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.
Thành phần hóa học
1.4547/UNS S31254/F44/254 SMO has a specific chemical composition that contributes to its corrosion resistance and mechanical properties:
| Yếu tố | Thành phần (%) |
|---|---|
| Crom (Cr) | 19,5 – 20,5 |
| Niken (Ni) | 17.5 – 18.5 |
| Molypden (Mo) | 6,0 – 6,5 |
| Đồng | 00,5 – 1,0 |
| Nitơ (N) | 00,18 – 0,22 |
| Cacbon (C) | 0tối đa 0,020 |
| Silic (Si) | 0tối đa 0,80 |
| Mangan (Mn) | 1.00 max |
| Phốt pho (P) | 0tối đa 0,030 |
| Lưu huỳnh (S) | 0tối đa 0,010 |
Tính chất cơ học
1.4547/UNS S31254/F44/254 SMO exhibits excellent mechanical properties suitable for various applications:
| Tài sản | Giá trị |
|---|---|
| Độ bền kéo, ksi (MPa) | 100 (690) phút |
| Cường độ năng suất (bù 0,2%), ksi (MPa) | 50 (345) min |
| Độ giãn dài (% tính bằng 2 inch) | 35 phút |
| Độ cứng, Rockwell B (HRB) | tối đa 55 |
Đặc tính hiệu suất
1.4547/UNS S31254/F44/254 SMO offers outstanding performance across diverse conditions:
- Chống ăn mòn: Excellent resistance to both uniform corrosion and localized corrosion, including pitting and crevice corrosion, in chloride-containing environments.
- Độ bền nhiệt độ cao: Maintains strength and toughness at elevated temperatures, suitable for applications in marine and chemical processing industries.
- Khả năng hàn: Good weldability with conventional methods, such as TIG and MIG welding, ensuring ease of fabrication.
Ứng dụng công nghiệp
1.4547/UNS S31254/F44/254 SMO is utilized in industries requiring robust corrosion resistance and high strength:
| Ngành công nghiệp | Các ứng dụng |
|---|---|
| Xử lý hóa học | Heat exchangers, evaporators, and reactor tanks. |
| Dầu khí | Offshore platforms, pipelines, and valves in harsh environments. |
| Hàng hải | Seawater desalination, marine exhaust systems, and shipbuilding. |
Hình dạng và kích thước
1.4547/UNS S31254/F44/254 SMO is available in various forms and sizes to meet specific application needs:
- Các hình thức: Sheets, plates, bars, tubes, pipes, fittings, and welding consumables.
- Kích thước: Thickness ranging from 0.1 mm to 50 mm for plates, and diameter ranging from 6 mm to 300 mm for round bars.
Tiêu chuẩn sản xuất
1.4547/UNS S31254/F44/254 SMO adheres to international production standards ensuring quality and performance:
| Mẫu sản phẩm | Hình dạng có sẵn | Kích cỡ có sẵn | Tiêu chuẩn sản xuất |
|---|---|---|---|
| Tấm/tấm | Tấm, tấm | Độ dày: 0,1 mm – 50 mm | ASTM A240, EN 10088 |
| Thanh/Thanh | Thanh tròn, thanh vuông | Đường kính: 6 mm – 300 mm | ASTM A276, EN 10088 |
| Ống/Ống | Liền mạch, hàn | Đường kính ngoài: 6 mm – 300 mm | ASTM A312, ASTM A358 |
Hàn và Gia công
1.4547/UNS S31254/F44/254 SMO offers good weldability and processing characteristics:
- Hàn: Can be welded using standard methods like TIG, MIG, and submerged arc welding, with post-weld heat treatment recommended to maintain corrosion resistance.
- Khả năng gia công: Machinable with appropriate tooling and cutting speeds due to its high work hardening rate.
Ưu điểm và nhược điểm
| Diện mạo | Chi tiết |
|---|---|
| Thuận lợi | Exceptional corrosion resistance, high strength, excellent weldability, and suitability for critical applications in aggressive environments. |
| Nhược điểm | Higher initial cost compared to standard stainless steels, requires expertise in handling and fabrication due to its high alloy content. |
Hợp kim tương tự
| Tên hợp kim | So sánh |
|---|---|
| 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. |
So sánh các hợp kim tương tự
| Thuộc tính/Tính năng | 1.4547/UNS S31254/F44/254 SMO | 904L (UNS N08904) | Duplex Stainless Steel (UNS S31803) |
|---|---|---|---|
| Hàm lượng crom (%) | 19,5 – 20,5 | 20.0 – 25.0 | 21.0 – 23.0 |
| Hàm lượng niken (%) | 17.5 – 18.5 | 23.0 – 28.0 | 4,5 – 6,5 |
| Hàm lượng molypden (%) | 6,0 – 6,5 | 4.0 – 5.0 | 2,5 – 3,5 |
| Chống ăn mòn | Khả năng chống ăn mòn do clorua gây ra tuyệt vời bao gồm ăn mòn rỗ và kẽ hở. | 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. |
| Các ứng dụng | Chemical processing, oil and gas, marine environments. | Chemical and pharmaceutical industries, paper production. | Dầu khí, xử lý hóa chất, môi trường biển. |
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.