Monel 400 Flanges ASTM B564 UNS N04400 Nickel Copper Alloy Forged Flange for Severe Corrosion Service

Monel 400 Flanges ASTM B564 UNS N04400 Nickel Copper Alloy Forged Flange for Severe Corrosion Service

ASTM B564 Monel 400 (UNS N04400) Nickel Alloy Flanges

ASTM B564 Monel 400 flanges are high-performance forged nickel-copper alloy flanges designed for demanding corrosive environments. With excellent resistance to seawater, hydrofluoric acid, and alkaline media, Monel 400 is widely used in marine engineering, chemical processing, and offshore oil & gas industries.

Manufactured in accordance with ASTM B564 / ASME SB564, these flanges offer reliable mechanical strength and long service life under both oxidizing and reducing conditions.

Material Specification – Monel 400 (UNS N04400)

Monel 400 is a solid-solution nickel-copper alloy with the following typical composition:

• Nickel (Ni): ≥ 63%
• Copper (Cu): 28–34%
• Iron (Fe): ≤ 2.5%
• Manganese (Mn), Silicon (Si): trace elements

This composition provides excellent corrosion resistance, especially in seawater and chemical environments.

Applicable Standards

• Material Standard: ASTM B564 / ASME SB564
• Dimensional Standard: ASME B16.5 / ASME B16.47 / EN 1092-1
• Pressure Ratings: Class 150 / 300 / 600 / 900 / 1500 / 2500
• Size Range: 1/2” to 48” (DN15 – DN1200)
• Flange Types:
  • Weld Neck (WN)
  • Slip On (SO)
  • Blind (BL)
  • Socket Weld (SW)
  • Threaded (TH)
  • Lap Joint (LJ)

Key Properties

• Excellent resistance to seawater and marine atmosphere corrosion
• Strong resistance to hydrofluoric acid and alkalis
• Good resistance to stress corrosion cracking
• High mechanical strength over wide temperature range
• Good weldability and fabrication performance

Applications

Monel 400 flanges are widely used in:

• Offshore oil and gas platforms
• Marine engineering and seawater systems
• Chemical and petrochemical plants
• Heat exchangers and condensers
• Pumps, valves, and pipeline systems
• Desalination and seawater cooling systems

Advantages

• Long service life in highly corrosive environments
• Stable performance in chloride-rich media
• Reduced maintenance and replacement cost
• Reliable sealing performance under pressure conditions

Supply Condition

We supply Monel 400 flanges in various sizes, pressure classes, and facing types including RF, FF, and RTJ, according to customer requirements.

Inspection and testing can be provided upon request, including PMI, UT, RT, and hydrostatic testing.

Inquiry Information Required

To provide accurate quotation, please specify:

• Size (DN / NPS)
• Pressure class
• Flange type
• Facing type
• Quantity
• Standard requirements