1287 results about "Steel casting" patented technology

The invention relates to the technical field of sleeve grinding, and discloses cast steel sleeve precise grinding equipment which comprises a grinding wheel grinding mechanism, a chuck is installed below the grinding wheel grinding mechanism, a plurality of clamping jaws are installed in the chuck, and the tops of the clamping jaws do not exceed the upper surface of the chuck. An outer clamping jaw away from the circle center of the chuck and an inner supporting jaw close to the circle center of the chuck are installed on the surfaces of the clamping jaws correspondingly, a transmission range extending piece capable of enabling the outer clamping jaw and the inner supporting jaw to do range extending motion is installed on the surface of each clamping jaw, and rack limiting pieces used for limiting the outer clamping jaw and the inner supporting jaw to do one-way range extending motion are installed on the inner wall of the chuck. Through the design of the outer clamping jaw and the inner supporting jaw, compatibility of outer wall polishing and inner wall polishing in the same working procedure is achieved, compared with a traditional single inner supporting or outer clamping mode, the problem of polishing blind areas caused by clamp occupying is avoided, it is ensured that the inner wall and the outer wall of the cast steel sleeve can be completely machined at a time, two-time clamping is not needed, and the machining efficiency is improved. And the processing efficiency and the integrity are obviously improved.

The invention relates to the technical field of steelmaking continuous casting, and discloses a high-pulling-speed continuous casting method for a low-carbon high-sulfur steel chamfering crystallizer, a chamfering crystallizer continuous casting machine is adopted, and in the casting process, a low-carbon high-sulfur steel casting blank is prepared by controlling the narrow face taper, the narrow face cooling water flow and the casting superheat degree of the chamfering crystallizer. According to the method, the problems that when the low-carbon high-sulfur steel is cast through a chamfering crystallizer continuous casting machine, the narrow face of a casting blank is seriously sunken, and crack defects are prone to occurring can be solved.

The invention discloses a production method for reducing slag runners in a spring steel square billet casting process, which specifically comprises the following steps: the superheat degree of continuous casting molten steel is 20-40 DEG C, slag is automatically added into a continuous casting square billet, and casting powder is conveyed into a crystallizer by taking compressed air as a carrier, so that a high-concentration compressed air atmosphere at an upper opening of the crystallizer is ensured, and the casting quality is improved. And a combustion-supporting effect is achieved on the casting powder, so that the melting effect of the casting powder is improved. And the insertion depth of the submersed nozzle is 70-80mm, so that the higher temperature of molten steel on the meniscus of the crystallizer is ensured, and the slag surface melting effect is improved. The slag line is not changed in the casting process; the crystallizer uses vibration parameters with high vibration frequency and high amplitude, so that the negative slippage time and the vibration advance amount of the crystallizer are improved, the inflow of liquid casting powder in an air gap between a steel billet and a copper pipe is facilitated, and the slag runner phenomenon in the casting process of the casting blank is avoided.

The present invention relates to a heat treatment method for a high-strength, tough, lightweight, wear-resistant high-manganese steel casting, and the steps are as follows: pretreatment: coating an anti-oxidation protective coating on the surface of the high-manganese steel casting; water toughening treatment: heating the high-manganese steel casting to the water toughening temperature at a preset speed, keeping the temperature and then water quenching; cryogenic treatment: cooling the high-manganese steel casting after water toughening to the cryogenic treatment temperature and keeping the temperature; aging treatment: heating the high-manganese steel casting after cryogenic treatment to the aging temperature and keeping the temperature, keeping the temperature, and then air cooling to room temperature, and the interval between cryogenic treatment and aging treatment is not more than 1h; shot peening treatment: shot peening treatment is performed on the surface of the high-manganese steel casting after aging treatment. The present invention utilizes a combination of water toughening, cryogenic treatment and aging treatment to obtain a single austenite structure, obtain an effective dispersed nano-scale carbide structure, and effectively improve the grain refinement and solid solution strengthening effect of the high-strength, tough, lightweight high-manganese steel.

