cladding is completed is subjected to pretreatment including stress relief treatment, surface machining and cleaning; and finally, the titanium alloy and vanadium transition layer and stainless steel are subjected to laser assembly welding. The transition layer interface prepared through laser cladding is in a metallurgical bonding mode, the compatibility of dissimilar materials on the two sides is achieved through the component gradient structure of the transition layer, and then the weldability of titanium alloy and stainless steel and the performance of a connector are greatly improved; and meanwhile, the method has certain general applicability, has a relatively good reference value in the field of connection of other heterogeneous materials, and provides an effective breakthrough for realizing industrial and marketization application.

The invention discloses a high-vanadium wear-resistant steel plate and a manufacturing method thereof, and belongs to the field of ferrous metallurgy. The thickness of the steel plate is less than or equal to 40mm, the steel plate comprises the following chemical components in percentage by weight: 0.20-0.30% of C, 0.20-0.60% of V and the like, and the carbon equivalent CEV is less than or equal to 0.70%; the microscopic structure is tempered martensite, and VC particles with the particle size of 50-200 nm are uniformly dispersed and distributed. According to the performance indexes, the yield strength is larger than or equal to 1200 MPa, the tensile strength is larger than or equal to 1350 MPa, the impact energy at the temperature of-40 DEG C is larger than or equal to 15 J, the surface hardness is 420-480 HBW, and the wear resistance is improved by 30% or above compared with existing wear-resistant steel with the same hardness. The manufacturing method comprises the steps of molten iron pretreatment, converter smelting, LF refining, RH vacuum degassing, Ca treatment, continuous casting, heating, temperature control rolling and double-stage heat treatment. The wear resistance is improved through VC particle dispersion strengthening, high strength, high toughness and welding performance are considered, the process is economical and environmentally friendly, and the high-strength wear-resistant aluminum alloy is suitable for easily-worn equipment parts in the fields of coal, mines and the like.

The application discloses a welding process parameter optimization method based on finite element simulation and a response surface method, and is used for welding residual stress and deformation control problems of large and complex structures in a nuclear fusion device. The method is characterized in that: a thermal-mechanical coupling finite element model of a welding process is constructed, mechanical responses under different process parameter combinations are obtained, an approximate function relationship between process parameters and welding responses is established by using the response surface method, multi-objective optimization is realized at a mathematical model level, and an optimal process parameter combination meeting welding performance requirements is obtained. The application establishes a mathematical mapping model between process parameters and key performance indexes such as welding residual stress and deformation by using the response surface method, and then performs multi-objective optimization on the response surface, so that a large amount of repeated simulation and artificial judgment in a traditional trial-and-error method are avoided, and the optimization efficiency and systematization are significantly improved.

The utility model relates to the field of vacuum induction melting furnaces, and discloses a vacuum induction melting furnace for stainless steel welding rod production, which comprises a furnace body, one side of the furnace body is rotatably connected with a furnace cover, one side of the furnace cover is rotatably connected with a lock catch, the inside of the furnace body is fixedly connected with an air pump, and one end of the air pump is provided with an air filtering assembly. An adjusting assembly is arranged in the furnace body, a melting assembly is arranged in the furnace body, a gas filtering assembly comprises an annular water pipe and a gas filtering tower, a spray head is fixedly connected to the interior of the annular water pipe, a drainage valve is fixedly connected to one side of the outer wall of the gas filtering tower, and a water inlet is fixedly connected to the interior of the annular water pipe. According to the utility model, through the synergistic effect of the annular water pipe and the gas filtering tower and the combination of an atomized water spraying system of the spray head, harmful gas and tiny impurities generated in the smelting process can be actively adsorbed and cooled, the welding performance of stainless steel welding rods is improved, and the crack resistance, high temperature resistance and corrosion resistance of the stainless steel welding rods are enhanced.

This invention belongs to the field of welding-related technology, specifically providing a magnetically controlled assisted welding dynamic alignment method and system. The system includes: a magnetic control device, an infrared temperature measuring device, a motor, and a control system. The magnetic control device is mounted on the welding torch, and the infrared temperature measuring device is mounted on the magnetic control device. The infrared temperature measuring device includes a reciprocating infrared temperature sensor for real-time acquisition of the temperature on both sides of the molten pool. The motor drives the magnetic control device to rotate and adjust its position along the welding torch axis. The control system processes the temperature data in real time, calculates the deflection angle, and outputs a motor control signal. This invention can ensure the relative position of the magnetic field and the welding trajectory during complex path welding, thereby guaranteeing welding performance and quality under the assistance of the magnetic control device.

