35results about How to "High impact energy at low temperature" patented technology

The invention provides high-performance ocean platform steel and its production method. When the thickness of a steel plate is 8-40mm, the steel plate is composed of the following chemical components, by weight, 0.11-0.13% of C, 0.20-0.50% of Si, 1.45-1.55% of Mn, 0.012% or less of P, 0.003% or less of S, 0.035-0.045% of V, 0.025-0.030% of Nb, 0.050% or less of Ti, 0.020-0.050% of Al, and the balance Fe and inevitable impurities; and when thickness of a steel plate is 40-100mm, the steel plate is composed of the following chemical components, by weight, 0.10-0.12% of C, 0.20-0.50% of Si, 1.50-1.60% of Mn, 0.012% or less of P, 0.003% or less of S, 0.070-0.075% of V, 0.030-0.040% of Nb, 0.050% or less of Ti, 0.020-0.050% of Al, and the balance Fe and inevitable impurities. The production method of the steel plate of the invention comprises the steps of electric furnace smelting, LF furnace refining, VD vacuum treatment, continuous casting (or die casting), heating, control rolling, cooling, stacking, and normalizing to prepare the steel plate. Through a reasonable component design and process optimization, the steel plate of the invention has excellent mechanical performances, welding performances and processing performances, and has strong market competitiveness.

A method for improving low-temperature impacting power of 17-4 PH maraging stainless steel forged piece based on organization control is characterized in that due to chemical component optimization, the total content of high-temperature ferrite generated in the steel material smelting process is reduced; then by controlling a reasonable forging and heating temperature, a deformation quantity and adeformation direction, the high-temperature ferrite in the smelting process is broken; long strip shape high-temperature ferrite can be forged in the direction perpendicular to the length direction of the ferrite, and is upset, and the directivity of the ferrite is effectively eliminated; finally, due to two times of solid solution and ageing heat treatment, the fine high-temperature ferrite is further eliminated in the recrystallizing process, and the low temperature impacting power is improved. According to the method, due to the fact that the long strip shape high-temperature ferrite is upset, the directivity of the ferrite is effectively eliminated, the area content of the long strip shape high-temperature ferrite is controlled at 0.6% or below, the low temperature impacting power isremarkably improved, KV2(-40 DEG C) is larger than or equal to 27 J, and the room temperature tensile strength is larger than or equal to 1000 MPa.

The invention belongs to the technical field of heat treatment processes, and discloses a heat treatment process for improving the low-temperature impact work of a 42CrMo bearing. The heat treatment process comprises the following quenching and tempering process parameters: the quenching heating temperature of quenching and tempering heat treatment is 840+/-10 DEG C; the quenching soaking time (h) of the quenching and tempering heat treatment is 3.5 hours; the tempering heating temperature of the quenching and tempering heat treatment is 580+/-10 DEG C; the tempering soaking time (h) of the quenching and tempering heat treatment is 8 hours; and a coolant adopted by the quenching and tempering heat treatment is F2000 with the concentration of 6 percent. The process solves the important technical problem that the low-temperature impact work cannot meet the requirement after a wind power bearing is treated by adopting a conventional heat treatment process; and the process greatly improves the low-temperature impact work of the wind power bearing, ensures that the wind power bearing has high reliability, and reduces hidden quality danger.

The invention discloses steel with high low temperature fracture toughness and used for ocean engineering and a manufacturing method thereof. The steel comprises the following components: 0.05%-0.10%of C, 0.2%-0.5% of Si, 1.0%-1.5% of Mn, 0.20%-0.50% of Cu, 1.00%-1.50% of Cr, 1.6%-1.8% of Ni, equal to or less than 0.01% of P, equal to or less than 0.01% of S, 0.01%-0.05% of Als, 0.02%-0.04% of Nb, 0.01%-0.02% of Ti, 0.05%-0.07% of V and the balance of Fe and unavoidable impurities. Rolling is controlled by adopting two phases, at the first phase, the rolling temperature is 950-1050 DEG C, andthe single-pass reduction rate is equal to or greater than 15%; at the second phase, the rolling temperature is 840-880 DEG C, and the single-pass reduction rate is greater than 10%; the average cooling rate is greater than 3 DEG C/s, and the self-tempering temperature is 500-600 DEG C; thermal treatment adopts twice quenching and tempering; the yield strength of a steel plate is equal to or greater than 620 MPa, the thickness of the steel plate is 60-100 mm, and the low temperature fracture toughness is high.

The invention provides an economical high-toughness X70 pipeline hot rolled steel plate coil and a preparation method thereof. The X70 pipeline hot rolled steel plate coil comprise the following chemical components by weight percentage (%) of: 0.060%<C<=0.075%, 0.15%<=Si<=0.30%, 1.20%<=Mn<=1.65%, 0.070<Nb<=0.080%, 0.010%<=Ti<=0.020%, and Cr<=0.25%. The preparation method includes steps of: a heating procedure, a rough rolling procedure, a finish rolling procedure, a cooling procedure and a coiling procedure, wherein in the finish rolling procedure, the rolling temperature of the first pass of finish rolling is not higher than 1050 DEG C, the deformation for the last pass of finish rolling is less than 8%, the accumulated deformation of the last two passes is less than 16%, and the finishing temperature of the finish rolling is 770-850 DEG C; in the cooling procedure: laminar cooling is conducted at a cooling rate of 18-26 DEG C/s after the finish rolling; and in the coiling procedure, coiling is conducted at 300-400 DEG C after the laminar cooling.

