Sandvik SAF 2304®
Sandvik SAF 2304® introduction
Sandvik SAF 2304® is a lean duplex (austenitic-ferritic) stainless steel characterized by the following properties:
Very good resistance to stress corrosion cracking (SCC)
Good resistance to general corrosion and pitting
High strength - approximately twice the proof strength of austenitic stainless steels
Physical properties that offer design advantages
Ease of fabrication and good toughness
Good weldability
More technical information and charts that are relevant to the materials corrosion, mechanical and physical performance are displayed in the figures on the right side of the material page.
Datasheet URL:
Sandvik SAF 2304®
Datasheet updated 2019-12-20 09:50 (supersedes all previous editions)
Equivalent material: UNS S32304, EN 1.4362, DIN 1.4362, EN X2CrNiN23-4, DIN X2CrNiN23-4, SS 2327, AFNOR Z2CN23-04AZ
Sandvik SAF 2304® general
| Property | Temperature | Value | Comment |
|---|---|---|---|
| Density | 23.0 °C | Density of 7.8 g/cm³ | - |
| Recycled Content | - | Recycled Content of 82.1 % | Average recycled content |
Sandvik SAF 2304® thermal
| Property | Temperature | Value | Comment |
|---|---|---|---|
| Coefficient of thermal expansion | 100.0 °C | Coefficient of thermal expansion of 1.35E-5 1/K | for 30°C to the mentioned temperature |
| - | 200.0 °C | Coefficient of thermal expansion of 1.4E-5 1/K | for 30°C to the mentioned temperature |
| - | 300.0 °C | Coefficient of thermal expansion of 1.45E-5 1/K | for 30°C to the mentioned temperature |
| - | 400.0 °C | Coefficient of thermal expansion of 1.45E-5 1/K | for 30°C to the mentioned temperature |
| Specific heat capacity | 20.0 °C | Specific heat capacity of 490 J/(kg·K) | - |
| - | 100.0 °C | Specific heat capacity of 505 J/(kg·K) | - |
| - | 200.0 °C | Specific heat capacity of 530 J/(kg·K) | - |
| - | 300.0 °C | Specific heat capacity of 550 J/(kg·K) | - |
| - | 400.0 °C | Specific heat capacity of 590 J/(kg·K) | - |
| Thermal conductivity | 20.0 °C | Thermal conductivity of 16 W/(m·K) | - |
| - | 100.0 °C | Thermal conductivity of 17 W/(m·K) | - |
| - | 200.0 °C | Thermal conductivity of 18 W/(m·K) | - |
| - | 300.0 °C | Thermal conductivity of 19 W/(m·K) | - |
| - | 400.0 °C | Thermal conductivity of 21 W/(m·K) | - |
Sandvik SAF 2304® chemical
| Property | Value | Comment |
|---|---|---|
| Carbon | Carbon of 0.03 % | max. |
| Chromium | Chromium of 22.5 % | - |
| Copper | Copper of 0.3 % | - |
| Iron | - | |
| Manganese | Manganese of 2 % | max. |
| Molybdenum | Molybdenum of 0.3 % | - |
| Nickel | Nickel of 4.5 % | - |
| Nitrogen | Nitrogen of 0.1 % | - |
| Phosphorus | Phosphorus of 0.04 % | max. |
| Silicon | Silicon of 1 % | max. |
| Sulfur | Sulfur of 0.015 % | max. |
Sandvik SAF 2304® magnetic
| Property | - | - | ||
|---|---|---|---|---|
| Application areas | Industry | Applications | Used today | Advantages of Sandvik SAF 2304 |
| Process industry | Heat exchangers and piping where chlorides are present | ASTM 304/304L ASTM 316/316L |
Higher resistance to SCC | |
| - | Instrumentation tubing, steam tracing | ASTM 304/304L AISI 316/316L |
Higher resistance to SCC | |
| Petrochemical industry | Tubular reactors for high temperatures where carbon steel is used for the shell | ASTM 304/304L ASTM 316/316L |
Coefficient of thermal expansion comparable to that of carbon steel | |
| Pulp & paper | Digester preheater Evaporators |
