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The Analysis of Causes of Cracking of Austenitic Stainless Steel Flanges
- Posted: 06/28/2022 09:06:20
- Hits: 22
1. Comprehensive analysis Combined with the above physical and chemical test results and operating conditions of the flange, the following analyses are carried out. (1) Sensitive materials There are a lot of precipitates on the grain boundaries of the flange microstructure, and the production of...
Physical and Chemical Inspection of Cracking of Austenitic Stainless Steel Flanges
- Posted: 06/09/2022 11:06:28
- Hits: 36
During the production and operation of a chemical plant, it was found that there was a leakage in the flange neck. After observation, it was found that there were cracks in the flange neck along the circumferential direction, as shown in Figure 1. The internal medium of this flange is aviation kerosene....
Simulation Tests of Failures Caused by Pickling Corrosion of SS Flanges
- Posted: 04/22/2022 09:04:43
- Hits: 17
1. Welding simulation tests Austenitic stainless steel has excellent corrosion resistance, but carbide aggregates at the grain boundary at the welding seam part, especially the heat-affected zone in actual production. Finally, intergranular corrosion occurs due to the corrosive medium. Therefore, to...
Electric Arc Materials Adding for Nuclear Grade Flanges (Part Two)
- Posted: 02/10/2022 08:02:12
- Hits: 22
(2) Microstructure After the arc additive TIG surfacing of the flange simulation part is completed, the metallographic samples are ground from the fusion line and the center of the surfacing layer respectively, and they are etched with ferric chloride plus hydrochloric acid solution. Observe...
Electric Arc Materials Adding for Nuclear Grade Flanges (Part One)
- Posted: 01/27/2022 08:01:51
- Hits: 33
Abstract: According to the corrosion status of the flange surface of a certain pipe end of a nuclear power plant and the site construction conditions, the method of arc materials adding of the flange surface was studied. Through the demonstration and analysis of the arc surfacing test of the...
The Calculation of the Flange Under the Internal Pressure and External Load
- Posted: 11/13/2021 08:11:32
- Hits: 2071
Abstract: In the design and manufacture process of the pressure vessel, the selection and design calculation of flanges have always been an unavoidable important content. Flanges for pressure vessels (forced sealing flanges) are often subjected to not only internal pressure but also axial...
Why Is It Not Recommended to Use SS304 for Sealing Bolts of Flange Connections?
- Posted: 10/16/2021 11:10:30
- Hits: 574
When the carbon steel or stainless steel flange is equipped with SS 304 bolts in the flange's sealing, leakages often occur in the operating state. (1) What are the differences between 304, 304L, 316 and 316L? 304, 304L, 316 and 316L are commonly used stainless steels in flange connections, including...
Anti-corrosion Technology of Oil and Gas Pipeline's Flanges and Bolts (Part Three)
- Posted: 09/12/2021 09:09:40
- Hits: 28
1.6 Viscoelastic anti-corrosion systems The viscoelastic body is mainly an anti-corrosion product developed by the Dutch company STOPAQ. It is a polyolefin-based flexible heavy-duty anti-corrosion material with a single-molecule non-bonded structure. This single-molecule non-bonded structural feature...
Anti-corrosion technology of oil and gas pipeline's flanges and bolts (Part Two)
- Posted: 08/24/2021 10:08:27
- Hits: 38
1.2 Molybdenum disulfide or grease The anti-corrosion technology of applying molybdenum disulfide or grease (calcium based grease) is one of the common ones used in anti-corrosion for metal. Because of the adhesion and lubricity of Molybdenum disulfide or grease, it can effectively...