132 results about "Atmospheric corrosion" patented technology

The invention provides an aluminum alloy atmospheric corrosion prediction method and system based on machine learning, and relates to the technical field of aluminum alloy corrosion prediction. Comprising the following steps: collecting aluminum alloy atmospheric corrosion data including environmental meteorological data, aluminum alloy component characteristics and aluminum alloy corrosion rate to obtain an aluminum alloy atmospheric corrosion initial data set; performing screening and dimension reduction on the data in the initial data set to obtain an aluminum alloy atmospheric corrosion prediction data set; based on the aluminum alloy atmospheric corrosion prediction data set, the built CNN-SVM model is trained; and acquiring environment data of the to-be-tested aluminum alloy, and predicting the atmospheric corrosion rate of the to-be-tested aluminum alloy based on the trained CNN-SVM model. According to the method, accurate feature screening and short-time-consumption model training are carried out by utilizing limited experimental data, the atmospheric corrosion of the aluminum alloy is predicted at high precision, the cost input of a traditional experiment is reduced, the time cost is saved, and the prediction precision and efficiency are improved.

The invention belongs to the technical field of manufacturing of low-alloy high-strength steel, and particularly relates to atmospheric corrosion resistant HC260LA low-alloy high-strength steel and a production method of the atmospheric corrosion resistant HC260LA low-alloy high-strength steel. 0.15% to 0.30% of Si; 0.40% to 0.60% of Mn; 0.06% to 0.10% of P; less than or equal to 0.015% of S; 0.02% to 0.08% of Al; 0.10% to 0.20% of Cu; 0 to 0.15% of Ti; 0 to 0.09 percent of Nb; 0.001% to 0.006% of N; and the balance of Fe and inevitable impurities. According to the method, the blocking effect of segregation of P-Cu elements on the grain boundary on a corrosion path is utilized, low-temperature rolling is combined, a three-dimensional corrosion-resistant system of fine grain strengthening, substructure strengthening and rust layer protection is constructed, and the weather resistance, the corrosion resistance and the mechanical property are jointly improved.

The invention discloses wear-corrosion-resistant high-strength steel for a power transmission tower and a preparation method thereof, and belongs to the technical field of metal materials. The wear-corrosion-resistant high-strength steel for the power transmission tower provided by the invention has good corrosion resistance and wear resistance, has excellent wear resistance in a soil environment of sulfate ions with the concentration of 300 mg / kg-50000 mg / kg and chloride ions with the concentration of 500 mg / kg-10000 mg / kg, and meets various environmental performance requirements of an acid soil environment, an atmospheric corrosion environment and the like. In an acid soil environment, the corrosion resistance is more than 8 times that of plain carbon steel, and the relative corrosion rate is lower than 10%; compared with Q355B, the corrosion rate of atmospheric corrosion resistance is lower than 40%, and the abrasive wear rate is 26.5%-28.0%; and through reasonable matching of corrosion-resistant elements, the requirements of corrosion resistance in various environments are met. The yield strength is 775 MPa-805 MPa, the tensile strength is 952 MPa-985 MPa, the percentage elongation after fracture A50 is larger than or equal to 28%, the low-temperature impact toughness at the temperature of-60 DEG C is larger than or equal to 260 J, meanwhile, the forming performance is excellent, and the 180-degree cold bending requirements that d is equal to 1.0 a are met.

The invention belongs to the technical field of metal material corrosion informatization, and particularly relates to an enhanced neural network prediction model based on SHAP and a weather-resistant steel atmospheric corrosion rate prediction method. Wherein the sample data of the weathering resistant steel to be tested comprises determined key features in the enhanced neural network prediction model based on SHAP; and inputting the preprocessed data into the enhanced neural network prediction model based on the SHAP to obtain the corrosion rate of the weathering resistant steel to be detected. The method not only effectively solves the problems of insufficient prediction precision, high cost, difficult evaluation of long-term performance and the like in a traditional method, but also provides reliable data support and decision basis for the weathering resistant steel material in the field of practical engineering application, and can be suitable for rapid and reliable evaluation of the long-term service performance of the weathering resistant steel.

