36results about How to "Has a yield strength" patented technology

The invention provides a deep drawing hot-dipped al-zn steel plate / strip and a production method thereof. The deep drawing hot-dipped al-zn steel plate / strip comprises an IF steel substrate and an alloy coating and the chemical constituents of the substrate (wt percent) are that C is less than or equal to 0.01, Si is less than or equal to 0.12, Mn is less than or equal to 0.6, P is less than or equal to 0.1, S is less than or equal to 0.045, Ti is less than or equal to 0.3 and the allowance is Fe and inevitable impurities. The production method comprises substrate degreasing treatment, annealing treatment and hot dipping, and the annealing treatment is carried out in a continuous annealing furnace and protective gas contents in the annealing furnace are 10 to 60 percent. The yield strength of the steel plate / strip of the invention reaches 140 to 220 MPa, the tensile strength is 260 to 350 MPa and the elongation is more than 30 percent; the production method of the invention is simple in production process and strong in operability.

In producing a steel sheet for cans, a steel sheet which consists substantially of ferrite single-phase structure and has a mean grain diameter of 7[mu]m or below and which exhibits a yield strength of 500MPa or above, a yield ratio of 0.9 or above, a total elongation of 10% or above, and deltar of -0.50 to 0 after coating and baking is produced by incorporating C: 0.01 to 0.12%, Si: 0.005 to 0.5%, Mn: 0.3 to 1.5%, P: 0.005 to 0.2%, Al: 0.10% or below, N: 0.012% or below, and Nb: 0.005 to 0.10% and combining solid solution hardening, precipitation hardening, and grain refinement hardening. The hot rolling is conducted principally under the conditions of FT of 870 DEG C or above, cooling rate after hot rolling of 40 DEG C / s or below, and CT of 620 DEG C or above to adjust the mean grain size of a hot-rolled sheet serving as material for the steel sheet for cans to 6[mu]m or above.

The invention discloses a method for preparing a centrifugal nodular cast iron pipe. The method discloses the preparation process of the centrifugal nodular cast iron pipe of high quality, the preparation process comprises a series of operation processes of molten iron preparation, nodulizing of molten iron, centrifugal casting, annealing treatment, pipe body shaping and coating protection and the like. The method is suitable for preparation of cast iron pipes of the specification of DN 80-1000 mm, the application range is wide, and the preparation process is simple. The cast iron pipe prepared through the method has the characteristics of being high in appearance quality, fine in material structure, high in production efficiency, long in service life and the like, and compared with existing steel pipes and gray iron pipes, the cast iron pipe prepared through the method has better decay resistance and tensile property.

The invention relates to a manufacturing method for a seamless pipe, and in particular to a manufacturing method for a high manganese steel seamless pipe with high strength and corrosion resistance. The manufacturing method for the high manganese steel seamless pipe comprises the following steps that a high manganese steel ingot comprising, by weight percentage (%), 0.08-0.60% of C, 0.10-3.60% of Si, 15.00-28.00% of Mn, 0.02-4.50% of Al, no more than 0.045% of P, no more than 0.045% of S, 0.01-0.30% of Nb, 0.001-0.040% of N, 0.01-0.20% of Ti, 0.01-0.20% of V, and the balance Fe and inevitable impurities is kept warm for 6-8 hours at the temperature of 1150-1250 DEG C, the steel ingot is hot-forged into a cylindrical blank at the temperature of 850-1150 DEG C, then the cylindrical blank is covered with a heat preservation cover quickly for slow cooling, and the cylindrical blank is air-cooled to the room temperature 48 hours later by hoisting the cover away.

The invention discloses pressure resistance and pressure relief bricks for a coal mine underground seal wall and a construction method of the seal wall. The pressure resistance and pressure relief bricks are formed by ceramsite and bounding agent; the bounding agent is formed by multi-iso-cyanogens phenol resin and polyester polyol; a weight ratio of the iso-cyanogens phenol resin and the polyester polyol is 1: 0.8 to 1: 1.2; and a weight ratio of the ceramsite and the bounding agent is 1: 1 to 1: 1.5. The construction method of the seal wall comprises adding a sand and rock bedding layer to a catching groove of the bottom face of a tunnel which is under the seal wall and performing construction above the sand and rock bedding layer with one or two layers of pressure resistance and pressure relief bricks; constructing a main wall body of the seal wall with red bricks; and constructing the connecting positions of the lateral side and the top face of the tunnel and the seal wall with one or two layers of pressure resistance and pressure relief bricks. When pressure is performed on the tunnel, the pressure resistance and pressure relief bricks well absorb the pressure due to the capability of contracting and deforming to be a half; accordingly the service life of the seal wall is prolonged; maintaining times of the seal wall are reduced; and the pressure resistance and pressure relief bricks can be reused to reduce the construction cost and maintenance cost of the seal wall.

The invention discloses an industrial preparing method of a water-cooling metal mold centrifugal nodular cast iron pipe. According to the method, pig iron is used, the technologies of molten iron preparing, molten iron nodulizing, centrifugal casting, annealing, shaping and coating are carried out, and then the finished cast iron pipe is obtained. The preparing method is suitable for preparing the high-quality metal mold centrifugal nodular cast iron pipe of DN80-1000 mm. The preparing process comprises a series of operation procedures such as molten iron preparing, molten iron nodulizing, centrifugal casting, annealing, shaping and coating, the preparing technology is simple, the prepared cast iron pipe has the advantages of being high in appearance quality, fine in material structure, high in production efficiency, long in service life and the like, and compared with an existing steel pipe and an existing gray iron pipe, the water-cooling metal mold centrifugal nodular cast iron pipe has better corrosion-resisting performance and tensile performance.

