7 results about "Maraging steel" patented technology

This invention relates to the field of steel materials technology, and discloses a high-strength and high-toughness synergistically optimized martensitic aging steel and its preparation method. The martensitic aging steel comprises, by mass percentage: Co: 15.5~17.0%, Ni: 17.0~19.0%, Mo: 6.0~8.0%, Ti: 1.0~2.0%, Al: 0.5~1.0%, Mn: 0.1~0.5%, Zr: 0.01~0.05%, with the balance being Fe and unavoidable impurities. This invention can synergistically improve the strength and toughness of martensitic aging steel while reducing the difficulty of its preparation.

The application discloses a functional gradient material and a preparation method and application thereof. The functional gradient material comprises, in sequence, a martensitic stainless steel base material layer, a transition layer, a nickel-based alloy layer, a composite gradient layer and a maraging steel layer. The transition layer is made of nickel-based alloy and austenitic stainless steel; the composite gradient layer is made of nickel-based alloy and maraging steel; and the microhardness of the martensitic stainless steel base material layer, the transition layer and the nickel-based alloy layer satisfies the following relationship: martensitic stainless steel base material layer < transition layer < nickel-based alloy layer; in the composite gradient layer, at least two sublayers with different compositions are included; and from the nickel-based alloy layer to the maraging steel layer, the mass percentage of nickel-based alloy in each layer decreases by 20-40 wt% in turn. The functional gradient material effectively solves the problem of interface hardness mutation during deposition of the maraging steel, and makes the material have excellent yield strength, elongation and wear resistance.

The present application relates to the field of aviation equipment maintenance, and particularly relates to an aircraft refueling control valve nut inner thread repairing device and a manufacturing method thereof, which comprises a base plate, further comprises a positioning gyroscope connected with a piston and a screw tap tenon, a cylindrical gyroscope handle with the same shape as the through hole of the piston is arranged on the positioning gyroscope, and a gyroscope disc with the same shape as the groove of the piston is arranged on the positioning gyroscope, the shape of the positioning gyroscope is gyroscope, and the specific steps are as follows: S1, size design; S2, positioning gyroscope model creation; S3, model data processing; S4, 18Ni300 die steel powder preparation; S5, positioning gyroscope rapid preparation; S6, aircraft refueling control valve nut inner thread repairing device assembly; the positioning gyroscope with the size of the piston accessory and the screw tap accessory is designed to be gap fit with both, 18Ni300 maraging steel material is selected, laser selection melting forming technology is adopted for rapid manufacturing, and finally the aircraft refueling control valve nut inner thread repairing device with variable range of clamping angle is obtained.

This invention relates to the field of martensitic aging steel production technology, specifically disclosing a martensitic aging steel wire with a pressure of 2.3 GPa or higher and its preparation method. The preparation method includes: forming a steel ingot into a coil with a diameter of 8-10 mm; subjecting the coil to solution treatment, cooling it to room temperature, and then performing surface processing to obtain a first intermediate wire; subjecting the first intermediate wire to multiple drawing cycles to obtain a wire with a diameter of 1-2 mm; wherein the drawing cycle treatment includes: cold drawing followed by online solution heat treatment. This invention produces martensitic aging steel wire products with a diameter of Φ1.0~2.0mm and a Pa value of 2.3GPa or higher by gradient adjustment of the drawing diameter reduction of wire rod and wire and intermediate solution annealing treatment, thereby controlling the grain size of the wire to 3~6µm. The yield strength Rp0.2>2.3GPa, tensile strength Rm>2.4GPa, and elongation A≥5% of the wire after aging treatment are achieved. Furthermore, the preparation method is designed based on the equipment conditions of metal wire manufacturing manufacturers, making it easy to operate, highly efficient, and with high product quality stability.

The application relates to a martensite aging steel and a preparation method thereof, relates to the technical field of material preparation, and mainly aims to solve the technical problem of insufficient strength and toughness of the existing large-size martensite aging steel. The main technical scheme is that the microstructure of the martensite aging steel has a super-fine crystal complex phase structure; the super-fine crystal complex phase structure comprises a super-fine crystal martensite phase and a super-fine crystal austenite phase; in the super-fine crystal complex phase structure, the super-fine crystal martensite phase and the super-fine crystal austenite phase are interwovenly distributed; the average grain size of the super-fine crystal austenite phase is 0.3-1.0 mu m; and the effective grain size of the super-fine crystal martensite phase is 0.4-1.2 mu m. The application mainly aims to improve the strength and toughness of the large-size martensite aging steel.

The application relates to the field of powder metallurgy and new material technology, in particular to an injection-molded maraging steel and a preparation method and application thereof, and the preparation method comprises the following steps: preparing metal powder raw materials through feeding, injection molding, degreasing, sintering, solid solution treatment and aging treatment to obtain the maraging steel, wherein the solid solution treatment adopts secondary solid solution treatment, the first solid solution treatment adopts 1000-1100 DEG C heat preservation for 1-3 hours, and the second solid solution treatment adopts 800-900 DEG C heat preservation for 1-3 hours. The preparation method provided by the application can simultaneously meet the high-strength high-plasticity standard of not less than 2100 MPa of yield strength and not less than 5% of elongation after fracture by first carrying out the first solid solution treatment at high temperature and then carrying out the second solid solution treatment at low temperature.

The application belongs to the field of metallurgy and pressure processing, and discloses a 18Ni maraging steel round disc and a preparation method thereof. The preparation method comprises the following steps: carrying out primary smelting on a Ni plate, metal cobalt, a molybdenum strip, sponge Ti and industrial pure iron in a vacuum induction furnace to obtain a molten steel; pouring the molten steel into a consumable electrode, and carrying out secondary remelting on the consumable electrode in a vacuum consumable furnace to obtain a steel ingot; carrying out blooming on the steel ingot to obtain a billet; rolling the billet into a bar; and carrying out heat treatment and discing on the bar to obtain the 18Ni maraging steel round disc. The length of the 18Ni maraging steel bar is increased from 2-12 meters to more than 2000 meters through the rolling method, and the problem of large end material waste caused by the short length and large number of 18Ni maraging steel bars is solved.