Stainless Steel Socket Welding Flange

Technical Specifications

Size Range: 1/2"–3" (DN15–DN80)

ASME Pressure Class: Class 150 to Class 1500

JIS Pressure Ratings: 5K, 10K, and 20K

Available Facing Types:

• Raised Face (RF)

• Flat Face (FF)

• Ring-Type Joint (RTJ)

• Male Face

• Female Face

• Tongue Face (T)

• Groove Face (G)

Applicable Manufacturing Standards: ASME/ANSI B16.5 and JIS B 2220

Available Materials:

• ASTM A182 F304

• ASTM A182 F304L

• ASTM A182 F316

• ASTM A182 F316L

• ASTM A182 F310S

• ASTM A182 F321

• ASTM A182 F347

• SUS304

• SUS304L

• SUS316

• SUS316L

• S31803 Duplex Stainless Steel

• S32205 Duplex Stainless Steel

• S32750 Super Duplex Stainless Steel

• S32760 Super Duplex Stainless Steel

• 904L Stainless Steel

Manufacturing Process: Forging and Precision CNC Machining

Product Marking: LOGO–Size–Pressure Rating–Standard–Material–Heat Number. Additional information can be marked according to customer requirements.

Surface Treatment Options: Degreasing and Cleaning or Pickling

Standard Packaging: Bubble Wrap or Plastic Protection, Wooden Cases, or Pallets

Certificates: GB/T 19001-2016, ISO 9001:2015, and CE documentation for applicable products

Brand: LIANHE

HS Code: 7307210000

Place of Origin: Wenzhou, Zhejiang, China

The final dimensions, pressure class, facing type, material grade, manufacturing standard, testing requirements, and surface treatment should be confirmed according to the intended piping system and mating components.

Pressure Ratings and Standards

Products are available according to ASME/ANSI B16.5 pressure classes from Class 150 to Class 1500. JIS configurations are available in 5K, 10K, and 20K pressure ratings.

ASME Class and JIS K ratings use different dimensional systems and pressure-temperature relationships. They should not be treated as directly equivalent.

The actual allowable working pressure depends on:

• Material grade

• Operating temperature

• Nominal size

• Applicable standard

• Pressure class

• Facing type

• Gasket selection

• Bolting materials

• Transported medium

Customers should specify the complete standard and pressure designation when requesting a quotation, such as ASME B16.5 Class 150 or JIS B 2220 10K.

Facing Options

Raised Face

The Raised Face configuration provides a defined gasket-contact area and is widely used in industrial piping systems. The required surface finish should be selected according to the gasket type and applicable standard.

Flat Face

The Flat Face configuration provides a sealing surface across the full face. Correct gasket dimensions and mating-component compatibility should be confirmed before installation.

Ring-Type Joint

The RTJ configuration uses a precision-machined ring groove and compatible metal ring gasket. Groove dimensions, ring number, gasket material, hardness, and surface condition should be specified according to the applicable standard.

Male and Female Face

Male and female facings use complementary raised and recessed surfaces to align and retain the gasket. Both mating components must be manufactured according to compatible dimensions.

Tongue and Groove Face

Tongue and groove facings use matching projections and recesses to position and protect the gasket. The tongue component must be paired with a compatible groove component manufactured according to the same standard.

Material Options

A wide range of austenitic, duplex, super duplex, and high-alloy stainless steel materials is available.

Austenitic Stainless Steel

ASTM A182 F304, F304L, F316, F316L, F310S, F321, and F347 provide different levels of corrosion resistance, temperature resistance, weldability, and mechanical performance.

Duplex Stainless Steel

S31803 and S32205 duplex stainless steels combine good mechanical strength with improved resistance to chloride stress-corrosion cracking.

Super Duplex Stainless Steel

S32750 and S32760 provide higher strength and enhanced corrosion resistance for demanding chloride-containing and marine environments.

904L Stainless Steel

904L is a high-alloy austenitic stainless steel designed for applications requiring improved resistance to certain aggressive chemical environments.

Material selection should be based on the transported medium, chemical concentration, temperature, pressure, corrosion conditions, welding requirements, and applicable project specifications.

Manufacturing Process

The products are manufactured from stainless steel forgings and finished through precision CNC machining.

The principal manufacturing stages may include:

1. Raw-material verification

2. Billet cutting

3. Heating and forging

4. Heat treatment

5. Rough machining

6. Precision CNC machining

7. Facing and sealing-surface machining

8. Drilling and dimensional processing

9. Surface treatment

10. Testing and inspection

11. Product marking

12. Packaging

The exact manufacturing route depends on the material grade, pressure class, facing type, size, testing requirements, and applicable standard.

