153 results about "Fe content" patented technology

The invention belongs to the technical field of aluminum alloy production, and particularly discloses a low-carbon environment-friendly method for producing a 3104 alloy blank with a high secondary aluminum proportion, which comprises the procedures of smelting, melt purification, online degassing filtration, continuous casting and triple continuous rolling, and is characterized in that alloy components are optimized, secondary aluminum waste is used in a large proportion, the Fe content is increased, and the production cost is reduced. Iron and elements such as manganese in the aluminum alloy form intermetallic compounds, the intermetallic compounds can serve as heterogeneous nucleation, obviously refine alloy grains during casting and increase Fe content, the performance of the 3104 alloy blank is improved, meanwhile, aluminum is replaced with iron, the main material cost can be reduced, in addition, due to the fact that the rolling temperature of an inlet of each rack is high, and meanwhile the finish rolling temperature is also high, the service life of the 3104 alloy blank is prolonged. The self-tempering effect is achieved, internal dislocation of materials is eliminated, the blank edge cracking condition is improved, strip breakage caused by the edge cracking problem in the subsequent rolling process is avoided, safe production is guaranteed, the main material cost is reduced, meanwhile, the blank performance is improved, the 3104 alloy blank is efficiently produced in a high-quality mode, and the purposes of low carbon and environment protection are achieved.

The invention provides a 6-series aluminum bar prepared from high-proportion recycled aluminum and a preparation method of the 6-series aluminum bar, and relates to the technical field of secondary aluminum preparation. Wherein the 6-series aluminum bar comprises the following components in percentage by mass: 0.6-1.2% of Mg; 0.5 to 0.9 percent of Si; cu: less than or equal to 0.3%; 0.25 to 0.42 percent of Mn; 0.25 to 0.35 percent of Fe; cr: less than or equal to 0.2%; zn: less than or equal to 0.2%; ti: less than or equal to 0.1%; other inevitable single impurity elements are less than or equal to 0.05%, and total impurity elements are less than or equal to 0.15%; the balance is Al; wherein the adding proportion of the secondary aluminum is larger than or equal to 50%; mn / Fe is greater than or equal to 0.9 and less than or equal to 1.1; and 0.4 < = (Si-Mg / 1.73) / Fe < = 0.6. Through component design and process optimization, the influence of the impurity element Fe content in the high-proportion secondary aluminum 6-series casting rod is compatible, the Fe content tolerance of the aluminum alloy is improved to 0.35%, and the performance of the aluminum alloy reaches the grade of primary aluminum.

The invention discloses an alloyed hot-dip galvanized steel sheet, a substrate of the alloyed hot-dip galvanized steel sheet contains 0-1.0% by mass of Si, the average Fe content in an alloyed hot-dip galvanized layer of the alloyed hot-dip galvanized steel sheet is 7-10% by mass, and the surface phase structure of the alloyed hot-dip galvanized layer contains a columnar zinc-iron alloy phase, the ratio R of the length to the width of the columnar zinc-iron alloy phase is greater than or equal to 2 and less than or equal to Rlt; 7. The pulverization grade of the alloyed hot-dip galvanized steel plate is smaller than or equal to 6 grade, and the pulverization resistance is good. The invention further discloses a manufacturing method of the alloyed hot-dip galvanized steel plate, the manufacturing method is suitable for the low-silicon steel plate, and the alloy phase structure of a steel plate coating is controlled by controlling the air-fuel ratio in the preheating stage in the continuous annealing step, the dew point DP in the soaking stage and the alloying temperature in the alloying step, so that the pulverization resistance of the steel plate is improved.

