18results about How to "High yield ratio" patented technology

The invention provides a preparation method of a micro TiAl alloy wire, and relates to the technical field of TiAl alloy preparation. The preparation method comprises the steps of raw material selection and treatment of a wire material, raw material twisting of the wire material, continuous warm drawing of a primary TiAl composite stranded wire, twisting of the primary TiAl composite wire, continuous warm drawing of a secondary TiAl composite stranded wire, repeated warm drawing of the TiAl composite wire, continuous extrusion of the TiAl wire and diffusion homogenization of the TiAl alloy wire which are sequentially carried out. According to the preparation method, the TiAl alloy wire with uniformly distributed components can be directly prepared at a lower temperature by combining multiple wire twisting, multiple continuous hot drawing and final diffusion homogenization annealing, the high-temperature melting process is effectively avoided, the components and the diameter of the TiAl alloy wire can be designed according to the requirements of the target TiAl alloy wire for the passes in the preparation and extrusion process of the TiAl composite wire, and the preparation process of the TiAl alloy wire is simplified. The method is high in flexibility, simple to operate, wide in application, low in cost and very suitable for large-scale industrial production.

The ultra-high strength cold-rolled steel sheet of the present invention comprises, in wt%: 0.23 to 0.40 wt% of carbon (C); from 0.05 wt% to 1.0 wt% of silicon (Si); 0.5 wt% to 3.0 wt% of manganese (Mn); 0.01% to 0.12% by weight of vanadium (V); 0.01 wt% to 0.3 wt% of aluminum (Al); 0 wt% (exclusive) to 0.5 wt% (inclusive) chromium (Cr); 0 wt% (exclusive) to 0.1 wt% (inclusive) of titanium (Ti); 0 wt% (exclusive) to 0.02 wt% (inclusive) phosphorus (P); 0 wt% (exclusive) to 0.01 wt% (inclusive) of sulfur (S); from 0.001% by weight to 0.005% by weight of boron (B); the remainder being iron (Fe) and other unavoidable impurities, wherein the final microstructure of the steel sheet includes tempered martensite at a volume fraction of 90% or more; the average pitch between precipitates in the tempered martensite is 300 nm or more, the average size of the precipitates is 200 nm or less, and the number of precipitates having an average size of 40 nm or less is 25 or more based on the area of 20 [mu] m2 in the final microstructure.

The present invention relates to the technical field of automobile steel manufacturing, and in particular to a 780MPa grade ultra-high hole expansion performance cold-rolled complex phase steel plate for automobiles and a preparation method thereof. The steel plate is composed of the following chemical components in weight percentage: C: 0.08% to 0.13%; Si: 0.1% to 0.5%; Mn: 1.8% to 2.5%; Cr: 0.25% to 0.6%; Mo: 0.1% to 0.5%; Ti: 0.01% to 0.04%; Nb: 0.01% to 0.04%; B: 0 to 0.0004%; P≤0.02%; S≤0.01%, and the balance is Fe and unavoidable impurities. The final structure is a ferrite + bainite + martensite complex phase structure, and the microstructure is calculated by volume fraction as follows: critical zone ferrite 10% to 20%, oriented epitaxial ferrite ≤10%, bainite 25% to 35%, martensite 35% to 52%. The yield strength of the present invention is ≥600MPa, the tensile strength is ≥780MPa, the yield ratio is relatively high, and the hole expansion rate is ≥70%, which can meet the requirements of automobile manufacturers for high flanging performance.

The invention provides a preparation method of micro low-oxygen spherical TiAl alloy powder, and relates to the technical field of spherical titanium-based alloy powder. The preparation method comprises the steps of raw material selection and treatment of a wire material, preparation of a TiAl composite wire, preparation of a TiAl alloy wire, treatment of the TiAl alloy wire, establishment of a gas system, high-frequency induction preheating, radio frequency plasma smelting and atomization powder preparation which are sequentially carried out. According to the method, through multiple wire twisting, multiple continuous hot drawing, diffusion homogenization annealing, high-frequency induction preheating, radio frequency plasma smelting and atomization powder preparation, the TiAl alloy wire with the evenly-distributed components can be directly prepared at the low temperature, then the TiAl alloy fine powder with the low oxygen content and the evenly-distributed components is prepared, the TiAl alloy fine powder is suitable for additive manufacturing, and the method is suitable for being used for additive manufacturing. The method is high in flexibility, simple to operate, wide in application, low in cost and very suitable for large-scale industrial production.

