1.4547 / UNS S31254 / F44 / 254 SMO: Product Introduction
1.4547, also known as UNS S31254, F44, or commonly referred to as 254 SMO, is a high-alloy austenitic stainless steel with excellent corrosion resistance. This article provides a detailed introduction to 1.4547/UNS S31254/F44/254 SMO, 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
1.4547/UNS S31254/F44/254 SMO has a specific chemical composition that contributes to its corrosion resistance and mechanical properties:
| 요소 | 구성 (%) |
|---|---|
| 크롬(Cr) | 19.5 – 20.5 |
| 니켈(Ni) | 17.5 – 18.5 |
| 몰리브덴(Mo) | 6.0 – 6.5 |
| 구리 | 0.5 – 1.0 |
| 질소(N) | 0.18 – 0.22 |
| 탄소(C) | 0.020 max |
| 실리콘(Si) | 0.80 max |
| 망간(Mn) | 최대 1.00 |
| 인(P) | 0.030 최대 |
| 유황(S) | 0.010 최대 |
기계적 성질
1.4547/UNS S31254/F44/254 SMO exhibits excellent mechanical properties suitable for various applications:
| 재산 | 값 |
|---|---|
| 인장 강도, ksi(MPa) | 100 (690) min |
| 항복 강도(0.2% 오프셋), ksi(MPa) | 50 (345) min |
| 신율(2인치 단위의 %) | 35 min |
| 경도, 로크웰 B(HRB) | 55 max |
성능 특성
1.4547/UNS S31254/F44/254 SMO offers outstanding performance across diverse conditions:
- 부식 저항: Excellent resistance to both uniform corrosion and localized corrosion, including pitting and crevice corrosion, in chloride-containing environments.
- 고온 강도: Maintains strength and toughness at elevated temperatures, suitable for applications in marine and chemical processing industries.
- 용접성: Good weldability with conventional methods, such as TIG and MIG welding, ensuring ease of fabrication.
산업 응용
1.4547/UNS S31254/F44/254 SMO is utilized in industries requiring robust corrosion resistance and high strength:
| 산업 분야 | 애플리케이션 |
|---|---|
| 화학 처리 | Heat exchangers, evaporators, and reactor tanks. |
| 석유 및 가스 | Offshore platforms, pipelines, and valves in harsh environments. |
| 선박 | Seawater desalination, marine exhaust systems, and shipbuilding. |
모양과 크기
1.4547/UNS S31254/F44/254 SMO is available in various forms and sizes to meet specific application needs:
- 양식: Sheets, plates, bars, tubes, pipes, fittings, and welding consumables.
- 크기: Thickness ranging from 0.1 mm to 50 mm for plates, and diameter ranging from 6 mm to 300 mm for round bars.
생산 표준
1.4547/UNS S31254/F44/254 SMO adheres to international production standards ensuring quality and performance:
| 제품 형태 | 사용 가능한 모양 | 사용 가능한 크기 | 생산 표준 |
|---|---|---|---|
| 플레이트/시트 | 시트, 플레이트 | 두께: 0.1mm – 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 A312, ASTM A358 |
용접 및 가공
1.4547/UNS S31254/F44/254 SMO offers good weldability and processing characteristics:
- 용접: Can be welded using standard methods like TIG, MIG, and submerged arc welding, with post-weld heat treatment recommended to maintain corrosion resistance.
- 가공성: Machinable with appropriate tooling and cutting speeds due to its high work hardening rate.
장점과 단점
| 측면 | 세부 |
|---|---|
| 장점 | Exceptional corrosion resistance, high strength, excellent weldability, and suitability for critical applications in aggressive environments. |
| 단점 | Higher initial cost compared to standard stainless steels, requires expertise in handling and fabrication due to its high alloy content. |
유사한 합금
| 합금 이름 | 비교 |
|---|---|
| 904L (UNS N08904) | Lower alloy content, slightly lower corrosion resistance compared to 1.4547/UNS S31254/F44/254 SMO, but more cost-effective. |
| Duplex Stainless Steels (e.g., UNS S31803) | Offers a balance of strength and corrosion resistance, suitable for similar applications in marine and chemical industries. |
유사한 합금의 비교
| 속성/특징 | 1.4547/UNS S31254/F44/254 SMO | 904L (UNS N08904) | Duplex Stainless Steel (UNS S31803) |
|---|---|---|---|
| 크롬 함량(%) | 19.5 – 20.5 | 20.0 – 25.0 | 21.0 – 23.0 |
| 니켈 함량(%) | 17.5 – 18.5 | 23.0 – 28.0 | 4.5 – 6.5 |
| 몰리브덴 함량(%) | 6.0 – 6.5 | 4.0 – 5.0 | 2.5 – 3.5 |
| 부식 저항 | 공식 및 틈새 부식을 포함한 염화물 유발 부식에 대한 탁월한 내성. | Good corrosion resistance, lower than 1.4547/UNS S31254/F44/254 SMO in chloride environments. | Balanced corrosion resistance, lower than 1.4547/UNS S31254/F44/254 SMO in extreme chloride environments. |
| 애플리케이션 | Chemical processing, oil and gas, marine environments. | Chemical and pharmaceutical industries, paper production. | 석유 및 가스, 화학 처리, 해양 환경. |
This comprehensive article introduces 1.4547/UNS S31254/F44/254 SMO, 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 comparisons with similar alloys. Engineers and professionals seeking highly corrosion-resistant materials for critical applications will find this information valuable in selecting the appropriate alloy to meet specific operational requirements.