Flux

Agglomerated Welding Flux BF 6.30

Flux type: Aluminate-Basic

Classification:
ISO 14174: S A AB 1 66 AC H5 *)
(EN 760: SA AB 1 66 AC H5)

Characteristics

A semi-basic flux for joint welding of high quality steel pipes for pipeline transportation systems in the oil and gas industries. Especially recommended for single and multi-wire (up to 5 wires) submerged arc processes in the two- run technique. Very good weld appearance and slag release providing flat welds with low reinforcement and flat weld interfaces free from undercuts. High grain hardness and resistance to abrasion and a low consumption rate with good flux feeding properties in the transport and recovery system.
As a result of low hydrogen levels (less than 5 ml/100 g in the weld deposits) and oxygen levels of about 350 ppm as well as uniform metallurgical behaviour with low silicon and manganese pick-up, constant mechanical properties are obtained even when welding thick-walled tubes in the two-run technique.

Application

Production of longitudinal and spiral welded steel pipe grades L360 or X52 to L555 or X80 according to ISO 3183 / API Spec. 5L.

Characteristic chemical constituents

SiO2 + TiO2Al2O3 + MnOCaO + MgOCaF2
20 % 35 % 20 % 20 %
Basicity according to Boniszewski: ~1.4

Metallurgical behaviour acc. to ISO 14174 type of current DC

Pick-up Silicon
Pick-up Silicon
Pick-up/Burn-out Manganese
Pick-up/Burn-out Manganese

Flux density: 0.95 kg / dm3 (l)
Grain size acc. to ISO 14174: 2 – 16 (Tyler 10 x 65)
Current-carrying capacity: up to 1.500 A (DC or AC) using one wire

*) Diffusible hydrogen content H5: determined in deposited metal acc. to the method described in ISO 3690
Type of current DC; redrying conditions 200 ± 50°C

 

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