![]() ![]() ![]() Blistering, HIC and SOHIC damage issimilar to that found in wet H2S (see 5.1.2.3).5.1.2.4.9 References1. ![]() Ni)/15d) ASTM A193 grade B7M bolts are softer and lower strength than B7 bolts and are more resistant to cracking.e) Alloy cladding or nonmetallic coatings that provide an effective barrier and protect the surface of the steel from hydrogen permeation will prevent cracking.ĭamage Mechanisms Affecting Fixed Equipment in the Refining Industry 5-71_f) Alloy 400 is not susceptible to this form of cracking but may be susceptible to intergranular stress corrosion cracking, particularly in the non-stress relieved condition (see 5.1.1.6).5.1.2.4.7 Inspection and Monitoringa) Surface breaking cracks can be found by WFMT.b) Hardness testing is the best method to determine the susceptibility of suspect material.c) Zones of high hardness can sometimes be found on the process side in weld cover passes and attachment welds that are not tempered (softened) by subsequent passes.5.1.2.4.8 Related MechanismsThis is the same mechanism that is responsible for sulfide stress corrosion cracking in wet H2Senvironments except that HF acid is generating the hydrogen. ![]()
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