1252 results about "Ferrotitanium" patented technology

The invention discloses a wear-resisting alloy steel with high boron, high chrome and low carbon and a preparation method thereof, which comprises the following chemical constituents in weight percent: 0.1-0.5% of C, 3-26% of Cr, 0.5-1.2% of Si, 0.5-1.5% of Mn, 0.3-2.8% of B, 0.3-2.6% of Cu, 0.2-0.6% of Ti, 0.02-0.15% of Ca, 0.03-0.25% of Ce, 0.02-0.18% of N, 0.05-0.3% of Nb, 0.04-0.09% of Al, 0.02-0.15% of Mg, 0.04-0.13% of K, less than 0.03% of S, less than 0.04% of P and the balance Fe and unavoidable impurity elements. The method comprises the following steps: melting steel scrap and chromium iron in an electric furnace; adding copper plates, ferrosilicon, ferromanganese into the melted steel scrap and chromium iron, heating the melt to 1560-1620 DEG C after the constituents are adjusted to be qualified in stokehold; adding calcium-silicon alloy and aluminium deoxidation into the melt; and then adding ferrotitanium and ferroboron in sequence, melting and discharging; roasting the compound inoculant composed of granular rare earth magnesium alloy with the diameter being less than 12mm and cerium metal, Si3N4, VN, Nb and K; placing the roasted compound inoculant at the bottom ofa steel ladle; carrying out modification and inoculation processes on the smelted liquid steel by pour-over method in the steel ladle, wherein, the pouring temperature of the liquid steel is 1400-1450DEG C; heating castings to 920-1150 DEG C and preserving heat for 2-4 hours; and air cooling the castings to room temperature to obtain the alloy steel in the invention. The alloy steel of the invention has the advantages of high strength, rigidity and toughness, good thermal fatigue resistance property, wear resistance, and low manufacture cost.

The invention relates to an iron alloy fusing sample preparation method for X-ray fluorescence spectrum analysis, belonging to the technical field of materialization detection and aiming to solve the problem that fusing a film production alloy sample can erode a platinum crucible. The method comprises the steps of building up wall of the platinum crucible, preparing an oxidizing agent, pre-oxidizing an iron alloy sample and fusing and preparing sample from the iron alloy sample. The invention provides the fusing sample preparation method suitable for various iron alloys such as ferromanganese, silicomanganese, calcium silicon, ferrosilicon, ferromolybdenum, ferrotitanium, cymrite, ferrochrome, ferrocolumbium, ferrovanadium, silicon silicomanganese and the like. By adopting the method, a glass fusing piece can be manufactured without eroding the valuable platinum crucible, the sample can be completely oxidized in the sample preparation process, the sample preparation time is short, the prepared glass fusing piece is uniform and perfect, and the mineral effect and the granularity effect can be completely eliminated. The invention has safe and reliable method, simple and convenient operation and good repeatability, is suitable for various iron alloy samples and widens the application range of the fluorescence analysis.

The invention provides a high hardness ferrite stainless steel wearable flux-cored wire, which takes a low carbon steel H08A cold rolling thin steel strip as an external wrapper; furthermore, the wrapper is internally provided with a powder core which is composed of graphite, metal and alloy powder; the weight percentages of all ingredients of the powder core are 50-75% of high carbon ferrochrome, 10-16% of ferrovanadium, 6-10% of ferrotitanium, 2-10% of tungsten carbide, 2-3% of nickel powder, 1.5-2.5% of silver graphite, 1-3.5% of boron carbide, 1-2% of aluminium magnesium powder, 0-10% of metallic chromium, and the residual quantity of reduced iron powder; the filling proportion of the powder core is 46-50%; the invention adopts the technical proposal that high-content ferrovanadium and adequate alloy powders such as tungsten carbide and boron carbide, etc. are added into the flux-cored wire, changes the microstructure of the existing ferrite stainless steel flux-cored wire surfacing alloy, overcomes the shortages of poor wearability and ductility, and can be applied to submerged arc bead weld manufacture or repair of the parts which has high requirement of abrasion and the corrosion resistance of the wearable grain.

