ASME SB171 C46400 Naval Brass Tubesheet with OD 251mm × THK 32.5mm - Forged Copper Alloy Heat Exchanger Tubesheet for Seawater Service

Yuhong Group: Precision Heat Exchanger Components – From Tubes to Tubesheets

Yuhong Group Co., Ltd. designs and manufactures a comprehensive range of thermal equipment for global industries. Our core offerings include shell and tube heat exchangers, pressure vessels, air coolers, and a complete supply of critical components: finned tube bundles, U-tube bundles, heat exchanger tubesheets, and all related parts – ensuring full support for new projects and maintenance.

Shown in the attached photographs is one of our ASME SB171 C46400 naval brass tubesheets – a forged copper alloy component precision-machined for heat exchanger tube bundle assembly.

Product Focus: Naval Brass Tubesheet – Engineered for Seawater Service

The heat exchanger tubesheet is the critical component that anchors every tube in the bundle, separates the tube side from the shell side, and must withstand both mechanical tube expansion forces and operational pressure/temperature cycling.

Based on the images, this tubesheet exhibits:

• Material: ASME SB171 C46400 (naval brass – copper-zinc-tin alloy)
• Dimensions: OD 251mm × THK 32.5mm (as stamped on the part)
• Manufacturing method: Forged (dense grain structure, no internal porosity)
• Machining: Precision-drilled tube holes with grooves for mechanical tube expansion
• Marking: Full traceability with material grade and heat number (HEAT NO. X65218350)

Why C46400 Naval Brass for Tubesheets?

Key Components That Interface with This Tubesheet

Technical Highlights of Our C46400 Naval Brass Tubesheet

• Dezincification resistant: The tin content prevents selective zinc leaching – the most common failure mode in ordinary brass tubesheets.
• Forged construction: Forging eliminates internal voids and directional weaknesses found in rolled plate – critical for pressure-retaining components.
• Precision machining: Tube holes are drilled to exact diameter tolerances (typically +0.05/-0.00 mm) for consistent tube rolling. Internal grooves (typically 2 or 3 per hole) increase pull-out strength.
• Heat number traceability: Each tubesheet is stamped with material grade, heat number, and inspection identification – full traceability from mill to finished component.
• Galvanic compatibility: C46400 is electrochemically compatible with C44300, C70600, and C71500 tubes – preventing bimetallic corrosion in seawater service.

Knowledge Module: C46400 Naval Brass vs. Other Tubesheet Materials for Seawater Service

When to specify C46400 naval brass tubesheet:

• Cooling water is clean seawater or brackish water (not heavily polluted)
• Velocity is controlled (typically 1.5-2.5 m/s through tubes)
• Ammonia is not present in the water
• You need a cost-effective alternative to copper-nickel for moderate seawater service

Knowledge Module: Tubesheet Thickness – The Critical Design Parameter

The 32.5mm thickness shown in your photograph is a typical dimension for:

Typical groove specification for C46400 tubesheets:

• Groove width: 3-5mm
• Groove depth: 0.3-0.5mm
• Number of grooves: 2 or 3 per hole
• Groove location: 5-25mm from tube-side face

Advantages of Ordering C46400 Tubesheets from Yuhong Group

• Exactly to your drawing: We machine your dimension, hole pattern, groove specification, and bolt hole layout.
• Fast turnaround: Forged blanks are machined typically within 1-2 weeks.
• Any copper alloy: C46400, C70600, C71500, C44300 – all available.
• Component-only or full bundle: We supply just the tubesheet – or the complete U-tube bundle (tubes, tubesheet, baffles, tie rods) assembled.
• Full documentation: Material test certificate (MTC) per EN 10204 3.1, dimensional report, and PMI test report (optional).

Knowledge Module: How to Specify a Replacement C46400 Tubesheet Correctly

To avoid costly mismatches, we need the following information (send any of these):

1. Original tubesheet drawing – best option. We duplicate hole pattern, thickness, OD, and groove locations exactly.
2. Old tubesheet (physical sample) – we can measure, reverse-engineer, and machine a perfect match.
3. Exchanger data sheet – shell ID, tube OD & pitch, gasket details, bolt circle diameter.

Common errors to avoid with naval brass tubesheets:

• Wrong tube hole diameter – too tight and tubes cannot be inserted; too loose and rolled joints leak.
• Missing grooves – tubes will pull out under pressure or thermal cycling.
• Incorrect material – C46400 vs. C44300 vs. C70600 confusion. Always confirm alloy.
• Galvanic mismatch – Do not pair C46400 tubesheet with stainless steel tubes without isolating gaskets (risk of rapid galvanic corrosion).
• Wrong facing type – RF vs. RTJ vs. FF – must match the gasket.

Component-Only Supply – We Also Provide

If you need just parts (not a full exchanger), we supply:

• Heat exchanger tubes – copper alloy (C44300, C70600, C71500) – cut to length, end-prepared for rolling
• Finned tube bundles – for air cooler retrofits and gas-cooling applications
• U-tube bundles – complete with tubesheet, baffles, and tie rods
• Baffles, tie rods, spacers – in naval brass or coated carbon steel
• Channel covers, gaskets, fasteners – complete spare parts packages

Typical Applications for C46400 Tubesheets

Quality Assurance & Documentation

Every C46400 naval brass tubesheet we ship includes:

• Mill Test Certificate (MTC) per EN 10204 3.1 – chemical analysis and mechanical properties
• Dimensional inspection report – OD, thickness, tube hole diameters, groove dimensions
• Heat number stamping – as shown on the part for full traceability
• PMI (Positive Material Identification) – available on request
• Third-party inspection (SGS, BV, TÜV) – at buyer's request

Get a Quotation for Your C46400 Tubesheet

To quote a naval brass tubesheet like the one in your photographs, send the following to jimmy@steelseamlesspipe.com:

• Drawing (PDF, scan, or hand sketch with key dimensions: OD, thickness, tube hole size & pitch, bolt circle)
• Or: send us your old tubesheet for reverse engineering (return shipping arranged)
• Material grade: C46400 (as shown) or other copper alloy
• Quantity required (single piece or production run)

We will respond with a dimensional drawing for approval, price, and delivery schedule – typically within 48 hours.