Stainless Flanges
Stainless Flanges Manufacturer | Precision Stainless Flanges Manufactured for Global Industrial Applications
As an ISO 9001:2015 certified stainless steel flange manufacturer, we supply precision-engineered, high-performance piping components to global procurement managers, EPC contractors, and stocking distributors.
Our complete line of forged stainless steel flanges strictly complies with international standards, including ASME/ANSI B16.5, B16.47, EN 1092-1, DIN, JIS, and GOST.
Why Global Buyers Choose Stainless Flanges
100% PMI Inspection
Every flange is chemically verified before shipment.
Full Traceability
Each flange carries permanent heat number marking linked to MTC.
Short Production Lead Time
Standard stainless flanges shipped within 7–15 days.
OEM Manufacturing
Customized dimensions, laser marking, packaging and project solutions.
Stainless Flanges Specifications
|
Parameter |
Technical Manufacturing Capability |
|
Product Range |
Plate (PL), Slip-On (SO), Weld Neck (WN), Blind (BL), Lap Joint (LJ), Threaded (TH) |
|
Brand / Manufacturer |
QS Flange |
|
Size Capability |
1/2" to 60" (DN15 to DN1500) |
|
Pressure Ratings |
Class 150, 300, 600, 900, 1500, 2500 |
|
Standard Compliance |
ASME B16.5, ASME B16.47, EN 1092-1, DIN, JIS B2220, GOST 12820 |
|
Core Materials |
Austenitic: SS304/304L, SS316/316L, SS321, SS347H, SS310S Duplex & Super Duplex: SAF 2205 (F51), SAF 2507 (F53/F55), 904L |
|
Flange Facing Type |
Flat Face (FF), Raised Face (RF), Ring Type Joint (RTJ), Tongue & Groove (T&G), M&F |
|
Surface Treatment |
Light Anti-Rust Oil, Passivation, Pickling, Electro-polished (on request) |
|
Value-Added Services |
OEM/ODM Manufacturing, Custom Laser Marking, CNC Beveling, Hardwood Case Packing |
|
Lead Time |
Standard sizes: 7–15 Days |
|
Logistics Ports |
Shanghai, Ningbo, Qingdao, Tianjin Port |
Complete Range of Stainless Steel Flanges
Every piping project has different operating conditions, pressure requirements, and installation methods. We manufacture a comprehensive range of stainless steel flanges to satisfy diverse industrial applications.
Weld Neck Flanges
Designed for high-pressure and high-temperature systems, weld neck flanges feature a long tapered hub that distributes stress evenly throughout the pipe.
Features:
Excellent fatigue resistance
Superior pressure performance
Smooth flow transition
Suitable for critical services
Easy radiographic inspection after welding
Slip On Flanges
Slip-on flanges slide directly over the pipe before welding. Their simple installation and competitive cost make them one of the most commonly selected flange types for medium and low-pressure applications.
Advantages:
Easy pipe alignment
Lower fabrication cost
Fast installation
Suitable for general industrial services
Economical for large-volume projects
Lap Joint Flanges
Lap joint flanges work together with stub ends, allowing flange rotation during installation. They simplify alignment and reduce maintenance time for systems requiring frequent dismantling.
Advantages:
Easy bolt alignment
Reusable flanges
Lower maintenance cost
Suitable for large piping systems
Long Weld Neck Flanges
Long weld neck flanges are engineered for pressure vessels, storage tanks, and heat exchangers where additional reinforcement is required.
Benefits include:
Improved stress distribution
Higher structural rigidity
Reduced weld concentration
Excellent sealing reliability
Stainless Steel Materials Available
We manufacture stainless steel flanges in a wide range of austenitic, duplex, super duplex, and special alloy grades to meet the requirements of various industrial applications. All materials are supplied with full mill test certificates (MTC) and complete heat number traceability.
|
Material Grade |
Standard |
Key Features |
Typical Applications |
|
304 |
ASTM A182 F304 |
Excellent corrosion resistance, cost-effective, good weldability |
Water treatment, food processing, general industrial piping |
|
304L |
ASTM A182 F304L |
Low carbon content for improved weldability and reduced carbide precipitation |
Welded piping systems, chemical plants |
|
316 |
ASTM A182 F316 |
Enhanced resistance to chlorides and chemicals due to molybdenum content |
Marine engineering, chemical processing, pharmaceutical plants |
|
316L |
ASTM A182 F316L |
Superior corrosion resistance with excellent weldability |
Offshore projects, food & beverage, pharmaceutical industries |
|
321 |
ASTM A182 F321 |
Titanium stabilized for improved high-temperature performance |
Heat exchangers, boilers, exhaust systems |
|
347H |
ASTM A182 F347H |
Niobium stabilized with excellent creep resistance at elevated temperatures |
Power plants, refineries, pressure vessels |
|
310S |
ASTM A182 F310S |
Outstanding oxidation and heat resistance |
Furnaces, high-temperature pipelines, thermal processing equipment |
|
904L |
ASTM A182 F904L |
Exceptional resistance to strong acids, pitting, and crevice corrosion |
Sulfuric acid plants, chemical processing, offshore platforms |
|
Duplex 2205 |
ASTM A182 F51 |
High strength with excellent resistance to stress corrosion cracking |
Oil & gas, seawater systems, desalination plants |
|
Super Duplex 2507 |
ASTM A182 F53 |
Superior mechanical strength and corrosion resistance in harsh environments |
Offshore platforms, subsea pipelines, marine engineering |
|
Super Duplex F55 |
ASTM A182 F55 |
Excellent resistance to chloride attack and high mechanical strength |
Petrochemical plants, offshore structures, aggressive chemical services |
|
Custom Alloys |
On Request |
Materials manufactured according to project specifications |
EPC projects, customized industrial applications |
Applications
Applications
Applications: Refineries, upstream offshore drilling platforms, subsea pipelines, LNG terminal piping, and hydrocarbon processing facilities.