This invention discloses a hot-rolled steel sheet for vacuum train tubes that exhibits excellent yield strength, weldability, low-temperature toughness of the welded portion, vibration damping ratio, and is free from hot cracking. The hot-rolled steel sheet according to this invention is characterized in that its alloy composition, by weight percent, comprises: C: less than 0.06% (more than 0%), Si: 0.5-1.5%, Mn: 1.2-2.2%, Cu: 0.5-1.5%, Ni: more than 0.25%, Ti+Nb+V: less than 0.02% (inclusive of 0%), the balance being Fe and unavoidable impurities.

This invention belongs to the technical field of steel for engineering structures, and particularly relates to a method for producing ultra-thick pile pipe steel with excellent low-temperature toughness based on hot rolling. The chemical composition of the steel, by weight percentage, includes: C: 0.05%-0.07%, Si≤0.08%, Mn: 0.7%-0.9%, P≤0.018%, S≤0.008%, Ti: 0.03%-0.04%, Als: 0.02%-0.050%, Nb: 0.008%~0.018%, N≤0.0050%, with the balance being Fe and unavoidable impurities. The hot-rolled coils of ultra-thick pile pipe steel with good low-temperature toughness are produced by hot rolling, replacing medium-thick plates with ultra-thick specifications, improving production efficiency and reducing costs. The mechanical properties, low-temperature toughness, and weldability of the steel plate meet the user's requirements.

Nickel-based alloy welding wire for welding dissimilar iron / nickel rotors, its preparation method, and its application. This invention belongs to the technical field of nickel-based alloy materials. The purpose of this invention is to solve the technical problem that existing weldable nickel-based alloy welding materials cannot meet the practical engineering needs of welding rotors made of dissimilar nickel-based and iron-based materials. This invention achieves this by comprehensively controlling the composition of the welding wire, especially by precisely controlling the content of Al, Ti, Nb, and Ta, to ensure that the deposited metal maintains high comprehensive mechanical properties at room temperature and high temperature under conditions of no solution aging, and also ensures good welding performance. It is applied to the welding of dissimilar nickel-based and iron-based alloy rotors at 700℃.

This invention relates to a high-strength and high-toughness forged ring with a large wall thickness of 460MPa or above, its preparation method, and its application. It belongs to the field of forging technology and solves the problems of poor impact toughness in the core of forged rings with a wall thickness ≥100mm in the prior art, and the difficulty in achieving both high strength and excellent welding performance. The method includes the following steps: S1: Billet preparation, selecting a billet with the following chemical composition by weight percentage: C 0.08-0.12%, Si 0.10-0.20%, Mn 1.00-1.20%, Ni 1.0-1.4%, Mo 0.2-0.4%, V 0.02-0.05%, S<0.001%, P<0.006%, with the remainder being Fe and unavoidable impurities; S2: Forging the forged ring, forging the billet into a forged ring of the required size, wherein the wall thickness of the forged ring is ≥100mm; S3: Post-forging pretreatment; S4: Heat treatment, sequentially quenching, two-phase quenching, and tempering of the pretreated forged ring; S5: Finishing. This method enables the preparation of high-strength, high-toughness, thick-walled forged rings for shipbuilding, offshore platforms, or engineering machinery applications.

According to the high-silicon solid solution nodular cast iron material with the high welding performance, the content of Si is controlled to be 3.7-4.2%, the content of Cu is controlled to be 0.15-0.45%, the high-temperature brittleness of the material is effectively reduced, and the high-temperature tensile strength of the material is improved. When the high-welding-performance high-silicon solid solution nodular cast iron material is used for welding, cracks do not appear in a welding seam heat affected zone on the cast iron side after welding, the welding rejection rate can be reduced, the part welding quality is improved, and the machining cost is reduced.

This invention discloses a ship plate steel with high plasticity, excellent impact toughness, and excellent weldability, and its production method. The composition of the ship plate steel includes C, Si, Mn, Als, P, S, Re, and the balance Fe and impurities. The preparation method includes: heating the billet at a temperature of 1150–1250℃, a heating rate of 8–12 min / cm, and a furnace exit temperature in the range of 1170±30℃; rolling: the first-stage rolling temperature is ≥1050℃, the intermediate billet thickness is 3 times the thickness H of the finished steel plate, and the second-stage rolling temperature is ≤960℃. The final rolling temperature is 830±30℃; the red-hot temperature after rolling is determined according to the thickness H of the finished steel plate. When H≤16mm, the red-hot temperature after rolling is 620±40℃; when 16<H≤25mm, the red-hot temperature after rolling is 640±30℃. The maximum thickness of the finished steel plate obtained by this invention is 25mm, the yield strength ReH≥320MPa, the tensile strength Rm≥420MPa, the elongation A≥30%, the longitudinal impact energy KV2≥200J at 0℃, and the steel plate microstructure is ferrite + pearlite. It is an economical high-plasticity ship plate steel.

