Duplex Stainless Steel Pipe – Supplier of Quality Forged Fittings-Flanges https://www.zzsteels.com Worldwide Pipe Fittings Exporter Wed, 24 Sep 2025 08:43:50 +0000 zh-Hans hourly 1 https://wordpress.org/?v=6.9 ASTM A790UNS S31803Duplex Stainless Steel Pipe Order https://www.zzsteels.com/2025/06/30/astm-a790uns-s31803duplex-stainless-steel-pipe-order/ Mon, 30 Jun 2025 02:00:00 +0000 https://www.zzsteels.com/?p=6882 Wall Thickness (WT): Measured with a thickness gauge to […]

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]]> ASTM A790 UNS S31803 Duplex Stainless Steel Pipe

ASTM A790 UNS S31803 Duplex Stainless Steel Pipe Specification

 
Processing Method Seamless and Welded
Size Range 1/8” – 30” / DN6 – 750
Thickness Schedule SCH 10S- SCH 160, XXS
Length 6m or 12 m or Random
Standard ASME B36.19
Surface Treatment Polish , Mirror , Epoxy Powder FBE, 2PE, 3PE Coating
Material Grade ASTM A790 UNS S32205, S31803, 32750, 32760, S32550

Main Features of UNS S31803 Duplex Stainless Steel Pipe

  High corrosion resistance: Excellent resistance to a variety of corrosive media (especially chloride environments), including resistance to chloride stress corrosion cracking, pitting and crevice corrosion. High strength: The yield strength is usually about twice that of common austenitic stainless steel (such as 304L/316L), which means that thinner wall thickness can be allowed in the design, thereby reducing weight and possibly reducing costs. Duplex structure: Composed of approximately half austenite and half ferrite, this unique microstructure gives it the advantages of both austenite (toughness, corrosion resistance) and ferrite (high strength, stress corrosion resistance). Good weldability: Compared with other high-strength materials, it has better weldability. Wide application: Commonly used in industries with high requirements for corrosion resistance and strength, such as oil and gas, chemical industry, seawater desalination, and papermaking.  

ASTM A790 UNS S31803 Pipe Chemical Composition

 
CHEMICAL LIMITS C Mn P S Si Ni Cr Mo N
ASTM A790 S31803 MIN 4.5 21.00 2.50 0.08
MAX 0.03 2.00 0.03 0.02 1.00 6.5 23.00 3.50 0.20

ASTM A790 UNS S31803 Pipe Mechanical Property

 
MATERIAL T.S (MPA) Y.S (MPA) EL % HARDNESS
ASTM A790 S31803 620min 450min 25min 290max

Duplex Stainless Steel Pipe Dimension

  ASTM A790 UNS S31803 duplex stainless steel pipe is a general purpose stainless steel pipe used in different industries. Its diameter ranges from 1/8” to 30”, and thickness ranges from SCH 5S to SCH 80S.
Stainless Steel Pipe (ASME B 36.19M)
Nominal Size OD Sch5s Sch10s Sch40s Sch80s
DN NPS 0 T kg/m T kg/m T kg/m T kg/m
6  1/8 10.3 1.24 0.28 1.73 0.37 2.41 0.47
8  1/4 13.7 1.65 0.49 2.24 0.63 3.02 0.8
10  3/8 17.1 1.65 0.63 2.31 0.84 3.2 1.1
15  1/2 21.3 1.65 0.82 2.11 1 2.77 1.27 3.73 1.62
20  3/4 26.7 1.65 1.04 2.11 1.28 2.87 1.69 3.91 2.2
25 1 33.4 1.65 1.33 2.77 2.09 3.38 2.5 4.55 3.24
32 1 1/4 42.2 1.65 1.68 2.77 2.7 3.56 3.39 4.85 4.47
40 1 1/2 48.3 1.65 1.95 2.77 3.11 3.68 4.05 5.08 5.41
50 2 60.3 1.65 2.44 2.77 3.93 3.91 5.44 5.54 7.48
65 2 1/2 73.0 2.11 3.77 3.05 5.26 5.16 8.63 7.01 11.41
80 3 88.9 2.11 4.6 3.05 6.45 5.49 11.29 7.62 15.27
90 31/2 101.6 2.11 5.29 3.05 7.4 5.74 13.57 8.08 18.63
100 4 114.3 2.11 5.96 3.05 8.36 6.02 16.07 8.56 22.32
125 5 141.3 2.77 9.67 3.4 11.57 6.55 21.77 9.53 30.97
150 6 168.3 2.77 11.55 3.4 13.48 7.11 28.26 10.97 42.56
200 8 219.1 2.77 15.09 3.76 19.96 8.18 42.55 12.7 64.64
250 10 273.1 3.4 23.08 4.19 27.78 9.27 60.31 12.7 96.01
300 12 323.9 3.96 31.89 4.57 36 9.53 73.88 12.7 132.08
350 14 355.6 3.96 35.06 4.78 41.3
400 16 406.4 4.19 42.41 4.78 47.29
450 18 457.2 4.19 47.77 4.78 53.26
500 20 508 4.78 60.46 5.54 68.61
550 22 558.8 4.78 66.57 5.54 75.53
600 24 609.6 5.54 84.16 6.35 94.45
750 30 762 6.35 120.72 7.92 147.36

