301results about How to "Refined grain structure" patented technology

The invention discloses an organic cultivation medium and an application method thereof. The organic cultivation medium is formed by fermenting a mixture comprising organic wastes (comprising straws, animal manures and organic garbage), sludge soil (urban sludge and substrate sludge of rivers and lakes) and composite soil microorganism preparations. The organic cultivation medium can be applied to plant and crop planting, and can be mixed with microelements, water-retaining agents and root-growth accelerants according to proportions in accordance with the nutrition requirement characteristics of plants and crops to form organic soil with common soil, and then the organic soil can be arranged in a manual anti-leakage cultivation slot or a specific container cultivation system to cultivate crops, vegetables and fruits, flowers or Chinese herbal medicine plants, etc.

The invention discloses an Al-Zn-Mg-Cu-Sc-Zr-RE alloy capable of being used as an ultrahigh-strength cast aluminum alloy and a preparation method thereof. In the alloy, Zn and Mg with higher content are adopted, Sc and Zr are compositely microalloyed, and trace rare earth elements Er and / or Yb are added, so that the aims of increasing an eutectic phase proportion, thinning a grain structure, suppressing dendritic crystal growth and changing an alloy solidification mode are fulfilled to reduce the heat cracking tendency of the alloy and obviously improve the casting performance of the alloy. The alloy comprises the following components in percentage by weight: 7.0 to 8.0 percent of Zn, 1.5 to 2.5 percent of Mg, 1.4 to 2.0 percent of Cu, 0.2 to 0.5 percent of Mn, 0.15 to 0.25 percent of Sc,0.10 to 0.20 percent of Zr, 0.1 to 0.3 percent of Er and / or Yb and the balance of Al. The as-cast alloy can achieve high toughness performance through long-time variable-temperature homogenization, enhanced solid solution treatment and aging treatment, can be used for producing an aluminum alloy casting with the yield strength of more than 500MPa and the elongation rate of more than 5 percent andcan be used as an alternate material for the ultrahigh-strength wrought aluminum alloy.

A disc scissors blade and its manufacturing method, the composition weight percentage of the material of the disc scissors blade is: C: 0.40-0.70%, Si: 0.50-1.2%, Mn: 0.20-0.50%, Ni: 1.00-1.50% %, Cr: 4.00-6.00%, Mo: 0.50-2.00%, V: 0.30-1.50%, Nb: 0.10-0.80%, P≤0.02%, S≤0.02%. The method introduces an electroslag remelting process into a common manufacturing method of disc shears, and increases the temperature of quenching and tempering heat treatment and final heat treatment. The disc scissors have good wear resistance and deformation resistance, and are suitable for slitting or trimming hot-rolled high-strength thick steel plates. In addition, the disc shear blade of the present invention also has a good use effect on disc shears in other similar working conditions, and can also be applied to disc shears for stripping or edge trimming of cold-rolled strip steel, and also has a promotional effect on non-ferrous metal disc shears. value and application prospects.

A technology for forming the Mg-alloy hub of car features three procedures of preshaping, upsetting-squeezing formation and fine trimming and includes such steps as casting a blank; after preshaping,making allowance for apsetting-squeezing formation; upsetting-squeezing formation and deformation degree during isothermal squeezing by using the critical-controlled deformation method; coating graphite lubricant inside the die; and fine trimming. Its advantages are fine crystal grains, and high mechanical performance and surface quality.

The invention discloses a method for achieving forming of GH4738 nickel-base superalloy turbine discs, and relates to a method for preparing the GH4738 nickel-base superalloy turbine discs. The method aims at solving the problems that an existing technology for preparing the GH4738 nickel-base superalloy turbine discs is complex and low in efficiency, and cannot achieve the purposes that the turbine discs are good in quality, even in grain distribution and free of surface crack. The method for achieving forming of the GH4738 nickel-base superalloy turbine discs comprises the following steps: adopting a compound insulation method with a sheath and insulation cotton, carrying out double-firing-number heating, upsetting and die forging, and carrying out solidifying solution and double aging processing at the subsolid solution temperature. By means of the method, the GH4738 nickel-base superalloy turbine discs with different diameter dimensions and disc thicknesses can be prepared. The method can be applied to preparation of nickel-base superalloy turbine discs in the field of petrochemical engineering and aerospace, and preparation of other disc forge pieces used under the high temperature condition.

