Yuhong Group Co.,Ltd
| Payment Terms | T/T,L/C |
| Supply Ability | 500 tons/month |
| Delivery Time | depend on quantity |
| Packaging Details | Plywood case/Pallet |
| Product | Heat Exchanger Tubesheet |
| Specification | ASTM SA266 |
| Material | Gr.2N |
| Application | Heat Exchanger |
| Brand Name | YUHONG |
| Model Number | YH-HX-TS-2N |
| Certification | ASME, ABS, GL, DNV, NK, PED, AD2000, GOST9941-81, CCS, ISO 9001-2015 |
| Place of Origin | China |
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Product Specification
| Payment Terms | T/T,L/C | Supply Ability | 500 tons/month |
| Delivery Time | depend on quantity | Packaging Details | Plywood case/Pallet |
| Product | Heat Exchanger Tubesheet | Specification | ASTM SA266 |
| Material | Gr.2N | Application | Heat Exchanger |
| Brand Name | YUHONG | Model Number | YH-HX-TS-2N |
| Certification | ASME, ABS, GL, DNV, NK, PED, AD2000, GOST9941-81, CCS, ISO 9001-2015 | Place of Origin | China |
| High Light | EN10028 Heat Exchanger Components Tube ，1.4541 Heat Exchanger Components Tube | ||
ASME SA266 Gr.2N Heat Exchanger Tubesheet | ASME Sec VIII Compliant
What is ASME SA266 Gr.2N Specification?
The ASME SA-266 Gr.2N specification covers carbon steel forgings used in pressure vessels and heat exchangers, particularly for tubesheets. This material is widely used in shell-and-tube heat exchangers, condensers, and boilers due to its good mechanical properties, weldability, and cost-effectiveness.
The "2N" designation indicates that the material is supplied in the normalized heat-treated condition, which enhances its strength and toughness compared to non-normalized grades.
Chemical Composition (ASME SA-266 Gr.2N)
| Element | Composition (%) |
|---|---|
| Carbon (C) | ≤ 0.25 |
| Manganese (Mn) | 0.60 – 1.35 |
| Phosphorus (P) | ≤ 0.025 |
| Sulfur (S) | ≤ 0.025 |
| Silicon (Si) | 0.15 – 0.35 |
| Nickel (Ni) | ≤ 0.40 (optional for low-temp toughness) |
Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength | 485 – 620 MPa (70 – 90 ksi) |
| Yield Strength (min) | 260 MPa (38 ksi) |
| Elongation (min) | 21% |
| Hardness (Brinell, max) | 187 HB |
Heat Treatment
Normalized (N) to refine grain structure and improve mechanical properties.
Optional Post-Weld Heat Treatment (PWHT) if welding is performed.
Why Use SA-266 Gr.2N for Heat Exchanger Tubesheets?
Advantages
Cost-Effective – More economical than stainless steel or nickel alloy tubesheets.
Good Weldability – Compatible with common welding techniques (SMAW, GTAW, SAW).
ASME Code Compliance – Meets ASME Boiler and Pressure Vessel Code (BPVC), Section VIII for pressure vessels.
Moderate Corrosion Resistance – Suitable for non-severe environments when properly maintained.
Limitations
Not for Highly Corrosive Service – Requires cladding or coatings if exposed to acidic/aggressive media.
Limited High-Temperature Use – Max recommended temperature: ~400°C (750°F).
Galvanic Corrosion Risk – If paired with stainless steel or nickel alloy tubes (e.g., UNS N08810), isolation or cathodic protection may be needed.
Tubesheet Design & Fabrication Considerations
Design Codes & Standards
ASME BPVC Section VIII, Div. 1 or 2 (UG-34 for flat heads/tubesheets).
TEMA (Tubular Exchanger Manufacturers Association) for hole patterns & tolerances.
Tube-to-Tubesheet Attachment Methods
| Method | Description |
|---|---|
| Mechanical Expansion | Tubes are rolled into holes for a tight fit. |
| Seal Welding | Prevents leakage between tube and tubesheet. |
| Strength Welding | Provides structural integrity under high pressure. |
| Explosive Bonding | Used for clad tubesheets (carbon steel + corrosion-resistant layer). |
Machining & Quality Control
Precision Drilling – Hole diameter, pitch, and alignment must meet TEMA standards.
Non-Destructive Testing (NDT) – Ultrasonic Testing (UT), Dye Penetrant (PT), or Radiography (RT) for weld inspection.
Surface Finish – Smooth machining reduces crevice corrosion risk.
Common Applications of SA-266 Gr.2N Tubesheets
Oil & Gas – Heat exchangers in refineries.
Power Plants – Condensers and feedwater heaters.
Chemical Processing – Moderate-temperature exchangers.
HVAC Systems – Industrial cooling applications.
Alternative Materials for Tubesheets
If SA-266 Gr.2N is unsuitable, consider:
SA-266 Gr.3 (Higher strength carbon steel).
SA-516 Gr.70 (Pressure vessel steel).
Stainless Steel (SA-240 Type 304/316) – Better corrosion resistance.
Clad Tubesheets (SA-263/SA-264) – Carbon steel with stainless/nickel overlay.
The ASME SA-266 Gr.2N tubesheet is a reliable and economical choice for moderate-pressure and temperature heat exchangers. Proper material selection, design, and fabrication ensure long-term performance.
Company Details
Business Type:
Manufacturer,Distributor/Wholesaler,Importer,Exporter,Trading Company,Seller,Other
Year Established:
2007
Total Annual:
50M-70M
Employee Number:
50~850
Ecer Certification：
Verified Supplier
Yuhong Group is one of the large scale group company in China, more than 35 years experience in the international market, providing high-quality services to over 3000 customers, end user which like Aramco, Petrobras, Pemex, Petronas, Ecopetro, Petroecuador, …. till now Yuhong Grou... Yuhong Group is one of the large scale group company in China, more than 35 years experience in the international market, providing high-quality services to over 3000 customers, end user which like Aramco, Petrobras, Pemex, Petronas, Ecopetro, Petroecuador, …. till now Yuhong Grou...
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