Monel K-500 is commonly specified when the corrosion resistance of Monel 400 is required together with substantially higher strength and hardness. Aluminum and titanium additions allow the alloy to be precipitation hardened, making it suitable for marine shafts, pump components, valve parts, fasteners, springs, oil and gas equipment, non-magnetic instruments and other components exposed to seawater, sour-gas environments and demanding mechanical loads.
A concise grade introduction for buyers who need to confirm composition, properties, standards, available forms and suitable applications before sending an inquiry.
Monel K-500 is commonly specified when the corrosion resistance of Monel 400 is required together with substantially higher strength and hardness. Aluminum and titanium additions allow the alloy to be precipitation hardened, making it suitable for marine shafts, pump components, valve parts, fasteners, springs, oil and gas equipment, non-magnetic instruments and other components exposed to seawater, sour-gas environments and demanding mechanical loads.
Technical data on this page is for material selection reference. Final acceptance values should be confirmed by the purchase standard, heat treatment condition, product form, size and material test certificate.
The following table shows common limiting composition values for Alloy 625 / UNS N06625. Actual product chemistry is reported by heat on the material test certificate.
| Element | Symbol | Typical Requirement | Role in Alloy K-500 |
|---|---|---|---|
| Nickel plus Cobalt | Ni + Co | 63.0 min | Provides the principal alloy matrix, corrosion resistance and metallurgical stability. |
| Copper | Cu | 27.0-33.0 | Provides resistance to seawater, reducing chemicals and many marine environments. |
| Aluminum | Al | 2.30-3.15 | Combines with nickel and titanium to form strengthening precipitates during aging. |
| Titanium | Ti | 0.35-0.85 | Supports precipitation hardening and improves the attainable strength and hardness. |
| Iron | Fe | 2.0 max | Controlled residual element that influences the alloy matrix and corrosion behavior. |
| Manganese | Mn | 1.5 max | Controlled minor element used during melting and deoxidation. |
| Silicon | Si | 0.50 max | Controlled residual and deoxidizing element. |
| Carbon | C | 0.25 max | Controlled to maintain suitable processing, ductility and corrosion performance. |
| Sulfur | S | 0.010 max | Strictly controlled impurity for hot workability and product quality. |
These values help customers compare density, thermal behavior, magnetic response and conductivity during early material selection.
| Property | Metric Value | Imperial / Notes | Condition |
|---|---|---|---|
| Density | 8.44 g/cm3 | 0.305 lb/in3 | Room temperature |
| Melting Range | 1315-1350 °C | 2400-2460 °F | Typical range |
| Specific Heat | Approx. 419 J/kg·°C | 0.100 Btu/lb·°F | Approx. 21 °C, annealed before testing |
| Thermal Conductivity | 17.2 W/m·°C | 121 Btu·in/ft2·h·°F | Approx. 21 °C, annealed before testing |
| Electrical Resistivity | 0.615 µΩ·m | 370 ohm-cmil/ft | Approx. 21 °C; thermal-history dependent |
| Modulus of Elasticity | Approx. 179 GPa | Approx. 26.0 x 103 ksi | Tension, room temperature |
| Poisson’s Ratio | Approx. 0.32 | Dimensionless | Age-hardened, room temperature |
| Magnetic Permeability | Approx. 1.001-1.002 | Virtually non-magnetic | Room temperature, condition dependent |
Mechanical properties vary with product form, size, processing route and heat treatment. The table below summarizes commonly referenced nominal values for material selection.
| Product Form / Condition | Tensile Strength | Yield Strength, 0.2% | Elongation | Hardness |
|---|---|---|---|---|
| Rod and bar – hot finished, annealed | 621-758 MPa | 276-414 MPa | 25-45% | 75-90 HRB |
| Rod and bar – hot finished, aged | 965-1310 MPa | 690-1034 MPa | 20-30% | 27-38 HRC |
| Rod and bar – cold drawn, aged | 931-1276 MPa | 655-1103 MPa | 15-30% | 25-41 HRC |
| Sheet and strip – cold rolled, annealed | 621-724 MPa | 276-448 MPa | 25-45% | 85 HRB max |
| Strip – annealed and aged | 896-1172 MPa | 621-827 MPa | 15-25% | 24 HRC min |
| Seamless pipe and tube – annealed and aged | 896-1241 MPa | 586-827 MPa | 15-30% | 24-36 HRC |
| Plate – hot finished and aged | 965-1241 MPa | 690-931 MPa | 20-30% | 27-37 HRC |
| Wire – cold drawn, annealed and aged | 827-1034 MPa | 621-758 MPa | 15-30% | By specification |
| Wire – spring temper and aged | 1103-1379 MPa | 965-1310 MPa | 3-8% | By specification |
For pressure equipment, aerospace parts or project-specific acceptance, use the minimum requirements in the specified ASTM, ASME, AMS, EN or customer drawing rather than nominal values.