The invention relates to the precision casting field, in particular to a preparation method of a low pressure guide connected hollow blade. The preparation method comprises the following steps: firstly quartz glass powder, mullite powder, a plasticizer and an additive are mixed to stir evenly, the mixture is filled in a core pressing device and prepared into a mother core; secondly quartz glass powder is filled in a charging bucket, the mother core is inserted in the powder, the quartz glass powder is filled in the entire charging bucket to sinter and prepare a core; the prepared core is placed in the corresponding place of a blade mould to fill wax, the mould is preheated to perform pressing, finally the obtained wax mould is dressed; then a pouring system shell is prepared; and the pouring system shell is preheated before pouring, a K417G alloy is used as the raw material, then the alloy raw material is refined at 1570+ / -10 DEG C for no less than 3 minutes, finally the liquid alloy steel is poured in the preheated pouring system shell, the pouring time is 3-5 seconds, and the finished product low pressure guide connected blade casting is formed.

The invention discloses an aluminum-magnesium alloy welding wire for the gas shield welding of an aluminum-alloy car body and a preparation method thereof. The preparation method of the aluminum-magnesium alloy welding wire comprises the following steps: smelting and refining, continuously casting and rolling, drawing the wire and carrying out surface polishing treatment on the welding wire. The aluminum-magnesium alloy welding wire disclosed by the invention has the advantages of high performance and stable and good joint performance.

The invention provides a welding wire matched with a corrosion-resistant aluminum-magnesium-scandium alloy and a preparation method thereof. The welding wire comprises the following components: 3.0-5.0wt% of Mg, 0.1-0.2wt% of Zr, 0.1-0.2wt% of Sc, 0.2-0.3wt% of Mn, 0.05-0.15wt% of Ti, 0.05-0.25wt% of Cr, 0.01-0.05wt% of Ce, 0.01-0.05wt% of Y and the balance of Al. The preparation method of the welding wire matched with the corrosion-resistant aluminum-magnesium-scandium alloy comprises the following steps: (1) preparing an aluminum-based master alloy; (2) preparing alloy raw materials; (3) refining the alloy; (4) measuring hydrogen content; (5) ingot casting; and (6) extruding and drawing for molding. The invention meets the need for welding production of an aircraft fuel tank and a rocket tank, and welding seams can obtain higher comprehensive mechanical property of joints.

The invention relates to a grinding medium applied to the powder body engineering in industries, such as construction materials, cement and the like, in particular to a production process method of ahigh-carbon multi-element alloy casting grinding ball. The casting grinding ball comprises the following chemical components by weight percent: 1.4-2.5% of carbon, 0.75-0.82% of silicon, 0.46-0.9% ofmanganese, 4.5-6.0% of chromium, 0.04-0.06% of phosphorus, 0.04-0.054% of sulfur, 0.04-0.06% of copper, 0.03-0.04% of molybdenum, 0.02-0.03% of nickel, 0.02% of tungsten, 0.13-0.15% of compound heavyrare earth modificator and 90.4-91.4% of iron. The production operation comprises steps of smelting, casting, heat treatment, mechanical property detection and pouring inspection, wherein heat treatment quenching is oil quenching treatment. The improvements are that: (A) austenitizing treatment is carried out before quenching; and (B) the temperature of quenching oil is 80-140 DEG C, and the quenching time is 6-20 minutes. The formula of the invention is adopted to thin the crystal grains of a grinding ball, the tissues are compact, and the toughness is enhanced; by adopting the technology ofthe invention, the hardness of a high-chromium grinding ball reaches HRc62-64, and the toughness and the wear resistance of the grinding ball are obviously enhanced. On the precondition of further enhancing the properties of wear resistance and crushing resistance of the grinding ball, the content of the noble metal of chromium is reduced, and the manufacturing cost of the grinding ball is also lowered.