The invention relates to high-strength weathering steel and a method for producing same. The high-strength weathering steel comprises the following components by weight percent (wt%): 0.001-0.004 percent of C, 0.10-0.30 percent of Si, 0.40-0.70 percent of Mn, 0.020 percent of P or less, 0.008 percent of S or less, 2.50-3.50 percent of Cr, 0.20-0.40 percent of Ni, 0.25-0.50 percent of Cu, 0.01-0.03 percent of Re, 0.02-0.06 percent of Al, 0.001-0.004 percent of Ca, 0.001-0.005 percent of N, 0.01-0.03 percent of Ti, 0.01-0.03 percent of Nb and the balance of Fe and other inevitable impurities. After the molten iron is fully deoxidized and before the refining of the molten iron is finished, ferrotitanium is added to steel ladle, a Ca wire is fed to the steel ladle, a Re wire is fed into a continuous casting crystallizer, and a slab is reheated at 1180-1300 DEG C; the two-stage controlled rolling is adopted; the ratio of the thickness of the intermediate slab to the thickness of the finished product is controlled at 3.0; the refining outlet temperature is controlled at 890-1050 DEG C; the finishing rolling temperature is controlled at 800-860 DEG C; the rate of cooling after finishing rolling is controlled at 10-15 DEG C per second; and the winding temperature is controlled at 580-640 DEG C. The invention has the advantages that the relative corrosion rate of the weathering steel subjected to the 72h periodic infiltration is less than 30 percent compared with that of the steel Q345B, the weathering performance of the weathering steel is obviously better than the traditional high-strength weathering steel, and the weathering steel of the invention has the yielding strength of more than 550 Mpa and the elongation rate of more than 24 percent. The high-strength weathering steel of the invention can be applied to the fields of the railway truck, the container, the bridge, the communication, the power tower and the like.

The invention relates to an electric welding rod used for manual welding. The electric welding rod comprises core welding-wires containing the following chemical compositions (wt%): 0.020-0.100 of C, 0.350-0.550 of Mn, 0.015-0.030 of Si, 0.005-0.015 of P, 0.002-0.005 of S, 0.01-0.20 of Cr, 0.01-0.30 of Ni, 0.01-0.20 of Cu, 98.675-99.47 of Fe, and the residue of impurity; the electrode coating comprises the following compositions: 28-38 of marble powder, 16-28 of fluorite powder, 2-8 of feldspar powder, 2-7 of white titanium pigment, 4-8 of electrolytic manganese, 3-7 of ferrosilicon powder, 6-9 of ferrotitanium powder, 0.5-2 of ferromolybdenum powder, 3-8 of nickel powder, 10-25 of iron power and 5-8 of other elements. The chemical compositions, the performance and the structure of the welding seam of a grade X80 steel pipe welded by using the electric welding rod are closer to the pipe body, and without heat treatment, the welding seam can meet the requirements on technical indicators such as high strength, high toughness, low hardness and the like of the grade X80 steel pipe used for oil and natural gas transferring; the electric welding rod overcomes the defaults in the prior art that the welding seam is required to be heat-treated after welding, the quality is poor, and engineering accidents are easy to happen when in use and the like.

The invention relates to a novel industrialized method for comprehensively utilizing vanadium titanium iron ore concentrate. Raw material, an additive and a solid reducing agent are made into a higher-density round ingot through a full automatic press after being mixed evenly by an edge mill; the mixed material is charged into a gradient alloy can and is directly reduced in a tunnel kiln; and after being crushed, the reduced ingot is ground and is magnetically separated to obtain high-quality sponge iron with 92 to 96 percent of TFe and material containing abundant vanadium and titanium with 2.8 to 3.4 percent of V2O5 and 48 to 49 percent of TiO2. After being cold formed, the sponge iron is used for electric steelmaking or is sold as iron powder through deep processing. The material containing abundant vanadium and titanium can be used for producing V2O5 with the purity more than or equal to 98.5 percent through a simplified wet method vanadium extraction process; and vanadium slag with the TiO2 content more than or equal to 48 percent can be used as sulfuric acid method titanium white or other industrial raw materials. The method can greatly improve the capacity of the tunnel kiln and the service life of a charging vessel, has high comprehensive utilization degree, reliable technology, investment conservation and low production cost, energy conservation and emission reduction, and little pollution, and creates conditions for industrialization.