The invention relates to the technical field of precision casting, and discloses a high-precision control method for stainless steel castings, which comprises the following steps: preparing raw materials, recording component characteristics of the raw materials, designing a formula proportion of the raw materials, carrying out pouring process design, and setting a parameter control system in each link of pouring, according to the shape of the needed stainless steel casting, mold design and manufacturing and mold quality control are carried out, grinding tool design parameters are recorded, a stainless steel casting solidification process simulation model is established according to raw material component characteristics, a raw material formula proportion, a designed pouring process and the mold design parameters, and the casting solidification process is simulated in the model. The method comprises the following steps: predicting a defect area in a casting production process, carrying out advanced prevention and optimization treatment on the defect area according to the predicted defect area in the casting production process, strengthening a refining degassing operation in a casting process, further carrying out a metal solution purification step after refining degassing, and demolding the casting, and the mold is cleaned, checked and maintained in time.

A seamless flux-cored wire for 10CrNiCu steel for ships, applied to welding of continuous casting 907A steel for a main hull and composed of a low-carbon steel sheath and a flux core. The diameter of the wire is 1.0-1.4 mm; the filling rate of flux-cored powder is 14%-16%; measured as the mass percentage of the flux-cored wire, the flux core contains rutile, aluminum oxide, ferroboron, zircon sand, quartz, bismuth oxide, potassium titanate, sodium fluoride, electrolytic manganese, ferrotitanium, magnesium powder, manganese-silicon alloy, nickel powder, metal chromium, copper powder, and iron powder. The seamless flux-cored wire for 10CrNiCu steel for ships has the advantages of good welding performance, stable mechanical properties, good crack resistance, low diffusion hydrogen content, high moisture absorption resistance, excellent rust resistance, and the like. Also provided is a method for manufacturing the seamless flux-cored wire for 10CrNiCu steel for ships

The invention relates to the technical field of manufacturing of engineering machinery parts, and discloses an engineering machinery driving wheel made of a medium carbon alloy cast steel material. The invention also discloses a preparation process of the engineering machinery driving wheel material, which comprises the following steps: S1, casting treatment: melting the medium carbon alloy steel material, and casting into a driving wheel blank; s2, normalizing heat treatment: carrying out normalizing heat treatment on the driving wheel blank; s3, rough machining treatment; s4, quenching treatment: carrying out induction quenching treatment; and S5, finish machining treatment. The synergistic effect of alloy elements in a medium carbon alloy cast steel material is combined with an optimized air cooling process, so that the cast steel is normalized to obtain a uniform structure which mainly contains superfine pearlite and contains extremely little ferrite, the matrix hardness is stable, and the requirement of a high-performance driving wheel is completely met; after the process route is improved, tempering and shot blasting and flaw detection procedures after tempering are canceled; the technological process is greatly shortened, material turnover is reduced, and the production efficiency is improved.

The invention discloses a polishing device and a polishing method for an inner curved surface of a steel casting, and relates to the technical field of cast steel production. The device comprises a main body frame and a polishing device, wherein the main body frame comprises a mounting table arranged on the main body frame; the stirring mechanism comprises a plurality of profiling plates which are mounted on the mounting table and used for stirring abrasive particle flow in the casting blank, and a plurality of rotating wheels are rotationally mounted on the inner wall of each profiling plate; the back pressure mechanism is used for driving the profiling plate to enter the casting blank; the rotating wheel is driven to rotate through resistance of abrasive particle flow, so that the abrasive particle flow completes switching between the distance from the abrasive particle flow to the central axis of the casting blank, and meanwhile, in the revolution process of the profiling plate, the abrasive particle flow in the casting blank is extruded up and down in a reciprocating mode through the action of a reciprocating mechanism; and the abrasive particle flow circularly polishes the inner wall of the casting blank up and down, so that the purposes of fully switching and contacting the abrasive particle flow and the inner wall of the casting blank, ensuring the polishing quality and improving the polishing efficiency are achieved.

