![]() ![]() The hardness test methods were successfully used to identify 14 defective A514 steel plates on the two bridges. ![]() During the testing, two additional cracked splice plates were discovered that contained defective A514 steel. Field hardness testing was conducted over … a 10-week period beginning in October 2008. The plan incorporated the use of the ultrasonic contact impedance and impact hardness test methods. A test plan was developed that incorporated hardness testing to discriminate between acceptable and the defective A514 steels. The I-275 twin bridges contained large quantities of A514 steel that needed testing to identify any remaining defective steel. Consequently, this steel was also susceptible to stress corrosion cracking/hydrogen stress cracking (SCC/HSC). | Hartmann, J.Ībstract: Failure analyses of cracked splice plates made from ASTM A514 quenched and tempered steel revealed that the steel was inadequately tempered, resulting in an excessively hardened, brittle defective steel.
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