The application provides a low yield ratio heavy industrial atmospheric corrosion resistant bridge steel plate and a manufacturing method thereof. The steel plate comprises the following components in percentage by weight: C: 0.07% to 0.10%, Si: 0.10% to 0.30%, Mn: 0.60% to 1.00%, P: less than or equal to 0.010%, S: less than or equal to 0.003%, Nb: 0.02% to 0.04%, Ni: 0.15% to 0.35%, Cu: 0.10% to 0.40%, Mo: 0.20% to 0.50%, Cr: 1.50% to 2.40%, Ti: 0.01% to 0.030%, Sb: 0.03 to 0.10%, Al: 0.015% to 0.040%, and the balance of iron and inevitable impurities. The production method of the steel plate comprises the following steps: molten iron pretreatment, smelting, continuous casting, slab heating, rolling and straightening. The steel plate has the following properties: yield strength is greater than or equal to 345 MPa, tensile strength is greater than or equal to 510 MPa, elongation after fracture is greater than or equal to 30%, yield ratio is less than or equal to 0.75, thickness direction section shrinkage is greater than or equal to 70%, and low temperature impact energy at-40 DEG C is greater than or equal to 300 J. The annual corrosion rate of the steel plate in a simulated heavy industrial atmospheric environment is less than or equal to 0.05 mm / a, and the corrosion performance is 4 to 8 times higher than that of common Q345qE.

The invention discloses a method and system for predicting the atmospheric corrosion life of an aluminum alloy based on a corrosion image, and the method comprises the steps: carrying out the image processing and feature extraction based on an obtained aluminum alloy corrosion image, and obtaining the fractal dimension of the current time; calculating based on the fractal dimension of the current time in combination with a pre-constructed aluminum alloy corrosion life prediction model to obtain the residual corrosion life of the aluminum alloy and the maximum corrosion pit depth of the current time; wherein the aluminum alloy corrosion life prediction model is constructed and obtained by determining a function relation between the maximum corrosion pit depth and the corrosion time on the basis that fractal dimensions serve as intermediary variables of the corrosion time and the maximum corrosion pit depth; the fractal dimension is used as an intermediary variable, so that the problem that the traditional corrosion pit depth is difficult to directly associate with the exposure time is solved; the service life prediction model can predict the corrosion service life of the aluminum alloy more accurately; according to the box counting method, the corrosion morphology complexity can be quantified, and the traditional pitting rate parameter sensitivity is improved by 40%.

The present application provides a kind of atmospheric environmental corrosion loss prediction method considering the change of metal active area, steps are as follows: step one: determining indoor metal material accelerated corrosion curve;Step two: establish active area and corrosion loss relationship model;Step three: determine corrosion current under different environmental factors;Step four: build the connection function of corrosion current and environmental factors;Step five: use Runge-Kutta algorithm to predict field environment metal corrosion.The present application establishes the correlation model of environmental factors, metal material surface active area and time variable as a whole to describe the quantitative model method of metal material atmospheric corrosion rate;Compared with traditional modeling method, the prediction of metal material atmospheric corrosion is more accurate and reasonable through active area function and connection function;The present application selects corrosion weight loss as basic physical parameter, test method is simple, easy to calculate, and data processing algorithm complexity is lower;Method is scientific and reasonable, and process is good, with wide popularization and application value.

Provided is a method for evaluating the delayed fracture characteristics of a metal material, the method being capable of accurately evaluating delayed fracture characteristics caused by hydrogen entering the inside of a metal material due to atmospheric corrosion in which a chloride is a dominant factor of corrosion.　This method for evaluating the delayed fracture characteristics of a metal material carries out, at least one time, a process involving: a chloride adhesion step (A) in which droplets of a chloride-containing aqueous solution are adhered to an evaluation surface of a metal material so as to achieve a predetermined adhesion amount of a chloride; and a corrosion step (B) in which a cycle having a predetermined drying step (b1), a wetting step (b2), a transition step (b3), and a transition step (b4) is regarded as one cycle, and the cycle is performed at least one time, wherein, regarding the distribution of the droplets on the evaluation surface of the metal material in at least the first chloride adhesion step (A), the average contact area of the droplets is at least 0.1 mm2 and less than 3.0 mm2, the area ratio of the total contact area of the droplets to the area of the evaluation surface is 40-80%, and the standard deviation of the contact area of the droplets is at most 3.0 mm2.

