Nascent Fittings Inc.·Duplex Steel
Duplex Steel LAPPED JOINT FLANGE
Weld neck, slip-on, blind, socket weld & lap joint flanges in SS, CS, alloy, duplex & nickel. ASME B16.5/B16.47, Class 150–2500, MTCs & export.
- Material
- Duplex Steel
- Grades
- F51
- Corrosion
- Excellent
About
Duplex Steel Flanges
Product overview combined with Duplex Steel material context for project selection.
Our integrated facilities include facilities for cutting, forging, ring rolling and machines with CNC lathes, CNC drilling, high capacity forging press and mobile manipulator for making big diameter forged round bars. We also have an in-house heat treatment shop and well equipped laboratory facilities for ensuring the quality of our products.
Manufacturing note
Lap Joint Pipe Flanges are available in variety of material grades, sizes, and specifications to meet our clients’ requirements. Featuring a two-piece design, lap joint flanges require butt welding of the stub end to the pipe or fitting with the use of a backing flange to create the flanged connection. This design makes this style popular for use in systems with limited physical space or systems which require frequent dismantling and maintenance. There are several materials available for lap joint flanges, including Carbon Steel, Alloy Steel, Stainless Steel, Hastelloy, Inconel, Monel and duplex Steel. Lap Joint Flanges have all the same common dimensions as any other flange named on this page however it does not have a raised face. These flanges are nearly identical to a Slip On flange with the exception of a radius at the intersection of the flange face and the bore to accommodate the flanged portion of the Stub End. Their pressure-holding ability is little, if any, better than that of Slip On flanges and the fatigue life for the assembly is only one tenth that of Welding Neck flanges.
Typical applications
- Oil & Gas
- Petrochemical
- Chemical Processing
- Power Generation
- Marine
- Desalination
Configurations
Duplex Steel Flanges types
Open a type for drawings-aligned specifications.
Duplex Steel BLIND FLANGE
Duplex Steel LAPPED JOINT FLANGE
Duplex Steel LONG WELDNECK FLANGE
Duplex Steel NIPO / WELDO FLANGE
Duplex Steel ORIFICE FLANGE
Duplex Steel REDUCING FLANGE
Duplex Steel SCREWED / THREADED FLANGE
Duplex Steel SLIPON FLANGE
Duplex Steel SPACEER & PADDLE FLANGE
Duplex Steel SPECTACLE BLIND FLANGE
Duplex Steel WELDNECK FLANGE
Material scope
Duplex Steel specification
Dimensional and grade range typically supplied for LAPPED JOINT FLANGE in this material.
- Class
- 150# , 300#, 400#, 600#, 900#, 1500#, 2500#
- Grade
- Duplex Steel: ASTM A 182 F -51, F 53, F 55
- Grade
- Copper Nickel: C70600(90:10), C71500(70:30), C71640
- Grade
- Hastelloy: UNS N10276, N06022, N10665, N06455,
- Grade
- Aluminium: ASTM B247, B361 – 2024, 6061, 6063, 6101, 7075.
- Grade
- Titanium: ASTM B381 – Grade 1, Grade 2, Grade 4, Grade 5, Grade 6, Grade 7, Grade 9, Grade 19, Grade 23
- Services
- Hot Dip Galvanizing, Sand Blasting, Special Threading.
- Dimensions
- ANSI/ASME B 16.5, B16.47, B16.36, DIN Standard, JIS Standard, EN1902-1 Standard, UNI Standard, BS10 Standard, BS4504 Standard, API Standard etc.
- Dimensions
- ANSI/ASME B 16.5, B16.47, B16.36, DIN Standard, JIS Standard, EN1902-1 Standard, UNI Standard, BS10 Standard, BS4504 Standard, API Standard etc.
- Dimensions
- ANSI/ASME B 16.5, B16.47, B16.36, DIN Standard, JIS Standard, EN1902-1 Standard, UNI Standard, BS10 Standard, BS4504 Standard, API Standard etc.
