35results about How to "Effective deoxygenation" patented technology

The invention provides a modification method of biomass pyrolysis oil. The modification method of the biomass pyrolysis oil specifically comprises the following steps of: I, demulsification layering dehydration: adding an inorganic salt iron and an organic demulsifier into the biomass pyrolysis oil, wherein the mass ratio of the inorganic salt to the biomass pyrolysis oil is (1:2000)-(1:800), the mass ratio of the organic demulsifier to the biomass pyrolysis oil is (1:4000)-(1:1000), mixing completely, standing and taking an upper-layer biomass pyrolysis oil; II, carrying out catalytic cracking modification on the biomass pyrolysis oil: using a modified catalyst: (1) modified catalyst: carrying out ageing treatment on a zeolite molecular sieve load carclazyte catalyst for 2-8 hours with 100% water vapor at 500-800 DEG C; placing the aged catalyst in a reactor, injecting the biomass pyrolysis oil in a reactor with the catalyst, wherein the agent-oil ratio is 1:(3-16), and carrying out biomass pyrolysis oil catalytic cracking modification at the mass airspeed of 6-15h<1>, the reaction temperature of 380-700 DEG C and the reaction pressure of 0.1Mpa-0.8Mpa.

The process of producing Zn-Cu-Ni alloy strip includes the steps of casting, face milling, rought rolling, intermediate annealing, rinsing, intermediate rolling, edge trimming, intermediate annealing, finish rolling, defatting and rinsing, annealing, straightening, surface treatment, etc. The annealing step increased between the defatting and rinsing step and the straightening step is to maintain in 30-75 vol% hydrogen atmosphere at 350-420 deg.c for 6-9 hr, and can form one protecting film layer on the surface of the strip and raise the heat resisting performance from 180 deg.c to 250 deg.c. In addition, sorting proper defatting agent and concentration can further raise the heat resisting performance of the material.

The invention relates to a pollution-free molten slag deoxidization method capable of adjusting anode oxygen partial pressure and a device thereof, and belongs to the technical field of metallurgical refining process. In the method, molten steel or molten metal is deoxidized and purified by the special device. In the method, the molten slag is taken as electrolyte, a deaeration cavity electrode inserted into the molten slag is taken as an anode, and the molten steel or the molten metal is taken as a cathode; the deaeration electrode is provided with an electrode cavity and is communicated with a vacuum chamber by a conduit; an applied DC power supply exerts direct current impulse voltage so that an electric field is formed between the molten steel or the molten metal and an oxygen electrode of the molten slag, and the conduction of oxygen ions in a molten slag system and mass transfer of dissolved oxygen in the molten steel are controlled by controlling a current value and a voltage value of the DC power supply as well as components of the molten slag. The oxygen is diffused from the molten slag to the electrode cavity and discharged by an air exhaust system by controlling the oxygen partial pressure of the electrode cavity.

This application relates to the field of welding materials, and specifically discloses a strong and tough flux-cored welding wire and a preparation method thereof. The tough and tough flux-cored welding wire includes a welding wire coating layer and a welding wire flux core composition, and the welding wire coating layer is provided with An accommodating cavity penetrating along its length, the accommodating cavity is provided with a welding wire flux core composition, and the welding wire flux core composition includes the following components by weight: 45-58 parts of ferrochrome, 6-10 parts of ferromanganese, 10 parts by weight ~15 parts of ferrosilicon, 6~8 parts of ferromolybdenum, 1~3 parts of graphite and 1~2 parts of additives; this application screens the components inside the flux cored wire and optimizes the ratio of each component to improve the The structure of the powder filled inside the cored wire can effectively remove the sulfur in the welding alloy through the compounding and addition of ferrosilicon and ferromanganese, and then improve the welding process and add carbon to the surfacing alloy to form various alloys The carbide hard phase strengthens the toughness and wear resistance of the surfacing alloy matrix.

The present application relates to the field of metallurgy technology, in particular, to a Cr-Ni austenitic heat-resistant steel with endogenously precipitated reinforcing phase and a preparation method thereof. Using TiC and / or TiB 2 The particle-reinforced Cr-Ni austenitic heat-resistant steel has a metal and ceramic two-phase structure, which can improve the mechanical properties of the heat-resistant steel. At the same time, since TiC and / or TiB 2 The "reactive particle effect" brought about greatly improves the high temperature oxidation resistance of heat-resistant steel. In the heat-resistant steel, the volume fraction of the endogenous precipitated reinforcing phase is 1.2-15.9%, which can ensure the uniform dispersion and distribution of ceramic particles in the Cr-Ni series austenitic heat-resistant steel matrix, so that at a lower Cr content Under the premise, the high temperature oxidation resistance of Cr-Ni austenitic heat-resistant steel is greatly improved.

The invention discloses a novel composite modifier for austenitic manganese steel, comprising rare earth alloy, ferrotitanium, calcium silicon and aluminum, wherein the dosage of the Re-containing rare earth alloy accounts for 0.20-0.25 percent of the weight of molten steel; the dosage of the ferrotitanium accounts for 0.02-0.03 percent of the weight of the molten steel; the dosage of the calciumsilicon accounts for 0.20-0.25 percent of the weight of the molten steel; and the dosage of the aluminum accounts for 0.15-0.20 percent of the weight of the molten steel. Treatment inside a furnace is carried out in the alloying adjustment stage for the composition of the molten steel after ferromanganese is added for the fine adjustment of the manganese content of the molten steel; one third of the rare earth alloy is added to a molten pool, and the aluminum is added before the tapping of the molten steel. Treatment outside the furnace is to add the calcium silicon, two thirds of the rare earth alloy and the ferrotitanium to a steel ladle. The adoption of the Re-Ca-Ti-Al multi-element composite modifier prolongs the effective time of the modification process of the molten steel and guarantees good modification effect.

