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.
화학적 구성 요소
HY ST31 (Stellite 31) and UNS R30031 have a complex chemical composition designed to achieve their high-performance properties:
| 요소 | 구성 (%) |
|---|---|
| 코발트(Co) | 30.0 – 34.0 |
| 크롬(Cr) | 27.0 – 31.0 |
| 텅스텐(W) | 12.0 – 15.0 |
| 니켈(Ni) | 3.0 – 5.0 |
| 철(Fe) | 3.0 – 4.5 |
| 몰리브덴(Mo) | 2.0 – 3.5 |
| 탄소(C) | 0.05 – 0.15 |
| 망간(Mn) | 최대 1.0 |
| 실리콘(Si) | 최대 1.0 |
| 인(P) | 00.04 최대 |
| 유황(S) | 00.04 최대 |
기계적 성질
HY ST31 (Stellite 31) and UNS R30031 exhibit excellent mechanical properties suitable for high-stress applications:
| 재산 | 값 |
|---|---|
| 인장 강도, ksi(MPa) | 135(930)분 |
| 항복 강도(0.2% 오프셋), ksi(MPa) | 105(725)분 |
| 신율(2인치 단위의 %) | 20분 |
| 경도, 로크웰 C(HRC) | 38 – 44 |
성능 특성
These cobalt alloys offer outstanding performance in severe environments:
- 내마모성: Exceptional resistance to abrasion, erosion, and metal-to-metal wear, making them ideal for high-stress wear applications.
- 부식 저항: Excellent resistance to oxidation and corrosion in high-temperature and corrosive environments, including acids and alkalis.
- 고온 강도: Maintains strength and hardness at elevated temperatures, up to approximately 1200°F (650°C).
산업 응용
HY ST31 (Stellite 31) and UNS R30031 are utilized across various industries where durability and resistance to wear and corrosion are critical:
| 산업 분야 | 애플리케이션 |
|---|---|
| 항공우주 | Turbine blades, combustion chambers, and high-temperature engine components. |
| 석유 및 가스 | 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. |
모양과 크기
These alloys are available in various forms and sizes to suit different applications:
- 양식: 시트, 플레이트, 바, 튜브 및 사용자 정의 모양.
- 크기: 두께 범위는 0.025인치 ~ 1.000인치(0.64mm ~ 25.4mm)이고 직경 범위는 0.25인치 ~ 6.0인치(6.35mm ~ 152.4mm)입니다.
생산 표준
HY ST31 (Stellite 31) and UNS R30031 conform to industry standards ensuring quality and reliability:
| 제품 형태 | 사용 가능한 모양 | 사용 가능한 크기 | 생산 표준 |
|---|---|---|---|
| 바/막대 | 둥근 막대, 사각형 막대 | 직경: 0.25″ – 6.0″ (6.35mm – 152.4mm) | ASTM A732, AMS 5759 |
| 플레이트/시트 | 플레이트, 시트 | 두께: 0.025″ – 1.000″ (0.64mm – 25.4mm) | ASTM A732, AMS 5537 |
| 전선 | 전선 | 직경: 0.010″ – 0.250″ (0.25mm – 6.35mm) | ASTM A580, AMS 5832 |
| 튜브/파이프 | 튜브, 파이프 | 외경: 0.250″ – 6.000″ (6.35mm – 152.4mm) | ASTM A732, AMS 5759 |
용접 및 가공
HY ST31 (Stellite 31) and UNS R30031 offer good weldability and machinability:
- 용접: 적절한 예열 및 용접 후 열처리를 통해 TIG 및 MIG 용접과 같은 표준 방법을 사용하여 용접할 수 있습니다.
- 처리: Machinable using carbide tools, although care is needed due to their high hardness and toughness.
장점과 단점
| 측면 | 세부 |
|---|---|
| 장점 | High wear resistance, excellent strength at elevated temperatures, good corrosion resistance, and versatility in various applications. |
| 단점 | Higher cost compared to conventional materials, requires expertise in handling due to their high strength and hardness. |
유사한 합금
| 합금 이름 | 비교 |
|---|---|
| Cobalt Alloy 6 | Higher cobalt content, offering superior wear resistance and hardness compared to HY ST31 and UNS R30031. |
유사한 합금의 비교
| 속성/특징 | HY ST31 / UNS R30031 | Cobalt Alloy 6 |
|---|---|---|
| 코발트 함량(%) | 30.0 – 34.0 | 54.0 – 62.0 |
| 크롬 함량(%) | 27.0 – 31.0 | 25.0 – 32.0 |
| 텅스텐 함량(%) | 12.0 – 15.0 | 8.0 – 10.0 |
| 경도, 로크웰 C(HRC) | 38 – 44 | 48 – 55 |
| 애플리케이션 | Aerospace, Oil & Gas, Medical | 산업용 공구, 마모 부품 |
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.