69results about How to "Avoid center crack" patented technology

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, 0.16-0.20% 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 belongs to the technical field of round steel production, and relates to a method for producing low-cost 20CrMoA round steel by omitting a VD process in combination with component optimization. The steel comprises 0.19-0.20% of C, 0.60-0.63% of Mn, 0.23-0.25% of Si, 0.16-0.18% of Mo, 0.92-1.00% of Cr, less than or equal to 0.30% of Ni, less than or equal to 0.020% of P, less than or equal to 0.020% of S, less than or equal to 0.20% of Cu, 0.16-0.18% of Alt, and the balance Fe and inevitable impurities. The method comprises the steps of converter smelting, LF refining, continuous casting, stack cooling, heating, high-temperature shearing, and hot steel collection. By optimizing the components and the process, the cost per ton of steel is reduced while the performance of the steel is ensured; and the problems that center segregation exists in a continuous casting billet and center cracks are generated at the end of steel due to an improper cooling process during rolling are effectively solved, and the application prospect is wide.

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, 0.16%-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, 2.0%-3.5% by weight of Cr, 0.16%-0.20% by weight of V, 0.01%-0.015% by weight of Nb, 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 steel and a production methodthereof. 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 casting blank and greatly improves a casting blank qualification rate. The atmospheric corrosion-resistant structural steel has good atmosphericcorrosion 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, 0.13%-0.15% by weight of V, 0.01%-0.015% by weight of Nb, 0.015%-0.020% 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 steel-making field, and concretely provides an atmospheric corrosion resistant structural steel liquid, which contains the following components by adopting the total weight of the steel liquid as the baseline: 0.01 percent to 0.09 percent of C, 0.15 percent to 0.35 percent of Si, 0.30 percent to 0.60 percent of Mn, 0.30 percent to 0.40 percent of Cu, 0.20 percent to 0.30 percent of Ni, 2.0 percent to 3.5 percent of Cr, 0.06 percent to 0.12 percent of V, 0.005 percent to 0.030 percent of Ti, 0.008 percent to 0.014 percent of M, less than or equal to 0.030 percent of P, and less than or equal to 0.020 percent of S. The invention provides atmospheric corrosion resistant structural steel, and a production method thereof. By adopting the steel liquid provided by the invention for continuous casting, the central quality of a casting blank can be improved, and the occurrence of center burst and center line shrinkage is avoided, so that the quality of a high atmospheric corrosion resistant structural steel casting blank with high strength can be improved, and the yield of the casting blank can be greatly improved; and in addition, the finally obtained atmospheric corrosion resistant structural steel has good atmospheric corrosion resistance and a higher strength performance.

The invention relates to the field of steelmaking and particularly provides molten steel of an atmosphere-corrosion-resistant structural steel. The total weight of the molten steel serves as the datum, and 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, 0.01%-0.015% of Nb, 0.015%-0.020% of N, not greater than 0.030% of P and not greater than 0.020% of S. The invention provides the atmosphere-corrosion-resistant structural steel and a production method thereof. By means of continuous casting of the molten steel, center quality of a casting blank can be improved, center cracks and center shrinkage cavities are avoided, therefore quality of the casting blank of the structural steel high in strength and atmosphere-corrosion resistance can be improved, and the qualification rate of the casting blank can be remarkably increased; and in addition, the atmosphere-corrosion-resistant structural steel which is finally obtained is good in atmosphere-corrosion resistance and higher in strength performance.

The invention relates to the field of steelmaking, and particularly provides atmosphere corrosion resistant section steel molten steel. Taking the total weight of the molten steel as a standard, 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, 0.06%-0.12% of V, 0.004%-0.008% of N, not larger than 0.030% of P and not larger than 0.020% of S. The invention provides atmosphere corrosion resistant section steel and a production method of the atmosphere corrosion resistant section steel. Through continuous casting of the molten steel in the invention, the center quality of a casting blank can be improved, center cracks and center line shrinkage can be avoided, and therefore the quality of the high-intensity high-atmosphere-corrosion-resistant section steel casting blank can be improved, and the yield of the casting blank can be greatly improved; and in addition, the finally-obtained atmosphere corrosion resistant section steel is good atmosphere corrosion resistance and has the high intensity performance.

The invention relates to the field of steelmaking and particularly provides atmosphere corrosion resisting profile steel liquid. On the criterion of the total weight of the steel liquid, the steel liquid 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, 0.16-0.20% of V, 0.005-0.030% of Ti, 0.01-0.015% of Nb, 0.021-0.030% of N, no more than 0.030% of P and no more than 0.020% of S. The invention provides atmosphere corrosion resisting profile steel and a production method thereof. When the steel liquid is adopted for continuous casting, the center quality of cast blanks can be improved, center cracking and center line shrinkage are avoided, and thus the quality of profile steel cast blanks with high strength and high atmosphere corrosion resistance can be improved, and the qualification rate of cast blanks can be greatly increased. In addition, the finally obtained atmosphere corrosion resisting profile steel has good atmosphere corrosion resistance and higher strength.

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, 2.0%-3.5% of Cr, 0.16%-0.20% of V, 0.005%-0.030% of Ti, 0.021%-0.030% 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 hole shrinkage are avoided, so that quality of high-strength steel casting blank with high atmospheric corrosion resistance can be improved, and the qualification rate of the 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 field of steel making, 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, 0.004%-0.008% 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 field of steel making, 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, 0.004%-0.008% 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 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, 0.008%-0.014% 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, 0.13%-0.15% by weight of V, 0.01%-0.015% by weight of Nb, 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 highstrength 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 steelmaking, and particularly provides atmosphere corrosion resistant section steel molten steel. Taking the total weight of the molten steel as a standard, 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, 0.004%-0.008% of N, not larger than 0.030% of P and not larger than 0.020% of S. The invention provides atmosphere corrosion resistant section steel and a production method of the atmosphere corrosion resistant section steel. Through continuous casting of the molten steel in the invention, the center quality of a casting blank can be improved, center cracks and center line shrinkage can be avoided, and therefore the quality of the high-intensity high-atmosphere-corrosion-resistant section steel casting blank can be improved, and the yield of the casting blank can be greatly improved; and in addition, the finally-obtained atmosphere corrosion resistant section steel is good atmosphere corrosion resistance and has the high intensity 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, 0.16%-0.20% by weight of V, 0.01%-0.015% by weight of Nb, 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 steel and a production methodthereof. 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 casting blank and greatly improves a casting blank qualification rate. The atmospheric corrosion-resistant structural steel has good atmosphericcorrosion resistance and high strength properties.

Relating to the steelmaking field, the invention especially provides an atmospheric corrosion resistant molten steel. Based on a total weight, the molten steel 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, 0.06%-0.12% of V, 0.01%-0.015% of Nb, 0.004%-0.008% of N, and not more than 0.030% of P and not more than 0.020% of S.The invention provides an atmospheric corrosion resistant steel and a production method thereof. Continuous casting of the molten steel provided by the invention can improve the central quality of a casting blank, avoids central crack and central shrinkage cavity, thereby improving the quality of the high strength and high atmospheric corrosion resistant steel casting blank and greatly enhancing the casting blank qualification rate. Also, the finally obtained atmospheric corrosion resistant steel has good atmospheric corrosion resistant ability and higher strength performance.