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347H Stainless Steel Seamless Pipe ASTM A312 DN10-DN400

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347H Stainless Steel Seamless Pipe ASTM A312 DN10-DN400

Name: 347H Stainless Steel Seamless Pipe ASTM A312 DN10DN400
Brand: DELTA
Price: 5 USD

Quality 347H Stainless Steel Seamless Pipe ASTM A312 DN10-DN400 for sale

Brand Name : DELTA

Model Number : 347

Certification : ISO

Place of Origin : China

MOQ : 500 kgs

Price : 5-8 USD/Kg

Payment Terms : L/C,T/T,Western Union

Supply Ability : 3 Ton per week

Delivery Time : 5 - 12 days based on the quantity

Packaging Details : standard packing for export

Products : Stainless Steel Seamless Pipe

Grade : 347

Diameter : DN10 - DN400

Length : 6m or custom cutting any length as request

Standard : ASTM EN

Service : Cutting

Loading Port : Shanghai Port

Thickness : 4.0 - 50.0mm

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SMLS Stainless Steel Pipe Tube Alloy TP347H ASTM A312 Alloy OD89MM 108MM 168MM 219MM

Products Specification

Products Name	347 Stainless Steel Seamless Pipe
Grade:	304 304L 309S 310S 314 316L 316Ti 321 329 347H 410 2205 2507 S32760 904L 254SMO and equal grade in GB JIS EN DIN Standard
Standards:	ASTM A213M-94b ASTM A249M-94a ASTM A269-94a ASTM A312M-94b,ect.
	DIN 17456-85 DIN 17458-85 DIN 17459-92.ect
	JIS G3446-1994 JIS G3448-1997 JIS G3459-1997 JIS G3463-1994,ect.
	GB13296-1991 GB14975-2002 GB14976-2002,ect.
Size:	ND5 - DN400
Length:	6m length or cutting any length as request
Applications:	fluid and gas transport, structure , boiler, heat exchanger, super heater

347H stainless steel is a high-performance austenitic stainless steel alloy, renowned for its exceptional high-temperature strength and resistance to intergranular corrosion. Its unique composition, particularly the addition of niobium (Nb), stabilizes the material by preventing carbide precipitation at grain boundaries, making it ideal for demanding industrial environments involving elevated temperatures and corrosive conditions.

Chemical Composition

The precise alloying elements in 347H stainless steel are as follows:

Element	Content Range (%)	Purpose
Chromium (Cr)	17.0 – 19.0	Enhances corrosion resistance and oxidation resistance at high temperatures.
Nickel (Ni)	9.0 – 13.0	Stabilizes the austenitic structure, improving ductility and toughness.
Niobium (Nb)	≥ 5 × C (min)	Prevents carbide precipitation (sensitization), enhancing intergranular corrosion resistance.
Carbon (C)	0.04 – 0.10	The "H" designation indicates higher carbon content, boosting high-temperature strength.
Manganese (Mn)	≤ 2.0	Aids in deoxidation and improves hot workability.
Silicon (Si)	≤ 1.0	Enhances oxidation resistance and acts as a deoxidizer.
Phosphorus (P)	≤ 0.045	Controlled to minimize brittleness.
Sulfur (S)	≤ 0.030	Reduces hot cracking during welding when kept at low levels.

Mechanical Properties

347H exhibits robust mechanical performance, especially under high-temperature conditions:

Property	Minimum Value	Testing Condition
Tensile Strength	515 MPa (75,000 psi)	Room temperature
Yield Strength (0.2% offset)	205 MPa (30,000 psi)	Room temperature
Elongation (in 50 mm)	40%	After annealing
Hardness (HRB)	95 (max)	Room temperature

Key Characteristics & Advantages

High-Temperature Stability: Maintains strength and structure at temperatures up to 816°C (1500°F), resisting creep and oxidation.
Corrosion Resistance: Niobium stabilization prevents sensitization (carbide formation at grain boundaries), even after welding, reducing intergranular corrosion risk.
Weldability: Suitable for most welding processes (e.g., TIG, MIG) without significant loss of mechanical properties.
Formability: Can be cold-worked (e.g., bending, rolling) and hot-formed (e.g., forging) with proper process control.

Typical Applications

347H stainless steel is widely used in industries requiring both heat resistance and corrosion resistance:

Industry	Applications
Power Generation	Boiler tubes, superheaters, reheaters, and high-pressure steam pipelines.
Petrochemical	Refinery equipment, catalytic crackers, and high-temperature process piping.
Chemical Processing	Reactors, heat exchangers, and pipelines handling corrosive fluids.
Aerospace	Exhaust systems and high-temperature structural components.

347H Stainless Steel Seamless Pipe ASTM A312 DN10-DN400

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