74results about How to "Improve center quality" patented technology

The invention discloses a method for reducing segregation during a casting process of a continuous-casting square billet for a gear. The method comprises the following steps: before the end of LF refining, the temperature of molten steel is increased to the continuous-casting molten steel overheating degree of 20-30 DEG C; a relatively large amount of water is utilized for primary cooling and secondary cooling of the continuous-casting square billet of 150x150 mm; the proportion of the water volume of a foot roller section reaches 40%; the electromagnetic stirring function of a crystallizer isdisabled; the electromagnetic stirring at the tail end is performed at a relatively low electric current; and the casting is performed at a withdrawing speed of 2.00 m/min. According to the method, the electromagnetic stirring function of the crystallizer is disabled, and thus the circumstance that the molten steel purity is influenced when entrapped slag is generated due to excessive stirring inthe crystallizer during the molten steel casting process can be avoided; the cooling water volume can be increased, the cooling strength can be improved, the withdrawing speed can be reduced, and thecasting billet can be sufficiently cooled, the effects that the growth of columnar crystals is promoted and the central equiaxed crystal ratio is reduced can be achieved, the aggregation of solute elements towards the space among the crystals and the center can be avoided, and then the segregation of elements in the casting billet can be reduced; the carbon range from the surface to 3/8 of a diagonal of the continuous-casting square billet for the gear can be controlled to be within 0.015%; the central carbon segregation index can be within 1.05; and the steel performance stability can be improved.

The invention relates to the field of steel making and provides atmospheric corrosion-resistant molten structural steel. The molten structural steel is composed of 0.01%-0.09% by weight of C, 0.15%-0.35% by weight of Si, 0.30%-0.60% by weight of Mn, 0.30%-0.40% by weight of Cu, 0.20%-0.30% by weight of Ni, 3.5%-5.0% by weight of Cr, 0.06%-0.12% by weight of V, 0.01%-0.015% by weight of Nb, 0.005%-0.030% by weight of Ti, 0.004%-0.008% by weight of N, less than or equal to 0.030% by weight of P and less than or equal to 0.020% by weight of S. The invention provides atmospheric corrosion-resistant structural steel and a production method thereof. The molten steel continuous casting process improves the central quality of a casting blank, prevents central cracks and central shrinkage holes, improves the quality of the high strength and high atmospheric corrosion resistant structural steel blank and greatly improves a casting blank qualification rate. The atmospheric corrosion-resistant structural steel has good atmospheric corrosion resistance and high strength properties.

The invention relates to the steel making field, and particularly provides atmospheric-corrosion-resistant molten steel. Based on the total weight of the molten steel, the molten steel comprises 0.01-0.09% of C, 0.15-0.35% of Si, 0.30-0.60% of Mn, 0.30-0.40% of Cu, 0.20-0.30% of Ni, 2.0-3.5% of Cr, 0.13-0.15% of V, 0.005-0.030% of Ti, 0.004-0.008% of N, less than or equal to 0.030% of P and less than or equal to 0.020% of S. The invention also provides atmospheric-corrosion-resistant steel and a production method thereof. When the molten steel is adopted for continuous casting, the center quality of casting blanks can be improved, center cracks and center line shrinkage are prevented, accordingly, the quality of the high strength and high atmospheric corrosion resistance steel casting blanks can be improved, and the qualification rate of the casting blanks can be improved to a great extent; and the finally obtained atmospheric-corrosion-resistant steel has good atmospheric corrosion resistance and higher strength performance.

The invention relates to the field of steelmaking and particularly provides atmosphere corrosion resisting molten profile steel. Based on the total weight, the molten profile steel contains 0.01% to 0.09% of C, 0.15% to 0.35% of Si, 0.30% to 0.60% of Mn, 0.30% to 0.40% of Cu, 0.20% to 0.30% of Ni, 3.5% to 5% of Cr, 0.16% to 0.20% of V, 0.005% to 0.030% of Ti, 0.004% to 0.008% of N, not larger than 0.030% of P and not larger than 0.020% of S. The invention provides atmosphere corrosion resisting profile steel and a production method thereof. By adopting the molten profile steel provided by the invention for continuous casting, the center quality of an ingot can be improved, and generation of center cracks and center line shrinkage can be avoided, so the quality of high-strength high-atmosphere-corrosion-resistance type profile steel ingot can be improved, the percent of pass of the ingot can be greatly increased, and moreover the finally-obtained atmosphere corrosion resisting profile steel is good in atmosphere corrosion resistance and higher in strength property.