The invention relates to an iron powder production method by using a tunnel kiln to reduce concentrate pellets containing carbon vanadium ferrotitanium with titanium slag and vanadium pentoxide as combined products. Concentrate pellets are made from vanadium-titanium iron concentrate through crashing and damp milling. The iron powder and tailings are obtained by putting the concentrate pellets into the tunnel kiln to be reduced, crashing, wet-grinding, magnetic separation and gravity separation. The tailings are soaked with titania waste acid to eliminate remnants magnesium and iron. Then the tailings are filtrated and dried to obtain a new material. And then the new material is added with sodium salt to do salt roast and then to be soaked by water, then titanium slag and sodium vanadate are obtained respectively after the water soaking. At last, the vanadium pentoxide is obtained by ammonium vanadate precipitating and calcination deaminase to the sodium vanadate liquid. The invention eliminates the disadvantage of high energy consumption by electric furnace smelting and bad separating effect of vanadium and titanium, difficult control of vanadium and titanium trend and low yield rate of extracting vanadium and titanium through converter blowing iron molten, etc. The invention has the advantages of high yield rate of vanadium, titanium and iron and high resources utilization rate and explores a novel practical way for comprehensive utilization of vanadium, titanium and iron concentrate ore.

The invention relates to a welding material technology, in particular to a nickel-base welding rod. The welding rod uses a SNi6062 welding wire as a core wire. The electrode coating comprises the following solid ingredients in percentage by mass: 36-50% of rutile, 2-7% of titanium pigment, 20-30% of fluorite, 3-8% of cryolite, 2-4% of phlogopite, 2-4% of zircon sand, 0.5-1.5% of sodium carbonate, 5-10% of manganese metal, 2-4% of ferrotitanium containing 25-35% of Ti, and 2-4% of ferroniobium containing 50-60% of Nb. The nickel-base welding rod has the advantages of favorable performance of production technique, smooth welding rod surface, high yield, stable eccentricity; during welding, the nickel-base welding rod has the advantages of stable electric arc, basically no splash, favorable slag detachability and outstanding operating performance; and the appearance of the welding seam is beautiful, the height of a weld bead is moderate, the wetting angle of a welding seam is moderate, and the strength and plasticity of deposited metals are moderate.

The invention provides high-boron high-chromium low-carbon high-temperature-resistant wear-resisting alloy steel and manufacturing method thereof. The chemical content of the alloy steel includes, by weight, 0.10%-0.5% of C, 3%-26% of Cr, 0.5%-4% of W, 0.5%-1.2% of Si, 0.5%-1.5% of Mn, 0.7%-3.5% of B, 0.3%-2.6% of Cu, 1.5%-2.4% of Al, 0.8%-1.6% of Ti, 0.02%-0.15% of Ca, 0.03-0.25% of Ce, 0.02%-0.18% of N, 0.05%-0.3% of Nb, 0.12%-0.25% of Mg, 0.04%-0.13% of K, 0.05%-0.12% of Ca, 0.06%-0.15% of Ba, less than 0.03% of S, less than 0.04% of P and the balance Fe and unavoidable impurity elements. After steel scrap and ferrochromium are melted in an electric furnace, a copper plate, silicon iron and ferromanganese are added to the electric furnace, after content is qualified through pre-furnace adjustment, the temperature of a melt rises to 1560-1620 DEG C, calcium-silicon alloy and deoxidation aluminum are added, ferrotitanium, ferroboron and metal aluminum are sequentially added and poured out of the furnace after being melted, granular rare earth magnesium alloy with a diameter of less than 12mm and a composite inoculant composed of metal cerium, Si3N4, VN, Nb and K are placed at the bottom of a steel ladle after being roasted, metaphoric inoculation processing is carried out on smelt liquid steel in a in-ladle pouring mode, the liquid steel pouring temperature ranges from 1400 DEG C to 1450 DEG C, and a casting piece undergoes air cooling for 2-4 hours at the temperature of 920-1150 DEG C.

The invention relates to a flux-cored wire for austenitic stainless steel all-position welding, and the flux-cored wire is composed of a flux core and an external stainless steel belt, wherein, the flux core accounts for 22-24wt% of the flux-cored wire, and the flux core comprises the following components in percentage by weight: 20-23% of metal chromium powder, 7-8.5% of metal nickel powder, 2-4% of electrolytic manganese metal, 3-4% of aluminium powder, 0.5-1% of ferrotitanium, 32-34% of rutile, 1-2% of quartz, 2-4% of zircon sand, 4-6% of albite, 2-4% of potassium feldspar, 1-1.5% of cryolite, 1-1.5% of lithium carbonate, 0.1-0.5% of bismuth oxide and the balance of iron powder. The ratio of the albite to the potassium feldspar in the flux core is 1.2-2, the sum of the albite and the potassium feldspar is not more than 10wt% of the flux core, the external stainless steel belt is the austenitic stainless steel 304L, the carbon content is less than 0.025wt%, the diameter of the flux-cored wire is 0.9-1.2mm, and the flux-cored wire can be used for realizing the austenitic stainless steel all-position welding.

