GB EZCQ Z238 cast iron electrode

GB EZCQ Z238 cast iron electrode

Z238
GB：EZCQ
AWS：
Current：Used for repair welding on spheroidal graphite cast iron pieces.

Z238

According with GB EZCQ


Introduction: Z238 is a kind of spheroidal graphite cast iron electrode with low-carbon steel core wire and strong graphitization type coating. Due to a certain quantity of spheroidal graphite agent added, the graphite in the deposited metal will appear as spherical precipitation when cooled. AC/DC.


Uses: Used for repair welding on spheroidal graphite cast iron pieces.


Chemical Composition of Deposited Metal (%)
Chemical Composition
C
Mn
Si
S
P
Fe
Total Quantity of Other Elements
Nodularizer
Guarantee Value
3.20~4.20
≤0.80
3.20~4.00
≤0.100
≤0.150
Balance
≤0.100
0.04~0.15

Reference Current (AC, DC+)
Electrode Diameter(mm)
φ3.2
φ4.0
φ5.0
Welding Current (A)
80~120
130~170
160~190

Instructions:
1.The electrodes must be baked under about 250℃ for an hour before welding.
2.The weldments should be preheated to about 500℃ before welding and given insulation work and slow cooling after welding so that the repaired places may be able to be given machine work.
3.Criteria for heat treatment
Normalizing treatment: given insulation work under 900-920℃ for 2.5 hours, given furnace cooling to 730-750℃, given insulation work for 2 hours, taken out and given air cooling.
Annealing treatment: given insulation work under 900-920℃ for 2.5 hours and given furnace cooling to below 100℃.

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