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Stainless Steel 347/347H Flanges – High-Performance Solutions by Sandvik

At Sandvik, we understand the importance of using high-grade materials for industrial piping systems. Among the wide range of flange options available, Stainless Steel 347/347H Flanges stand out due to their excellent resistance to corrosion and high-temperature performance. Designed for demanding environments, these flanges offer unmatched reliability, especially in heat-intensive applications. Our precision-engineered SS 347 and 347H flanges are trusted across diverse industries for their durability, strength, and resistance to intergranular corrosion.

What is Stainless Steel 347/347H Flanges? These flanges are made from austenitic stainless steel stabilized with columbium (niobium), making them ideal for high-temperature service. The 347H variant is a high-carbon version of 347, enhancing creep strength and structural stability at elevated temperatures. These flanges are widely used in chemical processing, power generation, and high-heat environments due to their ability to resist stress cracking and oxidation. Sandvik manufactures SS 347/347H flanges to meet stringent international standards, ensuring long-term performance and integrity.

Advantages of Stainless Steel 347/347H Flanges are numerous. They offer excellent resistance to corrosion in strongly oxidizing environments, particularly in applications involving nitric acid and other harsh substances. The niobium content provides superior intergranular corrosion resistance. 347H flanges are especially suited for environments where prolonged exposure to high temperatures is common. They also provide good weldability and formability, ensuring ease of installation. With these properties, industries can maintain operational efficiency and reduce downtime caused by corrosion-related failures.

As trusted Stainless Steel 347/347H Flanges Manufacturers, Sandvik delivers flanges that support critical systems across sectors like petrochemical, aerospace, marine, food processing, and pharmaceuticals. Our flanges are engineered to endure high pressure and temperature, making them perfect for heat exchangers, furnace parts, superheaters, and exhaust stacks. The ability to withstand aggressive chemical exposure also makes them ideal for use in acid production plants and refineries.

We are also leading Stainless Steel 347/347H Flanges Suppliers, offering a full inventory of flange types to meet diverse industrial demands. Here are some of the most common types:

Weld Neck Flanges: Designed for high-stress applications, these flanges are ideal for fluctuating temperature and pressure environments.

Slip-On Flanges: Easy to install and weld, suitable for lower pressure systems where frequent maintenance is required.

Blind Flanges: Used to close off pipeline ends, these flanges are critical for inspection and maintenance shutdowns.

Socket Weld Flanges: Excellent for small-diameter high-pressure piping where leakage prevention is a priority.

Threaded Flanges: Ideal for applications where welding is not possible or undesirable, offering quick installation and removal.

Lap Joint Flanges: Used with stub ends, best suited for systems that require frequent dismantling for cleaning or inspection.

Sandvik stands out as one of the top Stainless Steel 347/347H Flanges Stockists, maintaining a ready-to-ship inventory to serve urgent project needs. We ensure timely delivery, competitive pricing, and 100% traceability on all products. Our commitment to quality and customer satisfaction has made us a go-to partner for clients around the globe.

As one of the most reliable Stainless Steel 347/347H Flanges Exporters, Sandvik ships products to over 50 countries. Our global logistics network ensures that our flanges reach you safely and on time. Whether you’re managing a large-scale refinery or a niche pharmaceutical plant, Sandvik is ready to supply high-performance SS 347/347H flanges tailored to your specific requirements.

Specification of Stainless Steel 347/347H Flanges

Stainless Steel Flanges Specification : ASTM A182 / ASME SA182
Dimension Standard : ANSI/ASME B16.5, B 16.47 Series A & B, B16.48, BS4504, BS 10, EN-1092, DIN, etc.
Standard : ANSI Flanges, ASME Flanges, BS Flanges, DIN Flanges, EN Flanges, etc.
Size : 1/2" (15 NB) to 48" (1200NB)
Class / Pressure : 150#, 300#, 600#, 900#, 1500#, 2500#, PN6, PN10, PN16, PN25, PN40, PN64 etc.
Flange Face Type : Flate Face (FF), Raised Face (RF), Ring Type Joint (RTJ)
DIN Flanges : DIN 2527, 2566, 2573, 2576, 2641,2642, 2655, 2656, 2627, 2628, 2629, 2631, 2632, 2633, 2634, 2635, 2636, 2637,2638, 2673.
JIS Flanges : JIS B2220 5K, JIS B2220 10K, JIS B2220 16K, JIS B2220 20K
BS Flanges : BS4504 PN 6, BS 4504 PN 10, BS4504 PN 16, BS4504 PN 25, BS4504 PN 40, BS 4504 PN 64, BS 4504 PN 100, BS 4504 PN 160, BS 4504 PN 250, BS 10, BS Table D, BS Table E, BS Table F, BS Table H.

Equivalent Grades of Stainless Steel 347/347H Flanges

STANDARD UNS WNR. JIS EN
SS 347 S34700 1.4550 SUS 347 X6CrNiNb18-10
SS 347H S34709 1.4961 SUS 347H X6CrNiNb18-12

Chemical Composition of Stainless Steel 347/347H Flanges

C Cr Mn Ni P S Si Cb/Ta
347 0.08 max min: 17.0
max: 20.0 		2.0 max min: 9.0
max: 13.0 		0.04 max 0.30
max 		0.75
max 		min:10x C
max: 1.0
347H min: 0.04
max: 0.10 		min: 17.0
max: 20.0 		2.0 max min: 9.0
max: 13.0 		0.03 max 0.30
max 		0.75
max 		min:10x C
max: 1.0

Mechanical Properties of Stainless Steel 347/347H Flanges

Grade Tensile Strength ksi (MPa) min Yield Strength 0.2% ksi offset ksi (MPa) min Elongation (% in 50mm) min Hardness (Brinell) MAX Hardness (Rockwell B) MAX
347/347H 75
(515) 		30
(205) 		40 201 95