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ASME SA266 Gr.2N Heat Exchanger Tubesheet | ASME Sec VIII Compliant

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ASME SA266 Gr.2N Heat Exchanger Tubesheet | ASME Sec VIII Compliant

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

MOQ : 1pc

Price : Negotiable

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

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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.


ASME SA266 Gr.2N Heat Exchanger Tubesheet | ASME Sec VIII Compliant


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.


ASME SA266 Gr.2N Heat Exchanger Tubesheet | ASME Sec VIII Compliant


Product Tags:

EN10028 Heat Exchanger Components Tube

      

1.4541 Heat Exchanger Components Tube

      
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