BASIC LOW HYDROGEN ELECTRODE FOR WELDING MODIFIED 9Cr-1Mo STEELS OPERATING AT ELEVATED TEMPERATURES UP TO 650ºC
RD-18B9
CLASSIFICATION
AWS A5.5 E9018-B9 | EN ISO 3580-A E CrMo91 B
PRODUCT DESCRIPTION
The chemical nature of the flux together with a significant proportion of iron powder ensures maximum deposition efficiency without detracting from its ability to be used in all positions except vertical down. Overall the arc is very stable, slag detachability is good and metal recovery is some 115% with respect to the core wire.
WELDING FEATURES OF THE ELECTRODE
The design emphasis of the chemically basic flux is engineered to ensure the optimum weld metal properties demanded by the specification are fully met. The basic flux containing the appropriate alloying elements with a controlled balanced addition of iron power, is extruded onto a high purity ferritic core wire with a blend of silicated that ensures both coating strength and a coating resistant to subsequent moisture absorption.
APPLICATIONS AND MATERIALS TO BE WELDED
PLATE ASTM A387 Grade 91, TUBES/PIPES ASTM A335 Grade 91, A234 Grade WP91, A199 Grade T91, A213 Grade T91. BS 3604 Grades CFS & HFS 629-470 CFS/HFS 629-590. FORGINGS A182 Grade F91, A336 Grade F91 CAST ASTM A217 Grade C12A, BS1503 Grade 91 PWHT recommended range is 745 - 775ºC (2 hours), pre-heat 200 - 300ºC. Cool to 150ºC before PWHT.
WELDING AMPERAGE AC and DC
OTHER DATA
Electrodes that have become damp should be re-dried at 150oC for 1 hour
