Monel K500

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Product Overview

Om Export India Pvt Ltd is a leading manufacturer, stockist, and global exporter of high-strength Monel K500 Products (UNS N05500 / Werkstoff 2.4375 / Alloy K-500). Monel K500 is a precipitation-hardenable nickel-copper alloy that combines the excellent corrosion resistance of Monel 400 with substantially greater mechanical strength and hardness. This enhanced performance is achieved by adding Aluminum (2.30%–3.15%) and Titanium (0.35%–0.85%) to the high-nickel matrix, creating submicroscopic gamma prime (Ni3(Al,Ti)) precipitates during controlled age-hardening heat treatments.

Our Monel K500 product line includes cold-drawn precision ground bars, centreless ground pump shafts, heavy open-die forgings, age-hardened high-tensile fasteners, and custom flanges conforming to ASTM B865, AMS 4676, and NACE MR0175/ISO 15156 standards. Monel K500 is virtually non-magnetic across a broad temperature range (down to cryogenic temperatures) and provides exceptional resistance to high-velocity seawater erosion, sour oilfield media (H2S), and aggressive chemical process streams.

Age-Hardened Strength: Delivers approximately double the tensile strength and triple the yield strength of standard Monel 400 (Yield Strength ≥ 790 MPa / 115 ksi).
Non-Magnetic Stability: Remains completely non-magnetic down to -100°C (-148°F) with high dimensional stability and low magnetic permeability (μ < 1.002).
Sour Service Compliance: Fully certified per NACE MR0175 / ISO 15156 for downhole drilling tools, drill collars, and offshore wellhead components.

Key Features

Precipitation Hardening: Yield strength exceeding 790 MPa (115 ksi) and tensile strength up to 1100 MPa (160 ksi).
Non-Magnetic Property: Retains non-magnetic characteristics across cryogenic to elevated service temperatures.
Seawater Erosion-Corrosion Resistance: Resistant to high-velocity seawater, cavitation, and marine biofouling.
Sour Service Durability: Conforms to NACE MR0175 hardness and heat-treatment requirements for H2S sour gas extraction.
Fatigue & Wear Resistance: High cyclic fatigue strength and galling resistance in rotating shaft and pump operations.
Dimensional Precision: Precision ground round bars with ISO h8/h9 tolerances and superior straightness for dynamic applications.

Product Specifications

Specification Parameter	Standard Specification / Technical Value
Material Grade & Designation	Monel K500 / Alloy K-500 / UNS N05500 / W.Nr. 2.4375
Governing Standards	ASTM B865, ASME SB865, AMS 4676, BS 3076 NA 18, DIN 17752, ISO 9723
Round Bar & Rod Size Range	3.0 mm to 600.0 mm Diameter (1/8" to 24" OD / M6 to M64 Metric)
Fasteners & Bolting Range	M6 to M100 / 1/4" to 4" (Heavy Hex Bolts, Stud Bolts, Hex Nuts, Socket Head Cap Screws)
Flange Size & Class Range	1/2" NB to 24" NB (Class 150# up to 2500# per ASME B16.5)
Heat Treatment Delivery State	Hot Finished, Hot Finished & Age Hardened, Cold Drawn, Cold Drawn & Age Hardened (Aged at 580°C–600°C)
Surface Finishes	Bright Polished, Centreless Ground (PSQ h8/h9), Rough Turned, Black Forged, Pickled
Quality Certifications	EN 10204 Type 3.1 & 3.2, NACE MR0175 / ISO 15156, AS 9100D, 100% PMI Spectro

Dimensions & Sizes

Nominal Diameter (mm / in.)	Cross-Section Area (mm²)	Weight per Meter (kg/m)	Weight per Foot (lb/ft)	Available Standard Lengths
6.0 mm (0.236")	28.27 mm²	0.24 kg/m	0.16 lb/ft	1000 mm to 3000 mm
10.0 mm (0.394")	78.54 mm²	0.66 kg/m	0.44 lb/ft	3000 mm / 10 ft
12.7 mm (1/2" / 0.500")	126.68 mm²	1.07 kg/m	0.72 lb/ft	3000 mm / 6000 mm
16.0 mm (0.630")	201.06 mm²	1.70 kg/m	1.14 lb/ft	3000 mm / 6000 mm
19.05 mm (3/4" / 0.750")	285.02 mm²	2.41 kg/m	1.62 lb/ft	3000 mm / 6000 mm
25.4 mm (1" / 1.000")	506.71 mm²	4.28 kg/m	2.88 lb/ft	3000 mm / 6000 mm
31.75 mm (1-1/4" / 1.250")	791.73 mm²	6.68 kg/m	4.49 lb/ft	3000 mm / 6000 mm
38.1 mm (1-1/2" / 1.500")	1140.09 mm²	9.62 kg/m	6.47 lb/ft	3000 mm / 6000 mm
50.8 mm (2" / 2.000")	2026.83 mm²	17.11 kg/m	11.50 lb/ft	3000 mm / 6000 mm
63.5 mm (2-1/2" / 2.500")	3166.92 mm²	26.73 kg/m	17.96 lb/ft	3000 mm / 6000 mm
76.2 mm (3" / 3.000")	4560.37 mm²	38.49 kg/m	25.87 lb/ft	3000 mm / 6000 mm
88.9 mm (3-1/2" / 3.500")	6207.17 mm²	52.39 kg/m	35.21 lb/ft	3000 mm / 6000 mm
101.6 mm (4" / 4.000")	8107.32 mm²	68.43 kg/m	45.99 lb/ft	3000 mm / 6000 mm
127.0 mm (5" / 5.000")	12667.69 mm²	106.92 kg/m	71.85 lb/ft	2000 mm to 6000 mm
152.4 mm (6" / 6.000")	18241.47 mm²	153.96 kg/m	103.47 lb/ft	2000 mm to 6000 mm
203.2 mm (8" / 8.000")	32429.28 mm²	273.70 kg/m	183.94 lb/ft	1000 mm to 4000 mm
254.0 mm (10" / 10.000")	50670.75 mm²	427.66 kg/m	287.41 lb/ft	1000 mm to 3000 mm

