65results about How to "Strong deoxygenation ability" patented technology

The invention discloses a blackening method for a lithium tantalite crystal substrate. According to the method, a fluoride material and the to-be-treated lithium tantalite crystal substrate are contacted sufficiently, and the lithium tantalite crystal substrate is subjected to reductive heat treatment at the temperature of 450-600 DEG C in non-oxidative reducing atmosphere for 5-24 h. The volume resistivity of the lithium tantalite crystal substrate after blackening is 10<9>-10<12> omega cm. The method has the advantages that the method is simple, reliable and easy to operate, and the obtained lithium tantalite crystal substrate has good resistivity repeatability and low cost and is applicable to batch production.

The invention provides a microalloying wear resisting ball and a preparation method and a preparation system thereof. The microalloying wear resisting ball comprises the following components in percentage by weight: 0.75-0.85% of C, 0.15-0.35% of Si, 0.65-0.75% of Mn, 0.4-0.5% of Cr, 0.05-0.1% of B, 0.01-0.05% of N, 0.01-0.015% of Mg, 0.05-0.15% of Ca, S not more than 0.010%, P not more than 0.015%, and the balance of Fe. The invention further discloses the preparation method of the microalloying wear resisting ball; and the preparation method comprises the steps of induction smelting-continuous casting and rolling of rods-medium-frequency induction heating-inclined rolling and rotary cutting of balls-heat treatment process (quenching+tempering). The microalloying wear resisting ball has the advantages of high strength, high toughness, simple production process and low cost.

The present invention present invention belongs to the field of steel-smelting technology. The Al-Fe alloy as deoxidizer is suitable for use in producing low-silicon degasified steel, converter No. 45 steel and pipe steel. The Al-Fe alloy as deoxidizer has the chemical components of Al 40-60 wt%, Fe 37-57 wt%, Mn 0.1-10 wt%, Si 0.1-8 wt%, Ti 0.1-10 wt%, C 0.1-1.0 wt%, P 0.001-0.1 wt% and S 0.001-0.1 wt%. It has high chalking resistance, high deoxidizing capacity, low cost, less ablation, high yield and high aluminum utilization, and can reduce bubble generated at most, fine steel structure crystal grain, raise the shock resistance of steel and lower cold brittleness and age tendency.

The invention discloses a method for welding molybdenum alloy, belonging to the technical field of metal welding. The method comprises the steps: (1) after cleaning, drying the welding area of molybdenum alloy; (2) manufacturing a special welding wire for the molybdenum alloy; (3) degassing at high temperature; (4) taking out a molybdenum alloy workpiece, spraying an active agent until the thickness is 0.2-0.8mm on the he welding area of molybdenum alloy, heating the special welding wire for the molybdenum alloy to dry, and then welding the molybdenum alloy workpiece, wherein the welding method adopts TIG wire filling welding, adopts a direct-current straight polarity power supply and determines welding process parameters; (5) cooling; (6) inspection. The method can reduce the quantity of joint holes, improve weldability, reduce cracks, refine parent crystalline grains so as to improve the tensile property of welded joints, and obtain good welding quality.

The invention discloses a refining process for producing spring steel through an electric furnace, and belongs to the technical field of steel smelting. The refining process comprises the steps of firstly, electric furnace smelting, wherein (a) steel scraps and molten iron are adopted as raw materials, (b) eccentric bottom tapping is adopted for preventing slag discharging, the refining rephosphorization quantity is smaller than or equal to 0.005%, the tapping temperature is 1620 DEG C or above, and (c) argon bottom blowing and stirring are carried out in the whole electric furnace tapping process; secondly, LF furnace smelting, wherein (a) lime, calcium carbide and silicon calcium barium are used for deoxidization and slagging in the early stage, and silicon carbide and calcium carbide are used for slag maintaining in the later stage, (b) components of refining slag are required to comprise 48%-55% of CaO, 23%-28% of SiO, smaller than 15% of Al2O3, 5%-8% of MgO and not larger than 0.8% of TFe+MnO; and thirdly, RH smelting. By means of the refining process, the components of the refining slag can be precisely controlled, and quartz sand does not need to be added for slag adjusting;meanwhile, stable control over the molten steel temperature and the components of the refining slag can be guaranteed through the manners of slag quantity control, stirring control, process slag maintaining and the like, and secondary oxidation of molten steel is reduced; and the deoxidization capacity of the refining slag is high, and the aims of deep deoxidization and deep desulfuration are achieved effectively.