- Dimensions
- ANSI/ASME B 16.5, B16.47, B16.36, DIN Standard, JIS Standard, EN1902-1 Standard, UNI Standard, BS10 Standard, BS4504 Standard, API Standard etc.
- Dimensions
- ANSI/ASME B 16.5, B16.47, B16.36, DIN Standard, JIS Standard, EN1902-1 Standard, UNI Standard, BS10 Standard, BS4504 Standard, API Standard etc.
- Dimensions
- ANSI/ASME B 16.5, B16.47, B16.36, DIN Standard, JIS Standard, EN1902-1 Standard, UNI Standard, BS10 Standard, BS4504 Standard, API Standard etc.
- Dimensions
- ANSI/ASME B 16.5, B16.47, B16.36, DIN Standard, JIS Standard, EN1902-1 Standard, UNI Standard, BS10 Standard, BS4504 Standard, API Standard etc.
- Dimensions
- ANSI/ASME B 16.5, B16.47, B16.36, DIN Standard, JIS Standard, EN1902-1 Standard, UNI Standard, BS10 Standard, BS4504 Standard, API Standard etc.
Duplex Steel grades
Available grades for Flanges
Drawn from the Duplex Steel catalog and this product’s material specification.
F51
UNS S31803
Most common duplex grade.
Also available in
Other materials for this product
View Flanges in another material grade family.
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Material
Alloy Steel
F1 · F5
View
Material
Cupro Nickel
Cu-Ni 90/10 (C70600) · Cu-Ni 70/30 (C71500)
View
Material
Monel
Monel 400 · Monel K500
View
Material
Nickel Alloy
Nickel 200 · Nickel 201
View
Material
Hastelloy
Hastelloy C-276 · Hastelloy C-22
View
Material
Titanium
Grade 1 · Grade 2
View
Material
Stainless Steel
F304 · F304H
View
Material
Carbon Steel
ASTM A234 WPB
View
Material
Low Temperature Carbon Steel
ASTM A420 WPL6
View
Material
Copper
C11000 (ETP) · C12200 (DHP)
View
Material
Copper Alloy
UNS C70600 (Cu-Ni 90/10) · UNS C71500 (Cu-Ni 70/30)
ViewCompliance
Standards & certificates
Specifications and documentation typically referenced for this product line — details from our shared compliance catalog.
Standards
11ASTM A182
ASTMForged or rolled alloy and stainless steel pipe flanges, fittings, valves and parts.
- Scope
- Forged and rolled stainless, alloy and duplex steel components for high-temperature service.
- Applies To
- Flanges, fittings, valves and pressure parts
- Typical Grades
- F304/L, F316/L, F11, F22, F91, F51/F60 and related
DIN Standard
DINGerman Institute for Standardization piping / material norms.
- Scope
- Collective reference for DIN dimensional and material standards used on export and EU projects.
- Applies To
- Flanges, fittings and materials when DIN designation is specified
ASME B16.5
ASMEPipe flanges and flanged fittings through NPS 24.
- Scope
- Pressure-temperature ratings, materials, dimensions, tolerances, marking and testing for pipe flanges and flanged fittings.
- Applies To
- Weld neck, slip-on, blind, socket weld, threaded, lap joint and reducing flanges
- Size Coverage
- NPS ½ through 24
- Class Range
- Class 150 to 2500
ASTM B564
ASTMNickel alloy forgings.
- Scope
- Forged nickel alloy flanges, fittings and similar parts.
- Applies To
- Forged flanges and fittings in nickel alloys
ASTM B861
ASTMTitanium and titanium alloy seamless pipe.
- Scope
- Seamless titanium pipe for corrosive and high-performance service.
- Applies To
- Titanium process piping
ASTM B171
ASTMCopper alloy plate and sheet for pressure vessels, condensers and heat exchangers.
- Scope
- Copper and copper-alloy plate for heat-transfer and pressure use.
