243results about How to "Excellent hole expandability" patented technology

The present invention relates to a pseudothin diaspore composition containing organic pore-expanding agent. Said composition contains 92-99.5 wt% of pseudothin diaspore and 0.5-8 wt% of organic pore-expanding agent, in which the crystallinity of pseudothin diaspore is 10-70%. In the pseudothin diaspore composition provided by said invention the organic pore-expanding agent content is low, after high-temperature calcination the alumina with large pore capacity and large pore diameter can be obtained. Said alumina can be used as carrier material for preparing hydrodemetalization catalyst for heavy oil, residual oil and short residuum specially.

The present invention provides high strength thin-gauge steel sheet with excellent elongation and hole expandability having a tensile strength of 500 MPa or more and a method of production of high strength thin-gauge steel sheet with excellent elongation and hole expandability enabling production of this on an industrial scale, that is, high strength thin-gauge steel sheet comprised of, by mass %, C: 0.03 to 0.25%, Si: 0.4 to 2.0%, Mn: 0.8 to 3.1%, P≦0.02%, S≦0.02%, Al≦2.0%, N≦0.01%, and a balance of Fe and unavoidable impurities and having a microstructure comprised of ferrite with an area fraction of 10 to 85% and residual austenite with a volume fraction of 1 to 10%, an area fraction of 10% to 60% of tempered martensite, and a balance of bainite.

The invention provides a high-strength cold-rolled steel sheet having a TS of 1,180 MPa or greater and excellent workability, such as stretch flange workability and bendability. Also provided are a molten galvanized high-strength steel sheet, and a method for producing the same. The high-strength cold-rolled steel sheet having excellent workability has a composition that comprises, by mass%, C: 0.05 to 0.3, Si: 0.5 to 2.5, Mn: 1.5 to 3.5, P: 0.001 to 0.05, S: 0.0001 to 0.01, Al: 0.001 to 0.1, N: 0.0005 to 0.01, and Cr: 1.5 or less (including 0) and satisfies formulas (1) and (2), with the balance being Fe and inevitable impurities. The steel sheet has a microtexture wherein there is a ferrite phase and a martensite phase, the percentage of the texture total surface area occupied by martensite phase is 30% or greater, (the surface area occupied by martensite phase)/(surface area occupied by ferrite phase) exceeds 0.45 but is less than 1.5, and the average particle diameter of the martensite phase is 2 microns or larger. [C]1/2*([Mn]+0.6*[Cr])>/=1-0.12*[Si] (1), and 550-350*C*-40*[Mn]-20*[Cr]+30*[Al]>/=340 (2), wherein C*=[C]/(1.3*[C]+0.4*[Mn]+0.45*[Cr]-0.75).

The present invention is macroporous alumina carrier and its preparation process. The carrier has pore volume of 0.9-1.3 ml/g, pore volume rate of pores smaller than 20 nm in 55-85 %, pore volume rate of 20-100 nm diameter pores in 7-25 %, and pore volume rate of pores greater than 100 nm in 7-25 %. The preparation process of the carrier includes forming and roasting pseudo-thin diasphore composition containing organic pore expanding agent. The preparation process of the present invention has relatively low organic pore expanding agent consumption and high pore expanding effect. The prepared macroporous alumina carrier is used in catalyst for hydrogenating and demetallating heavy and residual oil, especially decompression residual oil with high metal content.

The invention provides a 780 MPa hot-rolled high-strength steel with high hole expansion ratio and a manufacturing method thereof. The 780 MPa hot-rolled high-strength steel with high hole expansion ratio comprises the following chemical components in percentage by mass: more than or equal to 0.03 percent and less than or equal to 0.07 percent of C, less than or equal to 0.2 percent of Si, more than or equal to 1.0 percent and less than or equal to 2.0 percent of Mn, less than or equal to 0.02 percent of P, less than or equal to 0.005 percent of S, more than or equal to 0.02 percent and less than or equal to 0.05 percent of Al, less than or equal to 0.005 percent of N, more than or equal to 0.08 percent and less than or equal to 0.20 percent of Ti, more than or equal to 0.15 percent and less than or equal to 0.25 percent of Mo, less than or equal to 0.003 percent of O and the balance of Fe and inevitable impurity elements, wherein Ti/Mo is more than or equal to 0.25 and less than or equal to 1.5, and (Ti-3.42N)/4+Mo/8 is more than or equal to 0.03 percent and less than or equal to 0.07 percent. The 780 MPa hot-rolled high-strength steel with high hole expansion ratio is obtained through smelting, casting, high-temperature heating, hot rolling and reeling processes, and is more than or equal to 750 MPa in yield strength, more than or equal to 780 MPa in tensile strength, more than or equal to 20 percent in extensibility, more than or equal to 70 percent in hole expansion ratio when the thickness is 3-6 mm.

