Forged Stainless Steel Swage Nipple are manufactured with qualified row material and latest technology in accordance with ASME B16.11, thus their durability and high quality have guaranteed. It has the same function with butt weld reducer that connect pipes and reduce the pipe diameter.

Stainless Steel Swage Nipple Manufacturer

• Row Material

They are made from seamless pipes or bar material with suitable working pressure equivalent to straight seamless pipes.

• Dimensions

The dimensions of swage nipple are in line with ASME B16.11 or MSS SP-95 which cover diameter, pressure, finish, tolerances, marking and testing.

• Type

There are two shapes that concentric and eccentric. Concentric type is more suitable for vertical pipes, and eccentric type can work better in horizontal pipes.

• End

Both ends of forged nipples can be beveled, plain or threaded. It depends on your demand.

• Material

The stainless steel swage nipple is complied to ASTM A182 which covers forged fittings and flanges. The chemical composition and mechanical property of products should be within the scope of the standard.

ANSI B16.11 Forged Nipple

ASTM A182 Threaded Forged Swage Nipple

Stainless Steel Nipples are wildly used in various industries because of their excellent corrosion resistant and great mechanical properties. The most common used grades in industries are ASTM A182 F316 and F304.

Stainless Steel contains chromium and nickel to ensure the excellent corrosion resistance. Chromium is a key component that used in the manufacture of stainless steel. The oxidation resistance potential of chrome is irreplaceable. Due to the content of chromium and nickel, it works well under conditions of high temperature and resistant to hot corrosion.

The excellent mechanical properties especially the great tensile strength makes stainless steel nipples satisfy the requirements of various industries.

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SS 304 Butt Weld Cap is a stainless steel pipe fittings which butt weld onto the exterior of a pipe to block off the end of pipeline system. The original material is stainless steel 304 plate. It could be seamless and welded depending on the diameter. Usually the larger diameter cap is weld. The normal size is seamless.

Pipe cap use steel plate as the starting material and are forged to get the shape, and it is more common in stainless steel. The end will be beveled for welding easily. It offers more robust connection and strength of the piping system. It’s usage and application is very extensive since butt weld end cap’s size range is wide from 1/2” to 48” with schedules.

Stainless Steel Butt Weld Cap Price

Butt Weld Cap Application

Stainless Steel 304 Butt Weld Cap

While 304 butt weld cap is widely used in the fields of chemical, oil mills, petrochemical, mining, fertilizers, shipbuilding, power plant, steel plant, oil & gas,  paper, ports, cement and engineering.

Advantages of Buttweld End Cap

• Offer permanent leak proof
• Reduce pressure losses
• Adds strength and power to the piping structure
• Deliver a framework that uses atleast space

A403 WP304/304L Cap Chemical & Tensile

Type 304/304L stainless steel is a T 300 Series Stainless Steel austenitic. It has a minimum of 18% chromium and 8% nickel, combined with a maximum of 0.08% carbon. It is a Chromium-Nickel austenitic alloy.

As American AISI basic grades, the practical difference between 304 and 304L is carbon content only. They have carbon ranges of 0.07% maximum and 0.030% maximum respectively. The lower carbon content in 304L minimizes deleterious carbide precipitation as a result of welding.

However, 304L is common practice to be dual certified as 304 and 304L.

Carbon is a negative element in stainless steel, so the less carbon there is, the better the quality of stainless steel, and the more expensive the price.

So Stainless Steel 304 butt weld cap is an economical and versatile corrosion resistant cap suitable for a wide range of general purpose applications. It can offer permanent leak proof, add strength and power to the piping structure, reduce pressure losses.

304/304L Cap Chemical Composition

304/304L Cap Tensile Test

SS 316 Pipe Cap BW End

SS 316 is higher grade than SS 304 butt weld cap. The molybdenum makes 316 better overall corrosion resistant properties than 304, particularly higher resistance to pitting and crevice corrosion in chloride environments. SS 316 Cap can be used in more areas and be the first choice according to the high demand.

3″ Sch10s SS 316 Butt Weld Cap

ASME B16.9 Fittings Standard

ASTM A403 is stainless steel butt weld fittings material standard and ASME B16.9 is manufacture standard. But for low pressure corrosion resistant butt welding fittings, it is MSS SP-43 standard.  ASTM A403 Standard specification covers the standard for wrought authenticate Stainless Steel pipe fittings for pressure piping applications.

