Detailed Product Introduction

This series only uses 304 stainless steel as raw material, focusing on general light industrial and conventional factory pipeline supporting flanges, which is completely different from multi-grade high-end heavy anti-corrosion flanges, threaded small fittings and permanent butt-weld fittings introduced before. Positioned for mass standardized procurement of medium-low pressure common pipelines, it abandons duplex steel, 904L and high-temperature stabilized special materials with high cost, and takes balanced cost performance and universal environmental adaptability as the core selling point. With multiple flange styles including plate flat welding, slip-on, blind and threaded flanges, it forms a full set of detachable connection solutions for daily factory equipment and conventional fluid pipelines. It meets the basic disassembly, maintenance and sealing requirements of most light industrial projects, and is the most widely used economical flange matching product for general manufacturing factories.
 

Single 304 Grade Exclusive Advantages For General Industry

Different from multi-material mixed flange products targeting harsh chemical and marine environments, 304 is perfectly calibrated for daily light industrial working conditions with obvious comprehensive advantages:

Balanced anti-rust and oxidation performanceStandard 304 austenitic stainless steel forms a dense chromium-rich passivation film on the surface after pickling passivation. It can steadily resist indoor air oxidation, tap water, neutral circulating fluid, workshop dust and mild humid air erosion, and no rust spots will appear under long-term normal temperature operation of general factories. It fully covers all non-salt fog, non-strong acid industrial scenes, avoiding the performance surplus and high cost brought by high-alloy anti-corrosion materials.

Excellent welding and forming workability304 material has outstanding ductility, no cracking during hot forging and cold machining. Flat welding and butt welding flanges can be stably fused with matching 304 seamless/welded pipes without welding hardening or brittle failure. Weld joints will not produce obvious intergranular corrosion under conventional medium-low temperature working conditions, and no complex post-weld heat treatment is required, lowering the technical threshold for factory pipeline construction teams.

Stable mass production consistency and controllable costAs the most mature and mass-produced stainless steel grade in the market, raw material supply is sufficient, and the forging and machining process is highly standardized. Batch differences in flange thickness, sealing surface flatness and bolt hole position are extremely small, and the overall procurement cost is far lower than 316L, duplex steel and heat-resistant stainless steel flanges. It greatly reduces the total material expenditure for large-scale factory pipeline renovation and equipment supporting projects.

No magnetic interference for general mechanical equipment304 maintains non-magnetic state after forging and annealing processing, and will not cause magnetic field interference to ordinary instruments, control cabinets and small precision equipment connected to pipelines, suitable for mechanical supporting pipelines with basic electromagnetic stability requirements.
 

Diverse Flange Types, Detachable Split Sealing Core Feature

Unlike one-piece welded joints that cannot be separated and tiny threaded connectors limited to small bores, this 304 flange set relies on bolt + gasket split sealing structure, with multiple styles to match different installation processes of general industry:

Plate Flat Welding FlangeCost-effective mainstream model for medium-low pressure pipelines. Simple structure, low processing cost, only need lap welding with pipe end during installation. Widely used in factory circulating water, ventilation and low-pressure oil delivery pipelines, the first choice for large-volume ordinary pipeline layout.

Blind Flange (Blind Plate)Used for temporary sealing of pipeline terminals, equipment port blocking and regular pressure testing of pipe networks. Matches all pressure grades of flat welding flanges, convenient for later pipeline expansion and equipment overhaul without cutting pipes.

Threaded FlangeNo hot welding required on site, directly screwed onto threaded steel pipes. Suitable for workshop fire-proof areas, electrical equipment auxiliary pipelines and small instrument branch pipes where open fire welding is prohibited.

Slip-On Welding FlangeBetter stress dispersion than ordinary flat welding flange, slightly higher pressure bearing capacity, applicable to medium-pressure circulation pipelines of food machinery and light chemical equipment.

All types share the core advantage of full disassembly: loosen the bolt group to separate pipes, valves and equipment, which is convenient for internal pipeline cleaning, component replacement and system transformation, solving the maintenance difficulty of integrated welded pipeline joints. The replaceable sealing gasket avoids the whole set of flange replacement caused by local leakage, and the later maintenance cost is much lower than welded integrated connectors.
 

Forging & Precision Machining Process For General Industrial Standards

All 304 flanges adopt integral die forging blanks instead of cast blanks to eliminate internal sand holes, pores and loose structures unique to castings, ensuring stable mechanical strength under long-term pipeline pressure and vibration.Complete production flow: 304 stainless steel bar cutting → high-temperature die forging → stress relief annealing → CNC turning sealing surface → precise drilling bolt holes → full pickling passivation anti-corrosion treatment.The sealing surface adopts standard raised face (RF) design, flat and smooth without burrs, which can closely fit with rubber, PTFE and asbestos gaskets to form a continuous anti-leakage sealing layer. Each finished flange passes dimensional inspection, hardness test and water tightness test one by one to ensure full interchangeability with global standard 304 stainless steel pipes and supporting valves. All technical indicators comply with ASME and domestic general industrial standards, with complete mill test reports provided for factory acceptance and export customs clearance.
 

Classified General Industrial Application Scenarios

Factory indoor circulating water and cooling water pipeline connection joints

Heating, ventilation and waste gas low-pressure pipeline flange matching

Food, beverage and daily chemical machinery equipment medium interface

Mechanical equipment cooling system, hydraulic auxiliary pipeline connecting ends

Municipal park landscape water circulation, public building domestic water pipe fittings

Workshop small low-pressure storage tank, filter and auxiliary equipment flanges
 

Economical Industrial Packaging For Batch Factory Procurement

Specifications of different pressure grades and calibers are sorted and packaged separately. The RF sealing surface is covered with plastic protective cover to prevent scratches affecting sealing effect during transportation; bolt holes are plugged with dust-proof rubber plugs to avoid rust and foreign matter blockage. Small and medium-sized flanges are packed in moisture-proof cartons, large-caliber products are fixed on lightweight wooden pallets with steel belts, wrapped with anti-rust film outside. The packaging balances transportation protection and cost control, suitable for mass wholesale and long-distance land and sea transportation of manufacturing factories. We support fixed-size mass stock supply and small-batch customized thickness processing for factory pipeline renovation projects.

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