NXF GROUP
Phone/Whatsapp:+8613917160311
Email: info@nxf-group.com
Email: Andrew@nxf-group.com
Email: Alice@nxf-group.com
English
NXF USN A36/DIN17100/10025-2/G3101 DN15-1200 Class 150-2500 Carbon Steel A36 Black Oxide Forging Flange Weld Neck Flanges
2026-11-03 16:20 NXF GROUP
1
Products Description
A36 Introduction
ASTM A36 is the most commonly used mild and hot-rolled steel. It has excellent welding properties and is suitable for grinding, punching, tapping, drilling and machining processes. Yield strength of ASTM A36 is less than that of cold roll C1018, thus enabling ASTM A36 to bend more readily than C1018. Normally, larger diameters in ASTM A36 are not produced since C1018 hot roll rounds are used.
A36 Black Oxide Weld Neck Flanges Introduction
A36 Black Oxide Weld Neck Flange is a forged carbon steel flange manufactured from A36 carbon steel, finished with black oxide surface treatment. It features a tapered hub and smooth transition to the pipe, which reduces stress concentration at the welding joint and improves the structural strength of the connection. The black oxide coating provides mild rust resistance, improves surface lubricity and preserves the original dimensional accuracy without thick coating build-up. This flange has evenly distributed bolt holes for stable clamping and reliable sealing with gaskets. It is suitable for high-pressure, high-temperature piping systems that require strong welding joints, widely used in oil & gas, water supply, pipeline transmission and general industrial piping projects. We supply various pressure classes and sizes according to ANSI/ASME standards.
A36 Black Oxide Weld Neck Flanges Drawing
A36 Chemical Composition And Mechanical Properties
Factory and Product Pictures
A36 Black Oxide Weld Neck Flanges Product Pictures
A36 PMI spectral testing proves
Video of a customer visiting us
Product processing
A36 Black Oxide Weld Neck Flanges Product Processing
1.Raw Material Inspection:
We receive A36 carbon steel billets, and conduct incoming material verification. Check the material heat number, chemical composition and mechanical properties by spectrometer and tensile test. Inspect the billet surface for cracks, folds, inclusions and other defects. Confirm compliance with ASTM A36 standard. Non-conforming raw materials are segregated and rejected.
2.Hot Forging Forming:
4.CNC Machining:
5.Black Oxide Surface Treatment & Inspection:
6.Cleaning, Packaging & Shipment:
2.Hot Forging Forming:
Heat the qualified steel billet to the specified forging temperature range in the heating furnace. Transfer the heated blank to the forging press, forge step by step to form the weld neck flange rough shape, including the hub, tapered neck and flange plate. Control forging pressure and forming speed to avoid internal laminations or unfilled corners. After forging, cool the workpiece under controlled conditions.
3.Normalization Heat Treatment:
Load forged blanks into the heat treatment furnace for normalization. Uniform the internal grain structure, eliminate forging stress, improve material toughness and machinability. Record furnace temperature, holding time and cooling curve for traceability.
4.CNC Machining:
Perform rough turning and finish turning on CNC lathes to machine the sealing face, hub outer diameter, inner bore and taper neck. Use the drilling machine to process bolt holes according to the drawing tolerance requirements. Strictly control dimensions, flange thickness, bolt circle diameter and surface flatness. Remove sharp burrs after machining.
5.Black Oxide Surface Treatment & Inspection:
Carry out black oxide (blackening) treatment on the machined flange. Clean oil and debris first, then complete alkaline oxidation to form a uniform black protective film on the steel surface for mild rust resistance. Conduct full inspection: dimension retest, visual check for surface defects, sealing surface flatness inspection and hardness spot check. Mark heat number, material grade, size and pressure class on qualified flanges.
6.Cleaning, Packaging & Shipment:
Clean the flange thoroughly to remove residual treatment liquid and dust. Protect the sealing surface with plastic protective cover. Wrap with anti-rust paper and place into wooden cases with cushioning materials to prevent scratching and collision. Attach material test report and shipping label before delivery.
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 quality certificate 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.
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 quality certificate 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 include metals,machinery, containers, construction materials, mechanical products, electrical systems, and medical accessories.Established in1980, XIFEI has been working diligently ever since to embrace the needs of our global customer base.We work to ensure absolute customer satisfaction. Our team has dedicated itself to perfecting our three core components, "Service, Management and Craftsmanship." 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%),Eastern Asia(10.00%),Mid East(10.00%),Eastern Europe(10.00%),South America(10.00%),Domestic Market(5.00%),North America(5.00%),Northern Europe(5.00%),Central America(5.00%),Africa(5.00%),Southeast Asia(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?
Our advantage:
We are based in Jiangsu, China, start from 2021,sell to South Asia(30.00%),Eastern Asia(10.00%),Mid East(10.00%),Eastern Europe(10.00%),South America(10.00%),Domestic Market(5.00%),North America(5.00%),Northern Europe(5.00%),Central America(5.00%),Africa(5.00%),Southeast Asia(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?
Our advantage:
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 quality certificate 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.
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 quality certificate 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.
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-2484.html
Phone
+8613917160311
Whatsapp
Whatsapp
+8613917160311
Wechat
Wechat
Inquiry
Email
info@nxf-group.com
Inquiry
Inquiry