The invention provides an aluminum alloy material and a manufacturing method thereof, the aluminum alloy material is used for semiconductor equipment, the aluminum alloy material contains Al and inevitable impurities, and further contains the following chemical elements in percentage by mass: 0.5-0.7% of Si, 0.05-0.15% of Fe, 0.2-0.3% of Cu, less than or equal to 0.15% of Mn, 0.8-1.2% of Mg, 0.15-0.35% of Cr, and the balance of Al and inevitable impurities. Fe / Si is greater than or equal to 0.08 and less than or equal to 0.28, and Mg / Si is greater than 1.73 and less than 1.83. According to the aluminum alloy material, the mass percentage content of Fe is limited to be 0.05-0.15%, and Fe / Si is larger than or equal to 0.08 and smaller than or equal to 0.28, so that the Fe content and the Fe / Si ratio are controlled within a proper range, and the precipitation number of an AlFeSi phase in the casting process can be reduced on the basis of ensuring that the mechanical property is not lost.

The invention relates to the technical field of metal casting, and discloses a smelting and casting method of a high-toughness regenerated aluminum alloy, which comprises the following steps: measuring the iron content of a regenerated aluminum melt, regulating and controlling the manganese-iron ratio, heating the melt to 750-790 DEG C, and carrying out overheating treatment to eliminate a hereditary core; cooling to 630-645 DEG C, applying a mechanical shear flow field with the average shear rate not lower than 60s <-1 > in the interval, stripping a diffusion boundary layer on the surface of the iron-rich phase crystal nucleus by utilizing fluid drag force, breaking dendritic crystals, and separating out in a polyhedral or spherical manner; according to the method, through active intervention of a critical shear flow field, the problem of needle-like growth of an iron-rich phase caused by solute diffusion blocking in a traditional technology is solved, in-situ generation of the harmless iron-rich phase in the high-iron-content secondary aluminum is achieved, the obdurability of a die casting is improved, and dependence on the purity of raw materials is reduced.

The invention discloses a preparation method of an aluminum-iron alloy based on recycled waste. The method comprises the steps that S1, regenerated waste aluminum, regenerated waste iron and a grain refiner are put into a rotary furnace to be treated; s2, the pretreated raw materials are put into an alloying furnace to be refined; s3, the molten aluminum-iron alloy refined through the alloying furnace is cast into an alloy ingot with the required specification through casting equipment, the temperature of the molten alloy is monitored in real time through a temperature sensor in the casting process, and it is ensured that the temperature is stabilized at 740-750 DEG C; and S4, a robot is adopted for automatic unloading, high-temperature stacking and packaging. The duplex process of rotary furnace pretreatment and alloy furnace gradient refining is adopted, and industrial verification shows that the fluctuation range of the alloy component content in the prepared aluminum-iron alloy is decreased, and the Fe content is controlled to be + / -0.8%; the elongation of the product is improved by 12%; the yield of the iron element is increased to 94.5%, and the energy consumption is reduced to 680kWh / ton; the cost is greatly reduced, the cost per ton is reduced by 1350 yuan, and the use ratio of the regenerated material is 97%; and the production period is shortened to 4.2 hours per furnace.

The invention discloses a high-Fe-content and high-comprehensive-performance aluminum alloy and a preparation method thereof.The specific method comprises the following steps that firstly, reasonable smelting and refining processes are adopted, three different modifiers are added to conduct Fe phase modification treatment on waste aluminum materials, and the existence form of the Fe element is controlled; and carrying out homogenization heat treatment and deformation heat treatment to obtain the high-temperature-resistant alloy. Through alloy component design and machining process optimization, the characteristics of morphology, distribution and the like of the Fe-rich phase are changed, phase change of the Fe-containing phase is achieved, the interface behavior of the Fe-containing phase is regulated and controlled, then accurate control over the microstructure of the high-Fe-content aluminum alloy is achieved, and high comprehensive performance is obtained. The high-Fe-content 6XXX series aluminum alloy prepared through the method has excellent mechanical performance and corrosion resistance, the application requirement of the high-quality 6XXX series aluminum alloy can be met, and a new way is provided for high-value utilization of secondary aluminum.

