A193 B8 CL2 vs A193 B16
A193 B8 CL2 vs A193 B16
(OP)
How does the high temperature performance (above 1000 degrees) differ between these two grades? According to ASTM A193 the yield strength for B8 class 2 (strain hardened 304) is almost the same as B16 (cr-mo-va), 100 ksi vs. 105 ksi. My understanding is 304 shouldn't be used above 900 degrees. Does this apply to B8?
The application is under hood automotive, the fastener should be exposed to little moisture and no harsh chemicals. Should corrosion failure of B16 be a major concern?
The application is under hood automotive, the fastener should be exposed to little moisture and no harsh chemicals. Should corrosion failure of B16 be a major concern?





RE: A193 B8 CL2 vs A193 B16
However, it is important to note that these are two dissimilar materials with different coefficients of expansion. The AISI Type 304, which is an austenitic stainless steel, will expand at a greater rate (9.2 X E^-6 in/in degF) in comparison to B16 (7.4 X E^-6 in/in/degF), which is a ferritic material. This should be taken into account when used in bolting applications. I personally would avoid using dissimilar materials for bolting connections.