AMS4676 ASTM B865 MONEL K500 TUBE SHEET

Product Highlights

• Monel K500 (UNS N05500, EN 2.4375) precipitation‑hardening nickel‑copper alloy forged tubesheet, manufactured per AMS4676 and ASTM B865; strengthened by aluminum‑titanium gamma‑prime precipitates, combining high mechanical strength with excellent nickel‑copper corrosion resistance
• Outstanding seawater, brine, saltwater and non‑oxidizing acid corrosion resistance; excellent resistance to erosion‑corrosion and corrosion‑fatigue under marine, offshore and oil‑gas service conditions
• Base material supplied in solution‑annealed condition; customizable aging heat‑treatment to achieve higher strength and hardness for heavy‑load heat‑exchanger pressure‑bearing applications
• Good machinability for high‑density CNC multi‑spindle deep‑hole drilling; strict control on hole pitch, aperture tolerance and perpendicularity to guarantee reliable tube‑expansion and tube‑to‑tubesheet welding quality
• Fully custom‑produced strictly according to customer CAD drawings; supports fixed‑tubesheet, floating‑head and U‑tube heat‑exchanger configurations
• Compliant with pressure‑vessel forging specifications; third‑party witness inspection (SGS, TUV, BV) is available
• Long‑term reliable performance for offshore seawater coolers, marine heat exchangers, oil‑gas process condensers and salt‑medium chemical heat‑transfer equipment

Product Overview

This Monel K500 forged tubesheet is critical pressure‑bearing component for heavy‑duty shell‑and‑tube heat exchangers. Produced from premium Monel K500 alloy ingot by multi‑direction open‑die upsetting and stretching forging, followed by solution annealing and stress‑relief heat‑treatment to obtain homogeneous full‑thickness metallographic structure, eliminating segregation and internal defects.

The alloy gains higher strength after aging precipitation hardening treatment. After rough machining, full non‑destructive testing and precision CNC deep‑hole drilling for tube‑hole array, the tubesheet is ready for tube bundle assembly via expansion or strength welding. Compared with Monel 400, K500 delivers significantly higher yield and tensile strength while preserving excellent seawater and brine corrosion resistance. Widely used for marine, offshore platform, oil‑gas and chemical heat‑exchanger equipment under corrosive salt‑containing working environment.

Material Grade Characteristics – Monel K500 (UNS N05500 / EN 2.4375)

• Precipitation‑hardening Ni‑Cu alloy with Al and Ti additions; high strength obtained through low‑temperature aging heat‑treatment by forming gamma‑prime Ni₃(Al,Ti) precipitates
• Excellent corrosion‑fatigue and erosion‑corrosion resistance in seawater, brine and salt‑containing media, immune to chloride‑induced stress corrosion cracking
• Good toughness retained at cryogenic temperature, stable mechanical properties within service temperature range up to approximately 480℃
• Acceptable weldability; post‑weld stress relief is recommended, aging treatment shall be performed after welding to restore full strength
• Suitable for heavy‑thickness pressure‑bearing components requiring both high mechanical strength and superior marine corrosion resistance

Chemical Composition (Weight %)

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Mechanical Properties (Solution Annealed Condition, ASTM B865 / AMS4676)

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Related Material Grades

‑ Nickel‑Copper Series: Monel 400, Monel K500 ‑ Nickel‑Base Alloy: Inconel 600, 625, 718, Hastelloy C276, Hastelloy B3 ‑ Titanium Alloy: TA1, TA2 ‑ Duplex Stainless Steel: 2205, 2507 ‑ Austenitic Stainless Steel: 304, 316L, 321 ‑ Alloy & Carbon Steel Forgings: A105, 42CrMo, F22

Key Advantages

1. Precipitation‑Hardening High‑Strength Performance Gamma‑prime precipitates provide much higher strength than Monel 400; solution‑annealed for easy machining, customizable aging treatment to match target strength‑hardness requirements.
2. Superior Marine Corrosion‑Fatigue Resistance Excellent seawater, brine and salt‑medium erosion‑corrosion performance, resistant to chloride stress corrosion cracking; ideal for offshore and seawater cooling heat‑exchanger working conditions.
3. Homogeneous Forged Metallurgical Integrity Multi‑step open‑die forging eliminates internal porosity and segregation; uniform grain flow across full thickness, reliable mechanical properties for heavy‑thickness pressure‑vessel tubesheet.
4. High‑Precision CNC Machining Capacity Stress‑relieved condition minimizes distortion during heavy‑duty multi‑spindle deep‑hole drilling; meets strict tolerance requirements for tube expansion and strength‑weld joints.
5. Pressure‑Vessel‑Grade Traceable Quality Control Full‑batch PMI spectral analysis, 100% NDT inspection, complete material traceability complying with AMS4676 and ASTM B865 for global offshore, oil‑gas and marine projects.

Typical Applications

‑ Offshore platform seawater coolers, marine shell‑and‑tube heat exchangers and condensers ‑ Oil & gas industry brine‑medium process heat‑exchanger core pressure‑bearing components ‑ Desalination plant heat‑exchange equipment and salt‑water processing units ‑ Chemical industry non‑oxidizing acid and salt‑containing medium heat‑transfer equipment ‑ Off‑shore engineering custom pressure vessels with high corrosion‑fatigue requirements ‑ Special heat‑exchanger equipment for marine and coastal heavy‑industrial facilities

Processing Service

We provide integrated heavy nickel‑alloy forging, heat‑treatment and full precision machining services, produce finished Monel K500 tubesheet strictly according to customer CAD/PDF drawings: ‑ Premium Monel K500 alloy ingot selection, multi‑upsetting open‑die forging ‑ Solution annealing, stress‑relief and custom aging precipitation hardening heat‑treatment ‑ Rough turning/milling to remove forging scale and surface defects ‑ CNC vertical lathe, gantry boring‑milling, multi‑spindle deep‑hole drilling for tube‑hole array, bolt holes, sealing grooves and locating steps ‑ Pickling and passivation, anti‑rust protective covering for machined sealing surfaces

We supply custom Monel K500 forged tubesheets for heat‑exchanger and pressure‑vessel manufacturers across marine, offshore, oil‑gas and chemical sectors worldwide.

Quality Assurance

‑ 100% UT Ultrasonic Testing for internal forging flaws complying with ASTM B865 and pressure‑vessel standards ‑ MT Magnetic Particle Inspection for surface crack detection ‑ Tensile test, hardness measurement for mechanical‑property verification ‑ Spectrometer PMI full‑spectrum chemical‑composition analysis for each forging lot ‑ High‑precision CMM dimensional inspection for diameter, thickness, hole pitch and critical tolerances

Mill Test Certificate EN 10204 3.1 can be provided together with shipment documents before delivery. Third‑party inspection witness is available upon request.

Packing & Delivery

Packing ‑ Inner packaging: waterproof anti‑rust plastic film, dedicated protective covers for machined sealing faces and tube‑hole openings to prevent scratch, dust and corrosion ‑ Outer packaging: reinforced fumigated heavy‑duty wooden case or high‑strength steel‑frame crate for long‑distance sea transportation ‑ Custom special packaging available on customer request for oversized and heavy‑weight forgings

Lead Time Normally 35‑55 working days after receipt of advance payment. Exact delivery time depends on forging dimension, thickness, aging heat‑treatment requirement, CNC drilling complexity and third‑party inspection schedule.