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Ultimate Guide to Stainless Steel 304/304L/304H Flanges – Applications, Types, and Benefits

Stainless Steel 304/304L/304H Flanges are among the most widely used industrial components in modern piping systems. These flanges are made from austenitic stainless steel alloys, each with slight modifications to serve different pressure and temperature environments. At Sandvik, we specialize in producing and supplying a wide range of these flanges that meet global standards for performance, reliability, and longevity.

So, what is Stainless Steel 304/304L/304H Flanges? Simply put, these are mechanical connectors used to link pipes, valves, pumps, and other equipment within a piping system. SS 304 is the standard "18/8" stainless grade, containing 18% chromium and 8% nickel, offering excellent corrosion resistance and formability. SS 304L is a low-carbon version, ideal for welding applications as it reduces the risk of carbide precipitation. Meanwhile, SS 304H is a high-carbon version specifically designed for high-temperature service.

One major advantage of Stainless Steel 304/304L/304H Flanges is their resistance to oxidation and corrosion in a wide range of industrial environments. These flanges also offer excellent strength, durability, and ease of fabrication. SS 304/304L/304H flanges perform exceptionally in both cryogenic and high-temperature conditions, making them a go-to material for critical applications. Their low maintenance and long service life significantly reduce operating costs over time.

As leading Stainless Steel 304/304L/304H Flanges Manufacturers, Sandvik supplies flanges that are used across a spectrum of industries. In the oil & gas sector, they’re vital for pipeline connections. In chemical plants, their corrosion resistance makes them ideal for transporting reactive fluids. Power generation facilities use them for high-pressure steam lines. Other industries that rely heavily on these flanges include food processing, pharmaceuticals, water treatment, and shipbuilding.

There are several types of Stainless Steel 304/304L/304H Flanges available, each tailored for specific use cases: Weld Neck Flanges: Ideal for high-pressure applications, these flanges are designed to be butt-welded to a piping system, offering excellent stress distribution. Slip-On Flanges: Easy to install and cost-effective, suitable for low-pressure applications. Blind Flanges: Used to seal off pipe ends, valves, or pressure vessel openings. Socket Weld Flanges: Best suited for small diameter, high-pressure piping. Lap Joint Flanges: Used with stub ends, perfect for systems requiring frequent dismantling. Threaded Flanges: Used in applications where welding isn’t possible. Orifice Flanges: Designed to measure the flow rate of liquids or gases.

Sandvik stands out as one of the trusted Stainless Steel 304/304L/304H Flanges Suppliers, offering precision-engineered flanges that meet ASME, ASTM, and international norms. Our products are available in various pressure ratings and dimensions to match diverse client needs. As experienced Stainless Steel 304/304L/304H Flanges Stockists, we maintain a robust inventory, ensuring fast delivery and minimal lead times for domestic and international clients. Our inventory control and quality assurance processes ensure that every flange delivered is ready to perform in the toughest environments. We are also leading Stainless Steel 304/304L/304H Flanges Exporters, shipping our premium-grade products across the globe. Whether it's North America, the Middle East, or Southeast Asia, Sandvik flanges are recognized for their performance, reliability, and compliance with international certifications.

Specification of Stainless Steel 304/304L/304H 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 304/304L/304H Flanges

STANDARD UNS WNR. AFNOR EN JIS BS GOST
SS 304 S30400 1.4301 Z7CN18‐09 X5CrNi18-10 SUS 304 304S31 08Х18Н10
SS 304L S30403 1.4306/1.4307 Z3CN18‐10 X2CrNi18-9 / X2CrNi19-11 SUS 304L 304S11 03Х18Н11
SS 304H S30409 1.4301 - - - - -

Chemical Composition of Stainless Steel 304/304L/304H Flanges

C Mn Si P S Cr Ni N
304 0.07max 2.0max 0.75max 0.045max 0.03max min: 18.0 max: 20.0 min: 8.0 max: 10.5 —
304L 0.03max 2.0max 0.75max 0.045max 0.03max min: 18.0 max: 20.0 min: 8.0 max: 12.0 0.10 max
304H min: 18.0
max:20.0 		min: 8.0
max: 10.5 		min: 0.04
max:0.10 		0.75
max 		2.0
max 		0.045
max 		0.03
max 		0.10
max

Mechanical Properties of Stainless Steel 304/304L/304H Flanges

Grade Tensile Strength ksi (min) Yield Strength 0.2% ksi (min) Elongation % Hardness (Brinell) MAX Hardness (Rockwell B) MAX
304 75 30 40 201 92
304L 70 25 40 201 92
304H 75 30 40 201 92