The invention discloses a compound-rare-earth-element-containing flux-cored wire suitable for 1000MPa-grade ultrahigh-strength steel welding. The compound-rare-earth-element-containing flux-cored wiresuitable for 1000MPa-grade ultrahigh-strength steel welding is composed of a flux core and a low-carbon steel strip wrapped on the outer side of the flux core. The flux core comprises, by mass percentage, 0.2% -0.9% of C, 0.2% -0.45% of Si, 1.2% -2.0% of Mn, 0.8% -2.5% of Cr, 2.0% - 5.5% of Ni, 0.35% -1.0% of Mo, 0.2% - 0.8% of Ti, 0.05% - 0.25% of Zr, 0.01% -0.09% of La, 0.01% -0.09% of Ce, 0.002% - 0.09% of Pr, 0.01%- 0.09% of Er, 0.01%-0.09% of Y, 0.005%-0.045% of Sc and the balance iron. The flux-cored wire can fully meet the high tenacity matching requirement of ultra-high-strength steeland has excellent welding process properties and mechanical properties.

The invention discloses a high-strength and high-conductivity heat-resistant Cu-Fe-Y-Mg alloy material with electromagnetic wave shielding performance and a preparation method thereof, and the copperalloy comprises Cu, Fe, Mg and Y elements; and the mass percentage of Fe is greater than or equal to 5% and is smaller than the mass percentage of Cu, and the Fe is uniformly distributed in the alloymaterial. The copper alloy uses a large amount of inexpensive iron element in the composition design; due to the immiscibility of copper and iron in the molten state, the starting alloy is mainly copper in the smelting process, a small amount of iron is added for melting, and after melting, Cu-Fe master alloy is added in a master alloy manner, alloy elements yttrium and magnesium are jointly addedin the smelting, which acts as a modificator and promotes the uniform distribution of the iron phase in the copper matrix in the solidified state, so that the alloy product finally has uniform properties, electromagnetic wave shielding performance and high strength and high thermal conductivity. The copper alloy material is suitable for non-vacuum large-scale industrial manufacturing.

The invention discloses a hydrogen plasma deoxidation method for chromium powder. The hydrogen plasma deoxidation method is characterized by comprising the following steps: selecting a metal chromium block and crushing the metal chromium block into chromium powder of -325 to -1340 mesh; carrying out hydrogen plasma deoxidation on the chromium powder, wherein the deoxidation is carried out in a stainless steel container with radio-frequency hydrogen plasma equipment, the radio-frequency hydrogen plasma equipment takes hydrogen gas as a working gas, and a slotted water-cooling copper furnace is arranged in the stainless steel container; firstly, manufacturing the chromium powder subjected to ball grinding into a plurality of chromium powder rod bodies, each of which having a diameter of 15-20mm and a length of 20-3mm, preparing a plurality of chromium powder rod bodies from chromium powder subjected to ball grinding by arc melting in the presence of argon gas at 0.02-0.05Mpa, and then connecting every two chromium powder rod bodies end to end and placing on the slotted water-cooling copper furnace; feeding gas through the radio-frequency hydrogen plasma equipment; manufacturing chromium rods in an once forming manner through a zone-melting method so as to finish deoxidation. The hydrogen plasma deoxidation method is used for carrying out chromium powder deoxidation by using the radio-frequency plasma equipment and is simple in process and low in cost, and the oxygen content of the product can accord with using requirements.

The invention discloses a kind of high manganese and low carbon composition alloy and the preparation method of it, the composition alloy contain the percentage by weight component as follow: Mn 70~75, Si 11~17, Al 7~14, P<0.2, C<0.3, S<0.03,surplus is Fe. The invention of composition alloy component proportioning science and rational, specific weight controlling strict, the method can deoxidize efficient for liquid steel, remove the foreign substance in liquid steel and deoxidize rapidly, make the steel slag easily floated upward and removed to obtain high degree of purity liquid steel, the composition alloy can be used as deoxidant in smelting kinds of steel, especially suitable for smelting conduit wiring steel, bridge and canal steel and high-strength ship plate steel that need strength deoxidation capacity, the composition alloy can reach high deoxidation effect.

The invention belongs to the technical field of metallurgy and particularly relates to a method for smelting a titaniferous austenitic stainless steel plate; and by means of the method, the defect that the surface of the titaniferous austenitic stainless steel plate has foreign matter is overcome. The technology includes the processes of electric furnace smelting, AOD furnace decarbonization, denitrifying and reduction and deoxygenation, LF furnace deoxygenation, calcium treatment, slagging off, titanium alloying, composition fine-adjustment and temperature adjusting, weak blowing and sedation and casting protection. By means of the method, carbon and nitrogen are lowered to a certain degree through AOD refining, reduction is conducted till deoxygenation is completed, and nitrogen increase and oxygen increase in the tapping process are controlled; the deoxygenation process is used when a LF furnace draws up at a station, increased oxygen in the AOD tapping process is removed effectively, and the yield of steel is increased and stabilized, generation of oxide of titan in steel is lowered as well; calcium treatment is adopted after deoxygenation, and a deoxygenation product is modified, comes up and is removed; the stirring intensity needs to be controlled in the whole LF operation process, and molten steel nitrogen increase and secondary oxidation are prevented; and meanwhile, the alkalinity of slag and the SiO2 content in the slag are controlled, the weak blowing time is prolonged, the sedation time is prolonged, rejects generated in production are lowered effectively, cost is lowered, and the product quality is improved.