The invention provides a method for preparing metallic titanium. The method comprises the following steps of: in the process of melting titanium slag by using titanium concentrate, directly adding excessive carbon-containing reducing agents to obtain titanium carbide or introducing nitrogen while directly adding the excessive carbon-containing reducing agents to prepare titanium nitride or titanium carbonitride in the melting process of the titanium slag; electrolyzing molten salts containing low-valence chloride of titanium to obtain metallic titanium powder by taking the prepared titanium carbide, the titanium nitride or the titanium carbonitride as a soluble anode and a metal material as a cathode; in addition, further electrolyzing and refining products obtained in the later period of the electrolysis to obtain high-purity titanium. The method has the advantages of simple process, low raw material cost, low energy consumption, small investment in permanent assets and the like. In addition, the prepared metallic titanium has high purity and ferrotitanium can be prepared by further electrolyzing residual anode titanium powder remained by the anode.

The invention discloses a preparing method of granular boride high-boron cast steel, which comprises the following steps: allocating 0.15%-0.45% C,0.75%-2.70% B, 0.34 %-1.50% Ti, 0.80%-1.20% Cr, 0.50%-1.50% Si, 0.50%-1.50% Mn, 0.04%-0.12% Ce, 0.08%-0.20% Al, 0.03%-0.10% Ca, 0.01%-0.06 N, P<0.05%, S<0.05% and Fe; setting B / C=5.0-6.0, B / Ti=1.8-2.2; adopting electric stove to melt; mixing common scrap steel, pig iron and chromium iron; heating to melt; adding into silicon iron and manganese iron; adding into ferroboron and ferrotitanium before tapping; adjusting furnace-front element to be quality; heating-up; adding into silicon-calcium alloy; pre-deoxidizing; end-deoxidizing with aluminum; micro-alloying; proceeding composite deteriorating process outside of the furnace with cerium and nitrogen; keeping the temperature; proceeding oil-cooling quenching; tempering under the low temperature; getting the product. This invention possesses merits of high hardness and strength and good tenacity and resistance, which can increase the durability of wear resisting part.

The invention relates to a composite roll for centrifugally casting high-chromium cast iron and a preparation method thereof, belonging to the technical field of the steel rolling. The composite roll comprises a roll external layer and a roll core. The chemical components of the materials of the roll external layer in terms of the percentage by weight are as below: 25-28 of alloy scrap iron of a high-nickel-chromium infinite chilled iron roll, 28-30 of carbon ferrochrome, 1.5-2.5 of mid-carbon ferromanganese, 2.5-3.5 of ferroboron, 0.5-0.8 of silicon-calcium-barium alloy, 0.2-0.4 of aluminum, 0.3-0.5 of ferrotitanium, 0.2-0.4 of rare earth ferrosilicon, 0.10-0.15 of zinc, 0.15-0.18 of magnesium and the balance of low-carbon waste steel sheet. The roll core is high-strength alloy cast iron or low-alloy ductile cast iron. The roll external layer and the roll core are formed through centrifugal composite casting. The roll has low production cost, contains a small number of impurities and has high degree of purity; the hardenability, the mechanical performance and the thermal fatigue of the roll can be improved; and the roll has long service life and low production cost.

The invention provides a high-boron high-speed steel roller material and a smelting process thereof. The smelting process of the high-boron high-speed steel roller material comprises the following steps: firstly, adopting Q235 waste steel, ferrotungsten, ferromolybdenum, ferrovanadium, high carbon ferro-chrome, metal copper, metal aluminum, calcium-silicon alloy, rare earth ferrosilicon magnesium alloy, ferrocolumbium, ferroboron, ferrosilicon, vanadium-nitrogen alloy, zirconium ferrosilicon and ferrotitanium as materials for smelting low-alloy high-speed molten steel in an electric furnace; then, adding the ferrovanadium and part of ferroboron to carry out alloying in a discharging process; finally, adding part of ferroboron and composite modificator in a casting ladle, adding the vanadium-nitrogen alloy, the zirconium ferrosilicon, the ferrosilicon and part of ferroboron in the casting process. The obtained casting piece has a little alloy elements, excellent abrasive resistance and good thermal fatigue resistance. When the high-boron high-speed steel roller material is used as a roller, the service life is prolonged by more than six times relative to a high nickel-chrome infinite cast-iron roller, and prolonged by 20% relative to a high-vanadium high-speed steel roller. Moreover, the roller is safe to use and reliable.