The invention discloses a petroleum casing pipe with sulfurated hydrogen stress corrosion resistance and a producing method thereof, which aims to proceed from improvement on purity and tensile ratio of steel, tempered martensite proportion, grain refinement, remained stress reduction and other aspects, and provide the petroleum casing pipe with high obdurability and sulfurated hydrogen stress corrosion resistance and the production method thereof. The petroleum casing pipe comprises the following compositions in weight percentage: 0.12 to 0.18 percent of C, 0.10 to 0.60 percent of Si, 0.05 to 1.0 percent of Mn, 0.20 to 1.0 percent of Cr, 0.10 to 0.80 percent of Mo, 0.005 to 0.05 percent of Al, 0.005 to 0.02 percent of Ti, 0.05 to 0.15 percent of V, 0.002 to 0.02 percent of Nb, 0.0003 to 0.005 percent of Ca, 0.0003 to 0.005 percent of Mg, 0.0003 to 0.003 percent of B, less than or equal to 0.020 percent of P, less than or equal to 0.005 percent of N, and the balance being Fe, wherein the weight percentages of carbon, manganese, chromium and molybdenum are determined by a comprehensive control formula, that is A is equal to the sum of percentage of C, percentage of Mn divided by 5, percentage of Cr divided by 5, and percentage of Mo divided by 3, and the range of A is between 0.45 and 0.60 percent.

The invention discloses a high strength and ductility oil casing with hydrogen sulfide corrosion resistance and a manufacturing method for the oil casing, and aims to provide an oil casing with high impact resistance and capable of meeting the requirement for exploiting a deep oil-gas layer containing hydrogen sulfide gas and a manufacturing method for the oil casing. The oil casing consists of the following components in percentage by weight: 0.15 to 0.20 percent of C, 0.1 to 0.2 percent of Si, 0.4 to 0.6 percent of Mn, 0.6 to 0.8 percent of Cr, 1.2 to 1.6 percent of Mo, 0.01 to 0.05 percent of Al, 0.002 to 0.05 percent of Ti, 0.05 to 0.10 percent of V, 0.005 to 0.015 percent of Nb, 0.0003 to 0.005 percent of Ca, less than 0.002 percent of B, less than or equal to 0.015 percent of P, less than or equal to 0.005 percent of S, 0.003 to 0.010 percent of N, and the balance of Fe, wherein the adding amount of Mo, V, Cr and Mn satisfies that 12V+1-Mo is more than or equal to 0 and Mo-(Cr+Mn) is more than or equal to 0. According to the oil casing, the content of manganese, chromium and molybdenum is controlled through a comprehensive control formula, and hydrogen sulfide corrosion resistance and impact ductility are improved by optimizing the content of each component.

The invention relates to a method for preparing a high-strength high-plasticity aluminum-based composite material. High-purity Al, industrial pure Mg, industrial pure Zn, Al-50Cu, Al-12Zr intermediate alloy, KBF<4> and K<2>TiF<6> serve as raw materials, and by the adoption of an in-situ melt synthesis control method, the in-situ TiB<2> micro-nano particle reinforced Al-Zn-Mg-Cu alloy composite material is prepared. The extrusion deformation direction of each pass is perpendicular to the extrusion direction of the last pass. Extrusion deformation is conducted in multi-pass orthorhombic laminated extrusion mold equipment, a large amount of accumulated shearing strain can be applied to the particle reinforced aluminum-based composite material, and then the mechanical stirring function is achieved. In-situ synthesis TiB<2> particle aggregates in the composite material are scattered, micro-nano TiB<2> particles are evenly dispersed and distributed in an aluminum matrix, Al-Zn-Mg-Cu matrix grain structures of the composite material can be refined, and even and fine isometric crystals are obtained. The aluminum-based composite material prepared through the method can achieve high strength and high plasticity simultaneously.

The present invention belongs to the field of seamless steel pipe producing technology, and is especially production process of seamless composite metal pipe with metallurgical binding. The production process includes the following steps: heating the composite pipe blank in an induction heating furnace, hot extruding the composite pipe blank in an extruder for different metal layers to deform synchronously and homogeneously and to form the metallurgical binding between the different layers, annealing in an annealing furnace, straightening, end cutting and lengthing, and packing. The seamless composite metal pipe with metallurgical binding has low production cost.

