Tesco Steel & Engineering manufactures ASTM B564 Monel K500 flanges — age-hardenable nickel-copper alloy flanges in grade Monel K500 (UNS N05500). K500 keeps the same nickel-copper base as Monel 400 but adds aluminium and titanium so it can be precipitation (age) hardened to roughly three times the yield strength of Monel 400 — while retaining the same outstanding resistance to seawater, hydrofluoric (HF) acid, brine and reducing acids. The high-strength choice for marine, offshore and oilfield service. Available in weld neck, slip-on, blind, socket-weld, threaded and lap-joint types to ASME B16.5 / B16.47. Class 150 to 2500, NPS 1/2″ to 24″, PN6 to PN400. ISO 9001:2015 certified. Made in India.
Monel K500 (ASTM B564 / UNS N05500) Flanges
Monel K500 Weld Neck & Blind Flanges
Tesco Steel & Engineering manufactures Monel K500 flanges per ASTM B564 and ASME B16.5, in all flange types from weld neck to blind, Class 150 to 2500 — supplied with EN 10204 3.1 / 3.2 certification, hardness testing, PMI and third-party inspection on request. Explore the wider Monel flange range, UNS N05500 Monel flanges, Monel 400 (B564) flanges, and the flange dimension charts.
| ASTM B564 Monel K500 flanges are available in the following specifications: | |
|---|---|
| Material Grade | Monel K500 / UNS N05500 / ASTM B564 / DIN 2.4375 / NiCu30Al |
| Alloy Type | Nickel-copper, age-hardenable (Al + Ti precipitation strengthened) |
| Size | 1/2″ NB to 24″ NB (DN 15 to DN 600); larger to ASME B16.47 |
| Class / Rating | 150#, 300#, 600#, 900#, 1500#, 2500# · 3000#, 6000#, 9000# (socket-weld / threaded) |
| Pressure Ratings | PN 6 – PN 400 (PN6, 10, 16, 25, 40, 64, 100, 160, 250, 320, 400) |
| Heat-Treatment Condition | Annealed or age-hardened (solution-anneal + age); specify per application |
| Standards | ASTM B564 (forgings), ASME B16.5, ASME B16.47 (Series A & B), MSS SP-44, DIN EN 1092-1 |
| Flange Types | Weld Neck (WNRF), Slip-On (SORF), Blind, Socket Weld (SWRF), Lap Joint, Threaded / Screwed, Plate, Long Weld Neck, Orifice |
| Flange Faces | Raised Face (RF), Flat Face (FF), Ring Type Joint (RTJ), Tongue & Groove (T&G) |
| Sour Service | NACE MR0175 / ISO 15156 with controlled hardness (typ. 35 HRC max) |
| Testing | PMI, hardness, hydrostatic, UT, MT/PT per spec; EN 10204 3.1 / 3.2 |
Monel K500 is Monel 400 with controlled aluminium and titanium additions. Solution annealing followed by an ageing (precipitation) treatment forms fine Ni₃(Al,Ti) particles that strengthen the alloy without sacrificing its nickel-copper corrosion resistance.
