UTP CELSIT 721 anti-wear & anti-corrosion
Classifications rutile coated stick electrode on Cobalt base, core wire alloyed
DIN 8555 EN 14700 AWS A5.13
E 20-UM-350-CTZ E Co1 E CoCr-E
Characteristics and field of use
UTP CELSIT 721 is used for crack resistant hardfacing on parts subject to a combination of
impact, pressure, abrasion, corrosion and high temperatures up to 900 °C, such as running
and sealing faces on gas, water, steam and acid fittings and pumps, valve seats and cones
for combustion engines, working parts in gas and power plants, hot working tools with
changing thermal load.
Excellent gliding characteristics, good polishability and toughness, highly workhardening,
nonmagnetic, machinable with cutting tools.
UTP CELSIT 721 has excellent welding properties and a homogenenous, finely rippled seam
due to spray arc. Very easy slag removal.
Hardness of the pure weld metal 31 – 37 HRC
workhardened approx. 245 HRC
Hardness at 600 °C approx. 240 HB
Typical analysis in %
C Cr Mo Ni Co
0,3 31,0 5,0 3,5 balance
Welding instruction
Clean welding area, preheating temperature 150 – 400 °C, depending on the size of the
workpiece and the base material. Slow cooling. Hold stick electrode vertically and with a
short arc and lowest possible amperage. Re-dry stick electrodes that have become damp
for 2 hours at 300 °C.
Welding positions
Current type DC (+) / AC
Form of delivery and recommended welding parameters
Electrodes Ø mm x L 3,2 x 350 4,0 x 350
Amperage 80 – 120 110 – 140