The invention belongs to the technical field of metal material surface treatment, and discloses a production process of a weldable electroplated chromium plate. According to the process, cluster-shaped peak morphology is transferred on the surface of a cold-rolled steel coil through a laser texturing roller, and staged double-layer chromium electroplating is combined, specifically, a discontinuous chromium layer is formed on the top of a micro convex peak through first-time high-current pulse electroplating, and local iron leakage points are reserved; the second low current direct current plating covers an ultrathin continuous chromium film to maintain macro passivation. According to the invention, a composite functional structure with both macroscopic passivation integrity and microcosmic conductive selectivity is constructed on the surface of chromium-plated iron by accurately controlling the microstructure of the surface of a base material and double-layer chromium plating process parameters, so that the technical bottleneck of the chromium-plated plate in resistance welding application is effectively solved, collaborative optimization of weldability and corrosion resistance is realized, and the application range of the chromium-plated plate in resistance welding is widened. And a reliable technical path is provided for comprehensive replacement of chromium-plated iron in the field of metal packaging.

The application discloses an extrusion process of a battery tray end plate aluminum profile. It belongs to the field of aluminum profile forming technology. The application optimizes the material ratio of aluminum alloy cast bar raw materials, controls the Mg / Si ratio to be 1.09, and adopts a porous split-flow extrusion die with a bridge position structure. The extrusion process adopts segmented speed control, the starting pressure speed is less than or equal to 1.0 mm / s, the speed is increased to 1.6-2.2 mm / s after the material is discharged more than 1 meter, and nitrogen protection and dynamic temperature control technology are used. After the profile is extruded, it is cooled by water quenching, and then T6 double-stage aging treatment is carried out, so that the battery tray end plate aluminum profile is obtained, the breakthrough of high strength, high precision and high yield is realized, the problems of thin-wall forming difficulty and large welding performance fluctuation in the prior art are solved, and key manufacturing technology support is provided for new energy automobile battery trays.

The present application relates to a kind of 960MPa grade bridge structural steel with low internal stress fracture toughness and excellent and its preparation method, the steel contains the following weight percentage content chemical composition: C:0.055~0.105%, Si:0.05~0.15%, Mn:1.65~1.75%, P≤0.010%, S≤0.003%, Ni:0.80~1.80%, Cr:0.45~0.75%, Mo:0.20~0.30%, Nb:0.060~0.080%, Ti:0.035~0.050%, Als:0.015~0.045%, the balance is Fe and inevitable impurity element;Wherein chemical composition needs to satisfy:0.188≤Pcm≤0.275, 0.513≤CEV≤0.717;Production step includes: smelting, slab heating, rolling, ACC controlled cooling, intercritical quenching, stress relief annealing heat treatment;The finished steel plate prepared by the present application has yield strength ≥985MPa, tensile strength ≥1100MPa, excellent low temperature toughness, longitudinal KV2 at-40 ℃ is ≥120J, fracture toughness, the fracture toughness of material under room temperature condition is ≥0.26mm, and the absolute value of steel plate residual internal stress is ≤18MPa;The 960MPa grade high-performance bridge steel plate prepared by the method of the present application has high strength and toughness, low internal stress, excellent welding performance, meets the application requirements of bridge, high-rise building and other steel structures.

The invention relates to the technical field of steel and iron smelting, and particularly discloses a preparation method of an SA537CL1 steel plate easy to weld and excellent in multiple die welding performance, the steel plate is smelted in a converter mode, then the steel plate is fed into an LF refining furnace to be refined and subjected to vacuum treatment, and then a continuous casting blank is cast through continuous casting operation; the continuous casting billet comprises the following chemical components in percentage by mass: 0.13%-0.17% of C, 0.15%-0.50% of Si, 1.35%-1.60% of Mn, 0.025%-0.050% of Nb, 0.030%-0.060% of V, less than or equal to 0.030% of Ti, less than or equal to 0.015% of P, less than or equal to 0.005% of S and the balance of Fe and other inevitable impurity elements. The steel plate sample is subjected to four times of simulated welding or simulated thermal forming and four times of simulated welding; according to the invention, basically stable control of product performance after the steel plate sample is subjected to simulated thermal forming and multiple simulated stress relief heat treatment processes is realized.

The invention discloses a Cr-volatilization-resistant Mo-doped high-temperature alloy for a BOP assembly and a preparation method of the Cr-volatilization-resistant Mo-doped high-temperature alloy, and relates to the technical field of alloy high-temperature surface protection. The invention aims to solve the problems of Cr volatilization in a high-temperature environment and protection failure of a traditional coating. The alloy comprises the following components in percentage by weight: 1-3% of Mo, 25% of Cr, 20% of Ni and the like, and the balance of Fe. By accurately controlling the composition and the process, Mo-rich Laves phases which are uniformly distributed are formed on an oxide / metal interface, so that the ion diffusion rate is effectively reduced, and the Cr volatilization resistance is improved. The alloy has good processing and welding performance, and is suitable for preparation of solid oxide fuel cell BOP key components in a high-temperature and high-humidity environment.