The invention provides high-formability and high-strength aluminum alloy powder as well as a preparation method and application thereof. The aluminum alloy powder material comprises the following components in percentage by mass: 1.0-4.0 wt% of Cr; 1.0 to 4.0 wt% of Mg; mn: 0.5 to 2.5 wt%; 1.0 to 5.0 wt% of Zr; the balance is Al; wherein the ratio of Cr to Mg is 1: 1, and the ratio of Mn to Zr is 1: 2. Compared with a traditional aluminum alloy powder material, the aluminum alloy powder material can break through the solid solution limit of the material during material forming, additive manufacturing is achieved, non-uniform precipitation of a primary phase in the material can serve as a non-uniform nucleating agent of alpha-Al, heterogeneous nucleation of alpha-Al in the laser additive manufacturing process is promoted, and the laser additive manufacturing efficiency is improved. The stacking fault energy of the aluminum alloy is remarkably reduced by adding high Cr and Mg contents, twin crystals and 9R phases are introduced into the aluminum alloy, finally, the prepared material is uniform in structure, free of obvious segregation and isotropic in mechanical property, and the performance goals of high yield ratio, high formability and high strength are achieved.

The invention discloses a production method of zinc-plated low-alloy high-strength steel with the yield strength of 380MPa for an automobile structure. The production method comprises a smelting-continuous casting production process; the molten steel for a casting machine comprises the following components in percentage by mass: 0.05 to 0.08 percent of C, less than or equal to 0.06 percent of Si, 0.6 to 0.9 percent of Mn, less than or equal to 0.020 percent of P, less than or equal to 0.010 percent of S, 0.015 to 0.050 percent of Alt, 0.02 to 0.04 percent of Nb, 0.02 to 0.04 percent of Ti, 0.0008 to 0.0020 percent of Ca and less than or equal to 0.0070 percent of N; (2) a hot rolling production process; (3) pickling and cold rolling; and (4) carrying out continuous hot galvanizing and finishing processes. The mechanical properties of the galvanized low-alloy high-strength steel meet the requirements that the yield strength ReL is 380-480 MPa, the tensile strength Rm is 440-560 MPa, and the ductility A80 is larger than or equal to 19%.

The invention discloses a manufacturing method of thin-gauge low-yield-ratio Q500qE bridge steel, and belongs to the field of steel manufacturing. The method comprises the steps of component design, casting, heating, rolling, cooling and the like, and finally the required finished steel plate is obtained. The low-temperature impact resistance of the steel plate can be ensured while high strength and low yield ratio of the steel plate are effectively ensured under the condition of low alloy addition. Besides, controlled rolling, cooling and heat treatment processes are combined, the steel plate in the TMCP + T state is obtained, a microstructure with refined ferrite and bainite as main components is obtained in the whole plate thickness, the steel plate has the mechanical property characteristics of high strength, low yield ratio and high toughness, and the low-temperature impact toughness is that the fracture fiber section rate can reach 85% or above at the temperature of-40 DEG C. According to the steel plate, the target performance requirement can be met, the plate shape of the steel plate can be guaranteed, the steel plate has good comprehensive mechanical performance, in addition, the manufacturing cost is low, the carbon content is low, the weldability is greatly improved, and the steel plate has high manufacturability.

The invention provides a cold-rolled steel sheet. The cold-rolled steel sheet contains 0.23 wt% to 0.35 wt% of carbon (C), 0.05 wt% to 0.5 wt% of silicon (Si), 0.3 wt% to 2.3 wt% of manganese (Mn), greater than 0 wt% and less than or equal to 0.02 wt% of phosphorus (P), greater than 0 wt% and less than or equal to 0.005 wt% of sulfur (S), 0.01 wt% to 0.05 wt% of aluminum (Al), greater than 0 wt% and less than or equal to 0.8 wt% of chromium (Cr), and the balance of steel. The present invention relates to a cold-rolled steel sheet having a final microstructure containing cementite, transition carbides, and fine precipitates, the final microstructure being characterized in that: the final microstructure of the cold-rolled steel sheet contains, by weight, more than 0% and less than or equal to 0.4% of molybdenum (Mo), 0.01% to 0.1% of titanium (Ti), 0.001% to 0.005% of boron (B), and the remainder being iron (Fe) and unavoidable impurities; the transition carbide comprises epsilon-carbide in which the atomic ratio of a displacement element to carbon is 2.5: 1 or eta-carbide in which the atomic ratio of the displacement element to carbon is 2: 1, the displacement element is any one of Fe, Mn, Cr or Mo, the atomic ratio of the alloy element of the fine precipitate to carbon is 1: 1, and the alloy element is any one of Mo or Ti.

