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Lei C.-P.,Huangshi Xinxing Pipes Co. | Zhang K.-N.,Xinxing Ductile Iron Pipes Co. | He X.-F.,Huangshi Xinxing Pipes Co.
Zhuzao/Foundry | Year: 2014

Aiming to ductile iron pipe fittings product interface type and the characteristic of the species diversity, in order to reduce the mold production costs, the mold design of pipe fittings was optimized, the mold was produced with the swap interface and assembling mode, the exchange of various form interface was achieved for the same specification pipe fitting product. By designing of the interchanging type assembled pattern, various specifications and varieties of pipe fittings were used flexibly, the mould production costs on the basis of the original save 40%-50%.


Patent
Xinxing Ductile Iron Pipes Co., Beijing Changxing Kaida Composite Material Development Co. and Tang | Date: 2012-12-26

A novel material used for a bearing ring and a production process thereof is directed to a bimetallic composite pipe and a production process thereof. The aim of the disclosure is to provide a novel material used for a bearing ring and a production process thereof, in which high hardness, high wear resistance and high toughness, high impact toughness are interacted. The novel material used for a bearing ring according to the invention is composed of an annual clad layer and a base layer. The clad layer and the base layer is metallurgy bonded together in radial direction of a ring. The clad layer is made of bearing steel material, and the base layer is made of the material selected from bearing steel, straight carbon steel, high strength low/medium alloy steel or stainless steel.


Zheng L.,Hebei University of Engineering | Zhen L.,Hebei University of Engineering | Wang J.,Xinxing Ductile Iron Pipes Co. | Liu J.,Xinxing Ductile Iron Pipes Co. | And 2 more authors.
Jinshu Rechuli/Heat Treatment of Metals | Year: 2016

Effects of subcritical quenching process and original structure on microstructure and properties of a novel steel for perforating gun barrel were investigated. The results show that with subcritical quenching temperature increasing, the grain of the steel increases, and the hardness increases first and then decreases. With the increase of the tempering temperature, the hardness and strength of the steel decrease, while shrinkage of section and the impact energy increase. The best heat treatment process is 840 ℃ subcritical quenching and 560 ℃ tempering, and treated with this process for the as-quenched and tempered steel the comprehensive mechanical properties of are the best. © 2016, Chinese Mechanical Engineering Society of Heat Treatment. All right reserved.


Zhao L.,Hebei University of Engineering | Li C.,Hebei University of Engineering | Zheng L.,Hebei University of Engineering | Wang L.,Xinxing Ductile Iron Pipes Co.
Advanced Materials Research | Year: 2013

The metallurgical composite bimetallic tube, Incoloy825/X60, has been manufactured by a novel centrifugal casting plus extrusion compound technique. Based on the Incoloy825/X60 bimetallic tube, the limiting inner pressure and stress distributions were investigated by the finite element analysis software ABAQUS. The results indicate that the pressure-resistant capacity of the metallurgical composite bimetallic tube is equivalent to the internal metal in elastic state while the limiting inner pressure is much larger than the single metal tube with the same sizes in plastic state. The pressure-resistant capacity of the metallurgical composite bimetallic tube has increased more than two times compared with the external metal tube because of the transition layer which has a complete metallurgical bonding. © (2013) Trans Tech Publications, Switzerland.


Zheng L.,Hebei University of Engineering | Li C.,Hebei University of Engineering | Wang L.,Xinxing Ductile Iron Pipes Co. | Song Y.,Xinxing Ductile Iron Pipes Co.
Key Engineering Materials | Year: 2011

Based on the finite element analysis software ABAQUS, the CT specimens of bimetallic material and the metallurgical composite bimetallic pressure tube with axial crack were simulated on the fracture mechanical properties, after that the crack growth residual strength and the plastic failure stress of the metallurgical composite bimetallic pressure tube model were obtained. The results indicate that the crack growth residual strength generates near the crack tip and the crack growth residual strength of the pressure tube model is smaller than the CT specimens. Meanwhile, the plastic failure stress values obtained from the CT specimens and the pressure tube model are basically consistent with the theoretical calculative values. With the crack depth a increasing, the plastic failure stress values will be reduced. For the same crack depth, the plastic failure stress values of the pressure tube model are slightly lower than the CT specimens and the theoretical calculative values.


