Meaning 22 RC
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22 RCSee all hardness related definitions 22 RC, 99 RB, 237 HBW (read 235 in table), and 248 HV represent the important upper hardness limit for non austenitic steel for H2S service specified in NACE MRO175 and referenced in API Spec 6A. Some authorities may offer slightly different equivalent hardness numbers.
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