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Putian 2205 Double End Stud
QS Fastener: Putian 2205 Double End Stud
Name: Putian 2205 Double End Stud
Material: Duplex Stainless Steel 2205
Standard: UNS S32205
Size: M24
Hardness: 290 HB
Length: 250 mm
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
Hardness: 290 HB
Length: 250 mm
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.
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What is Duplex Stainless Steel 2205?
2205 is a type of duplex stainless steel that combines the advantages of both austenitic and ferritic stainless steels. It is renowned for its high strength and excellent corrosion resistance, particularly in environments containing chloride ions, making it one of the most commonly used duplex steel grades on the market.
Is 2205 Stainless Better than 316?
Technical Comparison between 2205 Duplex Stainless Steel and 316 Austenitic Stainless Steel
Technical Comparison between 2205 Duplex Stainless Steel and 316 Austenitic Stainless Steel
The relative merits of 2205 duplex stainless steel versus 316 austenitic stainless steel depend on the specific application conditions and technical requirements. The two materials exhibit significant differences in chemical composition, mechanical properties, corrosion resistance mechanisms, and process suitability. A systematic technical comparison is provided below:
1. Composition and Structural Characteristics
2205 Duplex Stainless Steel: Its microstructure consists of approximately equal proportions of ferrite (α) and austenite (γ) phases. The typical composition includes approximately 22% Chromium (Cr), 5-6% Nickel (Ni), 3% Molybdenum (Mo), with the addition of Nitrogen (N) for strengthening. The duplex structure is the fundamental reason for its high strength and resistance to stress corrosion cracking. This is also the fundamental reason why the **2205 Double End Stud** can maintain excellent performance under harsh working conditions.
316 Austenitic Stainless Steel: Its microstructure is single-phase austenite. The typical composition is Chromium (Cr) 16-18%, Nickel (Ni) 10-14%, and Molybdenum (Mo) 2-3%. The higher nickel content ensures a stable austenitic structure and excellent formability.
2. Mechanical Property Comparison
Strength: The yield strength of 2205 is typically around 450-550 MPa, approximately twice that of 316 (approximately 210-310 MPa). This means that when designing pipeline connections or pressure vessels, using a 2205 Double End Stud as a fastener can achieve structural weight reduction and lightweighting while ensuring connection strength.
Plasticity and Toughness: 316 typically exhibits superior elongation and reduction of area compared to 2205, demonstrating better plasticity and low-temperature toughness. The toughness of 2205 decreases significantly below -50°C. Therefore, the lower application temperature limit for a 2205 Double End Stud is typically constrained by this, and it is not recommended for extremely low-temperature environments.
3. Corrosion Resistance Comparison
Uniform Corrosion: In most oxidizing acid media, due to its higher chromium content, 2205 exhibits superior resistance to uniform corrosion compared to 316. This enables fasteners like the 2205 Double End Stud made from 2205 material to have a longer service life in chemical equipment.
Localized Corrosion: Resistance to pitting and crevice corrosion is a key differentiator between the two. 2205 typically has a Pitting Resistance Equivalent Number (PREN = Cr + 3.3Mo + 16N) above 34, while 316 is approximately 23-26. Therefore, in media containing chloride ions (such as seawater or de-icing salt environments), using a 2205 Double End Stud to connect flanges or equipment provides significantly superior resistance to pitting and crevice corrosion compared to fasteners made from 316 material.
Stress Corrosion Cracking: This is the most significant performance short slab of 316. Austenitic stainless steels are highly susceptible to stress corrosion cracking under the combined action of tensile stress and specific corrosive media (such as chlorides or hydroxides). In contrast, the duplex structure of 2205 provides inherent immunity to stress corrosion cracking. Therefore, in applications with such risks, such as on offshore platforms or in chemical plants, the reliability of selecting a 2205 Double End Stud is far superior to that of 316 material.
4. Economic Considerations and Application Selection Recommendations
Cost: The alloying cost (especially for molybdenum and chromium) of 2205 is higher than that of 316. Consequently, the unit price of a 2205 Double End Stud is typically significantly higher than that of a stud bolt made from 316 material.
Application Recommendations:
Preferred scenarios for selecting 2205 include: Environments with high chloride ion content (e.g., offshore platforms, desalination plants, chemical evaporators); applications involving the risk of chloride stress corrosion cracking; and situations requiring weight reduction design for pressure vessels or mobile storage tanks by leveraging its high strength. In these scenarios, selecting the 2205 Double End Stud as a critical connecting component, although involving a higher initial investment, proves more economical over the full lifecycle.
Preferred scenarios for selecting 2205 include: Environments with high chloride ion content (e.g., offshore platforms, desalination plants, chemical evaporators); applications involving the risk of chloride stress corrosion cracking; and situations requiring weight reduction design for pressure vessels or mobile storage tanks by leveraging its high strength. In these scenarios, selecting the 2205 Double End Stud as a critical connecting component, although involving a higher initial investment, proves more economical over the full lifecycle.
Preferred scenarios for selecting 316 include: Components requiring high forming complexity and multiple cold working operations; general corrosion resistance needs in conventional, chlorine-free or low-chlorine environments; extremely low-temperature (below -50°C) or high-temperature (above 300°C) conditions; and general industrial applications where budget constraints exist and performance requirements are moderate.
Summary: 2205 possesses significant technical advantages in mechanical strength, resistance to chloride-induced localized corrosion, and resistance to stress corrosion cracking. However, its cost is higher and its processability is relatively poorer. These advantages are particularly evident when manufacturing high-performance fasteners like the 2205 Double End Stud. 316, with its excellent comprehensive processability, wide service temperature range, and mature supply chain, remains a standard engineering material for general corrosive environments. Material selection must be based on a technical and economic evaluation considering specific service conditions and design life.
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Website:www.qishine.com
Email: qishine@qishine.com
Tel: 0592-5225595
WhatsApp: +86 15960259563
+86 15985833169
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