The invention provides an alumina carrier, wherein the average pore diameter of the alumina carrier is 25-35nm; the most probable pore diameter is 21-30nm; and the volume of pores with diameters of 10-60nm is 95-99.8% of the volume of total pores. The invention also provides a preparation method of the alumina carrier, comprising the steps of carrying out molding, drying and roasting on a mixture containing hydrated alumina and water, wherein the hydrated alumina contains pseudo-boehmite and ammonium aluminium carbonate hydroxide. The invention also provides a hydrogenation catalyst containing the alumina carrier and a preparation method thereof. The pore diameters of the alumina carrier provided by the invention are increased, therefore, the abilities of removing and accommodating metals of the hydrogenation catalyst containing the alumina carrier are improved and the hydrogenation catalyst is suitable for hydrogenation and demetalization treatments of inferior residual oil with higher metal content.

The present invention provides a hot dip galvanized composite high strength steel sheet excellent in shapeability and hole enlargement ability and a method of production of the same, that is, a hot dip galvanized composite high strength steel sheet excellent in shapeability and hole enlargement ability containing C: 0.01 to 0.3%, Si: 0.005 to 0.6%, Mn: 0.1 to 3.3%, P: 0.001 to 0.06%, S: 0.001 to 0.01%, Al: 0.01 to 1.8%, and N: 0.0005 to 0.01% and having a metal structure of ferrite and, by area rate, 5% to 60% of tempered martensite and a method of production of the same comprising hot rolling, then cold rolling a slab including the above ingredients, heating the sheet in the hot dip galvanization heating process to Ac_{1 l to Ac3}+100° C., holding it there for 30 seconds to 30 minutes, then cooling it by a 1° C./s or higher cooling rate to 450 to 600° C., hot dip galvanizing it at that temperature, then cooling it at a 1° C./s or higher cooling rate to the martensite transformation point or lower in temperature, holding it there at 200° C. to 500° C. for 1 second to 5 minutes, then cooling it at a 5° C./s or higher cooling rate to 100° C. or less.

Provided is a high-strength steel plate having excellent hole expandability as well as stability of material properties, and a method for manufacturing the same, the high-strength steel plate having a TS of at least 780 MPa and a TS*EL of at least 22,000 MPa DEG % in a low-C steel composition. The high-strength steel plate having excellent formability and stability of material properties has an ingredient composition including, in terms of mass%, 0.03%-0.25% C, 0.4%-2.5% Si, 3.5%-10.0% Mn, 0.1% or less P, 0.01% or less S, 0.01%-2.5% Al, 0.008% or less N, and Si+Al at least 1.0%, the remainder being Fe and unavoidable impurities, the steel structure having, by area ratio, 30%-80% ferrite, 0%-17% martensite, and, by volume ratio, 8% or more of residual austenite, and the average crystalline particle diameter of the residual austenite being 2[mu]m or less.

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 relates to a high-strength cold-rolled steel sheet of excellent bending workability and hole-expanding property. The high-strength cold-rolled steel sheet comprises the following components in weight percentage: 0.06 to 0.1% of C, 0.05 to 0.5% of Si, 2.0 to 2.5% of Mn, 0.001 to 0.10% of P, 0.010% or less of S, 0.01 to 0.10% of soluble Al, 0.010% or less of N, more than one selected from 0.003 to 0.08% of Ti and Nb, the balance of Fe and impurities. The fine structure of the steel material is composed of 40% or less of martensite, 30 to 40% of bainite and 20 to 30% of ferrite in area percentage. The hardness ratio of bainite to ferrite is over 0.7. The ferrite contains precipitates, wherein the density of the precipitates is 1.5*10<6> per mm2 and the size of the precipitates is smaller than 10 nm. In this way, the hardness ratio of bainite to ferrite is 2 or less.

