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Everything You Need to Know About Stainless Steel 347/347H Buttweld Fittings – Sandvik

Stainless Steel 347/347H Buttweld Fittings are engineered for demanding industrial applications that require high-temperature resistance, excellent corrosion protection, and superior strength. At Sandvik, we specialize in delivering precision-engineered fittings that perform reliably in the harshest environments. Our 347/347H range is tailored for industries that can’t afford downtime due to material failure. Whether you're in petrochemicals, power generation, or shipbuilding, our fittings are built to last.

But what exactly are Stainless Steel 347/347H Buttweld Fittings? Simply put, these are pipe fittings made from stabilized austenitic stainless steel grades 347 and 347H. Grade 347 includes niobium, which enhances its resistance to intergranular corrosion. Grade 347H, on the other hand, has a higher carbon content, offering better creep strength and performance at elevated temperatures. These fittings are used to permanently join sections of piping, creating a seamless and leak-proof system that stands up to stress, heat, and corrosion.

One major benefit of using Stainless Steel 347/347H Buttweld Fittings is their outstanding resistance to oxidation and heat scaling at temperatures up to 870°C. Their high tensile strength, long service life, and low maintenance requirements make them ideal for high-pressure and high-temperature environments. They also provide better weldability and formability than other steel alloys. This makes them especially useful in critical piping systems where safety and reliability are non-negotiable.

Sandvik is among the top-tier Stainless Steel 347/347H Buttweld Fittings Manufacturers, providing solutions that meet both ASME and ASTM specifications. We ensure our fittings pass stringent quality control procedures so that our customers receive products that exceed industry standards.

Industries that rely heavily on Stainless Steel 347/347H Buttweld Fittings include oil and gas, petrochemical, power generation, food processing, and pharmaceutical manufacturing. In the aerospace sector, these fittings are used for jet fuel lines and hydraulic systems. In power plants, they handle superheated steam without breaking down. Their hygienic properties also make them ideal for dairy and brewery pipelines.

As trusted Stainless Steel 347/347H Buttweld Fittings Suppliers, we offer a full range of fittings in multiple sizes, wall thicknesses, and pressure ratings. Every product is engineered to deliver a tight fit and optimal performance under extreme conditions.

Our product lineup includes:

Elbows: These change the direction of flow in piping systems, available in both long radius and short radius types.

Tees: Used to combine or split flow in a piping system. Equal and reducing variants are available.

Reducers: Help connect pipes of different diameters while maintaining smooth flow transition.

Caps: Seal off the end of a pipeline or a nozzle for future access or testing.

Stub Ends: Used in combination with lap joint flanges, ideal for systems requiring frequent dismantling.

Crosses: Four-way fittings that allow for complex pipeline routing and fluid distribution.

Sandvik stands out as one of the most reliable Stainless Steel 347/347H Buttweld Fittings Stockists, with a ready inventory that supports fast shipping and urgent project requirements. Our global supply chain network ensures consistent availability and competitive pricing.

We are also recognized globally as leading Stainless Steel 347/347H Buttweld Fittings Exporters, with clientele across Europe, the Middle East, Asia, and the Americas. Sandvik takes pride in supplying high-performance piping solutions that meet the evolving demands of modern industries.

If you’re searching for durability, precision, and performance in your pipeline systems, Sandvik’s Stainless Steel 347/347H Buttweld Fittings are your ideal choice. Contact us today to get quotes, technical support, or to place your order.

Specification of Stainless Steel 321/321H Buttweld Fittings

Standards : ASTM, ASME
Designation : A 403, SA 403
Dimension Standard : ASME/ANSI B16.9, ASME B16.28, MSS-SP-43
Grade : Stainless steel Buttweld Pipe Fittings, SS Butt weld
Type : Seamless, Welded
Thickness : Sch 5s, Sch 10s, Sch 40s, Sch 80s, Sch 160s, Sch XXS
Size : 1/2" to 24"
Two Joint / Two Halve Butt weld Fittings Size : 6" to 48"
Types of Butt weld Fittings : Equal Tee, Nipple, Long Radius Elbow, Reducing Tee, Elbows, Swage Nipple, Short Radius Elbow, Reducer, Barrel Nipple, 90 Deg Elbow, Concentric Reducer, Reducing Nipple, 45 Deg Elbows, Eccentric Reducer, Bend, 180 Deg Elbow, End Cap, 1D Elbow, 3D Elbow, Stubend, 5D Elbow, Cap, Piggable Bend, Long Stubend, Tee, Short Stubend, Long Radius Bend

Equivalent Grades of Stainless Steel 321/321H Buttweld Fittings

STANDARD UNS WNR. EN JIS GOST
SS 347 S34700 1.4550 X6CrNiNb18-10 SUS 347 08Ch18N12B
SS 347H S34709 1.4961 X6CrNiNb18-12 SUS 347H -

Chemical Composition of Stainless Steel 321/321H Buttweld Fittings

Element C Cr Mn Ni P S Si Cb/Ta
SS 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
SS 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 321/321H Buttweld Fittings

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