Cobalt Alloys HY ST31 / Stellite 31 / UNS R30031 Product Introduction
Cobalt alloys such as HY ST31 (Stellite 31) and UNS R30031 are renowned for their exceptional resistance to wear, corrosion, and high temperatures. This article provides a comprehensive introduction to these alloys, covering their chemical composition, mechanical properties, performance at different temperatures, industry applications, shapes and sizes, production standards, welding and processing capabilities, advantages and disadvantages, and comparisons with similar alloys.
Kimyasal bileşim
HY ST31 (Stellite 31) and UNS R30031 have a complex chemical composition designed to achieve their high-performance properties:
| Öğe | Kompozisyon (%) |
|---|---|
| Kobalt (Co) | 30.0 – 34.0 |
| Krom (Cr) | 27.0 – 31.0 |
| Volfram (W) | 12.0 – 15.0 |
| Nikel (Ni) | 3.0 – 5.0 |
| Demir (Fe) | 3,0 – 4,5 |
| Molibden (Mo) | 2.0 – 3.5 |
| Karbon (C) | 00,05 – 0,15 |
| Manganez (Mn) | Maksimum 1,0 |
| Silikon (Si) | Maksimum 1,0 |
| Fosfor (P) | 00,04 maksimum |
| Kükürt (S) | 00,04 maksimum |
Mekanik özellikler
HY ST31 (Stellite 31) and UNS R30031 exhibit excellent mechanical properties suitable for high-stress applications:
| Mülk | Değer |
|---|---|
| Çekme Dayanımı, ksi (MPa) | 135 (930) dk |
| Akma Dayanımı (%0,2 ofset), ksi (MPa) | 105 (725) min |
| Uzama (2 inç cinsinden) | 20 dakika |
| Sertlik, Rockwell C (HRC) | 38 – 44 |
Performans Özellikleri
These cobalt alloys offer outstanding performance in severe environments:
- Aşınma Direnci: Exceptional resistance to abrasion, erosion, and metal-to-metal wear, making them ideal for high-stress wear applications.
- Korozyon Direnci: Excellent resistance to oxidation and corrosion in high-temperature and corrosive environments, including acids and alkalis.
- Yüksek Sıcaklık Dayanımı: Maintains strength and hardness at elevated temperatures, up to approximately 1200°F (650°C).
Endüstri Uygulamaları
HY ST31 (Stellite 31) and UNS R30031 are utilized across various industries where durability and resistance to wear and corrosion are critical:
| Sanayi Sektörü | Uygulamalar |
|---|---|
| Havacılık | Turbine blades, combustion chambers, and high-temperature engine components. |
| Petrol ve Gaz | Valves, pump components, and drilling equipment exposed to abrasive and corrosive fluids. |
| Medical | Surgical instruments, prosthetic devices, and biomedical implants requiring wear and corrosion resistance. |
Şekiller ve boyutlar
These alloys are available in various forms and sizes to suit different applications:
- Formlar: Levhalar, levhalar, çubuklar, tüpler ve özel şekiller.
- Boyutlar: Kalınlığı 0,025 inç ila 1,000 inç (0,64 mm ila 25,4 mm) arasında değişirken çapı 0,25 inç ila 6,0 inç (6,35 mm ila 152,4 mm) arasında değişir.
Üretim Standartları
HY ST31 (Stellite 31) and UNS R30031 conform to industry standards ensuring quality and reliability:
| Ürün Formu | Mevcut Şekiller | Mevcut Boyutlar | Üretim Standartları |
|---|---|---|---|
| Çubuklar/Çubuklar | Yuvarlak çubuklar, kare çubuklar | Çap: 0,25″ – 6,0″ (6,35mm – 152,4mm) | ASTM A732, AMS 5759 |
| Plakalar/Levhalar | Plakalar, Çarşaflar | Kalınlık: 0,025″ – 1,000″ (0,64mm – 25,4mm) | ASTM A732, AMS 5537 |
| Teller | Teller | Çap: 0,010″ – 0,250″ (0,25mm – 6,35mm) | ASTM A580, AMS 5832 |
| Tüpler/Borular | Tüpler, Borular | Dış Çap: 0,250″ – 6,000″ (6,35mm – 152,4mm) | ASTM A732, AMS 5759 |
Kaynak ve İşleme
HY ST31 (Stellite 31) and UNS R30031 offer good weldability and machinability:
- Kaynak: Uygun ön ısıtma ve kaynak sonrası ısıl işlemle TIG ve MIG kaynağı gibi standart yöntemler kullanılarak kaynak yapılabilir.
- İşleme: Machinable using carbide tools, although care is needed due to their high hardness and toughness.
Avantajlar ve dezavantajlar
| Bakış açısı | Detaylar |
|---|---|
| Avantajları | High wear resistance, excellent strength at elevated temperatures, good corrosion resistance, and versatility in various applications. |
| Dezavantajları | Higher cost compared to conventional materials, requires expertise in handling due to their high strength and hardness. |
Benzer Alaşımlar
| Alaşım Adı | Karşılaştırmak |
|---|---|
| Cobalt Alloy 6 | Higher cobalt content, offering superior wear resistance and hardness compared to HY ST31 and UNS R30031. |
Benzer Alaşımların Karşılaştırılması
| Özellik/Özellik | HY ST31 / UNS R30031 | Cobalt Alloy 6 |
|---|---|---|
| Kobalt İçeriği (%) | 30.0 – 34.0 | 54.0 – 62.0 |
| Krom İçeriği (%) | 27.0 – 31.0 | 25.0 – 32.0 |
| Tungsten İçeriği (%) | 12.0 – 15.0 | 8.0 – 10.0 |
| Sertlik, Rockwell C (HRC) | 38 – 44 | 48 – 55 |
| Uygulamalar | Aerospace, Oil & Gas, Medical | Endüstriyel aletler, aşınma bileşenleri |
This detailed article provides a comprehensive introduction to HY ST31 (Stellite 31) and UNS R30031, highlighting their 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 durable materials for high-wear and corrosion-resistant applications will find this information valuable for selecting the appropriate alloy to meet their specific needs.