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Tube 347H

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Special Alloy Pipe

347H is a high carbon modification of alloy 347 stainless steel, primarily designed for elevated temperature applications. It offers improved creep strength and resistance to intergranular corrosion over its non-modified counterpart, making it suitable for use in high-temperature environments such as petrochemical, chemical processing, and power generation industries. Additionally, its enhanced stability against sensitization and weldability further contribute to its utility in various applications requiring durability and reliability under harsh conditions.

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Equivalent grade

UNS S34709

DIN W. Nr. 1.4912

Title ： 347H/ S34709

Available products：plate/sheet, bar/rod, pipe/tube, strip, fittings, wire, forging, fastener, customization

Production standards
Product	ASTM
Plate, Sheet, and Strip	A240，A240M
Stainless Steel Pipes	A312，A312M
Boiler, Superheater, and Heat-Exchanger Tubes	A213，A213M
Bars and Shapes	A276，A276M
Forged Fittings	A182，A182M

Chemical composition

%	C	Si	Mn	P	S	Cr	Ni	Nb
Min	0.04					17	9	0.32
Max	0.1	1	2	0.045	0.03	19	13	1.1

Physical properties

Density	7.98g/cm3
Melting	1398~1427℃

347H material properties

Advantage

1. Enhanced creep strength for high-temperature applications.
2. Improved resistance to intergranular corrosion over standard alloys.
3. Suitable for petrochemical, chemical processing, and power generation industries.
4. Enhanced stability against sensitization for prolonged service life.
5. Excellent weldability for ease of fabrication and assembly.
6. Maintains mechanical properties at elevated temperatures.
7. Versatile for a wide range of demanding industrial applications.
8. Reliable performance in harsh and corrosive environments.

347H Material application areas

347H stainless steel finds extensive application in industries requiring elevated temperature resistance and corrosion resistance. Common application areas include petrochemical plants, refineries, chemical processing facilities, and power generation plants. It is used in equipment such as reactors, heat exchangers, boilers, and piping systems, where its enhanced creep strength, resistance to intergranular corrosion, and stability against sensitization are critical for long-term performance. Additionally, it finds use in various high-temperature components in the aerospace, automotive, and manufacturing sectors where reliability and durability under harsh conditions are essential.

FAQ

Q: Do you accept the third party inspection?

A: Yes absolutely we accept.

Q: Do you provide the samples? Free or Extra?

A: The cost of the samples is according to the value.The cost of the freight is necessary.

Q: Do you have large amount of steel products in stock?

A: Yes , we have a large-scale indoor warehouse with perennial spot stocks totally above 200000 tons.

Q: What is your delivery time and the supply ability?

A:The delivery time normally within 15~28working days,we can supply about 10,000tons every month.

Q: How to order?

A: Buyer sends the enquery --> Buyer gets the quotation --> Order confirmation --> Buyer send the deposit --> Seller prepares goods --> Seller makes the strict inspection --> Buyer Arranges Balance Payment --> packing and delivery

Q: How can you ensure the quality of your product?

A: All products have to go through three checks in the whole manufacturing process,it includes production and Random Testing in warehouse and Before Shipping.

Special Alloy Pipe