69 results about "Annealing (metallurgy)" patented technology

The invention belongs to the metallurgy field and relates to a production process of a steel wire rod, particularly the steel wire rod for an annealing-free solder wire and a production process of the steel wire rod, wherein the steel wire rod comprises elements in weight percentage as follows: 0.07-0.1% of C, 1.25-1.4% of Mn, 0.4-0.6% of Si, less than or equal to 0.02% of P, less than or equal to 0.02% of S, 0.2-0.55% of Mo, 0.5-1.0% of Ni, less than or equal to 0.2% of Cu, less than or equal to 0.2% of Ti and less than or equal to 0.1% of Al with the balance of Fe. The process comprises steps of detecting a blank, heating the steel blank, descaling by high-pressure water, roughly and intermediately rolling, pre-finishing rolling, cooling in a first section by water, finishing rolling bya unit, cooling in a second section by water, diameter reducing and sizing rolling, cooling in a third section by water, spinning, cooling by wind, finishing and delivering to a warehouse. The methodof the invention employs a rolling-controlled and cooling-controlled process to execute process control of the steel wire rod of the solder wire to obtain an F+P tissue appropriate to draw, and has advantages as follows: good comprehensive mechanical property is realized, a solder wire factory can avoid annealing and perform multi-pass drawing without wire breakage, the production efficiency is greatly increased and the production cost is reduced at the same time.

The invention discloses a preparation method of a graphitizing hot rolled steel plate, which belongs to the technical field of metallurgy. The method mainly comprises the steps of steelmaking, refining, continuous casting, heating, hot continuous rolling, laminar cooling, coiling, steel coil spreading and air cooling, leveling and rolling, graphitizing annealing and the like. In order to increase the graphitizing rate and promote a graphitizing process, a pulsed magnet field is applied in a graphitizing annealing process, the magnetic field intensity is 10000 to 30000 A/m, and the magnetic field frequency is 20 to 100 Hz. Within the graphitizing time of 3 to 6 hours, the graphitizing rate can reach more than 90%, the diameter of graphite is 3 to 6 mum, the graphite is spherical or nearly spherical and is uniformly distributed, and the diameter range of ferrite grains is 20 to 30 mum. According to the structural features, the steel plate, especially the steel plate with high carbon content, has low hardness and high plasticity, therefore, the steel plate has good stamping and forming performance, and the preparation method is favorable for enlarging the application range of medium and high carbon steel plates in a stamping and forming process of components and parts in complex shapes.

The invention belongs to the technical field of metallurgy, and in particular relates to a spheroidizing annealing method for Cr and Mo steel with a sheet type microstructure. The spheroidizing annealing method comprises the steps of putting a Cr and Mo steel rolled product sample into a heating furnace, heating to 700-720 DEG C, preserving the temperature for 4-5 hours, then performing furnace cooling to 580-600 DEG C, taking out the Cr and Mo steel rolled product from the furnace, and cooling to room temperature, wherein the microhardness of the Cr and Mo steel rolled product subjected to spheroidizing annealing is 162.20-175.35HV, and the microstructure of the Cr and Mo steel rolled product consists of granular carbides dispersed on a ferritic matrix; the granular carbides have spheroidized structures in the level 5-6. According to the method, sub-medium temperature is preserved for certain time, and then the furnace cooling time is controlled, so that spheroidizing-annealed steel with high performance is obtained. The high preserved temperature is lower than the preserved temperature of the original technology, and the heat preservation time is shortened by almost three times, so that the energy consumption is obviously reduced, and the spheroidizing annealing efficiency is improved; the hardness of the steel subjected to the spheroidizing annealing technology is obviously reduced, the structure of a spheroidal pearlite is dispersive and fine, and the spheroidizing rate is high; the Cr and Mo steel subjected to spheroidizing annealing is high in cold heading performance and has a good application prospect.

The invention belongs to the technical field of metallurgy and particularly relates to a method for preparing a developed {100} texture non-oriented silicon steel thin belt based on thin belt continuous casting. The method is performed according to the following steps that firstly, molten steel is smelted according to the set components, and the components comprise, by weight percentage, 0.01-0.05% of C, 1.5-3.0% of Si, 0.2-0.3% of Mn, smaller than or equal to 0.005% of Al, 0.01-0.04% of V, 0.002-0.005% of S and the balance Fe and inevitable impurities; secondly, a cast belt is formed after the thin belt continuous casting process; thirdly, hot rolling is performed under the inert atmosphere condition; fourthly, scale is removed in a pickling manner, and then single-stage or two-stage cold rolling is performed; and sixthly, two-stage re-crystallization annealing is performed, an insulating coating is coated and dried, and high-performance non-oriented silicon steel is obtained. According to the method for preparing the developed {100} texture non-oriented silicon steel thin belt based on thin belt continuous casting, on the basis of partially utilizing the inherited effect of a {100} texture in an initial solidifying structure, the driving force is provided by means of a subsequent decarburization phase change, it is promoted that a developed {100} texture is formed in a finished product plate, and therefore the high-performance non-oriented silicon steel is obtained.

