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 ° Cromarod 308H is recommended because of
C,
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 ° • 70 J
C
Ferrite content:
5
Redrying temperature:
350 ° 2h
C,
Corrosion resistance
Good resistance to general and intergranular
corrosion particularly at
elevated temperatures.
Chemical composition, wt.%
Scaling temperature:
Approx. 850 ° in air.
C
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