A Ti microalloyed Q355NH steel plate and its preparation method are disclosed, comprising the following components: C≤0.12%; Si: 0.20~0.35%; Mn: 1.0~1.2%; Ni≤0.30%; Cr: 0.40~0.60%; Cu: 0.25~0.35%; Ti≤0.03%; P≤0.02%; S≤0.01%. The beneficial effects of this invention are: by employing Ti microalloying technology, a trace amount of Ti is added to Q355NH steel, which combines with C and N to form fine titanium carbonitride particles, effectively refining the grains and producing a significant precipitation strengthening effect. Thus, while reducing the amount of microalloying elements such as Nb added, the strength, toughness, and weldability of the steel plate can still be guaranteed or even improved, reducing production costs. Simultaneously, these fine titanium carbonitride particles can pin grain boundaries, inhibiting grain coarsening in the weld heat-affected zone, further improving the weldability of the steel plate. Furthermore, the combination of this Ti microalloying technology with controlled rolling and controlled cooling processes can effectively refine and homogenize the microstructure of steel plates, significantly improving their comprehensive mechanical properties and atmospheric corrosion resistance.

The invention discloses a rapid evaluation method for atmospheric corrosion resistance of weathering resistant steel and application thereof, the evaluation method comprises the following steps: S1, calculating an atmospheric corrosion resistance index I of the weathering resistant steel based on chemical components of the weathering resistant steel according to the following formula: I = 26.01 Cu + 3.88 Ni + 1.20 Cr + 1.49 Si + 17.28 P-7. 29 Cu * Ni-9. 10 Ni * P-33.39 (Cu) 2, and if I is greater than or equal to 6.2, entering subsequent test evaluation; s2, performing a neutral salt spray test on the sample meeting the step S1 for 72 hours, then calculating the salt spray corrosion rate, and if the salt spray corrosion rate is less than or equal to 1.16 g / (m < 2 >. H), judging that the sample is qualified; s3, if the weathering resistant steel is used in the high-humidity atmospheric environment, a periodic infiltration test needs to be carried out, and if the periodic infiltration corrosion rate is smaller than or equal to 1.958 g / (m < 2 >. H), it is judged that the weathering resistant steel is applicable; and S4, if the weathering resistant steel is used for a typical atmospheric environment with high temperature, high humidity and serious corrosion, an atmospheric exposure test needs to be performed for 12 months, and if the stable corrosion rate is smaller than or equal to 0.031 g / (m < 2 >. H), it is judged that the weathering resistant steel is applicable. The weather-resistant steel corrosion performance evaluation system is established by analyzing the atmospheric corrosion resistance index of the weather-resistant steel and the corrosion results of different materials in different typical environments.

The embodiment of the application discloses a kind of bridge cable alloy coating steel wire time-varying corrosion quantity quantization model construction methods, it is related to bridge cable steel wire corrosion modeling and prediction field.The method comprises: obtaining the bridge cable alloy coating steel wire to be modeled;According to the corrosion rate coefficient of coating material, the corrosion rate formula of zinc is corrected, and the corrosion rate formula of coating material is obtained, wherein the corrosion rate formula of zinc is obtained by zinc atmospheric corrosion test, and the atmospheric corrosion test uses plate body by default, and the corrosion rate coefficient is used to represent the corrosion rate ratio of coating material plate and zinc plate;According to the corrosion rate formula of coating material, the model that corrosion depth of alloy coating steel plate changes with time is constructed;According to the corrosion depth relationship of plate body and cylinder with same material under same time, the model is converted into the model that corrosion depth of alloy coating steel wire changes with time.This embodiment is suitable for a variety of plated steel wires, and the application range is wide.

The present invention discloses a method for mapping atmospheric corrosion levels that takes into account the impact of microenvironments. The method combines an air quality model to determine the impact range of each corrosive medium emission source within a region, selects locations unaffected by the corrosive medium emission sources as background points for sub-regional corrosion assessment, and uses a method of distributing points at different distances to determine the impact of the microenvironment on the surrounding environment. During operation, the method forms a final atmospheric corrosion level map by superimposing the corrosion level changes caused by corrosive medium emission sources on the atmospheric base corrosion level map. This method enables more accurate atmospheric corrosion level mapping, thereby guiding differentiated material selection and maintenance.

