"EAC/SCC of 316 due to chlorides"

Question:

"Rock climbers in South Africa use Ubolts glued into holes in cliff face for safety anchors. Ubolts are cold drawn 316, then Ubent. Environment is salt spray at 20 to 40 Celsius. Tensile stress ranges from residual (bending bar to form Ubolt as well as from cold drawing operation) to small applied tensile due to installation into holes (some Ubolt to hole miasmatch, splays the legs). Yield strength supplied rod is 540 MPa, as opposed to annealed yield of 290 MPa. I know from NRC studies with XRD of steel that cold working of austemitic can result in high localized yield and thus VERY high residual stress. I want to assess possibility of chloride induced SCC/EAC. Do not have K1eac for 316 in highly cold worked condition. Can perhaps measure residual stresses by strain gaging method. Any input/suggestions? Would LOVE K1eac data (ambient temp, strained 316, high chlorides)."

Answer:

Your stated ambient temperatures are a little low as a driving force for chloride SCC. However, depending on the extent of exposure to salt spray, hydrogen embrittlement cracking over an extended time may be a potential risk. I do not have any K1 data for stainless steel for your mechanical property conditions.

 

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