The invention discloses a method for efficiently removing iron from a regenerated Al-Si alloy, which is characterized in that by controlling the content of Si, the mass percent of the Si is in a range of 10.0-12.6%, the heat preservation temperature of iron removal is reduced, the sedimentation efficiency of an iron-rich phase is improved, the mass ratio of (Mn + Cr) / Fe is controlled to be 0.5-1.0, the proportion of components and the sedimentation temperature are optimized, and the iron removal efficiency is improved. And the iron removal efficiency and the production efficiency are further improved. Besides, secondary aluminum with high Fe content is added through a step-by-step method, an electromagnetic stirring system is combined, melting of the secondary aluminum with high content is effectively accelerated, the production efficiency is improved, the Al-Sr-RE composite alterant with a specific proportion is added, sedimentation of an iron-rich phase can be further accelerated, the iron removal rate and the production efficiency are improved, and a subsequent refining agent with a specific proportion is combined, so that the iron removal efficiency is improved. And castings or regenerated aluminum alloy ingots with few impurities and excellent mechanical properties are obtained, the balance of the iron removal rate and the production efficiency is achieved on the whole, and the comprehensive performance of the regenerated aluminum alloy is remarkably improved.

The application discloses a low-ash-consumption converter smelting method, adopts single-slag smelting, controls the converter scrap steel ratio in 8% to 26%, controls the top blowing oxygen supply flow in 3.0 to 4.0 Nm 3 / (min·t), controls the bottom blowing argon flow in 0.03 to 0.10 Nm 3 / (min·t); the smelting process is improved by the cooperation of the gun position and the charging; the solid waste slag is added in the converter blowing process, the content of CaO in the slag is controlled in 45% to 55%, and the content of MgO is controlled in 5.5% to 7.5%; meanwhile, the dust removal pressure ball is added to improve the activity of FeO in the slag, and the terminal carbon content of the converter is controlled to be less than or equal to 0.05%. By adding the solid waste slag in the smelting process, the slag needed to oxidize a large amount of iron elements to generate FeO is reduced, so that the total iron content of the slag is reduced; by adding the synthetic slag, the liquidity of the slag is ensured, and the carbon-oxygen reaction is promoted; the total iron content of the low-carbon steel converter terminal slag is stably controlled to be less than 14.5%, the metal yield is provided; the lime addition amount can be reduced, the lime addition amount is controlled to be less than or equal to 10 kg / t, and the cost is reduced.

The invention relates to the field of aluminum alloy material processing, in particular to a high-strength corrosion-resistant marine aluminum alloy profile and a preparation method of the high-strength corrosion-resistant marine aluminum alloy profile. The content of Fe is 0.24 to 0.26 percent; the content of Cu is 0.05 to 0.15 percent; the content of Mn is 0.6 to 0.8 percent; the content of Mg is 4.7 to 4.9 percent; the content of Cr is 0.05 to 0.25 percent; the content of Zn is 0.15 to 0.25 percent; the content of Zr is 0.05 to 0.12 percent; the content of Ti is 0.01 to 0.012 percent; the content of B is 0.001-0.0025%, and the single content of other impurity elements is less than or equal to 0.05%; the total content of other impurity elements is less than or equal to 0.15%; the balance is Al; the weight percentage ratio of Ti to B is (5.2-5.7): 1, the weight percentage ratio of Zr to B is (22-55): 1, and the aluminum alloy profile for ships has high strength and high corrosion resistance and meets the development requirements of the ship industry.

