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.
化学組成
1.4547/UNS S31254/F44/254 SMO has a specific chemical composition that contributes to its corrosion resistance and mechanical properties:
| 要素 | 構成 （％） |
|---|---|
| クロム(Cr) | 19.5 – 20.5 |
| ニッケル(Ni) | 17.5 – 18.5 |
| モリブデン(Mo) | 6.0 – 6.5 |
| 銅 | 0.5 – 1.0 |
| 窒素(N) | 0.18 – 0.22 |
| カーボン(C) | 0最大.020 |
| シリコン（Si） | 0.80 max |
| 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
1.4547/UNS S31254/F44/254 SMO exhibits excellent mechanical properties suitable for various applications:
| 財産 | 価値 |
|---|---|
| 引張強さ、ksi (MPa) | 100(690)分 |
| 降伏強さ (0.2% オフセット)、ksi (MPa) | 50(345)分 |
| 伸び (% 単位 2 インチ) | 35 min |
| 硬度、ロックウェル B (HRB) | 最大55 |
性能特性
1.4547/UNS S31254/F44/254 SMO offers outstanding performance across diverse conditions:
- 耐食性: Excellent resistance to both uniform corrosion and localized corrosion, including pitting and crevice corrosion, in chloride-containing environments.
- 高温強度: Maintains strength and toughness at elevated temperatures, suitable for applications in marine and chemical processing industries.
- 溶接性: Good weldability with conventional methods, such as TIG and MIG welding, ensuring ease of fabrication.
産業用途
1.4547/UNS S31254/F44/254 SMO is utilized in industries requiring robust corrosion resistance and high strength:
| 産業部門 | アプリケーション |
|---|---|
| 化学処理 | Heat exchangers, evaporators, and reactor tanks. |
| オイルとガス | Offshore platforms, pipelines, and valves in harsh environments. |
| マリン | Seawater desalination, marine exhaust systems, and shipbuilding. |
形状とサイズ
1.4547/UNS S31254/F44/254 SMO is available in various forms and sizes to meet specific application needs:
- フォーム: Sheets, plates, bars, tubes, pipes, fittings, and welding consumables.
- サイズ: Thickness ranging from 0.1 mm to 50 mm for plates, and diameter ranging from 6 mm to 300 mm for round bars.
製造基準
1.4547/UNS S31254/F44/254 SMO adheres to international production standards ensuring quality and performance:
| 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：0.1mm～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 A312, ASTM A358 |
溶接・加工
1.4547/UNS S31254/F44/254 SMO offers good weldability and processing characteristics:
- 溶接： 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.
長所と短所
| 側面 | 詳細 |
|---|---|
| 利点 | Exceptional corrosion resistance, high strength, excellent weldability, and suitability for critical applications in aggressive environments. |
| 短所 | Higher initial cost compared to standard stainless steels, requires expertise in handling and fabrication due to its high alloy content. |
類似の合金
| 合金名 | 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. |
類似合金の比較
| 性質・特徴 | 1.4547/UNS S31254/F44/254 SMO | 904L (UNS N08904) | Duplex Stainless Steel (UNS S31803) |
|---|---|---|---|
| クロム含有量 (%) | 19.5 – 20.5 | 20.0 – 25.0 | 21.0～23.0 |
| ニッケル含有量 (%) | 17.5 – 18.5 | 23.0 – 28.0 | 4.5 – 6.5 |
| モリブデン含有量 (%) | 6.0 – 6.5 | 4.0 – 5.0 | 2.5 – 3.5 |
| 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。 | 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. |
| アプリケーション | Chemical processing, oil and gas, marine environments. | 化学および製薬産業、製紙産業。 | 石油とガス、化学処理、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.