48results about How to "Small amount of depression" patented technology

The invention discloses a process for producing thin gauge pipeline steel by using a double-stand medium and heavy plate mill. A plate blank with the thickness of 180 mm is used for producing the thin gauge pipeline steel with the thickness less than 10 mm. On the basis that the performance of a rolled piece meets requirements, the thin gauge pipeline steel with a good plate shape can be obtained by controlling the tapping temperature of the plate blank, the rough rolling broadening pass pressing rate, the longitudinal rolling pass pressing rate after rough rolling broadening pass, the rough rolling finishing temperature, the thickness of a middle blank, the finish rolling ending pass pressing rate, the finish rolling finishing temperature, the roller gap inclination and sled function in the rolling process, a high pressure water descaling system, the water entry temperature, the re-reddening temperature, and the head and tail shielding and straightening process of a laminar cooling system. The deformation rate is reduced, and the economic benefit is increased.

The invention discloses a super-hard austenitic stainless steel and a preparation method thereof. The super-hard austenitic stainless steel comprises the following chemical components by weight percent: 0.08-0.13% of C, 0.3-1.0% of Si, less than 2.0% and greater than or equal to 0.5% of Mn, 16.5-17.5% of Cr, 6.5-7.5% of Ni, 0.03-0.08% of N, 0.5-0.8% of Mo, greater than or equal to 0.040% of P, greater than or equal to 0.01% of S, Fe and unavoidable impurities; the temperature of Md30 is 30-60 DEG C. By controlling the tempering and cold rolling reduction rate to 35-45%, controlling the rolling speed to less than or equal to 5m / s and the rolling temperature to less than or equal to 30 DEG C, the transformation from the austenite to the deformation martensite is created and the hardness of the material is greatly increased under the same deformation; when the tempering and cold-rolling reduction rate is 35%, the hardness HV is greater than 550 and the anisotropy of the super-hard state steel is reduced.

The invention provides hot-rolled narrow strip steel for fan blades, and belongs to the field of special steel. According to the hot-rolled narrow strip steel and the preparation method, the heating temperature of a uniform heating section is controlled in a narrow range, the heating time of the uniform heating section is prolonged, the temperature uniformity of a casting blank is improved, the temperature difference in and outside the blank body is reduced, and the phenomena of bending and twisting of rolled pieces in the rolling process are avoided; the bouncing value of a rolling mill is reduced, the stability of the rolling process is improved, the finish rolling roller diameter difference is strictly controlled and the roller diameter of the finish rolling working roller is standardized, the roller diameter is arranged from large to small, the contact arc length of the small-diameter working roller and the rolled material is short, the rolling force, the friction force and the torque can be greatly reduced, and the rolling precision is improved. The data of the embodiment show that the product prepared by the method is high in dimensional precision, the AB difference is less than or equal to 0.01 mm, the three-point difference is less than or equal to 0.03 mm, the strip difference is less than or equal to 0.04 mm, the production requirements of fan blades can be met, the cost is not increased compared with the conventional production process, meanwhile, the implementation difficulty is low, and the method has extremely high generalization performance.

The invention discloses a control method of a hot rolling roughing mill. The method comprises the steps that a board blank enters a rough rolling area, load distribution of a slip pass is optimized again, and the board blank rolling reduction of the slip pass is reduced; the set value of rolling force of a roughing mill vertical roll of the board blank is adjusted, and the holding force is increased; the speed of the roughing mill vertical roll and a roller way when the board blank is gripped is adjusted, and the conveying speed is increased; and descaling water of the current pass of the board blank is eliminated, wherein the steel gripping signal of the roughing mill is judgment of rolling force at the moment of steel gripping. The technical problem that due to the slip phenomenon of a board blank in a roughing mill in the prior art, the board blank cannot be normally gripped, and accordingly normal production rhythm is affected is solved. The technical effect that rapid response isachieved when the board blank slides while being gripped in the roughing mill, the production accidents of board blank abandoning and rollback are avoided, and the production efficiency is improved are achieved.

The invention discloses a forming method of a copper / aluminum composite material with high interface bonding strength, belonging to the technical field of metal layered composite material preparation. This forming method processes the surface to be compounded of the copper plate and the aluminum plate to obtain a macroscopic uneven surface to be compounded, and uses a louver to polish the compounded surface. The direction of the stripes formed by grinding is perpendicular to the rolling direction, and then the copper plate and the Aluminum plates are stacked up and down or side by side to obtain copper / aluminum billets, followed by single-pass low-pressure cold rolling pre-compounding, then high-temperature short-term heating, and finally single-pass hot rolling final compounding to obtain high interface bonding Strong copper / aluminum composite. The invention has the advantages of low requirement on the capacity of the rolling mill required to produce the copper / aluminum composite material, simple process, and low production cost, and can obtain a macroscopic composite interface of a non-straight artificial structure and a microscopic composite interface of a particle pinning structure, and the interface is combined The strength is greater than or equal to 90MPa, and the range of applicable copper / aluminum composite materials is wide, which is easy for industrial promotion.

The invention provides a hot rolled narrow strip used for a stamping part, a preparation method and an application and belongs to the technical field of metallurgy. The prep ration method comprises the following steps: successively conducting heating, a first dephosphorization, roughing, a second dephosphorization, finish rolling and winding a casting blank so as to obtain a hot rolled narrow strip used for a stamping part. For the hot rolled narrow strip provided by the invention, the AB difference is less than or equal to 0.01mm; the difference of three points is less than or equal to 0.03mm; the difference of a cleaning rod is less than or equal to 0.04mm; the thickness of a sinter is less than or equal to 7 microns; the yield strength is 258-285MPa; the tensile strength is 364-385MPa;the percentage elongation after fracture is 44.0-46.0%, so the hot rolled narrow strip can meet the production demand of the stamping part; compared with a conventional production process, the cost isnot increased; meanwhile, with small implementation difficulty, the invention has high generalizability.