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9395 results about "SS - Stainless steel" patented technology
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Austenoferritic stainless steel having a very low nickel content and a high tensile elongation
InactiveUS6096441ALow nickel contentImproved general propertyHeat treatment process controlElectric furnaceSulfurManganese
An austenoferritic stainless steel with high tensile elongation includes iron and the following elements in the indicated weight amounts based on total weight: carbon<0.04% 0.4%<silicon<1.2% 2%<manganese<4% 0.1%<nickel<1% 18%<chromium<22% 0.05%<copper<4% sulfur<0.03% phosphorus<0.1% 0.1%<nitrogen<0.3% molybdenum<3% the steel having a two-phase structure of austenite and ferrite and comprising between 30% and 70% of austenite, wherein Creq=Cr %+Mo %+1.5 Si % Nieq=Ni %+0.33 Cu %+0.5 Mn %+30 C %+30 N % and Creq / Nieq is from 2.3 to 2.75, and wherein IM=551-805(C+N)%-8.52 Si %-8.57 Mn %-12.51 Cr %-36 Ni %-34.5 Cu %-14 Mo %, IM being from 40 to 115.
Owner:UGITECH
Heat resistant separation fabric
InactiveUS20160083285A1Improve optical qualityImproved heat resistant separation fabricLiquid surface applicatorsGlass transportation apparatusAlloyStainless steel fiber
A heat resistant separation fabric including stainless steel fibers. The stainless steel fibers are made out of an alloy comprising more than 12% by weight of chromium. The stainless steel fibers include an oxide skin. The atomic percentage of Cr at 5 nm depth of the oxide skin divided by the sum of the atomic percentages of Cr and Fe at 5 nm depth of the oxide skin, and multiplied with 100 to express as a percentage, is higher than 30%.
Owner:NV BEKAERT SA
Austenitic stainless steel, steel tube thereof and manufacturing method thereof
ActiveCN101633999AImprove high temperature creep resistanceExcellent resistance to high temperature steam corrosionTemperature control deviceManufacturing convertersSS - Stainless steelIngot
The invention relates to an austenitic stainless steel, a steel tube thereof and a manufacturing method thereof, wherein the austenitic stainless steel and the stainless steel tube comprise the components by mass percent: 0.060-0.14% of C, more than 0 and less than or equal to 0.50% of Si, more than 0 and less than or equal to 1.00% of Mn, less than 0.040% of P, less than 0.015% of S, 17.00-20.00% of Cr, 8.00-11.00% of Ni, 2.50-4.00% of Cu, 0.30-0.60% of Nb, 0.15-0.50% of Mo, 0.15-0.50% of Co, 0.05-0.14% of N, 0.001-0.01% of B, the rest of Fe and unavoidable impurity. The manufacturing method of the steel tube comprises: smelting and pouring to form steel ingots or continuously cast bloom, processing bar material, preparing tubular billet and further processing the steel tube; the method comprises the steps: the heating temperature of processing the bar material is 1250-1270 DEG C, heating temperature of preparing the tubular billet is 1100-1220 DEG C, and the finished product solid solution temperature is 1120-1190 DEG C. The austenitic stainless steel tube has high temperature creep strength and corrosion resisting performance at the high temperature.
Owner:SHANXI TAIGANG ENG TECH +1
Austenitic-ferritic stainless steel
A low Ni and high N austenitic-ferritic stainless steel is disclosed. It includes an austenitic-ferritic stainless steel having high formability and punch stretchability, crevice corrosion resistance, corrosion resistance at welded part, or excellent intergranular corrosion resistance, from a stainless steel structured by mainly austenite phase and ferrite phase, and consisting essentially of 0.2% or less C, 4% or less Si, 12% or less Mn, 0.1% or less P, 0.03% or less S, 15 to 35% Cr, 3% or less Ni, and 0.05 to 0.6% N, by mass, by adjusting the percentage of the austenite phase in a range from 10 to 85%, by volume. Furthermore, it includes an austenitic-ferritic stainless steel having higher formability by adjusting the amount of (C+N) in the austenite phase to a range from 0.16 to 2% by mass.