The invention provides a preparation process of high-strength and high-plasticity 6061 and 6063 aluminum alloy and sectional material thereof. The preparation process is realized by adding a proper amount of Al-Ti-C-Re grain refiner in an aluminum alloy melting process, wherein the characteristic components of the grain refiner comprise 0.01-10 percent of Re (mixed Re taking Ce as a main component), 0.1-3.5 percent of Ti and 0.1-3.5 percent of C; preparing an aluminum alloy rod with superfine crystal grains; and homogenizing and extruding to form the aluminum alloy sectional material with certain high strength and high plasticity. The invention can be applied to manufacturing other series of aluminum alloys with high strength and high plasticity.

The invention relates to a graphene reinforced copper-rare earth based electrical contact material and a preparing method thereof. The electrical contact material comprises, by weight, 0.1-3.0% of graphene and 97.0-99.9% of copper-rare earth alloy, and rare earth accounts for 0.05-3.0% of the total weight of copper-rare earth alloy. The preparing method comprises the steps of powder atomization, ball milling and powder mixing, cold press molding, sintering, secondary forming and sintering. By adding a graphene reinforcing body to copper alloy to serve as the framework, the material has high hardness, high wear resistance, high mechanical impact resistance and high welding resistance. By adding rare earth, the oxidation resistance and electric arc erosion resistance of the copper alloy electrical contact material are improved.

The invention discloses high-chrome corrosion-resisting high-strength pipeline steel and a manufacturing method thereof. The high-chrome corrosion-resisting high-strength pipeline steel is prepared from, by weight percent, 0.04%-0.08% of carbon, 0.15%-0.55% of silicon, 0.15%-0.95% of manganese, 0.030% of phosphorus or less, 0.006% of sulfur or less, 0.8%-2.0% of chrome, 0.15%-0.55% of copper, 0.020%-0.090% of niobium, 0.008%-0.035% of titanium, 0.010% of nitrogen or less and the balance iron and inevitable impurities. The high-chrome corrosion-resisting high-strength pipeline steel is different from universal low-carbon high-manganese composition design, a low-carbon, low-manganese and high-chrome alloying composition system is adopted, the manganese alloy element segregation problem caused by a high-manganese system is eliminated from compositions, and band segregation structure forming is avoided. During molten steel smelting, the refining means of KR molten iron pretreatment deep desulfuration, LF and RH refining and the like are adopted, a dual slag stopping method dephosphorization technology is adopted, a rolling control and cold control rolling process is adopted for controlling phase change temperature, the grain structure is refined, and toughness matching of the pipeline steel is guaranteed; and the produced pipeline steel has excellent corrosion resistance and higher strength and toughness.

The invention discloses an electromagnetic / ultrasound compound outfield continuous casting and rolling device. A frame body (14) is fixedly provided with a magnetic field generator (17) distributed along the axial direction of a roller; a vibration-proof bar (23) is connected with and arranged on the frame body (14); at least one upper iron core (4) distributed along the axial line of the roller is connected to the vibration-proof bar (23) through a first bolt (5); the upper iron core (4) is connected with a movable iron core (6) through a hinge; an upper press plate (2) and an upper liner plate (3) are arranged between the upper iron core (4) and a casting nozzle (1); a supporting rod (9) is connected to a front box (8) and is provided with an ultrasound generator (10); and an ultrasound toolhead of the ultrasound generator (10) extends into the front box (8). The invention relates to the electromagnetic / ultrasound compound outfield continuous casting and rolling device which can refine a casting and rolling texture, increase the mechanical property, improve the anisotropy, reduce or eliminate segregation, macro and micro flaws and achieve long service life of the casting nozzle in the continuous casting and rolling process of an aluminum alloy casting and rolling plate billet.

