Professional Wholesale OEM BS, ANSI, JIS, DIN 304L Stainless Steel Forged Weld Neck/Slip on/Blind/Sight Glass Forged Ss Welding Pipe Joint Flange Factory Price

• Customization: Available
• Standard: ANSI, DIN, GB, JIS, GOST, BSW
• Type: Welding Flange
• Model NO.: Necked Flat Welding Flange
• Material: Stainless Steel
• Structure: Flanges
• Connection: Welding
• Sealing Surface: RF
• Manufacturing Way: Forging
• Flange Type: So Flange
• Executive Standard: En DIN
• Payment Way: T/T
• Shipping Way: Sea Air Land
• Transport Package: Wooden Box
• Specification: DN15-DN1200
• Trademark: SDFL
• Origin: China
• HS Code: 7307210000
• Production Capacity: 500000
• Package Size: 60.00cm * 60.00cm * 40.00cm
• Package Gross Weight: 1000.000kg
• Lead Time: 1 days (1 - 2 Pieces) ; To be negotiated ( > 2 Pieces)

Product Description

Product Description

SDFL is a professional manufacturer of pipe fittings,  and flanges, serving industries including water treatment, construction, petrochemical, and oilfield. Equipped with an ISO 9001 and CE-certified modern factory, we strictly adhere to international standards (GB, JIS, DIN, EN, ANSI/ASME) to ensure superior performance in material quality, pressure resistance, and reliability. With competitive pricing, fast delivery, and customization capabilities, we are committed to providing stable and high-quality industrial piping solutions, striving to be your trusted long-term partner.

SDFL also offer, , , , ,, , , , , , , , stainless steel pipes, etc.

Flange Type	Plate flange, Welding Neck Flange, Blind Flange, Threaded flange, Slip-on Flange, Socket Weld Flange, Sterilization pot flange, Flexible Joint Flange, Tube Sheet, large diameter flange, Press fitting flange, Pressure vessel flange, Lap Joint flange, Butterfly valve flange.
Size	DN15-DN4000, Max Outside Diameter: 6000mm
Pressure	150#-2500#,PN0.6-PN400,5K-40K
Sealing Face	Raised Face (RF), Full Face (FF), Ring Joint (RTJ)
Standard	GOST 12820-80 / ANSI B16.5 / EN1092 / BS4504 / JIS B2220-2012 / DIN / AMSE B16.5
Wall Thickness	SCH5S, SCH10S, SCH10, SCH40S,SCH20,SCH30,SCH40, SCH60, SCH80, SCH160
Material	Stainless steel: A182F304/304L, A182 F316/316L, A182F321, 1.4301, 1.4401 Duplex Stainless Steel:A182 Gr F51 B16.5,A815 Gr WPS31803 (UNS31803)
Application	Water Treatment, Food and Beverage (Dairy Processing), Papermaking Industry, Shipbuilding Industry, Power Industry, Bioengineering, Natural Gas, Wastewater Treatment, Construction, Metallurgical Industry, Semiconductor Industry, Photovoltaic (PV) Industry, New Energy, Petrochemical and Oilfield Industry.
Surface treatment	Mill Finish / Sandblasting / Marking
For products with specific requirements, please contact our service team.

1.Dimensional Accuracy: Key Tolerances Stricter than General Industry Requirements
All flanges conform strictly to GOST 12820-80 / ANSI B16.5 / EN1092 / BS4504 / JIS B2220-2012 / DIN / AMSE B16.5. The tolerance for the bolt circle diameter is controlled within ±0.5 mm (industry typical: ±1.0 mm). The flatness deviation of the sealing face does not exceed 0.2 mm, ensuring highly effective sealing with the piping system.
 
Data Support:
Standard: ASME B16.5 Steel pipe flanges – Part 1: Class 300 designated
Pass rate of 30 production batches: 100% (Third party test report No. XXXX)Available
 
2.Material Chemistry & Mechanical Properties: ≥20% Safety Margin above Standard Minimums
Flanges are made of forged A182  F304/F316L stainless steel per ASME B16.5 Class 300. Chemical composition is fully verified by optical emission spectrometry complying with ASTM requirements. Actual yield strength exceeds the minimum standard value by no less than 20%.
 
Data Support:
Tensile strength: 485–655 MPa (min standard: 485 MPa) 
Elongation: ≥30% (min standard: 22%) 
0℃ impact toughness: ≥60 J (min standard: 27 J)
 
3.Lower Life-Cycle Cost
The raised face hardness is uniformly 140–180 HB with a maximum variation ≤15 HB on a single flange. Hydrostatic test pressure for Class 300 (forged steel A182 F304/F316L at ambient temperature) is 7.65 MPa (1110 psi) – 1.5× the 740 psi rating. No visible leakage is observed, and helium leak test shows a rate ≤1e-6 Pa·m³/s
 
Data Support:
Test pressure: 1110 psi (7.65 MPa) for Class 300 (per ASME B16.5 para. 8.4.2)
Hold time: ≥5 minutes, pressure drop <0.05% of test pressure
Leak test method: ASME Section V, Article 10

4.Traceability & Process Capability (Cpk ≥ 1.33)
Each flange is laser marked with heat number, material grade, and Class 300 identification. Critical dimensions (OD, thickness, bolt hole position) are monitored by SPC. The Cpk value consistently ≥1.33 – e.g., thickness tolerance ±0.5 mm, actual standard deviation ≤0.09 mm results in Cpk = 1.33.
 
