Page 2 - SD 2304

Toughness values (KCV minimum values )

Temp. -50°C +20°C -60°F +70°F
Single 75 J/cm² 90 J/cm² 54 ft.lbs 65 ft.lbs
Average(5) 90 J/cm² 150 J/cm² 65 ft.lbs 87 ft.lbs

Hardness (Typical values)

Average (5) HV 10 180-230 HB : 180-230 HRC  20

Copper additions may be considered as SD 2304 Cu may be hardenned by heat
treatment to improve abrasion-corrosion resistance properties.

PHYSICAL Density : 7,800 kg/m - 0.28 lb/in
3
3
PROPERTIES Young Shear
Thermal
Thermal
Interval expansion °C Resistivity conductivity Specific modulus modulus
Temper
heat
E
G
-1
-6
-1
-1
- 1
-1
°C ax10 K 20 (µ cm) (W.m .K ) (J.kg .K ) (GPa) (GPa)
200
17
450
80
75
20-100 13 100 92 18 500 190 73
20-200 13.5 200 100 19 530 180 70
20-300
67
105
20
560
300
170
14

STRUCTURE The chemical analysis of SD 2304 is optimised to obtain a typical 50  / 50 
microstructure after solution annealing treatment at 950°/1050°C (1742/1922°F).
The microstructure of SD 2304 duplex is very stable compared to molybdenum
containing duplex stainless steels. Intermetallic phases (, ) are present only
after 10 hours holding time in the 750°/850°C ( 1382°/1562°F) temperature range.
Copper additions to SD 2304 grade, when specified, increase the hardness of the
steel after heat treatment in the 350/500°C (662/932°F) temperature range.
CORROSION General corrosion
RESISTANCE
304 316L SD 2304
mm/year
2
FORM IC ACID
BOILING TEM PERATURE
UR 1,5

ACETIC 50%
1 ACETIC ACID 100% + FORM IC 50%ACIDS

0,5 BOILING TEM PER. BOILING TEM PER.

Corrosion resistance to stagnant sulfuric Corrosion resistance in different organic acid
acid (0,3 mm/year)
Because of its high chromium content (23%) the corrosion resistance
properties of SD 2304 are almost equivalent to those of 316L.

Localised corrosion resistance
The 23% chromium and 0.1N% additions explain why SD 2304 duplex stainless
steel behaves much better than 316L grade when considering pitting and crevice
corrosion resistance.