YSN128 can quote Alloy 625 products according to ASTM, ASME, AMS, EN, DIN, ISO or customer drawing requirements. Certificate scope can be matched to the purchase order.
| Product Form | Common Standards | Typical Supply Item | Certificate / Inspection |
|---|---|---|---|
| Plate, Sheet, Strip | QQ-N-286, DIN 17750, BS 3072 NA18, BS 3073 NA18, ISO 6208 | Hot rolled plate, cold rolled sheet, strip and cut blanks | EN10204 3.1, chemical analysis, mechanical test and heat-treatment record |
| Rod and Bar | ASTM B865 / ASME SB865, AMS 4676, DIN 17752, BS 3076 NA18, ISO 9723, QQ-N-286 | Round bar, rod, flat bar, square bar and hexagonal bar | MTC, tensile test, hardness test, PMI and dimensional inspection |
| Wire | ASTM B865, DIN 17753, BS 3075 NA18, ISO 9724, QQ-N-286 | Cold drawn wire, spring wire and wire rod | Chemical analysis, tensile test, dimensional inspection and MTC |
| Seamless Pipe & Tube | DIN 17751, BS 3074 NA18, project specifications | Seamless pipe, precision tube and mechanical tubing | Hydrotest or pneumatic test, eddy current test, dimensional inspection and MTC |
| Forgings and Forging Stock | ASTM B865 / ASME SB865, DIN 17754, ISO 9725, QQ-N-286 | Rings, discs, blocks, shafts and custom forgings | Heat-treatment record, tensile test, hardness test, UT and MTC |
| Fasteners and Bolting | ASTM B865 material, AMS 4676, ASME Code Case 1192, project specifications | Bolts, nuts, studs, screws, washers and marine fasteners | Mechanical testing, hardness test, PMI, dimensional inspection and MTC |
| Flanges and Fittings | ASTM B865 material, ASME B16.5, ASME B16.9, ASME B16.11 or drawing specifications | Machined flanges, elbows, tees, reducers and special fittings | PMI, dimensional inspection, NDT and MTC |
| Joining Consumables | AWS A5.14 ERNiCu-7 or approved matching-composition procedure | Welding wire and joining consumables selected for the fabrication requirement | Consumable certificate, chemistry verification and welding procedure qualification |
Review available product forms, size ranges, standards and delivery options for this alloy.
| Form | Common Size Range | Delivery Condition | Typical Applications | Page Link |
|---|---|---|---|---|
| Pipe & Tube | OD 6-610 mm, wall thickness or schedule to specification | Seamless, cold drawn, annealed, aged, pickled or machined | Marine tubing, pump components, oilfield instruments and high-strength fluid systems | View Pipe & Tube |
| Round Bar | Diameter 3-500 mm, custom cut lengths available | Hot finished, cold drawn, annealed, aged, peeled or polished | Pump shafts, valve stems, drill collars, fasteners and machined components | View Round Bar |
| Sheet & Plate | Thickness 0.5-150 mm, custom widths and lengths | Hot rolled, cold rolled, annealed, aged, pickled or polished | Marine components, chemical equipment, scrapers, structural parts and custom fabrication | View Sheet & Plate |
| Strip & Foil | Thickness 0.02-6 mm, slit widths to specification | Cold rolled, annealed, spring temper, aged or bright finished | Springs, diaphragms, precision components and corrosion-resistant flexible parts | View Strip & Foil |
| Wire | Diameter 0.1-20 mm, coil, spool or straight-length supply | Cold drawn, annealed, spring temper, aged, bright or pickled | Marine springs, cables, fasteners, screens and precision instruments | View Wire |
| Fasteners | Standard and custom bolts, nuts, studs, screws and washers | Machined or thread rolled, annealed or age hardened | Marine equipment, pump assemblies, offshore systems and chemical processing equipment | View Fasteners |
| Fittings | ASME, ANSI, DIN, EN and custom drawing dimensions | Machined from bar or forgings, annealed or age hardened | High-strength marine systems, chemical lines and oil and gas equipment | View Fittings |
| Flanges | ASME B16.5, ASME B16.47, EN and custom specifications | Forged, annealed, age hardened, machined and inspected | Offshore piping, pressure equipment, pumps, valves and marine systems | View Flanges |
| Forgings | Rings, discs, blocks and shafts up to project-specific dimensions | Forged, solution treated, age hardened, rough or finish machined | Pump shafts, impellers, valve parts, offshore equipment and heavily loaded components | View Forgings |
| Welding Wire | Diameter 0.8-4.0 mm, spool, coil or straight-length supply | ERNiCu-7 or matching-composition consumables subject to technical confirmation | Joining, repair welding and fabrication of Monel K-500 components | View Welding Wire |
This guide helps buyers connect service conditions with the typical advantage of Alloy 625. Final selection should consider medium concentration, temperature, pressure, fabrication, availability and budget.