The invention relates to the field of steel making, and particularly provides atmosphere corrosion resisting structural steel liquid. Based on the total weight of the steel liquid, the steel liquid contains 0.01%-0.09% of C, 0.15%-0.35% of Si, 0.30%-0.60% of Mn, 0.30%-0.40% of Cu, 0.20%-0.30% of Ni, 2.0%-3.5% of Cr, 0.16%-0.20% of V, 0.004%-0.008% of N, 0.030% or less of P and 0.020% or less of S. The invention provides atmosphere corrosion resisting structural steel and a production method of the atmosphere corrosion resisting structural steel. The center quality of a casting blank can be improved by adopting the steel liquid for continuous casting, center burst and center line shrinkage are avoided, accordingly, the quality of the high-strength atmosphere corrosion resisting structural steel casting blank can be improved, and the qualification rate of the casting blank can be greatly improved; and meanwhile the finally-obtained atmosphere corrosion resisting structural steel is good in atmosphere corrosion resistance and has higher strength performance.

The invention relates to the field of steel making and provides atmospheric corrosion-resistant molten structural steel. The molten structural steel is composed of 0.01%-0.09% by weight of C, 0.15%-0.35% by weight of Si, 0.30%-0.60% by weight of Mn, 0.30%-0.40% by weight of Cu, 0.20%-0.30% by weight of Ni, 2.0%-3.5% by weight of Cr, 0.13%-0.15% by weight of V, 0.01%-0.015% by weight of Nb, 0.005%-0.030% by weight of Ti, 0.004%-0.008% by weight of N, less than or equal to 0.030% by weight of P and less than or equal to 0.020% by weight of S. The invention provides atmospheric corrosion-resistant structural steel and a production method thereof. The molten steel continuous casting process improves the central quality of a casting blank, prevents central cracks and central shrinkage holes, improves the quality of the high strength and high atmospheric corrosion resistant structural steel blank and greatly improves a casting blank qualification rate. The atmospheric corrosion-resistant molten structural steel has good atmospheric corrosion resistance and high strength properties.

The invention discloses an unmanned ship structure suitable for a severe sea condition environment. The unmanned ship structure comprises an unmanned ship body, a ship body, a balance wing, a hollow groove, a stable heavy hammer, an automatic adjusting stabilizer, a holder, a microcomputer controller, a first servo motor, a first gear, a connecting shaft, an outer ring angle sensor, an outer ring,a second servo motor, a second gear, an outer ring torquer, a third servo motor, a third gear, a middle ring, a middle ring torquer, an inner ring, an inner ring angle sensor, an inner ring torquer,a rotor, a shell, a tail balance wing and a propeller; the ship body is installed on the unmanned ship body, the hollow groove is formed in the balance wing, the stable heavy hammer is installed at the tail end of the balance wing, the automatic adjusting stabilizer is installed in the middle of the ship body, and the holder is installed on the automatic adjusting stabilizer. The unmanned ship structure has the advantages that the appearance is novel, the internal automatic adjusting stabilizer is small in size, light in weight, simple in structure and good in reliability, the running state ofan unmanned ship can be intelligently detected, automatic adjustment is achieved, and the stability of the unmanned ship in the course is kept.

The invention relates to the field of steel making and provides atmospheric corrosion-resistant molten structural steel. The molten structural steel is composed of 0.01%-0.09% by weight of C, 0.15%-0.35% by weight of Si, 0.30%-0.60% by weight of Mn, 0.30%-0.40% by weight of Cu, 0.20%-0.30% by weight of Ni, 3.5%-5.0% by weight of Cr, 0.16%-0.20% by weight of V, 0.01%-0.015% by weight of Nb, 0.021%-0.030% by weight of N, less than or equal to 0.030% by weight of P, less than or equal to 0.020% by weight of S and the balance of unavoidable impurities and Fe. The invention provides atmospheric corrosion-resistant structural steel and a production method thereof. The molten steel continuous casting process improves the central quality of a casting blank, prevents central cracks and central shrinkage holes, improves the quality of the high strength and high atmospheric corrosion resistant structural steel blank and greatly improves a casting blank qualification rate. The atmospheric corrosion-resistant structural steel has good atmospheric corrosion resistance and high strength properties.

