4520 results about "Galvanization" patented technology

The invention relates to a steel wire rod for an 1860MPa-level bridge cable galvanized steel wire and a manufacturing method of the steel wire rod. The steel wire rod for the 1860MPa-level bridge cable galvanized steel wire comprises the following raw materials by weight percent: 0.81-0.90% of C, 0.70-1.60% of Si, 0.60-0.90% of Mn, 0.02-1.20% of Ni, 0.00-0.25% of W, 0.015-0.030 of Al, 0.00-0.70% of Cr, 0.00-0.15% of V, 0.002-0.006% of Ca, less than or equal to 0.015% of P, less than or equal to 0.015% of S and the balance of Fe and inevitable impurities, wherein the total quantity of the impurity elements is lower than 0.05%. For the steel wire rod and the preparation method of the steel wire rod, the steel wire rod is not required for salt bath processing, and can be produced by adopting conventional drawing technique, the finished steel wire after being drawn and galvanized has the strength higher than 1860MPa, has 14 times of torsion values, and can be applicable to the need for construction of extra big span bridge.

The invention relates to a combined technique of treating and reusing the organic sewage which is rich in cyanogen, ammonia and salt, and adopts the combined techniques of acidified decyanation (with the sodium cyanide recollected), basified ammonia blowing (with ammonium salt recollected), oxidation by adding chlorine, biological treatment, precipitation and clarification, deep oxidation, biological active carbon filtering, one-time brine refining, microstraining film, and other combined techniques, and then the chlorine alkali is produced after the secondary brine refining in the chlorine alkali industry and the entrance into the ionic membrane electrobath. The combined technique can be used for treating the industrial sewage in the tricyanogen chloride, chlorine alkali, gold mine, galvanization and other industries and conduct recovery of the resources, thereby overcoming the disadvantages that the prior art has narrow applicability and treatment function and disappointing treatment result, cannot recollect the resources, and has high treatment cost and unobvious economical benefit. The combination of the technique is scientific and reasonable, the technique is novel, unique and mature, the treatment is good, and the combined technique has a plurality of functions, strong applicability, wide use range and remarkable environmental and economical benefit.

The invention discloses a hot-rolled wire rod for a 1,960MPa-level cable rope galvanized steel wire and a production method. The hot-rolled wire rod is prepared from, by weight percent, 0.85%-0.91% of C, 0.20%-1.00% of Si, 0.60%-0.90% of Mn, 0.25%-0.35% of Cr, 0.015%-0.040% of Al, not larger than 0.025% of P, not larger than 0.025% of S, 0.02%-0.07% of V, not larger than 0.20% of Cu, not larger than 0.0030% of Ca and the balance Fe and inevitable impurity elements. Reasonable component contents are adopted in the wire rod, the wire rod has the beneficial effects of being high in tensile strength and plasticity, the situation of hardening during machining in the drawing process can be effectively reduced, and the torsional property of the steel wire obtained through drawing is effectively guaranteed. In the wire rod obtained through the method, the sorbite structure proportion reaches 90% to 93%, the tensile strength of the wire rod is larger than or equal to 1,320 MPa, and the area reduction rate is larger than or equal to 40%. After the wire rod obtained through the method is subjected to drawing, galvanizing and stabilizing treatment, the tensile strength of the steel wire is larger than or equal to 1,960 MPa, the torsion index is larger than or equal to 14 times, and the wire rod can be used for producing the 1,960MPa-level bridge cable rope galvanized steel wire and is suitable for ultra-large-span bridges with the ultrahigh requirement for strength.

The invention discloses a production process of a contact net anchorage steel wire rope. The production process comprises the following steps: carrying out surface acid cleaning and phosphating; drawing; carrying out lead bath heat treatment; galvanizing; drawing; detecting; entwisting; stranding; forging; and greasing. The production process has the advantages of convenience in operation and time-saving and labor-saving properties; and the produced contact net anchorage steel wire rope has the advantages of high breaking force, long fatigue service life, good abrasion resistance and good corrosion resistance.

