Duplex Steel F55 (UNS S32760): Product Introduction
Duplex stainless steel F55, also known as UNS S32760, is a highly corrosion-resistant alloy with superior mechanical properties. This article provides a comprehensive introduction to Duplex Steel F55 (UNS S32760), 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.
化学組成
Duplex Steel F55 (UNS S32760) has a well-balanced chemical composition that enhances its corrosion resistance and mechanical strength:
| 要素 | 構成 （％） |
|---|---|
| クロム(Cr) | 24.0 – 26.0 |
| ニッケル(Ni) | 6.0 – 8.0 |
| モリブデン(Mo) | 3.0 – 4.0 |
| 銅 | 0.5 – 1.0 |
| タングステン(W) | 0.5 – 1.0 |
| 窒素(N) | 0.20 – 0.30 |
| カーボン(C) | 0最大.030 |
| シリコン（Si） | 最大1.00 |
| マンガン(Mn) | 最大1.00 |
| リン(P) | 0最大.030 |
| 硫黄(S) | 0最大.010 |
機械的性質
Duplex Steel F55 (UNS S32760) exhibits excellent mechanical properties suitable for demanding applications:
| 財産 | 価値 |
|---|---|
| 引張強さ、ksi (MPa) | 109 min (750 min) |
| 降伏強さ (0.2% オフセット)、ksi (MPa) | 80 min (550 min) |
| 伸び (% 単位 2 インチ) | 25分 |
| 硬度、ロックウェル C (HRC) | 32 max |
性能特性
Duplex Steel F55 (UNS S32760) offers superior performance across various conditions:
- 耐食性: Excellent resistance to chloride-induced stress corrosion cracking (SCC), pitting, and crevice corrosion in aggressive environments, such as seawater and chemical processing.
- 強さ： Higher strength compared to standard duplex stainless steels, making it suitable for structural applications requiring high mechanical strength.
- 溶接性: Good weldability with appropriate filler materials and techniques, ensuring ease of fabrication and repair.
産業用途
Duplex Steel F55 (UNS S32760) finds extensive use in industries requiring robust corrosion resistance and high strength:
| 産業部門 | アプリケーション |
|---|---|
| オイルとガス | Offshore and subsea equipment, including pipelines, risers, and subsea umbilicals. |
| 化学処理 | Heat exchangers, pressure vessels, and tanks handling aggressive chemicals. |
| マリン | Seawater desalination plants, marine structural components, and offshore platforms. |
形状とサイズ
Duplex Steel F55 (UNS S32760) is available in various forms and sizes to meet specific application needs:
- フォーム: シート、プレート、バー、チューブ、パイプ、継手。
- サイズ: 板厚は0.5mm～50mm、丸棒は直径6mm～300mmまで対応可能です。
製造基準
Duplex Steel F55 (UNS S32760) adheres to international production standards ensuring quality and reliability:
| 製品形態 | 利用可能な形状 | 利用可能なサイズ | 製造基準 |
|---|---|---|---|
| プレート/シート | シート、プレート | 厚さ：0.5mm～50mm | ASTM A240、EN 10088 |
| バー/ロッド | 丸棒、角棒 | 直径：6mm～300mm | ASTM A276、EN 10088 |
| パイプ/チューブ | シームレス、溶接 | 外径：6mm～300mm | ASTM A790、ASTM A789 |
溶接・加工
Duplex Steel F55 (UNS S32760) offers good weldability and processing characteristics:
- 溶接： 耐食性を維持するために適切な予熱と溶接後の熱処理を行うことで、TIG、MIG、サブマージアーク溶接などの標準的な方法を使用して溶接できます。
- 機械加工性: 一般にオーステナイト系ステンレス鋼よりも低いため、機械加工には遅い速度とより多くの電力が必要になります。
長所と短所
| 側面 | 詳細 |
|---|---|
| 利点 | Exceptional corrosion resistance in aggressive environments, high strength, good weldability, suitable for a wide range of applications in marine, oil and gas, and chemical industries. |
| 短所 | Lower toughness compared to austenitic stainless steels, requires careful handling during welding and fabrication due to its dual-phase microstructure. |
類似合金との比較
Duplex Steel F55 (UNS S32760) is often compared with other duplex stainless steels such as F51 (UNS S31803) and super duplex stainless steels like F53 (UNS S32750). Here’s a brief comparison:
| 合金の種類/特性 | Duplex Steel F55 (UNS S32760) | 二相鋼 F51 (UNS S31803) | Super Duplex Steel F53 (UNS S32750) |
|---|---|---|---|
| 耐食性 | 孔食や隙間腐食を含む塩化物による腐食に対する優れた耐性。 | Excellent resistance, slightly lower than F55 in aggressive chloride environments. | Enhanced resistance to pitting and crevice corrosion, particularly in seawater applications. |
| 強さ | Highest strength among duplex steels, ideal for heavy-duty applications in harsh environments. | High strength with good toughness, suitable for general-purpose applications. | Higher strength compared to standard duplex steels, suitable for structural applications. |
| アプリケーション | Offshore platforms, heat exchangers, and seawater handling systems. | 石油とガス、化学処理、海洋環境。 | Similar applications with broader use in structural and architectural applications. |
This detailed article introduces Duplex Steel F55 (UNS S32760), 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.