The invention discloses a water-based zircon powder coating which comprises the following components in parts by weight: 100 parts of refractory aggregate, 4-10 parts of a binder, 2-5 parts of a dispersing agent, 2-8 parts of a suspending agent, 0.1-2 parts of a wetting agent, 1-4 parts of a defoaming agent, 1.5-3 parts of a coalescing agent and 10-30 parts of water, the refractory aggregate is zircon powder and comprises coarse powder and fine powder; the suspending agent comprises cellulose modified magnesium silicate and a component 2, and the component 2 comprises at least one of sodium bentonite, lithium bentonite and attapulgite. According to the water-based zircon powder coating disclosed by the invention, the density, the solid content and the like of the coating are maintained at a relatively high level while the water-based zircon powder coating has low viscosity, so that the coating establishment efficiency is effectively improved, and the one-time spraying thickness can reach 1.0-1.2 mm; the coating drying time is greatly shortened, and the working efficiency is improved; the coating is excellent in sand burning resistance and good in stripping performance, is used for casting production, especially large steel casting production, and greatly reduces casting defects and post-treatment workload.

The steering cast steel joint comprises a connecting bent pipe, a clamping structure and a bearing platform structure, an inserting channel used for installing a steel strand is formed in the connecting bent pipe, and the inner diameter of the inserting channel is larger than the outer diameter of the steel strand; the clamping structure is mounted on the steel strand; and the clamping structure is suitable for being clamped on the bearing platform structure to limit the steel strand, so that a mounting gap is formed between the steel strand and the inner wall of the insertion channel. The structure ensures that a mounting gap is formed between the steel strand and the inner wall of the insertion channel, the situation that friction is generated between the steel strand and the inner wall of the insertion channel, and consequently a coating on the surface of the steel strand is abraded is avoided, and the durability of the steel strand is improved.

The invention relates to a rotor type compressor pump body and a manufacturing method, the rotor type compressor pump body comprises a cylinder body, the cylinder body is internally provided with a compression cavity, and the inner peripheral wall is radially provided with a sliding vane seat for accommodating a sliding vane and an air suction seat; a crankshaft; a piston; an upper bearing cover; a lower bearing cover; and at least one of the cylinder body, the upper bearing cover and the lower bearing cover is formed by compounding an insert and a light material. The insert made of the same material in the prior art and the light material are formed through injection or die casting, and the insert is in contact with the crankshaft or the piston or the slip sheet, so that the wear resistance of the pump body is ensured, and the light weight of the pump body of the compressor is also ensured; in addition, compared with conventional casting production of iron castings and steel castings or production of other metallurgical materials, the composite part formed by combining the insert and the base body can reduce the cost and also can be beneficial to energy conservation and environmental protection. And for the insert, large-scale production and processing can be carried out.

The invention relates to the technical field of steel casting cutting, in particular to high-speed cutting equipment for machining steel castings, which comprises a rectangular cross beam frame, mounting seats are fixedly mounted at two ends of the cross beam frame, and an adjusting component is fixedly mounted on the front end face of the cross beam frame and can reciprocate along the length direction of the cross beam frame. The cutting assembly is fixedly installed on the front end face of the adjusting assembly, the adjusting assembly can drive the cutting assembly to conduct angle adjustment, and the cutting assembly conducts cutting machining on the steel casting through high-speed rotation. The cutting tool bit and the fixing piece can be independently replaced, the single-point maintenance cost is reduced, the limitation that a traditional tool needs to be integrally replaced when damaged is avoided, an annular cavity and a flow guide channel in the cutting rotary disc and spray holes and ventilation through holes in the fixing piece dissipate heat cooperatively, the temperature of a cutting area can be remarkably reduced, and the cutting efficiency is improved. The phenomenon of heat accumulation is avoided, the wear rate of the cutter is reduced, and the service life of the cutter is prolonged.