The manufacture method for low-nitrogen ferrotitanium 70Fe-Ti comprises: selecting material from industrial salt as slag-forming agent, titanium sponge, waste titanium, and high-grade waste steel or pure iron while ensuring 60-80% Ti, N íœ0.15%, Al <3%, Si íœ0.5%, C íœ0.1%, P íœ0.04%, S íœ0.03%, and Fe; melting; tapping; during process, using argon gas for protection. This invention can manufacture different high-grade stainless steel with super properties, well notch sensitivity, cooling speed effect and size effect by low cost.

The invention provides a 460MPa-level flux-cored wire for ocean engineering. The 460MPa-level flux-cored wire comprises a carbon steel sheath and a flux core, wherein the carbon steel sheath accounts for 84-87% of the total mass of the flux core; the flux core accounts for 13-16% of the total mass of the flux-cored wire; the flux-cored wire consists of the following components in percentage by mass: 30-42% of rutile, 1-2% of sodium fluoride, 3-6% of feldspar, 3-5% of ferrotitanium, 1-3% of silicon iron, 0.5-1% of rear earth, 3-5% of magnesium powder, 5-10% of electrolytic manganese, 1-2% of aluminum powder, 7-9% of nickel powder, 4-7% of ferroboron, 0.2-0.5% of graphite, 3-6% of silicon-manganese alloy, 0.5-1% of zircon sand and the balance of Fe and inevitable impurities. By virtue of control in aspects of chemical components, diffusible hydrogen, low-temperature stability and the like, the 460MPa-level flux-cored wire meets the requirements of crack resistance and low-temperature impact resistance, is good in all-position welding process, attractive in welding seam and excellent in mechanical property, has seawater corrosion resistance; and content of diffusible hydrogen of deposited metal reaches ultralow hydrogen level.

The high hardness high wear resistance self-protecting metal core built-up welding filament used in material processing engineering features the metal core comprising chromium carbide 64-77 wt%, 75# ferrosilicon 4-8 wt%, metal Mg 5-10 wt%, Al-Mg alloy 1-3 wt%, ferroborium 2-5 wt%, ferrotitanium 2-6 wt%, ferrocolumbium 1-5 wt% and ferrovanadium 1-8 wt%. Using the filament in welding needs no added protecting gas and produces no welding slag, and this makes it possible to perform continuous welding. Programming the automatic welding machine can perform automatic welding operation in high built-up welding quality. The present invention is used mainly in built-up welding for repairing coal grinding roller, cement grinding disc, chute, etc.

The invention relates to a catalyst of selective reduction of nitrogen oxide by ammonia, which mainly solves the existing problems that the commonly used NH3-SCR catalyst system is toxic to environment and human body, the anti-SO2 poisoning ability of the catalyst system is poor in the reference and the catalyst system can not adapt to the conditions of high space velocity. The invention adopts cheap and non-toxic raw materials to prepare a Fe-Ti oxide catalyst with high activity, selectivity, stability and anti-S2 poisoning ability by the simple and practicable co-precipitation method, which can better solve the existing technical problems. If the catalyst is loaded on honeycomb ceramics after being made into pulp, the catalyst is hopeful to be put into practical application of flue gas denitrification of coal-fired power plants.

