304 Stainless Steel Plate Weld Flange / Flat Flange

   304 Stainless Steel Plate Weld Flange / Flat Flange

This 304 stainless steel slip on plate flange (PL flange) is a common fitting for pipeline connection with Raised Face (RF) sealing surface for welding onto stainless steel pipes. It features excellent acid & alkali resistance, anti-corrosion performance and stable sealing. Manufactured to ASME B16.5 and HG/T20592 standards. Sizes from 1/2"to 24", widely used in water treatment, chemical, food, oil & gas and paper-making projects. Material Test Certificate (MTC) available, non-standard customization is acceptable

Specifications of Custom Stainless Steel Connectors

Manufacturing Capability & Material Range of Custom Stainless Steel Connectors

Key Features

· Full in-house manufacturing with mandrel cold push forming line and complete polishing & finishing equipment

· 100% PMI spectral inspection per batch, full material traceability to original mill heat number

· Dual product lines: industrial heavy-duty pipe fittings + sanitary high-purity hygienic fittings

· Mature special alloy processing technology for severe corrosion & high-temperature working conditions

· Seamless one-piece forming, uniform wall thickness, compatible with orbital welding

· Compliance with full international standards, supported by complete authoritative certifications

· Multiple surface finish options: mechanical polish, mirror polish, electropolishing for sanitary grades

Manufacturing Process

· Raw Tube PMI Spectral & Dimension Inspection

·Precision Cutting & Sizing

· Mandrel Cold Push Forming (one-piece seamless forming)

·End Trimming & Beveling

· Internal & External Polishing (mechanical / mirror / electropolishing)

· Degreasing & High-purity Cleaning (for sanitary grade)

· Semi-finishing Dimensional & Surface Inspection

·Final Quality Control (size, roughness, leakage test)

· Clean Packaging & Delivery

Process Steps

Raw tube PMI and dimension inspection → precision cutting and sizing → mandrel cold push forming → end trimming and beveling → internal and external polishing → degreasing and high-purity cleaning → dimensional and surface inspection → final QC (size, roughness, leakage test) → clean packaging.

Applications

· Dairy: milk, yogurt and cream processing

· Food and beverage: juice, sauce and edible oil

· Brewery: beer and wine fermentation and filling

· Pharmaceutical and biotech: purified water, WFI and liquid medicine

· Cosmetic and personal care: lotion, cream and essence

· Pure water and water treatment: ultrapure water piping

Quality Control

· Material Verification: 100% PMI spectral analysis, chemical composition fully traceable to original mill heat number

· Dimensional Control: High-precision inspection of diameter, wall thickness, bending angle and end flatness

· Surface & Cleanliness: Surface roughness (Ra) test; defect inspection; sanitary grade cleanliness test

· Performance Testing: Sampling pressure & leakage test; ovality & concentricity check

· Third-party Inspection: SGS, BV, TUV witnessed inspection supported

Why Choose Us

· 16+ Years Professional Manufacturer (Founded in 2010, based in Wenzhou, China)

· Full In-house Production Chain: Forming → Polishing → Cleaning → Testing

· Leading Special Alloy Technology: Mature processing of nickel-based, Hastelloy, super austenitic and super duplex steel pipe fittings

· Dual Product System: Industrial heavy-duty pipe fittings + Sanitary high-purity hygienic fittings

· Complete Authoritative Certifications: TS pressure pipe license, ISO 9001/14001/45001, CE-PED, AD2000, EAC

· Full Engineering Support: Working condition analysis, material selection, custom piping solution design

· New Energy Layout: Professional piping solutions for data center liquid cooling, hydrogen energy and energy storage

· Stable & Reliable Delivery: exported to 30+ countries

Available Materials

· Standard Stainless Steel: ASTM A270 / A312 TP304/TP304L, TP316/TP316L, TP321, TP347, 904L

· Super Austenitic & Duplex Steel: Super austenitic steel, SAF 2205, SAF 2507 super duplex steel

· Nickel & Special Alloys: Inconel 600/625/690, Incoloy 800/825/800H, Monel 400, Hastelloy series

· Custom special alloy grades available upon request

Custom Service

· Full custom production per customer drawings, samples or project requirements

· Custom dimensions, bending radius, wall thickness, bevel type and surface finish

· Special material customization: special alloys, sanitary grade materials

· Engineering Support: Working condition analysis, material selection, piping solution design

· Laser marking: logo, part number, batch number, project identification

· Custom export packaging and special protection requirements

· OEM & ODM services

Packaging & Shipping

· Packaging: Export-special wooden cases

· Marking: Custom shipping marks, batch number and material traceability marking

· Shipping: FCL/LCL sea freight, air freight, international express delivery

· Documents: Full set of export documents, MTR reports, certificates and packing lists provided

FAQ:

1：Is this a plate flat welding flange or a weld neck flange?

：Standard type is slip on plate flange (PL/SO), suitable for low-pressure pipe welding. Weld neck flange, blind flange and threaded flange are available upon request.

Q2：The material is 304. Is 316L available? Can you provide material certificates？

：Standard material is SS304. SS316L, 321, 2205 duplex steel are optional. MTC material test certificate can be provided.

Q3：What is the flange face type? Are other flange face types available?

：Standard sealing face is RF (Raised Face). FF, MFM and RJ ring joint face are available for high pressure service.

Q4：What standards do you comply with? Are both ASME and GB standards available?

：We follow ASME B16.5, HG/T20592, also DIN and JIS standards.

Q5：What industries and media are applicable?

：ANSI class: 150, 300, 600; PN rating: PN10, PN16, PN25, PN40. Thickness and bolt layout vary by pressure rating, please confirm before order.

Q6：What are the main industries for application?

：Water treatment, chemical, food & beverage, pharmaceutical, oil & gas, paper, desulfurization pipelines and other corrosion-resistant applications.

Q7：What is the MOQ? Can I get samples?

：Sample orders are acceptable. Common sizes are in stock. Better price for bulk orders, send us your specs or drawing for quotation.

Q8：What is the surface treatment of the flange? Can it be polished?

：Standard finish is machined raw finish. Brushed or mirror polishing is optional for sanitary food & pharmaceutical pipelines.