Duplex Steel F51 (UNS S31803): Product Introduction
Duplex stainless steel F51 (UNS S31803) is a versatile and highly corrosion-resistant alloy known for its excellent combination of mechanical properties and resistance to various corrosive environments. This article provides a comprehensive introduction to Duplex Steel F51 (UNS S31803), covering its chemical composition, mechanical properties, performance at different temperatures, industry applications, shapes and sizes, production standards, welding and processing capabilities, advantages and disadvantages, and a comparison with similar alloys.
화학적 구성 요소
Duplex Steel F51 (UNS S31803) has a balanced chemical composition that contributes to its corrosion resistance and mechanical strength:
| 요소 | 구성 (%) |
|---|---|
| 크롬(Cr) | 21.0 – 23.0 |
| 니켈(Ni) | 4.5 – 6.5 |
| 몰리브덴(Mo) | 2.5 – 3.5 |
| 질소(N) | 0.08 – 0.20 |
| 탄소(C) | 0.030 최대 |
| 실리콘(Si) | 최대 1.00 |
| 망간(Mn) | 2.00 max |
| 인(P) | 0.030 최대 |
| 유황(S) | 0.020 최대 |
기계적 성질
Duplex Steel F51 (UNS S31803) exhibits excellent mechanical properties suitable for a wide range of applications:
| 재산 | 값 |
|---|---|
| 인장 강도, ksi(MPa) | 65 min (450 min) |
| 항복 강도(0.2% 오프셋), ksi(MPa) | 45 min (310 min) |
| 신율(2인치 단위의 %) | 25분 |
| 경도, 로크웰 C(HRC) | 30 max |
성능 특성
Duplex Steel F51 (UNS S31803) offers superior performance across diverse conditions:
- 부식 저항: Excellent resistance to stress corrosion cracking (SCC), pitting, and crevice corrosion in chloride-rich environments, making it suitable for marine and offshore applications.
- 힘: Higher strength compared to austenitic stainless steels, combined with good toughness, ensuring structural integrity in demanding environments.
- 용접성: Good weldability with suitable filler materials and techniques, facilitating ease of fabrication and repair.
산업 응용
Duplex Steel F51 (UNS S31803) finds extensive use in industries requiring robust corrosion resistance and mechanical strength:
| 산업 분야 | 애플리케이션 |
|---|---|
| 석유 및 가스 | Subsea pipelines, offshore platforms, and components exposed to aggressive environments. |
| 화학 처리 | Heat exchangers, storage tanks, and reactor vessels handling corrosive chemicals. |
| 선박 | Propeller shafts, seawater desalination plants, and marine exhaust systems. |
모양과 크기
Duplex Steel F51 (UNS S31803) is available in various forms and sizes to meet specific application needs:
- 양식: 시트, 플레이트, 바, 튜브, 파이프 및 부속품.
- 크기: 플레이트의 경우 두께 범위는 0.5mm ~ 50mm이고, 둥근 막대의 경우 직경 범위는 6mm ~ 300mm입니다.
생산 표준
Duplex Steel F51 (UNS S31803) conforms to international production standards ensuring quality and reliability:
| 제품 형태 | 사용 가능한 모양 | 사용 가능한 크기 | 생산 표준 |
|---|---|---|---|
| 플레이트/시트 | 시트, 플레이트 | 두께: 0.5mm – 50mm | ASTM A240, EN 10088 |
| 바/막대 | 원형바, 사각바 | 직경: 6mm – 300mm | ASTM A276, EN 10088 |
| 파이프/튜브 | 이음매 없는 용접 | 외경: 6mm – 300mm | ASTM A790, ASTM A789 |
용접 및 가공
Duplex Steel F51 (UNS S31803) offers good weldability and processing characteristics:
- 용접: 내식성을 유지하기 위해 적절한 예열 및 용접 후 열처리를 통해 TIG, MIG 및 서브머지드 아크 용접과 같은 표준 방법을 사용하여 용접할 수 있습니다.
- 가공성: 일반적으로 오스테나이트계 스테인리스강보다 낮기 때문에 가공 작업에 더 느린 속도와 더 많은 전력이 필요합니다.
장점과 단점
| 측면 | 세부 |
|---|---|
| 장점 | Excellent corrosion resistance, high strength, cost-effectiveness compared to super austenitic and nickel-based alloys, suitable for a wide range of applications in aggressive environments. |
| 단점 | Lower toughness compared to austenitic stainless steels, may require specialized handling during welding and fabrication due to duplex structure. |
유사한 합금과의 비교
Duplex Steel F51 (UNS S31803) is often compared with other duplex stainless steels such as F60 (UNS S32205) and super austenitic stainless steels like 904L (UNS N08904). Here’s a brief comparison:
| 합금 유형/속성 | 이중 강철 F51(UNS S31803) | Duplex Steel F60 (UNS S32205) | Super Austenitic Stainless Steel (904L, UNS N08904) |
|---|---|---|---|
| 부식 저항 | 공식 및 틈새 부식을 포함한 염화물 유발 부식에 대한 탁월한 내성. | Enhanced resistance to localized corrosion due to higher chromium and molybdenum content. | Good corrosion resistance, lower than duplex stainless steels in chloride environments. |
| 힘 | Higher strength compared to austenitic stainless steels, good toughness. | Similar strength characteristics with improved corrosion resistance. | Lower strength compared to duplex stainless steels, good formability. |
| 애플리케이션 | 석유 및 가스, 화학 처리, 해양 환경. | Similar applications with enhanced corrosion resistance in aggressive chloride environments. | Chemical and pharmaceutical industries, paper production. |
This detailed article introduces Duplex Steel F51 (UNS S31803), highlighting its chemical composition, mechanical properties, performance characteristics, industry applications, available forms and sizes, production standards, welding and processing capabilities, as well as advantages, disadvantages, and a comparison with similar alloys. Engineers and professionals seeking durable materials for applications requiring corrosion resistance and high strength will find this information valuable for selecting the appropriate alloy to meet specific operational needs.