The invention provides a medium steel plate Q345B and a production method of the same. The medium plate Q345B comprises the following chemical components in percentage by mass: 0.130-0.150% of carbon, 0.30-0.40% of silicon, 1.35-1.50% of manganese, less than or equal to 0.025 of phosphorus, less than or equal to 0.020 of sulfur, 0.005-0.01% of titanium, 0.05-0.07% of vanadium, and the content of the nitrogen is controlled to be 80-180 ppm. The tapping temperature of billet is 1180-1200 DEG C, the finish-rolling finishing temperature is controlled to be 1070-1100 DEG C, the cooling rate is 18-22 DEG C per second, and the final cooling temperature is controlled to be 650-750 DEG C. The method provided by the invention can effectively improve the internal structure of the steel and reach higher combination of toughness and strength under lower carbon equivalent. The steel has a yield strength of 401 MPa, a strength of extension of 536 MPa, the coefficient of elongation of 31%, and the cold bending index thereof are all qualified. Moreover, the material costs of the steel can be reduced by over 20 RMB / ton.

The present invention is one kind of high pressure cast copper alloy, and belongs to the field of non-ferrous metal material technology. The alloy has the chemical composition of ZCuSn3Zn8Pb6Ni1 added with Fe and Co, and consists of Sn 2.0-4.0 wt%, Zn 6.0-9.0 wt%, Pb 4.0-7.0 wt%, Ni 0.5-2.5 wt%, Fe 0.1-7.0 wt%, Co 0.5-7.0 wt% and Cu for the rest. Its smelting and casting process includes the following steps: feeding electrolytic copper or returned copper material, Pb and Sn into the furnace, adding protective cover and heating, adding Fe, Co and Ni after reaching 1200 deg.c, adding Zn after reaching 1250 deg.c and maintaining for0.5 hr, maintaining at 1250 deg.c for one other 10-15 min, skimming and casting at 1200 deg.c, cooling the casting to room temperature, heating to 800-1000 deg.c and maintaining of 3-5 hr, and water cooling and solid solution treatment. The cast copper alloy has refined crystal grain structure and high tensile strength.

The invention relates to enhancing of performances and improvement of a processing method of a magnesium alloy sheet material and particularly relates to an extrusion processing method of the high-performance magnesium alloy sheet material and belongs to the field of the technical fields of plastic processing and mechanical performance enhancing of nonferrous metals. In the invention, by means of the novel extrusion processing method, the magnesium alloy material is subjected to distribution, two cross-section-varying angular extrusion deformations and differential shear deformation during the extrusion process, wherein crystal grain tissue is continuously fined and the c axis of the crystal grains is continuously turned so that the basal texture is continuously weakened, thereby refining the crystal grain tissue, weakening the basal texture and enhancing the mechanical performances. By means of the method, two high-performance magnesium alloy sheet materials can be produced just by one extrusion operation. The processing method is simple, is low in cost, is high in efficiency and is easy to carry out, is excellent in large-scale application prospect and is a very excellent processing method for producing the magnesium alloy sheet material.

The invention discloses an environmental-friendly zinc-aluminum damping alloy and a preparation method of the environmental-friendly zinc-aluminum damping alloy. The alloy is made of, by weight percentage, 15%-27% of Al, 0.01%-0.1% of Ti, 0.1%-0.2% of rare earth, 0.02%-0.62% of Cu, 0.01%-0.5% of Mg and the balance Zn, and the sum of the weight percentages is 100%. Through the alloying and heat treatment processes, the microstructure of the alloy is obviously refined and uniformized, and the mechanical property of an existing zinc-aluminum alloy is improved. Compared with the existing zinc-aluminum damping alloy, according to the environmental-friendly zinc-aluminum damping alloy, alloy compositions do not contain silicon and lead, machining and cutting are easy, the alloy is not broken easily, environmental protection and zero pollution are achieved, and the alloy has good damping performance. The novel zinc-aluminum damping alloy can be used as a shock absorbing material and is widely used in the fields of building materials, electronics, general machines and the like.

