

Classification:

AWS A5.4

EN ISO 3581-A

E347-15

E 19 9 Nb B 42

Description:

Cromarod B347 is a niobium stabilised, basic flux coated electrode used

for welding the Nb or Ti stabilised 18% Cr/ 10% Ni austenitic stainless

steel grades 347 and 321. It is also suitable for the unstabilised grades

304 and 304L. Cromarod B347 is primarily intended for use where resistance to intergranular

corrosion is required. For welding the controlled carbon material grades 321H and 347H, used for

structural applications at temperatures above 400 °C, Cromarod 308H is recommended because of

its superior creep strength.

Cromarod B347 has an easy slag removal even in narrow joint preparations, reducing post-weld

cleaning time. The basic coating results in higher resistance to porosity due to improved gas shield,

making the electrode highly suitable for on site welding. Basic coated stainless electrodes produces

weld metal with higher touhgness at lower temperatures compared to rutile coated electrodes due to

less weld metal oxygen. The basic coating results in a lower weld metal Si content making B347 less

sensitive to hot cracking caused by Nb additions, compared to rutile types. Furthermore this permits a

lower weld metal ferrite content compared to rutile types.

Applications:

pipe welding, restrained joints, cladding

'

Coating type:

Basic

Mechanical properties

Metal recovery:

110%

Yield strength, Rp0.2%:

Tensile Strength, Rm:

Elongation, A5

Impact energy, CV:

Typical

Welding positions:



Welding current:

DC+

500 MPa

620 MPa

37%

-50 °C • 70 J

Ferrite content:

5

Redrying temperature:

350 °C, 2h

Corrosion resistance

Good resistance to general and intergranular

corrosion particularly at

elevated temperatures.

Chemical composition, wt.%

























Scaling temperature:

Approx. 850 °C in air.

Approvals:

CE

Product data

  





















2,5

300

74612500

50-80

24

0,69

86

0,83

3,2

350

74613200

75-125

25

0,69

43

1,24

4,0

350

74614000

100-165

26

0,69

28

1,94

4,0

450

74614045

100-150

26

0,69

22

1,94

5,0

450

74615000

150-210

28

0,68

15

2,82

61