ASTM 304/304L ASTM 316/316L |
Higher resistance to SCC Higher resistance to SCC |
|
| Nuclear power | Reheaters | Carbon steels ASTM 430 ASTM 304/304L |
Ease of fabrication, good corrosion resistance | |
| Power | Feed water heaters | ASTM 430 ASTM 304/304L |
High resistance to SCC, high strength and ease of fabrication | |
| Engineering | Beams and torque transmitting shafts | Carbon steels ASTM 304/304L ASTM 316/316L |
High strength combined with excellent corrosion resistance, ease of fabrication and low cost | |
| Hydraulic system | Hydraulic tubing | Carbon steels | Excellent resistance to corrosion Reduced installation cost owing to easy cleaning |
|
| Oil and gas | Coolers on- and offshore. Piping systems and flow lines on- and offshore | Carbon steels ASTM 304/304L ASTM 316/316L ASTM 420 |
Optimal combination of strength weldability, corrosion resistance and cost | |
| - | Tensioning systems on offshore rigs. Instrumentation tubing | ASTM 304/304L ASTM 316/316L Carbon steels |
High strength combined with high corrosion resistance |
Sandvik SAF 2304® mechanical
| Property | Temperature | Value | Comment |
|---|---|---|---|
| Elastic modulus | 20.0 °C | Elastic modulus of 200 GPa | - |
| - | 100.0 °C | Elastic modulus of 194 GPa | - |
| - | 200.0 °C | Elastic modulus of 186 GPa | - |
| - | 300.0 °C | Elastic modulus of 180 GPa | - |
| Elongation | 23.0 °C | Elongation of 25 % | min. |
| Elongation A2 | 23.0 °C | Elongation A2 of 25 % | min. |
| Hardness, Rockwell C | 23.0 °C | Hardness, Rockwell C of 30 [-] | max. |
| Tensile strength | 23.0 °C | Tensile strength of 630 - 820 MPa | For tubes with outside diameter max. 25.4 mm we guarantee 0.2% proof strength 450 MPa and tensile strength min. 690 MPa (ASTM A789). |
| Yield strength Rp0.2 | 20.0 °C | Yield strength Rp0.2 of 400 MPa | min. depending on the wall thickness (For tubes with outside diameter max. 25.4 mm we guarantee 0.2% proof strength 450 MPa and tensile strength min. 690 MPa (ASTM A789). |
| - | 50.0 °C | Yield strength Rp0.2 of 370 - 420 MPa | min. depending on the wall thickness (For tubes with outside diameter max. 25.4 mm we guarantee 0.2% proof strength 450 MPa and tensile strength min. 690 MPa (ASTM A789). |
| - | 100.0 °C | Yield strength Rp0.2 of 330 - 380 MPa | min. depending on the wall thickness (For tubes with outside diameter max. 25.4 mm we guarantee 0.2% proof strength 450 MPa and tensile strength min. 690 MPa (ASTM A789). |
| - | 150.0 °C | Yield strength Rp0.2 of 310 - 360 MPa | min. depending on the wall thickness (For tubes with outside diameter max. 25.4 mm we guarantee 0.2% proof strength 450 MPa and tensile strength min. 690 MPa (ASTM A789). |
| - | 200.0 °C | Yield strength Rp0.2 of 290 - 340 MPa | min. depending on the wall thickness (For tubes with outside diameter max. 25.4 mm we guarantee 0.2% proof strength 450 MPa and tensile strength min. 690 MPa (ASTM A789). |
| - | 250.0 °C | Yield strength Rp0.2 of 280 - 330 MPa | min. depending on the wall thickness (For tubes with outside diameter max. 25.4 mm we guarantee 0.2% proof strength 450 MPa and tensile strength min. 690 MPa (ASTM A789). |
| - | 300.0 °C | Yield strength Rp0.2 of 270 - 310 MPa | min. depending on the wall thickness (For tubes with outside diameter max. 25.4 mm we guarantee 0.2% proof strength 450 MPa and tensile strength min. 690 MPa (ASTM A789). |
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