Owner:JFE STEEL CORP
Diffusion welding method of titanium or titanium alloy and stainless steel
InactiveCN102218592AMeet service performance requirementsHigh-strength connectionNon-electric welding apparatusTitaniumHigh intensity
The invention discloses a diffusion welding method of titanium or titanium alloy and stainless steel. A plate pack having the same material quality with welded workpieces is welded into a block structure in advance. The plate pack is lengthways cut into slices along the block structure to form a structural middle layer 7. The middle layer is processed and then vertically arranged between the welded workpieces for diffusion welding. Because the middle layer having the same material quality with the workpiece is adopted, a joint heterogeneous interface combination mode is changed into a combination mode that half heterogeneous workpieces are directly combined and half heterogeneous workpieces are combined, and the titanium or titanium alloy and stainless steel workpieces are in high-intensity connection. In the diffusion welding method, the tensile strength of the joint is improved to above 80% from 50-70%(week side workpiece intensity) obtained by the direct diffusion welding technology, and various types of titanium or titanium alloy and stainless steel can be in high-intensity connection.
Owner:NORTHWESTERN POLYTECHNICAL UNIV
Carbon steel and stainless steel clad steel plate with toughness performance and production method
The invention discloses a carbon steel and stainless steel clad steel plate with toughness performance, and belongs to the technical field of production of metal clad plates. Carbon steel is a basal material, and satisfies the requirements of API5L "American Petroleum Pipeline Steel Specification"; 316L stainless steel is a multiple layer, and components satisfy the requirements of ASTM A240M-05 standard "Standard Specification of Chromium and Chromium Nickel Stainless Steel Plate, Sheet and Strip Steel for Pressure Vessels and General Purposes"; flux is BNi brazing filler metal; and solder resist is a mixture of magnesium oxide and aluminum oxide. The process comprises steel blank assembly, heating, rough rolling, finish rolling and heat treatment. The clad steel plate has excellent toughness performance and hydrogen induced cracking resistance, so that the use safety of crude oil conveying pipes is improved.
Owner:QINHUANGDAO SHOUQIN METAL MATERIAL
Nitrogen-containing nickel-free stainless steel and metallurgy forming process for powder thereof
The invention provides a nitrogenous nickel-free stainless steel and a powder-metallurgical molding technology, relating to the field of stainless steel production. Nitrogenous stainless steel powder and a prepared cementing agent are mixed evenly in a mixing machine and then crashed to injection molding feedstock; injection molding blanks with smooth surfaces and without macro defects are obtained by an injection molder under appropriate injection temperature and injection pressure; after degreasing by chlorylene solvent, thermal degreasing and presintering are carried out to the injection molding blanks, thermal degreasing blanks with certain strength and without defects are obtained; the thermal degreasing blanks are sintered and densified in nitrogen based atmosphere, therefore, products with higher density and more excellent performance can be obtained. The nitrogenous nickel-free stainless steel of the invention can solve the problems that resource price of the nickel-contained stainless steel is expensive and the contained nickel thereof is harmful to human health and the like, extends the application scope of nitrogenous austenitic stainless steel. The materials prepared by using the nitrogenous nickel-free stainless steel of the invention are better than traditionally smelted austenitic stainless steel in terms of performance and the nitrogenous nickel-free stainless steel of the invention is resource saving and environmentally friendly.
Owner:UNIV OF SCI & TECH BEIJING
Cemented carbide insert for toughness demanding short hole drilling operations
The present invention relates to a coated cutting insert with excellent toughness properties particularly useful for toughness demanding short hole drilling in low alloy and stainless steels and a method of making the same. The inserts comprise a substrate and a coating. The substrate comprises WC, from about 8 to about 11 wt-% Co and from about 0.2 to about 0.5 wt-% Cr with an average WC-grain size of from about 0.5 to about 1.5 μm and a CW-ratio of from about 0.80 to about 0.90. The coating comprises a laminar, multilayered structure of TiN+Ti1-xAlxN+TiN+Ti1-xAlxN+TiN . . . in polycrystalline, non-repetitive form, with x being from about 0.4 to about 0.6 with a thickness of the individual TiN—or Ti1-xAlxN-layers of from about 1 to about 30 nm varying essentially at random and with a total thickness of the multilayered coating of from about 1 to about 5 μm. The layers are deposited using arc evaporation technique.
