Introduction

Alloy 600 is a nickel-chromium-iron solid solution strengthened alloy with a nominal chemical composition of 72% nickel, 16% chromium, and 8% iron. It is commonly referred to by the tradename Inconel® 600 and the universal designation UNS N06600. Alloy 600 offers good corrosion resistance in many media with superior oxidation resistance at elevated temperatures.

CHARACTERISTICS

CORROSION RESISTANCE

Alloy 600 has outstanding corrosion resistance imparted by the dual corrosion fighting power of chromium and nickel. Chromium resists corrosion from oxidizing media while nickel defends against attack from many reducing agents. Alloy 600 exhibits good corrosion resistance in reducing acids, mildly oxidizing acids, high purity water, and other media. However, Alloy 600 is not suitable for strong oxidizing acids such as hot nitric acid. It is essentially immune to chloride stress corrosion cracking.
Service Temperature

ELEVATED TEMPERATURE RESISTANCE

Alloy 600 provides excellent oxidation resistance at temperatures up to 2150°F (1177°C). However, it is susceptible to sulfidation attack.
Mechanical Properties

MECHANICAL PROPERTIES

Alloy 600 can be provided in the lower strength, annealed condition, or strengthened through the pilger process. Alloy 600 maintains excellent toughness even in the higher strength conditions and maintains toughness at cryogenic temperatures.
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HEAT TREATMENT

While Alloy 400 cannot be strengthened by heat treating, annealing or stress relieving are commonly used after hot working or cold working operations. Stress-relieving is conducted at 1400°F - 1600°F (760°C - 871°C). Stress-relieving is performed after cold working to reduce residual stress and prevent distortion. Annealing is performed at 1700°F - 1900°F (927°C - 1038°C) to restore full softness.

WORKABILITY

Alloy 600 has good hot and cold workability in the annealed condition. Hot-working should be done above 1600°F (871°C) to ensure adequate ductility, while cold work should be performed below 1200°F (649°C).

APPLICATIONS

Alloy 600 is a versatile alloy used in many different applications, including the chemical process industry, aerospace, food processing, electronics, oil and gas, and nuclear power generation. Its elevated temperature oxidation resistance makes it a good choice for heat-treating fixtures, furnaces, incinerators, and other high-temperature equipment. CRA offers specialty alloy 600 seamless pipe & tube for use in multiple industries and applications, including: