Standard Mechanical Property Values of 400 monel - Knowledge

1. Core Mechanical Property Indicators (Room Temperature)

The mechanical properties of Monel 400 in the annealed state (the most common state for industrial applications) are the benchmark for engineering selection, with the following standard values:

Mechanical Property Index	Standard Value	Test Standard
Tensile Strength	480–650 MPa	ASTM E8/E8M
Yield Strength (0.2% offset)	≥ 170 MPa	ASTM E8/E8M
Elongation at Break	≥ 35%	ASTM E8/E8M
Reduction of Area	≥ 60%	ASTM E8/E8M
Brinell Hardness (HB)	110–160 HB	ASTM E10

Notes on Property Values

For cold-worked Monel 400 (e.g., cold-rolled plates, cold-drawn bars), the tensile and yield strengths will increase significantly with the degree of cold working, while ductility will decrease. For example:

When the cold working rate reaches 30%, the tensile strength can rise to 750–850 MPa, the yield strength can exceed 550 MPa, but the elongation at break will drop to 10–15%.

For welded Monel 400 components, the mechanical properties of the weld zone are slightly lower than the base metal. The tensile strength of the weld zone is generally 450–580 MPa, and the elongation is ≥ 25%.

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2. Influence of Temperature on Mechanical Properties

Monel 400 maintains stable mechanical properties in a wide temperature range (-200°C to 400°C), which is one of its core advantages for low-temperature and medium-temperature applications:

Low-Temperature Performance

At cryogenic temperatures (e.g., -196°C, liquid nitrogen temperature), Monel 400 does not experience embrittlement. Its tensile strength increases to 600–700 MPa, yield strength to ≥ 250 MPa, and elongation at break remains above 30%. This makes it suitable for low-temperature equipment such as liquefied gas storage tanks and cryogenic pipelines.

Medium-High Temperature Performance

When the temperature is below 400°C, the tensile strength of Monel 400 decreases slightly (about 5–10% lower than room temperature values). When the temperature exceeds 400°C, its strength drops sharply, and creep deformation is prone to occur under stress, so it is not recommended for long-term service in high-temperature environments above 400°C.

3. Compliance Requirements for Mechanical Properties

To ensure product quality, Monel 400 products must pass mechanical property tests before leaving the factory:

Tensile tests are required to verify tensile strength, yield strength, and elongation.

For products used in low-temperature or dynamic load scenarios, impact toughness tests (ASTM E23) are also required. The Charpy V-notch impact energy of annealed Monel 400 at room temperature is ≥ 180 J.