Stainless Steel Grade UNS R30605: Properties and Applications

# Stainless Steel Grade UNS R30605: Properties and Applications

## Introduction to UNS R30605

Stainless steel grade UNS R30605, also known as Alloy 600, is a nickel-chromium alloy that offers excellent resistance to high temperatures and corrosion. This material is widely used in various industries due to its unique combination of mechanical properties and chemical resistance.

## Chemical Composition

The chemical composition of UNS R30605 plays a crucial role in its performance characteristics:

Nickel (Ni): 72% minimum

Chromium (Cr): 14-17%

Iron (Fe): 6-10%

Carbon (C): 0.15% maximum

Manganese (Mn): 1.0% maximum

Sulfur (S): 0.015% maximum

Silicon (Si): 0.5% maximum

Copper (Cu): 0.5% maximum

## Mechanical Properties

Keyword: uns r30605

UNS R30605 exhibits impressive mechanical properties that make it suitable for demanding applications:

Tensile Strength

Room temperature: 550-760 MPa

Elevated temperature: Maintains strength up to 1093°C (2000°F)

Yield Strength

Room temperature: 240-550 MPa

Elongation

30-55% in 50 mm (2 in.)

## Physical Properties

Density: 8.47 g/cm³ (0.306 lb/in³)

Melting Range: 1354-1413°C (2470-2580°F)

Thermal Conductivity: 14.9 W/m·K at 100°C

Electrical Resistivity: 1.03 μΩ·m at 20°C

## Corrosion Resistance

UNS R30605 offers excellent resistance to:

– Oxidation at high temperatures

– Chloride stress corrosion cracking

– Corrosion by hot gases

– Many organic and inorganic compounds

## Heat Treatment

The alloy can be annealed at temperatures between 871-982°C (1600-1800°F) followed by rapid cooling to achieve optimal properties.

## Applications

Aerospace Industry

Used in jet engine components, exhaust systems, and combustion chambers

Chemical Processing

Ideal for heat exchangers, reaction vessels, and piping systems

Nuclear Power

Employed in steam generator tubing and reactor components

Heat Treating

Used for furnace muffles, retorts, and baskets

Food Processing

Suitable for equipment handling corrosive food products

## Fabrication and Welding

UNS R30605 can be fabricated using standard techniques:

– Hot working between 871-1177°C (1600-2150°F)

– Cold working with intermediate annealing

– Welding using matching filler metals (ERNiCr-3)

## Advantages Over Other Alloys

1. Superior resistance to chloride stress corrosion cracking compared to 300 series stainless steels

2. Better high-temperature strength than most austenitic stainless steels

3. Excellent resistance to oxidation and carburization

4. Good mechanical properties maintained over a wide temperature range</p

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