Owner:SANDVIK INTELLECTUAL PROPERTY AB
Fine casting method for super long lower pressure partition guide blade of turbine in stainless steel investment mold
The present invention discloses precise investing process of super long low pressure partition guide blade of stainless steel for turbine. Crankled stainless steel guide blade with length up to 960 mm and weight up to 42 kg may be manufactured through investing process. The present invention adopts pre-deforming profiling design and improved investing process and the produced guide blade for 600 KW steam turbo generator has high performance. The investing process includes making wax mold, making shell, smelting and casting, and heat treatment.
Owner:HARBIN XINRUN IND
Iron-based corrosion resistant wear resistant alloy and deposit welding material for obtaining the alloy
InactiveCN101505910AOvercoming brittlenessOvercome vulnerabilityWelding/cutting media/materialsSoldering mediaChromium carbideWear resistant
To provide a high-performance, inexpensive low C-high Si-high Cr-B-Nb type iron-based corrosion-resistant and wear-resistant alloy that is extremely superior in corrosion resistance and wear resistance to 304 stainless steel, high-chromium cast iron and high carbon-high chromium cast-iron-type materials, has a high corrosion-resistant property that would never be obtained from a high carbon-high chromium carbide precipitation-type iron-based wear-resistant alloy and at the same time, a wear-resistant property that is superior to these metals, and further hardly causes brittle peeling that is inherent to high Si-containing steel. This alloy contains, all percentages by weight, C: 0.5 to 2.5% by weight, Si: 2.5 to 4.5%, Mn: 0 to 10% or less, Cr: 15% to 31%, Ni: 0 to 16%, Cu: 7% or less, Mo: 10% or less, B: 0.5% to 3.5%, and 0+0.083Cr+1.05 is satisfied, within a range of 27% / =570 / Cr-0.066Cr+1.145 is satisfied, and within a range of 20% / =1.25 is satisfied.
Owner:ING SHOJI
Austenite-type stainless steel hot-rolling steel material with excellent corrosion resistance, proof-stress, and low-temperature toughness and production method thereof
InactiveUS20060243356A1Improve corrosion resistanceReduce contentRoom temperatureSS - Stainless steel
An austenitic stainless steel hot-rolled steel material can be provided which has sea-water resistance and strength superior to conventional steel. Low-temperature toughness can be maintained, which is preferable in a structural member of speedy craft. The steel material can include an austenitic stainless steel hot-rolled steel material which excels in the properties of corrosion resistance, proof stress, and low-temperature toughness. In such austenitic stainless steel hot-rolling steel material, e.g., PI[=Cr+3.3(Mo+0.5W)+16N] ranges from 35 to 40, δ cal [=2.9 (Cr+0.3Si+Mo+0.5W)−2.6 (Ni+0.3Mn+0.25Cu+35C+20N)−18] ranges from −6 to +2, and a 0.2% proof stress at room temperature is not less than 550 MPa, Charpy impact value measured using a V-notch test piece at −40° C. is not less than 100 J / cm2, and the pitting potential measured in a deaerated aqueous solution of 10% NaCl at 50° C. (Vc′100) is not less than 500 mV (as it relates to saturated Ag / AgCl).
Owner:NIPPON STEEL CORP +1
Apparatus for the transport and storage of proppant
ActiveUS20150284194A1Facilitating ability to quickly and inexpensively off-load proppantImprove velocity and turn-around and revenue-generating capacityConveyorsLarge containersEngineeringStainless steel material
An apparatus for the transport and storage of proppant has a container with a top wall, a pair of end walls and a pair of side walls. The pair of side walls extend between the pair of end walls. The container has a bottom discharge opening. The container includes a funnel extending from the pair of side walls and from the pair of and walls toward the bottom discharge opening. The funnel has sides extending in an angle of greater than 25° with respect to horizontal. The funnel includes a pair of side plates extending respectively from the pair of side walls toward the bottom discharge opening and a pair of end plates extending respectively from the pair of end walls toward the bottom discharge opening. Each of the side plates and the end plates is formed of a stainless steel material.
