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Golden Steel Material is a premier ISO-certified stockist based in Al Jubail. We supply high-performance pipes, fittings, valves, and flanges to the Oil & Gas and Industrial sectors across Saudi Arabia and the GCC.

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Monel 400 / K500 Flanges

Monel 400 / K500 Flanges
Sizes: 1/2" to 24" (DN15 to DN600)
Pressure Class: Class 150 to 2500, PN6 to PN160
Grades: Monel 400 (N04400), Monel K500 (N05500)
Standard: ASTM B564, ASME B16.5, B16.47, DIN 2633
Face Type: RF, FF, RTJ, Lap Joint, Male & Female
Surface Finish: Natural, Machined, Black Phosphating, Oiled
Process: Forged, CNC Machined, Age Hardened (K500)
Origin: India, Japan, Germany, USA
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Monel 400 and K500 Flanges are high-performance nickel-copper alloy components renowned for their exceptional resistance to seawater, steam, and highly corrosive chemical solutions. Monel 400 (UNS N04400) is a solid-solution alloy that offers excellent toughness and corrosion resistance across a wide temperature range, making it a standard material for marine engineering, salt production, and hydrocarbon processing. It is particularly resistant to rapidly flowing brackish water and seawater, providing a reliable sealing solution in offshore environments.

For applications requiring greater mechanical strength, Monel K500 (UNS N05500) flanges provide the same corrosion resistance as the 400 grade but with the added benefits of increased yield and tensile strength. This is achieved through age hardening (precipitation hardening), where aluminum and titanium additions create submicroscopic particles throughout the matrix. Our range of Monel weld neck, slip-on, blind, and lap joint flanges are manufactured to ASTM B564 specifications, ensuring they meet the rigorous pressure and safety standards of the oil, gas, and aerospace industries. Each flange is precision-engineered to provide long-term durability against stress-corrosion cracking and pitting in the most volatile conditions.



Monel 400 / K500 Flanges Features

  • » Exceptional Seawater Resistance: Monel 400 is highly resistant to rapidly flowing seawater and brackish water, making these flanges the industry standard for marine piping and offshore platforms.
  • » High-Strength Performance (K500): The K500 variant undergoes age-hardening, providing approximately three times the yield strength of the 400 grade while maintaining identical corrosion resistance.
  • » Acid & Alkali Defense: Demonstrates remarkable resistance to hydrofluoric acid, sulfuric acid, and various alkalis, ideal for chemical processing and pickling operations.
  • » Stress-Corrosion Cracking Immunity: Virtually immune to chloride-ion stress-corrosion cracking in most fresh and industrial water environments.
  • » Temperature Versatility: Maintains excellent mechanical properties from sub-zero temperatures up to 480°C (900°F), ensuring structural stability in diverse climates.
  • » Non-Magnetic Properties: Monel K500 is essentially non-magnetic even at quite low temperatures, which is critical for electronic and sensitive military applications.
  • » Precision Forging Integrity: Forged under ASTM B564 standards to ensure a dense, uniform grain structure that prevents leakage under high-pressure gas or fluid service.
  • » Superior Weldability: Both grades offer excellent weldability for fabrication, allowing for secure attachments via weld neck or socket weld configurations.

Monel 400 / K500 Flanges Specification

Dual Grade Options

  • Monel 400: UNS N04400 / W.Nr. 2.4360
  • Monel K500: UNS N05500 / W.Nr. 2.4375
  • Specification: ASTM B564 / ASME SB564
  • Standard: Forged Nickel-Copper Alloys

WNRF & SORF Types

  • Weld Neck (WNRF): High-stress marine piping service
  • Slip-On (SORF): Ease of install in low-pressure desalination
  • Facing: Serrated Raised Face (RF) for high-grip sealing
  • Advantage: Exceptional resistance to flowing seawater

Small Bore Connections

  • Socket Weld (SWRF): Critical for chemical dosing lines
  • Threaded Flanges: Used where welding is prohibited
  • Monel K500 Feature: Non-magnetic for sensitive electronic areas
  • Corrosion: Resists HF and Sulfuric acids

Isolation Integrity

  • Blind Flange (BLRF): For capping pressure vessels & pumps
  • Spectacle Blind: Reliable bypass for refinery turnarounds
  • K500 Benefit: Enhanced strength for high-pressure shut-off
  • Integrity: High resistance to stress-corrosion cracking

Specialty Seals

  • Lap Joint Flanges: Pairs with stub ends for easy bolt alignment
  • RTJ Flange: Metal-to-metal seal for Class 2500# service
  • Groove: Precise CNC-machined octagonal/oval profiles
  • Application: Deep-sea oil wellheads and subsea valves