The invention discloses a 400 MPa-grade Ti-containing hot-rolled ribbed steel bar and a production process thereof. The 400 MPa-grade Ti-containing hot-rolled ribbed steel bar comprises the followingchemical components of, 0.20%-0.25% of C, 0.55%-0.70% of Si, 1.40%-1.60% of Mn, smaller than or equal to 0.012% of N, smaller than or equal to 0.038% of P,smaller than or equal to 0.038% of S, 0.006%-0.012% of Ti, smaller than or equal to 30 ppm of O, and the balance Fe and inevitable impurities; and the matrix structure is ferrite and pearlite, the steel bar ReL is greater than or equal to 425 MPa, Rm isgreater than or equal to 590 mpa, A is greater than or equal to 25.0%, Agt is greater than or equal to 14.0%, R0m / R0eL is greater than or equal to 1.32, and R0eL / ReL is smaller than or equal to 1.15. According to the method, cheap elements C, Si and Mn are fully used to enhance the matrix, and then the micro-Ti and alternate low-cooling water-penetrating rolling process is used to refine the grain structure, the strength of the steel bar is further improved, the high-performance 400 MPa-grade Ti-containing hot-rolled ribbed steel bar which meets the standard requirement is obtained, and the manufacturing cost is low.

The invention discloses a fine grain strengthening method of an invar alloy thin strip. Invar alloy comprises the chemical ingredients of, in percentage by mass, 36% of Ni, 0.01-0.1% of C, 0.01-0.04% of Si, 0.01-0.05% of Mn, less than 0.01% of P, less than 0.01% of S and the balance Fe. A preparation process comprises the steps of smelting, casting, hot rolling, solid solution treatment, deep-cooling rolling, low-temperature recrystallization and annealing and the like. The average grain size of the prepared invar alloy thin strip is 3.9-6 microns, the strength of extension is 510-550 MPa, and the elongation percentage is 35-37%. According to the fine grain strengthening method, the ingredients of the invar alloy thin strip do not need to be changed, process control is simple, and the cost is low. By means of the fine grain strengthening method, the technical problems that the invar alloy thin strip produced through an existing process is thick and large in grain size and poor in mechanical property are solved, the cost is low, pollution is avoided, and it is beneficial to development of the high-strength invar alloy thin strip.

An effective durable anodic sacrifice assembly of Fe alloy for sea water corrosion, especially for protection of copper alloy pipelines on ships or other apparatus, consists of anodic casings, tubular anodes, flanges, nuts, and pipelines. The assembly has sectional structure. The tubular anodes with diameters of (0.9-1.2) times of those of the sea water pipelines to be protected are embedded in the anodic casings with flanges at their both ends to connect with pipelines and sealed. The lengths of the said casings and anodes are regular and they comprises Mn, Cr, Al, and balanced with Fe. The heavier of the anodes, the longer of their working service life, so that they are usable for sea water pipelines that must work over a dock maintenance period.

The invention discloses a manufacturing method for titanium and titanium alloy products by coating and forming, wherein the needed devices during a production process comprise an electric furnace, a forming machine and an infrared thermometer. The manufacturing method comprises the following steps of coating by choosing steel or pure titanium; selecting single-layer coating or double-layer coating; performing blank verification, oxidation resistance, lubrication and heating before forming, and preheating a die to be about 200 DEG C before forming; rapidly transferring the heated coated blanks onto a pressure machine for forming, and forming by 1-2 heating numbers; and measuring the temperatures of the surfaces of the blanks by the infrared thermometer during the forming process, so as to ensure that the temperatures of the blanks are always kept in a titanium alloy hot-forming temperature range during forming, and finally obtaining the titanium and titanium alloy products. Hemispherical shells manufactured by the manufacturing method disclosed by the invention meet requirements on various technical indexes with low manufacturing cost; the forming heating numbers are reduced to be 1-2 from the previous 2-3, so that the production efficiency is improved and the production cost is reduced; and the thinning rate of the material is reduced, and the utilization ratio of the material is increased.

The invention relates to improvements on composite tubular product enhancement and a machining method, in particular to a machining method of an enhanced magnesium-aluminum laminar composite tubular product. In the method, the advantages of light weight of a magnesium alloy and corrosion resistance and high plasticity of an aluminum alloy are effectively utilized, a grain structure is refined through pipe wall equal-diameter repeated extrusion, twice plastic deformation can be realized through one-time propelling, and severe plastic deformation is introduced circularly in a reciprocating way, so that the grain structure is effectively refined, and the intensity is enhanced; magnesium and aluminum layers are combined through a metallurgic reaction, so that the enhanced magnesium-aluminum laminar composite tubular product with excellent comprehensive performance is obtained, and the application range of the magnesium alloy is expanded.