Provided is a high-strength steel sheet having excellent member strength, stretch flangeability, bendability, and delayed fracture resistance under atmospheric corrosion and in a coated state. The steel sheet has a prescribed component composition, microstructure and the like, the average value [tau q] of the plastic deformation initiation stress [tau q] measured by nanoindentation at a position 1 / 4 of the sheet thickness of the steel sheet is 2.50-4.10 GPa, the standard deviation [sigma q] of the tau q is 0.30 GPa or less, and the average value [tau q] of the plastic deformation initiation stress [tau q] is 0.30 GPa or less. When [tau s] is the average value of the plastic deformation start stress [tau] s measured by the nanoindentation method at a position 10 [mu] m from the surface of the steel sheet, the ratio of measurement points less than 0.85 * [tau s] is 25.0% or less.

The present invention relates to the technical field of atmospheric corrosion-resistant steels, and disclosed are a coating-free super weathering steel and a manufacturing method therefor. The coating-free super weathering steel comprises the following chemical components in percentage by mass: C: 0.01-0.07%; Si: 0.20-0.80%; Mn: 0.3-0.9%; Cu: 0.15-0.25%; Cr: 1.25-1.8%; P: 0.06-0.10%; S≤0.02%; niobium (Nb): 0-0.10%; titanium (Ti): 0-0.10%; Nb+Ti: 0.05-0.12%; Cu / P: 2-4; Cr / Cu: 5-10; and the balance of Fe and inevitable impurities. The present invention improves the stability of rust layers in weathering steels by means of the synergistic effect of elements such as Cu, Cr and P, and achieves high strength and high toughness by means of Nb and Ti microalloying in conjunction with a controlled rolling and controlled cooling process, thereby achieving the effects of improving the economy and corrosion resistance of super weathering steels and realizing coating-free use.

This invention relates to the field of metallurgical technology, specifically to an ultra-low yield strength ratio, high-phosphorus, atmospheric corrosion-resistant steel and its preparation method. The preparation method includes: placing a cut billet into a slow-cooling pit, with the initial slow-cooling temperature ≥500℃ and the final slow-cooling temperature not lower than 300℃; heating the slow-cooled billet, controlling the billet's exit temperature from the furnace to 1140~1170℃, and the furnace time coefficient to be 10~11 min / cm; employing a two-stage rolling process, with the billet undergoing the first stage of rolling after descaling, and the surface temperature of the rolled piece at the start of the second stage of rolling being T2=(T+1600 / H-1.8H)℃, and the rolled steel plate not being water-cooled; and then placing the rolled steel plate between steel plates at 500~600℃ for at least 48 hours to achieve stacking cooling. This invention utilizes a fine, uniform microstructure and phosphorus and chromium compounds to improve the material's corrosion resistance, meeting the requirements for corrosion resistance and high toughness of steel used in building and engineering structures in coastal atmospheric environments.

The invention relates to the technical field of single crystal furnaces, in particular to an anti-corrosion straight pull type single crystal furnace auxiliary furnace which comprises an auxiliary furnace main body, a driving mechanism and a plurality of lining plates arranged in the circumferential direction of the inner side of the auxiliary furnace main body. A channel used for drawing and forming a monocrystalline silicon column is defined by the inner lining plates, and the inner lining plates are in sliding fit with the rotating wheel disc and the bearing ring correspondingly and synchronously deflect and move in the radial direction under the action of the driving mechanism, so that the aperture of an inner hole of the auxiliary furnace is continuously adjustable. An interlayer cavity is formed between the inner lining plate and the auxiliary furnace main body, inert gas is introduced into the interlayer cavity, and a directional air curtain is formed through an air guide channel in the inner lining plate and an air distribution strip, so that corrosive gas is isolated and protected. And the inner lining plate adopts a detachable structure, so that the auxiliary furnace main body can be effectively isolated in a high-temperature corrosion environment and is convenient to replace. The auxiliary furnace has the advantages of being large in aperture adjusting range, high in atmosphere corrosion resistance, convenient to maintain and suitable for drawing of monocrystalline silicon columns of multiple specifications.

