Classification:
AWS A5.4
EN ISO 3581-A
E2594-15
E 25 9 4 N L B 12
Description:
Cromarod 2507B is a basic flux coated electrode which deposits a
25%Cr / 9.0%Ni / 4.0%Mo / 0.25%N super dupex type stainless steel weld with a ferrite content of
approximately FN 40. It is designed to give very good fracture toughness at temperatures down to -40
°C. The electrode is intended for welding similar composition steels e.g. SAF 2507, Uranus 52N,
Zeron 100, which offer even higher strength and corrosion resistance levels than the ordinary duplex
grades. A heat input range of 0.4-1.5 KJ/mm is recommended to maintain a favourable phase
balance in the weld metal and avoid unfavourable precipitation effects in the plate. Applications
include offshore platform pipework for seawater cooling systems and firefighting water, as well as
pumps, valves and risers.
Coating type:
Basic
Mechanical properties
Welding positions:
Yield strength, Rp0.2%:
Tensile Strength, Rm:
Elongation, A5
Impact energy, CV:
Typical
Welding current:
DC+
Redrying temperature:
350 °C, 2h
750 MPa
900 MPa
24%
-40 °C • 55 J
Ferrite content:
FN 50-55 (WRC -92)
Chemical composition, wt.%
Corrosion resistance
Very good resistance to pitting corrosion and
stress corrosion cracking in chloride and H2S
environments. Good resistance to intergranular
corrosion. Pitting resistance equivalent, PRE = 41.
Critical pitting temperature CPT = 40°C (ASTM
G48).
Scaling temperature:
Approx. 850°C in air.
Approvals:
CE
Product data
2,5
300
74572500
60-90
23
0,71
79
1,0
3,2
350
74573200
80-120
24
0,71
41
1,4
4,0
350
74574000
130-170
26
0,73
26
2,0
82