The present invention provides hot dip galvanized high strength steel sheet excellent in plating adhesion and hole expandability and a method of production of the same, that is, hot dip galvanization steel sheet excellent in plating adhesion and hole expandability containing, by mass%, C: 0.08 to 0.35%, Si: 1.0% or less, Mn: 0.8 to 3.5%, P: 0.03% or less, S: 0.03% or less, Al: 0.25 to 1.8%, Mo: 0.05 to 0.35%, and N: 0.010% or less and having a balance of Fe and unavoidable impurities, said hot dip galvanized high strength steel characterized in that the steel sheet has a metal structure having ferrite, bainite, by area percent, 0.5% to 10% of tempered martensite, and, by volume percent, 5% or more of residual austenite, and a method of production comprising annealing by a continuous annealing process at 680 to 930 DEG C in temperature, then cooling to the martensite transformation point or less, then hot dip galvanizing the steel during which heating the steel to 250 to 600 DEG C, then hot dip galvanizing it.

The invention relates to an ultrahigh strength hot-rolled complex phase steel plate and a production method thereof. The ultrahigh strength hot-rolled complex phase steel plate comprises the followingchemical components of, by weight percentage, 0.05-0.15% of C, 0.1-0.8% of Si, 1.2-2.3% of Mn, no more than 0.012% of P, no more than 0.005% of S, 0.20-0.70% of Cr, 0.10-0.50% of Mo, 0.02-0.06% of Nb, 0.05-0.13% of Ti, 0.015-0.060% of Als and the balance Fe and inevitable impurities. The ultrahigh strength hot-rolled complex phase steel plate has the advantages that by controlling rolling and cooling, the effects of fine-grain strengthening, phase transformation strengthening and precipitation strengthening are comprehensively utilized, and the purposes that the high-strength performance of materials is maintained, the microhardness difference between two phases is reduced through precipitation strengthening, and the performance of chambering is improved are achieved.

Provided are 1180 MPa-grade precipitation strengthened hot rolled ultra-high-strength steel and a manufacturing method thereof. The steel is prepared from, by weight, C 0.10-0.20%, Mn 1.5-2.0%, P smaller than or equal to 0.015%, S smaller than or equal to 0.005%, Al 0.02-0.08%, N smaller than or equal to 0.005%, O smaller than or equal to 0.003%, Ti 0.10-0.20%, Nb 0.03-0.06%, V 0.20-0.40% and the balance Fe and inevitable impurities, and meanwhile the conditions required to be met are as follows: the sum of Nb and Ti is greater than or equal to 0.16% but is smaller than or equal to 0.23%, and (Ti-3.42N-3S)/4+V/4.24+Nb/7.74 is greater than or equal to 0.065% but is smaller than or equal to 0.15%. The microstructure of the steel is ferrite, bainite and nanoscale precipitation carbide, wherein the equivalent grain size of the ferrite is smaller than or equal to 5 microns, the width of bainite battens is smaller than or equal to 0.5 micron, the tensile strength of the bainite battens is greater than or equal to 1180 MPa, the elongation is greater than or equal to 15%, the hole expansion rate is greater than or equal to 30%, and excellent strength, plasticity and burring matching are shown.

The invention discloses a hydrogenation and metal removing catalyst preparation method, which comprises: (1) impregnating a physical pore expanding agent by using a silicon-containing solution, carrying out mixing kneading on the physical pore expanding agent, pseudo-boehmite, an auxiliary extrusion agent and a glue solvent after the impregnating to form a plastic body, extruding strips, drying, calcining the dried material in a nitrogen atmosphere, and then calcining in an air atmosphere to produce a silica-containing alumina carrier; and (2) impregnating the carrier by using a hydrogenation activity component impregnating liquid, drying the material, and calcining to prepare the hydrogenation and metal removing catalyst. According to the present invention, the catalyst prepared through the method has advantages of high mechanical strength, suitable pore structure, high catalytic activity, and high activity stability.

