86results about How to "Reduced impact toughness" patented technology

The invention belongs to the field of a heat treatment process for reciprocating-compressor 2Cr13 piston-rods, and is applicable to all reciprocating compressors adopting a 2Cr13 piston-rod heat treatment process and mechanical equipment which requires high toughness and needs post-order surface heat treatment. The process can solve the problem that the prior heat treatment adopted for 2Cr13 piston rods is low in impact toughness, large in high-frequency quenching deformation of long-axis parts, large in hardening cracks and workpiece residual stress, and the like. The process comprises the forging molding of 2Cr13 piston rods, annealing, quenching-tempering, stabilizing, medium-frequency or high-frequency quenching and low-temperature tempering. The 2Cr13 heat treatment process can completely overcome the disadvantages of the prior heat treatment process such as incapability of eliminating residual stress and serious high-frequency quenching workpiece distortion, and is an ideal heat treatment process for long-axis workpieces.

The invention provides a high-strength high-toughness gas shield flux-cored wire for high-strength steel and belongs to the technical field of welding materials. The flux-cored wire comprises an outer skin and a flux core. The flux core accounts for 12%-25% of the total weight of flux-cored wire, and the outer skin is made of an industrial pure iron strip. The flux core contains, by weight, graphite powder 0%-10%, TiO2 5%-20%, Mn-Fe alloy 10%-40%, Si-Fe alloy 0.5%-2%, Al-Mg alloy 0.5%-4%, Ni 2%-15%, Cr-Fe alloy 1%-30%, Mo-Fe alloy 1%-30%, Ti-Nb-V-Fe alloy 1%-20%, fluoride 0.5%-3%, trace rare-earth yttrium element oxide Y2O3 smaller than or equal to 1% and the balance iron powder. The high-strength high-toughness gas shield flux-cored wire has the advantages that the flux-cored wire prepared according to the composition proportion is high in strength, high in toughness and moderate in hardness and does not easily carry residues, and a welded joint can be matched with a 1000 MPa high-strength steel plate in an equal strength mode.

The invention relates to an environment friendly AC (alternating current)-DC (direct current) alkaline low-hydrogen welding rod. The welding rod can reduce welding dust, and has a good AC-DC welding technology performance, higher welding rod deposition efficiency and corresponding chemical components and good mechanical properties. So, the invention is conductive to saving energy, reducing emission and reducing environment pollution and is beneficial to the people's livelihood. The welding rod comprises a coating and a welding core, wherein the coating comprises 24-34 parts by weight of marble, 21-32 parts by weight of fluorite, 4-16 parts by weight of iron powder, 3-10 parts by weight of barium carbonate, 2-7 parts by weight of synthetic rutile, 1-4 parts by weight of feldspar, 5-9 parts by weight of medium carbon ferromanganese, 5-12 parts by weight of ferrotitanium, 4-7 parts by weight of No.45 atomized ferrosilicon, 1-2 parts by weight of synthetic mica, 1-3 parts by weight of titanium white and 0.5-1.5 parts by weight of sodium carbonate, and the welding core adopts H08A. The invention is used as a welding rod.

The invention relates to a wide-gap square butt joint welding technology and welding structure. A copper liner is adopted to replace a ceramic liner, and the problem that ceramic is molten and stirred to generate slag inclusion is avoided. In the backing weld process, the copper liner is cooled, a weld joint is fast cooled and formed, meanwhile, a weld connector is prevented from generating an overheated structure, the segregation degree is effectively reduced, and the mechanical performance of the weld connector is improved. A solid welding wire is used for backing weld, and weld cracks are not prone to being generated. A contrast test shows that when a gap is 12 mm, the ceramic liner is adopted for single-face CO2 welding, the formed surface of the weld joint on the back face is wide, backing thickness is increased, the weld joint is overheated, reinforcement height is large, forming deteriorates, the liner is prone to falling off, and impact toughness is reduced severely; through the wide-gap square butt joint welding technology, the weld joint is formed attractively and is golden, a backing weld channel on a macro-test sample is small and even in grain, and a welding technology test displays that all indexes of the mechanical performance of the whole weld connector meet the requirement of EH36 steel plates.

