253MA

CHARACTERISTICS 

AVESTA 253 MA is designed for welding the Outokumpu high temperature steel 253 MA. The steel as well as the consumable provides excellent properties at temperatures 1562-2012°F (850-1100°C). The resistance to carbon and nitrogen pick up at elevated temperatures is good. This is achieved, among other things, by alloying with Si and rare earth metals (REM). AVESTA 253 MA can also be used for welding the somewhat lower alloyed Outokumpu 153 MA.  The composition of the consumable is balanced to ensure a crack resistant weld metal with a ferrite content of 3-10%.

Chemical composition (nominal) %

WELDING DIRECTIONS 

MIG welding of 253 MA is best performed using spray arc or pulsed arc. The weldability using short arc is somewhat limited and the welding of thin gauges <0.12” (<3 mm) and in?position is best performed using pulsed arc.

253 MA has a tendency of getting a thick oxide layer during hot rolling and welding. Black plates as well as previous weld beads should be carefully brushed or ground prior to welding.

The joint should be prepared with a sufficient root gap to ensure full penetration.  

Ar + 30% He or  Ar + 30% He + 2.5% CO2.

The helium addition improves the fluidity and gives a slightly wider penetration. Helium increases the energy in the arc and the heat should therefore be kept at a lower level than when welding without helium to compensate for the higher temperature in the arc. Addition of helium will increase the blackening slightly.

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