Lastek 251 E

Wear at elevated temperatures

Cobalt base hardfacing electrode for abrasion and corrosion resisting surfacings.

Good resistance to high temperatures and to metal to metal friction.

High hardness at elevated temperatures (up to 1000 °C (1830 °F)).

Returns to its original hardness upon cooling.

Resistant to petroleum, plastic, rubber.

Also resistant to food, nitric acid (up to 70% at room temperature), acetic acid, sulphuric acid (up to 60 °C (140 °F) – 10% conc.).

Specifications & Usage


Knives, valve seats, rollers, extrusion screws for the rubber and plastic industry, bearings, …

All components subject to metal to metal friction.

Hardness: 52 - 60 HRC.

Hot hardness: 30 - 40 HRC @ 650 °C (1200 °F).


Remove all rust and dirt.

Sharp edges must be rounded for optimum adhesion.

The arc should be short to avoid too much dilution with the base metal.

On crack sensitive steels, apply a buttering layer with Lastek 9066.


Welding proces: Covered electrode (SMAW)
Material Type: Hard facing
Welding positions: All, except vertical down.
Norm : EN ISO 14700
Classification: E Co3
Norm: AWS A5.13
Classification: E CoCr-C
Minimum packing: 5 kg in a plastic box