ASTM B163 · B165 · QQ-N-286
Monel K500
Seamless Pipe
UNS N05500 · W.Nr. 2.4375 — precipitation-hardened nickel-copper alloy with tripled yield strength vs. Monel 400. Engineered engineered for marine, oil & gas, and chemical processing.
Tensile (aged): ≥ 1100 MPa
⚙️ Hardness: 26–32 HRC
Density: 8.44 g/cm³
Premium Manufacturer
LTDPIPELINE
Hebei, China · EN 10204 3.1
Verified Heavy Industrial Supplier
ℹ️
What is Monel K500 Seamless Pipe?
Seamless Monel K500 Pipe (UNS N05500) is a high-performance nickel-copper alloy pipe known for its exceptional strength, corrosion resistance, and reliability in extreme environments. Unlike Monel 400, Monel K500 is an age-hardenable alloy. Through the addition of controlled amounts of aluminum (Al) and titanium (Ti), the material undergoes precipitation hardening, significantly increasing its mechanical strength. XinZhe manufactures seamless K500 piping that strictly complies with ASTM B163, ASTM B165, and QQ-N-286, delivering optimal dimensional tolerance and maximum resistance to stress-corrosion cracking in sour-gas environments.
Hardening Type
Precipitation
Density Metric
8.44 g/cm³
Table 1: Chemical Composition of Monel K500
The elemental composition of Monel K500 is precision balanced to trigger precipitation hardening. Data in wt%.
| Grade |
C |
Mn |
S |
Si |
Ni |
Cu |
Fe |
Ti |
Al |
| Monel 400 |
≤0.3 |
≤2.0 |
≤0.024 |
≤0.5 |
≥63.0 |
28.0-34.0 |
≤2.5 |
— |
— |
| Monel K-500 |
≤0.2 |
≤1.5 |
≤0.015 |
≤0.5 |
≥63.0 |
27.0-34.0 |
0.5-2.0 |
0.3-1.0 |
2.2-3.5 |
Table 2: Typical Mechanical Properties of Monel K500
High performance yields under massive physical pressure metrics.
| Tensile Strength |
Yield Strength |
Elongation |
Hardness Range |
| ≥ 1100 MPa |
≥ 758 MPa |
≥ 20% |
26-32 HRC |
Table 3: Typical Physical Properties of Monel K500
Thermal and electronic characteristics under benchmark environments.
| Density |
Melting Point |
Thermal Expansion |
Thermal Conductivity |
Modulus of Elasticity |
Electrical Resistivity |
| 8.44 g/cm³ |
1315 – 1350 °C |
13.7 µm/m·°C (20-100°C) |
17.5 W/m·K (20°C) |
179 GPa |
0.62 x 10⁻⁶ Ω·m (20°C) |
Table 4: Seamless Monel K500 Pipe ASTM B829 Size Tolerance Chart
Standardized metric size variance constraints (mm).
| Nominal OD (in. / mm) |
OD Tolerance ± |
Wall (Nominal) ±% |
Wall (Min) ±% |
| Over 0.400 (10) to 5/8 (16), excl |
0.005 (0.13) |
15 |
30 |
| 5/8 (16) to 1 1/2 (38), incl |
0.0075 (0.19) |
10 |
22 |
| Over 1 1/2 (38) to 3 (76), incl |
0.010 (0.25) |
10 |
22 |
| Over 3 (76) to 4 1/2 (114), incl |
0.015 (0.38) |
10 |
22 |
| Over 4 1/2 (114) to 6 (152), incl |
0.020 (0.51) |
12.5 |
28 |
| Over 6 (152) to 6 5/8 (168), incl |
0.025 (0.64) |
12.5 |
28 |
| Over 6 5/8 (168) to 8 5/8 (219), incl |
0.031 (0.79) |
12.5 |
28 |
Monel K500 — Precipitation-Hardened Nickel-Copper Alloy Matrix
Monel K500 (UNS N05500) is a precipitation-hardenable nickel-copper alloy developed as a high-strength variant of Monel 400. The alloy maintains the same corrosion-resistant Ni-Cu matrix but incorporates aluminum (2.30–3.15%) and titanium (0.35–0.85%) additions that form gamma-prime Ni₃(Al,Ti) precipitates during age-hardening heat treatment. The result is a material that delivers roughly double the yield strength of annealed Monel 400 while preserving its outstanding resistance to seawater, hydrofluoric acid, and reducing chemical environments.
The Al and Ti additions also shift the Curie point down to approximately −101°C, keeping K500 non-magnetic across all practical service temperatures. Monel 400, by contrast, can show weak ferromagnetism near room temperature because its Curie point sits around 21–49°C. This non-magnetic character, combined with NACE MR0175-compliant hardness (HRC ≤ 35) in the age-hardened condition, makes K500 the standard choice for downhole drilling tools, non-magnetic drill collars, and subsea valve components in sour-service environments.
