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NXF UNS N04400/Monel400/NiCu30Fe/Alloy 400/NCu30 DN15-1200 Class150-2500 Forged Nickel Alloy Blind BL Flanges
2026-01-04 18:23 NXF-GROUP
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Monel400 Introduction
Monel 400 alloy (UNS N04400/MCu-28-1.5-1.8/Ni68Cu28Fe) is a nickel-based alloy, primarily composed of nickel-copper alloy, with a melting point of 1300-1350°C. It exhibits good corrosion resistance in corrosive media such as seawater, hydrofluoric acid, and sulfuric acid. This alloy demonstrates stable mechanical properties and is suitable for working environments ranging from low to high temperatures. Welding can be performed using TIG, MIG, and manual arc welding, matched with Monel body material or EniCu-7 welding consumables. This alloy is mainly used in the manufacture of heat exchange equipment, chemical pipelines, reaction vessels, and other devices, conforming to standards including ASTM B 164 (bars) and ASTM B 127 (plates). During machining,shrinkage allowance must be allowed to ensure dimensional accuracy. This can be achieved through traditional machining methods; however, high-speed machining requires the use of water coolant.Blind Flanges Introduction
It is used to terminate the end of a piping system. The blind flange is basically a flange that does not have a hub or a bored center. Blind flanges have the face thickness of a flange, a matching face type, and similar bolting pattern. Blind flanges can also be used to seal a nozzle opening on a pressure vessel. Because it is bolted, the blind flange provides easy access to the interior of a vessel or pipe, unlike a cap that is welded.BLIND FLANGE DRAWING
Monel400 Chemical Composition And Mechanical Properties
Blind Flanges Actual Product Image
Specification
Blind Flanges Produce Processing
1. Raw Material Selection & Inspection
- Select qualified carbon steel (A105), stainless steel (304/316) forgings or steel plates meeting pipeline industry standards.
- Conduct chemical composition analysis and mechanical property testing; reject materials with internal cracks, inclusions or unqualified hardness.
2. Blanking & Cutting
- Cut forgings/steel plates into fixed-size blanks by sawing machine or CNC flame cutting according to blind flange specification.
- Control blank weight and thickness tolerance to ensure subsequent processing allowance.
3. Forging & Shaping (for forged type)
- Heat blanks to optimal forging temperature; form via hydraulic press forging to ensure dense internal structure.
- Trim forging flash and ensure flange basic shape meets drawing outline; air-cool or heat-treat as required.
4. Precision Machining
- Rough Machining: Turn outer circle, sealing face and bolt hole positions on lathe/milling machine to remove excess allowance.
- Finish Machining: Precision machine sealing face (flatness/roughness up to standard); drill and tap bolt holes evenly by CNC drilling machine.
- Process sealing groove (if needed) matching gasket type to ensure sealing performance.
5. Heat Treatment (if required)
- Perform normalizing, quenching and tempering on carbon steel blind flanges to improve toughness and strength.
- Conduct solution treatment on stainless steel types to enhance corrosion resistance; eliminate machining internal stress.
6. Surface Treatment
- Anti-rust treatment: Carbon steel flanges adopt galvanizing, painting or anti-rust oil coating; stainless steel flanges use passivation.
- Clean sealing face thoroughly to remove oil stains and machining residues, avoiding sealing failure.
7. Final Inspection & Testing
- Dimensional inspection: Check outer diameter, thickness, bolt hole spacing via caliper, micrometer and coordinate measuring machine.
- Sealing test: Conduct pressure
test on sealing face to ensure no leakage; inspect surface for scratches, pits or deformation.
test on sealing face to ensure no leakage; inspect surface for scratches, pits or deformation.
- Marking inspection: Verify material grade, specification, standard number (ASTM/GB) marked on flange surface.
8. Packaging & Storage
- Wrap qualified blind flanges with anti-rust paper; pack in wooden cases by specification to prevent collision damage.
- Label batch number, inspection date and material info; store in dry, ventilated warehouse to avoid rust and moisture.
Packing & Delivery
Shipping
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 in 1980, 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 as follow: 1.We 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. 2. We can strictly control the quality. We have production, quality inspection, warehousing and other departments to coordinate and control the quality. 3. Our biggest advantage is 3S service. Small quantity, short time, special materials.
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:3S Service (Small Quantity/Short Time/Special Material) We have our own factories, quality can be controlled seriously.We Specialize in manufacturing about 21 years.We have professional testing department and testing equipment.
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
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