61results about How to "Increased slab pass rate" patented technology

The invention discloses a method for manufacturing a bimetallic metallurgical composite wear-resisting tube blank, which comprises the following steps: firstly, spraying a water-based zircon powder coating onto a metal tube die after being baked to between 200 and 300 DEG C, wherein the spraying thickness is 1.0 to 3.0mm; secondly, centrifugally casting external liquid metal on the metal tube die after being baked to between 200 and 350 DEG C, cooling the metal tube die after casting, beginning to cast internal liquid metal into the metal tube die when an internal surface temperature of the outer layer is cooled to a temperature lower than a solidus temperature of the external metal; and finally, pouring the internal liquid metal into the metal tube die for centrifugal casting, cooling the metal tube die after casting, and stopping cooling when the outer layer and the inner layer are completely solidified, then the outer layer and the inner layer are metallurgically fused completely, wherein the outer layer is made of a plain carbon steel material or a low-alloy high-strength steel material and the inner layer is made of a high-chromium white cast iron material. The invention also discloses the bimetallic metallurgical composite wear-resisting tube blank manufactured by the method. The outer-layer metal and the inner-layer metal of the tube blank manufactured by the method can be metallurgically fused completely; the qualification rate is improved; and the use safety is high.

The invention discloses an economical duplex stainless steel sheet and a preparation method thereof. The stainless steel sheet comprises the following components in percentage by mass: 0.08 to 0.13 percent of C, 20 to 23 percent of Cr, 4 to 6 percent of Mn, 0.5 to 1.5 percent of Ni, 0.2 to 0.5 percent of Mo, 0.1 to 0.25 percent of N and the balance of iron and other inevitable impurities. The preparation method comprises the following steps: selecting and melting a raw material into molten steel according to the components; casting the molten steel into an ingot; performing hot rolling cogging and surface figuring on the ingot after a riser part is cut; performing hot rolling to obtain a hot-rolled plate with a thickness of 3 to 6mm; performing annealing, acid washing and cold rolling on the hot-rolled plate to obtain a sheet with a thickness of 1 to 1.5mm; performing solution annealing to obtain the economical duplex stainless steel sheet. According to the economical duplex stainless steel sheet and the preparation method thereof, by reasonable alloying design, the strength and the plasticity of the stainless steel sheet can be improved, hot rolling edge cracking can be eliminated, and the quality and the yield of the hot-rolled plate are greatly improved.

The invention provides a device for straightening curved continuous casting billets. The device comprises a frame and a continuous casting billet straightening structure arranged on the frame, wherein the continuous casting billet straightening structure comprises a supporting unit and a jack arranged on the supporting unit, and the supporting unit forms a first-row supporting unit and a second-row supporting unit; the first-row supporting unit and the second-row supporting unit are arranged on the frame side by side, and a space for containing the continuous casting billets is formed between the first-row supporting unit and the second-row supporting unit. By straightening the continuous casting billets being bent and deformed due to non-uniform cooling in the stacking process, the method can effectively make the original bent deformed continuous casting billets flat and straight, and the continuous casting billets enter the next procedure smoothly. Therefore, the percent of pass of casting billets is furthest increased, the rejection rate of casting billets is reduced, and the production cost is reduced. The device has the advantages of being simple in structure, low in manufacture cost and easy to operate and is suitable for popularization and application in the industry.

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 discloses a method for increasing the number of continuous drawing furnaces of sulfur-containing gear steel. The method comprises the working procedures of converter smelting, LF refining, RH refining and continuous casting. The method comprises the following steps of (1) at a converter smelting end point, C is not less than 0.06%, P is not more than 0.015%, and the tapping temperature is 1640 +/-10 degrees Celsius, during tapping, aluminum blocks and synthetic slag are added into molten steel, and the oxygen content in the steel is smaller than or equal to 50 ppm; (2) LF refining target slag comprises the following components of less than or equal to 0.6% of TFe, 54%-56% of CaO, 13%-15% of SiO2, 21%-23% of Al2O3 and 6%-8% of MgO, after slag is formed, white slag is kept by adopting a method of supplementing lime and silicon carbide, and adding a calcium line before outbound; (3) RH refining, after vacuum treatment is completed, adding a sulfur line, after soft argon blowing is carried out for more than or equal to 15 minutes, and discharging the molten steel; and (4) continuous casting, adopting a submersed nozzle. According to the method provided, the average continuous casting furnace number reaches 15, and the low-power grade of the produced gear steel reaches 2.0 grade.

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 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 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.