Key differentiator: Monel K500 offers Monel-level seawater and HF acid resistance plus high mechanical strength — unique in the nickel alloy space.
Detailed Composition & Role of Elements
Per ASTM B865 / AMS 4676 specifications. Weight percent metrics highlighting structural tasks.
| Element |
Min (%) |
Max (%) |
Role in Alloy Matrix |
| Nickel (Ni) |
63.0 |
70.0 |
Base element. Provides high-temperature strength, toughness, and electrochemical nobility. |
| Copper (Cu) |
27.0 |
33.0 |
Corrosion resistance driver — HF acid immunity and seawater resistance. |
| Aluminum (Al) ★ |
2.30 |
3.15 |
Gamma-prime former; lowers Curie point; reduces overall density footprint. |
| Titanium (Ti) ★ |
0.35 |
0.85 |
Co-forms gamma-prime precipitates; advances long-term creep resistance. |
| Iron (Fe) |
— |
2.00 |
Residual from melting; strictly managed to prevent Curie point elevation. |
| Manganese (Mn) |
— |
1.50 |
Deoxidizer agent; improves overall hot working operational capabilities. |
| Carbon (C) |
— |
0.25 |
Minor solid solution strengthener; limited to prevent micro carbide precipitation. |
| Silicon (Si) |
— |
0.50 |
Deoxidizer; supports high-temperature structural oxidation resistance. |
| Sulfur (S) |
— |
0.010 |
Tightly controlled to avoid hot cracking liabilities during welding procedures. |
★ Elements exclusive to K500 variant (not existing in standard Monel 400 setups)
Mechanical Properties by Processing Condition
Select your pipe composition variant based on structural fabrication requirements.
| Property |
Solution-Annealed |
Age-Hardened |
Cold-Worked + Aged |
Unit |
| Tensile Strength |
620 min |
965 min |
1100 min |
MPa |
| Yield Strength (0.2%) |
275 min |
690 min |
790 min |
MPa |
| Elongation Rate |
25 min |
20 min |
10 min |
% |
| Hardness Value |
75–95 HRB |
27–35 HRC |
30–38 HRC |
— |
Elastic / Physical Constants (Age-Hardened status): Modulus of Elasticity 179 GPa · Shear Modulus 66 GPa · Poisson’s Ratio 0.32 · Fatigue Strength ~340 MPa (at 10⁷ cycles)
Physical Properties (Age-Hardened State)
| Property Standard |
Value Charted |
Unit Metric |
| Density Matrix |
8.44 |
g/cm³ |
| Melting Range Limits |
1315 – 1350 |
°C (2400–2460 °F) |
| Thermal Conductivity (at 20°C) |
17.5 |
W/m·K |
| Specific Heat Constant (at 20°C) |
419 |
J/kg·K |
| Electrical Resistivity Profile (at 20°C) |
0.62 |
µΩ·m |
| Coefficient of Thermal Expansion (20–100°C) |
13.7 |
µm/m·°C |
| Curie Temperature Threshold (Annealed condition) |
−101 |
°C (Non-Magnetic) |
Age-Hardening Behavior & Heat Treatment Guidelines
Getting parameters right is critical for predictable final structural performance metrics.
| Process Step |
Temperature Scope |
Time / Cooling Specs |
Metallurgical Transformation Effect |
| 1. Solution Anneal |
870 – 980 °C |
~1 hr per 25mm thickness, water quench |
Dissolves Al/Ti completely into solid solution; soft, highly machinable (75–95 HRB). |
| 2. Cold Work (Optional) |
— |
10% to 20% total reduction |
Introduces high dislocation density → drives finer γ’ precipitates for extreme strength. |
| 3. Age Harden Treatment |
580 – 600 °C |
6 to 16 hours, furnace or still air cooling |
Triggers Gamma-prime Ni₃(Al,Ti) precipitation; peak structural hardness at ~595°C. |
⚠ Overaging Hazard Limit: Sustained operational exposure above 480°C (or short excursions above 540°C) coarsens γ’ precipitates. For applications above this thermal threshold, standard solid-solution strengthened Monel 400 is advised.