| Service Requirement | Why Alloy K-500 Helps | Common Product Form | Buyer Note |
|---|---|---|---|
| High-strength marine components | Combines low corrosion rates in flowing seawater with substantially higher strength than Monel 400. | Round bar, forgings, fasteners, shafts and wire | Confirm seawater velocity, stagnant exposure, load and required aged condition. |
| Pump shafts and impellers | Provides high strength, good dimensional stability and resistance to marine and chemical environments. | Round bar, forged shafts, discs and custom forgings | Specify final dimensions, machining allowance, heat treatment and NDT requirements. |
| Oil and gas equipment | Offers useful strength, low magnetic permeability and resistance in selected sour-gas environments. | Bar, tube, fasteners, forgings and machined components | Confirm the applicable NACE or ISO 15156 limits, hardness and environmental conditions. |
| Corrosion-resistant fasteners | Age hardening produces high tensile and yield strength while retaining nickel-copper corrosion resistance. | Bolts, studs, nuts, screws and washers | Specify thread standard, property requirement, hardness and final heat-treatment condition. |
| Non-magnetic instruments | Maintains very low magnetic permeability while offering high strength and good dimensional stability. | Bar, wire, tube and precision-machined parts | State the maximum permitted permeability and required surface treatment. |
| Springs and elastic components | Cold working followed by aging can provide high strength and useful spring performance. | Wire, strip and custom spring components | Confirm wire temper, coil dimensions, aging cycle and operating temperature. |
| Chemical processing equipment | Resists many reducing media, alkalis and salt solutions while carrying higher mechanical loads than Monel 400. | Plate, bar, tube, fittings and forgings | Review the complete process chemistry, concentration, aeration and temperature. |
| Cryogenic and low-temperature service | Strength increases at low temperature without a ductile-to-brittle transition under typical tested conditions. | Bar, plate, tube, fasteners and forgings | Confirm impact testing, design code and the specified low-temperature condition. |
For ranking traffic, buyers need more than a data sheet. This section gives clear trust signals for procurement, engineering and quality teams.
Quotation can be matched to project standards and product form specifications.
Heat number, chemistry, mechanical properties and inspection records can be supplied.
PMI, UT, dimensional inspection, visual inspection and packing check are available.
Cutting, machining allowance, rough machining and drawing-based supply can be arranged.
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Find practical answers about procurement, standards, fabrication and industrial applications.
Monel K-500 is commonly used for marine pump shafts, impellers, valve stems, fasteners, chains, cables, springs, oil-well tools, non-magnetic instruments and high-strength components exposed to seawater or chemical-processing environments.
Yes. UNS N05500 is the standardized UNS designation for Monel K-500. The alloy may also be identified as Alloy K-500, Nickel Alloy K-500, W.Nr. 2.4375 or NiCu30Al.
Monel K-500 has corrosion resistance broadly similar to Monel 400 but contains aluminum and titanium so that it can be precipitation hardened. The aged alloy therefore provides considerably higher tensile strength, yield strength and hardness than Monel 400.
Yes. Monel K-500 has a low corrosion rate in high-velocity seawater and is widely used for marine shafts, fasteners and pump components. Stagnant or slow-moving seawater can permit fouling and localized pitting, so the complete service conditions should be reviewed.
YSN128 can quote plate, sheet, strip, round bar, rod, wire, seamless pipe, seamless tube, forgings, flanges, fittings and fasteners. Custom cutting, heat treatment, machining allowance and drawing-based production can also be discussed.
ASTM B865 and ASME SB865 are commonly used for bar, rod, wire, forgings and forging stock. Other specifications include AMS 4676, QQ-N-286, DIN 17750 through DIN 17754, ISO 6208, ISO 9723, ISO 9724, ISO 9725 and relevant British Standards.
Monel K-500 is strengthened by an age-hardening treatment that precipitates fine nickel-aluminum-titanium particles throughout the alloy matrix. The correct aging cycle depends on the product form, prior processing condition, dimensions and required mechanical properties.
Yes. Monel K-500 can be welded using qualified nickel-copper welding procedures. ERNiCu-7 is commonly used, but this weld metal is not age hardenable and will not normally match the strength of age-hardened K-500 base material. Strength-critical welds require engineering review and an approved welding procedure.
Yes. EN10204 3.1 material certificates can be supplied on request with the heat number, chemical composition, mechanical test results, heat-treatment condition and applicable inspection records.
Please send the grade or UNS number, product form, dimensions, quantity, applicable material standard, delivery and age-hardening condition, required mechanical properties, certificate requirements and destination. Drawings, NDT requirements and service conditions are also helpful.
Send your required grade, product form, size, quantity, standard, certificate and destination. We will help check availability, production route, inspection scope and practical delivery plan.
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