The invention discloses a normalized steel plate for wind power, and a production method thereof. The yield strength, the tensile strength, the elongation percentage A, the -40DEG C impact energy and the -60DEG C impact energy of the normalized steel plate for wind power are not lower than 370MPa, 500-650MPa, not lower than 30%, not lower than 250J and not lower than 200J respectively. The steel plate comprises, by mass, 0.12-0.18% of C, 0.21-0.32% of Si, 1.10-1.65% of Mn, 0.015% or less of P, 0.008% or less of S, 0.015-0.040% of Nb, 0.015-0.03% of Ti, 0.025-0.06% of Als, 0.004-0.010% of N, and the balance of Fe and inevitable impurities; and 203*C<1 / 2>-44.7*Si is not lower than 61 and not greater than 72, and Ti / (C / 100+N) is in a range of 2.47-2.69 or 2.88-2.90. Nb and Ti alloy is used in the steel plate, so alloy cost of the steel plate is reduced, the low temperature performances of the steel plate are enhanced, the yield strength is high, and the technical problems of high alloy cost, poor low temperature performances and small normalized yield strength of steel plates for wind power in the prior art are solved.

The invention discloses a high-strength titanium alloy steam turbine blade. The surface of the steam turbine blade is further provided with a protection layer, and the protection layer is prepared from, by mass, 10-15 parts of modified ethylene-propylene-diene monomer rubber, 15-20 parts of methyl phenyl silicone resin, 8-11 parts of organosilicon-modified epoxy resin, 5-7 parts of nanometer SiC powder, 13-15 parts of filler and pigment, 3-5 parts of dispersing agent, 10-15 parts of coupling agent, 13-15 parts of curing agent, 7-9 parts of defoaming agent and 1-3 parts of anti-mildew bactericide. The high-strength titanium alloy steam turbine blade has good strength, and is good in corrosion resistance, simple in preparation process, low in cost and long in service life.

The invention provides an X80 steel grade anti-corrosion low-temperature seamless line pipe which comprises the following components in percentage by weight: 0.08 to 0.14 percent of C, 0.20 to 0.35 percent of Si, 1.10 to 1.40 percent of Mn, less than or equal to 0.015 percent of P, less than or equal to 0.005 percent of S, 0.10 to 0.20 percent of Mo, 0.020 to 0.060 percent of Al, 0.02 to 0.05 percent of Nb, 0.05 to 0.10 percent of V, 0.10 to 0.20 percent of Cu, 0.10 to 0.20 percent of Ni, less than or equal to 0.015 percent of Ti, less than or equal to 0.15 percent of Cr, 0.0015 to 0.0060 percent of Ca, less than or equal to 0.0005 percent of B, less than or equal to 0.012 percent of N, less than or equal to 0.43 percent of CEV, less than or equal to 0.23 percent of Pcm and trace amount of ferrum and impurity elements. The line pipe has the rigidity of less than or equal to 250 HV10 and grain size of more than or equal to 8 levels, and passes tests of hydrogen induced cracking (HIC) and sulfide stress corrosion (SSC) corrosion tests at the ductile-brittle transition temperature of below -60 DEG C. The line pipe has the advantages that the integral tissue of a pipe body is uniform,the equivalent carbon content is less than the that of the requirement of the American petroleum institute (API) 5L standard, the welding performance is high, the low-temperature toughness and anti-corrosion performance are excellent, the cost is low, and the requirement of users on the X80 steel grade seamless line pipe can be met completely.

The invention discloses a long-life steam turbine blade. The long-life steam turbine blade consists of the following chemical components in percentage by weight: 0.29-0.31% of C, 0.16-0.19% of Si, 0.75-0.77% of Mn, 0.73-0.85% of Ni, 9.5-10.1% of Cr, 0.55-0.64% of Mo, 0.15-0.17% of Sn, 0.11-0.15% of V, 0.82-0.84% of Sr, 0.15-0.17% of Nb, 0.02%-0.03% of Cu, 0.13%-0.15% of T, 0.06-0.08% of B, not greater than 0.01% of Ca, not greater than 0.03% of S, not greater than 0.03% of P, 0.16%-0.18% of rear-earth metal, and the balance of Fe. The production process disclosed by the invention is carried out by hot-forging, annealing, blade mechanical machining, distressing thermal treatment, tempering thermal treatment, cooling, surface-enhanced thermal treatment, physical and chemical inspecting, ultrasonic-wave flaw detecting, and cleaning-packaging. The production process disclosed by the invention can greatly improve impact toughness of the blade, can improve water erosion resistance and corrosion resistance of the blade, and can prolong the service life of the blade.