Stainless Steel Fittings Document/Certificate 

Zizi Engineering is 304 butt weld cap manufacturer and supplier and carries an extensive inventory. Clients are satisfied with our products quality assurance and good price. The mostly important is the documents and certificates for stainless steel pipe cap.

• Commercial Invoice consisting HS code
• Packing List with package details
• Material Examination
• Certificate of Origin
• Raw Material Test Reports
• Mill Test Certificates
• Solution Heat Treatment
• NDT Report

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Manufacturer of stainless steel pipe fittings not only consider cost of pipe fittings, but consider corrosion prevention and product quality. Therefore, stainless steel pipe will take the solid solution in the manufacturing, because it enhance the safety of pipe fittings. The Stainless Steel Treatment is very important for the quality and safety of the pipe. There are small number of manufacturers in order to save costs. It will bring permanent troubles in future that changes solid solution to polished sand blasting for the purpose of covering defects.

The solution treatment is the stainless steel heated to 950~1150℃, then preservation the temperature for a certain time. This process makes carbide and various alloying elements evenly dissolved,  Austenitic stainless steel are soften.

A403 WP304 Conc Reducer

Stainless Steel Heat Treatment Effect 

After forming and welding of the stainless steel pipe, the structure, magnetism and physical properties of the metal have changed. The solution process can restore the corrosion resistance after processing, and obtain the hardness of stainless steel to ensure the best performance. After the solution treatment of stainless steel pipe fittings, has a good role in improving:

1. Make pipe fittings more convenient and safe in the installation. It eliminates modification phenomenon of Stainless Steel Pipe Fittings, so that the hardness reduced to 220HV below, and improves plasticity and toughness as well.

2. Restoring the stress and intergranular change of stainless steel pipe fittings in the process, reduce stainless steel intergranular corrosion and stress corrosion, enhance corrosion resistance.

3. Removing magnetic, stable austenite organization of stainless steel due to processing.

4. Restoring the surface natural brightness of the stainless steel material (natural bright and polished light is different).

Characteristics of Stainless Steel Pipe Fittings Solid Solution

Stainless steel is a special steel, since nickel, chromium and other alloying elements exist. So it has different characteristics with ordinary steel heat treatment.

1. The thermal conductivity of stainless steel is low, so heating process at low temperature should be slow. At room temperature, stainless steel  only has 27% of carbon, and with the increases of heating temperature, the thermal conductivity characteristics and difference decreases gradually.

2. Austenitic stainless steel is get to 1100 ℃ by solution heating, can inhibit the production of carbide, and then quickly cooled to room temperature, so that carbon reached over saturation, can greatly improve corrosion resistance of stainless steel.

3. Pipe fittings are using (hydrogen) gas protection in the solution process, to avoid stainless steel surface viscous iron oxide production, Restoring stainless steel surface,and improving the appearance of the reputation.

Three Elements for Solid Solution Stainless Steel Pipe Fittings

The advantages and disadvantages of solution process have a great influence on the corrosion resistance and the appearance brightness of stainless steel, and it plays a decisive role in the processing performance. Therefore, the heat treatment has play a important position s in the production of stainless steel pipe fittings

1.Solution temperature. According to the characteristics of stainless steel chemical composition, solution temperature of 950-1150 degrees to achieve softening effect, so that the hardness of stainless steel reduced to 220HV, to meet the quality requirements of pipe installation. If the temperature control is unreasonable, it is easy to appear various quality defects.

2. Solution time. The residual ferrite content of austenitic stainless steels decreases with heating time increasing in the heating process. Therefore, the solution treatment should at 1050 ℃. So that the carbon reaches saturation, improve corrosion resistance. And then quickly cooled in the air to achieve the solution effect.

3. The heating process of stainless steel at low temperature should be slow. If the heating speed is too fast to produce deformation,so should be controlled heating speed, and pay attention to heat preservation time. such as 316L in 1100 ℃, residual ferrite content will continue to be reduced if holding time long.

The solution of stainless steel pipe fittings should be heated–insulation–time cooling process, it will take about 40 minutes.

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