The invention relates to an anti-crack and scratch-proof iron-based alloy coating used for thermal spraying. The coating is formed through thermal spraying of powder made of a metal material, the metal material of the coating comprises the following chemical components according to weight percentage: 4.1 to 6.5 percent of Cr, 0.33 to 0.42 percent of C, 0.8 to 2.0 percent of Si, 0.8 to 1.4 percent of Mn, 0.21 to 0.34 percent of Nb, 0.62 to 0.88 percent of Al, 0.64 to 0.77 percent of Ti, 0.28 to 0.39 percent of Co, 0.5 to 2.0 percent of Ni, and 0.47 to 0.53 percent of V, wherein the sum of the Mn and the Ni accounts for 1.2 to 3.5 percent, at least one of the Mo and the W is contained, the total content is 2 to 5 percent, lanthanide rare earth accounts for 0.51 to 0.63 percent, and the rest is Fe and inevitable impurities; the coating adopts the microscopic structure that Cr7C3 strengthening phases are spread in an austenite; the lanthanide rare earth comprises the following components in percentage by mass: 10 to 15 percent of cerium, 10 to 13 percent of terbium, 15 to 22 percent of gadolinium, 12 to 15 percent of neodymium, 7 to 14 percent of dysprosium, and the balance of lanthanum, and the sum of all the components is 100 percent. The iron-based compound spraying powder provided by the invention is relatively good in high-temperature oxidation resistance, and over oxidation during a spraying process can be avoided, therefore, internal combination compactness inside the coating after spraying is improved, moreover, after spraying, pores in the coating after spraying are moderate in size and smooth in shapes, and cracks can be reduced effectively.

Anti-crack and scratch-proof iron-based alloy coating used for thermal spraying and preparation method thereof

The present invention discloses a high wear-resisting iron-base thermal spraying coating material, the high wear-resisting iron-base thermal spraying coating powder is made of a metal material, the metal material comprises the following the chemical components by weight: 10-18% of Cr, 0.20-0.50% of C, 0.8-2.0% of Si, 1.5-3.0% of Mn, 0.62-0.88% of Al, 0.55-0.87% of Ti, 0.5-2.0% of Ni, Mn and Ni with the total content of 3.2-3.6%, at least one of Mo and W with the total content of 1-8%, 0.41-0.63% of lanthanum rare earth, and balance of Fe and unavoidable impurities; the coating microstructure is Cr7C3 strengthening phase dispersed austenite, the lanthanum rare earth comprises the following the components by mass: 4-11% of cerium, 10-13% of terbium, 15-22% of gadolinium, 12-15% of praseodymium and balance of lanthanum, the total content of the cerium, terbium, gadolinium, praseodymium and lanthanum is 100%, and the iron-base composite coating powder has good high temperature oxidation resistance, can avoid excessive oxidation in the process of spraying so as to improve the compactness of internal combination of the sprayed coating, the sprayed coating is moderate in pore size and smooth and round in shape, the production of cracks can be effectively reduced, and the tank body oil storage function can be well played.

High wear-resisting iron-base thermal spraying coating material and preparation method thereof

The invention discloses a method for manufacturing an offshore oil and gas drilling platform box thin-wall casting. The method is characterized by comprising following steps: firstly, shell preparation including a, wax mold preparation, b, wax mold preparation, c, wax mold slurry moistening and shell making, c, wax removal and d, shell roasting; secondly, smelting, wherein burdens are loaded in an electric furnace firstly, after all the burdens are completely melted down, a slag removal agent is used for covering the liquid face, the temperature of molten steel is controlled to range from 1540 DEG C to 1580 DEG C, after an alloy is melted down, sampling is carried out, the temperature is kept between 1560 DEG C and 1600 DEG C, power failure and slagging off are carried out, the slag removal agent is added for covering, the temperature rises to the tapping temperature, a steel ladle is lifted, and before the steel ladle is lifted to the position in front of an electric furnace, the interior of the electric furnace is subject to complete deslagging, tapping is carried out, and molten steel is obtained; thirdly, casting, wherein during casting, flow scattering and breaking should be prevented; fourthly, sand removal, gas cutting and heat treatment; sixthly, finishing, wherein the gas cutting or plasma manner is used for removing casting defects, and grinding is used for removing casting gating and risering roots. The method for manufacturing the offshore oil and gas drilling platform box thin-wall casting has the beneficial effects of being good in forming quality, high in production efficiency and the like.

