37results about How to "High alloy content" patented technology

The invention relates to a super double-phase stainless steel composite steel plate and manufacturing method thereof. The super double-phase stainless steel composite steel plate has a four-layer structure, wherein, the middle two layers are double-phase stainless steel, and the upper and lower layers are carbon steel; the double-phase stainless steel comprise the following components by weight percentage: less than or equal to 0.03% of C, less than or equal to 1.20% of Mn, less than or equal to 0.80% of Si, 24.0-26.0% of Cr, 6.0-8.0% of Ni, 3.0-5.0% of Mo, 0.24-0.32% of N, and the balance ofFe and inevitable impurities; the carbon steel comprises the following components by weight percentage: 0.03 to 0.12% of C, 0.10 to 0.45% of Si, 0.70 to 1.60% of Mn, less than 0.020% of P, less than 0.025% of S, 0-0.35% of Cu, 0-0.40% of Cr, 0-0.40% of Ni, 0-0.05% of Nb, 0-0.40% of Mo, 0-0.018% of Ti, 0.015-0.045% of Al, and balance of Fe and unavoidable impurities. The composite steel plate of the invention can obtain good structural strength and corrosion resistance. The composite steel plate is the rolled composite plate, which can realize metallurgical bonding of a coating layer and a basematerial, so that the good bonding force can be obtained.

The invention relates to a manufacturing method of a low-coercive force electromagnetic pure ion cold-rolled sheet. The manufacturing method comprises the following steps in sequence: I. manufacturing of a sheet billet with optimal components, to be specific, a. during smelting, controlling C, N, O and S elements and impurity contents thereof, increasing the Al alloy content in steel, and reducing the S content in steel, and b. continuous casting of the sheet billet; II. hot rolling of steel coils, to be specific, a. the heating temperature of the sheet billet is 1160-1200 DEG C; b. hot rolling and finishing rolling at a high temperature, rolling the sheet billet into a hot-rolled steel sheet with the thickness of 1.5mm-7.0mm at 860-1000 DEG C, c. curling at a high temperature, wherein the curing temperature of the hot-rolled steel sheet is 700 DEG C to 800 DEG C; III. cold rolling and molding, wherein the total amount of deformation during cold rolling is 30%-40%; IV. annealing a single sheet by adopting a nitrogen protective cover type furnace, and carrying out heat preservation for 6-8 hours at 540-560 DEG C; and V. magnetism heat treatment, to be specific, carrying out magnetic heat treatment on a test sample for magnetism detection by adopting a vacuum or atmosphere protective anti-oxidation heat treatment furnace at 1000-1100 DEG C for no less than 2 hours of heat preservation. The low-coercive force of the low-coercive force electromagnetic pure ion cold-rolled sheet manufactured by the method is 11-20A / m.

The invention provides a P91 seamless steel pipe and a method for manufacturing the P91 seamless steel pipe. The method comprises the following steps: smelting a blank: performing smelting, refining, vacuum degassing and round-blank continuous casting on raw materials to obtain the blank; annealing: performing high-temperature diffusion annealing and low-temperature isothermal annealing on the blank; rolling the blank periodically: heating the annealed blank uniformly, hot rolling, perforating, sizing and cooling; and carrying out thermal treatment: heating the blank rolled periodically to 1,040-1,080 DEG C, normalizing, preserving heat, cooling, heating to 750-800 DEG C, performing tempering, preserving heat and cooling to obtain the P91 seamless steel pipe. The content of P in the raw materials is less than or equal to 0.015%, and the content of S content is less than 0.007%. and the diameter phi of the seamless steel pipe is 325-720mm. The P91 seamless steel pipe manufactured by adopting the method is compact in internal structure and excellent in performance. The metal yielding rate and the steel pipe forming yield are improved, the production cost is reduced, and resources are saved.

The invention belonging to the field of smelting relates to a stainless steel smelting method.The invention is characterized in that the method comprises the following steps: 1) electric furnace smelting; 2) a intermediate frequency furnace melting alloy; 3) LF furnace heating; 4) VOD vacuum decarburizing; 5) VOD vacuum reducing and adding aluminum as the reductive in the vacuum state; 6) argon protecting and teeming.According to the invention, by adopting an electric furnace added with a intermediate frequency furnace and adopting a method of adding reductive under a vacuum state, the LF heating and reducing time is shortened, stay time of molten steel in ladle is reduced, steel-making cost is reduced and the manufacture security is improved. The technology has a remarkable economic benefit by producing stainless steel with a high alloy content. The reducing time is shortened from 7 hours primarily to 3-4 hours currently, therefore, the production efficiency is improved greatly, the forgeable pieces producing capability is extended and the economic benefit is remarkable.