The invention belongs to the technical fields of metal materials and metallurgy and particularly relates to a magnesium alloy with good millability and a preparation method of a magnesium alloy plate. The magnesium alloy with good millability is an Mg-Zn-Cu magnesium alloy and comprises the following components by weight percent: 1.0%-5.5% of Zn, 1.0%-4.0% of Cu, 0-1.0% of Mn or Zr, 0-1.0% of Y, Nd, Gd, Ce or MM, less than 0.005% of impurity Fe and the balance of Mg. The preparation method of the magnesium alloy plate comprises the following steps: preheating a magnesium alloy sample obtained through smelting and casting to 300-450 DEG C, and keeping the temperature for 2h; rolling at a roller temperature ranging from the room temperature to 200 DEG C, wherein the pass reduction rate is 10%-65% and the total reduction rate is 80%-90%; and thus obtaining the Mg-Zn-Cu magnesium alloy plate without edge cracks. The Mg-Zn-Cu magnesium alloy has no edge cracks in the hot rolling process; and if the rolling temperature is higher, the hot-rolled plate without edge cracks can be obtained under the condition that the roller is not heated and intermediate annealing is not performed to the plate.

The invention relates to IF steel containing niobium and titanium for an advanced automobile and an annealing process, which belong to the technical field of metallurgy. The IF steel containing the niobium and the titanium for the advanced automobile and the annealing process are characterized in that continuous heating is adopted in the annealing procedure, the heating rate is 4 to 8 DEG C/minute, the annealing temperature is 700 to 750 DEG C, the heat-preservation time is 1 to 10 hours, and the material is cooled to 400 to 450 DEG C along with a furnace and is taken out of the furnace for air cooling. By the mode, IF steel with excellent deep drawability can be obtained; a test sample of the IF steel after being processed by the process has excellent deep drawability; in a longitudinal direction, the tensile strength reaches 290 to 330MPa, the yield strength is 125 to 155MPa, and the elongation rate is 40 to 55 percent; in a transverse direction, the tensile strength reaches 310 to 340MPa, the yield strength is 120 to 190MPa, and the elongation rate is 40 to 55 percent; and the plane anisotropy delta r of the strain hardening index is not greater than 0.25.

The invention belongs to the field of powder metallurgy, and particularly relates to iron-based amorphous powder for preparing a coil-embedded integral-forming inductor. The inductor is prepared through the following steps that an iron-based amorphous thin belt obtained through a single-roller rapid quenching method is preheated, and is broken through a mechanical grinding and airflow grinding combined method, amorphous powder is screened in order to obtain the superfine iron-based amorphous powder, stress relieving annealing is conducted on the superfine amorphous powder in vacuum, then the superfine amorphous powder is mixed with a binding agent to conduct insulating coating granulating, coated powder after being granulated and a coil are formed in a compression molding mode to obtain the coil-embedded integral-forming inductor. The superfine iron-based amorphous powder and the coil-embedded integral-forming inductor with an excellent temperature rise character can be prepared through the method.

The invention provides a heat treatment process of a powder metallurgy aluminum alloy cold-rolled sheet. The heat treatment process comprises the steps of aluminum alloy powder pressing forming, sintering, annealing, cold rolling, intermediate annealing, finishing and heat treatment. Sintering is carried out in a vacuum hot pressing furnace; before cold rolling, blank annealing is conducted on a sintered blank; cold rolling is divided into two stages, in the first stage, when the cold rolling reduction rate is smaller than 60%, single-pass cold rolling with the rolling reduction amount smallerthan 3% and intermediate annealing are adopted in the stage, and cold rolling and intermediate annealing are alternately carried out till the total rolling reduction amount of the sheet reaches 60%;and when the total rolling reduction amount of cold rolling is larger than 60%, the second stage is executed, three passes of cold rolling (the rolling reduction of each pass is smaller than 3%) and intermediate annealing are adopted in the second stage, and the three passes of cold rolling and intermediate annealing are alternately conducted till the thickness of a sheet strip reaches the targetthickness. Heat treatment is that solid solution and aging treatment are carried out on the sheet with the required thickness so as to meet the final use requirement. The tensile strength of a powdermetallurgy 2A12 aluminum alloy obtained through the heat treatment process reaches about 540 MPa. The heat treatment process of the powder metallurgy 2A12 aluminum alloy cold-rolled sheet is high in practicability and wide in application range, and the mechanical property of the powder metallurgy aluminum alloy cold-rolled sheet can be remarkably improved.