The invention discloses a water-based epoxy anti-corrosive coating and a preparation method thereof, and relates to a ship antirust and cabin inside and outside antirust fireproof paint. The invention provides a water-based epoxy coating with the VOC lower than 10g / l, and the coating belongs to an environment-friendly coating, which not only has the antirust performance of anti-corrosive coating,but also has low flame propagation of cabin inside finish paint, meets the requirement of cabin inside smoke and toxin, resists aging, and is a multifunctional water-based coating, and the bottom andthe surface are combined. Zhejiang Ampang AB-EP-20 is used as the epoxy resin, Zhejiang Ampang AD-HGF is used as the curing agent, and fluorocarbon emulsion (the model of which is Beijing Baowei PF-1) is used as the base material. Wetting dispersant, defoamer I, defoamer II, flash rust inhibitor, thickener, defoamer and substrate wetting agent are used as additives, rutile titanium white powder, compound zinc phosphate, ferrotitanium powder, talcum powder, ultra-fine aluminum hydroxide, precipitated barium sulfate, mica powder and aluminum tripolyphosphate are used as pigment fillers.

The invention relates to a welding drug core welding wire used to repair the working layer of cold rolling middle roller. Wherein, said welding wire comprises coat and drug core; said drug core comprises medium-carbon ferromanganese at 1.2-1.6%, high carbon ferro-chrome at 6.0-8.0%, ferro-molybdenum at 1.0-3.0%, ferro-vanadium at 0.7-1.5%, ferrocolumbium at 0.06-0.16%, ferrotungsten at 1.0-2.8%, ferrotitanium at 0.05-0.09%, nickel at 0.7-1.2%, silicon iron at 0.80-1.5%, rare-earth at 1.0-5.0%, derbyshire spar at 4.5-10.5%, and the left is iron powder. The invention has simple method, and the rigidity is HRC55-59, without crack.

The invention relates to a metal powder-cored type nitrogen austenite stainless steel flux-cored wire and a method for manufacturing the same. The metal powder-cored type nitrogen austenite stainless steel flux-cored wire comprise a carbon steel cored shell and powder filled in the shell, and is characterized in that the powder comprises, by weight, from 35% to 45% of metal chromium, from 15% to 25% of nickel powder, from 3% to 6% of ferrochromium nitride, from 10% to 15% of silicon-magnesium alloy, from 2% to 8% of molybdenum powder, from 0.5% to 2.5% of ferrotitanium powder, from 0.5% to 1% of potassium carbonate arc stabilizers, from 0.5% to 1% of aluminum-magnesium powder, from 0.5% to 1% of bismuth oxide, from 0.3% to 0.5% of sodium oxide, from 0.01% to 0.1% of rare-earth cerium and from 1% to 10% of iron powder, and the weight of the powder ranges from 40% to 50% of the total weight of the wire. Compared with the prior art, the metal powder-cored type nitrogen austenite stainless steel flux-cored wire has the advantages that weld metal has excellent mechanical properties such as good toughness and high strength after the wire is applied to welding high-nitrogen steel, and a corrosion resistant effect is good.

The invention discloses a surfacing electrode for repairing a hot forged mould, which uses a low-carbon steel H08A core wire conforming to the GB / T3429 requirement. The solid component quality content of coating is as follows: 30-40% of marble, 12-20% of fluorite, 1.5-3% of zircon sand, 0-2% of soda ash, 2-5% of silicon epitaxy material, 1-3% of titanium white, 0-3% of flogopite, 1-2% of rare earth fluoride, 3-7% of manganese metal, 2-5% of ferrosilicon, 4-6% of ferrotitanium, 4-8% of chromium metal, 4-8% of ferromolybdenum, 6-12% of metallic nickel and 1-2% of aluminium magnesium alloy. The invention has favorable welding rod performance, smooth welding rod surface, high yield and stable eccentricity; electric arc is easy to ignite and is stable to burn; coating is even to melt, a welding line is attractive in shape, and slag is easy to clean; and a deposition metal weld metal buildup has moderate welding state hardness which reaches the requirements of the hot forged mould, thus improving the service life cycle of the hot forged mould.

