OK 85.58 SMAW
Type Lime-basic E3-UM-50-ST
Description
OK 85.58 is a hardfacing electrode for the repair
welding of hot-working tools, hot trimming tools,
punches and so on. The weld metal hardness
can be increased by hardening and tempering, or
by tempering alone. The weld metal can be step
hardened. To avoid cracking, the preheat and
interpass temperature should be at least 300°C
and preferably 500°C.
Welding current
AC, DC+ OCV 70 V
12346
Classifications
DIN 8555 E3-UM-50-ST
Typical all weld metal composition,

C Si Mn Cr W Co Nb
0.32 1.1 1.0 1.8 8.0 2.0 0.8
Typical mech. properties all weld metal
Weld metal hardness, a w 42-50 HRC
(deposited on mild steel)
Preheat and interpass temperature 350°C:
1st layer: 47- 52 HRC
2nd layer: 47- 52 HRC
3rd layer: 47- 52 HRC
Machinability Grinding only
Abrasion resistance Good
High temp. wear resistance Very good
Tempering resistance
Temp°C HRC(1h)
100 51
200 51
300 52
400 53
500 53
550 55
600 53
650 45
700 35
Annealing and hardening:
Soft annealing °C: 850
Cooling:
10C/h down to 650°C, then cooling in air
Hardening Temperature, °C: 1100-1150
Quenching: In 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 0.65 72.0 0.9 53
3.2 350 100-150 23 0.63 45.0 1.3 62
4.0 350 130-190 23 0.63 29.5 1.7 75
5.0 350 180-250 25 0.66 18.0 2.2 88