Inconel 625LCF Introduction

Solid Solution
Strengthened Alloy

Nickel

Chromium

Molybdenum

Niobium

Corrosion
Resistance

89

Mechanical
Behavior

71

Purity

94

Overview

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INCONEL® alloy 625LCF (UNS N06626 / W. Nr. 2.4856) was developed as a fatigue-resistant, bellows-quality version of INCONEL alloy 625. Alloying, melting and processing are designed and controlled to provide a sheet product with optimum resistance to low-cycle and thermal fatigue at up to 1200°F (650°C). The alloy offers a high level of performance in aircraft exhaust and automotive flexible coupling bellows, expansion joints in process or transport piping, and other applications involving resistance to low-cycle or thermal fatigue.

Mechanical Properties

INCONEL alloy 625LCF has an average grain size of ASTM No. 5 (0.0025 in/0.064 mm) or finer. The outstanding characteristic of this alloy is its low-cycle fatigue strength derived primarily from controlled microstructure, grain size and yield strength.

The same factors that enhance resistance to mechanical fatigue also improve resistance to thermal fatigue. The alloy, like alloy 625, undergoes a microstructural phase formation during long-time exposure to intermediate elevated temperatures. Such exposure can increase the strength of the alloy while lowering ductility and impact properties. Because of the phase formation, with the unfavorable effect of fine grain on creep-rupture properties, INCONEL alloy 625LCF is not recommended for extended use at high stress levels above 1200°F (650°C).

Corrosion Resistance

INCONEL alloy 625LCF (UNS N06626) has the same excellent corrosion resistance as INCONEL alloy 625 (UNS N06625). In mild environments such as the atmosphere, fresh and sea water, neutral salts and alkaline media, the alloy is virtually unaffected.

In more severe environments, the combination of nickel and chromium provides resistance to oxidizing chemicals and atmospheres, and the high nickel and molybdenum supply resistance to non-oxidating environments.

Physical Properties

Mechanical Properties