Flange Selection: Heavy-duty Weld Neck (WN) and Ring Type Joint (RTJ) flanges in Duplex 2205, Super Duplex 2507, and Grade 316L to combat high pressure and sour gas (H2S) corrosion.
Chemical Processing & Acid Plants
Applications: Fertilizer production, sulfuric/nitric acid storage systems, chemical reactors, and aggressive fluid transfer pipelines.
Flange Selection: Lap Joint and Slip-On flanges in high-alloy grades like 904L and 310S, offering exceptional localized corrosion, pitting, and crevice resistance.
Power Generation & Renewable Energy
Applications: Thermal power plant boilers, nuclear cooling loops, supercritical steam piping, and geothermal energy extraction loops.
Flange Selection: Long Weld Neck (LWN) and custom heavy-wall forged flanges in Titanium-stabilized 321 or Niobium-stabilized 347H to ensure high-temperature creep strength.
Marine & Desalination Engineering
Applications: Shipbuilding, ballast water systems, seawater desalination plants, and marine exhaust scrubbing systems (scrubbers).
Flange Selection: Standard and custom drilling flanges forged from Super Duplex F53/F55, engineered to withstand severe chloride-induced stress corrosion cracking (SCC).
International Standards We Manufacture
Different markets require different flange standards. Our manufacturing capabilities cover the major international specifications, ensuring compatibility with piping systems used around the world.
|
Standard |
Application |
|
ASME B16.5 |
Pipe flanges from NPS 1/2" to 24" |
|
ASME B16.47 Series A |
Large diameter flanges |
|
ASME B16.47 Series B |
Large diameter industrial piping |
|
EN 1092-1 |
European piping systems |
|
DIN |
German industrial applications |
|
JIS B2220 |
Japanese industrial piping |
|
BS |
British standard piping |
|
GOST |
Russian and CIS markets |
Advanced Forging & CNC Machining Infrastructure
Controlled Forging Process
Optimal Grain Flow Alignment: We utilize closed-die and precision ring rolling to refine the austenitic grain structure. This achieves superior fatigue resistance and eliminates internal voids or defects.
High Forging Ratio: Ensures uniform density and isotropic mechanical properties across heavy-wall or large-diameter industrial flanges.
CNC Precision Machining & Sealing Surface Finish
Exact Tolerances: Continuous machining on multi-axis CNC lathes guarantees perfect concentricity, bolt-hole alignment, and strict adherence to ASME/EN dimensional tolerances.
Phonographic Serrated Finish: For Raised Face (RF) flanges, we strictly control the surface roughness to maximize gasket gripping and prevent fluid micro-leakage.
Solution Annealing & Heat TreatmentCarbide Dissolution: All austenitic and duplex grades undergo water-quenched solution annealing to dissolve chromium carbides back into the matrix. This eliminates internal stresses and restores maximum localized corrosion resistance.
Flange Facing Options
Raised Face (RF)
The most commonly used flange facing for industrial piping systems. The raised sealing surface concentrates gasket pressure, providing reliable sealing in medium- and high-pressure applications.
Flat Face (FF)
Designed for low-pressure systems and cast iron equipment where even gasket compression across the entire flange face is required.
Ring Type Joint (RTJ)
RTJ flanges feature a precision-machined groove for metallic ring gaskets. They are widely used in high-pressure and high-temperature environments such as refineries and offshore platforms.
Tongue & Groove (T&G)
This design provides precise gasket positioning and improved sealing stability, making it suitable for demanding operating conditions.
Male & Female (M&F)
The matching raised and recessed faces ensure accurate alignment and protect the gasket during installation, making them ideal for critical service applications.
Factory Capability
|
Capability |
Data |
|
Annual Flange Production |
20,000 Tons |
|
Plate Processing Capacity |
30,000 Tons |
|
Product Size Range |
DN15–DN1500 |
|
Pressure Rating |
Class 150–2500 |
|
Material Traceability |
100% Heat Number Traceability |
|
PMI Inspection |
100% |
|
Mill Test Certificate |
EN 10204 3.1 Available |
|
Export Markets |
Europe, Middle East, Southeast Asia, South America |
|
OEM & Custom Manufacturing |
Available |
Strict Quality Assurance
We operate under a zero-defect quality policy. No flange leaves our facility without passing a multi-stage inspection sequence conducted by certified NDT Level II/III technicians.
Positive Material Identification (PMI Testing)
Handheld XRF analyzers check every single flange to verify exact alloying element counts (Cr, Ni, Mo) before packing.
Ultrasonic Testing (UT)
Performed on high-pressure flanges (Class 600 and above) to detect subsurface laminations, cracks, or inclusions.
Dye Penetrant Testing (PT)
Applied to sealing surfaces and weld prep areas to reveal micro-fissures or surface porosity.
Dimensional & Geometry Verification
Vernier calipers, micrometers, and thread gauges confirm all OD, ID, thickness, and bolt-circle metrics.
FAQ