Flow & Facing

  • Orifice Flanges: For differential pressure flow measurement
  • Raised Face (RF): Optimized for standard spiral wound gaskets
  • Ring Flange: For plate-to-vessel high-integrity connections
  • Environment: Brine heaters and salt evaporator units

Mechanical Limits

  • Pressure Class: 150#, 300#, 600#, 900#, 1500#, 2500#
  • Temp Range: Sub-zero to 480°C (900°F)
  • K500 Yield: 3x the strength of Monel 400
  • Standards: ASME B16.5, B16.47 Series A & B

Size Parameters

  • Size Range: 1/2" (DN15) to 24" (DN600)
  • Process: Forged, CNC Machined, Age Hardened (K500)
  • Customization: Manufacturing per client blueprints
  • Thickness: Sch 10S to Sch XXS

Quality Control

  • Testing: PMI, Ultrasonic, LPT, and Magnetic Permeability
  • Certification: EN 10204 3.1 MTC, IBR, NACE Compliance
  • Hardness: Verified for Age-Hardened Monel K500
  • Origin: Global sourcing from India, USA, and Europe

Monel 400 / K500 Flanges Detailed Specifications

Specification Details
Specification: ASTM / ASME SB 564 / 160 / 472
UNS Grade: Monel 400 (UNS No. N04400), Monel K500 (UNS No. N05500)
Standard: ANSI Flanges, ASME Flanges, BS Flanges, DIN Flanges, EN Flanges, etc.
Types of Flanges: Weld neck Flanges (WNRF), Slip-on Flanges (SORF), Blind Flanges (BLRF), Lap Joint Flanges (SOLJ), Socket-weld Flanges (SWRF), Screwed (Threaded) Flanges, Long weld neck Flanges (LWNRF), Spectacle Blind Flanges, Spacer & Blind Flanges, Ring Type Joint Flanges (RTJ), Reducing Flanges, Raised Face (RF) Flanges, Orifice Flanges, Large Diameter Flanges, Custom Flanges, Drawing Flanges, Forged Flanges, Plate Flanges, Flat Face Flanges, etc.
Flange Face Type: Flate Face (FF), Raised Face (RF), Ring Type Joint (RTJ)
Dimensions: ANSI/ASME B16.5, B 16.47 Series A & B, B16.48, BS4504, BS 10, EN-1092, DIN, etc.
Size Range: ½” to 36″
Pressure Ratings: 150#, 300#, 600#, 900#, 1500#, 2500#, PN6, PN10, PN16, PN25, PN40, PN64 etc.
Coating/Surface Treatment: Anti-rust Paint, Oil Black Paint, Yellow Transparent, Zinc Plated, Cold and Hot Dip Galvanized
Marking & Packing: Products are packaged to ensure that there is no damage during transit. In case of exports, standard export packaging is done in wooden cases. All flanges are marked with Grade, Lot No, Size, Degree and our trade mark. On special requests we can also, make custom marking on our products.
Test Certificates: Manufacturer Test Certificate as per EN 10204 / 3.1B, Raw Materials Certificate, 100% Radiography Test Report, Third Party Inspection Report
Value Added Services: CNC Machining, Customised Flanges

Monel 400 / K500 Flanges Type, Size Range & Dimensional Standards

Flange Type Dimension Range Standard / Drawing Valid Norm
Monel 400 / K500 Blind Flanges DN15 – DN2500 DIN2527 PN16 DN150 BL 300lb 6"
½" – 24" Standard ANSI / ASME Class 150 to 2500
Monel 400 / K500 Threaded with neck DN15 – DN150 DIN2566 DN32 / 42.4 TH 300lb 1"
Monel 400 / K500 Threaded Flanges ½" – 24" Standard Threaded NPT / BSPT Sizes
Flanges smooth for welding (Plate) DN15 – DN2500 DIN2576 DN150
Monel 400 / K500 Welding Neck Flanges DN15 – DN2500 DIN2635 DN150 / 168.3 WN 300lb 6", GOST Dy150 Py16
½" – 24" / Dy10 – Dy2400 ASME B16.5 WN Classes 150 – 2500
Monel 400 / K500 loose flanges, smooth Bunde DN15 – DN2500 DIN2642 DN150
Monel 400 / K500 loose flanges Stub DN15 – DN2500 DIN2673 DN150
Monel 400 / K500 Welding flanges with neck DN15 – DN2500 DIN86030 DN150
Monel 400 / K500 Slip On Flanges ½" – 24" SO 300lb 6"
Dy10 – Dy2400 GOST Standard Specifications
Monel 400 / K500 Lap Joint Flanges ½" – 24" LJ 300lb 6"
Monel 400 / K500 Socket Welding Flanges ½" – 3" SW 300lb 6"
Forged and Plate Flanges
(Slip-On, Weld Neck, Blind, Lap Joint, Threaded, Socket Weld, Reducing, Plate)
½" – 36" Raised Face (RF), Flat Face (FF), Ring Type Joint (RTJ), Lap-Joint Face (LJF), Large Male-Female (LMF), Small Male-Female (SMF), Large Tongue & Groove, Small Tongue & Groove

