What is IGC practice- C test as per ASTM A262 practice?
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ASTM A262 standards have 5 different corrosion tests to test the susceptibility of Austenitic stainless steel to intergranular corrosion. IGC practice – C is one of those 5 tests.
IGC practice- C involves the following steps:
a. The austenitic stainless-steel sample is dipped in boiling, 65% Nitric acid for 48hrs duration.
b. After the first cycle, the sample is weighed to know the loss of weight due to corrosion. The loss is forecasted and expressed in terms of mills per year [Mpy].
c. The same cycle is repeated for the next 4 times. So in total, 240 hrs test duration in 5 different intervals. Each interval constitutes 48 hrs.
d. The weight loss is calculated for all 5 cycles and an average value is found out.
e. The average value should be less than the allowable value to accept the material. In general the allowable corrosion rate followed industry is 18 Mills per year (Mpy)