OK 84.52 SMAW
Type Rutile-basic E6-UM-55-GR
Description
A general-purpose, hardfacing electrode depositing
a corrosion-resistant fully martensitic steel.
The electrode is suitable for hardfacing shafts,
racks and pinions, links and pins, valve seats of
cast steel, mixer arms, feed gear, knives, loading
buckets and track rollers.
Generally, a preheat and interpass temperature
of about 200°C is recommended for most applications.
Welding current
AC, DC+ OCV 70 V
12346
Classifications
DIN 8555 E6-UM-55-GR
Typical all weld metal composition,

C Si Mn Cr
0.25 0.5 <0.5 13.0
Typical mech. properties all weld metal
Weld metal hardness, a w 49-55 HRC
(deposited on mild steel, no preheat,
interpass temperature 250°C)
1st layer 43- 49 HRC
2nd layer 46-52 HRC
3rd layer 49-55 HRC
Machinability Grinding only
Abrasion resistance Very good
High temp. wear resistance Very good
Corrosion resistance Very good
Tempering resistance
Temp°C/1h HRC
100 52
200 50
300 50
400 52
500 55
600 47
700 35
Annealing and hardening of weld metal:
Soft annealing: 780-800°C
Rehardening procedure:
Hardening temperature, C: 950- 1000
Quenching medium: compressed air or oil
Deposition data at max current
Diameter,
mm
Length,
mm
Welding
current, A
Arc voltage,
V
N.
Kg weld
metal/kg
electrodes
B.
No. of electrodes/
kg
weld metal
H.
Kg weld
metal/hour
arc time
T.
Burn-off
time, s/
electrode
2.5 350 70-110 22 0.55 80.0 0.9 48
3.2 450 100-160 24 0.58 35.0 1.4 70
4.0 450 140-220 25 0.58 23.0 2.0 80
5.0 450 220-310 31 0.60 14.5 3.0 80