The application provides a low yield ratio and 370MPa-grade marine atmosphere corrosion resistant heavy steel plate without coating and a manufacturing method thereof. The steel plate is composed of the following components in percentage by weight: C: 0.04% to 0.06%, Si: 0.10% to 0.30%, Mn: 0.30% to 0.50%, P: less than or equal to 0.012%, S: less than or equal to 0.005%, Ni: 2.7% to 3.5%, Cu: 0.35% to 0.85%, Mo: 0.05% to 0.15%, Nb: 0.005% to 0.015%, Ti: 0.006% to 0.030%, Al: 0.015% to 0.040%, B: 0.0008 to 0.0016%, and the balance of iron and inevitable impurities. The components satisfy 22 <= 15[Mo]+6[Ni]+5[Cu] <= 26, the Pcm value (%) is less than or equal to 0.19%, the production method of the steel plate comprises smelting, slab continuous casting, slab heating, controlled rolling, controlled cooling and heat treatment. The yield strength of the steel plate is greater than or equal to 370MPa, the tensile strength is greater than or equal to 510MPa, the elongation after fracture is greater than or equal to 20%, the yield ratio is less than or equal to 0.77, the KV2 impact energy at-40 DEG C is greater than or equal to 200J, the corrosion rate of the steel plate in a marine atmosphere environment in a one-year period is 0.024mm / a to 0.030mm / a, and the thickness of the steel plate is 100mm to 130mm.

The invention relates to a steel atmospheric corrosion assessment method based on an attention-enhanced convolutional neural network, and the method comprises the steps: collecting the atmospheric corrosion data of carbon steel, low alloy steel and weathering steel in each region, and constructing a multi-element corrosion database; dividing a training set and a test set, and carrying out normalization processing on the data set; introducing a double attention mechanism into the convolutional neural network, and constructing an attention-enhanced convolutional neural network model; training and hyper-parameter optimization are carried out on the constructed attention-enhanced convolutional neural network model by using the training set sample; and evaluating the generalization ability of the trained attention-enhanced convolutional neural network model in an unknown data set by using a test set sample, wherein the final model is used for predicting the corrosion rate of the steel. By constructing the attention-enhanced convolutional neural network model, the problems that a traditional machine learning algorithm and an empirical model are low in prediction precision and poor in interpretability are solved, and a new and excellent solution is provided for steel corrosion evaluation.

The invention provides a storage tank external corrosion maintenance method and device, and the method comprises the steps: determining the atmospheric corrosion grade of a storage tank based on the content of key corrosives in the atmosphere around the storage tank; based on the corrosion area, the corrosion color and the corrosion position of the storage tank, the external corrosion degree grade of the storage tank is determined; based on the atmospheric corrosivity grade and the external corrosion degree grade, the external corrosion grade of the storage tank is determined; and performing external corrosion maintenance on the storage tank based on the external corrosion grade of the storage tank. Based on the atmospheric corrosivity grade and the external corrosion degree grade, the external corrosion grade used for representing the external corrosion maintenance sequence of the storage tank is determined, manual judgment errors are reduced, and the problem that the outer wall of the storage tank is excessively maintained or not maintained in time is solved.

The utility model relates to the field of bolt protection, and provides a fastener protection device and a fastening structure which are applied to a nut structure exposed outside, a nut is used for being tightly attached to an installation plane, the fastener protection device comprises a cover body, and the cover body is connected with the installation plane in a sealed mode. And the cover body covers the outer side of the nut to form sealing. According to the scheme, the cover is arranged on the outer side of the nut to isolate the inside and the outside, and therefore physical corrosion prevention is achieved. The cover body forms a sealed or semi-sealed space on the outer side of the nut, so that external corrosive media such as air, moisture and chloride ions are isolated, and the corrosion of the corrosive media to the contact part of the nut and the bolt is reduced. Especially in a high-salinity and high-humidity environment, the physical barrier can effectively slow down the occurrence speed of electrochemical corrosion and atmospheric corrosion, and the service life of the fastener is remarkably prolonged.

The invention relates to the technical field of hot-rolled checkered plates, in particular to a high-strength wear-resistant atmosphere-corrosion-resistant hot-rolled checkered plate for a railway freight car and a manufacturing method of the hot-rolled checkered plate. The hot-rolled checkered plate comprises the following chemical components in percentage by weight: 0.06%-0.11% of C, 0.42%-0.55% of Si, 1.11%-1.23% of Mn, 0.007%-0.012% of P, less than or equal to 0.008% of S, 0.33%-0.42% of Cr, 0.1%-0.3% of Ni, 0.35%-0.46% of Cu, 0.12%-0.25% of Mo and the balance of Fe and inevitable impurities. The room-temperature structure of the checkered plate is ferrite (the area ratio is 80%) and pearlite (the area ratio is 20%), the yield strength is 520-600 MPa, the tensile strength is 590-630 MPa, the ductility is 21.5%-26%, the hardness is 205-221 HBW, the wear rate relative to Q345B is 30%-45%, the height of the checkered plate reaches the standard, and the plate shape is excellent.