ASTM A790 UNS S31803 Duplex Stainless Steel Pipe Applications

Oil and gas industry: for offshore platforms, oil and gas extraction, transportation and processing equipment, especially in harsh environments containing chlorides. Chemical and petrochemical industry: for pipelines, tanks and heat exchangers handling corrosive chemicals such as acids, alkalis and salts. Desalination and water treatment: ideal for use in desalination plants, sewage treatment plants and seawater cooling systems. Paper & Pulp Industry: Used in bleaching equipment, digesters and related piping, it can effectively resist corrosive chemicals. Structures & Buildings: Structural components in coastal or corrosive environments where high strength and corrosion resistance are required.

Dimensional Inspection

  Outside diameter (OD): Measured with calipers or OD gauge to check whether it is within the standard tolerance. Wall Thickness (WT): Measured with a thickness gauge to ensure that the wall thickness at each point meets the standard wall thickness tolerance requirements (ASTM A312 has positive and negative deviation requirements for wall thickness, and the negative deviation of the nominal wall thickness usually does not exceed 12.5%). Chemical Composition Analysis: Ensure that the chemical composition of the material meets the requirements of the grades in the ASTM A790 standard. Key elements include carbon (C), manganese (Mn), phosphorus (P), sulfur (S), silicon (Si), chromium (Cr), nickel (Ni), and molybdenum (Mo).
ASTM A790 UNS S31803 Duplex Stainless Steel Pipe

ASTM A790 UNS S31803 Duplex Stainless Steel Pipe Specification

 
Processing Method Seamless and Welded
Size Range 1/8” – 30” / DN6 – 750
Thickness Schedule SCH 10S- SCH 160, XXS
Length 6m or 12 m or Random
Standard ASME B36.19
Surface Treatment Polish , Mirror , Epoxy Powder FBE, 2PE, 3PE Coating
Material Grade ASTM A790 UNS S32205, S31803, 32750, 32760, S32550

Main Features of UNS S31803 Duplex Stainless Steel Pipe

  High corrosion resistance: Excellent resistance to a variety of corrosive media (especially chloride environments), including resistance to chloride stress corrosion cracking, pitting and crevice corrosion. High strength: The yield strength is usually about twice that of common austenitic stainless steel (such as 304L/316L), which means that thinner wall thickness can be allowed in the design, thereby reducing weight and possibly reducing costs. Duplex structure: Composed of approximately half austenite and half ferrite, this unique microstructure gives it the advantages of both austenite (toughness, corrosion resistance) and ferrite (high strength, stress corrosion resistance). Good weldability: Compared with other high-strength materials, it has better weldability. Wide application: Commonly used in industries with high requirements for corrosion resistance and strength, such as oil and gas, chemical industry, seawater desalination, and papermaking.  

