SPECIALTY METAL FLANGES
Industrial Flanges for Critical Applications
MillsForge supplies industrial flanges in nickel alloys, stainless steels, duplex and super duplex stainless steels, alloy steels, carbon steels, and other specialty materials — according to applicable standards, drawings, and project requirements.
Weld Neck · Slip-On · Blind · Socket Weld · Threaded · Lap Joint · Custom Flanges
FLANGE PRODUCTS
Flange Types We Supply
From standard piping flanges to project-specific components, MillsForge supplies flanges in a wide range of materials, pressure classes, sizes, facing types, and dimensional standards.
Weld Neck Flanges
Designed for high-pressure, high-temperature, and critical piping applications.
Slip-On Flanges
Cost-effective flange solutions for general industrial piping systems.
Blind Flanges
Used to close piping systems, pressure vessel openings, and pipeline ends.
Socket Weld Flanges
Compact flange solutions for smaller-size, high-pressure piping systems.
Threaded Flanges
Flanges for applications where welded connections are not required or suitable.
Custom Flanges
Drawing-based and non-standard flanges supplied to customer dimensions and specifications.
MATERIAL OPTIONS
Flange Materials
Nickel Alloys
Inconel 600 · 625 · 718 · 725
Incoloy 800 · 800H/HT · 825
Hastelloy C22 · C276
Monel 400 · K-500
Duplex & Super Duplex Stainless Steels
UNS S31803 · S32205 · S32750 · S32760
Stainless Steels
304/304L · 316/316L · 321 · 347 · 904L
Alloy & Carbon Steels
ASTM A105 · A182 Grades · A350 Grades · A694 Grades
Titanium Alloys
Grade 2 · Grade 5 · Grade 7 · Grade 12
Other grades and customer-specified materials can be sourced according to project requirements.
FLANGE SPECIFICATIONS
Sizes, Classes & Facing Options
Sizes
Standard and project-specific nominal pipe sizes
Pressure Classes
Class 150 · 300 · 600 · 900 · 1500 · 2500
Facing Types
RF · FF · RTJ
Dimensions
ASME · EN · DIN · Customer Drawings
QUALITY & TRACEABILITY
Inspection, Testing & Documentation
Inspection and documentation requirements can be coordinated according to material specifications, customer requirements, and applicable international standards.
Material Identification
Heat Number · Grade · Traceability
Material identification and heat-number traceability can be maintained according to order requirements.
PMI & Dimensional Inspection
PMI · Diameter · Length · Tolerance
Positive material identification and dimensional inspection can be coordinated when required.
Mechanical & Additional Testing
Tensile · Hardness · Impact · Corrosion
Applicable testing can be arranged according to material specifications and project requirements.
Documentation & TPI
EN 10204 3.1 / 3.2 · Inspection Reports · Third-Party Inspection
Material certificates, inspection reports, and third-party inspection can be provided or coordinated according to order requirements.
STANDARDS & SPECIFICATIONS
Flanges to International Standards
ASME B16.5 Flanges
- Size Range: 1/2″–24″ (DN15–DN600), suitable for most piping systems.
- Flange Types: Weld Neck (WN), Slip-On (SO), Socket Weld (SW), Threaded (THD), Lap Joint (LJ), Blind (BL).
- Pressure Ratings: 150# to 2500#, ensuring safe operation under various conditions.
- Facing Options: Raised Face (RF), Flat Face (FF), Ring Type Joint (RTJ), and Male/Female (M/F) for versatile sealing.
- Materials： Carbon steel, alloy steel, stainless steel, nickel alloys — must comply with ASTM/ASME forging standards (e.g., A105, A350, A182, A694).
ASME B16.47 Series A &B Flanges
- Size Range：26″–60″ (DN650–DN1500), designed for large-diameter piping systems.
- Series Options：Series A (formerly MSS SP-44) and Series B (formerly API 605), meeting different design strength and bolt-load requirements.
- Flange Types：Weld Neck (WN), Blind (BL).
- Pressure Ratings：Class 75, 150, 300, 400, 600.