Owner:SANDBOX ENTERPRISES LLC
Austenitic stainless steel
ActiveCN101194037APrevent peelingIncreased durabilityHeat exchange apparatusRare-earth elementSS - Stainless steel
Even after repeated high-temperature heating-cooling cycles, it still has excellent scale peeling resistance that can inhibit the peeling of protective oxide scales formed on the steel surface, and can be used in high temperature, especially high temperature humidified gas environments above 1023K. System stainless steel with the following steel composition: C: 0.01-0.15%, Si: 0.01-3%, Mn: 0.01-2%, Cu: 0.1-2.5%, Cr: 23-30%, Ni: 16-25% , Al: 0.005 to 0.20%, N: 0.001 to 0.40%, P: 0.04% or less, S: 0.01% or less, and one or more rare earth elements selected from the Y and Ln groups: total 0.005 to 0.1%, the balance is substantially composed of Fe and unavoidable impurities, and the inclusions containing Y and Ln group elements on the steel surface are 5×10-3 / μm2 or less.
Owner:NIPPON STEEL CORP
316L stainless steel powder for 3D printing technology and preparation method thereof
ActiveCN105537582AIncrease profitIncrease superheatAdditive manufacturing apparatusTransportation and packagingManufacturing technologyGranularity
The invention relates to 316L stainless steel powder for the 3D printing technology and a preparation method thereof. The vacuum melting technology is adopted for the method, an ultrasonic vibration and air flow classification method is used for matching powder of different granularities, and the 316L stainless steel powder suitable for the 3D printing technology of different types of metal is prepared through the vacuum degassing technology. Compared with the prior art, the 316L stainless steel powder has the advantages of being high in sphericity degree, uniform in granularity distribution, low in oxygen content, low in impurity content, capable of meeting performance requirements of different 3D printing technologies for powder material and promoting the development of the metal material increasing manufacturing technology and the like.
Owner:SHANGHAI RES INST OF MATERIALS CO LTD +1
Austenitic-ferritic stainless steel with excellent formability
An austenitic-ferritic stainless steel having a low Ni content and a high N content is provided. A stainless steel which contains, in mass %, 0.2 % or less of C, 4 % or less of Si, 12 % or less of Mn, 0.1 % or less of P, 0.03 % or less of S, 15 to 35 % of Cr, 3 % or less of Ni, and 0.05 to 0.6 % of N, and is mainly composed of an austenite phase and a ferrite phase, wherein the proportion of said austenite phase is 10 to 85 volume %. The above austenitic-ferritic stainless steel exhibits good formability and high punch stretch formability, and is excellent in the resistance to crevice corrosion, to the corrosion of a welded zone and to intergranular corrosion. The above austenitic-ferritic stainless steel wherein the austenite phase contains C and N in a total amount of 0.16 to 2 mass % exhibits further improved formability.
Owner:JFE STEEL CORP
Austenitic free-cutting stainless steel
The present invention relates to an austenitic free-cutting stainless steel, containing: by weight percent, 0.500% or less of C; 0.01 to 5.00% of Si; 0.01 to 10.00% of Mn; 5.00 to 25.00% of Ni; 7.50 to 30.00% of Cr; 0.300% or less of N; more than 0.0100% but not more than 0.1000% of 0; 0.0020 to 0.1000% of B; 0.300% or less of Al; and the remainder of Fe and inevitable impurities, the steel satisfying the following formula (1): 0.68<=[O] / [B]<=2.50 (1) in which [O] represents the content of O and [B] represents the content of B.
Owner:DAIDO STEEL CO LTD
Method of manufacturing an assembly of brazed dissimilar metal components
InactiveUS6503640B2Improve abilitiesHigh strengthBuilding componentsElectron beam welding apparatusTitanium coatingSS - Stainless steel
Owner:DANA CANADA CORP
Cold-rolled double-surface stainless steel composite plate having excellent comprehensive performances and manufacturing method
ActiveCN105296854AUniform tissueNo surface yield pattern defectsMetal rolling arrangementsRoom temperatureComposite plate
The invention discloses a cold-rolled double-surface stainless steel composite plate having excellent comprehensive performances and a manufacturing method. The composite plate comprises a basal plate and a compound plate, wherein the upper and lower surfaces of the basal plate are wholly and continuously coated with the compound plate; the basal plate and the compound plate are formed to the cold-rolled double-surface stainless steel composite plate through an atomic diffusion metallurgical bonding method, wherein the basal plate is ultralow carbon aluminum killed steel; and the compound plate is 304 type austenitic stainless steel. The prepared cold-rolled double-surface stainless steel composite plate is excellent in surface quality and uniform in base material structure of carbon steel, has the room-temperature elongation above 45%, is excellent in corrosion resistance and stable in material performance, has the use performance of pure stainless steel, can largely reduce the cost, can serve as a substitute good of 304 stainless steel, and is widely applied to decoration panels and fields with higher forming requirements.