The invention discloses high-ductility and high-formability cold-rolled DH590 steel and a production method thereof. The steel comprises 0.08%-0.14% of C, 1.2%-2.2% of Mn, 0.35%-0.75% of Si, 0.02%-0.50% of Al, 0.03%-0.45% of Cr, 0.02%-0.25% of Mo, 0-0.01% of P, 0-0.01% of S, 0-0.03% of Nb and the balance iron and inevitable impurities. The heating temperature of a casting blank is 1200-1300 DEG C,the initial rolling temperature is 1100-1180 DEG C, the final rolling temperature is higher than or equal to 910 DEG C, and the coiling temperature is 550-700 DEG C; the cold rolling reduction rate is 50%-90%; the continuous annealing temperature is 750-850 DEG C, the annealing time is 10-600S, the slow cooling outlet temperature is 660-730 DEG C, the rapid cooling rate is higher than 20 DEG C/S,the rapid cooling outlet temperature is 300-420 DEG C, the overaging temperature is 300-420 DEG C, and the overaging time is 30-3600S; and the finishing elongation is 0.3%-0.6%. A finished steel plate has high ductility and high formability.

The invention discloses an ultrafine-grain hot-rolling dual phase steel plate for automobiles and a production method thereof. The chemical constituent of the steel plate comprises, by mass, 0.07%-0.09% of C, 0.2%-0.5% of Si, 1.3%-1.5% of Mn, 0.03%-0.05% of Nb, less than 0.02% of P, and less than 0.01% of S, and the balance being iron and ineluctable impurities, wherein the volume fraction of ferrite is between 60% and 80%, the volume fraction of bainite is between 20% and 40%, the average grain diameter is between 2-3 mu m. The production method comprises that: continuous casting blanks are heated to 1150-1300 DEG C and insulated for 2-3 h. The rolling temperature is between 1100-1200 DEG C and the finishing temperature>950 DEG C during rough rolling. During finish rolling, the initial rolling temperature is between 890-950 DEG C and the final rolling temperature>800 DEG C. A laminar flow cooling technology is utilized and rapid cooling is carried out. The cooling speed is controlled between 25-35 DEG C/s and coiling is carried out when the temperature is between 400-450 DEG C finally. The steel plate and the production method thereof have the advantages of low cost without adding noble metals such as Cr, Mo; simple technology without subsection cooling, easy production control; uniform and consistent product performance and good formability. The steel plate and the production method thereof are mainly used for stamping workpieces of automobile wheels and girders.

A hot-rolled steel sheet includes a chemical composition represented by, in mass %, C: 0.010% to 0.100%, Si: 0.30% or less, Cr: 0.05% to 1.00%, Nb: 0.003% to 0.050%, Ti: 0.003% to 0.200% and others, wherein a proportion of grains having an intragranular misorientation of 5° to 14° in all grains is 20% or more by area ratio, the grain being defined as an area which is surrounded by a boundary having a misorientation of 15° or more and has a circle-equivalent diameter of 0.3 μm or more.

This invention Provides a hot-rolled high strength thin steel sheet which is excellent in hole expansibility, ductility and chemical treatment characteristics. Said steel sheet has a chemical composition, in mass %: C: 0.02 to 0.08 %, Si: 0.50 % or less, Mn: 0.50 to 3.50 %, P: 0.03 % or less, S: 0.01 % or less, Al: 0.15 to 2.0 %, and the balance: Fe and inevitable impurities, with the proviso that the formula: Mn + 0.5 X Al < 4 is satisfied, and has a metal structure wherein ferrite having a particle size of 2 Mum or more accounts for 40 area % or more. The thin steel sheet has a tensile strength of 590 N/mm<2> or more.

The invention relates to a cold-rolled CP980 steel with different yield strength grades and a production method thereof. The method comprises a billet heating process, a hot rolling procedure, an acidrolling procedure, a continuous annealing and leveling procedure, and through reasonable component design and effectively controlling key process parameters of each process section, the cold rolled CP980 steel products with two yield strength grades of 770-840 MPa and 860-930 MPa can be produced by using a component system, steel product which has the yield strength grade of 770-840 MPa has hightensile strength and good plasticity, and is particularly suitable for safety part manufacturing which requires 980 MPa grade and has good impact resistance; the steel product which has the yield strength grade of 860-930 MPa has high yield strength and tensile strength, good extensibility and excellent reaming performance, and is particularly suitable for manufacturing complex automobile parts requiring 980 MPa grade and has special requirements such as flanging, reaming.