The present invention provides a method for producing a sintered ore, with which it is possible to improve granulation properties of a sintering starting material even in cases where PKS charcoal is mixed with the sintering starting material in order to reduce the discharge amount of carbon dioxide, and ore concentrate is mixed with the sintering starting material in order to increase the total Fe amount.　The method for producing a sintered ore comprises: a starting material blending step (step S101) for blending and granulating an iron starting material and a solid carbonaceous material that contains a first carbonaceous material and a second carbonaceous material so as to produce a sintering starting material; a starting material layer formation step (step S102) for supplying the sintering starting material onto a pallet of a sintering machine so as to form a starting material layer; and a sintering step (step S103) for igniting and firing the upper surface of the starting material layer so as to produce a sintered ore. In the starting material blending step (step S101), palm shell charcoal is blended as the first carbonaceous material, and a carbonaceous material derived from a fossil fuel is blended as the second carbonaceous material. The arithmetic average particle diameter of the palm shell charcoal is smaller than the arithmetic average particle diameter of the second carbonaceous material.

This invention relates to the field of aluminum alloy materials technology, specifically to a low-zinc-content 6-series aluminum alloy sheet and its manufacturing method. The components and their weight percentages in the low-zinc-content 6-series aluminum alloy sheet are as follows: Si content 0.90-1.20%, Mg content 0.45-0.65%, Cu content 0.12-0.20%, Zn content 0.05-0.10%, Fe content ≤0.28%, Mn content 0.02-0.20%, Cr content ≤0.10%, Ti content ≤0.15%, containing at least one of In, Cd, La, and Ce, and the total content of In, Cd, La, and Ce is 0.01-0.10%; the content of a single impurity ≤0.03%; the total content of other impurity elements ≤0.1%; and the balance is Al. This 6-series aluminum alloy sheet, with a low zinc content (Zn ≤0.10%), possesses excellent formability, high bake hardening value, and high batch stability.

The invention relates to the technical field of metal materials, in particular to a 5-series aluminum alloy plate with low-temperature baking hardening response and a preparation method of the 5-series aluminum alloy plate. The content of Zn is 1.5%-3.5%; the content of Cu is 0.3%-1.2%; the content of Mn is 0.1 to 0.3 percent; the content of Cr is 0.03 to 0.15 percent; the content of Zr is 0.05 to 0.15 percent; the content of Ti is 0.01 to 0.10 percent; si content is less than or equal to 0.2%; fe content is less than or equal to 0.25%; the La content is less than or equal to 0.2%; the Ce content is less than or equal to 0.2%; the content of Yb is less than or equal to 0.2%; the balance is Al; the bake hardening response efficiency function phi BH of the 5-series aluminum alloy plate is 0.15-1.2; the steel plate has low yield strength, high elongation, high formability and high sinking resistance, and baking varnish hardening is guaranteed.

The invention discloses a steel plate, a hot stamping part and a preparation method and application thereof, and belongs to the technical field of alloy materials, the hot stamping part comprises an oxide layer, an alloy layer and a steel matrix, and the alloy layer is located between the oxide layer and the steel matrix; in the alloy layer, the phase proportion of the phase with the Fe content of 45 wt.%-95 wt.% is larger than or equal to 80%, and the occurrence frequency of the coincidence lattice grain boundary sigma 3 of the phase with the Fe content of 45 wt.%-95 wt.% is larger than or equal to 1%. In addition, the invention further discloses a steel plate component and a preparation method of the hot stamping part and a hot forming process of the hot stamping part. According to the method, the LME resistance of the Fe content in the alloy layer is improved, meanwhile, the crystal configuration of the plating layer is regulated and controlled, the frequency of the coincidence lattice grain boundary sigma 3 of the phase with the Fe content of 45 wt.%-95 wt.% in the zinc-iron alloy layer is improved, and the corrosion resistance of a hot forming part is considered while the LME resistance is achieved by means of the good intergranular corrosion resistance of the coincidence lattice structure.

The invention discloses a molten aluminum refining production process capable of reducing the iron element content, and relates to the technical field of secondary aluminum refining. The process is combined with the characteristics of existing secondary aluminum refining equipment and process, and comprises the steps of pretreatment in a smelting furnace, refining in a holding furnace, online rotor refining and ceramic filtration, and multi-stage iron removal is realized by comprehensively applying a flux method, a gravity settling method and a ceramic filtration method. The iron removal flux and inert gas are blown through the rotor, the iron removal reaction is accelerated, the single-process iron removal effect and production efficiency are improved, and the flux consumption is reduced. The iron removal efficiency is stabilized at 62% or above, the iron content in the secondary aluminum is effectively reduced, the product quality is improved, and the method is suitable for industrial production.

