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.
Химический состав
1.4547/UNS S31254/F44/254 SMO has a specific chemical composition that contributes to its corrosion resistance and mechanical properties:
| Элемент | Состав (%) |
|---|---|
| Хром (Cr) | 19.5 – 20.5 |
| Никель (Ni) | 17.5 – 18.5 |
| Молибден (Мо) | 6.0 – 6.5 |
| Медь | 0.5 – 1.0 |
| Азот (Н) | 0.18 – 0.22 |
| Углерод (С) | 00,020 макс. |
| Кремний (Si) | 0.80 max |
| Марганец (Mn) | 1,00 макс. |
| Фосфор (Р) | 00,030 макс. |
| Сера (S) | 00,010 макс. |
Механические свойства
1.4547/UNS S31254/F44/254 SMO exhibits excellent mechanical properties suitable for various applications:
| Свойство | Ценить |
|---|---|
| Предел прочности, тыс.фунтов на квадратный дюйм (МПа) | 100 (690) мин |
| Предел текучести (смещение 0,2%), тыс.фунтов на квадратный дюйм (МПа) | 50 (345) мин. |
| Удлинение (% на 2 дюйма) | 35 min |
| Твердость, Роквелл B (HRB) | 55 max |
Характеристики производительности
1.4547/UNS S31254/F44/254 SMO offers outstanding performance across diverse conditions:
- Устойчивость к коррозии: Excellent resistance to both uniform corrosion and localized corrosion, including pitting and crevice corrosion, in chloride-containing environments.
- Высокотемпературная прочность: Maintains strength and toughness at elevated temperatures, suitable for applications in marine and chemical processing industries.
- Свариваемость: Good weldability with conventional methods, such as TIG and MIG welding, ensuring ease of fabrication.
Промышленные приложения
1.4547/UNS S31254/F44/254 SMO is utilized in industries requiring robust corrosion resistance and high strength:
| Промышленный сектор | Приложения |
|---|---|
| Химическая обработка | Heat exchangers, evaporators, and reactor tanks. |
| Нефти и газа | Offshore platforms, pipelines, and valves in harsh environments. |
| морской | Seawater desalination, marine exhaust systems, and shipbuilding. |
Формы и размеры
1.4547/UNS S31254/F44/254 SMO is available in various forms and sizes to meet specific application needs:
- Формы: Sheets, plates, bars, tubes, pipes, fittings, and welding consumables.
- Размеры: Thickness ranging from 0.1 mm to 50 mm for plates, and diameter ranging from 6 mm to 300 mm for round bars.
Производственные стандарты
1.4547/UNS S31254/F44/254 SMO adheres to international production standards ensuring quality and performance:
| Форма продукта | Доступные формы | Доступные размеры | Производственные стандарты |
|---|---|---|---|
| Плиты/листы | Листы, плиты | Толщина: 0,1 мм – 50 мм | АСТМ А240, ЭН 10088 |
| Бары/стержни | Круглые стержни, Квадратные стержни | Диаметр: 6 мм – 300 мм | АСТМ А276, ЭН 10088 |
| Трубы/Трубы | Бесшовные, Сварные | НД: 6 мм – 300 мм | ASTM A312, ASTM A358 |
Сварка и обработка
1.4547/UNS S31254/F44/254 SMO offers good weldability and processing characteristics:
- Сварка: Can be welded using standard methods like TIG, MIG, and submerged arc welding, with post-weld heat treatment recommended to maintain corrosion resistance.
- Обрабатываемость: Machinable with appropriate tooling and cutting speeds due to its high work hardening rate.
Преимущества и недостатки
| Аспект | Подробности |
|---|---|
| Преимущества | Exceptional corrosion resistance, high strength, excellent weldability, and suitability for critical applications in aggressive environments. |
| Недостатки | Higher initial cost compared to standard stainless steels, requires expertise in handling and fabrication due to its high alloy content. |
Подобные сплавы
| Название сплава | Сравнение |
|---|---|
| 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. |
Сравнение подобных сплавов
| Свойство/Особенность | 1.4547/UNS S31254/F44/254 SMO | 904L (UNS N08904) | Duplex Stainless Steel (UNS S31803) |
|---|---|---|---|
| Содержание хрома (%) | 19.5 – 20.5 | 20.0 – 25.0 | 21.0 – 23.0 |
| Содержание никеля (%) | 17.5 – 18.5 | 23.0 – 28.0 | 4,5 – 6,5 |
| Содержание молибдена (%) | 6.0 – 6.5 | 4.0 – 5.0 | 2,5 – 3,5 |
| Устойчивость к коррозии | Превосходная стойкость к хлоридной коррозии, включая точечную и щелевую коррозию. | 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. |
| Приложения | Chemical processing, oil and gas, marine environments. | Химическая и фармацевтическая промышленность, производство бумаги. | Нефть и газ, химическая обработка, морская среда. |
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.