- Applies To
- Tube sheets, plates and exchanger components
ASTM A234
ASTMPiping fittings of wrought carbon steel and alloy steel for moderate and high temperature service.
- Scope
- Seamless and welded wrought carbon and alloy steel fittings.
- Applies To
- Buttweld elbows, tees, reducers, caps and related forms
- Typical Grades
- WPB, WP5, WP9, WP11, WP22, WP91
ASTM A420
ASTMPiping fittings of wrought carbon steel and alloy steel for low-temperature service.
- Scope
- Wrought fittings suitable for low-temperature pressure piping.
- Applies To
- Buttweld fittings for cryogenic / LT service
- Typical Grades
- WPL6
EN
CENEuropean Norms for materials, flanges and fittings.
- Scope
- Umbrella reference for EN material and flange standards.
- Applies To
- EU-specified piping materials and PN flanges
IS 1239 Part II
BISMild steel tubes, tubulars and other wrought steel fittings — fittings.
- Scope
- Indian Standard covering wrought steel pipe fittings.
- Applies To
- MS / GI fittings commonly used in Indian utility piping
ASME SA182
ASMEASME equivalent of ASTM A182 for forged stainless and alloy components.
- Scope
- Boiler and pressure vessel code adoption of ASTM A182 material requirements.
- Related
- ASTM A182
Certificates
5EN 10204 3.1
Mill test certificate with inspection by the manufacturer’s authorized inspection representative, independent of manufacturing.
- Type
- Inspection document (MTC)
- Scope
- States chemical analysis, mechanical test results and heat / lot identification for the supplied material.
- Documentation
- EN 10204 Type 3.1
- Benefit
- Provides traceable material evidence required on most industrial RFQs.
NACE MR0175
Materials for use in H₂S-containing environments in oil and gas production.
- Type
- Service / sour-service requirement
- Scope
- Limits hardness, microstructure and material selection for sulfide stress cracking resistance.
- Applies To
- Carbon, alloy and CRA piping products ordered for sour service
- Benefit
- Supports upstream oil & gas projects specifying sour-service compliance.
ISO 9001
Quality Management System certification.
- Type
- Quality Management System
- Scope
- Demonstrates a documented QMS covering process control, traceability and continual improvement across manufacturing and supply.
- Benefit
- Assures buyers of consistent product quality and controlled production practices.
- Issued As
- Third-party accredited certificate
PED
Pressure Equipment Directive compliance for equipment placed on the EU market.
- Type
- Regulatory conformity
- Scope
- Design and conformity assessment requirements for pressure equipment and assemblies in the European Union.
- Benefit
- Enables supply of pressure-rated components into EU projects when PED conformity is required.
- Related
- CE marking / Notified Body routes as applicable
IBR
Indian Boiler Regulations approval for boiler-quality piping materials and components.
- Type
- Regulatory approval
- Scope
- Materials and components intended for use under Indian boiler installations.
- Benefit
- Required for many power and process projects under IBR jurisdiction in India.
Manufacturing
Crafted with care
Workshop and production views for Duplex Steel LAPPED JOINT FLANGE — the same craftsmanship photos from our plant archives, shown in webp.
4 photos
People also ask
Questions about Flanges
Nascent Fittings Inc. answers common buyer questions for this line.
Does Nascent Fittings Inc. manufacture Flanges?+
Yes. Nascent Fittings Inc. manufactures and supplies Flanges for industrial piping projects, with material grades and sizes aligned to project specifications.
Can Nascent Fittings Inc. export Flanges worldwide?+
Yes. We export Flanges globally with standard export packaging, material test certificates, and documentation support for international shipments.
What materials are available for Flanges?+
Flanges is available in carbon steel, alloy steel, stainless steel, duplex, nickel alloys, copper alloys, aluminium, titanium and other project-specific materials as required.
Need pricing for Duplex Steel LAPPED JOINT FLANGE?
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