Monel Flanges
ASTM B564 / ASME SB564 | UNS N04400 & N05500 | Sizes 1/2″ to 48″ NB | Pressure Class 150#–2500# | EN10204 3.1 MTC Standard
ISO 9001:2015 Certified • 25+ Years of Piping Expertise • Exported to 40+ Countries • 100% Mill-Tested Material
Table of Content
- What is Monel Flanges?
- Specification of Monel Flanges
- Chemical Composition of Monel 400 Flanges
- Mechanical Composition of Monel 400 Flanges
- Flange Face Types
- Monel 400 vs Monel K500 Flanges
- Monel Flanges Applications & Industries Served
- Manufacturing Process & Quality Assurance
- Certifications & Standards
- Monel Flanges Price
- FAQs about Monel Flanges
Monel Flanges Manufacturer & Supplier in India — ASTM B564 / ASME SB564
Kalpataru Piping is a reliable manufacturer, stockist, exporter of Monel flange providing to industries where normal materials are unable to perform when subjected to corrosive, high-pressure or high-temperature. All Monel 400 flanges we sell are forged, machined to ASTM B564 UNS N04400 (B564 N04400) and to pressure classes 150 to 2500, ANSI/ASME B16.5 and ASME B16.47 size range 1/2″ NB to 48″ NB. As standard we supply each flange supplied with EN10204 3.1 mill test certificates, additionally all flanges we supply are chemically analysed, PMI tested and hydrostatically tested before dispatch. Our in-house forging and machining facility delivers you weld neck, slip-on, blind, socket weld, threaded, lap joint and Ring type joint (RTJ) flanges to chemical, oil & gas, marine, power generation and pharmaceutical industry as well as nationwide and worldwide. Collaborate with Kalpataru Piping on flanges that offer metallurgical precision and reliable, timely delivery.
What is Monel Flanges?
Monel is a family of nickel-copper alloys primarily Monel 400 and Monel K500 prized for outstanding resistance to seawater, hydrofluoric acid, and reducing chemical environments. Monel flanges connect pipes, valves, and equipment in piping systems that must resist corrosion, chloride stress cracking, and cyclic thermal loads. As part of our broader Monel Products range, Kalpataru Piping manufactures Monel flanges alongside Monel buttweld fittings, Monel pipes and tubes, and Monel fasteners, giving project engineers a single, quality-assured source for complete Monel piping systems.
Our flanges are available in Monel 400 often referred to as Alloy 400 flanges and specified to ASTM B564 UNS N04400 (see our dedicated Monel 400 flanges page) and Monel K500 (see Monel K500 flanges) grades, forged to close tolerances and finished to Raised Face (RF), Flat Face (FF), or Ring Type Joint (RTJ) configurations. Every Monel 400 flange leaving our facility is traceable to its B564 UNS N04400 heat number, giving project teams full material traceability from mill to site.
Monel Flanges Material Grades
Monel Flanges Technical Specifications
| Parameter | Details |
|---|---|
| Material Standard | ASTM B564 UNS N04400 (B564 N04400) / ASME SB564 |
| Dimensional Standard | ANSI/ASME B16.5, B16.47 (Series A & B), B16.36, B16.48 |
| Other Standards | BS 4504, BS 10 (Tables D, E, F, H), DIN 2527/2566/2573/2576/2641–2673, JIS B2220 |
| Size Range | 1/2″ NB to 48″ NB (DN15 to DN1200) |
| Pressure Class | 150#, 300#, 600#, 900#, 1500#, 2500# / PN6 to PN64 |
| Flange Face Type | Flat Face (FF), Raised Face (RF), Ring Type Joint (RTJ) |
| Grades | Monel 400 / Alloy 400 flanges (ASTM B564 UNS N04400), Monel K500 flanges (UNS N05500) |
| Certification | EN10204 Type 3.1 standard; Type 3.2 on request |
Chemical Composition of Monel Flanges
| Element | Monel 400 | Monel K500 |
|---|---|---|
| Nickel (Ni) | 63% min | 63–70% |
| Copper (Cu) | 28–34% | 27–33% |
| Iron (Fe) | 2.5% max | 2.0% max |
| Manganese (Mn) | 2.0% max | 1.5% max |
| Carbon (C) | 0.30% max | 0.25% max |
Mechanical Properties of Monel Flanges
| Property | Monel 400 | Monel K500 |
|---|---|---|
| Tensile Strength (min) | 550 MPa (80 ksi) | 896 MPa (130 ksi) |