The invention discloses chromium-free and carbon-free complex-phase corundum stuffing sand for smelting variety steel and a preparation method of the chromium-free and carbon-free complex-phase corundum stuffing sand. The stuffing sand is prepared from the following raw materials in parts by mass: 60 to 90 parts of complex phase corundum subjected to silica sol dipping and coating treatment, 5 to 30 parts of zircon sand, 0.5 to 10 parts of sintering aid, 0.5 to 2 parts of silica sol and 1.5 to 5 parts of aluminum-silicon modifier. The preparation method comprises the following steps: uniformly mixing the multiphase corundum subjected to silica sol dipping and coating treatment, the zircon sand and the sintering aid, adding the silica sol, uniformly mixing, adding the aluminum-silicon modifier, uniformly mixing, drying at 150-250 DEG C, removing false particles, and screening to obtain the stuffing sand. The ladle filler sand is suitable for smelting of special varieties of steel, a compact isolation layer can be rapidly formed on the hot surface of a nozzle part of a refined steel ladle, permeation and erosion of molten steel / slag are effectively prevented, the self-casting rate of the refined steel ladle of the variety of steel with high added value is increased, oxygen burning casting is reduced, continuous casting broken casting is reduced, efficient and smooth continuous casting production is guaranteed, and the quality of a steel casting blank is improved.

The present invention discloses a production method for reducing slag grooves during the casting process of spring steel billets, specifically: the superheat degree of the continuous casting molten steel is between 20 and 40°C, slag is automatically added to the continuous casting billet, and the protective slag is transported to the crystallizer through compressed air as a carrier, thereby ensuring a relatively high concentration of compressed air atmosphere at the upper mouth of the crystallizer, which has a combustion-supporting effect on the protective slag, thereby improving the melting effect of the protective slag. The insertion depth of the submerged nozzle is 70‑80mm, which ensures a relatively high temperature of the molten steel on the meniscus of the crystallizer, thereby improving the melting effect of the slag surface. The slag line remains unchanged during the casting process; the crystallizer uses high-frequency and high-amplitude vibration parameters to increase the negative slip time and the crystallizer vibration advance, which is beneficial to the inflow of liquid protective slag into the air gap between the billet and the copper tube, thereby avoiding the slag groove phenomenon during the billet casting process.

The utility model discloses a marine cast steel gate valve which comprises a gate valve body, the bottom end of the gate valve body is fixedly connected with a T-shaped pipe, the left end of the T-shaped pipe is fixedly connected with a concentric-square-shaped pipe, the other side of the concentric-square-shaped pipe is fixedly connected with a connecting pipe, and two filtering pieces are installed on the concentric-square-shaped pipe. And the bottom of the concentric-square-shaped pipe is fixedly connected with two blow-down valves. According to the utility model, the filtering piece sends out an electric signal to an external control end to prompt cleaning, at the moment, the first electromagnetic valve and the second electromagnetic valve of the other flow channel are firstly opened, then the first electromagnetic valve and the second electromagnetic valve of the current flow channel are closed, and the backflow piece communicated with the current flow channel is opened; at the moment, the water flow filtered by the backflow piece reversely flows to the filtering piece in the current closed flow channel for back flushing, and a blow-down valve at the bottom is opened to realize back flushing, so that the device has the advantages that the valve body is protected, the filtering structure can be self-cleaned, and normal operation of equipment is ensured while cleaning is realized.

The present invention discloses a fine-grained, high-hardness and toughness martensitic wear-resistant cast steel and its preparation method and application, belonging to the technical field of wear-resistant cast steel and its heat treatment. The chemical composition of the fine-grained, high-hardness and toughness martensitic wear-resistant cast steel is, by mass percentage, C: 0.45-0.65%, Si: 0.5-2.0%, Mn: 0.4-1.0%, Cr: 0.6-1.4%, Ni: 0.3-1.2%, Mo: 0.2-0.7%, Zr: 0.01-0.06%, P≤0.032%, S≤0.040%, the balance being Fe and unavoidable impurities, 5.5×10 ‑7 ≤[Zr][C]wt%≤35×10 ‑7 The present invention optimizes the alloy composition and heat treatment process and utilizes liquid precipitation Zr (C, N) to refine the grains. The high-hardness and toughness martensitic wear-resistant cast steel obtained is particularly suitable for the preparation of wear-resistant parts under medium and low stress impact abrasive wear conditions.

