94results about How to "Improve Platability" patented technology

A hot-dip galvanized steel sheet having both high strength and good formability. A process for producing said hot-dip galvanized steel sheet without requiring additional steps of surface grinding and pre-plating.The hot-dip galvanized steel sheet is produced by forming a hot-dip galvanizing layer on a base cold-rolled steel sheet composed of C (0.02-0.20 mass %), Mn (1.50-2.40 mass %), Cr (0.03-1.50 mass %), Mo (0.03-1.50 mass %), 3Mn+6Cr+Mo (no more than 8.1 mass %), Mn+6Cr+10 Mo (no less than 3.5 mass %), Al (0.010-0.150 mass %), and Fe as the principal component, with Ti limited to 0.01 mass % or less, Si limited to 0.04 mass % or less, P limited to 0.060 mass % or less, and S limited to 0.030 mass % or less, and said base steel sheet having the composite microstructure composed mainly of ferrite and martensite.

Hot dip galvanized steel sheet excellent in shapeability and plateability comprised of high strength steel sheet according to the present invention can be provided containing, by mass % about, C: 0.05 to 0.25%, Si: 0.3 to 2.5%, Mn: 1.5 to 2.8%, P: 0.03% or less, S: 0.02% or less, Al: 0.005 to 0.5%, N: 0.0060% or less and the balance of Fe and unavoidable impurities. The exemplary steel sheet can have thereon a galvanized layer containing, e.g., about Al: 0.05 to 10 mass % and Fe: 0.05 to 3 mass % and the balance of Zn and unavoidable impurities. Such exemplary hot dip galvanized steel sheet can have oxides containing Si in an average content of about 0.6 to 10 mass % at the crystal grain boundaries and in the crystal grains at the sheet steel side 5 μm or less from the interface between the high strength steel sheet and the plating layer and by the presence of Fe—Zn alloy with an average grain size of about 0.5 to 3 μm at the plating side.

The invention relates to an alloyed hot-galvanized baking-hardened steel plate and the manufacturing method thereof, which solves the problems of the anti-pulverization of the galvanized layer, the surface quality and the baking-hardened value. The mass percentage for the chemical components of a baseplate is as follows: C 0.0015 to 0.0025 percent, Si less than or equal to 0.030 percent, Mn 0.50 to 0.60 percent, P 0.050 to 0.060 percent, S less than or equal to 0.015 percent, N less than or equal to 0.003 percent, sol.Al 0.030 to 0.055 percent, Nb 0.004 to 0.015 percent, O less than or equal to 0.0050 percent and the rest are Fe and unavoidable impurities. The weight of the galvanized layer (for a single side) is 30-60g/m2 and the mass percentage for the Fe component of the galvanized layer is 8 to 12 percent. The steel plate of the invention has excellent anti-pulverization performance of the galvanized layer, excellent surface quality and appropriate baking-hardened value.

The invention discloses a high-strength cold-rolled hot-galvanized dual-phase steel plate, characterized in that components, in mass percentage, are: 0.03% to 0.15% of C, less than or equal to 0.15% of Si, 1.00% to 1.75% of Mn, less than or equal to 0.015% of P, less than or equal to 0.012% of S, 0.02% to 0.15% of Al, 0.35% to 0.75% of Cr, 0.02% to 0.15% of Cu, 0.010% to 0.035% of Ti, less than or equal to 0.005% of N, in addition meeting the requirement that the total percentage of Mn, 1.29Cr and 0.46Cu is not less than 1.5% and not more than 2.5%, and the balance being Fe and inevitable impurities. The manufacture method comprises converter smelting, secondary refining, continuous casting, hot continuous rolling, cold acid continuous rolling, annealing galvanizing and hot dipping, wherein a galvanized substrate with a reasonable organization and composition and an excellent plate shape is obtained through controlled rolling and controlled cooling while rolling; and through employing a micro-slowly cooling way for heating from an end segment to an isothermal segment and a secondary fast cooling way for a fast cooling segment during continuous annealing galvanizing, the cold-rolled hot-galvanized dual-phase steel plate is obtained, wherein the steel plate is advantageous by having a tensile strength between 490 to 700 MPa, well-matched strength and ductility, an excellent coating performance, and a thickness between 0.5 to 2.5 mm, and can be used as an automobile cover component, an inner plate, a structural component, etc.

