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Leakages of Steam Flange Sealing
- Posted: 05/22/2023 07:05:34
- Hits: 160
In the ironmaking process, steam is mainly used to replace the gas inside the blast furnace body, gravity dust collector and hot blast stove, so that maintenance personnel can inspect and repair the equipment. At the same time, steam is also used for heat preservation of some equipment in the ironmaking...
Results of Stainless Steel 304 Flanges in Propylene
- Posted: 05/10/2023 07:05:37
- Hits: 16
3. Results Stainless steel has good corrosion resistance, especially intergranular corrosion resistance, so it is an ideal material for chemical equipment such as acid-resistant containers, pipes and heat exchangers. The raw material of the failed flange is severely sensitized, and carbides are precipitated...
Analyzing Failure of Stainless Steel 304 Flanges in Propylene
- Posted: 04/26/2023 03:04:18
- Hits: 14
Summary In order to find out the cause of the leakage of stainless steel flanges in the pressure pipes of a polypropylene plant in a petrochemical plant, the cracked and failed stainless steel flanges were detected and analyzed. The stainless steel flanges in the pressure pipeline of the polypropylene...
The Forging Process of Stainless Steel Flanges
- Posted: 02/22/2023 12:02:40
- Hits: 145
In the production of 38,000t product tankers, all connected pipes and reducing joints require high strength and corrosion resistance, and are all made from stainless steel (1Cr18Ni9Ti). Many connecting flanges must be forged and processed before use. Compared with ordinary carbon steel, stainless steel...
Analysis of the Cause and Recommendations for Welding
- Posted: 01/16/2023 05:01:20
- Hits: 18
1. The analysis of the failure According to the above analysis results, it can be known that the main reasons for the failure of the slip-on flange are as follows: (1) GB T 700-2006 standard stipulates that w(C) should be less than and equal to 0. 22% in Q235, and w (C) in this material is 0. 96%. In...
Measures to Prevent and Control Deformation Caused by Welding
- Posted: 11/29/2022 10:11:48
- Hits: 76
3.1 Welding sequences In view of the above structural characteristics of welding flanges and cylinders, when compiling the welding process, we can skillfully use the welding stress of the material to make it as far as possible to offset each other in the direction of action, as shown in Figure 3. The...
Deformation of Stainless Steel Slip-on Flanges After Welding
- Posted: 11/07/2022 08:11:17
- Hits: 62
In the manufacturing process of pressure vessels, due to the unbalanced heating of the workpiece in the welding process and the cooling after welding, welding stress will occur inside the workpiece. Residual deformation will easily happen after welding if effective preventive and control measures are...
Controlling Deformation of Slip-on Flanges with Large Diameters
- Posted: 10/08/2022 03:10:46
- Hits: 29
A batch of flanges for ethylene engineering are manufactured in a factory recently. There are some problems in the manufacturing process. One of the prominent problems is how to control the deformation of slip-on flanges with large diameters during assembly. This batch of slip-on flanges has...
The Analysis of Causes of Cracking of Austenitic Stainless Steel Flanges
- Posted: 06/28/2022 09:06:20
- Hits: 25
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: 47
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: 19
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: 23
(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...