ASTM A790 UNS S31803 Pipe Chemical Composition

 
CHEMICAL LIMITS C Mn P S Si Ni Cr Mo N
ASTM A790 S31803 MIN 4.5 21.00 2.50 0.08
MAX 0.03 2.00 0.03 0.02 1.00 6.5 23.00 3.50 0.20

ASTM A790 UNS S31803 Pipe Mechanical Property

 
MATERIAL T.S (MPA) Y.S (MPA) EL % HARDNESS
ASTM A790 S31803 620min 450min 25min 290max

Duplex Stainless Steel Pipe Dimension

  ASTM A790 UNS S31803 duplex stainless steel pipe is a general purpose stainless steel pipe used in different industries. Its diameter ranges from 1/8” to 30”, and thickness ranges from SCH 5S to SCH 80S.
Stainless Steel Pipe (ASME B 36.19M)
Nominal Size OD Sch5s Sch10s Sch40s Sch80s
DN NPS 0 T kg/m T kg/m T kg/m T kg/m
6  1/8 10.3 1.24 0.28 1.73 0.37 2.41 0.47
8  1/4 13.7 1.65 0.49 2.24 0.63 3.02 0.8
10  3/8 17.1 1.65 0.63 2.31 0.84 3.2 1.1
15  1/2 21.3 1.65 0.82 2.11 1 2.77 1.27 3.73 1.62
20  3/4 26.7 1.65 1.04 2.11 1.28 2.87 1.69 3.91 2.2
25 1 33.4 1.65 1.33 2.77 2.09 3.38 2.5 4.55 3.24
32 1 1/4 42.2 1.65 1.68 2.77 2.7 3.56 3.39 4.85 4.47
40 1 1/2 48.3 1.65 1.95 2.77 3.11 3.68 4.05 5.08 5.41
50 2 60.3 1.65 2.44 2.77 3.93 3.91 5.44 5.54 7.48
65 2 1/2 73.0 2.11 3.77 3.05 5.26 5.16 8.63 7.01 11.41
80 3 88.9 2.11 4.6 3.05 6.45 5.49 11.29 7.62 15.27
90 31/2 101.6 2.11 5.29 3.05 7.4 5.74 13.57 8.08 18.63
100 4 114.3 2.11 5.96 3.05 8.36 6.02 16.07 8.56 22.32
125 5 141.3 2.77 9.67 3.4 11.57 6.55 21.77 9.53 30.97
150 6 168.3 2.77 11.55 3.4 13.48 7.11 28.26 10.97 42.56
200 8 219.1 2.77 15.09 3.76 19.96 8.18 42.55 12.7 64.64
250 10 273.1 3.4 23.08 4.19 27.78 9.27 60.31 12.7 96.01
300 12 323.9 3.96 31.89 4.57 36 9.53 73.88 12.7 132.08
350 14 355.6 3.96 35.06 4.78 41.3
400 16 406.4 4.19 42.41 4.78 47.29
450 18 457.2 4.19 47.77 4.78 53.26
500 20 508 4.78 60.46 5.54 68.61
550 22 558.8 4.78 66.57 5.54 75.53
600 24 609.6 5.54 84.16 6.35 94.45
750 30 762 6.35 120.72 7.92 147.36

ASTM A790 UNS S31803 Duplex Stainless Steel Pipe Applications

Oil and gas industry: for offshore platforms, oil and gas extraction, transportation and processing equipment, especially in harsh environments containing chlorides. Chemical and petrochemical industry: for pipelines, tanks and heat exchangers handling corrosive chemicals such as acids, alkalis and salts. Desalination and water treatment: ideal for use in desalination plants, sewage treatment plants and seawater cooling systems. Paper & Pulp Industry: Used in bleaching equipment, digesters and related piping, it can effectively resist corrosive chemicals. Structures & Buildings: Structural components in coastal or corrosive environments where high strength and corrosion resistance are required. On June 3, 2025, we received a request for quotation from a new customer in China for a batch of ASTM A790 UNS S31803 duplex stainless steel pipe. The customer has strict requirements on the specification, tolerance, surface quality and third-party testing and certification of the tubes, and focuses on the product’s corrosion resistance and delivery lead time. ZIZI is a company specializing in the production and processing of pipes and fittings. The pipes and pipe fittings we produce are mainly used in chemical, petroleum, natural gas, water conservancy, electric power, marine engineering and other fields. The products mainly include seamless pipes, welded pipes, butt-welded pipe fittings, high-pressure forged pipe fittings and flanges of various sizes. The materials include carbon steel, stainless steel, alloy steel, low-temperature steel, duplex steel, base alloy, etc.