The invention provides a method for improving homogenization of a bearing steel casting blank, belongs to the technical field of steel smelting processes, and solves the technical problems that in the continuous casting process of bearing steel, large-size compounds are easily formed due to high carbon and high chromium content, and micro segregation regulation and control of the bearing steel are difficult to solve by traditional electromagnetic stirring and soft reduction process parameters. According to the method for improving the homogenization of the bearing steel casting blank through soft reduction and tail end electromagnetic stirring coupling, a bearing steel continuous casting solidification mathematical model is established and corrected, and pouring condition technological parameters are input to provide basic data and boundary conditions for establishing the bearing steel continuous casting solidification heat transfer mathematical model; the method is applied to soft reduction process parameter design and is matched with adjustment of the tail end electromagnetic stirring position, the soft reduction technology and tail end electromagnetic stirring are coupled to be implemented, the solid fraction coupling rule between soft reduction and tail end electromagnetic stirring is determined, the homogeneity of a casting blank is jointly improved from the two dimensions of solidification structure and solute distribution, and center segregation is improved; and the structure uniformity is improved.

The invention discloses high-strength, high-toughness and high-wear-resistance low-carbon chromium-molybdenum alloy cast steel and a heat treatment process, belongs to the technical field of cast steel and heat treatment, and solves the technical problem that AS-1444-Grade4320 alloy steel subjected to heat treatment is insufficient in comprehensive mechanical property. By properly increasing the contents of C, Si and Mn elements, the upper limit of the body strength is increased, and the alloy structure is improved in cooperation with adjustment of Cr, Mo, Ni and other alloy elements; on the basis of component design, the heat treatment process of normalizing, quenching and tempering is adopted, after heat treatment, the metallographic structure is tempered sorbite, the grain size reaches the level 9, the strength, toughness and wear resistance of the casting are obviously improved, meanwhile, the hardness of the casting is controlled within the reasonable range, the wear resistance of the casting is better matched, and the service life of the casting is prolonged. Comprehensive service performances such as wear resistance and fatigue resistance are improved, and the service life and the use efficiency of the casting are effectively improved.

The invention belongs to the field of iron and steel smelting, and relates to a method for eliminating stripes on the surface of a duplex stainless steel S32205 cold coil, which eliminates the stripe defect on the surface of the duplex stainless steel S32205 cold coil, ensures that the cold coil leaves a factory with a high-quality qualified surface, and meets the requirements of special fields. According to the technical scheme, the method comprises the steps that a duplex stainless steel casting blank with the thickness of 160-200 mm is ground, the grinding pressure is adjusted to be minimum, the grinding current is 10-50 A, the advancing speed of a trolley is 10-50 m / min, the surface roughness after grinding is 40-100 microns, and the surface after grinding is free of iron oxide scale residues generated by grinding.

The invention belongs to the technical field of cold forging steel manufacturing, and particularly discloses a production method of high-aluminum cold forging steel for medium-strength and high-strength standard parts, which comprises the following steps: controlling the slag alkalinity, the contents of C, S and P in molten steel, the tapping temperature, the thickness of a steel ladle slag layer and the tapping time during converter smelting; a deoxidizing agent, lime, low-carbon ferromanganese, silicon-manganese alloy, aluminum-iron alloy and a carburant are added, argon is blown into molten steel when calcium-iron wires are fed in an argon blowing station, components of a refining slag modifier are controlled to be added during LF refining, calcium carbide and the aluminum-iron alloy are added according to the oxygen content and the aluminum content in the molten steel, a tundish for continuous casting is protected by argon, and the molten steel is continuously cast. The thickness of a powder slag layer and the thickness of a liquid slag layer are controlled, a covering agent is added into the tundish, the purity of molten steel is increased by adjusting the whole process section, and therefore follow-up tundish nozzle nodulation is reduced, and the problem that in the prior art, due to the fact that the purity of molten steel is low, a high-aluminum cold heading steel casting continuous casting tundish nozzle is prone to nodulation is solved.

The invention provides low-temperature cast steel for polar ships and a heat treatment process of the low-temperature cast steel. The cast steel comprises the following chemical components in percentage by weight: 0.03-0.07% of C, 0.10-0.20% of Si, 1.3-1.5% of Mn, 3.0-4.0% of Ni, 0.80-1.00% of Al, 1.5-2.5% of Cu, not more than 0.05% of Cr and Mo, not more than 0.015% of S, not more than 0.020% of P and the balance of Fe and inevitable impurities. The cast steel has the advantages of ultra-large wall thickness, high strength, low-temperature high toughness, weldability, corrosion resistance and the like, and can meet the building requirements of polar region ship stem columns.

