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Duplex stainless steel electrofusion welded (EFW) pipes are governed by ASTM A928, a specification that covers various grades, including UNS S31803, UNS S32205, UNS S32750, UNS S32760, and others. Among these grades, UNS S31803 is widely used and is commonly referred to as 2205 stainless steel. The key characteristic of ASTM A928 UNS S31803 duplex stainless steel pipes is their unique microstructure, which comprises a combination of ferrite and austenite. This microstructure enables these pipes to exhibit exceptional corrosion resistance and significant strength.

Duplex stainless steel pipes made from ASTM A928 UNS S31803 have various applications. They find extensive usage in industries due to their excellent properties. These pipes are highly resistant to corrosion and provide superior strength compared to other types of stainless steel pipes. Their exceptional toughness and durability make them suitable for challenging environments, such as chemical plants, offshore oil and gas platforms, and desalination plants. Additionally, these pipes are widely used in the construction of heat exchangers, boilers, and pressure vessels.
The ASTM A928 UNS S31803 duplex stainless steel pipes are also preferred in the marine and shipbuilding industry due to their resistance to chloride-induced stress corrosion cracking. Moreover, they are employed in the food processing and pharmaceutical industries, where sanitary conditions are crucial, as they possess good cleanliness and can be easily cleaned and sterilized.
Furthermore, these pipes are utilized in the oil and gas sector for conveying corrosive fluids and natural gas, thanks to their high resistance to sulfur-containing environments. They also find application in the petrochemical industry for transporting chemicals and in the pulp and paper industry for handling corrosive chemicals and liquids.
In summary, the ASTM A928 UNS S31803 duplex stainless steel pipes have numerous applications in various industries, including chemical, offshore, desalination, marine, shipbuilding, food processing, pharmaceutical, oil and gas, petrochemical, and pulp and paper. Their exceptional properties make them a reliable choice for demanding environments and corrosive media.

Chemical processing
Transport and storage
Oil and gas exploration and processing equipment
Marine and other high-chlorine environments
Pulp and paper digesters
Wine tanks and paper machines

The specifications for ASTM A928 Duplex Stainless Steel Pipes are as follows. Please find below the content arranged in a highly similar manner to the original information:
ASTM A928 Duplex Stainless Steel Pipes are known for their exceptional properties and are widely used in various industries. These pipes are manufactured according to the standards set by the American Society for Testing and Materials (ASTM).
The ASTM A928 specification ensures that the duplex stainless steel pipes meet the necessary requirements for quality and performance. These pipes exhibit a combination of both austenitic and ferritic stainless steel properties, offering superior strength, corrosion resistance, and toughness.
One of the key features of ASTM A928 Duplex Stainless Steel Pipes is their ability to withstand extreme environments. They are highly resistant to pitting, crevice corrosion, stress corrosion cracking, and general corrosion caused by chemicals, acids, and salts.
The dimensions and sizes of these pipes are carefully specified in the ASTM A928 standard. They are available in a range of diameters, wall thicknesses, and lengths to accommodate various applications. The pipes can be customized according to specific project requirements.
Furthermore, the mechanical properties of these pipes are well-defined in the ASTM A928 standard. They possess excellent tensile strength, yield strength, and elongation properties. This ensures the durability and reliability of the pipes, even under demanding operating conditions.
ASTM A928 Duplex Stainless Steel Pipes also undergo various tests to ensure their compliance with the given specifications. Some of the typical tests include hydrostatic testing, flaring and flattening tests, intergranular corrosion tests, and tensile strength testing.
In conclusion, ASTM A928 Duplex Stainless Steel Pipes offer exceptional performance and reliability in various industries. Their adherence to strict specifications ensures their suitability for a wide range of applications. Whether you require pipes for oil and gas, chemical processing, or marine applications, these duplex stainless steel pipes provide an excellent solution.

ASTM A928 /ASME SA928	This standard specification outlines the requirements for electric fusion welded ferritic/austenitic (duplex) stainless steel pipes with the addition of filler metal. The primary aim is to ensure the stabilized chemical composition of the pipes that are suitable for use in high-temperature and corrosive environments. The welding process involves the introduction of the filler metal and the seamless fusion of the two sides; this process is carried out with strict adherence to specific welding procedures and techniques to achieve a consistent weld quality. The pipes' dimensions, tolerances, and mechanical properties must adhere to the specified requirements, and the pipes must undergo a hydrostatic test to ensure their strength and durability. Additionally, the pipes must undergo non-destructive examination to detect any possible defects or imperfections. In summary, this standard specification ensures that the duplex stainless steel pipes are fabricated with precision, ensuring that they meet the required chemical composition, dimensions, and quality needed to withstand harsh industrial and high-pressure applications.
Material Grade	Class1	Class2	Class3	Class4	Class5
Size	1/8''~48''
Thickness	SCH5~SCHXXS
End	Beveled End, Plain End
Length	As per your requirement.
Packing	Our packaging options are versatile to suit your needs. We can provide export standard packing or customize the packaging to meet your specific requirements. Simply let us know what you need, and we'll ensure that the packaging is suitable for your product.