Owner:BAOSTEEL DESHENG STAINLESS STEEL +1
Ultra-low loadings of Au for stainless steel bipolar plates
InactiveUS6866958B2Avoid corrosionPoor adhesionElectrode carriers/collectorsVacuum evaporation coatingFuel cellsConductive coating
An electrically conductive fluid distribution element for a fuel cell which comprises an electrically conductive substrate, a flow field for distributing fluid along a surface of the substrate, and an electrically conductive coating on the surface which comprises a noble metal, desirably Ru, Rh, Pd, Ag, Ir, Pt, Os, and preferably Au.
Owner:GM GLOBAL TECH OPERATIONS LLC
Production technology for inhibiting nickel-saving austenitic stainless steel hot-rolled plate edge crack
InactiveCN101947549AImprove plasticityEliminate edge cracksTemperature control deviceHeat treatment process controlSS - Stainless steelHeating temperature
The invention relates to production technology for inhibiting nickel-saving austenitic stainless steel hot-rolled plate edge crack, which comprises the following steps of: smelting and continuous casting, grinding plate blanks, heating blanks, rolling and the like. By controlling N content in steel below 0.13 percent, controlling Creq / Nieq within 1.35, controlling alpha-phase content in a casting blank texture within 4 percent, setting the reasonable heating temperature of plate blanks by combining on-site reality, and adopting the plate blank one-pass descaling box and frame final-pass descaling descaling technology, in particular the rolling technology of tightly combining hot-rolled rolling pass deformation and blank temperature, the production technology has the advantages of avoiding the edge crack of the produced stainless steel hot-rolled plates, obviously improving the yield, solving the problem of edge crack quality for steel coils in the rolling process through a steckel mill, guaranteeing the edge quality of the hot-rolled steel coils and improving the width yield of finished rolled plates.
Owner:SHANDONG TAISHAN STEEL GROUP
Process for welding duplex stainless steel
ActiveCN101972878AOvercome adverse defectsGood welding effectArc welding apparatusShielding gasPetrochemical
The invention relates to a process for welding duplex stainless steel, in particular to the process for welding the duplex stainless steel used for high-sulfur content refining equipment, highly-corrosive petrochemical equipment and pipelines, high-parameter power devices, and the chloridion-corroded environments of seawater and the like. In the process, a specific protective gas favorable for the welding of the duplex stainless steel is adopted, and simultaneously limited linear energy and inter-layer temperature are regulated in the welding process, so that the unfavorable defects of the conventional welding process can be overcome, and a metallographic structure with the ferrite content of 30 to 70 percent and a ferritic phase in percentage equivalent to that of an austenitic phase is obtained. A welding joint obtained by the welding process has high mechanical properties, high strength and hardness, particularly high yield strength which is about twice that of austenitic stainless steel, high thermal fatigue resistance, pitting corrosion resistance, crevice corrosion resistance, intercrystalline corrosion resistance and high weldability.
Owner:CHINA NAT CHEM ENG NO 7 CONSTR
Investment cast, stainless steel chain link and casting process therefor
ActiveUS20070107412A1Reduce tensionEliminate wear and tearFoundry mouldsSedimentation separationFree rotationInvestment casting
An investment cast, stainless steel chain link is provided for chains used in water and wastewater treatment. The chain link comprises a pair of spaced apart, elongated sidebars having forward ends and rearward ends. The forward ends are spread apart and are provided with outwardly and laterally extending bosses having transverse boss pin bores coaxially aligned with each other. The rearward ends are interconnected by a cylindrical barrel having a barrel pin bore extending through each of the sidebars. The sidebars are formed with outwardly and laterally projecting reinforcing ribs extending between the bosses and the barrel pin bore along a substantial length of the sidebars. A freely rotatable chain pin is inserted through aligned boss and barrel pin bores from either end thereof for interconnecting first and second pairs of sidebars. An arrangement is provided for preventing the lateral dislodgement of the chain pin from the sidebars.