Method for manufacturing offshore oil and gas drilling platform box thin-wall casting

The invention relates to a processing technology for seal rings used for valves, and belongs to the technical field of valve devices. The processing technology includes the steps that firstly, raw materials are smelted; secondly, wax mould preparation is conducted; thirdly, shell mould sand moulds are manufactured on wax moulds prepared in the second step; fourthly, shell mould roasting is conducted; fifthly, pouring is conducted; sixthly, grinding, polishing and cleaning are conducted on blanks of the seal rings used for the valves; seventhly, zinc-nickel alloy clad layers are electroplated on the surfaces of the blanks of the seal rings used for the valves; eighthly, grooves are formed in the side walls of the blanks of the seal rings used for the valves in the direction pointing to thecircle centers, rubber seal rings are embedded in the grooves, and the seal rings used for the valves are manufactured; and ninthly, the seal rings used for the valves are checked one by one, the sealrings with defects on surface coatings are removed, and the seal rings checked to be qualified are put in storage. According to the seal rings used for the valves, due to the adoption of the demoulding foundry technology, the size is more precise, and sealing performance reduction caused by size deviation is effectively prevented.

Processing technology for seal rings used for valves

The invention relates to a processing technology of a corrosion-resistant flange for a valve, and belongs to the technical field of valve equipment. The processing technology includes the steps that (1) raw materials are smelted; (2) a shell mould is prepared; (3) the shell mould is roasted; (4) pouring is conducted; (5) after pouring molding, a to-be-cast casting is cooled to room temperature, demoulding is conducted by crushing the shell mould, then a heat insulting feeder of the casting is cut off, and the casting is obtained; (6) the casting is ground and polished, and placed in an industrial detergent after being ground and polished, and cleaning is conducted by using an ultrasonic generator; (7) the casting after being cleaned through ultrasonic is washed by using water; (8) the casting is dried by using a hot air fan; (9) a zinc-nickel alloy plating layer is electroplated on the surface of the casting; and (10) a pure aluminum plated layer is coated with a refractory coating through a method of atomizing spraying. According to the processing technology of the corrosion-resistant flange for the valve, the corrosion-resistant flange for the valve cast by using the mass percentof components of the processing technology has the advantages of being corrosion-resistant, high-temperature-resistant, high in strength and long in service life.

Processing technology of corrosion-resistant flange for valve

The invention relates to a flange fast and firm in connection. The flange fast and firm in connection comprises a first flange body, a second flange body, a sealing gasket, a fastening bolt and a nut. The corresponding positions of the first flange body and the second flange body are each provided with at least two arc-shaped holes. The fastening bolt sequentially penetrates the arc-shaped holes in the first flange body and the arc-shaped holes of the second flange body and is connected with the nut in a threaded manner. The sealing gasket is arranged between the first flange body and the second flange body. The side, close to the first flange body, of the second flange body is provided with an annular connecting block. An external thread is machined on the outer side of the annular connecting block. A connecting groove matched with the annular connecting block is formed in the first flange body. An internal thread matched with the external thread of the annular connecting block is machined on the inner wall of the connecting groove. According to the flange fast and firm in connection, the first flange body and the second flange body are connected through the thread of the connecting block firstly and thereafter connected through the bolt when connected, and the two connecting manners are matched mutually, so that connection of the first flange body and the second flange body is firmer and more stable, and the problems of leakage and the like caused by infirm connection are reduced greatly.