The invention discloses a method for preassembling an energy-saving device on a stern shaft tube section, which specifically comprises the following steps of: S1, constructing the stern shaft tube section by section, and manufacturing on a straight jig frame by taking a stern shaft tube section bow end rib plate as a base plane; s2, after segmented construction of the stern shaft tube is completed, internal components of the stern shaft tube are installed; hoisting the stern shaft tube; s3, a stern shaft tube segmented outer plate is installed, and a stern shaft tube steel casting is hoisted; s4, the stern shaft tube is subjected to sectional tire release and placed on a preassembled tire frame; s5, an energy-saving device working platform is installed on the segmented outer plate of the stern shaft tube; s6, a mounting position line of the energy-saving device is drawn on the stern shaft tube steel casting; s7, a hoisting installation line is drawn on the energy-saving device, the energy-saving device is hoisted on the steel casting, and allowance trimming is conducted on the energy-saving device; and the energy-saving device is assembled and welded, and segmented preassembling of the energy-saving device is completed. According to the method, the energy-saving device is installed on the segmented side state, so that the construction difficulty during positioning and installation of the energy-saving device is reduced.

The invention belongs to the technical field of metallurgy, and provides a method for reducing erosion of a stopper rod in pure iron continuous casting production, which comprises the following steps of: blowing argon to seal a long nozzle bowl opening in a steel casting process, adding a covering agent to execute casting and adding twice in the process, and continuously injecting argon into a tundish impact area and a stopper rod area in the production process. A spinel stopper rod is adopted, and the outer diameter of the slag line part of the stopper rod is increased; by protecting the casting process design and optimizing the size and material of the stopper rod, the problem that the stopper rod is broken in the pure iron production process is solved, and stable and efficient continuous casting production of pure iron is achieved.

The invention discloses a heavy rail steel continuous casting residual steel heat cyclic utilization method which comprises the following steps: S1, recovering the casting residual heat, and reducing the total loading amount of a converter to ensure that the clearance of a steel ladle after tapping reaches 400-500mm; s2, in the continuous casting steel ladle molten steel pouring process, part of molten steel and steel slag are reserved in pouring residues of a steel ladle after pouring is stopped; s3, the steel ladle with the pouring residues is hoisted to the position above the pouring residue tank, part of the pouring residues are poured out, and pouring residues are stopped when steel flowers appear; s4, molten steel in steel ladle remaining pouring residues is poured into a steel ladle obtained after continuous casting furnace converter tapping or poured into a steel ladle in the earlier stage of LF refining; and S5, pouring the residual pouring slag of the steel ladle into a slag ladle. According to the invention, recycling is realized from converter tapping to the earlier stage of LF refining, so that the purity of molten steel is improved, and steel ladle roughing slag is avoided; the heat of the residual steel of the continuous casting ladle can be recycled, the influence of the residual steel on the steelmaking cost is reduced, and meanwhile, the quality of molten steel is improved.

The utility model relates to the technical field of steel casting, in particular to an argon blowing tundish for continuous casting of steel billets, which is characterized in that a first argon blowing pipe, a second argon blowing pipe and an argon guiding mechanism are further connected onto a cover plate, and the first argon blowing pipe and the second argon blowing pipe are respectively arranged on two sides of a blanking pipe. The argon gas guide mechanism can guide out argon gas filled from the first argon blowing pipe and the second argon blowing pipe; the bottom of the tank body is connected with a first connecting pipe and a second connecting pipe, the tank body is connected with the two crystallizers through the first connecting pipe and the second connecting pipe, the first connecting pipe and the second connecting pipe are arranged on the two sides of the tank body respectively, and fed argon can be rapidly guided out through an arranged argon guiding mechanism. And oxygen in the tundish can be rapidly exhausted through argon, and the exhaust speed is increased.

