case study
10 000
6661
2228
1030
1 000
164
100
94
17
10
5.2
1
1.5
1
Mild Steel
Corten
Zinc
Copper AA 3103 3CR12 SS430 SS304 SS316
Average
Mild Steel
Corten
Zinc
Copper
AA 3103 3CR12 SS430 SS304 SS316
Severe Marine
245.33
75.03
11.72
2.86 4.16 1.14 1.71 0.87 1.85 0.60 1.88
2.22 0.48 0.58 0.38 0.45 0.29 0.03 0.63
1.518 0.716 0.152 0.817 0.153 0.036 0.001 0.485
0.251 0.095 0.050
0.047 0.021 0.009
0.032 0.017 0.003 0.020 0.005
Aggressive Marine
98.34 43.05 24.45 31.45 17.54
118.68 72.85
Industrial Marine
25.10 16.05 13.82 12.54
2.35 5.82 3.12 1.51 0.32
Medium Marine
Marine
0.053 0.012 0.000 0.007
0.048
Inland Industrial
Rural
5.35
2.99
0.000 0.025
0.000 0.013
Average
66.50
37.74
13.96
Theoretical comparisons This graph shows the relative life span of various materials compared under the same functional conditions. Carbon steel is the base for the comparison. As an example, this would indicate that in conditions where mild steel would last one year, grade 3CR12 would last an estimated 164 years. The table shows the result of corrosion tests done on various materials under various corrosive conditions. The bottom row shows the average over the range of conditions. For example, under severe marine conditions, grade 316 will suffer a material loss of 0.032% per year whilst 3CR12 will an estimated 1.518% loss over the same period. Conclusion It is important to ensure that that when working with stainless steel grade selection, the application and the operational conditions are well defined. This will assist in selecting the grades that might be suitable for the application. Corrosion rates on stainless steel are determined
by alloy composition, surface finish and condition, availability of environmental oxygen, level of chlorides, solution strength and temperature. When all the information on the application is available Iso-corrosion diagrams can be used to narrow down the list of potential suitable grades. It is then advisable to do a physical test on samples of the shortlist of alloys under the operational conditions to make a final decision.
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Issue 1 – 2026
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