The invention discloses a powder metallurgy near-net forming method for a high-purity iron TD4 thin-wall complex component, which belongs to the field of powder metallurgy and comprises the following steps of: 1, activating spherical TD4 iron powder with the Fe content of more than or equal to 99.8 percent and the particle size of 15-45 microns by using low-temperature plasma with the power of 100-300W for 5-15 minutes under the protection of argon; 2, the isostatic pressing graphite die is filled in a vibration mode, a cavity is compensated through the shrinkage rate of 1.2%-2.5%, and a functional gradient punch with a slightly-convex curved surface is arranged; 3, electric field activation pressure auxiliary sintering is conducted, real-time monitoring is conducted through a high-speed camera larger than or equal to 100 fps and a pyrometer, and AI dynamically regulates and controls current and pressure according to curvature variation and the like; and 4, high-purity argon is forcibly cooled at the speed of 50-100 DEG C / min under the pressure maintaining condition, sand blasting and chemical polishing are conducted after demolding, the density and size precision of the component are improved through the method, the thin wall cracking risk is reduced, and the requirement of the high-end field is met.

The invention relates to a Fe-based nanocrystalline alloy material and a preparation method and application thereof, and belongs to the technical field of nanocrystalline alloy materials. The invention provides a Fe-based nanocrystalline alloy material, the atomic percentage expression of the Fe-based nanocrystalline alloy material is FexGdyBz, x is the atomic content corresponding to the Fe element, and x is greater than or equal to 82 and less than or equal to 87; y is the atom content corresponding to the Gd element, and 0.5 < = y < = 3; z is the atom content corresponding to the element B, and z is greater than or equal to 12 and less than or equal to 16; x + y + z is equal to 100. After the Gd element is added, the coercive force of the Fe-based nanocrystalline alloy material can be further reduced, the saturation magnetization of the Fe-based nanocrystalline alloy material is improved, and the Fe-based nanocrystalline alloy material with excellent soft magnetic performance and high iron content is obtained. It is found that the contents of Fe, Gd and B elements have a certain relation, and under the specific contents, the soft magnetic performance of the Fe-based nanocrystalline alloy material can be improved.

The invention relates to a magnetic material comprising at least iron, in metal form and / or in oxide form, and at least one clay matrix, the iron content being between 15% and 70% by weight of iron element relative to the total weight of said material, characterized in that said material has a specific surface area greater than 1 m² / g and less than 50 m² / g, and said material is in the form of beads or extrudates, and in that said material comprises at most 25% by weight of hematite relative to the total weight of said material.

The invention relates to the technical field of vanadium metallurgy, and discloses a vanadium slag cooling and tapping technological process which comprises the following steps: turning vanadium slag obtained after steelmaking and vanadium extraction into a tank; preliminarily controlling the size and the temperature of the vanadium slag after tank turning; the vanadium slag is filtered in a magnetic separation mode; the filtered vanadium slag is controlled again, and the particle size and the magnetic iron content of the vanadium slag are determined; and roasting the vanadium slag. According to the scheme, the vanadium slag is turned over, the natural cooling time of the vanadium slag in the tank is shortened, and therefore a large amount of vanadium slag is prevented from caking, that is, the situation that slag is included in iron and iron is wrapped in slag in the vanadium slag is effectively avoided, the probability that the vanadium slag is inexhaustible is reduced, and a foundation is provided for follow-up screening of the iron content in the vanadium slag. And the content of magnetic iron in the vanadium slag is further reduced through subsequent multi-stage control and filtration of the vanadium slag, so that the conditions of frequent iron clamping and scratching of a conveying belt are avoided, the production efficiency is improved, and the equipment loss and the failure rate are reduced.