The invention discloses marine atmosphere corrosion-resistant high-toughness steel and a preparation method thereof, and relates to the technical field of steel production, and the marine atmosphere corrosion-resistant high-toughness steel comprises the following chemical components in percentage by mass: 0.025-0.035% of C, 1.29-1.51% of Si, less than or equal to 0.010% of P, less than or equal to 0.0010% of S, 1.6-2.9% of Cr, 0.41-0.65% of Cu, 0.15-0.45% of Al and 0.95-2.25% of Ti. And the balance of Fe and inevitable impurities. The high-toughness steel resistant to marine atmosphere corrosion has good seawater corrosion resistance and marine organism corrosion resistance, the safety of sailors, ships, transported goods and marine ecology is guaranteed, and the service life of the whole steel structure engineering is prolonged.

The present application relates to a device and method for atmospheric corrosion electrochemical measurement of a metal conductor under simulated self-generated electric field, the measurement device comprising: a self-generated electric field system comprising a grounded tubular metal negative electrode and a constant voltage power supply connected to the metal conductor and the tubular metal negative electrode respectively; a support configured to fixedly support the metal conductor as a test sample and the tubular metal negative electrode, the metal conductor being coated with an insulating film except for a working electrode exposed area; a thin liquid film system comprising a thin liquid film medium wound around the area of the metal conductor with the insulating film and the working electrode exposed area, the thin liquid film medium being used to provide a target test solution environment for the metal conductor; a three-electrode system comprising a counter electrode and a reference electrode, the metal conductor exposed area serving as a working electrode. The present application can perform atmospheric corrosion thin liquid film electrochemical measurement of a metal conductor under different atmospheric environment level parameters under various different self-generated electric field service conditions.

This invention discloses an ultra-high strength and high toughness marine engineering steel and its production method. The chemical composition (wt%) is: C: 0.02–0.07, Si: 0.10–0.25, Mn: 1.75–2.50, P: 0.022–0.026, S: ≤0.008, Nb: 0.06–0.08, V: 0.08–0.085, Ti: 0.045–0.05. 5. Mo: 0.20~0.35, Cr: 1.60~1.80, Ni: 1.60~1.80, Co: 0.40~0.52, Als: 0.035~0.045, N: 0.015~0.016, Cu: 0.52~0.55, Sn: 0.03~0.05, Sb: 0.03~0.05, B: 0.0008~0.001. The process includes smelting, continuous casting, rapid cooling, billet heating, rolling, and heat treatment. The maximum thickness of the steel is 100mm, Z-axis properties ≥35%, Rp0.2 is 950~985MPa, A ≥20%, fatigue life at peak stress of 470MPa >2 million cycles, impact energy at -60℃ ≥150J, and marine atmospheric corrosion resistance rate <0.09mm / a. This invention improves the strength of steel while solving the problems of poor low-temperature impact toughness, insufficient corrosion resistance and fatigue resistance of steel plates.

The application discloses a kind of refinery anticorrosive coating coating strategy recommendation method and system, belong to anticorrosive coating technical field.The system includes anticorrosive coating database, anticorrosive coating classification module, anticorrosive coating preliminary selection module, anticorrosive coating optimization module, anticorrosive coating final selection module, display input module.The recommendation method and system provided by the application fully consider the state of refinery device coating coating, the substrate of refinery device, the surface layer material of refinery device, the operating temperature of medium in refinery device, the atmospheric corrosion grade where refinery device is located and other factors, and the selection of different coating types and thickness is set specifically, which effectively ensures the rationality and scientificity of coating type and thickness selection, reduces production cost while ensuring coating quality, and improves the economic benefit of enterprise.

The application relates to an anti-industrial atmosphere corrosion and anti-seismic steel bar and a preparation method thereof. The anti-industrial atmosphere corrosion and anti-seismic steel bar comprises the following components in percentage by weight: C: 0.17wt%-0.21wt%, Mn: 0.95wt%-1.25wt%, Si: 0.35wt%-0.65wt%, Cr: 0.20wt%-0.40wt%, V: 0.025wt%-0.035wt%, Cu: 0.30wt%-0.50wt%, P: 0.08wt%-0.10wt%, S<=0.010wt%, and the balance is Fe and inevitable impurities.