Chemical Composition

Element	ASTM B865 / UNS N05500 (%)	Werkstoff 2.4375 / NiCu30Al (%)
Nickel (Ni + Co)	63.00 Min	63.00 Min
Copper (Cu)	27.00 – 33.00	27.00 – 33.00
Aluminum (Al)	2.30 – 3.15	2.30 – 3.15
Titanium (Ti)	0.35 – 0.85	0.35 – 0.85
Iron (Fe)	0.50 – 2.00	0.50 – 2.00
Manganese (Mn, Max)	1.50	1.50
Carbon (C, Max)	0.25 (Standard ≤ 0.18)	0.18
Silicon (Si, Max)	0.50	0.50
Sulfur (S, Max)	0.010	0.010

Mechanical Properties

Material Condition / Form	Tensile Strength (MPa / ksi)	Yield Strength 0.2% Offset (MPa / ksi)	Elongation in 2 in. (%)	Hardness (Rockwell / Brinell)
Hot Finished & Age-Hardened	965 – 1100 MPa (140 – 160 ksi)	690 – 790 MPa (100 – 115 ksi)	20% – 30%	27 – 35 HRC (265 – 327 HBW)
Cold Drawn & Age-Hardened	1100 – 1300 MPa (160 – 188 ksi)	790 – 1000 MPa (115 – 145 ksi)	15% – 25%	32 – 40 HRC (300 – 375 HBW)
Hot Finished / Annealed (Un-aged)	620 – 760 MPa (90 – 110 ksi)	275 – 415 MPa (40 – 60 ksi)	35% – 50%	75 – 90 HRB (140 – 185 HBW)
Physical Density & Melting Point	Density: 8.44 g/cm³ (0.305 lb/in³)	Melting Point: 1350°C (2460°F)		Modulus of Elasticity: 179 kN/mm² (26 x 10⁶ psi)

Standards & Specifications

Governing Organization	Standard Designation	Scope & Product Type
ASTM / ASME	ASTM B865 / ASME SB865	Standard Specification for Precipitation-Hardening Nickel-Copper Alloy (UNS N05500) Bar, Rod, and Forgings
Aerospace Material Spec	AMS 4676	Nickel-Copper Alloy Bars and Forgings, Precipitation Heat Treated (Monel K-500)
Federal Specification	QQ-N-286	Nickel-Copper-Aluminum Alloy, Wrought (Monel K500 Class A & B)
British Standard (BS)	BS 3076 (NA 18)	Specification for Nickel and Nickel Alloys: Bars, Rods, and Sections
German Standard (DIN)	DIN 17752 / DIN 17754 (W.Nr. 2.4375)	Wrought Nickel and Nickel-Copper Alloy Rods, Bars, and Forgings (NiCu30Al)
Oil & Gas Standard	NACE MR0175 / ISO 15156	Petroleum and Natural Gas Industries — Materials for use in H2S-containing environments

Applications

Monel K500 age-hardened components are deployed across high-stress marine, oilfield drilling, and aerospace applications:

Oil & Gas Drilling & Extraction: Non-magnetic drill collars, downhole measurement-while-drilling (MWD) tool housings, sour gas wellhead components, valve trim, and safety relief springs.
Marine Propulsion & Hardware: High-strength pump and propeller shafts, rudder stocks, marine fasteners, centrifugal pump sleeves, and submarine periscope hardware.
Chemical Processing Equipment: High-pressure mixing impellers, valve stems, doctor blades for paper manufacturing, scraper blades, and centrifuge shafts.
Sensors & Electronic Hardware: Non-magnetic instrumentation housings, gyroscopic components, and electronic shielding enclosures.
Aerospace & Defense: High-tensile airframe fasteners, landing gear locking pins, and actuator components exposed to marine atmospheres.

Frequently Asked Questions

Q1: What is the primary difference between Monel 400 and Monel K500?
While both alloys share the same core nickel-copper base, Monel K500 contains added Aluminum (2.3%–3.15%) and Titanium (0.35%–0.85%). Through precipitation aging, Monel K500 achieves nearly triple the yield strength and double the tensile strength of Monel 400 while retaining comparable marine corrosion resistance.

Q2: How is the precipitation hardening process performed on Monel K500?
After solution annealing at 980°C–1040°C followed by water quenching, the material is aged by holding it at 580°C–600°C (1075°F–1110°F) for approximately 16 hours, followed by controlled furnace cooling down to 480°C. This precipitates microscopic gamma prime (Ni3(Al,Ti)) particles throughout the matrix.

Q3: Is Monel K500 magnetic?
Monel K500 is completely non-magnetic down to -100°C (-148°F) in the aged condition, with a magnetic permeability (μ) of less than 1.002, making it the premier material for directional drilling MWD tools and non-magnetic subsea equipment.

Q4: What certifications accompany Monel K500 orders from Om Export India Pvt Ltd?
Every order is supplied with an EN 10204 3.1 / 3.2 inspection certificate verifying chemical composition, tensile and yield strength, elongation, Rockwell C hardness, 100% Ultrasonic Testing (UT), and NACE MR0175 / ISO 15156 compliance.