The invention relates to a high-toughness high-boron medium-chrome low-carbon wear-resisting alloy steel and a preparation method thereof. The high-toughness high-boron medium-chrome low-carbon wear-resisting alloy steel comprises the following chemical components by weight percentage: 0.20-0.5% of C, 5-12% of Cr, 0.5-1.2% of Si, 3.5-5.5% of Mn, 0.3-2.8% of B, 0.3-2.1% of Cu, 0.2-0.5% of Ti, 0.05-0.25% of Ca, 0.03-0.3% of Ce, 0.02-0.18% of N, 0.05-0.3% of Nb, 0.04-0.09% of Al, 0.1-0.5% of SiMgRe, 0.04-0.13% of K, less than 0.03% of S, less than 0.04% of P and the balance of Fe and inevitable impurity elements. The preparation method comprises the following steps of: adding a copper plate, silicon iron and ferromanganese iron after steel scrap and chromium iron are melted; after the component adjustment before furnace is qualified, increasing the temperature of the melt to 1560-1620 DEG C, adding a calcium-silicon alloy and aluminum for deoxidation, and orderly adding ferrotitanium and ferroboron, melting, and then discharging; putting a composite inoculant composed of granular rare-earth magnesium alloy with granule size being less than 12mm, metal cerium, Si3N4, VN, Nb and K at the bottom of a steel ladle after baking, and performing inoculation treatment on the molten steel by a rush-into-ladle method, wherein the casting temperature of the molten steel ranges from 1400 DEG C to 1450 DEG C; preserving the heat of castings for 4-6 hours at 700-780 DEG C, and then carrying out subcritical air quenching to obtain the alloy steel.

The invention discloses a special flux-cored wire for surfacing repair of a BD roller, which consists of a tube skin and a flux core, wherein the tube skin is an H08A steel strip, and the flux core comprises the following components by weight percent: 15-25% of high-carbon ferrochrome, 2-10% of micro-carbon ferrochrome, 5-7% of metal manganese, 6-12% of ferromolybdenum, 3-10% of ferrotungsten, 5-10% of ferrovanadium, 0.5-6% of ferrotitanium, 0.3-5% of yttrium-based rare-earth, 1-3% of ferrocolumbium, 4-10% of cryolite and 10-50% of ferrous powder, wherein the filling coefficient is 30-45%. The special flux-cored wire selects a Cr-Mo-W-V alloy system with optimal alloy matching and carries out Ti-Nb-Re micro-alloy grain refinement, thereby leading a surfacing repair layer to have the advantages of high hardness, high wear resistance, high toughness and high anti-cold and hot alternating thermal fatigue performance, and exponentially prolonging the service life of the BD roller after surfacing repair in comparison with the BD roller after the ordinary roller flux-cored wire repair.

The invention relates to a wear-resistant overlaying flux-cored wire. The wear-resistant overlaying flux-cored wire comprises a low-carbon steel outer layer and a flux core inner layer, wherein the filling coefficient of a flux core is 45-55 percent, and the overlaying flux-cored wire is characterized in that the flux core comprises the following components in parts by weight: 1-6 parts of microcrystalline graphite, 1-4 parts of aluminum-magnesium alloy, 1-2 parts of fluoride, 1-2 parts of silicate, 1-3 parts of titanate, 1-2 parts of carbonate, 30-80 parts of high carbon ferro-chrome, 15-45 parts of metal chromium carbide, 5-10 parts of electrolytic chromium powder, 3-6 parts of high carbon ferromanganese, 1-4 parts of rare earth ferrosilicon, 2-6 parts of ferrosilicon, 4-10 parts of ferromolybdenum, 5-10 parts of ferrotungsten, 5-10 parts of ferrovanadium, 4-10 parts of ferrocolumbium, 4-10 parts of ferrotitanium and 1-4 parts of ferroboron. The wear-resistant overlaying flux-cored wire has the advantages of good hardness, wear resistance and anti-cracking performance.

The invention relates to a flux-cored wire for stainless steel welding, and particularly discloses the flux-cored wire for stainless steel welding. The flux-cored wire is composed of flux-cored powder and a stainless steel belt, wherein the flux-cored powder is wrapped by the stainless steel belt. The flux-cored wire for stainless steel welding is characterized in that the flux-cored powder accounts for15-25% of the total weight of the flux-cored wire, the flux-cored powder comprises, by weight, 30-38 parts of metal chromium powder, 6-15 parts of metal nickel powder, 3-10 parts of metal manganese powder, 20-35 parts of rutile, 1-6 parts of silicon iron, 1-7 parts of ferrotitanium, 2-10 parts of feldspar, 5-10 parts of quartz, 1-5 parts of rare earth fluoride, 1-5 parts of metal nitride powder and appropriate iron powder, and the total flux-cored powder is, by weight, 100 parts. A reduction jar of the flux-cored wire for welding is long in service cycle, and deposited metal formed by the flux-cored wire has the excellent effects of high temperature oxidation resistant capacity and high temperature sulphur corrosion resistant capacity.