The invention relates to a manganese-base vanadium-containing MnAlV alloy smelted by high-phosphorus manganese ores and a smelting method thereof. The MnAlV alloy comprises the following chemical components by mass percentage: 30%-50% of Mn, 20%-40% of Al, 10%-20% of Si, 1%-10% of V, not more than 0.08% of P and the balance of Fe and other impurity elements. The needed main raw materials for smelting the alloy comprise the high-phosphorus manganese ores, manganese-enriched residues, coke, blue coke, silica, ferrovanadium, pure aluminum as well as a corresponding dephosphorizing agent and a slag forming constituent. The smelting method comprises the following steps: according to the design requirements for alloy components, firstly weighing the needed raw materials based on per unit weightof alloy; smelting the raw materials into a silicon-manganese alloy mother liquid; dephosphorizing, alloying and casting; and finally cooling to obtain the MnAlV alloy. The manganese-base vanadium-containing MnAlV alloy smelted by the method has high aluminum content, high vanadium content and low phosphorus content; the alloy can be stored under various weather conditions and has a stale structure without chalking; and a crystal structure and a carbide shape of the alloy are improved so as to enhance steel performances such as yield strength, tensile strength, heat resistance and cold workability.

The invention relates to steel-covered aluminum-calcium alloy for steelmaking and a preparation method thereof. Aluminum and calcium are used to produce an aluminum-calcium alloy. The aluminum-calcium alloy contains 10 to 90 mass percent of aluminum and the balance of calcium and inevitable impurities. In addition, the aluminum-calcium alloy also contains 1 to 10 percent of one or two of magnesium and rare earth. The aluminum-calcium alloy is covered by a steel plate to form the steel-covered aluminum-calcium alloy. The steel-covered aluminum-calcium alloy has the advantages of high steelmaking deoxidizing capacity, small calcium melting loss, low production cost and better economic and social benefits.

The invention provides a Si-Ca-Mg-Fe alloy for deoxidizing molten steel, which comprises Si 40-60%, Ca 10-15%, Mg 1-10% and Fe is more than or equal to 40%, the remainders are unavoidable foreign matters. As the alloy contains more Fe, the specific weight is high, so the utilization rate of deoxidizing element is improved; and as the alloy contains Mg, the desulfurizing and deoxidizing capability is improved. The alloy can finally deoxidize molten steel so that the T[O] of molten steel can be steadily less than 20 ppm.

The invention provides an anti-corrosion and low-abrasion wear-resistant ball and a preparation method thereof. The anti-corrosion and low-abrasion wear-resistant ball comprises the following alloyingelements of 2.1-2.8% of carbon, 0.5-0.8% of silicon, 1.8-2.2% of manganese, 16-22% of chromium, 1.8-2.1% of nickel, 0.5-2% of molybdenum, 0.1-0.35% of vanadium, 1.3-2.6% of tantalum and the balance iron and unavoidable impurities. According to the anti-corrosion and low-abrasion wear-resistant ball and the preparation method thereof, through reasonable element matching and process optimization, the comprehensive mechanical properties of the prepared wear-resistant ball are high, excellent corrosion resistance and abrasion assistance are achieved, and the service life is prolonged by more than6 times compared with a traditional high-chromium wear-resistant ball.

The present invention relates to a steel-smelting deoxidant Si-Ba-Sr-Ca-Fe alloy, belonging to the field of steel-smelting technology. The composition of said alloy comprises (wt%) 30-60% of Si, 8-28% of Ba, 1-20% of Sr, 1-20% of Ca and the rest is Fe. As compared with existent technology it is strong in deoxidation, can thin crystal grains and raise steel quality.

The invention discloses a high-toughness wear-resistant flux-cored wire which consists of a flux core and stainless steel skin covering the flux core. The flux core comprises the following raw materials: graphite powder, silicon powder, magnesium powder, nickel powder, titanium powder, titanium dioxide powder, titanium boride powder, iron oxide powder, zirconium oxide powder, aluminum-strontium alloy powder, electrolytic manganese powder, ferromolybdenum powder, ferroniobium powder, ferrovanadium powder, rare earth ferroalloy powder, carbonate, metal fluoride, and the balance reduced iron powder and unavoidable impurities. The high-toughness wear-resistant flux-cored wire has the advantages that splashes are small, smoke is little, the forming is good, deslagging is easy, deposited metal is compact in structure, no pores or flaws appear, the high-toughness wear-resistant flux-cored wire is combined with parent metal well and is stable in performance, the deposited metal has good wear resistance, corrosion resistance and high toughness, and the high-toughness wear-resistant flux-cored wire has good economic benefits.