| Elongation (min) | 35% | 20% |
| Hardness (Brinell) | 110–149 HB | 175–250 HB |
| Max Service Temperature | 550°C (1022°F) | 480°C (896°F) |
| Melting Point | ~1350°C | ~1350°C |
Types of Monel Flanges We Manufacture
Monel Blind Raised Face Flanges (BLRF)
Monel Forged Flanges
Monel Orifice Flanges
Monel Plate and Flat Face Flanges
Monel Reducing Flanges
Monel Ring Type Joint Flanges (RTJ)
Monel Slip-On Raised Face Flanges (SORF)
Monel Socket Weld Flanges (SWRF)
Monel Spectacle Blind Flanges
Monel Threaded Flanges
Monel Tongue and Groove Flanges
Monel Weld Neck Flanges (WNRF)
Flange Face Types & When to Use Them
| Face Type | Code | When to Use |
|---|---|---|
| Flat Face | FF | Full-bore gasket contact; used with cast iron or bronze mating equipment to avoid damage |
| Raised Face | RF | Most common type; concentrates bolt load over a smaller gasket area for efficient sealing (Class 150–2500) |
| Ring Type Joint | RTJ | Metal-to-metal seal using a soft metallic ring gasket; specified for Class 600 and above, high-pressure/high-temperature service |
Monel 400 vs Monel K500 Flanges
| Criteria | Monel 400 (UNS N04400) | Monel K500 (UNS N05500) |
|---|---|---|
| Strength | Moderate (550 MPa tensile) | High (896 MPa tensile, ~3x Monel 400 yield strength) |
| Hardening | Solid-solution strengthened; can be cold-worked | Precipitation-hardened (age-hardenable); requires post-weld age-hardening treatment |
| Corrosion Resistance | Excellent in seawater, acids, alkalis and HF acid service | Same corrosion resistance as Monel 400 with significantly higher strength |
| Magnetic Properties | Weakly magnetic when cold-worked | Non-magnetic; suitable for degaussing equipment and sensitive instrumentation |
| Typical Applications | Seawater piping, chemical process piping, HF alkylation units, heat exchangers | Offshore propeller shafts, pump impellers, oil drilling tools, turbine blades |
| Relative Cost | Lower cost; most economical for general corrosive service | Higher cost; justified where high mechanical load and corrosion resistance are both required |
Monel Flanges Applications & Industries Served
- Chemical & Petrochemical Processing — handling hydrofluoric acid, sulfuric acid, and chlorinated solvents in alkylation units and reactors
- Oil & Gas / Offshore — subsea pipelines, wellhead equipment, and seawater cooling systems resistant to chloride stress corrosion cracking
- Marine Engineering — pump shafts, seawater piping, and propeller hub connections exposed to continuous saltwater
- Power Generation — heat exchangers, condenser tube sheets, and steam generator components under thermal cycling
- Pharmaceutical & Food Processing — non-contaminating flanges for caustic and mild-acid cleaning lines
- Pulp & Paper Industry — resistance to bleaching chemicals and acidic process streams
- Aerospace & Defence — Monel K500 flanges where high strength, non-magnetic behaviour, and corrosion resistance are all required together
Manufacturing Process & Quality Assurance
Every Monel flange passes through a controlled manufacturing and inspection workflow:
- Raw material sourcing with certified mill test reports
- Forging to near-net shape under controlled temperature
- CNC machining to ANSI B16.5 / B16.47 dimensional tolerances
- Heat treatment (age-hardening for Monel K500)
- Surface finishing and face-type machining (FF/RF/RTJ)
- Final inspection, packing, and dispatch
| Test | Purpose |
|---|---|
| Chemical Analysis | Verifies alloy composition meets ASTM B564 requirements |
| Positive Material Identification (PMI) | On-site XRF verification of material grade before dispatch |
| Mechanical Testing | Tensile, yield strength, and elongation testing per ASTM standards |
| Hardness Test | Brinell hardness testing to confirm heat treatment condition |
| Hydrostatic Pressure Test | Leak testing under pressure to confirm flange body integrity |
