Description & applications

Specially designed for welding austenitic stainless steels WP 380 is also suitable for welding both low-alloy steels for use at elevated temperatures as well as the combination with austenitic stainless steels. As a result of the semi-basic flux characteristics crackfree welds are obtained for most grades of stainless steels welded with the corresponding wire electrodes. The metallurgical behaviour of the flux is neutral (C-neutral, low Si pick-up and low Mn burn-out) without Cr compensation. It is suitable for welding on DC and AC using single or multi-wire processes and produces smooth weld beads free of slag residuals with flat weld interfaces even in narrow gaps and on preheated work pieces.


EN 760 (stainless steels) EN 760 (low alloy steels)
SF CS 2 DC SF CS 1 63 DC

Typical weld metal composition (%)

SiO2 Al2O3 CaO+MgO CaF2
30 5 35 20


20 kg PE-bags

Application Instructions

Joint welding and surfacing of:

-creep-resistant CrMo-steels such as 12CrMo19-5 / A355 Gr. P22-P5 or X20CrMoWV12-1 / A351 for boiler, vessel and pipe fabrication.

-martensitic and ferritic Cr(NiMo)-steels acc. to EN 10088 with the appropriate wire electrodes in conjunction with the corresponding heat treatments.

-austenitic CrNi(Mo)-steels (including ELC-grades) acc. to EN 10088 ; resistant against intergranular corrosion in both the as-welded and solution-treated condition

-high-alloy CrNi(Mo)-steels for use at low temperatures and heat-resistant steels

-high-alloy Cr(NiMo)-steels in combination with low-alloy steels (dissimilar joints)

-nickel-base alloys using NiCr- and NiCrMo- wire electrodes acc. to AWS A5.14 / EN ISO 18274

WP 380 is also suitable for welding 9% Ni-steels in combination with appropriate wire electrodes such as ERNiCrMo-3 (Type 625) and ERNiCrMo-4 (Type 276)

Metallurgical Behaviour

Flux Type


Flux Density

1.5 kg / dm³

Grain Size

1-16; Tyler 10 x 150

Current-Carrying Capacity

900 A DC using one wire

Storage and redrying

The flux can be stored up to 5 years after delivery in dry storage rooms. Flux that has picked up moisture has to be redried at 150 to 250°C effective flux temperature. Usually, if austenitic stainless steels are to be welded flux redrying can be neglected.

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