AISI 329 Duplex Stainless Steel
Standards：AISI 329 ASTM A789 / A790 Grade（UNS）：S32900 Type：Duplex Stainless steel
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AISI 329 duplex stainless Steel Characteristics
AISI 329 (S32900) stainless steel is a duplex stainless steel with high yield strength, up to twice that of austenitic stainless steel.
329 duplex stainless steel has good pitting corrosion resistance, crevice corrosion resistance, oxidation resistance and stress corrosion resistance in chlorine containing water. It is a heat-resistant steel alloy.
329 stainless steel is a kind of high alloy duplex stainless steel. It is often used in heat exchanger and chemical industry in chlorine environment.
AISI 329 stainless steel chemical composition
| C | Mn | Si | Cr | Ni | P | S | Mo | |
| MIN | – | – | – | 23.0 | 2.0 | – | – | 1.2 |
| MAX | 0.08 | 1.00 | 0.75 | 28.0 | 5.0 | 0.04 | 0.03 | 2.0 |
Heat treatment
Fast cooling at 1010 ～ 1150 ℃ for solid solution
AISI 329 Standards
- SS standard: SS 2324 (10RE51)
- GB standard: 0Cr25Ni5Mo2
- ASTM: S32900
- JIS standard: 329JI
- DIN standard W.NR.1.4460
Features
- It has good corrosion resistance
- It is easy to clean
- Excellent strength and toughness at low temperature
- 329 stainless steel has good formability
Applications
- Food processing
- heat exchanger
- Chemical pressure vessel
- Conveyor
- Architecture
Mechanical properties
329 stainless steel physical properties
- Density: 7.93 g·cm-3
- Melting point: 1398～1420
- Resistivity: 0.73 Ω·mm2·m-1/ft
| 329 stainless steel | temperature, °F | 70 | 212 | 932 |
| Coefficient of thermal expansion, in/in°F x 10-6 | – | 9.2 | – | |
| Thermal conductivity ft2 • hr • °F | – | 9.4 | 12.4 | |
| Elastic modulus, psi x 106 | 29 | – | – |
* 70°F to indicated temperature
Typical tensile and impact properties
| 329 stainless steel | temperature, °F | -425 | -320 | -100 | 70 | 400 | 800 | 1200 |
| ultimate tensile strength, ksi | 250 | 230 | 150 | 90 | 70 | 66 | 48 | |
| yield strength, ksi | 100 | 70 | 50 | 35 | 23 | 19 | 15.5 | |
| ft-lbs | 85 | 85 | – | 150 | – | – |
Our duplex stainless steel grades
What is duplex stainless steel ?
Duplex stainless steel is a kind of stainless steel composed of ferrite and austenite. The ferrite content is about 50%, and the austenite content is about 50%. This kind of steel has the characteristics of both austenitic stainless steel and ferritic stainless steel.
About Duplex Stainless Steel Pipe
Duplex stainless steel pipe is one of the main products of our company. It has good corrosion resistance and welding performance. Widely used in steel, smelting, petroleum, chemical, marine equipment and other industries.
Duplex steel applications
Because of the high strength of duplex stainless steel, it can save material, such as reducing the wall thickness of the pipe.
- Oil pipe in oil and natural gas industry
- Crude oil desalting
- Sulfur-containing gas purification
- Wastewater treatment equipment in refinery
- Cooling system using brackish water or chlorine solution
- Read More
Duplex stainless steel properties
Duplex stainless steel has almost twice as much yield strength as austenitic stainless steel, excellent corrosion resistance and weldability, and is widely used in various fields. Read more about the properties of duplex stainless steel