Data Support:
Past 1 months shipment: 18,500 pcs of Class 300 flanges
Customer site rejection rate: 0.07% (13 pieces rejected for minor transport damage, none for dimensional non conformance)
Sample process capability report: OD tolerance ±0.8 mm, measured σ = 0.12 mm → Cpk = 1.67
 
5.Corrosion Resistance & Service Life (ASME Class 300 Environment)
For A182 F316L flanges, pitting resistance per ASTM G48 (6% FeCl3, 24 h) shows corrosion rate <0.5 g/m²·h. Neutral salt spray (ASTM B117) passes 1000 hours without red rust. Using Arrhenius modeling, the expected service life in a typical chemical plant environment (ambient to 150°C, low chloride) is ≥20 years.
 
Data Support:
Real case: A182 F316L Class 300 flanges in a refinery cooling water loop (120°F, <20 ppm Cl) after 23 years – average thickness loss <0.25 mm
Accelerated test: 200 days at 60°C / 95% RH with no intergranular corrosion (ASTM A262 Practice E)

Certifications

Packing & Delivery

After Sales Service

Quality Assurance

24-hour online support

Professional Team Support

All products undergo rigorous inspection throughout production until pre-shipment. Additionally, we provide a 3-year quality warranty service. For any quality-related issues, please contact our service team, and we will provide solutions within 24 hours.

Our service team operates 24/7 to provide immediate responses to both after-sales product issues and new product inquiries. For special circumstances, we offer both online and on-site support services.

SDFL maintains a professional engineering team capable of providing both online and on-site services. With years of project experience, we offer expert advice for both standard and specialized projects.

Company Profile

Shangdian Flange Pipe Fittings Co.,Ltd. is a professional flanges and pipe fittings manufacturer and exporter for water treatment, construction, petrochemical and oilfield industry. We deliver exceptional value by providing customers with the most important elements : Premium Quality, Reasonable Price and Impeccable Services.

Shangdian Flange Pipeline designs and builds a broad array of quality products in its ISO 9001 and CE manufacturing facility. Our products adhere to GB, JIS, DIN,, EN, ANSI/ASME specifications for material content, pressure ratings and quality assurance, ensuring that our customers receive consistent quality and reliability every time. Additionally, we are able to modify existing products or manufacture new designs to meet specific requirements. 

1.Produced from wide range of equipment.
We have a wide range of equipment, including sandblasting machines, polishing machines, sawing machines, laser cutting machines, heat treatment centers, presses and CNC machine tools, with a total of more than 180 pieces of equipment.

2.Stress testing and performance testing.
Our products undergo multiple rounds of quality inspections—from raw material processing to production, and even after completion. Additionally, we have a dedicated product laboratory in the 3F workshop for enhanced quality control.

3.Design exploring
High Technology in design exploring and production workmanship

4.Customization
Shangdian is a factory with a professional engineering team. We can customize products based on your provided drawings and also offer suggestions for your reference.

5.Extensive inventory
For conventional , pipe fittings and flanges, we keep substantial inventory to ensure the shortest possible delivery time.

FAQ

1. Are you a trading company or factory? 
We are a manufacturer boasting 15 years of industry experience and holding proprietary import-export rights.
 
2.May I request free samples?
Free samples can be provided for first cooperation under sincere cooperation. 
 
3.What certifications do you have?
Yes, we hold ISO, CE, and PED certificates. In addition, we possess a number of design patents and a Special Equipment Manufacturing License.
 
4.How do you control the quality? 
In quality control, the most critical aspect is preventing material mix-ups.
Our factory has installed multiple spectroscopic PMI analyzers in the raw material warehouse, production workshop, and dispatch area.
Equipment such as pressure testing machines, PMI analyzers, RA roughness testers, and hardness testers all contribute to ensuring quality. Additionally, we have our own laboratory and can provide extra test data for special products.
During the production process, dedicated inspectors conduct checks at different stages.
Furthermore, a specialized team of quality inspectors examines finished products to effectively prevent issues like quantity shortages, quality defects, and chemical mix-ups.
 
5.If there is any quality problem, how do you solve it? 
We believe that protecting our clients' interests is the cornerstone of our business. While we cannot guarantee 100% perfection, occasional quality issues may still arise.
Depending on the specific situation, we typically resolve such cases through replacements, compensation, or resending goods. The specific solution will be discussed and agreed upon with the customer based on the actual circumstances.
 
6. How long is your delivery time? 
For normal products in 7-10 days; For bulk order, in 15-25 days. It depends. 
 
7. Warranty time? 
3 years warranty for all of our stainless steel products. Gaskets or the easy broken parts are not included due to the different application for customers. 
 
8.Can you provide us with the testing report?
Yes, we can provide the required material reports, such as the material certificate, mill certificate, pressure testing report, roughness report, measurement report, and hardness report.