The invention, belonging to the field of high-intensity alloy steel, relates to a preparation method of a Nb, Ti alloyed low-carbon high-intensity high-plasticity twinning induced plasticity (TWIP) steel. The steel comprises the following ingredients: 0.05-0.10 wt% C, 23.5-27 wt% of Mn, 0.01-0.03wt% of Si, at most 1.0 wt% of Al, at most 0.01 wt% of P, at most 0.02 wt% of S, 1.0-2.5 wt% of Nb, 0.5-1.25 wt% of Ti, 0.02 -0.08 wt% of N, and the balance consisting of Fe and inevitable impurities. The preparation method comprises the following steps: melting the ingredients and then casting into a casting blank, heating the casting blank and then carrying out hot rolling at the opening rolling temperature of 1100-1150 DEG C with multiple passes and small press quantity to obtain the accumulated deformation degree of more than 60 % at the temperature of more than 950 DEG C, processing the casting blank in a finishing rolling mode at the temperature of 850-900 DEG C, after the hot rolling, rapidly cooling to 400-550 DEG C for reeling, carrying out cold rolling on the steel plate processed by hot rolling with the thickness of 0.5-3.0 mm, preserving the steel plate processed by cold rolling at the temperature of 650-850 DEG C for 3-30 min, and then rapidly cooling to room temperature with the cooling rate of 10-50 DEG C/s. The material prepared by the method can be applied in automobile manufacturing industry. The material has the yield strength of more than 550 MPa and the elongation rate of no less than 60 %, thereby obviously improving the ability of anti-collision and impact of automobile for the first time and greatly increasing the crashworthiness indexes.

A copper alloy for electronic machinery and tools, having a surface layer of a work affected layer whose thickness is 0.2 μm or below; and a method of producing the same.

450 MPa-level zinc-plated dual-phase steel for a sedan comprises components in percentage by weight as follows: 0.04%-0.09% of C, smaller than or equal to 0.01% of Si, 1.0%-2.0% of Mn, smaller than or equal to 0.015% of P, smaller than or equal to 0.010% of S, 0.01%-0.08% of Als, 0.01%-0.30% of Mo, 0.01%-1.0% of Cr, 0.001%-0.03% of Nb and smaller than or equal to 0.005% of N. The production steps comprise heating of a casting blank after smelting, refining and continuous casting; finish rolling; reeling; cold rolling after acid pickling; hot galvanizing; finishing. The mechanical properties of a product are shown as follows: the yield strength is 260-320 MPa, the tensile strength is 470-510 MPa, the elongation percentage is 28%-33%, and the n value is 0.17-0.19; the product has good platability, the surface of a plating has uniform glossiness and doesn't have defects, an inhibition layer is continuous and compact, the adhesion of the zinc-plated layer reaches the first level of ball impacting, the bending test proves that the zinc-plated layer and base steel are qualified, and surface quality requirements of an intermediate car for a high-strength structural part and an outer covering part can be met.

The invention discloses a flexible strip processing line suitable for producing various high-strength steel, which has the following configuration: decoiling, cleaning, heating, soaking and slow cooling stations are arranged sequentially to a gas jet cooling station and a water quenching cooling station; a reheating station is arranged on the rear of the gas jet cooling station; an overaging station or hot galvanizing station and coating normalizing and annealing station are arranged on the rear of the reheating station, and a movable bypass channel is connected with the reheating and overaging stations; then, final cooling and leveling stations are arranged, and oiling or passivating and other postreatment stations are connected to a coiling station so as to obtain finished products; an acid pickling and electroplating stations are arranged corresponding to the water quenching cooling station; and a connecting channel is arranged on the rear of the electroplating station, and is correspondingly connected with the reheating or directly connected with the passivating station and other posttreatment stations. The flexible strip processing line integrates production of common cold-rolled sheets, and hot dip galvanized and coating alloying annealed sheets and electroplating of Zn and Ni sheets, particularly superstrength cold-rolled sheets, galvanized sheets and hot dip galvanized and coating alloying annealed sheets to one machine set so as to realize flexible production.

