Page 5 - SD 2507

Time to failure, h Time to failure, h
600 600

SD 2507
500 SD 2507 500
AISI (720 h)
400 316L 400

UR 45N
300 300
UR 45N
200 200

100 100

0
0.2 0.4 0.6 0.8 1.0 0.4 0.5 0.6 0.7 0.8 9.0
Stress - Tensile strength Stress - Tensile strength

Constant-load SCC tests in NACE-solution at room
Results of SCC tests with constant load in 40%
CaCl 2, pH=1,5, at 100°C (210°F) with aerated test temperature (NACE TM-01-77)
solution.

FABRICATION Cold forming

Due to its higher mechanical properties the cold forming of SD 2507 grade
requires, for cold forming, more strength than austenitic grades. For cold
deformations higher than 20 %, an intermediate heat treatment is required
(solution annealing 1080/1120°C ( 1976/2018°F) + water cooling).

Detailed guidelines for cold forming of unwelded and welded plates are available
upon request.

Hot forming

Between 1150°C and 1000°C ( 2102 and 1832°F). After hot forming, a new solution
annealing heat treatment in the range 1080/1120°C ( 1976/2018°F) + water cooling
is necessary.

Pickling

Same conditions as for 316L grade, but the pickling time is at least twice that of
316L grade. An increase of the temperature of the pickling bath is recommended.

WELDABILITY SD 2507 can be welded using the following processes : SMAW, GTAW (with
filler), GMAW, PAW (with filler).

The welding procedure are similar to those of other duplex stainless steels
- no pre-heating,
- heat input between 0.5 kJ/mm and 2 JK/mm is generally recommended for
hot rolled plates (depending on the process and on the thickness of the
plate). Precise welding parameters for each welding process and
thicknesses are available on request.
- interpass temperature less than 150°C ( 302°F) and preferably less than
120°C (248°F)
- no PWHT, except solution annnealing at 1080/1120°C ( 1976/2048°F) +
water cooling.

As in welded conditions, the ferrite ratio in the heat affected zone should be lower
than 70% and beween 20 to 60% for the weld metal or even better 20 to 40% ; for
SMAW, and SAW weld metal aim for the lower part of the range (20 to 40%)
In order to control the structure and properties, over alloyed filler materials are
recommended (nickel and/or nitrogen additions). Excessive dilutions must be
avoided.