The invention discloses a manufacturing method of an X100 high-steel-grade large-opening-diameter thick-wall longitudinal submerged-arc welded pipe. The manufacturing method comprises steel plate ultrasonic inspection, edge milling, edge pre-bending, JCO forming, pre-welding, inner welding, outer welding, welding line X-ray inspection, steel pipe diameter expanding, hydrostatic pressure testing, welding line ultrasonic inspection, pipe end X-ray inspection, chamfering, pipe end magnetic particle testing, and appearance quality inspection. A refined welding process comprises inner and outer welding four-wire submerged-arc automatic welding. The X100 high-steel-grade large-opening-diameter thick-wall longitudinal submerged-arc welded pipe manufactured by the method not only has the characteristics of high low-temperature impact toughness, good welding joint mechanical properties and the like, but also has relatively high pipe body uniform elongation rate.

The present invention relates to the technical field of processing methods for deep hole processing equipment, in particular to the process of toughening and straightening gun drill rods for deep hole processing, comprising the following steps: 1) material selection, pipe making and forming, selecting high-quality alloy steel, tool steel or Carburized steel, processed into a deep hole processing gun drill pipe before heat treatment; 2) heat treatment strengthening and toughening and straightening integration, the deep hole processing gun drill pipe before heat treatment is hung vertically on the tooling, deep The counterweight is mounted on the bottom end of the hole processing gun drill drill pipe for carburizing, quenching, self-alignment of the counterweight or quenching and self-straightening; 3) tempering, straightening, and cooling. Compared with the prior art, this The invention uses high-quality alloy steel, tool steel or carburizing steel as raw materials, and through heat treatment in a protective gas furnace, vacuum furnace, and high-frequency furnace, under the gravity of the counterweight, self-alignment or carburizing and quenching of carburizing steel improves The carbon content is lowered, the toughness is strengthened; the heat treatment is strengthened and toughened and straightened, and the tempering process is self-aligned.

The invention discloses a process for producing die steel by utilizing a converter continuous casting mode. The process comprises a steel making continuous casting process and a steel rolling process. The steel making continuous casting process comprises the following process steps of: converter smelting, LF (Ladle Furnace) refining, continuous casting, slow cooling and other process steps; and the steel rolling process comprises the following process steps of: heating, scale removal by using high pressure water, rolling, straightening, stacking, slow cooling and other steps. By using the die steel produced by the invention, the contents of gas and occluded foreign substances in the die steel can be reduced, the thermal stress and the structural stress for slowing a steel blank down are eliminated, a thick and nonuniform cast structure inside the steel blank is improved, and the problems of flaw detection disqualification and finished product crack of the die steel are solved. By using the process, the aim of producing the die steel by using a converter is achieved, the production cost is reduced, and the economic benefit is increased.

The invention relates to a method for preparing Ni-Mo-P nano-alloy thin film electrodes by electrodeposition of ionic liquids. The method successfully solves the problems of low current efficiency, high output of waste liquid and thin film Coarse tissue and high hydrogen-induced defects. The method for preparing Ni-Mo-P nano-alloy film electrode by ionic liquid electrodeposition comprises the following steps, adding phosphate, citric acid, molybdenum salt, nickel salt respectively in the ionic solvent that choline chloride and ethylene glycol mix, obtain ion Plating solution; using a brass sheet as a substrate, Ni-Mo-P nano-alloy thin film electrodes are prepared by electrodeposition on the brass sheet by a constant current method, wherein the phosphate is NaH 2 PO 2 , Molybdenum salt is (NH 4 ) 6 Mo 7 o 24 , nickel salt is NiCl 2 , the bath temperature is 60-80°C; the current density is 5-50mA / cm 2 , The electrodeposition time is 3-7min. The Ni-Mo-P alloy film electrode prepared by the present invention has good hydrogen evolution catalytic performance (η 200 =169mV, b=51.2mV / dec).

The invention relates to a high-strength toughness and high-strength plasticity automobile steel and a preparation method thereof, which belong to the technical field of manufacturing high-toughness, high-strength and high-strength plasticity automobile steel. Chemical composition of steel: C: 0.15‑0.60wt%, Si: 0‑2.0wt%, Ni: 0‑2.0wt%; Mn: 3.0‑6.0wt% and Al: 2.0‑6.0%, the rest is Fe and not Avoid impurity elements. On this basis, one or more of the following microalloying elements can be added, Nb: 0‑0.10wt%; V: 0‑0.10wt%; Ti: 0‑0.10wt% and Mo: 0‑0.10wt%, Cu : 0-0.50wt%, B: 0.0005-0.005wt%. The advantage is that through the alloying of C, Mn and Al, rolling and annealing in the dual-phase region, a multi-phase, multi-layer, and metastable microstructure is formed, and the V-type impact toughness at -40°C is not less than 120J , the strength-plastic product is not less than 50GPa%, and the cost is far lower than the traditional high-manganese steel and the comprehensive mechanical properties are much higher than the low-cost and high-performance of the medium-manganese steel. It can be used in the field of automobile body-in-white and transmission parts manufacturing in the form of rods or plates.