The invention discloses an ultra-supercritical novel ferrite heat-resistant steel welding electrode, consisting of an H08Cr9WMo special core wire and a coating, wherein the content of each of sulfur, phosphorous, arsenic, stannum and the like in the H08Cr9WMo special core wire is low; the coating is wrapped on the surface of the core wire; and the covering components and the mass contents thereof are as follows: 28-40% of marble, 18-28% of fluorite, 5-10% of rutile, 3-8% of ferrotitanium, 4-10% of silica powder, 2-5% of silicoferrite, 1-1.8% of ferrovanadium, 0.4-0.8% of ferrocolumbium, 1-1.8% of nickel powder, 0.4-0.8% of sodium carbonate, 0.4-0.8% of CMC (Carboxymethyl Cellulose), 0.2-0.6% of amorphous graphite powder, 0.6-1.5% of ferrochrome nitride and 1.5-3% of electrolytic manganese. The welding electrode provided by the invention is used for the welding of ultra-supercritical heat-resistant steel T / P92 in a matching way; and in the course of welding, the electric arc is stable, the splashing is little, the slag detachability is good, the all-position operability is good, the formed welding line is attractive and the welding line wettability is moderate.

The invention discloses a low-temperature steel flux cored wire. Flux core of the flux cored wire comprises the following raw materials by weight percentage: 28 to 33 percent of rutile, 1 to 3 percent of aedelforsite, 14 to 18 percent of silicon-manganese alloy, 16 to 21 percent of ferrous powder, 2 to 4 percent of nickel powder, 1 to 2 percent of cryolite, 5 to 7 percent of feldspar, 1.5 to 2.5 percent of ferrotitanium, 0.5 to 1 percent of ferroboron, 5 to 6 percent of mid-carbon ferromanganese, 2.5 to 4 percent of magnesite, 4 to 6 percent of quartz and 1.5 to 3.5 percent of fluorite. Compared with the similar product of the prior art, the flux cored wire belongs to the meta-acid slag series, and has the advantages of good electric arc stability, less splash, easy slag removal, good low-temperature impact ductility, good low-temperature crack resisting performance, high efficiency and low cost.

A method for preparing high-quality high ferrotitanium based on aluminothermic reduction and a device thereof belong to the technical field of metallurgy. The method comprises the following steps: (1) preheating an aluminothermic reducing agent into a liquid state; and ball milling and baking a titanium-containing substance, an iron-containing substance and a slagging medium, and then continuously adding an obtained mixture to a molten metal bath to perform high-temperature smelting; (2) blowing a particle reducing agent to perform smelting; and (3) cooling, obtaining ingot, removing impurities and obtaining the high-quality high ferrotitanium. The device comprises a charging device and a smelting device; the charging device comprises a charging hopper and a charging tube; and the smelting device comprises a resistance furnace, a magnesite bottom socket, a heat-resistant steel tube, a refractory material and a magnesite lining. The method has the advantages of short process, low production cost, low energy consumption, high product quality and the like, and the device has the advantages of simple structure, convenient operation and good application prospect.

The invention provides a novel process for a formula of a slag-free flux-cored wire, and relates to a welding material. The manufacturing method adds the combination of molybdenum powder, nickel powder and rare earth silicon to a formula of raw materials, eliminates mineral powder in a common formula, and optimizes the proportion of various types of metal powder in the formula. According to the formula, the welding material comprises the following components: 4 to 8 parts of micro carbon ferrochromium, 12 to 18 parts of low carbon ferromanganese, 56 to 67 parts of iron powder, 2 to 6 parts of molybdenum powder, 0.1 to 0.4 part of ferroboron, 2 to 5 parts of rare earth silicon, 1 to 3 parts of ferrosilicon, 2 to 3 parts of ferrotitanium, 2 to 3 parts of sodium fluoride, 3 to 7 parts of ferroaluminum, 1 to 3 parts of aluminum to magnesium powder and 4 to 8 parts of nickel powder. The invention improves the toughness, strength and anti-fatigue performance of welding seams and thins welding-seam grains by adding the combination of molybdenum powder, nickel powder and rare earth silicon into the raw materials of the formula, eliminating the mineral powder in the common formula, and optimizing the proportion of various types of metal powder in the formula. Meanwhile, slagging on the surfaces of the welding seams is avoided, and welding efficiency is raised by 20 percent compared with slag-type processes.