Stainless steel butterfly valve rust stainless steel butterfly valve solution

Stainless steel butterfly valve rust phenomenon occurs during use. After metallographic analysis, dyeing test face, heat treatment test face, SEM and other test analysis, the key factor to find out the material corrosion is that the carbides along the grain boundary in the material form a chromium-depleted zone, resulting in corrosion of the stainless steel butterfly valve. Stainless steel butterfly valve rust solution 1 test method Shanghai Hongfeng Valve Reference: Sampling for chemical composition analysis (to determine compliance with the standards), metallographic examination, heat treatment process test and SEM analysis. 2 test results and analysis 2.1 Chemical composition Chemical composition analysis results and standard components. 2.2 Metallographic analysis From the rust phenomenon of the butterfly valve cut the metallographic sample, after grinding polishing, corrosion with aqueous ferric chloride, Neophot-32 metallographic microscope was observed and analyzed, the microstructure of austenitic Body with another precipitate composition. In theory, the normal austenitic stainless steel after heat treatment should be uniform austenite. Another precipitate appears in the organization what is tissue, there are two judgments: one is σ phase, the other is carbide. The conditions for the formation of sigma phase and carbides are different, but all have one common feature that is the sensitivity of austenitic stainless steel to intergranular corrosion.

DIN Slip On Flange

Across the pond, you will find the Deutsches Institute fur Normung (DIN) flange specification, consisting of a variety of European styles which have been unified into one code for the purpose of commonality. Designation as a DIN Flange by the German Institute of Standardization assures the user of design quality the way an ASME flange would here in America. Although much less common than ANSI/ASME steel flanges in the United States, many of our international customers request flanges to these specifications for a variety of applications such as imported steel vessels, cargo ships, and other infrastructure which may consist of metric pipes/valves and European designed equipment.

The subset flanges under the DIN standard consist of the same style of flanges in the United States, including the most commonly used slip on flanges, weld neck, flanges, and blind flanges. Adapter flanges can be custom made to end user requirements for the mating of American flanges to international ones, however we find it is a much more common and easy solution to provide DIN flanges to mate to existing equipment.

The most common metric type flanges fall under the following categories:

DIN 2501 through 2503 for flat ring flanges

DIN 2512 through 2519 for alternate face flanges

DIN 2627 through 2633 for weld neck flanges

DIN 2641 through 2642 for lap joint flanges

DIN 2565 through 2569 for threaded/companion flanges

DIN 2527 for blind flanges

Slip On Flange,Pn6 So Flange,Din Cs Flange,Din Slip On Flange

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