Disclosed is a bonding method for dissimilar materials made from metals and its resulting structures. The materials to be bonded are formed by layering three or more sheets such that a dissimilar material interface and a same material interface are formed. A first current is conducted between a three-sheet layered plate material wherein an aluminum alloy plate, a zinc plated steel plate and a bare steel plate, for example, are layered in order. A nugget is formed in an interface between the zinc plated steel plate and the bare steel plate, which are the same materials. Then, a second current greater than the first current is conducted, and a nugget is formed in an interface between the aluminum alloy plate and the zinc plated steel plate.

The invention relates to a galvanized steel sheet excellent in surface abrasion resistance, corrosion resistance and acid and base resistance and a water-based surface treating agent. The surface of a galvanized steel sheet is coated with the surface treating agent in a solidified mode, wherein the surface treating agent includes water-based positive ion polyurethane composite resin, compound organic silane coupling agents containing bis-organic silane coupling agents and mono-organic silane coupling agents, compound lubrication particles containing teflon-surface modification high-density polyethylene particles, oxidized graphene, water-soluble fluorine-containing compounds, water-soluble phosphorous compounds, water-soluble rare earth salt compounds and other components, and therefore the surface treatment galvanized steel sheet excellent in surface abrasion resistance, corrosion resistance and acid and base resistance is obtained. Meanwhile, the surface treatment galvanized steel sheet has good resistance, such as solvent resistance, to all kinds of chemical media.

The invention provides a wire rod for a galvanized steel wire of a 1770MPa bridge stay cable comprising the following chemical elements (by wt percentage): C, 0.85 to 0.9; Si, 0.12 to 0.32; Mn, 0.6 to 0.9; P, less than or equal to 0.025; S, less than or equal to 0.025; Cr, 0.1 to 0.25; V, less than or equal to 0.06; Cu, less than or equal to 0.1; the rest, inevitable impurity elements. The invention also provides a manufacturing method of the wire rod. The wire rod provided by the invention has the tensile strength Rm of 1300 to 1400 MPa, the elongation after fracture A which is more than or equal to 8 percent, and the contraction of area Z which is more than or equal to 30 percent (after aging, the contraction of area is more than or equal to 35 percent). The galvanized steel wire made of the wire rod can completely meet the technical requirements of the galvanized steel wire of the 1770MPa bridge stay cable, such as fatigue tests of high dynamic load (more than or equal to two million cycle-index), high toughness and high torsion (more than or equal to eleven times), etc.

A galvanized steel sheet has a composition containing, by mass %, C: 0.05% or more and 0.5% or less, Si: 0.01% or more and 2.5% or less, Mn: 0.5% or more and 3.5% or less, P: 0.003% or more and 0.100% or less, S: 0.02% or less, Al: 0.010% or more and 0.5% or less, B: 0.0002% or more and 0.005% or less, Ti: 0.05% or less, a relationship of Ti>4N being satisfied, and the balance comprising Fe and inevitable impurities, and a microstructure containing 60% or more and 95% or less of tempered martensite in terms of area ratio and 5% or more and 20% or less of retained austenite in terms of area ratio, or further containing 10% or less (including 0%) of ferrite in terms of area ratio and/or 10% or less (including 0%) of martensite in terms of area ratio, the tempered martensite having an average grain diameter of 5 μm or less.

The invention provides a trivalent-chromium blue-white passivator for a zinc-plated permanent magnetic material and a passivation method thereof. The trivalent-chromium blue-white passivator contains a main film-forming agent, an auxiliary film-forming agent, a stabilizer, an oxidant and a surfactant, wherein the main film-forming agent is a soluble salt of trivalent chromium, the stabilizer is selected from at least one of fluoride, citric acid and oxalic acid, the auxiliary film-forming agent is selected from at least one of soluble cobalt salt, soluble nickel salt or soluble salts of rare-earth elements, the oxidant is nitrate ions or hydrogen peroxide, and the surfactant is NPE (Nonylphenol Polyoxyethylene Ether) or sodium dodecyl benzene sulfonate. The trivalent-chromium blue-white passivator provided by the invention has a low cost, does not pollute the environment, and also does not cause damage to the health of operators.