The invention relates to the field of aluminum alloy for ships, in particular to a 5-series aluminum alloy profile for ships and a preparation method of the 5-series aluminum alloy profile for ships. The Fe content is less than or equal to 0.15%; the content of Cu is less than or equal to 0.10%; the content of Mn is 0.6 to 0.8 percent; the content of Mg is 4.7 to 4.9 percent; the content of Cr is 0.05 to 0.25 percent; the Zn content is less than or equal to 0.20%; the content of Ti is less than or equal to 0.15%; the content of B is 0.0005 to 0.003 percent; the single content of other impurity elements is less than or equal to 0.05%; the aluminum alloy profile has excellent mechanical properties, low metal flow difference, stable performance uniformity and excellent strong plasticity and corrosion resistance, the longitudinal bending degree is smaller than or equal to 1.5 mm / m, and the longitudinal torsion degree is smaller than or equal to 1.0 mm / m.

This invention provides a comprehensive carbon blending control system and method for sintering. The system includes a batching detection unit, a mixture detection unit, a sintering process detection unit, an FeO detection unit, and a main control unit. The method monitors multi-dimensional parameters in real time and establishes a multi-dimensional dynamic coupling correction strategy for influencing factors such as total Fe content, moisture, particle size, material layer thickness, and sintering endpoint temperature. Combined with intelligent algorithm prediction, dual-closed-loop collaborative control, and precise compensation of feed rate, the method achieves quantitative output of solid fuel feed rate through a comprehensive calculation formula. This invention achieves dynamic optimization and precise control of carbon blending, stabilizes the FeO content of sintered ore, improves sintered ore quality and blast furnace smelting efficiency, balances energy consumption optimization and cost control, and enhances the automation and intelligence level of sintering carbon blending control.

This invention discloses an aerospace aluminum rod with good ductility and low impurity content, and its preparation method, belonging to the field of metal material processing technology. The aerospace aluminum rod has an aluminum content ≥99.5%, an iron content of 0.20%-0.25%, a silicon content ≤0.04%, and a hydrogen content ≤0.22 ml / 100g Al. By precisely controlling the Fe content within the preferred range of 0.20%-0.25%, combined with multi-stage refining and purification, precise temperature-controlled casting, and surface quality control, this invention significantly reduces the impurity content of the aluminum rod, refines the grain structure, and improves its machinability and ductility. It achieves excellent processing performance, producing 200,000 meters of continuous 0.361mm ultrafine single wire without breakage, making it suitable for the large-scale production of high-end aluminum alloy wire bundles in photovoltaic, new energy vehicle, and other fields.

This application discloses a tank body processing technology and cleaning device, belonging to the technical field of storage and transportation equipment. The process includes an anti-corrosion process, a welding process, an anti-corrosion process, and a heat treatment process. The heat treatment process includes four steps: preheating, heating, constant temperature, and cooling. It can effectively diffuse the iron in the tank body and the zinc in the galvanized coating, forming a zinc-iron alloy phase layer on the coated steel plate, thereby increasing the iron content on the coating surface. As a result, the inner wall of the tank body has better corrosion resistance, welding performance, coating performance, and resistance to sand and gravel impact. The tank body processing technology of this application solves the problem of poor anti-corrosion effect caused by poor quality galvanized coating.

The invention relates to a magnetic material comprising at least iron, in metal form and / or in oxide form, and at least one alumina oxide matrix, the iron content being between 15% and 70% by weight of iron element relative to the total weight of said material, characterized in that said material has a specific surface area greater than 50 m² / g and less than 300 m² / g, and said material is in the form of beads or extrudates, and in that said material comprises at most 25% by weight of hematite relative to the total weight of said material.

