ASME B16.5 ASTM A182 F304 F304L Slip-On Flange
2. Standard: ASME B16.5 / ASTM A182, standard specification for forged steel pipe flanges and flanged fittings
3. Process: 100% solid-billet industrial forging followed by precise CNC machining of bore diameters and bolt holes
4. Size Range: Slip-On (SO) configurations from 1/2" to 24", covering standard Pressure Classes 150 to 1500
5. Heat Treatment: Program-controlled furnace solution annealing followed by rapid uniform water quenching to stabilize structures
6. Surface Finish: Two-side machined smooth bore with standard stock finish phonographic serrations on the raised face (RF)
7. Application: General utility steam loops, chemical transfer lines, machinery plumbing, and commercial low-pressure grids
8. Service Advantage: Dynamic non-destructive testing (NDT), strictly calibrated bolt hole alignment, full MTC 3.1 provided
9. Packaging: Secure international sea-freight packing with heavy wooden pallets or reinforced plywood dunnage framing
10. Key Advantage: Dual hubless design allows easy slip-over pipe alignment and effortless double-fillet field welding sequences
ASME B16.5 ASTM A182 F304 F304L Slip-On Flange - Premium Forged Stainless Steel Connection Solution for Industrial Piping Systems
Hebei All Trust Steel Co., Ltd manufactures high-performance ASME B16.5 ASTM A182 F304 F304L Slip-On Flange solutions engineered for reliable industrial piping connections. Our dual-certified F304/F304L slip-on flanges are manufactured using precision closed-die press forging and modern CNC machining technology, offering superior dimensional accuracy and corrosion resistance in pressure classes from 150 to 1500.
It has a yearly production capacity of over 15,000 tonnes. All hydraulic tests are 100% and rigorously adhere to worldwide ASTM and ASME standards. Every flange undergoes rigors solution annealing at regulated temperature and quick quenching in water. Our production technique offers the best mechanical qualities and weld integrity for chemical processing, water treatment and general industrial applications.
What Is an ASME B16.5 ASTM A182 F304 F304L Slip-On Flange?
This is a unique forged stainless steel pipe fitting for low to medium pressure applications where easy field installation is required. This design is different from conventional weld neck flanges in that it has a slightly bigger internal diameter to let the pipe end to pass straight through the flange body.
The dual certified F304/F304L material grade offers excellent weldability and corrosion resistance. F304L has a low carbon content which reduces sensitisation during welding and eliminates the possibility of intergranular corrosion in the heat affected zones.
This flange type accommodates double-fillet welding sequences—one internal weld and one external weld—creating a secure mechanical connection. The raised face surface features precision-machined phonographic serrations that enhance gasket sealing performance under standard bolted assembly conditions.
Technical Specifications
| Parameter | Specification Details |
|---|---|
| Manufacturing Standard | ASME B16.5 / ASTM A182 / EN 1092-1 |
| Product Type | Slip-On Flange (SO) / Hubbed Raised Face Configuration |
| Material Grade | F304 / F304L (UNS S30400 / S30403) Dual Certified |
| Production Process | Closed-Die Forging + Ring Rolling + CNC Machining |
| Size Range | 1/2" to 24" (DN15 to DN600) |
| Pressure Class | Class 150 / 300 / 600 / 900 / 1500 |
| Flange Face Type | Raised Face (RF) / Flat Face (FF) / RTJ |
| Heat Treatment | Solution Annealing (1040°C) + Rapid Water Quenching |
| Welding Configuration | Double Fillet Weld (Internal & External) |
| Testing Protocol | UT / PT / Visual Inspection / PMI Verification |
| Quality Certificate | EN 10204 3.1/3.2 MTC / ISO 9001:2015 |
| Third-Party Inspection | SGS / BV / TUV / DNV / ABS Accepted |
| Surface Finish | Machined Smooth Bore with Concentric Serrations |
Core Product Advantages
Premium Forging & Material Excellence
Our ASME B16.5 ASTM A182 F304 F304L Slip-On Flange manufacturing begins with 100% virgin stainless steel billets. We never use recycled scrap materials, ensuring guaranteed nickel and chromium content for consistent corrosion resistance.
The precision closed die forging method produces homogeneous grain structure across the flange body. This production technique improves the mechanical strength and removes the internal porosity problems that are present in cast alternatives.
Dimensional Precision & Quality Control
Every flange undergoes multi-axis CNC machining for bolt hole alignment accuracy within ±0.5mm tolerance. Our computerized drilling tracking system ensures perfect gasket sealing surfaces and simplified field installation.
We perform 100% ultrasonic testing on all forged components to detect subsurface discontinuities. Liquid penetrant testing reveals any surface-breaking defects before final approval.
Each production batch receives full chemical analysis verification using optical emission spectrometry. Positive Material Identification (PMI) confirms exact grade compliance with your specifications.
Versatile Pressure & Size Configurations
You can specify pressure classes from 150 to 1500 to match your system operating parameters. Our production capabilities accommodate both standard and custom dimensional requirements.
