Page 2 - SD 2205

Impact strength (KV minimum values)

Temp. -50°C -20°C +20°C -60°F 0°F +70°F
Single 75 J 90 J 120 J 54 ft.lbs 65 ft.lbs 87 ft.lbs
Average(5) 90 J 120 J 150 J 65 ft.lbs 87 ft.lbs 109 ft.lbs

Hardness values - Typical values

Average (5) HV 10 210-260 HB : 210-240 HRC : 15-20

PHYSICAL Density : 7,800 kg/m
3
PROPERTIES Young Shear
Thermal
Interval Thermal °C Resistivity conductivity Specific modulus modulus
Temper expansion
heat
E
G
-1
-1
-1
-6
-1
°C ax10 K 20 (µ cm) (W.m .K ) (J.kg-1.K ) (GPa) (GPa)
450
80
75
17
200
20-100 13.5 100 86 18 450 190 73
92
14
20-200 14.5 200 100 19 500 180 70
300
20
170
67
550
20-300
3
Density : 0.282 Lb/in
Shear
Young
Interval Thermal °F Resistivity Thermal Specific modulus modulus
heat
G
E
Temper expansion (µ .in) conductivity (Btu/lb°F10 ) (psi 10 ) (psi 10 )
6
6
6
-6
(Btu/hr ft °F)
ax10 °F
°F
70-210 7 212 31.5 11.5 0.11 29 10.9
68
11
28
0.12
33.8
10.5
70-400 7.5 392 36.2 12 0.12 27 10.1
70-600 8 572 39.3 12.5 0.13 26 9.7

STRUCTURE SD 2205 is a duplex stainless steel ; its chemical composition is optimized in order
to present, after a solution annealing treatment at 1040-1080°C (1900- 1975°F)
followed by water quenching, a nearly 50%  /50%  microstructure.

Heat treatments performed at 1100°C ( 2010°F) and higher may result in an
increase of the ferrite content.

Typical TTP-diagram (temperature time precipitation) shows the two-phase
transformation areas. At high temperature : 1000°-600° C ( 1830-1110°F), the 
phase may transform in , ,... intermetallic phases which makes the alloy brittle.
At lower temperature (500-300°C - 930-570°F) the  phase transforms in '
resulting in a hardening of the structure after several hours holding time.