Flange Stainless Steel
Stainless steel flanges connect industrial piping systems across nominal sizes from DN10 to DN800 and pressure classes from 150# to 2500#. NOWARUN machines these components from austenitic and duplex stainless steel grades including F304, F316L, 31803 and 32750 to international standards or customer drawings. Flange types include welding neck, blind, slip on, lap joint, socket weld, threaded and spectacle blind configurations with RF, FF or RTJ facings.
Published Data for Flange Stainless Steel
Every value below is taken from NOWARUN's own specification for this part.
| Nominal Size | DN10 to DN800 |
|---|---|
| Pressure Class | 150# to 2500# (150 to 2500 lbs) |
| Types | Welding neck, blind, slip on, lap joint, socket weld, threaded, spectacle blind |
| Facings | Raised Face (RF), Flat Face (FF), Ring Type Joint (RTJ) |
| Materials | F304, F304L, F316, F316L, 31803, 32750, 347H |
| Standards | ANSI B16.5, ANSI B16.47, ASTM A182, DIN, EN 1092, GOST 33259, SABS 1123, Non Standard |
| Certifications | ISO, PED |
| Packaging | Plywood case or pallets |
| Origin | Zhejiang, China |
Key Benefits
- Covers pressure classes from 150# to 2500# for both low pressure lines and severe service piping
- Available in sizes from DN10 to DN800 to match standard metric and imperial pipeline diameters
- Supplied in austenitic and duplex alloys like F304L, F316L, 31803 and 32750 for corrosion resistance
- Manufactured to ANSI, ASME, DIN, EN 1092, GOST 33259, SABS 1123 or custom prints
- Multiple facing options including raised face, flat face and ring type joint ensure gasket compatibility
- Certified according to ISO and PED requirements for pressurized equipment and piping project construction
Problems It Solves
- Sourcing delays when projects require both standard ANSI flanges and non standard drawing specific dimensions
- Corrosion failures in standard carbon steel lines solved by upgrading to duplex or 300 series alloys
- Mating issues between imperial ASME equipment and metric DIN or GOST pipeline specifications
- Gasket sealing failures caused by mismatched flange facing profiles like RF, FF and RTJ
Who It Is For
- Piping engineers designing process infrastructure to ASME, DIN or EN flange standards
- Procurement specialists sourcing duplex and stainless steel flanges for industrial piping projects
- OEM machine builders needing custom flange connections machined directly to equipment drawings
- Industrial piping contractors requiring pressure rated blind and welding neck flanges under PED certification
Application Scenarios
- Piping project construction requiring pressure rated connections across varying nominal pipe sizes
- Process fluid lines in food processing or machine construction exposed to corrosive media
- High pressure flow systems operating between 150# and 2500# that require RTJ joint sealing
- Piping tie-ins and maintenance shutdowns where blind or spectacle blind flanges are needed for line isolation
- Custom equipment manifolds built to non standard bolt circles and customer drawing dimensions
Technical Features
- Flange types cover welding neck, blind, slip on, lap joint, socket weld, threaded and spectacle blind
- Pressure ratings span from 150# up to 2500# across standard and heavy wall designs
- Facing styles include raised face, flat face and ring type joint to match gasket specifications
- Standard compliance spans ANSI B16.5, ANSI B16.47, ASTM A182, EN 1092, GOST 33259 and SABS 1123
- Non standard connection geometries and bespoke bolt circles machined to customer drawing
Materials
- F304 and F304L stainless steel for general corrosion resistance in process piping
- F316 and F316L stainless steel for improved resistance to chlorides and acidic environments
- 31803 duplex stainless steel providing higher mechanical strength and pitting corrosion resistance
- 32750 super duplex stainless steel for severe aggressive media and higher operating stresses
- 347H stabilized austenitic stainless steel for high temperature piping installations
How It Is Made
- 1
Raw material selection and verification to ASTM A182 chemistry and mechanical standards
- 2
Precision flange body turning and face profile machining to RF, FF or RTJ specifications
- 3
Bolt hole drilling and threading or bore preparation to drawing dimensions
- 4
Surface inspection, facing phonographic finish checking and dimensional verification
- 5
Marking with size, pressure class, material grade and standard compliance
- 6
Packing into export plywood cases or palletizing for sea freight
Quality Control
- Dimensional tolerance inspection according to standard specifications or customer drawings
- Flange face surface and groove verification for RF, FF and RTJ gasket seating
- Material compliance verification against ASTM A182 grade requirements
- Compliance tracking under ISO and PED quality system management
Customization Options
- Machined to customer drawings for non standard bolt circles, overall diameters and thicknesses
- Material selection tailored across 300 series austenitic stainless and duplex alloy grades
- Choice of end connection types including threaded, socket weld, welding neck and slip on
- Custom facings supplied in flat face, raised face or ring type joint geometries
Compared With the Alternatives
| Alternative | Honest trade off |
|---|---|
| Carbon steel flanges | Stainless and duplex grades resist corrosive fluids and eliminate external painting, but raw material costs are higher |
| Slip on flanges | Welding neck flanges handle higher cyclical stresses up to 2500#, though slip on designs require less fit up preparation |
| Flat face (FF) connections | Raised face and RTJ profiles provide higher sealing pressure on the gasket, but require precise alignment to avoid flange deformation |
Use Guide
- Identify the required pipe nominal diameter between DN10 and DN800
- Select the pressure class from 150# to 2500# to suit line design operating pressures
- Specify the connection configuration such as welding neck, blind, slip on or threaded
- Match the flange facing to your gasket type using RF, FF or RTJ profiles
- Provide customer prints for any non standard bore, outer diameter or bolt hole configuration
Flange Stainless Steel Questions
What flange standards can you manufacture to?
We produce flanges to ANSI B16.5, ANSI B16.47, ASTM A182, DIN, EN 1092, GOST 33259, SABS 1123 as well as non standard customer drawings.
What size and pressure ranges are available?
Sizes range from DN10 to DN800, with pressure classes available from 150# to 2500#.
What stainless steel grades can be supplied?
Available grades include austenitic stainless steels F304, F304L, F316, F316L, 347H, and duplex steels 31803 and 32750.
What flange facings do you machine?
We machine raised face (RF), flat face (FF) and ring type joint (RTJ) facings to match your gasket design.
What quality certifications apply to these flanges?
Manufacturing processes are certified under ISO and PED quality standards.
How are the flanges packaged for shipping?
Flanges are packed in export plywood cases or secured on pallets to prevent transport damage.
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