90 HRB
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It is an ASME Standard for Carbon stell forgings, rounds
REQUIRED EQUIVALENT GRADE FOR THIS GRADE sa 516 gr 70 .
ASME spec for carbon steel weld caps compatible with SA106B pipe etc
SA 214 Covers electric - resistance welded carbon steel tubes to be used for heat exchangers, Condensers, and similar heat transfer apparatus. The tubing sizes usually furnished to this specification are to3 in. O.D. inclusive. SA-179 Covers electric resistance welded tubesmade of carbon steel and intended for use as boiler tubes, boiler flues, superheater flues, and safe ends. The tubing sizes and thicknesses usuallyfurnished to this specification are ½ in. to 5.in. O.D. and 0.035 in. to 0.320 in. inclusive in minimum wall thickness.
GR SA 106 Gr B is used for high temperature service and might not require impact test