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ASME SA213 TP347H / UNS S34709 Stainless Steel Seamless Tube EN 1.4961 Heat Exchanger Tube

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ASME SA213 TP347H / UNS S34709 Stainless Steel Seamless Tube EN 1.4961 Heat Exchanger Tube

Brand Name:	YUHONG
Model Number:	ASME SA213 TP347H Stainless Steel Seamless Tube
MOQ:	1000kgs
Packaging Details:	Ply-wooden Case /Iron Case/ Bundle with plastic Cap
Payment Terms:	L/C,T/T

Detail Information

Product Description

Ratings & Reviews

Detail Information

Place of Origin:

CHINA

Certification:

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

Product Name:

Stainless Steel Seamless Tube

Standard:

ASTM A213, ASME SA213

Material:

TP347H, UNS S34709, 1.4961

OD:

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

End:

Plain End, Beveled End

Highlight:

ASTM A213 TP347H Stainless Steel Seamless Tube, UNS S34709 Heat Exchanger Tube

Product Description

ASME SA213 UNS S34709 / TP347H Stainless Steel Seamless Tube Pickled Annealed Heat Exchanger Tube

ASME SA213 TP347H / UNS S34709 is a Nb-stabilized austenitic stainless steel seamless tube with high-temperature creep strength and sensitization resistance. This material is very common used in heat exchangers. EN 1.4961 is a related European grade, but it has different Cr/Ni chemistry. They can be dual-certified only with tight chemistry control. For ASME work, order and certify to ASME SA213 TP347H UNS S34709 — do not accept EN 1.4961 alone as a substitute.

SCC limits: TP347H resists polythionic acid SCC if properly solution-annealed, but it is not immune to chloride SCC.

When engineers choose TP347H?

High-temperature creep service
Above about 550–600°C, 304H and 316H allowable stresses drop rapidly. TP347H has higher allowable stress in the 500–700°C range, so it can allow thinner walls, higher pressure, or longer life.
Polythionic acid SCC risk
In refinery hydroprocessing, catalytic cracking, and similar units, polythionic acid can form during shutdown. Sensitized 304H/316H can crack. TP347H is stabilized with Nb, so it resists sensitization and is a standard choice.
Welded construction without PWHT
TP347H is often used where post-weld heat treatment is impractical. The Nb stabilization reduces chromium carbide precipitation in the HAZ, lowering sensitization risk.
Long-term exposure to 425–815°C
In this sensitization range, unstabilized grades can form chromium carbides at grain boundaries. TP347H ties up carbon as NbC, maintaining corrosion resistance.
Power plant superheaters/reheaters
For steam temperatures around 540–620°C, TP347H is a common upgrade from 304H/316H when creep strength is limiting.
Cost-effective step below 310H or nickel alloys
If 310H or Alloy 800H is over-specified, TP347H can be a lower-cost alternative — provided chlorides and sulfidation are not severe.

Equivalent Grade OF ASME SA213 TP347H / UNS S34709 Stainless Steel Seamless Tube

JIS	GB	STANDARD	WERKSTOFF NR.	UNS
SUS347H	07Cr18Ni11Nb	SS 347H	1.4961	S34709

Chemistry Composition% of ASME SA213 TP347H / UNS S34709 Stainless Steel Seamless Tube

C	Si	Mn	P	S	Cr	Ni	Nb
0.04-0.10	1.00 max	2.00 max	0.045 max	0.030 max	17.0-19.0	9.0-13.0	8*C-1.1

Mechanical Properties of ASME SA213 TP347H / UNS S34709 Stainless Steel Seamless Tube

Tensile Strength , MPa	Yield Strength, MPa	Elongation, %	Hardness, Rockwell B
515 min	205 min	40 min	92

Do not substitute one for the other without a thorough engineering review.

Using standard 347 where 347H is specified could lead to premature creep failure and rupture under high stress at temperature.
Using 347H where standard 347 is specified is often overkill, may be more expensive, and the coarse grain structure offers slightly lower yield strength at room temperature, which could be a design consideration for fabrication.

The "H" is a specific pedigree for the most demanding high-temperature, high-stress environments in the energy and process industries.

Application

Refinery heat exchangers and furnace tubes
Power plant superheaters and reheaters
Petrochemical steam/gas heat exchangers
High-temperature steam service
Applications needing resistance to polythionic acid SCC

Ratings & Review

Overall Rating

4.0

Based on 50 reviews for this supplier

Rating Snapshot

The following is the distribution of all ratings

5 stars

33%

4 stars

33%

3 stars

33%

2 stars

1 stars

All Reviews

Marcus

Belize Jan 19.2026

Helpful (1)

It's genuine 321H — titanium-stabilized, so no worries about sensitization or intergranular corrosion during welding. Our welder said it welded nicely with no cracking.

B*a

South Africa Dec 9.2025

Helpful (2)

Been running about 6 months now in cyclic service. No leaks, no failures. Heat transfer still where it should be.

Salem

Oman Sep 24.2025

Helpful (2)

We checked a few before installation — wall thickness consistent, roundness good. Welded in without problems.

Tags:

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Fired Heater Parts

Baffle Plate

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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