We Require A179 U Tube set, where we have specified that Hardness test to be done on the shortest U Bends after Stress Relieving. The Hardness Values obtained are 78 & 74 HRB respectively, noting that the Max Hardness value as per ASTM A179 tubes are 72HRB (nothing Mentioned about U bends)
Can anyone advice on the above and specify any supporting standard/document for reference. Can we accept the obtained hardness of 78 & 74 HRB
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