NXF GROUP
Phone/Whatsapp:+8613917160311
Email: info@nxf-group.com
Email: Andrew@nxf-group.com
Email: Alice@nxf-group.com
English
NXF UNS NO7718/2.4668/NiCr19NbMo/alloy 718 DN15-1500 Class150-2500 Nickel Alloy Forged Fitting Long Weld Neck Flanges
2026-09-23 17:03 NXF GROUP
1
Products Description
Alloy 718 Introduction.
Alloy 718/2.4668 is a nickel-chromium-iron alloy with niobium and molybdenum and low contained aluminum and tnum. Excellent mechanical properties in lower temperatures. Excellent corrosion resistance at high and low temperatures
Inconel 718 is a nickel-based super alloy that is well suited for applications requiring high strength in temperature ranges from cryogenic up to 1400°F. Inconel 718 also exhibits excellent tensile and impact strength.
Inconel 718 is a nickel-based super alloy that is well suited for applications requiring high strength in temperature ranges from cryogenic up to 1400°F. Inconel 718 also exhibits excellent tensile and impact strength.
Long Weld Neck Flanges Introduction
1. Basic Definition and Structure：
Long Weld Neck Flanges are high-grade forged pipe fittings featuring an extended, tapered long neck and a flat flange face. Different from standard short weld neck flanges, they have a longer transition section between the
pipe weld end and the flange body. The integral forging structure ensures one-piece forming without splicing, providing excellent structural integrity.
pipe weld end and the flange body. The integral forging structure ensures one-piece forming without splicing, providing excellent structural integrity.
2. Working Principle：
These flanges are butt-welded to pipeline ends through their long tapered neck. The prolonged transition gradually distributes pipeline stress, vibration and pressure load to the flange body. The smooth structural transition avoids
stress concentration at the welding joint and forms a stable, leak-proof pipe connection system.
stress concentration at the welding joint and forms a stable, leak-proof pipe connection system.
3. Core Performance Advantages：
Due to integral forging and long neck design, long weld neck flanges own higher strength, better toughness and superior fatigue resistance. They effectively resist deformation, cracking and loosening under high pressure, high temperature and continuous vibration conditions. The smooth inner surface also reduces fluid resistance and improves pipeline flow performance.
4. Application Scope：
They are widely used in critical industrial piping systems including petroleum refining, natural gas
transmission, chemical processing, thermal power plants and high-pressure boiler pipelines. They are specially applied for
high-temperature, high-pressure and heavy-load working conditions that require ultra-high connection safety and stability.
transmission, chemical processing, thermal power plants and high-pressure boiler pipelines. They are specially applied for
high-temperature, high-pressure and heavy-load working conditions that require ultra-high connection safety and stability.
5. Structural and Usage Characteristics：
Long weld neck flanges have stricter manufacturing standards and higher cost than
ordinary flanges. Their long neck requires precise butt welding operation, which increases construction difficulty. However, they provide long-term reliable sealing and structural stability, making them the preferred choice for permanent and high-risk industrial pipeline connections.
ordinary flanges. Their long neck requires precise butt welding operation, which increases construction difficulty. However, they provide long-term reliable sealing and structural stability, making them the preferred choice for permanent and high-risk industrial pipeline connections.
Long Weld Neck Flanges Drawing
Alloy 718 Chemical composition and mechanical properties
Factory and Product Pictures
Long Weld Neck Flanges Factory and Product Pictures
Alloy 718 PMI spectral testing proves
Customer visit to the factory video
Alloy 718 Long Weld Neck Flanges Produce Processing
High-quality alloy steel and carbon steel round bars are selected as raw materials. Factory inspectors check the chemical composition, mechanical properties and surface condition of the steel. After passing strict incoming inspection, the raw materials are accurately cut into standard blanks with proper machining allowance for subsequent forging.
2. High Temperature Forging Forming：
The qualified blanks are heated to the specified forging temperature and forged by
professional forging machines. Integral forging technology is used to form the complete flange disc, tapered transition section and long weld neck. This process optimizes internal metal structure, improves material density and enhances overall structural strengt
.
3. Professional Heat Treatment：
Forged workpieces are treated with normalizing and tempering processes. This step eliminates internal residual stress generated during forging, improves material toughness and tensile strength, and stabilizes the overall shape. It effectively prevents deformation and cracking in high-pressure and high-temperature working environments.
4. High-Precision CNC Machining：
CNC lathes and milling machines are adopted for finish machining. The long weld neck, welding bevel, sealing surface, inner hole and bolt holes are precisely processed according to standard dimensions. Strict tolerance control ensures flatness, verticality and accurate assembly performance.
5. Deburring and Surface Treatment：
All machining burrs, sharp edges and metal residues are thoroughly removed. The sealing surface is finely polished to guarantee tight sealing. Meanwhile, anti-rust oil or anti-corrosion coating is applied to improve surface protection and service life.
6. Final Inspection and Packaging：
Finished flanges undergo comprehensive quality inspection, including dimensional tolerance, flatness, hardness and surface defect detection. Qualified products are marked with material grade, specifications and batch number, then professionally packaged for delivery and storage.
Our NXF GROUP advantage as follow
1.Our NXF GROUP have our own factory, and we can control the cost by producing by ourselves. We have a great advantage in price and can give you the lowest price based on best quality.
2.Our NXF GROUP can strictly control the quality. We have production,quality inspection, warehousing and other departments to coordinate and control the quality,Such as PMI and size testing.
