Füllrohr DURA OKs 448 Fe

Standards DIN8555 E21-GF--45-GP


DURA OKs 448 Fe is a steel tube filled with fused tungsten carbides
for the oxyacetylene welding process.
The weld metal consists in a tungsten-steel-matrix with embedded tungsten carbides. The extraordinary hardness of the fused tungsten carbides (WSC) of approx. 2200 - 2600 HV 0.4 imply the high build-up wear resistance.
The carbon content of the base metal should not exceed 0,45 % in order
to avoid lack of fusion. However, the base material should have enough
strength to avoid the penetration of the build-up in the base material.

Typical applications It is to expect on-armour-platings of tools and machine parts in the mining, road construction, well digging, special civil engineering, depression drilling technology, where strongest abrasion by minerals may occur.

for best welding

To get a good result the welding areas should be properly cleaned of rust, grease, tinder and similar pollutions. The burner nozzle should be held at a shallow angle to the work area with a neutral to slightly acetylene excess flame. To avoid overheating, the work area should be slightly wetted and the tube metal should not come into contact with the centre of the flame.
Depending on base material and size of the work piece preheating to 400- 600°C (660-930°F) is recommended.
The selection of the grain size und the rod diameter depend on the application and the size of the tool to be hard faced.
Lower particle sizes are recommended when the wear from abrasion is
dominant, bigger sizes for fitting a tool for stronger cutting strength.

Mechanical properties
of all-weld metal

( typical values )

Hardness of fused tungsten carbide
(HV 0.4)
2200 – 2600

Hardness of matrix alloy HRc
ca. 56 - 60

Weld metal analysis (typical, wt. %)

ca. 40

ca. 60

Dia./Length mm

3.5 x 350/700
4.0 x 350/700
5.0 x 350/700
6.0 x 350/700

Grain size mm

0.5, 1.0, 1.2
0.5, 1.0, 1.2
0.5, 1.0, 1.2, 1.6
0.5, 1.0, 1.2, 1.6, 2.0



  This product will also produce with spherical WSC.

Statements on composition and application are just for the applier.s information. Statements on mechanical properties always refer to the all-weld-metal according to valid standards. DURAWELD may change the characteristics of its products without notice. We recommend the applier to check our products for their special application autonomously.