Online auction is a market economic process that takes the Internet as the platform and competitive price as the core, establishes the communication and interaction mechanism between producers and consumers, and jointly determines the price and quantity to achieve equilibrium. The so-called online auction refers to the price negotiation and trading activities carried out on the Internet, that is, the use of the Internet to publicly publish the information of the goods or services to be tendered on the website, and sell it to the highest or lowest bidder through competitive bidding. Its essence is a market economic process that takes competitive price as the core, establishes the communication and interaction mechanism between producers and consumers, and jointly determines the price and quantity, so as to achieve equilibrium. Online Auction,Online Auctions,Online Auction Antiques,Adesa Online Auction The universe in the stone is great , https://www.zdsarts.com
(1) Petroleum Steel Pipes The main importing countries of the Petroleum Steel Pipe include: Germany, Japan, Romania, the Czech Republic, Italy, the United Kingdom, Austria, Switzerland, the United States, and Argentina and Singapore. The import standards mostly refer to the American Petroleum Institute standards API5A, 5AX, 5AC. Steel grades are H-40, J-55, N-80, P-110, C-75, C-95, etc. Specifications are mainly 139.77.72R-2,177.89.19R-2,244.58.94R-2,244.510.03R-2,244.511.05R-2 and so on.
(2) There are three types of API specifications: R-1 is 4.88 to 7.62 m, R-2 is 7.62 to 10.36 m, and R-3 is 10.36 m to longer.
(3) Some of the imported goods are marked with LTC, which is the long thread buckle bushing.
(4) In addition to adopting the API standard for casings imported from Japan, a small number of Japanese manufacturers' standards (such as Nippon Steel, Sumitomo, Kawasaki, etc.) are also implemented. The steel grades are NC-55E, NC-80E, and NC-L80. NC-80HE and so on.
(5) In the case of claims, black buckles and thread buckles were damaged, the tube body was folded, the close distance between the broken buckle and the screw thread was out of tolerance, the external defects such as the coupling J value were poor, and the brittleness of the sleeve, low yield strength, etc. quality problem.
Oil casing is an important equipment for oil drilling. Its main equipment also includes drill pipes, core pipes and casings, drill collars and small-diameter drilling steel pipes. Domestic casing is made of hot-drilled or cold-drawn steel for geological drilling. The steel grade is referred to as “geology†(DZ), and commonly used casing grades are DZ40, DZ55, and DZ753.
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Steel pipe network 37Mn5 oil pipe is J55 oil pipe
37Mn5 oil pipe is J55 oil pipe, commonly used in tubing, casing, coupling materials.