The invention relates to an end-blocking slurry for a flaky component, which is prepared from the following raw materials in percentage by mass: 40 to 55 percent of silver powder, 4 to 15 percent of glass powder, 5 to 25 percent of inorganic filler and 20 to 40 percent of organic carrier, wherein the silver powder comprises the following silver powder in percentage by mass in the slurry: 25 to 40 percent of flaky silver powder and 15 to 30 percent of spherical silver powder. The end-blocking slurry has the advantages that: (1) the content of silver is low so as to reduce the cost of the slurry and improve the market competitiveness of the products, and 300 RMB can be saved in 1 kg of the slurry; (2) lead is not contained in the slurry, which is in favor of environmental protection; (3) a compact and flat conductor layer is formed at the end head of a substrate without pit and bulge after the processes of dipping the silver, drying and sintering, so the platability is good, the adhesive force is strong, and the glass is acid resistant. The slurry has good process use characteristics and is suitable to be used in the industries for generating the flaky components.

The invention relates to a method for silvering a kovar alloy interconnection piece. The method comprises the following steps of 1, carrying out surface screening and wiping cleaning, 2, carrying out combined oil removal, 3, carrying out pickling and activation, 4, carrying out pre-plating treatment, 5, carrying out pre-silvering, 6, carrying out silver electroplating, and 7, carrying out electrochemical passivation. The method is characterized in that the step 3 is utilized for preparing pickle and an activation solution and carrying out pickling and activation; the step 4 is utilized for impacting nickel and plating copper on a bottom layer; and the step 7 is utilized for preparing a passivation aqueous solution and carrying out electrochemical passivation. The method has the advantages that 1, a kovar alloy is utilized as a base material of an interconnection piece for a cell array so that a production technology is simplified and a cost is reduced; and 2, on the basis of a cyaniding silver-electroplating technology, through further optimization of activation solution preparation, a pre-plating treatment method and passivation treatment, the requirements on atomic oxygen resistance, electrical conductivity and solderability of an interconnection piece are satisfied; after high/low temperature circulation, tensile strength is great than or equal to 0.83N/mm<2>; a yield is high; and the characteristics of mass production feasibility and cell array service life improvement are obtained.

The invention relates to a high manganese hot-dip galvanized steel sheet containing rare earth and a manufacture method thereof. The high manganese hot-dip galvanized steel sheet comprises the following chemical components by chemical component: 0.4-0.8% of C, 14-20% of Mn, 0.05-0.15% of RE, less than or equal to 0.020% of P, less than or equal to 0.012% of S, 1.0-2.0% of Al, 0.01-0.03% of N, and the balance of Fe and unavoidable impurity, and Mn+20*C are greater than or equal to 30%, and Al+5*Re are greater than or equal to 1.8%. The method employs a cold rolling-continuous annealing for pickling-galvanizing technology, the steel plate yield strength is 450-650 MPa, the tensile strength is 980-1100 MPa, the elongation percentage is more than 50%, structure under room temperature is 100% of austenite, the recrystallization fraction is 80-95%, the delayed cracking performance is good, and the steel sheet has superhigh strength and high mouldability. The steel sheet is especially suitable for vehicle structural members and safety members with high shaping performance and corrosion resistance as well as complex shapes, such as side door beam, bumpers, floor tunnels, various beams and b columns.

The present invention relates to one kind of elastic conductive alloy and its preparation process. The alloy consists of Cu, Ni, Sn and rare earth element Y in certain proportion, and its preparation process includes smelting mother alloy, spraying deposited blank, rolling to deform, ageing and other steps. The alloy of the present invention has not only high strength, high hardness, high elasticity, good weldability, good platability and other advantages, but also excellent heat stress relaxation resistance, good conducting stability and excellent technological performance. It may be used in electronic industry to replace beryllium bronze in making various precise instrument elements.

Coated steel used for a 500 MPa grade automobile girder comprises, by weight, 0.06-0.09% of C, not more than 0.025% of Si, 1.10%-1.29% of Mn, not more than 0.015% of P, not more than 0.006% of S, 0.020%-0.060% of Als and 0.025%-0.034% of Nb. The production method includes the steps that argon blowing is conducted in an argon station after converter smelting is conducted; casting blanks are heated after tapping is conducted and the blanks are formed through continuous casting; staged hot rolling is conducted; laminar cooling is conducted in a variable-speed cooling manner; reeling is conducted; and finishing and subsequence procedures are conducted. Under the design of low alloy components, ultrafast cooling and staged cooling are adopted, the produced coated steel used for the girder has excellent surface quality and platability, hot galvanizing production can be directly conducted, the denting resistance and coating adhesive force of steel plates are further improved, and good surface quality is achieved.

