HFK 630B-O is a chromium-molybdenum-boron high-chromium cast iron surfacing welding wire. It is suitable for the welding of workpiece surfaces that require strong wear resistance. The appearance of this wire’s weld beads is beautiful, welding the wire does not result in slag, and the wire’s single-layer hardness after welding is ≥60 HRC. Though shielding gas is not mandatory, CO2 should be used for best results.

Typical applications

Used for surfacing in situations which normal and high temperature abrasion and corrosion resistance are needed. Example applications include turbine blades and blast furnace clocks.

Chemical composition of deposited metal (%)


Mechanical properties

LayersHardness (HRC)
Second Layer60–62

Recommended welding parameters

DC reverse connection

Diameter: in (mm)Current (A)Voltage (V)
0.045 (1.2)160–22022–25
116 (1.6)200–28022–28
Shielding gasGas flow: cfh (l/min)Torch angleStick out: in (mm)
100% CO240 (20)80°1234 (15–20)

Diameters and packaging

Diameter: in (mm)Packaging: lb (kg)
0.045 (1.2)33 (15)
116 (1.6)33 (15)
Click here to download the datasheet for Kooben HFK 630B-O.