5results about How to "Uniform grain refinement" patented technology

The present application relates to a kind of ultra-high purity copper smelting casting method, the smelting casting method includes: the copper material is carried out vacuum smelting, when the vacuum degree becomes 280-310 times of the vacuum degree when vacuum smelting starts in process, vacuumizing is carried out, then in turn, heat preservation and casting are carried out;The casting speed is gradient change in the casting.This smelting casting method provided by the present application realizes the preparation of ultra-high purity copper ingot by the design of vacuum degree in vacuum smelting and the combination of specific casting process, the purity of the obtained ultra-high purity copper is ≥99.9999%, and there is no inclusion and no casting defects such as internal or surface hole.

The application provides a method for preparing high-strength and high-toughness 316L stainless steel through DS warm rolling, and comprises the following steps: step a, hot forging is performed on a 316L steel ingot to obtain a forged 316L steel plate; step b, heating treatment is performed on the forged 316L steel plate; step c, DS rolling is performed on the heated 316L steel plate; step d, steps b and c are repeated for ten to twenty times; and step e, flattening treatment is performed on the 316L steel plate to obtain a high-strength and high-toughness 316L austenitic stainless steel plate. The application adopts the DS warm rolling process for rolling, compared with the synchronous warm rolling process, the mechanical properties of the 316L austenitic stainless steel are obviously improved, the yield strength of the 316L austenitic stainless steel at room temperature can reach 845 MPa, and the elongation can reach 22%; the yield strength at the liquid nitrogen temperature of -196 DEG C can reach 1130 MPa, the maximum tensile strength can reach 1712 MPa, and the elongation can reach more than 58%, the mechanical properties are obviously improved, the technical difficulty is low, and the method can be widely used in the fields of low-temperature containers, ships, ocean chemical industry and nuclear industry.

The utility model discloses fastener wire rod spheroidizing annealing mechanism, including annealing furnace and wire rod roll, and the wire rod roll is formed by the wire rod of multiple disc stacking together, still include, rotation axis, rotation axis can drive wire rod roll to spread, increase the contact area with annealing furnace space, transmission assembly can drive multiple rotation axis rotation. The utility model has the beneficial effects that, through rotation axis rotation can drive wire rod roll to spread, increase the contact area with annealing furnace space, avoid the material to produce greater temperature difference, improve annealing efficiency's simultaneously, make the grain refinement of material more stable, uniform.

The application discloses a heat treatment process of low-alloy steel castings, and the heat treatment process of the low-alloy steel castings controls the chemical element content of the low-alloy steel castings reasonably, so that the strength of the steel castings is higher; the heating temperature in the heat treatment process is appropriately increased, and the holding time is prolonged, so that the structure transformation of the steel is sufficient, and the mechanical performance and the impact toughness are effectively improved. The heat treatment process adopts a process flow of preheating + normalizing + tempering + quenching + annealing, and compared with a traditional heat treatment process, the heat treatment process has the advantages that the grains are further refined and uniform, the grain size is maximally increased, and good structure conditions are prepared for subsequent heat treatment.

The application discloses a manganese-zinc ferrite and a preparation method thereof, and the method comprises the following steps: mixing manganese-zinc ferrite powder and a polyvinyl alcohol solution to obtain a mixture, and grinding the mixture; performing a compression molding treatment on the ground mixture to obtain a compression molding product; and performing a sintering treatment on the compression molding product to obtain the manganese-zinc ferrite; wherein the sintering treatment comprises a temperature rising treatment stage, and the temperature rising treatment stage comprises a plurality of temperature rising stages, at least two of which have different temperature rising rates. The manganese-zinc ferrite prepared by the application can have a high saturation magnetic flux density and a low residual magnetism while keeping a low loss at a high frequency, that is, the manganese-zinc ferrite with a large magnetic induction intensity change amount is prepared.