Haynes® 188 (Alloy 188) UNS R30188 Product Introduction
Haynes® 188, also known as Alloy 188 and designated as UNS R30188, is a cobalt-based superalloy renowned for its excellent high-temperature strength, oxidation resistance, and fabricability. This article provides a comprehensive introduction to Haynes® 188, 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
Haynes® 188 is primarily composed of cobalt with significant additions of chromium, tungsten, nickel, and other elements to enhance its mechanical and thermal properties:
| 要素 | 構成 （％） |
|---|---|
| コバルト(Co) | 39.0 – 41.0 |
| クロム(Cr) | 20.0 – 24.0 |
| ニッケル(Ni) | 20.0 – 24.0 |
| タングステン(W) | 13.0 – 15.0 |
| 鉄(Fe) | 最大3.0 |
| モリブデン(Mo) | 2.0 – 3.0 |
| マンガン(Mn) | 最大1.0 |
| シリコン（Si） | 0最大.5 |
| カーボン(C) | 0.05 – 0.15 |
| ホウ素(B) | 0.01 – 0.05 |
機械的性質
Haynes® 188 exhibits exceptional mechanical properties suitable for high-temperature applications:
| 財産 | 価値 |
|---|---|
| 引張強さ、ksi (MPa) | 130 – 150 (896 – 1034) |
| 降伏強さ (0.2% オフセット)、ksi (MPa) | 65 – 75 (448 – 517) |
| 伸び (% 単位 2 インチ) | 20 – 30 |
| 硬度、ロックウェル C (HRC) | 34 – 40 |
性能特性
Haynes® 188 offers several performance advantages:
- 高温強度: Maintains excellent mechanical properties at temperatures up to 1093°C (2000°F), making it suitable for gas turbine engine components, such as turbine blades, combustors, and afterburners.
- 耐酸化性: Exhibits superior resistance to oxidation and corrosion in high-temperature environments, extending component lifetimes.
- Fabricability: Provides good weldability and formability, allowing for complex shapes and configurations.
産業用途
Haynes® 188 is widely used in industries where high strength and corrosion resistance at elevated temperatures are critical:
| 産業部門 | アプリケーション |
|---|---|
| 航空宇宙 | Gas turbine components, including blades, combustors, and transition ducts. |
| 発電 | Turbine hot-section components, heat exchangers, and industrial furnace parts. |
| 化学処理 | High-temperature reactors, catalyst grid supports, and combustion chamber linings. |
形状とサイズ
Haynes® 188 is available in various forms and sizes to meet specific application needs:
- フォーム: 板、板、棒、鍛造品、線材。
- サイズ: 板厚は0.5mm～100mm、丸棒は直径1mm～300mmまで対応可能です。
製造基準
Haynes® 188 conforms 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～100mm | ASTM B435, AMS 5608 |
| バー/ロッド | 丸棒、角棒 | 直径：1mm～300mm | ASTM B572, AMS 5608 |
| 鍛造品 | ブロック、ディスク、リング | サイズ: カスタマイズされた | ASTM B637, AMS 5772 |
溶接・加工
Haynes® 188 offers good weldability and processing characteristics:
- 溶接： TIG、MIG、抵抗溶接などの溶接方法が可能です。特性を維持するには、予熱および溶接後の熱処理が必要な場合があります。
- 機械加工性: 通常、超硬工具と適切な切削液を使用して溶体化処理された状態で機械加工されます。
長所と短所
| 側面 | 詳細 |
|---|---|
| 利点 | Excellent high-temperature strength and oxidation resistance, good fabricability and weldability, and long service life in aggressive environments. |
| 短所 | Higher cost compared to standard materials, requires specialized processing and handling due to its high strength and alloying elements. |
類似合金との比較
Haynes® 188 (UNS R30188) is often compared with other cobalt-based superalloys such as Haynes® 25 and Haynes® 230. Here’s a brief comparison:
| 合金の種類/特性 | Haynes® 188 | Haynes® 25 | Haynes® 230 |
|---|---|---|---|
| 化学組成 | Cobalt, chromium, nickel, tungsten, molybdenum for high-temperature strength and oxidation resistance. | Cobalt, chromium, nickel, tungsten, molybdenum for high-temperature strength and oxidation resistance. | Cobalt, chromium, nickel, tungsten, molybdenum for high-temperature strength and oxidation resistance. |
| 機械的性質 | High tensile and yield strength, good ductility and formability. | Similar tensile and yield strength, good resistance to thermal fatigue and oxidation. | Higher tensile and yield strength compared to Haynes® 188, excellent thermal stability and corrosion resistance. |
| アプリケーション | Gas turbine components, aerospace hot-section parts, industrial furnace components. | Aerospace components, gas turbine combustors, industrial furnace parts. | Aerospace and industrial gas turbine components requiring high-temperature strength and corrosion resistance. |
This detailed article introduces Haynes® 188 (Alloy 188, UNS R30188), 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 a reliable, high-temperature superalloy for demanding applications in aerospace, power generation, and chemical processing will find Haynes® 188 well-suited for use in extreme environments.