MONEL K500

Monel K500 Age-Hardened Ni-Cu Bar

Upgraded 400 · First choice for heavily loaded seawater shaft parts

Al/Ti additions age-harden the 400 base via γ′ precipitates, delivering roughly 3× the yield strength of annealed 400 while retaining 400-class seawater corrosion resistance.

Technical Data

Material category: Ni-Cu Precipitation-Hardening Alloy
Specification: ASTM B865
Delivery condition: Cold-drawn + Aged
UNS: N05500
W.Nr.: 2.4375
Specification: Monel K500 / UNS N05500

Mechanical Properties

Tensile Rm	≥ 1138 MPa
Yield Rp0.2	≥ 897 MPa
Elongation A	≥ 18 %
Reduction of Area	25 – 50 %
Hardness	≤ 40 HRC
Service Temp.	-100 ~ 480 °C
Density	8.44 g/cm³
Condition	Cold-drawn + Aged

Chemical Composition

Values in wt%, balance is the base element.

Nickel Ni	≥ 63.0
Copper Cu	27.0 – 33.0
Aluminium Al	2.50 – 3.15
Titanium Ti	0.35 – 0.85
Manganese Mn	≤ 1.5
Iron Fe	≤ 2.0
Carbon C	≤ 0.25
Silicon Si	≤ 0.50
Sulfur S	≤ 0.010

Technical Data

Tensile strength Rm: 1138 MPa
Yield strength Rp0.2: 897 MPa
Elongation A: 18 %
Reduction of area Z: 25 – 50 % %
Hardness: ≤ 40 HRC
Service temperature: -100 ~ 480 ℃
Density: 8.44 g/cm³

Material Characteristics

Al/Ti ageing forms γ′ precipitates — about 3× the yield strength of annealed 400
Ni ≥63.0% with Cu 27.0-33.0% retains 400-class corrosion resistance at much higher strength
Al 2.50-3.15% / Ti 0.35-0.85% towards the upper limits raise yield — several strength levels on request
Weakly magnetic when aged; confirm heat treatment for stagnant seawater or HF service

Typical Applications

High-strength seawater shaft partsValve stemsDrill collarsMarine fasteners

Inspection & Certification

UT to ASTM A388/A388M-2023, acceptance class AMS-STD-2154E, 0.8 mm FBH sensitivity (immersion line-focus probe); surface and dimensional inspection before release; EN 10204 3.1 certificate (3.2 available) with each lot.