The invention discloses a steel mill continuous annealing galvanized sheet chromium-free compound passivator which comprises the following raw materials in percentage by weight: 5-20 percent by weight of a main film-forming agent, 0.1-5 percent by weight of a coupling agent, 0.1-0.5 percent by weight of inorganic complex film-forming agent, 0.1-4 percent by weight of silicate, 0.1-0.4 percent of an emulsifying agent, 0.1-0.2 percent of a dispersing agent, 0.1-0.4 percent of a corrosion inhibitor, 0.1-0.3 percent of a protective colloid, 0.1-1 percent of a nanometer sealing agent, 0.1-0.4 percent of phosphate and the balance of water. The steel mill continuous annealing galvanized sheet chromium-free compound passivator disclosed by the invention is uniform in appearance, stabilizes a liquid, has an expiration date of above 90 days, is nontoxic and environment-friendly, and accords with the ROHS (Restriction Of Hazardous Substances) requirement. The steel mill continuous annealing galvanized sheet chromium-free compound passivator is simple in preparation process; a passivated film is uniform in appearance and has certain glossness. A galvanized sheet passivated by using the passivator has the advantages that the corrosion resistance is remarkably improved, the neutral salt mist SST (Sea Surface Temperature) resistant time reaches above 72 hours, the white rust area is less than 5 percent, the blackening resistance delta E is less than 5, the yellowing resistance delta E is less than 3, the alkaline resistance delta E is less than 3, the interlamination resistance R is less than 3 omega/cm, and the conductivity is less than 1 m Omega.

The invention relates to a construction method for a spherical curved surface stainless steel curtain wall. The method comprises the following steps of: performing construction setting-out, erecting an operating scaffold, installing steel supports, steel keels and backing galvanized iron sheets, constructing fireproof layers and thermal insulation layers, installing waterproof aluminum plates, aluminum alloy keel supports and double curved surface stainless steel panels, injecting glue, performing a spray test, constructing sound absorbing layers, and the like on the outer side of the finished spherical building structure, so that a spherical mirror surface stainless steel plate curtain wall which has strong metal texture and high surface finish and is convenient to clean is formed on the surface. The fireproof layers and the thermal insulation layers are constructed in a spraying mode, so that a reinforcement measure in the conventional mode for the fireproof layers and the thermal insulation layers is eliminated, and engineering cost is saved.

The invention provides a thermal treatment wire rod for a 2000MPa-grade cable steel wire and a production method. The thermal treatment wire rod is prepared from the following components in percentage by weight: 0.85 to 1.0 percent of C, 0.80 to 1.5 percent of Si, 0.30 to 0.80 percent of Mn, 0.20 to 0.80 percent of Cr, less than or equal to 0.015 percent of P, less than or equal to 0.010 percent of S, 0.01 to 0.08 percent of Al, and the balance of Fe and inevitable impurities. According to the thermal treatment wire rod for the 2000MPa-grade cable steel wire and the production method disclosed by the invention, through special design of the components, the wire rod is produced through processes of smelting, continuous casting, blank casting and grinding, steel rolling and off-line thermal treatment, and the sorbitizing rate of the wire rod is greater than 95 percent, tissues are homogenized, and quenching tissues such as network carbide and martensite are avoided. After the wire rod is subjected to drawing, zinc (aluminum) plating, and stabilization treatment, the strength of the steel wire is greater than or equal to 2000MPa, so that the wire rod can be used for producing the 2000MPa-grade cable zinc (aluminum) plating steel wire for bridges, and is applied to bridges requiring extra long-span and ultrahigh strength.

