Page 2 - SD 2507Cu

Impact strength (KV typical values)

-50°C -20°C 0°C 20°C
(-58°F) (-4°F) (32°F) (68°F)
KV plates (guaranteed) > 70 J > 85 J > 90 J > 95 J
KV weld metal (typical) > 30 J > 40 J > 50 J > 55 J

Impact values of welds are closely related to the microstructure ( /  balance) and
the control of chemical analysis (oxygen, nitrogen, nickel) which depend on
welding processes and parameters. The best results are obtained for high
austenite contents (75-60 %) and low oxygen levels. High nitrogen contents
associated with high ferrite levels must be avoided. For more information, please
contact us.

Hardness values - Typical values

HV 5 : 250 to 280 HRC < 28

PHYSICAL Density : 7,820 kg/m - 0.28 lb/in
3
3
PROPERTIES
Young
Shear
Interval Thermal °C °F Resistivity Thermal Specific modulus modulus
heat
Temper expansion (µ cm) conductivity (J.kg-1.K ) (GPa) (GPa)
G
E
-1
-6
-1
-1
-1
°C
(W.m .K )
x10 K
20-200 13.5 20 68 85 17 450 200 75
95
14
20-300 14.5 100 392 100 18 500 190 73
392
200
180
20-500
530
19
70

25 Cr super duplex grades are subject to intermetallic phase precipitations ( , ...)
STRUCTURE particularly when improperly heat treated. Higher molybdenum and tungsten
additions increase the sensitivity to sigma phase transformation. CLI equipments
STABILITY and heat treatments are optimised in order to control the composition, structure
and properties of the products. We use a batch furnace to control time and
temperature for each individual plate. This makes CLI duplex quality. The
microstructure free of intermetallic phases contributes to an increase of both
toughness properties and corrosion resistance properties.

Nitrogen additions have been increased compared to the former SD 2507Cu grade
(0.180.25%) in order to increase both corrosion resistance properties and
structure stability, particularly in HAZ.

UR 35 N UR 45 N UR 52N UR 52N + Mo, W, Si
UR 47N + UNS S32760 DTS 25 NWCu 1000°C •  phase • M7 C3 carbide, Cr N nitride HAZ
1800°F
° C ° F Cr • Cr 2 N nitride
Mo  phase
1000 1830 W •  2 phase
Si •
800 1470 • M 23 C 6 carbide
600 1110 • R Phase
•  phase
400 750 •  phase (Cu)
200 390 Cr, Mo, Cu, W • ' phase
• G. phase...
time 300°C
10 100 1000 10000 (sec.) 600°F
Cr, Mo, Cu, W Time
0.1 1 10 100 hour
Possible precipitations in super duplex stainless steels