How to deal with electrochemical corrosion of astm a179 cold drawn steel pipe

    (1) ASTM A179 cold drawn steel pipe with carbon steel pollution: contact with carbon steel caused by scratches and corrosive media to form the original battery and electrochemical corrosion.

    (2) ASTM A179 cold drawn steel pipe cutting: slag, splash and other easy to rust the material attached to the corrosive medium and the formation of the original battery electrochemical corrosion.

    (3) Heating: the composition of the flame heating area and microstructure changes and not uniform, and the formation of the original medium of corrosive media and electrochemical corrosion.

    (4) ASTM A179 cold drawn steel pipe welding: physical defects in the welding area (undercut, pores, cracks, not fused, not welded, etc.) and chemical defects (coarse grain, grain boundary poor chromium, segregation, etc.) and corrosive media to form the original Battery and produce electrochemical corrosion.

    (5) Material: chemical defects of cold drawn steel (uneven composition, S, P impurities, etc.) and surface physical defects (loose, trachoma, cracks, etc.) is conducive to the formation of the original medium with corrosive media and electrochemical corrosion.

    (6) Passivation: pickling passivation effect is not good caused by cold-drawn steel pipe surface passivation film is uneven or thin, easy to form electrochemical corrosion.

评论

发表评论

此博客中的热门博文

SMLS steel pipe for Tanzania Gas pipeline project

图片
Project location: Tanzania Product：SMLS steel pipe Specification：168.3mm*14.27mm*SDR Standard and material：API 5L X52N PSL2 Application: Gas pipeline project In the last week of September, we received a new inquiry from regular customer who stated that it would take 4 weeks for delivery, including anti-corrosion. We learned that the fast delivery is most important point for this order. Xinyue people responded the fastest. Due to this order is for X52N PSL2 G high-grade seamless pipes, the stock quantity cannot meet the quantity of the entire order. With the strong resource integration ability of Xinyue, we found the production schedule of the steel pipe factory within 3 days and quickly organized new production. The customer arranges full process supervision from end customers, contractor customers, intermediate customers, and third parties from raw materials to the factory. During the supervision process of steel pipe production, they all witness the online UT test, Hydrostatic test, ...
阅读全文

Treatment method of steel pipe welding slag inclusion

What is welding slag inclusion? Welded pipe slag inclusions are slag that remains inside the weld. Welding slag inclusions are generally divided into two categories: The first category is metal slag inclusions. The second category is non-metallic slag, which refers to the slag remaining in the weld after welding, including electrode coating or flux, sulfide, oxide and nitride. According to its formation, it can be divided into point-like slag inclusions, linear slag inclusions, chain-like slag inclusions and dense slag inclusions. Slag inclusions will reduce the plasticity and toughness of steel pipe welds, and slag inclusions with sharp corners will cause stress concentration at the tip, and the tip will develop into a crack source, especially in welds with a large tendency to air quenching. Under the action of stress on the steel pipe, cracks will first appear at the slag inclusions in the weld and develop along the way, resulting in a decrease in strength and cracking of the weld. T...
阅读全文

ERW Steel Pipe Deliver to Argentina for oil and gas pipeline

图片
Project location：Argentina Product：ERW Steel Pipe Standard and material：API 5L PSL2 46th GR.X60M Specifications： OD: 457.2mm WT: 9.52mm Lenght:12M Application：oil and gas pipeline In the steel industry, customer demands vary, but quality and delivery time are always the most critical factors. Recently, Xinyue successfully provided a high-quality ERW pipe solution for a customer, and the entire process took only half a month, perfectly demonstrating our ability to respond quickly and execute efficiently. Although the customer’s order quantity was small, the steel grade requirements for the pipes were very high, and the supplier had to be listed in the client’s approved supplier directory. Facing such strict requirements, Xinyue mobilized all available resources and actively engaged with major suppliers. Ultimately, we successfully sourced BaoSteel’s inventory, which perfectly met the steel grade and quality requirements, and ensured on-time delivery. From receiving the inquiry to finali...
阅读全文