- Facing Options：Raised Face (RF), Ring Type Joint (RTJ).
- Materials：Carbon steel, alloy steel, stainless steel, nickel alloys — must comply with ASTM/ASME forging standards (e.g., A105, A182, A350).
AWWA Flanges
- Size Range：4″–144″ (DN100–DN3600), designed primarily for waterworks, wastewater, and low-pressure industrial piping systems.
- Flange Types (Common Form Types)：Ring Flange (most common), Blind Flange, Hub Flange, Slip-On Flange (less common, depending on fabrication)
- Pressure Ratings (AWWA Service Classes)：Class B – up to 86 psi (0.6 MPa), Class D – up to 175 psi (1.2 MPa), Class E – up to 275 psi (1.9 MPa), Class F – up to 300 psi (2.1 MPa)
- Facing Options：Flat Face (FF), Raised Face (RF)
- Materials：Carbon steel plate – ASTM A36, A516 Gr. 55/60/70, Carbon steel forging – ASTM A105, Stainless steels (for AWWA C228) – ASTM A182 F304, F316
EN 1092-1 Flanges
- Size Range：DN10–DN4000, covering small to large-diameter piping systems in metric standards.
- Flange Types (Common Form Types)：Type 01 – Plate Flange, Type 11 – Welding Neck Flange, Type 12 – Slip-On Plate Flange, Type 13 – Threaded Flange, Type 21 – Loose Flange with Weld-On Plate Collar, Type 34 – Blind Flange
- Pressure Ratings (PN Classes)：PN 2.5, PN 6, PN 10, PN 16, PN 25, PN 40, higher (PN 63, PN 100, PN 160, PN 250, PN 400) also available depending on type.
- Facing Options：Type A – Flat Face (FF), Type B1 / B2 – Raised Face (RF), Type C/D/E/F – Tongue & Groove, Type G/H – Male & Female
- Materials：Carbon steel, alloy steel, stainless steel — manufactured according to EN material specifications, such as: EN 10222-2 (carbon & alloy steel forgings), EN 10222-5 (stainless steel forgings)
Typical grades: P245GH, P280GH, 16Mo3, 13CrMo4-5, 1.4301 (304), 1.4404 (316L) etc.
DIN Flanges
- Size Range：DN10–DN2000, suitable for a wide range of metric piping systems depending on DIN flange series.
- Flange Types (Common Form Types)：
- DIN 2573 / DIN 2576 – Plate Flanges (PN 6 / PN 10)
- DIN 2501 – Flange dimensions (PN 10 / PN 16 / PN 25 / PN 40)
- DIN 2631 / DIN 2632 / DIN 2633 / DIN 2634 / DIN 2635 / DIN 2636 / DIN 2637 / DIN 2638 – Welding Neck Flanges (PN 6 to PN 400)
- DIN 2565 / DIN 2566 – Threaded Flanges
- DIN 2641 / DIN 2642 – Loose Flanges with Weld-On Collar
- DIN 2527 – Blind Flanges
- Pressure Ratings (PN Classes)：PN 2.5, PN 6, PN 10, PN 16, PN 25, PN 40, higher (PN 63, PN 100, PN 160, PN 250, PN 400) also available depending on type.
- Facing Options：Flat Face (FF), Raised Face (RF), Tongue & Groove (T/G), Male & Female (M/F)
- Materials：Carbon steel, alloy steel, stainless steel — manufactured according to EN material specifications, such as: EN 10222-2 (carbon & alloy steel forgings), EN 10222-5 (stainless steel forgings)
Typical grades: P245GH, P280GH, 16Mo3, 13CrMo4-5, 1.4301 (304), 1.4404 (316L) etc.
Additional ASTM, ASME, EN, DIN and customer-specific requirements can be supplied according to project specifications.
CUSTOM FLANGE REQUIREMENTS
Need Flanges to Your Specification?
Send us your material grade, flange type, size, pressure class, facing, applicable standard, quantity, and inspection requirements. We will review your requirements and coordinate a suitable supply solution.
What to include in your RFQ:
Material · Size · Class · Facing · Standard · Quantity · Inspection