A galvanized steel sheet having (a) a dual phase microstructure with a martensite phase and a ferrite phase and (b) a composition containing by percent weight: carbon in a range from about 0.01% to about 0.18%; manganese in a range from about 0.2% to about 3%; silicon ≦ about 1.2%; aluminum in a range from about 0.01% to about 0.1%; one or both of chromium and nickel in a range from about 0.1% to about 3.5%; calcium in a range from about 0.0003% to about 0.01%; phosphorus ≦ about 0.01%; sulfur ≦ about 0.03%; nitrogen ≦ about 0.02%; molybdenum ≦ about 1%; copper ≦ about 0.8%; one or more of niobium, titanium, and vanadium ≦ about 1%; and boron ≦ about 0.006% by weight; and with the balance of the composition being iron and incidental ingredients. In one embodiment, the steel sheet is both galvanized and galvannealed.

The present invention relates to surface treating agent for zinc coated steel plate, and is especially one kind of surface treating agent with excellent alkali resistance and solvent resistance for zinc coated steel plate. The surface treating agent is water solution, which consists of fluoric acid with 4 or more fluorine atoms and at least one of Ti, Zr and Si atome in 0.1-5.0 wt%; phsosphorus containing compounding 0.01-0.5 wt%; one or more organic silicon coupling agent with amino group containing at least one active hydrogen atom 10-20 wt%, one or more organic silane coupling agent with at least one epoxy group 25-50 wt%; at least one kind of cationic or non-ionic water soluble polyurethane resin 30-60 wt% and vanadium compound 0.1-1.0 wt%. It is used in forming protecting film with excellent performance on the surface of zinc coated steel plate.

A rustproofing agent for a zinc plated steel sheet is provided which contains (A) a chromium aqueous solution containing an organic substance and (B) an acid metal such as a metal salt of nitric acid or phosphoric acid. All of the chromium in the chromium aqueous solution of component. A is trivalent chromium. It is preferable if the organic substance in component A contains at least one type of oxy acid or oxide thereof. The metal in the acid metal salt of component B is an alkaline earth metal, cobalt, nickel, iron, zirconium, titanium, etc. It is also preferable if (C) a water-dispersible silica is contained as an additional component. The present invention also provides a zinc plated steel sheet, in which at least one side of the surface of a zinc plated steel sheet is coated with the zinc plated steel sheet rustproofing agent and the rustproofing agent dried to form a coating with a dry coating weight of 0.01 to 3 g/m<2>.

The present invention relates to a magnesium alloy surface microarc oxidation method. Said method includes the following steps: (1), pretreatment; (2), preparing alkaline silicate electrolyte or alkaline aluminate electrolyte; and (3), placing the pretreated magnesium alloy in the alkaline silicate electrolyte or alkaline aluminate electrolyte and making microarc oxidation; applying DC current, continuously rising voltage, constant current, current density is 1-15 A/sq.dm, galvanization time is 5-90 min and electrolyte temperature is less than 40 deg.C.

The invention provides a production method of a high-strength steel rope. The production method of the high-strength steel rope is characterized that low carbon is selected and used as raw materials of the steel rope, and the production technology comprises a first step of surface processing, wherein wire materials are placed on a pay-off rack, the diameter of the wire materials is 5.5mm, hot-rolled oxide-scale is eliminated through mechanical dephophorization equipment, high-power ultrasonic cleaning is conducted on the wire materials, the wire materials enter phosphating equipment, phosphating is conducted on the wire materials, the wire materials enter drying equipment and are dried finally, and preprocessed wire materials are obtained; a second step of drawing, wherein the preprocessed wire materials obtained from the first step are placed on a drawing machine, multi-pass drawing is conducted on the preprocessed wire materials, semi-finished wire materials are obtained, and winding up is conducted through a spool; a third step of water bath heat treatment and galvanization, wherein the semi-finished wire materials obtained in the second step are placed on the pay-off rack, the semi-finished wire materials are heated in a four-section form heat treatment furnace, quenching, drying, galvanization and cooling are conducted on the semi-finished wire materials, semi-finished wire materials are obtained, and winding up is conducted; a fourth step of wet type drawing, wherein the semi-finished wire materials obtained in the third step are placed on the drawing machine, multi-pass drawing is conducted on the semi-finished wire materials, the compression angle of a wire-drawing die of each pass is 13-14 degrees, dedicated lubricating agent is used as lubricating agent, the concentration of the dedicated lubricating agent is 2%-3%, finished wire materials are obtained, and winding up is conducted through a spool; a fifth step of stranding and rope forming, wherein the finished wire materials are placed on a stranding machine, stranding and laying-up are conducted, and the finished steel stranded rope is obtained.

