Abstract
Life estimation was performed for the stress corrosion cracking (SCC) that occurs in deaerated and wet hot pure steam at the bottoms of the threads of bolts made of SCM435 (equivalent to AISI 4137) used in steam turbine. SCC is believed to occur when corrosion pits are formed and grow to critical size, after which SCC is initiated and cracks propagate until the critical fracture toughness value is reached. Calculations were performed using laboratory and field data. The results showed that, for a 40 mm diameter bolt with 0.2% offset strength of 820 MPa, the critical crack depth for straight-front cracks was 5.4 mm. The SCC life depends on the lubricant used; the SCC life estimated from this value is approximately 70 000 hours when graphite is used as a lubricant.
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