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Fujian S32205 Stud Bolt
QS Fastener: Fujian S32205 Stud Bolt
Name: Fujian S32205 Stud Bolt
Material: Duplex Stainless Steel 2205
Standard: UNS S32205
Size: M24
Length: 250mm
Hardness: 290 HB
Application: For Petroleum chemical industry and marine engineering
Feature: High strength: The yield strength is approximately twice that of ordinary 304 or 316 austenitic stainless steel.
Material: Duplex Stainless Steel 2205
Standard: UNS S32205
Size: M24
Length: 250mm
Hardness: 290 HB
Application: For Petroleum chemical industry and marine engineering
Feature: High strength: The yield strength is approximately twice that of ordinary 304 or 316 austenitic stainless steel.
Quantity
S32205 Duplex Stainless Steel Stud, material S32205, size M24×250mm, hardness 290 HB. This S32205 Stud Bolt has a yield strength approximately twice that of ordinary 304/316 austenitic stainless steel, combining high strength and excellent corrosion resistance. Designed specifically for harsh working conditions such as petrochemical and marine engineering, it is a reliable fastener in high-pressure, highly corrosive environments.
Is 2205 stainless better than 316?
The advantages of duplex stainless steel 2205 over 316 stainless steel are mainly reflected in three aspects: strength, localized corrosion resistance, and resistance to stress corrosion cracking. 316 is well-balanced in various aspects, while duplex stainless steel 2205 performs better in specific harsh environments. For the S32205 Stud Bolt, these advantages are particularly prominent in fastener applications.
The advantages of duplex stainless steel 2205 over 316 stainless steel are mainly reflected in three aspects: strength, localized corrosion resistance, and resistance to stress corrosion cracking. 316 is well-balanced in various aspects, while duplex stainless steel 2205 performs better in specific harsh environments. For the S32205 Stud Bolt, these advantages are particularly prominent in fastener applications.
1. Higher Strength, Less Material Usage
The yield strength of duplex stainless steel (approximately 450 MPa) is usually more than twice that of 316 stainless steel (approximately 205–225 MPa). This means that when designing structures or equipment, thinner walls and smaller-diameter studs can be used to withstand the same pressure. For your S32205 Stud Bolt product, it provides higher tightening force and fatigue resistance, making it more reliable under high-pressure conditions while also reducing the overall weight of the equipment.
The yield strength of duplex stainless steel (approximately 450 MPa) is usually more than twice that of 316 stainless steel (approximately 205–225 MPa). This means that when designing structures or equipment, thinner walls and smaller-diameter studs can be used to withstand the same pressure. For your S32205 Stud Bolt product, it provides higher tightening force and fatigue resistance, making it more reliable under high-pressure conditions while also reducing the overall weight of the equipment.
2. Stronger Resistance to Chloride Corrosion, Especially Suitable for Marine Environments
In chloride-containing environments (such as seawater, salt spray, and chemical plant media containing chlorides), the pitting and crevice corrosion resistance of duplex stainless steel is far superior to that of 316. The pitting resistance equivalent number (PREN) is often used for quantitative assessment: 316 has a PREN value of approximately 25–27, while 2205 has a PREN value as high as 34–37. Therefore, after using the S32205 Stud Bolt, while 316 may develop rust spots (pitting) after a period of use in coastal or seawater environments, the S32205 Stud Bolt remains intact over the long term.
In chloride-containing environments (such as seawater, salt spray, and chemical plant media containing chlorides), the pitting and crevice corrosion resistance of duplex stainless steel is far superior to that of 316. The pitting resistance equivalent number (PREN) is often used for quantitative assessment: 316 has a PREN value of approximately 25–27, while 2205 has a PREN value as high as 34–37. Therefore, after using the S32205 Stud Bolt, while 316 may develop rust spots (pitting) after a period of use in coastal or seawater environments, the S32205 Stud Bolt remains intact over the long term.
3. Excellent Resistance to Stress Corrosion Cracking
This is one of the most prominent advantages of duplex stainless steel. Austenitic stainless steel 316 is very prone to sudden brittle fracture—i.e., stress corrosion cracking—when tensile stress, specific corrosive media (such as chlorides or hot alkalis), and a certain temperature (approximately above 60°C) exist simultaneously. The dual-phase structure of duplex stainless steel makes it less susceptible to such brittle failure under these destructive conditions. In harsh working conditions such as petrochemical plants, heat exchangers, and boiler pipes involving high temperatures, chlorides, and residual stress, 316 presents a risk of failure, while the S32205 Stud Bolt is a safer and more durable choice.
This is one of the most prominent advantages of duplex stainless steel. Austenitic stainless steel 316 is very prone to sudden brittle fracture—i.e., stress corrosion cracking—when tensile stress, specific corrosive media (such as chlorides or hot alkalis), and a certain temperature (approximately above 60°C) exist simultaneously. The dual-phase structure of duplex stainless steel makes it less susceptible to such brittle failure under these destructive conditions. In harsh working conditions such as petrochemical plants, heat exchangers, and boiler pipes involving high temperatures, chlorides, and residual stress, 316 presents a risk of failure, while the S32205 Stud Bolt is a safer and more durable choice.
The following table can help you make the right choice:
| Property | 2205 | 316 | Which is better? |
| Yield Strength | ~450 MPa | ~205–225 MPa | Duplex |
| Pitting/Crevice Corrosion Resistance | Excellent (PREN 34–37) | Good (PREN 25–27) | Duplex |
| Stress Corrosion Cracking Resistance | Excellent (largely immune) | Poor (highly sensitive) | Duplex |
| Formability | Poor (rapid work hardening) | Excellent | 316 |
| Welding Process Requirements | High (heat input control needed) | Mature and simple | 316 |
| Applicable Temperature Range | -50°C ~ 250°C | -196°C ~ 800°C | 316 |
| Material Cost | Higher | Lower | 316 |
Conclusion:
The"superiority"of duplex stainless steel is conditional—it is far better than 316 in harsh environments requiring high strength, chloride corrosion resistance, and resistance to stress corrosion cracking. The S32205 Stud Bolt is the ideal fastener for such demanding conditions. However, if you are dealing with complex forming, extremely low or high temperatures, or cost-sensitive ordinary environments, 316 remains a more suitable choice.
The"superiority"of duplex stainless steel is conditional—it is far better than 316 in harsh environments requiring high strength, chloride corrosion resistance, and resistance to stress corrosion cracking. The S32205 Stud Bolt is the ideal fastener for such demanding conditions. However, if you are dealing with complex forming, extremely low or high temperatures, or cost-sensitive ordinary environments, 316 remains a more suitable choice.
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