SPECIFICATIONS: GRADE Lean Duplex | UNS S32304 | ASTM/ASME A240 | Werkstoff 1.4362
Lean duplex 2304 is a 23‰ Cr, 4‰ Nickel, Mo free duplex stainless steel (23.04). We hold stock of duplex alloys in plate, sheet, and bar from our warehouse in the CN. We often meet specialist alloy profiling requirements and are a global supplier.
The alloy lean duplex 2304 has similar corrosion resistance properties to 316L. Furthermore, its mechanical properties i.e. yield strength, are twice those of 304/316 austenitic grades. This allows the designer to save weight, particularly for properly designed pressure vessel applications.
The alloy is particularly suitable for applications covering the -50°C/+300°C (-58°F/572°F) temperature range. Lower temperatures may also be considered, but need some restrictions, particularly for welded structures.
With its duplex microstructure, low nickel and high chromium contents, the alloy has improved stress corrosion resistance properties compared to 304 and 316 austenitic grades.
| Typical values (weight %) | |||||
|---|---|---|---|---|---|
| C | Cr | Ni | Mo | N | Others |
| 0.020 | 23 | 4 | 0.2 | 0.1 | S = 0.001 |
| PREN (‰Cr+3.3‰Mo+16‰N) ≥ 24 | |||||
| Tensile properties (minimum values) | ||||||||
|---|---|---|---|---|---|---|---|---|
| °C | Rp 0.2 MPa | Rp 1.0 MPa | Rm MPa | °F | YS 0.2‰ KSI | YS 1.0‰ KSI | UTS KSI | Elongation ‰ |
| 20 | 400 | 440 | 600 | 68 | 58 | 64 | 87 | 25 |
| 100 | 330 | 365 | 570 | 212 | 48 | 53 | 83 | 25 |
| 200 | 280 | 310 | 530 | 392 | 41 | 45 | 77 | 20 |
| 30 | 230 | 260 | 490 | 572 | 33 | 38 | 71 | 20 |
Values obtained for hot rolled plates (th ≤ 50mm). Lean duplex 2304 grade must not be used for a long time at temperatures higher than 300°C &40;572°F), where precipitation hardening phenomenon occurs.
| Hardness 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 values (KCV minimum values) | |||
|---|---|---|---|
| Average (5) | HV10 180-230 | HB : 180-230 | HRC ≤ 20 |
Copper additions may be considered as lean duplex 2304 Cu may be hardened by heat treatment to improve abrasion-corrosion resistance properties.
| Density: 7,800 kg/ – 0.28 lb/in3 | ||||||||
|---|---|---|---|---|---|---|---|---|
| Interval temper °C | Thermal expansion αx10-6K-1 | °C | Resistivity (µΩ cm) | Thermal conductivity (W.m-1.K-1) | Specific heat (J.kg-1.K-1) | Young modulus E (GPa) | Shear modulus G (GPa) | |
| 20-100 | 13 | 20 | 80 | 17 | 450 | 200 | 75 | |
| 100 | 92 | 18 | 500 | 190 | 73 | |||
| 20-200 | 13.5 | 200 | 100 | 19 | 530 | 160 | 70 | |
| 20-300 | 14 | 300 | 105 | 20 | 560 | 170 | 67 | |
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