플랜지는 배관 시스템의 필수 구성 요소입니다., 파이프를 연결하는 데 사용, 밸브, 슬리퍼, 그리고 다른 장비. 그들은 힘을 제공합니다, 밀봉, and flexibility for maintenance and inspection. Among the different types of flanges, duplex flanges stand out for their unique material composition and excellent performance in demanding environments.

Duplex flanges are made from duplex stainless steels, which combine the advantages of both austenitic and ferritic microstructures. This results in superior strength, 내식성, and toughness compared to conventional stainless steels. But not all duplex flanges are the same—the specific materials used for manufacturing play a key role in determining their performance.

This article explores the different materials used for duplex flanges, their applications across industries, and the benefits they deliver.

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1. Introduction to Duplex Stainless Steel Flanges

Duplex stainless steel flanges are manufactured from alloys that typically contain:

• Around 22–25% chromium

• 4–7% nickel

• 3–5% molybdenum

• Controlled amounts of nitrogen

This unique balance of alloying elements produces a two-phase microstructure (austenite + 페라이트), which provides a combination of strength and corrosion resistance unmatched by most standard stainless steels.

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2. Different Materials Used for Duplex Flanges

Several grades of duplex stainless steels are commonly used for flanges. Each grade is tailored for specific environmental and mechanical conditions.

에이. Standard Duplex (2205 / UNS S32205)

• 구성: 22% 크롬, 5% 니켈, 3% 몰리브덴.

• 속성: 고강도, twice that of 304 그리고 316 스테인리스강, with excellent resistance to chloride stress corrosion cracking.

• 응용: 석유 및 가스 파이프라인, 화학공장, and marine structures.

비. 슈퍼 듀플렉스 (2507 / UNS S32750)

• 구성: 25% 크롬, 7% 니켈, 4% 몰리브덴, and nitrogen.

• 속성: Even higher strength and superior resistance to pitting and crevice corrosion compared to standard duplex.

• 응용: 해양 플랫폼, subsea pipelines, and desalination plants.

기음. Lean Duplex (UNS S32101 / 2101)

• 구성: Lower nickel (1–2%) and molybdenum levels but higher manganese and nitrogen.

• 속성: More cost-effective, 좋은 내식성, and higher strength than 304/316 스테인리스강.

• 응용: Structural applications, 저장 탱크, and bridges.

디. Hyper Duplex (UNS S32707 / S33207)

• 구성: Very high chromium (27–29%), 니켈 (6–8%), 및 몰리브덴 (최대 5%).

• 속성: Exceptional strength and extreme resistance to aggressive chemical environments.

• 응용: Specialized chemical processing, 산성 식물, and extreme offshore conditions.

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3. Manufacturing of Duplex Flanges

Duplex flanges are produced using forging, 가공, and heat treatment processes to ensure strength and durability. Key types of duplex flanges include:

• 웰드 넥 플랜지

• 슬립온 플랜지

• 소켓 용접 플랜지

• 블라인드 플랜지

• Lap joint flanges

• 스레드 플랜지

All of these flange types benefit from the superior properties of duplex stainless steels.

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4. Applications of Duplex Flanges

Duplex flanges are widely used across multiple industries where strength and corrosion resistance are crucial.

석유 및 가스 산업

• Subsea pipelines and offshore platforms.

• Heat exchangers and pressure vessels.

• High-pressure piping systems.

화학 및 석유화학 산업

• Storage tanks, 원자로, and piping exposed to acids and chlorides.

• Flue gas desulfurization systems.

해양산업

• Shipbuilding components.

• Desalination plants and seawater cooling systems.

Construction and Infrastructure

• Bridges and load-bearing structures.

• Water treatment facilities.

Renewable Energy

• Offshore wind turbine foundations.

• Geothermal energy plants exposed to corrosive brines.

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5. Benefits of Duplex Flanges

에이. 고강도

• Duplex steels have roughly double the yield strength of austenitic stainless steels, allowing the use of thinner and lighter components.

비. 우수한 내식성

• Excellent resistance to pitting, 틈새 부식, 및 염화물 응력 부식 균열.

기음. 비용 효율성

• Reduced material usage due to high strength.

• Lean duplex grades reduce nickel and molybdenum content, lowering overall costs.

디. Extended Service Life

• High durability reduces maintenance frequency and downtime.

이자형. 다재

• Suitable for a wide range of industries from oil and gas to renewable energy and construction.

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6. Duplex Flanges vs. Conventional Stainless Steel Flanges