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Heat Exchanger Tube

ASTM A213 T91 Alloy Steel Seamless Tube J Tube Bends Alloy Steel Heat Exchanger Tube

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ASTM A213 T91 Alloy Steel Seamless Tube J Tube Bends Alloy Steel Heat Exchanger Tube

Brand Name:	YUHONG
Model Number:	ASTM A213 T91 Alloy Steel Heat Exchanger Tube
MOQ:	1000kgs
Packaging Details:	Ply-wooden Case /Iron Case/ Bundle with plastic Cap
Payment Terms:	L/C,T/T

Detail Information

Product Description

Detail Information

Place of Origin:

CHINA

Certification:

ABS, GL, DNV, NK, PED, AD2000, GOST9941-81, CCS, ISO 9001-2008

Product Name:

Heat Exchanger Tube

Standard:

ASTM A213, ASME SA213

Material:

1/4" , 3/8", 1/2", 5/8", 3/4", 1", 1.1/4", Etc.

Thickness:

BWG10-25

Length:

Single Random, Double Random & Cut Length

Plain End, Beveled End

Highlight:

ASTM A213 T91 Alloy Steel Seamless Tube, J Type Bends Heat Exchanger Tube

Product Description

ASME SA213 / ASTM A213 T91 Alloy Steel Heat Exchanger Tube J Tube Bending

T91 is a modified 9Cr‑1Mo steel with controlled additions of vanadium, niobium and nitrogen. ASTM A213 T91 as a high-performance ferritic alloy steel specifically designed for elevated-temperature service in boilers, superheaters and heat exchangers.

A "J‑bend" is a tube formed with a 180° return bend where the two legs are of unequal length, resembling the letter J. This is distinct from a standard U‑bend (equal legs) and is often used in shell‑and‑tube heat exchangers to accommodate thermal expansion, particular nozzle locations, or to simplify tube‑bundle insertion.

Why Choose a J‑Bend Over a U‑Bend?

The primary technical driver is tube‑side flow equalisation. In a conventional U‑tube bundle, tubes with a smaller bend radius have a shorter flow path, leading to:

Lower hydraulic resistance in inner tubes
Preferential flow through inner tubes
Uneven heat transfer and potential overheating of some tubes

A J‑bend allows the designer to make the shorter leg of the inner tube longer, so that the total developed length (straight + bend) is the same for every tube in the bundle. The result is:

Uniform fluid velocity per tube
Balanced temperature profile across the bundle
Reduced risk of local hot spots or flow‑induced vibration

Equivalent Grades of ASTM A213 / ASME SA213 T5 Alloy Steel Seamless Tube

STANDARD	WERKSTOFF NR.	UNS
ASTM A213/ASME SA213 T91	1.4903	K90901

Chemical Compositions of ASTM A213 / ASME SA213 T91 Alloy Steel Seamless Tube

C%	Mn%	P%	S%	Si%	Cr%	Mo%	Ni%	V%	Al%	Nb%	N%
0.07~0.14	0.30~0.60	0.020 max	0.020 max	0.20~0.50	8.0~9.5	0.85~1.05	0.4	0.18~0.25	0.015	0.06~0.10	0.03~0.07

Mechanical Properties ASTM A213 / ASME SA213 T91 Alloy Steel Seamless Tube

Tensile Strength , MPa	Yield Strength, MPa	Elongation, %	Hardness, HB
585 min	415 min	20 min	250 max

ASTM A213/ASME SA213 T2, T11, T12, T22, T91, T92 Alloy Steel Tube Size Tolerance

Outside Diameter	OD Tolerance	WT Tolerance	Ovality Tolerance	Cut Length Tolerance
OD≤ 12, 7 mm	± 0, 13 mm	± 15 %	–	+ 3, 18 mm, – 0 mm
12, 7 mm < OD ≤ 38, 1 mm	± 0, 13 mm	± 10 %	max, 1, 65 mm	+ 3, 18 mm, – 0 mm
38, 1 mm < OD ≤ 88, 9 mm	± 0, 25 mm	± 10 %	max, 2, 41 mm	+ 4, 76 mm, – 0 mm

Application

1. Ultra‑Supercritical (USC) Power Generation

2. Petrochemical & Refining – High‑Temperature Process Exchangers

3. Nuclear – Balance of Plant (Secondary Side)

4. Concentrated Solar Power (CSP) – Molten Salt Systems

5. Chemical & Process Industries – Heat Recovery

6. Boiler

7. Heat Excahnger

Tags:

Studded Tube

Solid Fin Tube

Serrated Finned tube

Embedded G Fin Tube

Extruded Fin Tube

Wound Fin Tube

Low Fin Tube

Square Fin Tube

Longitudinal Finned Tube

Enhanced Heat Transfer Tube

Fin Tube Support

Return Bend

Heat Exchanger Tube

Stainless Steel Heat Exchanger Tube

Duplex Stainless Steel Heat Exchanger Tube

Super Duplex Stainless Steel Heat Exchanger Tube

Nickel Alloy Steel Heat Exchanger Tube

Copper Alloy Steel Heat Exchanger Tube

Titanium Alloy Steel Heat Exchanger Tube

Alloy Steel Heat Exchanger Tube

U Bend Heat Exchanger Tube

Carbon Steel Heat Exchanger Tubes

Boiler Tube

Nickel Alloy Steel Boiler Tube

Stainless Steel Boiler Tube

Duplex Stainless Steel Boiler Tube

Alloy Steel Boiler Tube

Carbon Steel Boiler Tube

Fired Heater Parts

Baffle Plate

Tubesheet

Studded Tube

Solid Fin Tube

Serrated Finned tube

Embedded G Fin Tube

Extruded Fin Tube

Wound Fin Tube

Low Fin Tube

Square Fin Tube

Longitudinal Finned Tube

Enhanced Heat Transfer Tube

Fin Tube Support

Return Bend

Heat Exchanger Tube

Stainless Steel Heat Exchanger Tube

Duplex Stainless Steel Heat Exchanger Tube

Super Duplex Stainless Steel Heat Exchanger Tube

Nickel Alloy Steel Heat Exchanger Tube

Copper Alloy Steel Heat Exchanger Tube

Titanium Alloy Steel Heat Exchanger Tube

Alloy Steel Heat Exchanger Tube

U Bend Heat Exchanger Tube

Carbon Steel Heat Exchanger Tubes

Boiler Tube

Nickel Alloy Steel Boiler Tube

Stainless Steel Boiler Tube

Duplex Stainless Steel Boiler Tube

Alloy Steel Boiler Tube

Carbon Steel Boiler Tube

Fired Heater Parts

Baffle Plate

Tubesheet

products details

Studded Tube

Solid Fin Tube

Serrated Finned tube

Embedded G Fin Tube

Extruded Fin Tube

Wound Fin Tube

Low Fin Tube

Square Fin Tube

Longitudinal Finned Tube

Enhanced Heat Transfer Tube

Fin Tube Support

Return Bend

Heat Exchanger Tube

Stainless Steel Heat Exchanger Tube

Duplex Stainless Steel Heat Exchanger Tube

Super Duplex Stainless Steel Heat Exchanger Tube

Nickel Alloy Steel Heat Exchanger Tube