Corrosion Resistance Performance Matrix
Al and Ti components remain isolated within precipitates, keeping the Ni-Cu base immune to structural degradation.
| Environment Profile |
Performance Grade |
Technical Field Remarks |
| Seawater & Marine Operations |
Outstanding Rating |
Immune to chloride-induced SCC. Maintain minimum flow rates >0.6 m/s in stagnant environments. |
| Hydrofluoric Acid (HF) |
Total Immunity |
Resists all concentrations up to boiling thresholds. Standard for chemical processing shafts. |
| Sour Service (H₂S) — NACE MR0175 |
Certified Compliance |
Age-hardened processing restricted to HRC ≤ 35 qualifies for intense downhole tools. |
Monel K500 vs. Alternative Commercial Grades
K500 sits alone as the premier age-hardenable selection providing high yield resilience above 690 MPa.
| Alloy Grade |
Strength |
Seawater |
HF Acid |
Weldability |
Rel. Cost |
Engineering Application Case |
| Monel K500 |
★★★★★ |
★★★★ |
★★★★★ |
★★ |
|
High-strength marine & deep-well downhole |
| Monel 400 |
★★ |
★★★★ |
★★★★★ |
★★★★★ |
|
Weldable process equipment & core piping |
| Inconel 625 |
★★★★ |
★★★★★ |
★ |
★★★★ |
$$ $$$ |
Extreme oxidizing process environments |
| Inconel 718 |
★★★★★ |
★★ |
★ |
★★★ |
$$ $$ $ |
Aerospace engineering & high gas temps |
| 17-4 PH SS |
★★★★ |
★ |
★ |
★★★ |
$$ |
Budget option for dry/mild environments |
Typical Field Deployments Across Core Industries
| Sector Verticals |
Typical Applications & Engineered Systems Forms |
| Marine & Offshore |
Propeller shafts, heavy-duty pump shafts, valve stems, marine grade fasteners, specialty subsea springs, non-corrosive wire rope, high-load thrust washers. |
| Oil & Gas Infrastructure |
Downhole oilfield drilling tools, non-magnetic drill collars, directional logging instrument components, subsea control valve trims, sour service wellhead bolting configurations. |
| Chemical Processing |
HF alkylation system pump impellers, hazardous acid mixer blades, industrial centrifuges, deep reactor pressure vessel internals. |
| Power Generation |
High pressure steam turbine anchoring bolts, cooling tower condenser support components, nuclear reactor control mechanisms. |
| Aerospace Systems |
Heavy load landing gear hydraulic components, fluid fuel delivery actuators, specialized lock wire, high shear rate fasteners. |
Applicable International Specifications & Standards
| Standard ID |
Product Form / Operational Scope |
Technical Field Context Notes |
| ASTM B865 |
Bar stock, Rod tracks, Wire profiles, Heavy Forgings, Ring tracks |
Primary universal benchmark spec for K500 material forms. |
| ASTM B564 / ASME SB-564 |
Nickel Alloy Forgings (Pipeline Flanges, Heavy Fittings, Valve Bodies) |
Standard pressure vessel service parameters validation. |
| AMS 4676 |
Bar stocks, Rings — Aerospace structural grade (Pre-Age Hardened) |
Premium aviation field verification metrics enforcement. |
| QQ-N-286 |
Federal Specification for Ni-Cu-Al Hard Alloy Matrix |
Defense / Heavy naval military structural build standards. |
| NACE MR0175 / ISO 15156 |
Sour gas deployment environments — SSC Stress Crack Resistance |
Limits maximum system hardness down to HRC ≤ 35 profiles. |
Manufacturing Excellence & Quality Assurance Metrics
XinZhe employs advanced cold-drawing and precise age-hardening heat treatment to ensure every Monel K500 seamless pipe delivers optimal dimensional tolerance and maximum resistance to stress-corrosion cracking in sour-gas environments. Our production facility in Hebei, China, is equipped with state-of-the-art testing equipment including PMI (Positive Material Identification), ultrasonic testing, and hydrostatic testing to guarantee compliance with ASTM B163, ASTM B165, and QQ-N-286.
All pipes are supplied with EN 10204 3.1 certification, and we offer full traceability from melt to final delivery. Our quality control system includes dimensional inspection, hardness testing (HRC), and mechanical property verification (tensile, yield, elongation) on every lot. For sour service applications, we provide NACE MR0175-compliant certification with hardness ≤ 35 HRC upon request.
✅ Complete Facility Supply Scope Available: Seamless structural piping · Ground Round bars · Heavy Forge parts · Pipe Flanges · Custom Machined downhole components.
Approximate Weight Reference Chart – Monel K500 Seamless Pipe
Calculations evaluated based on baseline mass densities of 8.44 g/cm³ (kg/m metric parameters).
| OD (mm) |
WT 3 mm |
WT 5 mm |
WT 8 mm |
WT 10 mm |
WT 15 mm |
| 21.3 |
1.36 |
2.01 |
2.89 |
— |
— |
| 33.4 |
2.25 |
3.50 |
5.10 |
6.10 |
— |
| 48.3 |
3.35 |
5.34 |
8.10 |
9.90 |
14.20 |
| 60.3 |
4.23 |
6.82 |
10.52 |
12.95 |
18.90 |
| 88.9 |
6.35 |
10.35 |
16.20 |
20.10 |
29.80 |
| 114.3 |
8.20 |
13.50 |
21.10 |
26.30 |
39.20 |
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