Introduction: D256 is a kind of high-manganese steel surfacing electrode with low-hydrogen potassium type coating. AC/DC (the open circuit voltage should be higher than 70V when using AC). In surfacing welding, weak current and stringer bead should be used, and it should be hammered or given water quenching immediately when it turns red to decrease crack tendency. The surfacing metal is austenitic high-manganese steel. It can be given work hardening, and it has toughness and wear-resistance.

Uses: Used for surfacing welding on parts of all kinds of crushers, high-manganese steel rails, buckets, bulldozers, etc., which may easily be worn out due to impact.

Chemical Composition of Deposited Metal (%)

Chemical Composition	C	Mn	Si	Mo	Total Quantity of Other Elements
Guarantee Value	≤1.10	11.0~16.0	≤1.30	—	≤5.00

Hardness of Surfacing Layer: HB≥170

Reference Current (AC, DC+)

Electrode Diameter(mm)	φ3.2	φ4.0	φ5.0
Welding Current (A)	70~90	100~140	150~180

Instructions:
1.The electrodes must be baked under 300-350°C for an hour before welding.
2.For surfacing welding on worn-out high-manganese steel work pieces, in advance, the worn-out parts should be cleared away, or given water toughening, or given backing weld with Cr-Mn steel electrodes (such as D277).
3.There is thick smoke in surfacing welding, so please keep ventilated and stand windward to operate.