ASTM A299 Grade B Boiler and pressure vessel steel plate in 50 mm and below in thickness are normally supplied in the as-rolled state. Plates may be ordered normalized or stress relieved, or both. Plates over 50 mm in thickness shall be normalized.A299 / A299M Covers manganese, silicon carbon steel plates for welding boilers and other pressure vessels, steel grade A299 Class A and A299 Class B.
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