The slip-on design simplifies pipe alignment during field assembly. Your welding crews benefit from easier positioning compared to socket weld or threaded alternatives, reducing installation time by up to 40%.
Industrial Applications
Chemical Processing & Petrochemical Systems
The low-carbon F304L chemistry prevents carbide precipitation in welded joints exposed to corrosive organic acids and industrial solvents. Your piping systems maintain integrity in moderate-temperature fluid transfer applications.
Water Treatment & Municipal Infrastructure
Municipal water facilities utilize these flanges in filtration systems, pumping stations, and distribution networks. The austenitic stainless steel composition resists chloride stress corrosion cracking in treated water environments.
Food, Beverage & Pharmaceutical Manufacturing
Sanitary piping systems require non-reactive materials with smooth, cleanable surfaces. Our machined flange finishes meet hygienic design standards for CIP (clean-in-place) processing equipment.
HVAC & Fire Protection Networks
Commercial building systems depend on the ASME B16.5 ASTM A182 F304 F304L Slip-On Flange for chilled water loops and fire suppression piping. The slip-on configuration allows rapid assembly in confined mechanical room spaces.
Manufacturing Process & Quality Assurance
Stage 1: Raw Material Verification
We buy stainless steel billets only from ISO-certified mills with full heat number tracking. Spectrographic examination shows a minimum of 18% chromium and a minimum of 8% nickel before manufacture.
Stage 2: Accurate Forging Processes
The billets are heated and forged in a controlled closed die press to near-net form. The flange geometry in ring rolling operations is improved with a uniform wall thickness distribution.
Stage 3: Heat Treatment Methods
For optimum carbide dissolution, solution annealing cycles are performed at 1040°C (1904°F) in program-controlled furnaces. Rapid water quenching freezes the austenitic microstructure and enhances corrosion resistance.
Stage 4: CNC Machining & Finish
Raised face surfaces are machined to a standard 125 micro-inch finish on multi-axis machining centres. Computerised drilling equipment is used to drill bolt hole designs with accurate pitch circle diameter measurements according to the tables of ASME B16.5.
Stage 5: Non-Destructive Testing
Ultrasound inspection finds internal reflectors greater than 1.6mm. Liquid penetrant testing is used to find surface fractures or laps that are undetectable to the eye.
Stage 6: Finalising Documentation
Each shipment is accompanied with EN 10204 3.1 Mill Test Certificates for chemical composition, mechanical qualities and heat treatment parameters. Your quality records are independently verified to grade by PMI reports.
Packaging & Global Delivery
Export-Grade Protection
Individual plastic face guards are used to avoid surface damage to machined sealing surfaces. Flanges are packed in fumigation free hardwood cases and heavy duty plywood boxes for shipment abroad.
Protected with steel strapping and moisture-barrier covering to prevent against salt corrosion during maritime freight. Our packaging is forklift friendly and may be consolidated in the container without affecting the integrity of the goods.
Effective Logistics Solutions
We provide shipping service from main ports of China including Shanghai, Ningbo, Tianjin, Qingdao, Shenzhen etc. Choose FOB, CFR, CIF or DDP terms according to your import requirements.
Mixed container loading accommodates flanges, fittings, valves, and pipe materials in consolidated shipments. This reduces your freight costs and simplifies customs clearance documentation.
Delivery Performance
Stock orders ship within 3-5 days from our 5,000+ ton rolling inventory. Standard custom orders require 15-20 days for production completion. Large engineering projects receive delivery within 25-30 days with priority scheduling options available.
FAQ
Q: Why dual certification F304/F304L but not F304?
A : Dual certification offers you the strong strength of 304 along with the improved weldability and corrosion resistance of 304L. This inhibits sensitisation during welding of the slip-on’s fillet joints so that your welded connections are resistant to intergranular corrosion in service.
Q：Can an ASME B16.5 Slip-On Flange be used in high-vibration environments?
A：While possible, Slip-On flanges have lower fatigue life than Weld Neck flanges. In high-vibration scenarios, you should specify additional weld NDT and consider periodic inspection protocols to monitor joint integrity.
Q：What is the standard bore for this flange?
A：Unlike Weld Neck flanges, the bore of a Slip-On flange is slightly larger than the outside diameter of the matching pipe. This dimensional difference allows for the 'slip' fit that simplifies your field alignment procedures.
Q：Are these flanges suitable for temperatures above 800°F?
A：F304L is generally limited to 800°F (427°C) because its low carbon content reduces creep strength at extreme temperatures. For higher heat applications, F304 or H grades provide better elevated-temperature mechanical properties for your system requirements.
Q：What marking is required on the flange?
A：Per ASME B16.5 requirements, it must include the manufacturer's name or trademark, material grade (ASTM A182 F304/F304L), pressure class, size, and heat number. This traceability ensures your documentation compliance for project audits and regulatory inspections.
Contact Us
Secure your industrial piping projects with premium ASME B16.5 ASTM A182 F304 F304L Slip-On Flange solutions backed by 15+ years of manufacturing expertise. Request your detailed quotation and technical specifications at info@hballtrust.com today.