The invention relates to the field of steel making and provides atmospheric corrosion-resistant molten structural steel. The molten structural steel is composed of 0.01%-0.09% by weight of C, 0.15%-0.35% by weight of Si, 0.30%-0.60% by weight of Mn, 0.30%-0.40% by weight of Cu, 0.20%-0.30% by weight of Ni, 3.5%-5.0% by weight of Cr, 0.16%-0.20% by weight of V, 0.01%-0.015% by weight of Nb, 0.005%-0.030% by weight of Ti, 0.004%-0.008% by weight of N, less than or equal to 0.030% by weight of P and less than or equal to 0.020% by weight of S. The invention provides atmospheric corrosion-resistant structural steel and a production method thereof. The molten steel continuous casting process improves the central quality of a casting blank, prevents central cracks and central shrinkage holes, improves the quality of the high strength and high atmospheric corrosion resistant structural steel blank and greatly improves a casting blank qualification rate. The atmospheric corrosion-resistant structural steel has good atmospheric corrosion resistance and high strength properties.

The invention relates to the field of steel making and provides atmospheric corrosion-resistant molten structural steel. The molten structural steel is composed of 0.01%-0.09% by weight of C, 0.15%-0.35% by weight of Si, 0.30%-0.60% by weight of Mn, 0.30%-0.40% by weight of Cu, 0.20%-0.30% by weight of Ni, 3.5%-5.0% by weight of Cr, 0.16%-0.20% by weight of V, 0.021%-0.030% by weight of N, less than or equal to 0.030% of P, less than or equal to 0.020% of S and the balance of inescapable impurities and Fe. The invention provides atmospheric corrosion-resistant structural steel and a productionmethod thereof. Through continuous casting of molten steel, the central quality of a casting blank is improved, central cracks and central shrinkage cavity are avoided, the quality of the high strength and high atmospheric corrosion resistant structural steel blank is improved, a casting blank qualification rate is greatly improved and good atmospheric corrosion resistance and high strength of the atmospheric corrosion-resistant structural steel are obtained.

The invention relates to the steel-making field, and specifically provides molten steel of atmospheric corrosion resistant steel. Based on total weight of the molten steel, the molten steel comprises the following components in percentage by weight: 0.01%-0.09% of C, 0.15%-0.35% of Si, 0.30%-0.60% of Mn, 0.30%-0.40% of Cu, 0.20%-0.30% of Ni, 3.5%-5.0% of Cr, 0.13%-0.15% of V, 0.005%-0.030% of Ti, 0.015%-0.020% of N, not greater than 0.030% of P and not greater than 0.020% of S. The invention provides atmospheric corrosion resistant steel and a production method thereof. The molten steel can be continuously cast to improve central quality of casting blank, and central cracks and central pore shrinkage are avoided, so that quality of high-strength atmospheric corrosion resistant steel casting blank can be improved, and the qualification rate of casting blank can be greatly increased; and moreover, the finally obtained atmospheric corrosion resistant steel is good in atmospheric corrosion resistance, and has higher strength performance.

The invention relates to the steel making field, and particularly provides atmospheric-corrosion-resistant molten steel. Based on the total weight of the molten steel, the molten steel comprises 0.01-0.09% of C, 0.15-0.35% of Si, 0.30-0.60% of Mn, 0.30-0.40% of Cu, 0.20-0.30% of Ni, 3.5-5.0% of Cr, 0.16-0.20% of V, 0.005-0.030% of Ti, 0.021-0.030% of N, less than or equal to 0.030% of P and less than or equal to 0.020% of S. The invention also provides atmospheric-corrosion-resistant steel and a production method thereof. When the molten steel is adopted for continuous casting, the center quality of casting blanks can be improved, center cracks and center line shrinkage are prevented, accordingly, the quality of the high strength and high atmospheric corrosion resistance steel casting blanks can be improved, and the qualification rate of the casting blanks can be improved to a great extent; and the finally obtained atmospheric-corrosion-resistant steel has good atmospheric corrosion resistance and higher strength performance.