3.Our NXF GROUP biggest advantage is 3S service. Small quantity, short time, special materials.
4.Our NXF GROUP have excellent qualitycertificate system and trademark certificate
5.Our NXF GROUP have a comprehensive after-sales service guarantee, such as the transaction guarantee provided by Alibaba International Station, as well as remote technical guidance and services.
6.Our NXF GROUP have a well-established logistics support system that can save you both time and money, providing you with a one-stop service.
3.Our NXF GROUP biggest advantage is 3S service. Small quantity, short time, special materials.
4.Our NXF GROUP have excellent qualitycertificate system and trademark certificate
5.Our NXF GROUP have a comprehensive after-sales service guarantee, such as the transaction guarantee provided by Alibaba International Station, as well as remote technical guidance and services.
6.Our NXF GROUP have a well-established logistics support system that can save you both time and money, providing you with a one-stop service.
Packing & Delivery
Packing
Delivery
Company Profile
New XiFei (SuZhou) Business Co.,Ltd is one of the leading and most respected manufacturers in China. Our products includemetals,machinery, containers, construction materials, mechanical products, electrical systems, and medical
accessories.Establishedin1980, XIFEI has been working diligently ever since to embrace the needs of our global customer base.We work to ensure absolutecustomer satisfaction. Our team has dedicated itself to perfecting our three core components, "Service, Management andCraftsmanship." Our advantage:3S Service(Small Quantity/Short Time/Special Material).
accessories.Establishedin1980, XIFEI has been working diligently ever since to embrace the needs of our global customer base.We work to ensure absolutecustomer satisfaction. Our team has dedicated itself to perfecting our three core components, "Service, Management andCraftsmanship." Our advantage:3S Service(Small Quantity/Short Time/Special Material).
Certification
FAQ
1. who are we?
We are based in Jiangsu, China, start from 2021,sell to South Asia(30.00%),South America(10.00%),Eastern Europe(10.00%),Mid East(10.00%),Eastern Asia(10.00%),Southeast Asia(5.00%),Africa(5.00%),Central America(5.00%),Northern Europe(5.00%),North America(5.00%),Domestic Market(5.00%). There are total about 101-200 people in our office.
2. how can we guarantee quality?
Always a pre-production sample before mass production;
Always final Inspection before shipment;
3.what can you buy from us?
Pipe,Flange,Steel plate,Pipe fittings,Alloy products
4. why should you buy from us not from other suppliers?
We are based in Jiangsu, China, start from 2021,sell to South Asia(30.00%),South America(10.00%),Eastern Europe(10.00%),Mid East(10.00%),Eastern Asia(10.00%),Southeast Asia(5.00%),Africa(5.00%),Central America(5.00%),Northern Europe(5.00%),North America(5.00%),Domestic Market(5.00%). There are total about 101-200 people in our office.
2. how can we guarantee quality?
Always a pre-production sample before mass production;
Always final Inspection before shipment;
3.what can you buy from us?
Pipe,Flange,Steel plate,Pipe fittings,Alloy products
4. why should you buy from us not from other suppliers?
1.Our NXF GROUP have our own factory, and we can control the cost by producing by ourselves. We have a great advantage in price and can give you the lowest price based on best quality.
2.Our NXF GROUP can strictly control the quality. We have production,quality inspection, warehousing and other departments to coordinate and control the quality,Such as PMI and size testing.
3.Our NXF GROUP biggest advantage is 3S service. Small quantity, short time, special materials.
4.Our NXF GROUP have excellent qualitycertificate system and trademark certificate
5.Our NXF GROUP have a comprehensive after-sales service guarantee, such as the transaction guarantee provided by AlibabaInternational Station, as well as remote technical guidance and services.
6.Our NXF GROUP have a well-established logistics support system that can save you both time and money, providing you with aone-stop service.
5. what services can we provide?
Accepted Delivery Terms: FOB,CFR,CIF,EXW,FCA,DDP,DDU；
Accepted Payment Currency:USD,EUR,CAD,HKD,CNY;
Accepted Payment Type: T/T,L/C,D/P D/A,Credit Card,PayPal;
Language Spoken:English,Chinese,Spanish,Russian
2.Our NXF GROUP can strictly control the quality. We have production,quality inspection, warehousing and other departments to coordinate and control the quality,Such as PMI and size testing.
3.Our NXF GROUP biggest advantage is 3S service. Small quantity, short time, special materials.
4.Our NXF GROUP have excellent qualitycertificate system and trademark certificate
5.Our NXF GROUP have a comprehensive after-sales service guarantee, such as the transaction guarantee provided by AlibabaInternational Station, as well as remote technical guidance and services.
6.Our NXF GROUP have a well-established logistics support system that can save you both time and money, providing you with aone-stop service.
5. what services can we provide?
Accepted Delivery Terms: FOB,CFR,CIF,EXW,FCA,DDP,DDU；
Accepted Payment Currency:USD,EUR,CAD,HKD,CNY;
Accepted Payment Type: T/T,L/C,D/P D/A,Credit Card,PayPal;
Language Spoken:English,Chinese,Spanish,Russian
声明：此篇为NXF GROUP原创文章，转载请标明出处链接： https://www.nxf-group.com/h-nd-2377.html
Phone
+8613917160311
Whatsapp
Whatsapp
+8613917160311
Wechat
Wechat
Inquiry
Email
info@nxf-group.com
Inquiry
Inquiry