Owner:HUMCKE MICHAEL W +1
Recycling harmless treatment method of stainless steel pickling waste water
ActiveCN102659274AHigh recovery rateSmall footprintSludge treatmentSolid waste disposalIndustrial waste waterSS - Stainless steel
The invention discloses a recycling harmless treatment method of stainless steel pickling waste water, belonging to the toxic and harmful industrial waste water treatment field. The method comprises the following steps of: 1) recycling inorganic acids by an acid separation method: pumping stainless steel pickling waste water in which suspended matters are removed through filtering into a resin column so that the inorganic acids are absorbed on the resin; 2) removing impurities by a goethite method: pumping heavy metal ion solution into a reaction kettle, adjusting pH to a range from 3.5 to 5.0, and continuing reacting for 30-90 min, thereby removing iron, chromium and fluorine in the heavy metal ion solution in the form of dregs; 3) recycling nickel by a neutralized sedimentation method: feeding an alkaline liquor to nickel solution to adjust pH to a range from 9.5 to 12.5, and filtering and washing the filter residues, thereby obtaining nickelous hydroxide; and 4) performing harmlesstreatment on the dregs: after washing the dregs, adding lime powder to the dregs to realize stabilization treatment of harmful elements. The method is simple in operation and convenient for management; the high-concentration inorganic acids and nickel and the like contained in the waste water are all recycled, and simultaneously the generated dregs are harmlessly treated; and therefore the integration of economic benefit,environmental benefit and social benefit is realized.
Owner:NANJING UNIV
Ultrapurification high nitrogen austenitic stainless steel and its preparation method
A superpure high-nitrogen stainless austenite steel contains Cr (17-19 wt.%), Mn (12-16 wt.%), Mo (2-3 wt.%), Cu (0.5-1.5 wt.%), Ni (0-0.2 wt.%), N (0.4-0.6 wt.%), C (0-0.05 wt.%), Si (0-0.5 wt.%), S (0-0.009 wt.%), P (0-0.009 wt.%) and Fe (rest). It is smelted by vacuum induction furnace, where nitrogen is added in FeCrN, CrN or MnN mode.
Owner:INST OF METAL RESEARCH - CHINESE ACAD OF SCI
High performance coated material with improved metal dusting corrosion resistance
InactiveUS20080020216A1Improve the immunityReduce carbon depositionAnodisationLiquid surface applicatorsMulliteInconel
High performance coated metal compositions resistant to metal dusting corrosion and methods of providing such compositions are provided by the present invention. The coated metal compositions are represented by the structure (PQR), wherein P is an oxide layer at the surface of (PQR), Q is a coating metal layer interposed between P and R, and R is a base metal. P includes alumina, chromia, silica, mullite or mixtures thereof. Q includes Ni and Al, and at least one element selected from the group consisting of Cr, Si, Mn, Fe, Co, B, C, N, P, Ga, Ge, As, In, Sn, Sb, Pb, Sc, La, Y, Ce, Ti, Zr, Hf, V, Nb, Ta, Mo, W, Ru, Rh, Ir, Pd, Pt, Cu, Ag, Au and mixtures thereof. R is selected from the group consisting of carbon steels, low chromium steels, ferritic stainless steels, austenetic stainless steels, duplex stainless steels, Inconel alloys, Incoloy alloys, Fe—Ni based alloys, Ni-based alloys and Co-based alloys. Advantages exhibited by the disclosed coated metal compositions include improved metal dusting corrosion resistance at high temperatures in carbon-supersaturated environments having relatively low oxygen partial pressures. The coated metal compositions are suitable for use in syngas generation process equipment.
Owner:EXXON RES & ENG CO
Composite surface on a stainless steel matrix
A composite surface having a thickness from 10 to 5,000 microns comprising a spinel of the formula MnxCr3−xO4 wherein x is from 0.5 to 2 and oxides of Mn, Si selected from the group consisting of MnO, MnSiO3, Mn2SiO4 and mixtures thereof which are not prone to coking and are suitable for hydrocarbyl reactions such as furnace tubes for cracking.