The present invention relates to an ultra high strength steel sheet having a high yield ratio, and a method for manufacturing same and, more specifically, to a steel sheet having ultra high strength, a high yield ratio and excellent bendability, and a method for manufacturing same.

This invention discloses a heat treatment method for improving the yield strength ratio of steel used in continuous extrusion dies. Specifically, the steel is subjected to the following sequential heat treatments: high-temperature normalizing, low-temperature normalizing, spheroidizing annealing, high-temperature quenching, high-temperature tempering, and low-temperature tempering. The high-temperature normalizing temperature is 1070℃~1100℃; the low-temperature normalizing temperature is 710℃~730℃; the spheroidizing annealing temperature is 840℃~870℃; the high-temperature quenching temperature is 1070℃~1100℃; the high-temperature tempering temperature is 620℃~640℃; and the low-temperature tempering temperature is 530℃~550℃. The yield strength ratio of the die steel after heat treatment using this method is ≥0.91, and the hardness is 48~52 HRC.

The invention provides seawater corrosion resistant H-shaped steel and a preparation method, and relates to the technical field of corrosion resistant low alloy steel. The seawater corrosion resistant H-shaped steel comprises the following chemical components in percentage by mass: 0.05%-0.1% of C, 0.50%-0.90% of Mn, 0.15%-0.35% of Si, 0.15%-0.25% of Ni, 0.6%-1.0% of Cr, 0.2%-0.3% of Cu, 1.0%-1.2% of Cu: Ni, 0.06%-0.15% of Mo, 0.04%-0.09% of Sb, less than 0.10% of Al, 0.41%-0.6% of Ni + Cu + Mo, 0.02%-0.06% of V + Nb + Ti, less than 0.04% of impurity elements P + S + O and the balance of Fe and inevitable elements. The preparation method is high in resource utilization rate, low in production cost, short in process, easy to operate, high in efficiency and beneficial to industrial large-scale production and popularization.

The invention relates to the technical field of ferrous metallurgy, in particular to high-toughness and low-yield-ratio weathering steel and a preparation method thereof. The weathering steel comprises the following chemical elements in percentage by weight: 0.05%-0.07% of C, 0.20%-0.40% of Si, 1.0%-1.20% of Mn, 0.013% < = P < = 0.018%, 0.003% < = S, 0.01%-0.03% of Al, 0.045% < = Nb, 0.025% < = Ti, 0.30%-0.45% of Cu, 0.70% < = Cr, 0.35% < = Ni and the balance of Fe and inevitable impurities. And the contents of the chemical elements simultaneously meet the following relations: the value range of a corrosion resistant factor xi is more than or equal to 6.5 and less than or equal to 9.0, and the value range of a through quenching factor phi is more than or equal to 0.17 and less than or equal to 0.2. The weathering resistant steel provided by the invention is good in microstructure uniformity, low in yield ratio and high in toughness.

The present application discloses a high magnetic induction non-oriented electrical steel sheet, which contains Fe and inevitable impurities, and further contains chemical elements with mass percentage as follows: C≤0.003%, Si: 1.2-3.0%, Mn: 0.1-0.6%, P: 0.01-0.15%, Al: 0.1-0.4%, Ni: 0.05-1.0%; and satisfies Si+Al: 1.3-3.2%; and does not contain Sn and Sb. In addition, the present application further discloses a manufacturing method of the above high magnetic induction non-oriented electrical steel sheet, which comprises the following steps: (1) smelting and casting; (2) heating, rough rolling, finish rolling and coiling: wherein the thickness of the intermediate blank after rough rolling is controlled to be 20-45 mm, and the thickness of the sheet after finish rolling is 1.2-2.0 mm; and after coiling, aging treatment is carried out in the range of 550-650 ℃ during temperature drop for 1-4 h, so that the proportion of equiaxed crystal with the ratio between long and short axes between 1.0-4.0 in the microstructure of the sheet is ≥75%; (3) pickling; (4) primary cold rolling; (5) continuous annealing; (6) insulation coating.