Types of Monel 400 / K500 Flanges

Monel 400 / K500 Weld Neck Flange

Monel 400 / K500 Weld Neck Flange

Monel 400 / K500 Lap Joint Flange

Monel 400 / K500 Long Weld Neck Flange

Monel 400 / K500 Orifice Flange

Monel 400 / K500 Orifice Flange

Monel 400 / K500 Spectacle Blind Flange

Monel 400 / K500 Blind Flange

Monel 400 / K500 Ring Flange

Monel 400 / K500 Ring Flange

Monel 400 / K500 Socket Weld Flange

Monel 400 / K500 Socket Weld Flange

Types of Monel 400 / K500 Flanges

  • Monel 400 / K500 Table Flanges/ SS 304 Flanges
  • Monel 400 / K500 Raised Face Weld Neck Flanges
  • Monel 400 / K500 Threaded Flanges/ SS 304
  • Monel 400 / K500 Raised Face Slip-On Flanges
  • Monel 400 / K500 Socketweld Flanges
  • Monel 400 / K500 Raised Face Blind Flanges
  • Monel 400 / K500 Blind Plate Flanges
  • Monel 400 / K500 Lap Joint Flanges
  • Monel 400 / K500 Flanged Buttweld
  • Monel 400 / K500 Spectacle Blind
  • Monel 400 / K500 Loose Flanges Manufacturer
  • Monel 400 / K500 Orifice Flanges
  • Monel 400 / K500 DIN Flanges/ SS 304 Flange
  • Monel 400 / K500 AS 4087 Water Flanges
  • Monel 400 / K500 ANSI Class 150 Flanges
  • Monel 400 / K500 ANSI Class 300 Flanges
  • Monel 400 / K500 ANSI Class 600 Flanges
  • Monel 400 / K500 ANSI Class 900 Flanges
  • Monel 400 / K500 ANSI Class 1500 Flanges
  • Monel 400 / K500 ANSI Class 2500 Flanges
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  • Monel 400 / K500 Screwed Flanges
  • Monel 400 / K500 Ring Type Joint Flanges
  • Monel 400 / K500 Ring Flange/ SS 304 Flanges

Monel 400 / K500 Flange Chemical Composition

Element Monel 400 (UNS N04400) % Monel K500 (UNS N05500) %
Nickel (Ni) 63.0 min 63.0 min
Copper (Cu) 28.0 – 34.0 27.0 – 33.0
Iron (Fe) 2.5 max 2.0 max
Aluminum (Al) - 2.30 – 3.15
Titanium (Ti) - 0.35 – 0.85
Manganese (Mn) 2.0 max 1.5 max
Carbon (C) 0.3 max 0.25 max
Silicon (Si) 0.5 max 0.5 max
Sulfur (S) 0.024 max 0.01 max

Monel 400 / K500 Flange Mechanical Properties

Property Monel 400 (Annealed) Monel K500 (Age Hardened)
Tensile Strength (Min) 480 MPa (70,000 psi) 965 MPa (140,000 psi)
Yield Strength (Min) 195 MPa (28,000 psi) 690 MPa (100,000 psi)
Elongation (Min %) 35% 20%
Hardness (Typical) 60 - 80 HRB 27 - 32 HRC
Density (g/cm³) 8.80 8.44
Melting Range 1300 – 1350°C 1315 – 1350°C
Magnetic Permeability Slightly Magnetic Non-Magnetic (to -100°C)

Monel 400 / K500 Flanges Ready Stock At Golden Steel Material

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Industrial Locations & Keywords

Industrial Locations & Keywords
Riyadh Industrial Cities (1st, 2nd, 3rd & Sudair)
Jeddah Industrial Cities (1st, 2nd & 3rd)
Dammam Industrial Areas (1st, 2nd & 3rd)
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Yanbu Industrial City
Rabigh Industrial City
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Al Ahsa Industrial City
Madinah Industrial City
Makkah Industrial City
Taif Industrial City
Tabuk Industrial City
Jazan Industrial City
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Flange and valve supplier Saudi Arabia
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