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.
化學成分
1.4547/UNS S31254/F44/254 SMO has a specific chemical composition that contributes to its corrosion resistance and mechanical properties:
| 元素 | 作品 （％） |
|---|---|
| 鉻 (Cr) | 19.5 – 20.5 |
| 鎳 (Ni) | 17.5 – 18.5 |
| 鉬（Mo） | 6.0 – 6.5 |
| 銅 | 0.5 – 1.0 |
| 氮 (N) | 0.18 – 0.22 |
| 碳（C） | 0最大.020 |
| 矽（Si） | 0.80 max |
| 錳（Mn） | 最大 1.00 |
| 磷（P） | 0最大.030 |
| 硫（S） | 0最大.010 |
機械性質
1.4547/UNS S31254/F44/254 SMO exhibits excellent mechanical properties suitable for various applications:
| 財產 | 價值 |
|---|---|
| 拉伸強度，ksi (MPa) | 100 (690) 分鐘 |
| 屈服強度（0.2% 偏移），ksi (MPa) | 50 (345) 分鐘 |
| 伸長率（2 英吋中的%） | 35分鐘 |
| 硬度，洛氏 B (HRB) | 最多 55 |
性能特點
1.4547/UNS S31254/F44/254 SMO offers outstanding performance across diverse conditions:
- 耐腐蝕性能： Excellent resistance to both uniform corrosion and localized corrosion, including pitting and crevice corrosion, in chloride-containing environments.
- 高溫強度： Maintains strength and toughness at elevated temperatures, suitable for applications in marine and chemical processing industries.
- 焊接性： Good weldability with conventional methods, such as TIG and MIG welding, ensuring ease of fabrication.
產業應用
1.4547/UNS S31254/F44/254 SMO is utilized in industries requiring robust corrosion resistance and high strength:
| 工業部門 | 應用領域 |
|---|---|
| 化學加工 | Heat exchangers, evaporators, and reactor tanks. |
| 油和氣 | Offshore platforms, pipelines, and valves in harsh environments. |
| 海洋 | Seawater desalination, marine exhaust systems, and shipbuilding. |
形狀和尺寸
1.4547/UNS S31254/F44/254 SMO is available in various forms and sizes to meet specific application needs:
- 形式： Sheets, plates, bars, tubes, pipes, fittings, and welding consumables.
- 尺寸： Thickness ranging from 0.1 mm to 50 mm for plates, and diameter ranging from 6 mm to 300 mm for round bars.
生產標準
1.4547/UNS S31254/F44/254 SMO adheres to international production standards ensuring quality and performance:
| 產品形態 | 可用形狀 | 可供選擇的尺寸 | 生產標準 |
|---|---|---|---|
| 板材/片材 | 板材、板材 | 厚度：0.1 毫米 – 50 毫米 | ASTM A240、EN 10088 |
| 棒材/棒材 | 圓棒、方棒 | 直徑：6 毫米 – 300 毫米 | ASTM A276、EN 10088 |
| 管道/管材 | 無縫、焊接 | 外徑：6 毫米 – 300 毫米 | ASTM A312, ASTM A358 |
焊接及加工
1.4547/UNS S31254/F44/254 SMO offers good weldability and processing characteristics:
- 焊接： Can be welded using standard methods like TIG, MIG, and submerged arc welding, with post-weld heat treatment recommended to maintain corrosion resistance.
- 機械加工性： Machinable with appropriate tooling and cutting speeds due to its high work hardening rate.
的優點和缺點
| 方面 | 細節 |
|---|---|
| 優點 | Exceptional corrosion resistance, high strength, excellent weldability, and suitability for critical applications in aggressive environments. |
| 缺點 | Higher initial cost compared to standard stainless steels, requires expertise in handling and fabrication due to its high alloy content. |
類似合金
| 合金名稱 | 比較 |
|---|---|
| 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. |
類似合金的比較
| 屬性/特徵 | 1.4547/UNS S31254/F44/254 SMO | 904L (UNS N08904) | Duplex Stainless Steel (UNS S31803) |
|---|---|---|---|
| 鉻含量(%) | 19.5 – 20.5 | 20.0 – 25.0 | 21.0 – 23.0 |
| 鎳含量(%) | 17.5 – 18.5 | 23.0 – 28.0 | 4.5 – 6.5 |
| 鉬含量(%) | 6.0 – 6.5 | 4.0 – 5.0 | 2.5 – 3.5 |
| 耐腐蝕性能 | 優異的耐氯化物引起的腐蝕能力，包括點蝕和縫隙腐蝕。 | 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. |
| 應用領域 | Chemical processing, oil and gas, marine environments. | Chemical and pharmaceutical industries, paper production. | 石油和天然氣、化學加工、海洋環境。 |
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.