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MMA Electrodes For Mo & CrMo Alloyed Heat & Creep Resisting Steels

mo-crmo-alloyed-steels


This group of electrodes has predetermined levels of Mo and Cr or both to provide weld metals with improved elevated temperature performance over that attainable with straight Carbon Manganese Alloyed steels.

The design features of the electrodes are closely related to those of the group High Tensile and Low Alloy Steels, eg: very low weld metal hydrogen levels and very low levels of non-metallic weld metal inclusions. Within the scope of the specified weld metal analysis, the optimum ratio of weld metal Mn to Si ratio is achieved to guard against solidification cracking.

The hardenability of the higher alloyed types when welding thicker sections dictates that high pre-heat followed by the immediate recommended PWHT should be a mandatory feature of the weld procedure.

Should immediate PWHT not be possible, the component should not be allowed to cool below 150 ºC before PWHT commences. In the case of RD-16B8 which deposits 9Cr-1Mo weld metal welded with a pre-heat of 200 – 350 ºC, an exception should be made, e.g.: after welding allow the weldment to cool gradually to 150 ºC and maintain at this temperature for two hours before PWHT to ensure a fully transformed martensitic microstructure.

TYPE AWS A5.5 DESCRIPTION DATASHEET
RD-716A E7016-A1 Service Temperature up to 450 ºC Download
RD-718A E7018-A1 Service Temperature up to 450 °C Download
RD-16B E8016-B2 Service Temperature up to 550 ºC Download

RD-16BV

E8016-B2 (mod.)

Service Temperature up to 550 ºC

Download
RD-18B E8018-B2 Service Temperature up to 550 ºC Download
RD-96B3 E9016-B3 Service Temperature up to 600 ºC Download
RD-98B3 E9018-B3 Service Temperature up to 600 ºC Download
RD-502 E8016-B6 Service Temperature up to 600 ºC Download
RD-16B8 E8016-B8 Service Temperature up to 600 ºC Download
RD-16B9 E9016-B9 Service Temperature up to 650 ºC Download
RD-18B9 E9018-B9 Service Temperature up to 650 ºC Download
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