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UNS R30605 High-Temperature Alloy Specification

UNS R30605 is a high-performance nickel-based alloy designed for extreme environments, particularly those involving high temperatures and corrosive conditions. This alloy is part of the Hastelloy family, known for its exceptional resistance to oxidation, carburization, and thermal fatigue. Below, we delve into the key specifications, properties, and applications of UNS R30605.

Chemical Composition

The chemical composition of UNS R30605 is critical to its performance. The alloy primarily consists of nickel (Ni) as the base element, with significant additions of chromium (Cr), iron (Fe), and molybdenum (Mo). Below is a breakdown of its typical composition:

• Nickel (Ni): 58% minimum
• Chromium (Cr): 20-23%
• Iron (Fe): 5% maximum
• Molybdenum (Mo): 8-10%
• Cobalt (Co): 2.5% maximum
• Tungsten (W): 0.2-1.0%
• Carbon (C): 0.05-0.15%
• Silicon (Si): 1.0% maximum
• Manganese (Mn): 1.0% maximum

Mechanical Properties

UNS R30605 exhibits excellent mechanical properties, making it suitable for high-stress applications. Some of its key mechanical characteristics include:

• Tensile Strength: 690 MPa (100 ksi) minimum
• Yield Strength: 310 MPa (45 ksi) minimum
• Elongation: 30% minimum
• Hardness: 200 HB maximum

High-Temperature Performance

One of the standout features of UNS R30605 is its ability to maintain structural integrity at elevated temperatures. The alloy can operate continuously at temperatures up to 1200°C (2192°F) without significant degradation. Its resistance to oxidation and carburization makes it ideal for applications such as:

• Furnace components
• Heat exchangers
• Gas turbine components
• Chemical processing equipment

Corrosion Resistance

UNS R30605 offers superior resistance to a wide range of corrosive environments, including sulfuric acid, hydrochloric acid, and phosphoric acid. Its high chromium and molybdenum content provide excellent protection against pitting and crevice corrosion. This makes it a preferred material for:

• Petrochemical industry equipment
• Waste incineration systems
• Marine applications

Fabrication and Welding

Despite its high strength, UNS R30605 can be fabricated using conventional methods. However, care must be taken to avoid contamination during welding. Recommended welding techniques include:

• Gas