| Element | Monel K500 (UNS N05500) |
|---|---|
| Nickel (Ni) | 63.0% min |
| Copper (Cu) | 27.0 – 33.0% |
| Aluminium (Al) | 2.30 – 3.15% (hardening element) |
| Titanium (Ti) | 0.35 – 0.85% (hardening element) |
| Iron (Fe) | 2.00% max |
| Manganese (Mn) | 1.50% max |
| Carbon (C) | 0.25% max |
| Silicon (Si) | 0.50% max |
| Sulphur (S) | 0.010% max |
| Mechanical Property | Annealed | Age-Hardened |
|---|---|---|
| Tensile Strength (typ.) | ~620–760 MPa | ~1100 MPa (160 ksi) |
| Yield Strength 0.2% (typ.) | ~275–415 MPa | ~790 MPa (115 ksi) |
| Elongation (typ.) | ~35% | ~20% |
| Hardness (typ.) | ~140–180 HB | 27–35 HRC |
| Density | 8.44 g/cm³ | |
| Service temperature | Cryogenic up to ~480–650 °C (environment-dependent) | |
| Standard | Monel K500 Designation |
|---|---|
| UNS (USA) | N05500 |
| ASTM (forgings / flanges) | B564 (also B865 rod/bar) |
| EN / DIN (Europe) | 2.4375 / NiCu30Al |
| Werkstoff | 2.4375 |
| AMS / Military | AMS 4676 · QQ-N-286 |
| Common trade name | Monel K500 / Monel 500 |
Monel K500 Weld Neck (WNRF)
Monel K500 Slip-On (SORF)
Monel K500 Blind (BFF)
| Flange Type | Description & Monel-K500-Specific Use |
|---|---|
| Weld Neck (WNRF) | High-strength tapered hub for demanding marine and oilfield lines; weld in the annealed condition and re-age where full strength is needed. |
| Slip-On (SORF) | Fillet-welded over the pipe for moderate-pressure high-strength connections. |
| Blind (BFF) | Seals pipe ends and nozzles in high-strength seawater/HF service. |
| Socket Weld (SWRF) | Small-bore (1/2″–2″) high-strength instrument and injection connections. |
| Lap Joint (LJRF) | Used with a Monel stub end for frequent dismantling while economising on alloy in the ring. |
| Threaded (TRFF) | Internal NPT/BSP threads where K500's hardness resists galling and thread wear. |
| Long Weld Neck / Orifice / Plate | Nozzle, flow-metering and plate flanges in K500 for strength-critical corrosive duty. |
| Property | Monel K500 (N05500) | Monel 400 (N04400) | Inconel 718 (N07718) | Duplex 2205 (S32205) |
|---|---|---|---|---|
| Type | Ni-Cu age-hardenable | Ni-Cu solid solution | Ni-Cr age-hardenable | Duplex stainless |
| Hardenable | Yes (Al+Ti, aged) | No (cold work only) | Yes (aged) | No |
| Yield (high-strength) | ~790 MPa | ~195 MPa (annealed) | ~1035 MPa | ~450 MPa |
| Seawater / brine | Excellent | Excellent | Good | Excellent |
| Hydrofluoric (HF) acid | Excellent | Excellent | Good | Limited |
| Oxidising acids | Poor | Poor | Good | Good |
| Flange spec | ASTM B564 | ASTM B564 | ASTM B564 | ASTM A182 F60/F51 |
| Best For | High-strength seawater/oilfield shafts, fasteners, valves | Seawater, HF alkylation, brine | High-temp high-strength | Chloride / offshore process |
| Industry | Typical Application |
|---|---|
| Marine & Offshore | Pump and propeller shafts, fasteners, valve trim and high-strength seawater connections |
| Oil & Gas / Oilfield | Downhole tools, drill collars, instrument & wellhead components, fasteners (sour-service controlled) |
| Chemical Processing | High-strength connections in HF, brine, alkali and reducing-acid service |
| Desalination | High-strength seawater feed and brine handling components |
| Pumps & Valves | Stems, shafts and seat flanges needing strength + seawater corrosion resistance |
| Springs & Fasteners | Non-magnetic high-strength fasteners and springs for marine instruments |
Age-hardened Ni-Cu with ~3× the yield of Monel 400 and the same seawater/HF resistance — ideal for shafts, fasteners and valve trim.
Forged from certified age-hardenable nickel-copper alloy with PMI verification and documented heat-treatment condition.
WNRF, SORF, blind, socket-weld, threaded, lap-joint, LWN, orifice and plate — in RF, FF, RTJ and T&G faces.
EN 10204 3.1 / 3.2 MTC, hardness testing, NACE MR0175 hardness control and third-party inspection on request.
Monel K500 flange prices reflect the high nickel and copper content plus the added aluminium/titanium and age-hardening, so they carry a premium over Monel 400 and stainless grades. Tesco Steel & Engineering offers competitive ex-works pricing from Mumbai with full export documentation and heat-treatment traceability. Click Ask for Quote or message us on WhatsApp at +91 92233 66922 with flange type, size (NB), pressure class, condition (annealed/aged), quantity and documentation requirements.
Q1. What is an ASTM B564 Monel K500 flange?