The invention provides a normalization heat treatment method of heavy-gauge low-alloy steel plates. The method concretely comprises the steps of heating, heat insulating and cooling. The steel plates prepared through the method of the invention comprise the following components: 0.18% or less of C, 0.50% or less of Si, 1.60% or less of Mn, 0.020% or less of P, 0.010% or less of S, 0.06% or less of Nb, 0.02-0.06% of Al, 0.03% or less of Ti, 0.08% or less of V, and the balance Fe and inevitable impurities. Different heat insulation time and cooling technologies are adopted according to different thicknesses of the steel plates, the heat insulation period is 1.8min/mm and a rolling transmission and collector spray water laminar flow mode is adopted to cool when the thicknesses of the steel plates are equal to or less than 100mm, and the heat insulation period is 2.0-2.2min/mm and a water tank cooling mode is adopted to cool when the thicknesses of the steel plates are greater than 100mm. The normalizing heat treatment technology of the invention allows the cooling intensity and the cooling speed of cores of the steel plates to be improved, the nucleation rate of the steel plates to be improved, tissues in the centers of the steel plates to be refined, the quality of the steel plates to be guaranteed and bad tissues and performances caused by uneven heavy-gauge steel plate cooling to be effectively solved, and is especially suitable for heat treatment technologies of thick steel plates.

The invention provides a high-pressure-resisting and low-carbon alloy steel material. According to the low-carbon alloy steel material, except Fe element, the other elements by weight percent are as follows: 0.15-0.2% of C, 0.15-0.35% of Si, 0.7-0.9% of Mn, 0.001-0.015% of S, 0.001-0.015% of P, 0.45-0.65% of Cr, 0.7-1.0% of Ni, 0.45-0.6% of Mo, 0.02-0.05% of Al, 0.003-0.008% of V and 0.02-0.05% of Nb. A smelting technology combining electric furnace treating and vacuum refining degassing with electroslag re-smelting is adopted. The content of C element is properly reduced in the material; the trace elements Nb, V and Al are increased; the effects of increasing the strength by 15% and refining grains for 2-3 levels by the material are achieved; the ductility and the toughness of the material are further increased; the dosage of rare elements, such as Cr, Ni and Mo, is reduced; and the material belongs to a resource-saving type material.

The invention relates to the technical field of metallurgical manufacturing, in particular to a preparing method for producing HRB400E fine-grain rebars. The method comprises steps of firstly, electric furnace smelting, wherein charging, slagging, deslagging, molten pool stirring and dephosphorization and desulfuration are carried out, and molten steel is obtained; secondly, external refining, wherein the obtained molten steel is subjected to refining; thirdly, vacuum degassing, wherein vacuum air exhaust is carried out, and casting is carried out to obtain a steel ingot; fourthly, forging, wherein program heating is carried out; and fifthly, heat treatment, wherein the forged forge piece is quenched and tempered in sequence, and before quenching, one-time annealing or normalization is carried out. The obtained product is high in yield strength and tensile strength, the mechanical property is good, the elongation is high, the anti-shock effect is better, and the preparing method is easily industrialized, low in cost and better in application prospect.

The invention discloses a submerged-arc welding wire for high-rise building structure refractory steel. The submerged-arc welding wire comprises the following chemical elements of, in percentage by weight, 0.03%-0.16% of C, 0.10%-0.20% of Si, 0.40%-1.00% of Mn, 0.20%-0.50% of Ni, 0.05%-0.20% of Mo, 0.01%-0.05% of Ti, 0.0005%-0.002% of B, 0.01%-0.04% of Nb, 0.01%-0.04% of Al, 0.01%-0.04% of V, 0.001%-0.004% of N, and the balance Fe and inevitable impurity elements. The submerged-arc welding wire is simple in composition, the deposited metal and welded joint formed by welding have excellent comprehensive mechanical properties, relatively high high-temperature tensile property and relatively high low-temperature impact power, the cost is low, and the application prospect is good.

The invention relates to a flame straightening method of a bogie frame of a high speed train. The method comprises the following steps: calibrating an infrared thermometer according to the applied range of flame heating temperature parameters; adjusting the emissivity of the infrared thermometer according to the calibration result; positioning the infrared thermometer above a weathering steel flame straightening area; heating the flame straightening area through neutral flame of oxy-acetylene flame and monitoring the temperature of a central region of a heating area in real time through the infrared thermometer at the same time until the temperature of reaches 730 to 750 DEG C; maintaining for 3 to 5 minutes; and cooling by air. According to the method, the high-weatherability steel is straightened; the hardness and the strength of a base material in the flame straightening area are closest to those of the base material; the low-temperature impact energy of the metal in the straightening area is more than that of the base material, and the impact energy AKV is up to 200J under the test temperature of -40 DEG C, and is 2.5 times that of a test specimen prepared from the same material under the maximum heating temperature controlled to be 600 to 650 DEG C in the straightening area.