Forging helps refine the material structure and supports consistent mechanical properties. Precision CNC machining helps maintain dimensional accuracy, bolt-hole alignment, sealing-face geometry, and compatibility with mating components.

Product Marking and Traceability

Standard markings may include:

• LIANHE logo

• Nominal size

• Pressure class or JIS rating

• Applicable standard

• Stainless steel material grade

• Heat number

• Batch or traceability information

Customer logos, private brands, project numbers, purchase-order references, and other customized markings can be applied according to confirmed requirements.

Heat-number marking supports traceability between the finished product, raw-material certificate, manufacturing records, and inspection documentation.

Surface Treatment

Available surface-treatment options include degreasing and cleaning or pickling.

Degreasing and cleaning help remove machining oil, dirt, and process residues from the finished surface.

Pickling can help remove oxide scale, heat tint, surface contamination, and free iron introduced during forging, heat treatment, or machining.

Additional passivation, polishing, protective coating, or specialized cleaning may be available according to customer and project requirements.

The sealing face should be protected during surface treatment, packaging, storage, and transportation to prevent scratches, dents, corrosion, or other damage that could affect sealing performance.

Product Test Items

Available testing and inspection procedures include:

• Ultrasonic Testing (UT)

• Radiographic Testing (RT), when technically applicable

• Positive Material Identification (PMI)

• Liquid Penetrant Testing (PT)

• Dimensional Inspection

• Surface and Visual Inspection

• Hardness Testing

• Material Certificate Verification

• Marking and Traceability Inspection

The required test methods, acceptance criteria, sampling ratios, and inspection standards should be confirmed before production.

Testing requirements may vary according to the material grade, forging size, pressure class, customer specification, and applicable project standard.

Factory Inspection Reports and Certificates

Inspection reports and supporting quality documents can be supplied according to confirmed order requirements, including:

• Raw-Material Inspection Certificate

• EN 10204 3.1 Material Test Certificate

• Nondestructive Testing Report

• Ultrasonic Testing Report

• PMI Test Report

• Liquid Penetrant Testing Report

• Dimensional Inspection Report

• Hardness Test Report

• Third-Party Inspection Report

• Other project-specific quality documents

Third-party inspection, witnessed testing, or additional documentation can be arranged when confirmed before production.

Product Quality Control

LIANHE operates a quality-management system based on ISO 9001:2015. Production processes are controlled to support material traceability, dimensional accuracy, consistent manufacturing, and documented inspection.

The principal quality-control procedures include:

1. Verifying raw-material grades, heat numbers, dimensions, and material certificates.

2. Conducting PMI testing when required to confirm the alloy grade.

3. Monitoring forging temperature, forming, and heat-treatment processes.

4. Inspecting dimensions during rough and precision machining.

5. Checking sealing-face geometry, surface condition, and finish.

6. Verifying bolt-hole quantity, diameter, position, and alignment.

7. Performing applicable nondestructive and hardness testing.

8. Checking product markings against the order and material certificates.

9. Performing final visual and dimensional inspection before packaging.

10. Verifying quantities, labels, shipping marks, and packaging before dispatch.

Products are approved for delivery after completing the applicable inspection procedures.

Packaging

Each product is protected with bubble wrap or a plastic cover to reduce exposure to dust, moisture, impact, and surface damage.

The products are then packed in wooden cases or secured on pallets according to their size, weight, quantity, and selected transportation method.

Protective covers or separators can be used to protect machined sealing surfaces during storage and international transportation.

Customized wooden cases, pallets, labels, barcodes, customer logos, and other packaging arrangements can be supplied according to confirmed order requirements.

Payment Terms

Our standard payment term is a 30% T/T deposit paid in advance, with the remaining 70% T/T balance paid before delivery.

Specific payment arrangements can be discussed according to the order value, material grade, production requirements, and cooperation conditions.

Available payment methods include:

• T/T bank transfer

• Western Union

• PayPal

• Other mutually agreed payment methods

Shipping Terms

Available Trade Terms: EXW, FOB, CFR, CIF, DDP, and DDU

Available transportation methods include:

• Sea freight

• Land transportation

• Rail transportation

• Truck transportation

• Air freight

• International express service

The shipping method can be selected according to the product weight, package volume, destination, required delivery schedule, and transportation budget.

Shipping costs, transit times, export packaging, and delivery conditions should be confirmed before dispatch.

Brand: LIANHE
Place of Origin: Wenzhou, Zhejiang, China