Duplex Steel F51 (UNS S31803): Product Introduction
Duplex stainless steel F51 (UNS S31803) is a versatile and highly corrosion-resistant alloy known for its excellent combination of mechanical properties and resistance to various corrosive environments. This article provides a comprehensive introduction to Duplex Steel F51 (UNS S31803), 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
Duplex Steel F51 (UNS S31803) has a balanced chemical composition that contributes to its corrosion resistance and mechanical strength:
| 元素 | 作品 （％） |
|---|---|
| 鉻 (Cr) | 21.0 – 23.0 |
| 鎳 (Ni) | 4.5 – 6.5 |
| 鉬（Mo） | 2.5 – 3.5 |
| 氮 (N) | 0.08 – 0.20 |
| 碳（C） | 0最大.030 |
| 矽（Si） | 最大 1.00 |
| 錳（Mn） | 2.00 max |
| 磷（P） | 0最大.030 |
| 硫（S） | 0最大.020 |
機械性質
Duplex Steel F51 (UNS S31803) exhibits excellent mechanical properties suitable for a wide range of applications:
| 財產 | 價值 |
|---|---|
| 拉伸強度，ksi (MPa) | 65 分鐘（450 分鐘） |
| 屈服強度（0.2% 偏移），ksi (MPa) | 45 min (310 min) |
| 伸長率（2 英吋中的%） | 25分鐘 |
| 硬度，洛氏 C (HRC) | 最多 30 個 |
性能特點
Duplex Steel F51 (UNS S31803) offers superior performance across diverse conditions:
- 耐腐蝕性能： Excellent resistance to stress corrosion cracking (SCC), pitting, and crevice corrosion in chloride-rich environments, making it suitable for marine and offshore applications.
- 力量： Higher strength compared to austenitic stainless steels, combined with good toughness, ensuring structural integrity in demanding environments.
- 焊接性： Good weldability with suitable filler materials and techniques, facilitating ease of fabrication and repair.
產業應用
Duplex Steel F51 (UNS S31803) finds extensive use in industries requiring robust corrosion resistance and mechanical strength:
| 工業部門 | 應用領域 |
|---|---|
| 油和氣 | Subsea pipelines, offshore platforms, and components exposed to aggressive environments. |
| 化學加工 | Heat exchangers, storage tanks, and reactor vessels handling corrosive chemicals. |
| 海洋 | Propeller shafts, seawater desalination plants, and marine exhaust systems. |
形狀和尺寸
Duplex Steel F51 (UNS S31803) is available in various forms and sizes to meet specific application needs:
- 形式： 板材、板材、棒材、管材、管道和配件。
- 尺寸： 板材厚度範圍為 0.5 毫米至 50 毫米，圓鋼直徑範圍為 6 毫米至 300 毫米。
生產標準
Duplex Steel F51 (UNS S31803) conforms to international production standards ensuring quality and reliability:
| 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：0.5 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 A790、ASTM A789 |
焊接及加工
Duplex Steel F51 (UNS S31803) offers good weldability and processing characteristics:
- 焊接： 可以使用 TIG、MIG 和埋弧焊等標準方法進行焊接，並進行適當的預熱和焊後熱處理以保持耐腐蝕性。
- 機械加工性： 通常低於奧氏體不銹鋼，需要更慢的速度和更大的功率來進行加工操作。
的優點和缺點
| 方面 | 細節 |
|---|---|
| 優點 | Excellent corrosion resistance, high strength, cost-effectiveness compared to super austenitic and nickel-based alloys, suitable for a wide range of applications in aggressive environments. |
| 缺點 | Lower toughness compared to austenitic stainless steels, may require specialized handling during welding and fabrication due to duplex structure. |
與類似合金的比較
Duplex Steel F51 (UNS S31803) is often compared with other duplex stainless steels such as F60 (UNS S32205) and super austenitic stainless steels like 904L (UNS N08904). Here’s a brief comparison:
| 合金類型/性能 | 雙相鋼 F51 (UNS S31803) | 雙相鋼 F60 (UNS S32205) | Super Austenitic Stainless Steel (904L, UNS N08904) |
|---|---|---|---|
| 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。 | Enhanced resistance to localized corrosion due to higher chromium and molybdenum content. | Good corrosion resistance, lower than duplex stainless steels in chloride environments. |
| 力量 | Higher strength compared to austenitic stainless steels, good toughness. | Similar strength characteristics with improved corrosion resistance. | Lower strength compared to duplex stainless steels, good formability. |
| 應用領域 | 石油和天然氣、化學加工、海洋環境。 | Similar applications with enhanced corrosion resistance in aggressive chloride environments. | Chemical and pharmaceutical industries, paper production. |
This detailed article introduces Duplex Steel F51 (UNS S31803), 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.