Owner:NOVA CHEM (INT) SA
Embedded material of austenitic stainless steel in medical use
InactiveCN1519387AImprove wear and corrosion resistanceExcellent strength and toughness combinationProsthesisManganeseSS - Stainless steel
A stainless austenite steel for medical implantation contains Cr(17-22 wt.%), Mn (12-20 wt.%), Mo (1-3 wt.%), Cu (0.5-1.5 wt.%), N (0.4-0.7 wt.%), Ni (0-0.02 wt.%), C (0-0.03 wt.%), Si (0-0.75 wt.%), S (0-0.01 wt.%), P (0-0.025 wt.%) and Fe (rest). It is smelted by vacuum induction furnace. Its advantage is very low content of toxic Ni.
Owner:INST OF METAL RESEARCH - CHINESE ACAD OF SCI
Austenitic stainless steel tube excellent in steam oxidation resistance and a manufacturing method thereof
ActiveUS20030231976A1Excellent in steam oxidation resistanceFurnace typesHeat treatment furnacesAustenite grainReduction ratio
The present invention provides an austenitic stainless steel tube with a uniform fine grained structure of regular grains, which is not changed to a coarse structure and the steam oxidation resistance is maintained even if the tube is subjected to a high temperature reheating during welding and high temperature bending working. The austenitic stainless steel tube consists of, by mass %, C: 0.03-0.12%, Si: 0.1-0.9%, Mn: 0.1-2%, Cr: 15-22%, Ni: 8-15%, Ti: 0.002-0.05%, Nb: 0.3-1.5%, sol. Al: 0.0005-0.03%, N: 0.005-0.2% and O (oxygen): 0.001-0.008%, and the balance Fe and impurities, the austenitic stainless steel tube having austenitic grain size number of 7 or more and a mixed grain ratio of preferably 10% or less. The present invention also provide a method of manufacturing the austenitic stainless steel tube comprising the following steps: (a) heating an austenitic steel tube at 1100-1350° C. and maintaining the temperature, and cooling at a cooling ratio of 0.25° C. / sec; (b) working by cross-sectional reduction ratio of 10% or more at a temperature range of 500° C. or less; and (c) heating at a temperature range of 1050-1300° C. and at a temperature of lower by 10° C. or more than the heating temperature in the step(a).
Owner:NIPPON STEEL CORP
Direct touch type metal diaphragm valve
ActiveUS20100090151A1Reduce replacement timeAchieve stabilityDiaphragm valvesOperating means/releasing devices for valvesDirect touchEngineering
A direct touch type metal diaphragm valve, wherein durability of the valve, that is to say, the ensured number of continuous open / close operations of the valve, is substantially increased under conditions that an appropriate flow rate coefficient Cv is maintained, and changes of the afore-mentioned Cv value over time are mitigated by means of restricting the deformation of the valve seat over time. The afore-mentioned metal diaphragm is formed in a round, reverse-dish shape by laminating a plural number of thin stainless steel plates and a thin Nickel.Cobalt alloy plate, and its center part is bulged upward, and the maximum valve stroke of the valve is regulated to be 55% to 70% of the distance of the maximum bulge height Δh of the afore-mentioned metal diaphragm.
Owner:FUJIKIN INC
Ni-Cr-Fe alloy and its production process
InactiveCN1847440ASave resourcesOptimize the smelting processBlast furnace detailsRecycling and recovery technologiesGranularityManganese
The present invention is Ni-Cr-Fe alloy and its production process. The Ni-Cr-Fe alloy contains Ni 1.5-6.0 wt%, Cr 3.0-21.0 wt%, Si 0.6-2.0 wt% and Mn 0.3-0.8 wt%, except Fe, and can meet the requirement for use as material smelting stainless steel. The production process includes the following steps: producing Ni-Cr agglomerate with industrial Ni-Cr waste, Ni-Cr ore powder of granularity smaller than 10 mm, flux, coke and water and through pelletizing, sintering and sieving; and smelting with the Ni-Cr agglomerate, Ni-Cr ore of granularity greater than 10 mm, flux and coke in a blast furnace. The present invention has sang in resource and environment friendship.
Owner:DONGDA CASTING WUJIANG
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