An ASTM B564 Monel K500 flange is a pipe flange forged from Monel K500 (UNS N05500), an age-hardenable nickel-copper alloy. ASTM B564 is the specification for nickel-alloy forgings. K500 has the same nickel-copper base as Monel 400 plus aluminium and titanium, which let it be precipitation (age) hardened to roughly three times the yield strength of 400 while keeping the same outstanding resistance to seawater, hydrofluoric acid and brine. Flanges are machined to ASME B16.5 / B16.47.
Q2. What is the difference between Monel 400 and Monel K500 flanges?
Monel 400 (UNS N04400) is a solid-solution nickel-copper alloy that cannot be hardened by heat treatment; Monel K500 (UNS N05500) adds about 2.3–3.15% aluminium and 0.35–0.85% titanium so it can be age-hardened by precipitation of Ni₃(Al,Ti). The result is roughly three times the yield strength and greater hardness, with the same corrosion resistance. Choose 400 for general corrosion service, K500 when high strength, hardness or galling resistance is also required.
Q3. What is the chemical composition of Monel K500?
Monel K500 (UNS N05500) contains nickel 63% minimum, copper 27–33%, aluminium 2.30–3.15%, titanium 0.35–0.85%, iron 2.0% max, manganese 1.5% max, carbon 0.25% max, silicon 0.5% max and sulphur 0.01% max. The aluminium and titanium are the hardening elements that distinguish it from Monel 400.
Q4. How strong is Monel K500 compared with Monel 400?
In the age-hardened condition Monel K500 reaches roughly 1100 MPa tensile and 790 MPa yield strength, versus about 480 MPa tensile and 195 MPa yield for annealed Monel 400 — roughly three times the yield. Hardness rises to about 27–35 HRC. This high strength with seawater corrosion resistance is why K500 is used for pump and propeller shafts, fasteners and downhole tools.
Q5. Is Monel K500 used in seawater and hydrofluoric acid service?
Yes. Monel K500 retains the excellent corrosion resistance of Monel 400 — outstanding in flowing seawater, brine, hydrofluoric acid, alkalis and reducing acids, with high resistance to chloride stress-corrosion cracking. It is widely used for high-strength marine, offshore and oilfield components where both strength and seawater corrosion resistance are required.
Q6. Can Monel K500 flanges be welded?
Monel K500 can be welded with matching ERNiCu-7 (AWS A5.14) or Monel 400-type filler, but it is more sensitive than 400 because the aged structure loses strength in the weld heat-affected zone. Welding is best done in the annealed condition followed by re-ageing, joints must be clean and sulphur-free, and the age-hardening response considered in the procedure. For purely bolted flange connections this is not a concern.
Q7. Is Monel K500 susceptible to hydrogen embrittlement or sulphide stress cracking?
In the high-hardness aged condition Monel K500 can be susceptible to hydrogen embrittlement and sulphide stress cracking under cathodic protection or in sour (H₂S) service. For NACE MR0175 / ISO 15156 sour applications the hardness must be controlled (typically 35 HRC max) and the correct heat-treatment condition specified. Tesco supplies K500 flanges to the required hardness and condition with documentation.
Q8. What standards and equivalents apply to Monel K500 flanges?
Monel K500 flanges are made to ASTM B564 (forgings, UNS N05500) and dimensioned to ASME B16.5 / B16.47. Equivalents include DIN 2.4375 / NiCu30Al (Werkstoff 2.4375) and QQ-N-286. Related product specs include AMS 4676 and ASTM B865 (rod/bar).
Q9. What industries use Monel K500 flanges?
Monel K500 flanges and components are used in marine and offshore (pump and propeller shafts, fasteners, valve trim), oil & gas (downhole tools, drill collars, instrument and wellhead components), desalination, and chemical processing where high strength must be combined with seawater, brine, HF-acid or reducing-acid corrosion resistance.
Q10. Are ASTM B564 Monel K500 flanges supplied with material test certificates?
Yes. Every Monel K500 flange is supplied with EN 10204 3.1 (or 3.2) mill test certificates confirming chemistry, mechanical properties, hardness and heat-treatment (age-hardening) condition, with PMI, hardness testing and third-party inspection on request. Tesco Steel & Engineering is an ISO 9001:2015 certified manufacturer and exporter from Mumbai, India.