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NXF UNS N06625 Alloy 625/2.4856/N06625 OD DN15-1200 Thickness SCH10-XXS Nickel Alloy Butt Welding Cap
2026-07-17 18:30 NXF GROUP
6
Alloy 625 introduction
Super alloys are also referred to as high performance alloys. They can function at high temperatures and mechanical stress, and are formed in different shapes. They are strengthened by work hardening, solid-solution hardening, and precipitation hardening.There are three groups of alloys, namely cobalt-based, nickel-based, and iron-based super alloys.Altemp 625™ is a nickel-chromium-molybdenum wrought alloy. It has an ability to withstand stress-corrosion cracking and intergranular attack. The following sections with discuss about Altemp 625™ in detail.
Butt Welding Cap Introduction
Cap is a component of a pressure vessel that is welded to the cylindrical shell (see figure below). Based on their geometric shapes, they can be classified into various types, such as hemispherical, ellipsoidal, dished, spherical cap, conical, and flat; among these, hemispherical, ellipsoidal, dished, and spherical cap heads are collectively referred to as "dished heads" (or convex heads). In terms of welding methods, they are categorized into butt-weld heads and socket-weld heads. They are used in a wide range of vessel equipment, including storage tanks, heat exchangers, towers, reactors, boilers, and separation equipment. Materials include carbon steel (e.g., A3, 20#, Q235, Q345B, 16Mn), stainless steel (e.g., 304, 321, 304L, 316, 316L), alloy steel (e.g., 15Mo3, 15CrMoV, 35CrMoV, 45CrMo), aluminum, titanium, copper, nickel, and nickel alloys.
BUTT WELDING CAP DRAWING
Alloy 625 Chemical composition and mechanical properties
Factory and Product Pictures
PMI spectrum test certificate
Customer visit to the factory video
BW Cap Product Processing
1.Pressing: Following press-forming, the pipe cap requires immediate solution treatment at a temperature of 1150°C ± 20°C, with a holding time of approximately 1.5 hours.
2.Welding: Socket-weld pipe caps are welded using either resistance welding or arc welding techniques. Resistance welding is suitable for small-batch production and offers high efficiency, while arc welding is suited for mass production and entails lower costs. During the welding process, parameters such as current, voltage, and duration must be strictly controlled to ensure the strength and sealing integrity of the weld. For instance, in resistance welding, the current is typically maintained at approximately 3,000 amperes, the voltage between 20 and 25 volts, and the welding time between 2 and 3 seconds. Following welding, the weld seam must undergo non-destructive testing—such as ultrasonic or X-ray inspection—to ensure it is free of defects.
3.Cooling: After welding, the pipe cap must undergo water cooling or air cooling. Water cooling rapidly lowers the temperature to prevent weld deformation, while air cooling is suitable for mass production. The cooling rate must be controlled during the process to avoid weld cracking caused by excessive temperature differences.
4.Heat Treatment: Prior to heat treatment, the empty furnace is heated to above 1000°C. The workpiece is then loaded into the furnace, and the internal temperature is monitored using a thermocouple. The workpiece is heated to 1150°C ± 20°C and held at this temperature for 1.5 hours, after which it is removed and quenched in water, cooling to below 300°C within 3 to 4 minutes.
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
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 toensure absolute customer satisfaction. Our team has dedicated itself to perfecting our three core components, "Service, Managementand 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: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；
Accepted Payment Currency:USD,EUR,CAD,HKD,CNY;
Accepted Payment Type: T/T,L/C,D/P D/A;
Language Spoken:English,Chinese
6. Are you trading company or manufacturer ?
We are manufacturer.
7. How long is your delivery time?
Generally it is 5-10 days if the goods are in stock. or it is 15-20 days if the goods are not in stock, it is according to
quantity.
8. Do you provide samples ? is it free or extra ?
Yes, we could offer the sample for free charge but need pay the cost of freight.
9. What is your terms of payment ?
Payment<=1000USD, 100% in advance. Payment>=1000USD, 50% T/T in advance ,balance before shippment.
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；
Accepted Payment Currency:USD,EUR,CAD,HKD,CNY;
Accepted Payment Type: T/T,L/C,D/P D/A;
Language Spoken:English,Chinese
6. Are you trading company or manufacturer ?
We are manufacturer.
7. How long is your delivery time?
Generally it is 5-10 days if the goods are in stock. or it is 15-20 days if the goods are not in stock, it is according to
quantity.
8. Do you provide samples ? is it free or extra ?
Yes, we could offer the sample for free charge but need pay the cost of freight.
9. What is your terms of payment ?
Payment<=1000USD, 100% in advance. Payment>=1000USD, 50% T/T in advance ,balance before shippment.
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