The invention is directed to providing, for application in automobiles, construction materials, household appliances and the like, high-strength sheets excellent in formability properties such as hole expansibility and ductility, and also in fatigue resistance, characterized in comprising, in specified contents expressed in mass %, C, Si, Mn, P, S, Al, N and O and a balance of iron and unavoidable impurities, and having a steel sheet structure composed mainly of ferrite and hard structures, a crystal orientation difference between some ferrite adjacent to hard structures and the hard structures of less than 9°, and a maximum tensile strength of 540 MPa or greater.

The invention discloses a passivating treating agent for environment-friendly galvanized steel sheets, which is composed of 2-20% of silane, 1-5% of anti-rusting metal salt, 8-20% of resin, 0.1-5% of coating additive, 0.5-5% of pH regulating agent and 50-70% of water. The passivating treating agent features in simple and convenient preparation process and mainly depends on mixing production; drying temperature thereof is as low as 50-60 DEG C, in 96 hours, salt mist resistance property is no more than 3% and performance thereof is good.

The invention relates to a method for preparing dithiocarbamate-based modified porous starch. The method comprises the steps that: using starch as the raw material; carrying out enzymolysis on the starch for 1 to 26 hours under the condition that the pH is between 4 and 6 and the temperature is between 30 and 60 DEG C by a complex enzyme consisting of a saccharifying enzyme and an alpha-amylase; drying the obtained product to prepare porous starch; and after carrying out crosslinking, etherification and aminating modification on the porous starch, grafting the product with carbon disulfide under the alkaling conndition to obtain the dithiocarbamate-based modified porous starch. Compared with the conventional porous starch, the dithiocarbamate-based modified porous starch of the invention has strong absorption characteristic and high adsorptive selectivity. When the adsorption effect is reduced, the dithiocarbamate-based modified porous starch is taken out and immersed in 2mol.L-1 of HNO3 solution to carry out desorption, the desorption ratio is over 90 percent, and the absorption effect is not reduced by repeated desorption. The invention has commendable economic and social benefits, and can be used for treatment of heavy metal ions in waste water in galvanization, battery and mining industries and the like.

Disclosed are a high strength hot-dip galvanized or galvannealed steel sheet, which has improved press formability and plating adhesion and is useful as a member for automobile, building, electric or other members, and a process for producing the same.

This high strength hot-dip galvanized or galvannealed steel sheet comprises: (a) a steel sheet substrate comprising, by weight, carbon (C): 0.05 to 0.2%, silicon (Si): 0.2 to 2.0%, manganese (Mn): 0.2 to 2.5%, and aluminum (Al): 0.01 to 1.5%, the silicon and the aluminum having a mutual relationship represented by formula 0.4(%)≦Si+0.8 Al (%)≦2.0(%), the steel sheet substrate further comprising at least one member selected from the group consisting of (i) 0.003 to 1.0% of tin (Sn), (ii) 0.005 to 1.0% in total of at least one member selected from antimony (Sb), bismuth (Bi), and selenium (Se), (iii) 0.005 to 1.0% in total of at least one member selected from beryllium (Be), magnesium (Mg), calcium (Ca), and zirconium (Zr), and (iv) 0.005 to 1.0% in total of at least one member selected from scandium (Sc), yttrium (Y), lanthanum (La), and cerium (Ce), with the balance consisting of iron (Fe) and unavoidable impurities, the volume fraction of retained austenite in the steel structure being 2 to 20%; and (b) a zinc (Zn) coating layer provided on said steel sheet substrate.