The embodiment of the invention discloses a medium manganese steel hot dipping method. Medium manganese steel comprises the following elements in percentage by mass: less than or equal to 0.5% and more than or equal to 0.1% of [C], 2.0% and more than or equal to 0.2% of [Si], 10% and more than or equal to 4% of [Mn], and 2% and more than or equal to 0.2% of [Al], the method comprises the following steps: covering an alloy coating layer on the surface of the medium manganese steel, wherein the melting point of the alloy coating layer is higher than 1000DEG C; performing thermal treatment to the covered medium manganese steel; and dipping the medium manganese steel subjected to thermal treatment into molten metal for hot dipping treatment. By adopting the method, the technical problem that the quality of the plated layer is poor as oxides are easily formed during thermal treatment process by adopting the medium manganese steel hot dipping method in the prior art can be solved.

A galvanized dual-phase steel for a 500 MPa class car comprises the following components in percentage by weight: 0.04-0.09% of C, smaller than or equal to 0.01% of Si, 1.0-2.0% of Mn, smaller than or equal to 0.015 of P, smaller than or equal to 0.010% of S, 0.01-0.08% of Als, 0.01-0.30% of Mo or 0.02-0.9% of Cr, 0.001-0.03% of Nb and smaller than or equal to 0.005% of N. The production method comprises the following production steps: heating of casting blanks after smelting, refining and continuous casting, finish rolling, reeling, cold rolling after acid pickling, hot galvanizing, and finishing. According to the mechanical properties of the product, yield strength is 295-365 MPa, tensile strength is 515-558 MPa, ductility is 25-30%, and n value is 0.165-0.18; and platability of the product is good, the surface of a plating layer is uniform in color and does not have defects, an inhibition layer is continuous and compact, the adhesive force of a zinc layer reaches level-one standard of ball punching, bending test on the zinc layer and a steel base is qualified, and requirements of intermediate cars on surface quality of high-strength structures and outer covering parts can be met.

The invention discloses a strip steel continuous hot galvanizing method. The strip steel continuous hot galvanizing method sequentially comprises the following steps of washing and pre-heating strip steel, adopting short flame to heat the strip steel to be at the temperature of 550-700 DEG C in a strip steel directly contacted mode, adopting a radiant tube heating method to continue to heat the strip steel to be at the temperature of 700-850 DEG C, sequentially soaking and slowly cooling the strip steel, adopting nitrogen and hydrogen mixed gas with 5-70% of hydrogen volume to quickly cool the strip steel to be at the temperature of 150-550 DEG C, heating the strip steel again to be at the temperature of 450-550 DEG C, performing secondary soaking to the strip steel and performing hot galvanizing treatment to the strip steel. By means of the method, the platability of ultrahigh strong steel can be obviously improved, various annealing curves can be achieved flexibly, and annealing processes which cannot be achieved by a traditional hot galvanizing unit can be achieved. In addition, the 'zinc scale' detect in starting of the unit can be obviously overcome.

The high-strength plated steel sheet of the present invention has a plated layer on the surface of a base steel sheet and contains predetermined steel components. The steel sheet includes, in the order from the interface of the base steel sheet and the plated layer towards the base steel sheet: a soft layer having a Vickers hardness that is 90% or less of the Vickers hardness at a portion t/4 of the base steel sheet, where t is a sheet thickness of the base steel sheet: and a hard layer containing martensite, bainite, and ferrite in predetermined ranges. The average depth D of the soft layer is 20 μm or greater, and the average depth d of an internal oxide layer is 4 μm or greater and smaller than D.

A high-strength plated steel sheet has a plated layer on the surface of a base steel sheet and contains predetermined steel components. The steel sheet includes, in the order from the interface of the base steel sheet and the plated layer towards the base steel sheet: a soft layer having a Vickers hardness that is 90% or less of the Vickers hardness at a portion t/4 of the base steel sheet, where t is a sheet thickness of the base steel sheet; and a hard layer containing martensite and bainite, and ferrite in predetermined ranges. The average depth D of the soft layer is 20 μm or greater, and the average depth d of an internal oxide layer is 4 μm or greater and smaller than D.