Abstract
We performed corrosion case study and corrosion tests to assess the corrosion resistance of stainless steel type 304 pipes in tap water and hot water facilities. Circulating test equipment used for corrosion tests and two types of sample, plates and straight pipe specimens, were examined under different conditions of residual chlorine concentration in the test water. The results of case study analysis indicated that high degrees of pitting corrosion occurred on straight pipes with inner diameter < 50 mm. The results of corrosion tests showed that the residual chlorine concentration around the pitting corrosion of stainless steel type 304 was greater than 0.3 mg/L in the plate, regardless of the remaining chlorine concentration in the straight pipe specimens. These results suggest that straight pipes have higher corrosion susceptibility because of bending during production.
Highlights
Due to their superior corrosion resistance, stainless steel type 304 pipe began to be used in building facilities from the early 1980s, and the demand for use in water and hot water supply facilities has since increased several fold
The results of corrosion tests showed that the residual chlorine concentration around the pitting corrosion of stainless steel type 304 was greater than 0.3 mg/L in the plate, regardless of the remaining chlorine concentration in the straight pipe specimens
1) There was more corrosion of pipe parts
Summary
Due to their superior corrosion resistance, stainless steel type 304 pipe began to be used in building facilities from the early 1980s, and the demand for use in water and hot water supply facilities has since increased several fold. Many reports in the 1990s presented examples of stress corrosion cracking (SCC) of stainless steel type 304 used as hot water pipes [1] and corrosion resistant of the weld [2]-[10], a thing about is a representative memoir. Since the early 2000s, there have been increasing reports of pitting corrosion in straight stainless steel pipes [11] [12] [13] [14]. The corrosion study that paid its attention to the straight pipe (non-weld) is a report about SCC until now. It is a report “Effects of P and Cu on SCC Resistance of Austenitic Stainless Steel in Dilute NaCl Solution” [15]. There have been few studies regarding pitting corrosion of straight pipes in tap water environments
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