The invention discloses a welding process of a marine atmosphere corrosion resistant steel plate, which comprises the following steps of: aiming at plate butt joint, adopting a groove form with a V-shaped groove, a truncated edge size of 2mm and a groove angle of 30 degrees, adopting flux-cored wire CO2 gas shielded semi-automatic welding to carry out backing welding or submerged-arc welding to carry out filling and cosmetic welding, and carrying out back gouging treatment before reverse welding; for T-shaped penetration fillet welds and T-shaped partial penetration fillet welds, a groove form with a K-shaped groove, a truncated edge size of 2mm and a groove angle of 45 degrees is adopted, and flux-cored wire CO2 gas shield semi-automatic welding is adopted; for T-shaped fillet weld ship position welding, grooves are not formed, and submerged automatic arc welding is adopted; aiming at T-shaped fillet weld flat position welding, no groove is formed, and flux-cored wire CO2 gas shielded semi-automatic welding is adopted. According to the process, the requirement that the mechanical property of a welding joint of the marine atmospheric corrosion resistant steel is not lower than that of base metal is met, meanwhile, the corrosion resistance of a welding seam is equivalent to that of the base metal, and the requirement for corrosion resistance of components in the marine atmospheric environment is met.

The application provides a weathering steel surface rust layer stabilizing treatment liquid and a treatment method, and the composition of the treatment liquid is as follows: Cu(NO3)2: 0.5-1.0%, FeCl3: 0.5-1.0%, NaHSO3: 0.1-0.5%, Na2MoO4: 0.05-0.15%, Fe3O4: 0.5-2.0%, and the rest is deionized water; (5*NaHSO3+FeCl3) / Na2MoO4=20-25. Compared with the prior art, the weathering steel surface rust layer stabilizing treatment method provided by the application can promote the weathering steel surface to quickly form a dense and stable alpha-FeOOH, improve the atmospheric corrosion resistance, and the corrosion rate of the rust layer after reaching stability is less than or equal to 75% of the weathering steel without treatment. The treated weathering steel can be used in a climate environment (industrial atmosphere, rural atmosphere). Moreover, the treatment construction of the application is convenient, economical and environmentally friendly.

A 460 MPa-grade corrosion resistant steel plate, and a production method thereof, adopts a corrosion-resistant alloying composition system with combined addition of Cr+Ni+Mo+Cu+P, which ensures corrosion resistance and weldability while economizing the use of precious alloys. Based on the comprehensive design of chemical components, through precise control of process parameters during rolling and cooling processes, accurate control of the steel plate's microstructure, inclusion content and size is achieved, obtaining a 460 MPa-grade steel plate for wind tower with excellent comprehensive properties and marine atmospheric corrosion resistance.

The invention discloses steel for a photovoltaic pull rod with the yield strength of 400 MPa and a preparation method of the steel. The preparation method of the steel for the photovoltaic pull rod with the yield strength of 400 MPa comprises the steps that primary smelting, LF refining, RH vacuum treatment, continuous casting and wire rod rolling are conducted, and on the basis that the atmospheric corrosion index I is larger than or equal to 7, the chemical components of the steel for the photovoltaic pull rod with the yield strength of 400 MPa comprise, by mass, 0.06%-0.11% of C; 0.15% to 0.30% of Si; mn < = 0.70%; less than or equal to 0.020% of S; less than or equal to 0.020% of P; 0.50% or less of Ni; 2.50% to 3.50% of Cr; 0.23% to 0.35% of Cu; 0.10% or less of Ti; a certain amount of Cr and Cu corrosion-resistant weather-resistant elements are added on the basis of 0.10% of C and 0.5% of Mn on the basis that the atmospheric corrosion index I is larger than or equal to 7, meanwhile, Ti and Al components in steel are controlled in the smelting process, a structure with pearlite as the main part is obtained by controlling the wire rod rolling technology, good weather resistance is achieved, steel is effectively saved, and the production cost is reduced. And meanwhile, the strength of the steel for the photovoltaic pull rod is improved, and certain machining toughness is kept.