The invention belongs to the technical field of metallurgy, and relates to a high-nitrogen 316LN stainless steel welding wire and a production method thereof. The welding wire comprises the followingchemical components in percentage by mass: less than or equal to 0.03% of C, less than or equal to 1.00% of Si, less than or equal to 2.00% of Mn, less than or equal to 0.035% of P, less than or equalto 0.03% of S, 12.0-15.0% of Ni, 16.0-18.0% of Cr, 2.0-3.0% of Mo, 0.2-0.3% of N and the balance of Fe and inevitable impurities. The production method comprises the procedures of smelting, electro slag remelting, homogenizing treatment, forging, wire rod rolling, acid pickling and annealing drawing, and nitrogen increasing treatment is carried out in the annealing drawing process. Compared witha smelting nitrogen increasing process, the production period of the welding wire is shortened, the production cost is reduced, the nitrogen element in the obtained welding wire is far higher than that in a conventional welding wire, and the tensile strength and the yield strength of the welding wire are obviously improved.

The invention discloses a preparation method of a nickel-based superalloy ultra-thin strip, relates to the field of metallurgy, and aims to provide a novel method for preparing the nickel-based superalloy ultra-thin strip. According to the technical scheme, the preparation method of the nickel-based superalloy ultra-thin strip comprises the steps that a solid-solution-state nickel-based superalloy plate serves as a blank for rolling, then the blank is subjected to three-rolling and two-annealing rolling through a four-roller cold rolling mill, a semi-finished ultra-thin strip is obtained, finally, solid-solution treatment and aging treatment are conducted, and the finished ultra-thin strip is obtained. The blank is subjected to three-rolling and two-annealing rolling by adopting a four-roll cold rolling mill, and the deformation of each cold rolling pass is reasonably distributed so that the influence of work hardening on the rolling process is effectively reduced, and the rolling passes are reduced as much as possible; and meanwhile, the rolling speed and tension are reasonably controlled, effective deformation of the blank in the rolling process is controlled, and the blank is prevented from being snapped. The method is used for preparing the nickel-based superalloy ultra-thin strip with the thickness of 0.10-0.16 mm.

The invention relates to the field of ferrous metallurgy processing, and discloses a 10CrNi3MoV round tube blank and a preparation method and application thereof. The method comprises the following steps that 1, burdening is carried out according to the formula amount, and after electric arc furnace smelting, ladle furnace refining and vacuum degassing refining are carried out in sequence, an electroslag consumable electrode is obtained; (2) electroslag remelting is performed on the electroslag consumable electrode obtained in the step (1) to obtain a steel ingot; and (3) when the taper of thesteel ingot is smaller than or equal to 1.5%, stress relief annealing is conducted, and a round tube blank is obtained; and when the taper of the steel ingot is larger than 1.5%, stress relief annealing, forging and annealing treatment are sequentially carried out, and the round tube blank is obtained. The 10CrNi3MoV round tube blank prepared by the method has high purity, good toughness and excellent formability and corrosion resistance, and can be used for preparing high-pressure seamless steel tubes and high-pressure seamless steel cylinders with excellent comprehensive performance.

The invention discloses a method for preparing a phosphorus-containing silicon steel sheet with high magnetic performance through powder sintering, and belongs to the technical field of powder metallurgy. Alloy powder with the component range of Fe-(3-6.5) wt.% Si-(0.05-1) wt.% P is prepared through vacuum melting and gas atomization, the alloy powder is placed in a ceramic crucible to be evenly compacted, a heavy object is placed for pressing, then high-temperature sintering is conducted to enable the alloy powder to be metallurgically bonded, and after hot rolling, cold rolling, annealing and other treatment are conducted, the phosphorus-containing silicon steel sheet with the excellent performance is obtained. A P element is added into a silicon steel material system, iron loss can be effectively reduced, the magnetic performance is optimized, and activated sintering is promoted; the gas atomization powder is adopted, so that few inclusions and the purity of the product can be well ensured; and under the synergistic effect of the low-melting-point P element and powder pressure sintering, the defect that spherical gas atomization powder is difficult to form is overcome, the problems of process complexity and subsequent degumming and carbon residues caused by the fact that a forming agent needs to be added are avoided, the preparation process flow is effectively shortened, and the method has the beneficial effects of being easy to operate, high in production efficiency, short in process flow, excellent in performance and the like.

The invention belongs to the technical field of metallurgy, and relates to ultra-short process rare earth oriented silicon steel and a preparation method thereof, the ultra-short process rare earth oriented silicon steel comprises the following chemical components in percentage by weight: 2.0-4.5% of Si, less than or equal to 0.003% of C, 0.001-0.05% of Y, 0.15-0.35% of Mn, 0.03-0.04% of Al, 0-0.5% of Cu, 0.025-0.04% of S, 0.011-0.013% of N, and the balance of Fe and inevitable impurity elements. The preparation process comprises the steps of molten steel smelting, thin-strip continuous casting, cold rolling and recrystallization annealing. Compared with a conventional production mode, the processes of continuous casting, rough rolling, hot continuous rolling, normalizing, decarburization annealing and the like are omitted, and the production process is greatly simplified. And by adding the rare earth element yttrium, precipitation of the inhibitor is promoted, the solidification structure of the thin-strip continuous casting silicon steel is remarkably refined, the structure uniformity is improved, uniform and fine isometric crystals are obtained, and the performance of the oriented silicon steel is optimized.