This invention discloses a method for preparing medium-strength rails with a high yield strength ratio, comprising the following steps: subjecting the slab obtained from continuous casting to segmented step heating, wherein the heating temperature of each segment gradually increases and the heating time of each segment is ≥30 minutes; rolling the slab heated by segmented step heating using a rolling mill to produce a rail with residual heat, wherein the final rolling temperature of the rail head and rail base is controlled at 900–950°C; spraying a cooling medium on the final rolled rail head to accelerate the cooling rate and cooling it to 500–550°C; reheating the final rolled rail base to reduce the cooling rate and cooling it to 650–700°C; subsequently, allowing the rail to cool naturally in air to room temperature; and straightening the rail cooled to room temperature. Using this method, the yield strength ratio and tensile strength of the rail can be effectively improved, significantly enhancing the rail's plastic stability limit.

The present invention provides a cold rolled steel material including, by weight, 0.04% to 0.07% of carbon (C), 0.1% to 0.3% of silicon (Si), 1.1% to 1.5% of manganese (Mn), 0.015% to 0.06% of aluminum (Al), more than 0% to 0.02% of phosphorus (P), more than 0% to 0.005% of sulfur (S), 0.02% to 0.04% of niobium (Nb), 0.17% to 0.23% of titanium (Ti), more than 0% to 0.1% of chromium (Cr), more than 0% to 0.005% of nitrogen (N), and a balance of iron (Fe) and other inevitable impurities, and having a yield strength (YS) of 600 MPa to 900 MPa, an elongation (EL) of 8% or more, and a yield ratio (YR) of 95% or more.

The invention relates to the technical field of metal material processing, in particular to high-yield-ratio ferrite bainite steel with high strength and plasticity and a preparation method thereof.The high-yield-ratio ferrite bainite steel is prepared from, by mass, 0.18%-0.22% of C, 1.2%-1.5% of Si, 2.4%-2.8% of Mn, 0.04%-0.07% of Nb, 0.3%-0.6% of Cr, 0.8%-1.2% of Alt, smaller than or equal to 0.005% of P, smaller than or equal to 0.003% of S, smaller than or equal to 0.0035% of N, smaller than or equal to 0.005% of O and the balance Fe and inevitable impurities. By regulating and controlling the chemical components and proportion of the steel, the yield ratio of the steel is increased, and the strength and plasticity matching is improved.

This invention discloses a cold-rolled hot-dip aluminized zinc-coated steel sheet with a yield strength of 350 MPa, mainly addressing the technical problems of large hole diameter variation rate, unstable yield strength, and low work hardening index in existing cold-rolled hot-dip aluminized zinc-coated steel sheets after processing. The technical solution is a cold-rolled hot-dip aluminized zinc-coated steel sheet with a yield strength of 350 MPa, the chemical composition of its substrate by weight percentage is: C: 0.15%–0.19%, Si: 0.05%–0.10%, Mn: 0.40%–0.60%, P≤0.015%, S≤0.015%, Nb: 0.025%–0.035%, Cr: 0.05%–0.15%, Al: 0.010%–0.030%, with the remainder being Fe and unavoidable inclusions. The yield strength ratio of the cold-rolled hot-dip aluminized zinc-coated steel sheet is 0.85–0.93, and the n value is 1.5–1.7; it is used for structural components in the home appliance and electrical cabinet industries.

This invention discloses a high-strength earthquake-resistant steel bar, relating to the field of building steel technology. It is composed of the following components by weight percentage: C: 0.16-0.19%, Si: 0.35-0.50%, Mn: 1.25-1.40%, V: 0.025-0.035%, N: 0.0060-0.0085%, Cu: 0.18-0.25%, Cr: 0.25-0.35%, Mo: 0.04-0.08%, composite rare earth: 0.010-0.018%, B: 0.0010-0.0020%, Ti: 0.008-0.015%, with the remainder being Fe. Impurity content is controlled as follows: P≤0.020%, S≤0.008%, O≤0.0020%. The sum of the weight percentages of all components is 100%. The steel bars prepared by this invention have good mechanical properties and corrosion resistance, and can meet the stringent seismic requirements of high-intensity earthquake zones.