

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