904L Stainless Steel Hub Blind Flanges
904L Stainless Steel Blind Flanges
904L Stainless Steel Flanges Slip-On
904L Stainless Steel Slip-On Raised Face Flanges
904L Stainless Steel Slip-On Reducing Flanges
904L Stainless Steel Socket Weld Flanges
904L Stainless Steel Lap Joint Flanges
904L Stainless Steel Threaded Flanges
904L Stainless Steel Flat Face Flanges
904L Stainless Steel Spectacle Flanges
904L Stainless Steel Orifice Flanges
904L Stainless Steel Long Neck Flangess
904L Stainless Steel Reducing Flanges

904l Stainless Steel Flat Face Flanges/ FF Flange – FF Flanges are used when the counter-flanges are flat face. Flat Face Flange mainly used in connection to cast iron equipment, valves, and specialties. This flat face flange has a gasket surface in the same plane as the bolting circle face. FF Flange also comes in Slip On Flat Face Flange / SOFF Flange, Flat Face Weld Neck Flange / FFWN Flange.

904l Stainless Steel Raised Face Flanges / RF Flanges – 904L Pipe Flange are the most commonly used flanges. The raised face thickness for 150Class (ANSI 150 RF Flange Dimensions) and 300Class (ANSI 300 Flange Dimensions) are included in the specified flange thickness and for higher rating they are not included in the flange thickness. Raised Face Slip On Flange / Slip On Raised Face Flange / Flange SORF / SORF Flange, Raised Face Weld Neck Flange/ RFWN Flange, Weld Neck Raised Face Flange / WNRF Flange, Raised Face Long Weld Neck Flange, SWRF Flange / Socket Weld Raised Face, BLRF Flange / Blind Raised Face Flange, LWNRF Flange / Long Weld Neck Raised Face Flange.

904l Stainless Steel Male-Female Face Flanges – These pipe flanges are better version of Raised face flanges.

904l Stainless Steel Tongue And Groove Flanges – These pipe flanges are most reliable type of flange joint but are costlier than the other type of flanges.

904l Stainless Steel Reducing Flanges – Reducing flanges are designed for when there is a change in the pipe size. The predominate flange (dimensions) matching the larger pipe size (NPT) but having a smaller bore matching the smaller pipe size (NPT). These flanges normally come in Blind, Slip-On Reducing Flange, Threaded, Reducing Slip On Flange, Reducing Weld Neck Flange and Weld Neck Reducing Flange. They are available in all pressure classes and provide a good alternative to connecting two different sizes of pipe.
Slip On Flange – Slip-on flanges are fitted over the pipe and then fillet welded. Slip-on flanges are easy to use in fabricated applications.
Weld Neck Flange – Weld neck flanges are circumferentially welded at the neck where the integrity of the butt welded area can be easily examined by radiography. The weld neck is therefore, durable in critical applications. WN Flange also includes Long Weld Neck Flange (LWNF).

904l Stainless Steel Socket Weld Flanges – Socket weld flanges are counter-bored to accept the pipe before being fillet welded. The bore of the pipe and flange are both the same to provide good flow characteristics.
Lap Joint Flange / Lapped Flange – Lap Joint Flanges are always used with either a stub end which is butt welded to the pipe with the flange loose behind it. A lap joint is used in low-pressure applications because it is easily assembled and aligned. To reduce costs, these flanges are supplied without a hub.

904l Stainless Steel Blind Flanges – Stainless Steel Blind Flange is round plate which has all of the relevant bolt holes but no center hole, and because of this feature, this flange is used to close off the ends of piping systems and pressure vessel openings. It also permits easy access to the interior of a line or vessel once it has been sealed and must be reopened.

904l Stainless Steel Spectacle Blind Flanges – A spec blind is a combination of a ring spacer and single blind. They are usually permanently installed in a piping system and rotated as needed. Oshwin Overseas is one of the leading Spectacle Blind Flange Manufacturers.

904l Stainless Steel Threaded Flanges – Stainless Steel Threaded Flange is similar to a slip-on flange, but has internal threads. It is normally used for low pressure and not used where temperature or stress is very high. This flange has a raised face.
Orifice Flanges – Orifice Flanges are used with orifice meters for the purpose of measuring the flow rate of either liquids or gasses in the respective pipeline. Pairs of pressure “Tappings”, mostly on 2 sides, directly opposite each other, are machined into the orifice flange.

904l Stainless Steel Flanges  Corrosion Resistance

904L gives good resistance to both organic and inorganic acids.The addition of copper in 904L grade gives excellent corrosion resistance against nickel stainless steels, to sulphuric, phosphoric, acetic acids, hydrochloric acids, etc. It also gives a high resistance to pitting in chloride solutions, an excellent resistance to both crevice and stress corrosion cracking.The 904L is much better than austenitic stainless steels due to the higher alloying of nickel and molybdenum.The high percentage of chromium content in 904L gives and maintains a passive film which protects the material in many corrosive environments.

904l Stainless Steel Flanges  Cold Forming

Cold forming 904L can be done easily. The composition of molybdenum and nitrogen implies more powerful processing equipment may be needed.Most of the time more common methods like cooling with air or water etc are used.

904l Stainless Steel Flanges  Hot Forming

Hot and heat forming should be done after uniform heating.Complete annealing should be done before any hot forming in order to retain maximum ductility and corrosion resistance property. It is very important that the whole process should be done above 1100°C.

904l Stainless Steel Flanges  Machining

The machining of  904L  requires proper care to achieve the expected result. The cutting speed should be slow and proper care should be taken while doing so.

904l Stainless Steel Flanges  Welding

The 904L material should be allowed to cool in between, preferably to below 150°C temperatures. To obtain good welding properties welded condition, filler material shall be used.Because of high thermal expansion, welding must be carefully planned in advance to ensure that distortion of the welded joint can be kept under control.

904l Stainless Steel Flanges  Heat Treatment

The heat treatment should be accompanied by cooling in water or air immediately. This treatment should be applied for both solution annealing and stress relieving from the 904L material.