Flange fast and firm in connection

The invention relates to a multi-pipeline connecting flange which comprises a first flange body, a second flange body, a sealing gasket, fastening bolts and nuts. The sealing gasket is arranged between the first flange body and the second flange body. The corresponding positions of the first flange body and the second flange body are each provided with at least two pipe containing holes and are further each provided with at least two fastening through holes. The fastening bolts sequentially penetrate the fastening through holes of the first flange body and the fastening through holes of the second flange body to be in threaded connection with the nuts. According to the multi-pipeline connecting flange, due to the fact that the corresponding positions of the first flange body and the second flange body are each provided with the at least two pipe containing holes, multiple pipelines can be connected at the same time, the engineering efficiency is greatly improved, manpower and material resources are saved, and the construction progress is accelerated.

Multi-pipeline connecting flange

The invention relates to a filter flange fast and convenient to connect. The filter flange comprises a first flange, a second flange, a round filter screen, fastening bolts and nuts. One or more kidney-shaped holes are formed in the corresponding positions of the first flange, the second flange and the round filter screen. Each fastening bolt sequentially penetrates the first flange, the round filter screen and the second flange and is in threaded connection with the corresponding nut. One or more sealing washers are arranged between the first flange and the second flange. When the filter flange fast and convenient to connect is mounted, the first flange, the second flange and the round filter screen can be fixed only by making the bolts sequentially penetrate the kidney-shaped holes, it is not needed to slowly align mounting holes in the first flange, the second flange and the round filter screen in sequence, and therefore mounting efficiency is greatly improved; the flange can be mounted efficiently, fast and conveniently; and the progress of a project can be effectively accelerated.

Filter flange fast and convenient to connect

The invention discloses a rare earth element coating for high-strength supports and a treatment process thereof. The rare earth element coating comprises the following chemical components in percentage by weight: 0.8-3.0% of Re, 50-53% of Ni, 19-31% of Cr, 1.7-5.4% of Si, 0.5-0.8% of S, 0.6-2.5% of C, 1.5-9% of Mn, 0.8-1.5% of composite rare earth and the balance of Fe; and the composite rare earth comprises the following components in percentage by weight: 13-15% of Y, 9-11% of Sc, 4-6% of Gd, 6-6.5% of Sm, 13-16% of Ce, 12-19% of Pr and the balance of La. The rare earth element coating for high-strength supports and the treatment process thereof disclosed by the invention can solve the problems of poor corrosion resistance and strength and short service life of existing boiler pipe supports, and the rare earth element coating has the advantages of smoothness, no pollution in production, stable surface quality and the like.

Rare earth element coating for high-strength supports and treatment process thereof

The invention relates to an efficient sealing flange which comprises a first flange body, a second flange body, a round filter screen, fastening bolts and nuts. The corresponding positions of the first flange body, the second flange body and the round filter screen are each provided with arc-shaped holes. Each fastening bolt sequentially penetrates the corresponding arc-shaped hole of the first flange body, the corresponding arc-shaped hole of the round filter screen and the corresponding arc-shaped hole of the second flange body to be in threaded connection with the corresponding nut. An annular connecting block is arranged on the side, close to the first flange body, of the second flange body. An external thread is manufactured on the outer side of the annular connecting block. A connecting groove is formed in the first flange body, and an internal thread is manufactured on the inner wall of the connecting groove. The surfaces of the opposite sides of the first flange body and the second flange body are covered with a first rubber sealing layer and a second rubber sealing layer correspondingly. The side, in contact with the first flange body, of each fastening bolt and the side, in contact with the second flange body, of each nut are covered with a third rubber sealing layer and a fourth rubber sealing layer correspondingly. The edge of the outer side of the round filter screen is covered with a rubber sealing ring. According to the efficient sealing flange, by means of the cooperation of the four rubber sealing layers, it is guaranteed that the sealing performance of the flange is efficient and stable, and the flange is prevented from leaking at the connecting position.

Efficient sealing flange

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