| Dimensional Inspection | Full dimensional check against ANSI B16.5 / B16.47 drawings |
| Pitting Resistance Test | ASTM G48 or equivalent, verifying corrosion resistance in aggressive media |
Certifications & Standards
| Standard | Scope |
|---|---|
| ANSI/ASME B16.5 | Pipe flanges and flanged fittings from NPS 1/2″ to NPS 24″, Class 150–2500 |
| ANSI/ASME B16.47 | Large-diameter flanges from NPS 26″ to NPS 60″, Series A & B |
| ANSI/ASME B16.36 | Orifice flanges, NPS 2″ to NPS 24″ |
| ANSI/ASME B16.48 | Line blanks, NPS 1/2″ to NPS 24″ |
| BS 4504 / BS 10 | Flanges to PN series and Tables D, E, F, H |
| DIN Standards | DIN 2527–2673 covering face types, pressure ratings, and dimensions for European markets |
All Kalpataru Piping Monel flanges are supplied with EN10204 Type 3.1 Mill Test Certificates as standard; Type 3.2 third-party witnessed certification is available on request, along with QAP, radiography reports, and third-party inspection coordination.
Monel Flanges Price
The Monel Flanges price varies according to the grade, size, flange type, pressure class, quantity, facing, and inspection requirements. Raw material availability and market conditions can also affect the final cost. Kalpataru Piping supplies Monel Flanges according to customer specifications and provides project-based quotations. Contact us with your required specifications to get the latest price.
Monel Flanges Sizes
Monel Flanges are available in various nominal sizes to suit different piping requirements. Standard sizes can be supplied according to applicable dimensional standards such as ASME B16.5, while larger sizes can be supplied according to relevant standards and project specifications. Custom dimensions, bore sizes, thicknesses, and configurations can also be manufactured based on approved drawings and customer requirements.
Related Products
FAQ’s About ASTM A106 Grade B Pipes
What is ASTM A106 Grade B pipe?
ASTM A106/A106M Grade B is a seamless carbon steel pipe specification intended for high-temperature service. The exact project suitability depends on the governing piping code, design conditions and purchase specification.
What is the difference between ASTM A106 Grade B and ASTM A53 Grade B?
ASTM A106 Grade B is a seamless high-temperature-service pipe specification. ASTM A53 Grade B covers welded and seamless pipe for mechanical and pressure applications and ordinary steam, water, gas and air service. Select the specification required by the project and design code.
What sizes does Kalpataru supply?
The current brief lists a Kalpataru supply range of 1/2 to 36 in NPS and Schedule 10 to XXS, subject to size and availability. ASTM A106/A106M itself has a wider standard scope.
What is the maximum temperature of ASTM A106 Grade B pipe?
Do not use one universal maximum temperature from the ASTM material specification. Allowable service depends on the design code, pressure, wall thickness, allowable stress and project conditions.
Is ASTM A106 Grade B seamless or welded?
ASTM A106/A106M is a seamless carbon steel pipe specification. Do not describe ERW, LSAW or other welded pipe as ASTM A106 product construction.
What tests are required for ASTM A106 Grade B pipe?
The specification includes mechanical testing and bend/flattening testing as applicable, together with hydrostatic and/or nondestructive electric testing requirements. The exact inspection package should match the current ASTM edition and purchase order.
What documents can be supplied?
Orders can be supplied with EN 10204 3.1 MTC and, where applicable and agreed, IBR documentation, third-party inspection and project-specific test reports.
How is ASTM A106 Grade B pipe priced?
Price depends on NPS, schedule or wall thickness, length, quantity, origin/mill, testing/certification, coating/end preparation and delivery destination. Send the full requirement for a size-wise quotation.
