Yuhong Group: Complete 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 C70600 copper-nickel tubesheets – a high-performance component precision-machined for seawater and marine heat exchanger applications.
Product Focus: C70600 Copper-Nickel Tubesheet – The Standard 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 C70600 (90/10 copper-nickel alloy)
Key alloy feature: 90% copper, 10% nickel – providing excellent seawater corrosion resistance and biofouling protection
Manufacturing method: Forged or rolled plate (as required for thickness)
Machining: Precision-drilled tube holes with grooves for mechanical tube expansion
Marking: Clear YUHONG GROUP identification with full traceability
Why C70600 (90/10 Copper-Nickel) for Tubesheets?
| Property | Benefit for Tubesheet Application |
|---|---|
| 90/10 Cu-Ni composition | Exceptional resistance to seawater corrosion, pitting, and crevice attack – proven in marine service for decades |
| Biofouling resistance | Copper ions discourage marine growth on tubesheet surface – reduces maintenance |
| Erosion resistance | Withstands high-velocity seawater (up to 3-4 m/s) without impingement damage |
| Galvanic compatibility | Works well with C70600, C71500, and titanium tubes – no bimetallic corrosion |
| ASME SB171 certified | Full traceability to ASME Section II material specifications |
| Proven longevity | 15-20+ years service life in seawater applications |
Key Components That Interface with This Tubesheet
| Component | Material (Typical) | How It Interfaces with the Tubesheet |
|---|---|---|
| Heat Exchanger Tube | C70600 (90/10 Cu-Ni) or C71500 (70/30 Cu-Ni) | Rolled into the tubesheet holes – the tubesheet anchors each tube. |
| U-Tube Bundle | C70600 or C71500 tubes | For U-tube designs, tubesheet is the only anchor point. |
| Shell / Channel Gasket | Compressed fiber, PTFE, or metal-jacketed | Seals against the tubesheet face – prevents cross-leakage. |
| Channel / Bonnet | Carbon steel (coated) or copper alloy | Bolted to the tubesheet; distributes cooling water to the tubes. |
| Finned Tube Bundle (optional) | Copper alloy tube + aluminum fin | Fins start beyond the tubesheet face – for gas-cooling applications. |
| Baffles | C70600 or coated carbon steel | Located downstream; support tubes and direct shell-side flow. |
Technical Highlights of Our C70600 Tubesheet
90/10 copper-nickel alloy: The 10% nickel content provides superior resistance to seawater corrosion, impingement attack, and biofouling – outperforming naval brass and many stainless steels in marine environments.
Forged or rolled plate construction: For thicker tubesheets, we use forged blanks for uniform grain structure; for thinner sections, rolled plate is economical while maintaining full ASME compliance.
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.
Galvanic compatibility: C70600 is electrochemically compatible with C70600 and C71500 tubes – no bimetallic corrosion risk.
Biofouling resistance: The copper content naturally discourages marine growth on the tubesheet face – reducing cleaning frequency.
Full traceability: Each tubesheet is stamped with material grade, heat number, and inspection identification.
Knowledge Module: C70600 vs. Other Tubesheet Materials for Seawater Service
| Material | Best For | Key Advantage | Limitation | |
|---|---|---|---|---|
| C70600 (90/10 Cu-Ni) | Seawater, brackish water, moderate to high velocity | Excellent erosion resistance; long service life; proven performance | Higher cost than naval brass | |
| C71500 (70/30 Cu-Ni) | Very high velocity seawater, naval applications | Maximum strength and erosion resistance | Highest cost among copper alloys | |
| C46400 (Naval Brass) | Clean seawater, moderate velocity, cost-sensitive | Dezincification inhibited; cost-effective | Limited to ~2.5 m/s velocity; not for ammonia | |
| Stainless Steel (316L) | Not recommended for seawater | Good general corrosion resistance | Suffers pitting and crevice corrosion in seawater | |
| Titanium (Grade 2) | Extreme seawater conditions | Unmatched corrosion resistance | Very high cost; difficult to machine |
When to specify C70600 tubesheet:
Cooling water is seawater or brackish water (clean or moderately polluted)
Velocity is moderate to high (2.5-3.5 m/s through tubes)
Long service life is required (15-20+ years)
Biofouling is a concern – copper-nickel resists marine growth
Cost is acceptable for the superior corrosion resistance
Knowledge Module: C70600 Tubesheet – Manufacturing & Inspection
| Process | Description |
|---|---|
| Material sourcing | ASME SB171 certified plate or forging – full traceability to mill |
| Cutting / forming | Laser or plasma cutting of plate; forging for thick sections |
| Heat treatment | Annealing to achieve optimal corrosion resistance and machinability |
| Machining | Precision drilling, grooving, and facing – tube holes to exact tolerances |
| NDE | Penetrant testing (PT) – surface crack detection; ultrasonic (UT) for internal soundness (optional) |
| Marking | Material grade, heat number, inspection stamp – full traceability |
| Documentation | MTC per EN 10204 3.1, dimensional report, PT report |
Typical Applications for C70600 Tubesheets
| Industry | Application | Why C70600 |
|---|---|---|
| Marine / Shipbuilding | Seawater-cooled exchangers, condensers | Excellent seawater resistance; long service life; proven performance |
| Offshore oil & gas | Platform process coolers | Reliable in marine atmosphere and seawater; resists biofouling |
| Power generation (coastal) | Auxiliary cooling water condensers | Handles seawater and brackish water; resists impingement |
| Desalination | Brine heaters, evaporator condensers | Resists chloride attack and high-temperature brine |
| LNG / Cryogenic | Seawater-cooled heat exchangers | Good low-temperature toughness; corrosion-resistant |
Advantages of Ordering C70600 Tubesheets from Yuhong Group
Exactly to your drawing: We machine your dimension, hole pattern, groove specification, and bolt hole layout.
Fast turnaround: C70600 blanks are available; machining typically 2-4 weeks.
Any copper alloy: C70600, C71500, C46400, 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, PMI test report (optional).
Component-Only Supply – We Also Provide
If you need just parts (not a full exchanger), we supply:
Heat exchanger tubes – copper alloy (C70600, C71500, C44300) – cut to length, end-prepared for rolling
Finned tube bundles – copper alloy base with aluminum or copper fins for air cooler retrofits
U-tube bundles – complete with tubesheet, baffles, and tie rods
Baffles, tie rods, spacers – in C70600 or coated carbon steel
Channel covers, gaskets, fasteners – complete spare parts packages
Knowledge Module: How to Specify a Replacement C70600 Tubesheet Correctly
To avoid mismatches, we need the following information (send any of these):
Original tubesheet drawing – best option. We duplicate hole pattern, thickness, OD, and groove locations exactly.
Old tubesheet (physical sample) – we can measure, reverse-engineer, and machine a perfect match.
Exchanger data sheet – shell ID, tube OD & pitch, gasket details, bolt circle diameter.
Common errors to avoid with C70600 tubesheets:
Confusing with C71500 – C70600 and C71500 have different strength and cost; verify alloy.
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.
Galvanic mismatch – Do not pair C70600 tubesheet with stainless steel tubes without isolating gaskets.
Welding precautions – C70600 requires specialized welding procedures; design should minimize welding.
Quality Assurance & Documentation
Every C70600 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 – for full traceability
PMI (Positive Material Identification) – available on request
PT (Penetrant Testing) – surface crack detection – standard
Third-party inspection (SGS, BV, TÜV) – at buyer's request
Get a Quotation for Your C70600 Tubesheet
To quote a copper-nickel 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: C70600 (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.