Patent
Xinxing Ductile Iron Pipes Co. | Date: 2014-07-02

A spigot-and-socket conduit joint comprises a socket whose end radially inwardly extends to form an annual wall and a spigot whose outer wall near the end is provided with a collar of the spigot. A stopper is provided between the socket and the spigot and comprises a number of front stoppers and rear stoppers. The front end of the front stopper is a front abutment end, and the rear end is a front contact end which is provided with a first and second front contact surfaces. The rear end of the rear stopper is a rear abutment end, and the front end is a rear contact end which is provided with a first and second rear contact surfaces. A number of front stoppers and a number of rear stoppers are alternately arranged into a ring. The front abutment ends of several front stoppers are against the annular wall of the socket, and the rear abutment ends of several rear stoppers are against the collar of the spigot. The first and the second front contact surfaces of each front stopper are closely contacted with the second and the first rear contact surfaces of an adjacent rear stopper, respectively. The spigot-and-socket conduit joint has the advantages of simplifying the manufacturing process, reducing the manufacturing cost and improving the bearing strength of the socket.


Disclosed is a spigot-and-socket pipe joint. A stopper ring of the joint has a split structure comprising a plurality of stoppers (1). Two or more fixing holes are provided in the face of the outer diameter of each stopper for installing an elastic support (5). During installation, the stoppers are first installed in a stopper chamber one by one to form a whole and finally a spigot is installed into a socket. During the installation, a spigot projection can push the stopper to move backwards and compress the elastic support on the stopper ring when passing through the stopper ring, and the spigot projection would pull the spigot back after passing through the stopper ring, so that the stopper presses against the outer surface of the spigot by the elastic support. The spigot-and-socket pipe joint in the invention has simple structure, convenience in installation and disassembly, strong anti-slip capability and wide application.


Patent
Xinxing Ductile Iron Pipes Co. | Date: 2014-04-02

A spigot-and-socket conduit joint with an anchor structure is disclosed. At least one group of anti-slip bosses is provided on a stopper of the joint. A fixing hole is provided in the panel of the stopper between the projections of every group of bosses. A rubber block is fixed to the stopper through the fixing hole. After the stopper is inserted between the socket and the spigot through the stopper mounting groove in an annual wall at the end of the socket, the stopper is installed in position by rotating circumferentially along the outer wall of the spigot. The rubber block attached to the stopper is located at the right side of the inner incline of the annual wall at the end of the socket, in the meanwhile, the stopper is pressed against the outer surface of the spigot tightly by the rubber block, thus enabling to effectively prevent the stopper from displacing or rather dropping out. The spigot-and-socket conduit joint with the anchor structure according to the invention has simple structure, convenient and rapid installation, better anti-slip capability and wide application.


The present invention relates to a composite anti-corrosion inner lining containing a water-borne epoxy coating sealing coat and an application thereof. The composite anti-corrosion inner lining comprises a cement mortar inner lining layer and the water-borne epoxy coating sealing coat coated on the cement mortar inner lining layer. The composite anti-corrosion inner lining has the advantages of preventing the precipitation of alkaline substances and harmful components from the cement mortar; the water in the cement mortar can be sealed by the water-borne epoxy coating sealing coat so as to prevent the generation of cracks; the composite anti-corrosion inner lining simultaneously poses the active anti-corrosion function of a cement mortar inner lining and passive anti-corrosion function of an organic coating; the roughness coefficient of the cement mortar inner lining can be reduced; and the composite anti-corrosion inner lining can withstand the water pressure changes in the water conveying process without being damaged.


Patent
Xinxing Ductile Iron Pipes Co. | Date: 2015-02-25

The invention discloses a composite anti-corrosion coating for a buried ferrous metal-based pipeline. The anti-corrosion coating contains a zinc-aluminum-rare earth alloy layer, a zinc-aluminum-rare earth pseudo-alloy layer or a zinc-aluminum-magnesium-rare earth multi-element pseudo-alloy layer, wherein the zinc-aluminum-rare earth alloy layer comprises the following components in percentage by weight: 4.7-60% of Al, 0.02-5% of RE and the balance of Zn; the zinc-aluminum-rare earth pseudo-alloy layer comprises the following components in percentage by weight: 5-60% of Al, 0.02-10% of RE and the balance of Zn; and a zinc-aluminum-magnesium-rare earth metal coating comprises the following components in percentage by weight: 5-85% of Al, 0.01-5% of RE, 30-95% of Zn and 0.05-10% of Mg. The coating disclosed by the invention has the advantages of low porosity, good self-sealing effect, stable anti-corrosion performance, low manufacturing cost, good economic applicability and the like, and can be applied in a highly corrosive soil environment.

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