The present invention relates to a method of manufacturing a high strength and high thermal conductivity iron-based alloy additive manufactured body using a laser-powder bed melt object, the method comprising: using an iron-based alloy powder having an Ms point above 220 DEG C, a C content of 0.40 mass% or less, a Cr content of 7 mass% or less, an Fe content of 90 mass% or more; when the energy density per unit area EA is defined as EA = P / (v * sigma), the laser is manufactured at a laser power P (W), a scanning speed v (mm / s), and a laser spot diameter sigma (mm) under the condition that the energy density per unit area EA is 3 J / mm2 or more.

The invention relates to a process pipeline welding construction management method and system, and the method comprises the steps: calculating the mean value of the iron oxide content of to-be-welded pipeline batches according to the number of pipelines and the iron oxide content of the surface of each to-be-welded pipeline; the protective gas concentration is detected and input into a welding model, and the welding model is constructed based on historical welding data and used for predicting the preset iron oxide content under the given protective gas concentration; based on the relative deviation percentage between the iron oxide content mean value and the preset iron oxide content, the difference value of the to-be-welded pipeline batches is taken; according to the difference value, initial welding energy and initial welding interval time of the welding equipment are set; dynamically adjusting the welding interval time according to the real-time concentration of the protective gas; and according to the adjusted welding interval time, the welding energy corresponding to each welding interval time is determined. Through fusion of a plurality of parameter characteristics, coordination of mutual relations among parameters, intelligent decision making and dynamic control of the welding process, the welding quality is remarkably improved.

The present invention is characterized by having: a composition having a Fe content in the range of 0.08-0.17 mass% and a P content in the range of 0.025-0.06 mass%, with the remainder being Cu and unavoidable impurities; a conductivity of 75% IACS or greater and a Vickers surface hardness of 130 HV or greater at room temperature; and a Vickers surface hardness of 40 HV or greater at 400°C.

Disclosed in the present invention is an alloyed hot-dip galvanized steel plate. A substrate of the alloyed hot-dip galvanized steel plate contains 0-1.0% by mass of Si. The average Fe content in an alloyed hot-dip galvanized layer of the alloyed hot-dip galvanized steel plate is 10-12% by mass. A surface phase structure composition of the alloyed hot-dip galvanized layer contains a polygonal zinc-iron alloy phase, and the length-to-width ratio R of the polygonal zinc-iron alloy phase satisfies: 1≤R<2. The alloyed hot-dip galvanized steel plate of the present invention has good deep-drawing performance. Further disclosed in the present invention is a manufacturing method for the alloyed hot-dip galvanized steel plate, which method is applicable to a low-silicon steel plate. By controlling the air-fuel ratio in a preheating stage and the dew point (DP) in a uniform heating stage in a continuous annealing step and the alloying temperature in an alloying step, the alloy phase structure of the steel plate coating is controlled, so as to improve the deep-drawing performance of the steel plate.

To provide a method for suppressing red heat embrittlement cracking in the production of a steel containing Cu and Ni, particularly in a hot rolling stage, and also suppressing the generation of scale indentation flaws caused by the degradation in descaling properties.SOLUTION: A method for suppressing red heat embrittlement cracking and scale indentation when producing a steel containing Cu and Ni, the Cu-containing steel having a Cu equivalence CCuEq (mass%) of a base metal of 0.15% or more and 3.00% or less and a Ni concentration CNi (mass%) of 0.05% or more and half or less of the Cu equivalence CCuEq (mass%), the method comprising: mixing a Si-containing material having a Si amount per surface area of the steel of 200 to 1200g / m2 with an iron oxide or iron hydroxide having a Fe amount of 0.3 to 20.0% of the Si amount to obtain a mixture; The mixture is disposed on a steel material surface of the steel material, the steel material is heated in a temperature range of 1170 °C or higher, descaling is performed, and then hot rolling is performed.SELECTED DRAWING: None

Disclosed are aluminum alloys with high iron content and methods of making and using.