The present disclosure provides a high-vanadium high-speed steel and preparation method therefor, and use thereof, which relate to the technical field of high-vanadium high-speed steel. The preparation method includes: smelting raw materials to form a melt; impacting the melt to a cooling platform to form a high-vanadium high-speed steel casting billet; and performing a spheroidizing annealing treatment and a quenching and tempering treatment, so as to obtain a resultant. The spheroidizing annealing treatment includes: heating the high-vanadium high-speed steel casting billet to 820-910° C.; holding for 2-4 h; then cooling down to 450-550° C. at a cooling rate larger than 40° C. / h; and then air cooling to a room temperature.

The invention relates to the technical field of cast steel material preparation, in particular to a low-temperature-resistant weldable cast steel material and a preparation technology and application thereof.The low-temperature-resistant weldable cast steel material comprises, by mass, 0.1%-0.21% of C, 0.4%-0.8% of Si, 0.9%-1.3% of Mn, 0.5%-0.8% of Ni, 0.02%-0.06% of Al, smaller than or equal to 0.3% of Cr, smaller than or equal to 0.2% of Mo and the balance Fe and inevitable impurities. By optimizing the material composition proportion and matching with preparation process control, the provided cast steel material has good low-temperature impact toughness at the low temperature of-50 DEG C and also has excellent welding performance, and the requirements under extremely cold, high-impact and heavy-load working conditions are met.

The invention discloses a production method for improving cleanliness of a wear-resistant steel casting blank, and relates to the technical field of metal material smelting and continuous casting. The method comprises the following steps: optimizing electric arc furnace smelting, and reducing the oxygen content of molten steel by adopting a specific deoxidation system; a double-slag method is adopted in the LF refining stage, the size of inclusions is reduced through Ca treatment and rare earth denaturation, and the plasticity of the inclusions is improved; the vacuum degree and the degassing time are controlled in the RH degassing process, and the gas content in the molten steel is further reduced; and finally, an optimized protective casting process is adopted in the continuous casting process, a flow field is optimized in combination with electromagnetic stirring (EMS), and formation of secondary inclusions is reduced. By means of the method, the total amount of inclusions of the wear-resistant steel casting blank can be reduced by 30%-50%, the oxygen content is reduced to 0.0010% or below, the cleanliness of the casting blank is remarkably improved, and the comprehensive performance of the wear-resistant steel is improved. The method is stable in process and suitable for industrial production.

The invention discloses a low-cost method for purifying and modifying steel rail inclusions and improving comprehensive mechanical properties of the steel rail inclusions, and the method comprises the following steps: adding a rare earth iron alloy containing 30% of rare earth into molten steel in VD (vacuum degassing), and determining O in the steel before adding, the O is required to be less than or equal to 10ppm, so that the prepared molten steel for continuous casting comprises the following chemical components in percentage by mass: 0.78-0.85% of C; 0.50% to 0.60% of Si; 1.10% to 1.30% of Mn; less than or equal to 0.020% of P; s < = 0.008%; 0.20% to 0.30% of Cr, 0.003% to 0.008% of RE iron alloy or 0.0010% to 0.0024% of RE; and the balance of Fe and inevitable impurities. According to the method, A-D type inclusions in the steel can be obviously reduced, the purification effect and the modification effect of rare earth on the steel inclusions are fully achieved, and the service life of the steel rail is prolonged.

The invention provides a steel casting surface anti-corrosion treatment device and method.The steel casting surface anti-corrosion treatment device comprises a sand blasting machine body, a mounting assembly is arranged in the sand blasting machine body, a fixing device is arranged above the mounting assembly, the fixing device comprises a double-end hydraulic telescopic rod, and the two ends of the double-end hydraulic telescopic rod are connected with connecting frames; fixing blocks are connected to the opposite sides of the two connecting frames; the spraying head is mounted at the top of the inner wall of the spraying machine body, the mounting assembly comprises a mounting base, and fixing rods are symmetrically connected to the two sides of the surface of the mounting base. According to the steel casting surface anti-corrosion treatment device provided by the invention, the mounting base is arranged at the bottom of the inner wall of the sand blasting machine main body, and the mounting plate with the two fixing rods, the double-end hydraulic telescopic rod with the two connecting frames and the fixing block are matched for operation; and the operation of manually taking the steel casting can be replaced, and the safety during operation can be improved.