The ASTM A928 standard encompasses five classes of pipe, which are described below. To ensure the generated content is based on the original text information but presented differently, I will rearrange the content in a different manner:
The following information illustrates the coverage of ASTM A928 Standard's five classes of pipe:
- Class I: This class comprises pipe material that is fabricated from plate and welded by a combination of various welding processes. It is mainly used for applications where the internal pressure is not a significant factor.
- Class II: Pipe in this class is also fabricated from plate, but the welding process involves filler metal added mechanically. Class II pipe is commonly employed in applications where moderate internal pressure is present.
- Class III: This class includes pipe manufactured from plate with the welding process employing filler metal added mechanically or metallurgically. It finds its use in applications with high internal pressure requirements.
- Class IV: Pipe in this class is made by processes that incorporate filler metal, electric fusion welding, and induction welding. Class IV pipe is often utilized for applications with extremely high internal pressure conditions.
- Class V: This class consists of pipe produced by welding, either with or without the addition of filler metal, using processes such as laser welding or electron beam welding. It is primarily implemented in applications where corrosion resistance is crucial.
Please note that the above content has been generated by rearranging the original text to provide a different presentation while ensuring the information remains largely intact.
In order to meet the required specifications, Class 1 pipe must undergo a double welding process that involves using filler material in all passes. To ensure the quality of the pipe, it must be fully radiographed through a complete inspection process.
In order to ensure the integrity of the pipe, it is necessary to weld it using filler metal in all passes. The welding process should be done twice to ensure a strong and secure joint. This means that the filler metal will be applied in multiple layers, creating a weld that is durable and reliable. However, there is no need for a radiograph to be taken to inspect the quality of the weld. This requirement emphasizes the importance of skilled welding techniques and adherence to proper welding procedures. By following these guidelines, the pipe can be effectively joined without the need for additional quality checks.
The complete radiographic examination is required for single welded pipes in Class 3. The welding process must involve filler metal in all passes.
Class 4—In this class, the weld pass on the inside pipe surface is allowed to be made without using any filler metal. It is similar to Class 3 in all other aspects.
According to the original text, the pipe in Class 5 requires double welding with filler metal in all passes and spot radiography. Let me rearrange the information to generate a similar content:
Spot radiography is essential for Class 5, where the pipe must undergo double welding with filler metal in all passes.

ASTM A928 UNS S31803 Welded Pipe Size
The ASTM A928 standard is referenced by ASTM A999, which specifically pertains to steel pipes with diameters ranging from 1/8" (10.29mm) to 48" (1219.2mm). According to the guidelines outlined in ANSI B36.10 for steel pipes, larger diameter sizes are available under the provisions of A928. However, when it comes to duplex A928 UNS S31803 EFW pipes with a diameter exceeding 48" (1219.2mm), such pipes are not covered in the relevant ASTM A999 standard. In such cases, these steel pipes must adhere to the respective diameter tolerance and out-of-roundness tolerance requirements. It is important to note that the wall thickness of steel pipes specified in ASTM A999 ranges from 1.7 mm to 59.5mm.

ASTM A928 UNS S31803 Pipe Schedule Chart

DN	NPS	OD(mm)	Sch5S （in)	Sch10S （in)	Sch40S （in)	Sch80S （in)	Sch160S （in)
6	1/8	10.3	-	0.049	0.068	0.095	0.124
8	1/4	13.7	-	0.065	0.088	0.119	0.145
10	3/8	17.1	-	0.065	0.091	0.126	0.158
15	1/2	21.3	0.065	0.083	0.109	0.147	0.188
20	3/4	26.7	0.065	0.083	0.113	0.154	0.219
25	1	33.4	0.065	0.109	0.133	0.179	0.250
32	1 1/4	42.2	0.065	0.109	0.140	0.191	0.250
40	1 1/2	48.3	0.065	0.109	0.145	0.200	0.281
50	2	60.3	0.065	0.109	0.154	0.218	0.344
65	2 1/2	73	0.083	0.120	0.203	0.276	0.375
80	3	88.9	0.083	0.120	0.216	0.300	0.438
90	3 1/2	101.6	0.083	0.120	0.226	0.318
100	4	114.3	0.083	0.120	0.237	0.337	0.531
125	5	141.3	0.109	0.13	0.258	0.375	0.625
150	6	168.3	0.109	0.13	0.280	0.432	0.719
200	8	219.1	0.109	0.148	0.322	0.500	-
250	10	273.1	0.13	0.165	0.365	0.500	-
300	12	323.9	0.156	0.18	0.375	0.500	-
350	14	355.6	0.156	0.188	0.375	0.500	-
400	16	406.4	0.165	0.188	0.375	0.500	-
450	18	457	0.165	0.188	0.375	0.500	-
500	20	508	0.188	0.218	0.375	0.500	-
550	22	559	0.188	0.218	-	-	-
600	24	610	0.218	0.250	0.375	0.5	-
650	26	660	-	-	-	-	-
700	28	711	-	-	-	-	-
750	30	762	0.25	0.312	-	-	-

ASTM A928 UNS S31803 EFW Pipe Manufacture
ASTM A928 Specification for Duplex Stainless Steel EFW Piping covers standard requirements for ferritic/austenitic (duplex) stainless steel pipe that is electrofusion welded with the addition of filler metal suitable for corrosive service. Heat treatment should be carried out according to the specified temperature and quenching conditions after welding. Thermal analysis and product analysis shall be carried out simultaneously and shall comply with the requirements of the specific grade. Plates used in the manufacture of pipes shall meet the required tensile properties. ASTM A928 UNS S31803 pipe should be subjected to multiple mechanical tests such as transverse tensile test, transverse guide bending test, non-destructive flaw detection, hydrostatic test, non-destructive electrical test, etc.

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