The invention discloses a fine equiaxed grain Al-Zn-Mg series aluminum alloy and a preparation method thereof. The aluminum alloy comprises elements Zn, Mg, Cu, Ti, B, and the balance Al and inevitable impurity elements. The preparation method comprises the steps of preparing materials, smelting aluminum alloy, spray blowing refining in a furnace, online grain refining, online degassing filtering,semicontinuous casting, ingot casting homogenizing, heating and extruding, online quenching and manual ageing treatment. According to the fine equiaxed grain Al-Zn-Mg series aluminum alloy and the preparation method thereof, the components of the alloy and the preparation technology parameters are optimally designed, so that an Al-Zn-Mg series aluminum alloy extruding material gains a completely-recrystallized fine and uniform equiaxed grain structure; the structure stripes and color difference of an oxide film are removed, and thus the quality of the oxide film of the Al-Zn-Mg series aluminum alloy can be improved; the oxide film is uniform in color, fine in texture, high in glossiness, outstanding in coloring effect, and applicable to manufacturing of various aluminum alloy sheets or tube-bar sections with high requirements on intensity and surface decoration, such as housings, intermediate frames and side frames of various large-screen electronic products.

The invention belongs to the field of material surface engineering and in particular relates to a method for preparing a high-content WC (Wolfram Carbide) enhanced alloy powder coating by employing a laser cladding technology. The composite powder is clad on the surface of a workpiece by employing laser cladding, wherein the composite powder is prepared from WC powder and bonding-phase alloy powder according to a weight ratio, the content of WC powder in the composite powder is 50-70wt%, and the content of bonding-phase alloy powder is 30-50wt%. The WC enhanced alloy powder composite functional coating is prepared by employing the process method, the wear resistance and high-temperature performance of the workpiece are greatly improved after treatment, the service life is prolonged by over 8 times, and the economic benefits are obvious.

The invention discloses a high-strength corrosion-resistant micro-alloying copper pipe material which consists of the following components in percentage by weight: 0.005-0.04% of phosphorus, 0.2-1.0% of tin, 0-0.04% of lanthanum, 0-0.04% of cerium, 0-0.1% of nickel, 0-0.1% of zinc, 0-0.05% of cobalt, 0-0.1% of manganese, 0-0.05% of zirconium and the balance of copper. By combining phosphorus with rare earth lanthanum and / or cerium to obtain a deoxidizer of molten copper, the content of oxygen in melt is further reduced, the grain structure is refined, the recrystallization temperature is increased to prevent abnormal growth of the weld structure grain, and the ductility and thermal conductivity of copper are further improved. Through solid solution strengthening of tin and improvement of an oxide film on a surface layer, the strength and corrosion resistance of a matrix are improved. By adding trace amount of zinc, nickel and manganese subjected to solid solution into the copper matrix, the strength of the copper matrix is improved; by adding cobalt or zirconium and dispersing into the copper matrix, the strength and heat resistance of the copper matrix are improved; the combination effect is better than the performance and using effect of the existing oxygen-free copper pipe or single phosphorus deoxidization copper pipe.

The invention provides a rolling technology and a heat treatment method of pre-hardening type plastic die steel.LGP20 series, LG718 series and LG2311 series steel plates with stock thicknesses of 220 mm are subjected to the rolling technology and heat treatment.A technological process comprises the following steps: plate blank heating, rough scale removal, rough rolling, finish rolling, straightening, cooling after rolling, nibbling shear, stack cooling, flaw detection, steel plate examination, marking, shot blasting, normalizing, stack cooling, shot blasting, tempering, surface checking and performance judging.The rolling technology and the heat treatment method of the pre-hardening type plastic die steel have the advantages that an optimal heating technology is determined, and influence of casting blank segregation to steel segregation is reduced; by normalizing and tempering technologies, a structure form similar to thermal refining is obtained, and the problem that a plastic die steel plate is easy to crack in a quenching process is avoided; through large-rolling-reduction rough rolling, compactness of the structure of a steel plate is improved, and internal shrinkage of the steel plate is reduced; cooling is controlled reasonably after rolling and normalizing, the ideal structure is obtained, and cracking of the steel plate is avoided; and weather factors are overcome, and goods can be produced and supplied all the year round.