An expandable valved catheter for pediatric right ventricular outflow tract (RVOT) reconstruction is disclosed. Valved catheters can provide long-term patency and resistance to thrombus and stenosis. The valved catheter can expand radially and / or longitudinally to accommodate the growing anatomy of the patient. Further, methods are disclosed for the production of valvated catheters based in part on plastically deformable biocompatible polymers, as well as computer-optimized valve designs developed for such expandable valvated catheters.

The invention provides a heat treatment method for spray forming of a 7055 aluminium alloy. The heat treatment method includes the following steps of two-stage solid solution, retrogression low temperature reageing treatment, underaging pretreatment, regression treatment and low temperature reageing treatment. The two-stage solid solution comprises first-stage solid solution and second-stage solidsolution. Underaging is used as pretreatment before regression treatment, the number of eta phases in an alloy matrix is controlled, only a small amount of the eta phases are generated in the matrix,and thus it is guaranteed that the material has certain yield strength, subsequent regression treatment redissolves most of the GP regions in the matrix into the matrix, and the organization is prepared for a large number of dispersed GP regions precipitated by low temperature reaging. Meanwhile, regression treatment also avoids the aging process needing to take a long time to strengthen the phases in a single GP region to achieve the high strength and toughness of the 7055 aluminum alloy.

The invention provides 125ksi anti-hydrogen sulfide stress corrosion high-strength oil casing steel and a preparation process thereof. The chemical components (% by mass) of the steel used in the present invention are as follows: 0.08-0.27% of C, 0.1-0.5% of Si, 0.15-1.8% of Mn, 0.3-1.0% of Cr, 0.4-1.0% of Mo, 0.05-0.4% of V, 0.01-0.1% of Ti, 0.1-0.7% of Cu, 0.2-3.0% of Ni, 0.0001-0.002% of B, 0-0.015% of P, 0-0.010% of S, 0-0.06% of O, 0-0.05% of N, 0-0.05% of H and the balance comprising Fe and unavoidable impurities. The yield strength of the steel grade is 862-1034 MPa, thereby meeting theinternational standard for anti-hydrogen sulfide stress corrosion NACE-A test requirements.

High strength aluminum alloys and methods of making and processing such alloys are disclosed. More specifically, aluminum alloys exhibiting improved mechanical strength are disclosed. The processing method includes homogenization, hot rolling, solutionization and multi-step quenching. In some cases, the processing step may further comprise annealing and / or cold rolling.

The invention provides a deformed aluminum alloy, the composition of which comprises: 5.5% to 6.0% by weight of Zn; 2.0% to 2.5% by weight of Mg; 0.2% to 0.6% by weight of Cu; 0.1% to 0.2% by weight Cr of 0.2 wt% or less (greater than 0 wt%) Fe; 0.2 wt% or less (greater than 0 wt%) of Mn; 0.2 wt% or less (greater than 0 wt%) of Si; 0.1 wt% or less (greater than 0 wt%) %) of Ti; 0.05% by weight or less (greater than 0% by weight) of Sr; the balance being Al.

The invention belongs to the technical field of welding materials, and in particular relates to a gas-shielded solid welding wire for ultra-high-strength construction machinery steel plates, which comprises the following components in terms of mass percentage: C: 0.08-0.12%, Si: 0.70-0.90%, Mn: 1.65-1.85%, Cr: 0.45-0.65%, Ni: 2.3-2.5%, Mo: 0.40-0.70%, Ti: 0.08-0.15%, Zr: 0.04-0.08%, Nb: 0.05-0.10%, B : 0.004~0.006%, S: 0.005~0.015%, P≤0.010%, the balance is iron and unavoidable impurities. The present invention also provides the application of the above-mentioned gas-shielded solid welding wire, which is used for welding ultra-high-strength engineering machinery steel plates with a tensile strength of 960 MPa. The weld seam formed by welding with the solid welding wire provided by the invention has the advantages of good low-temperature impact toughness, low yield ratio, high strength, and beautiful shape; and the welding spatter is small, and the welding process performance is excellent; the use of argon-rich (80%Ar+20 %CO 2 ) gas shielded welding, the yield ratio of the deposited metal is ≤0.9, which is suitable for the welding of ultra-high-strength engineering machinery steel plates such as Q890 with a tensile strength of 960MPa.

The invention relates to a hot rolled steel plate with the honed yield strength of 400 MPa for counterenamel. The hot rolled steel plate is prepared from, by mass percent, 0.08% to 0.15% of C, not larger than 0.10% of Si, 1.0% to 2.0% of Mn, 0.060% to 0.10% of P, not larger than 0.006% of S, not larger than 0.008% of N, 0.02% to 0.08% of Ti, 0.010% to 0.045% of Als, 0.020% to 0.055% of V, 0.01% to0.05% of Nb, 0.15% to 0.30% of Mo and the balance Fe and inevitable impurities. When the thickness of the hot rolled steel plate is larger than or equal to 8 mm, 0.0005% to 0.005% of B is added. Thehoned yield strength of the hot rolled steel plate is larger than or equal to 400 MPa. The hot rolled steel plate has good scute burst resisting performance, meanwhile, the honed yield strength can reach 400 MPa or above, and the requirement of a large enamel assembling structure can be met better.