Dimensional Inspection

  Outside diameter (OD): Measured with calipers or OD gauge to check whether it is within the standard tolerance. Wall Thickness (WT): Measured with a thickness gauge to ensure that the wall thickness at each point meets the standard wall thickness tolerance requirements (ASTM A312 has positive and negative deviation requirements for wall thickness, and the negative deviation of the nominal wall thickness usually does not exceed 12.5%). Chemical Composition Analysis: Ensure that the chemical composition of the material meets the requirements of the grades in the ASTM A790 standard. Key elements include carbon (C), manganese (Mn), phosphorus (P), sulfur (S), silicon (Si), chromium (Cr), nickel (Ni), and molybdenum (Mo).
ASTM A790 UNS S31803 Duplex Stainless Steel Pipe

ASTM A790 UNS S31803 Duplex Stainless Steel Pipe Specification

 
Processing Method Seamless and Welded
Size Range 1/8” – 30” / DN6 – 750
Thickness Schedule SCH 10S- SCH 160, XXS
Length 6m or 12 m or Random
Standard ASME B36.19
Surface Treatment Polish , Mirror , Epoxy Powder FBE, 2PE, 3PE Coating
Material Grade ASTM A790 UNS S32205, S31803, 32750, 32760, S32550

Main Features of UNS S31803 Duplex Stainless Steel Pipe

  High corrosion resistance: Excellent resistance to a variety of corrosive media (especially chloride environments), including resistance to chloride stress corrosion cracking, pitting and crevice corrosion. High strength: The yield strength is usually about twice that of common austenitic stainless steel (such as 304L/316L), which means that thinner wall thickness can be allowed in the design, thereby reducing weight and possibly reducing costs. Duplex structure: Composed of approximately half austenite and half ferrite, this unique microstructure gives it the advantages of both austenite (toughness, corrosion resistance) and ferrite (high strength, stress corrosion resistance). Good weldability: Compared with other high-strength materials, it has better weldability. Wide application: Commonly used in industries with high requirements for corrosion resistance and strength, such as oil and gas, chemical industry, seawater desalination, and papermaking.  

ASTM A790 UNS S31803 Pipe Chemical Composition

 
CHEMICAL LIMITS C Mn P S Si Ni Cr Mo N
ASTM A790 S31803 MIN 4.5 21.00 2.50 0.08
MAX 0.03 2.00 0.03 0.02 1.00 6.5 23.00 3.50 0.20

ASTM A790 UNS S31803 Pipe Mechanical Property

 
MATERIAL T.S (MPA) Y.S (MPA) EL % HARDNESS
ASTM A790 S31803 620min 450min 25min 290max

Duplex Stainless Steel Pipe Dimension

  ASTM A790 UNS S31803 duplex stainless steel pipe is a general purpose stainless steel pipe used in different industries. Its diameter ranges from 1/8” to 30”, and thickness ranges from SCH 5S to SCH 80S.
Stainless Steel Pipe (ASME B 36.19M)
Nominal Size OD Sch5s Sch10s Sch40s Sch80s
DN NPS 0 T kg/m T kg/m T kg/m T kg/m
6  1/8 10.3 1.24 0.28 1.73 0.37 2.41 0.47
8  1/4 13.7 1.65 0.49 2.24 0.63 3.02 0.8
10  3/8 17.1 1.65 0.63 2.31 0.84 3.2 1.1
15  1/2 21.3 1.65 0.82 2.11 1 2.77 1.27 3.73 1.62
20  3/4 26.7 1.65 1.04 2.11 1.28 2.87 1.69 3.91 2.2
25 1 33.4 1.65 1.33 2.77 2.09 3.38 2.5 4.55 3.24
32 1 1/4 42.2 1.65 1.68 2.77 2.7 3.56 3.39 4.85 4.47
40 1 1/2 48.3 1.65 1.95 2.77 3.11 3.68 4.05 5.08 5.41
50 2 60.3 1.65 2.44 2.77 3.93 3.91 5.44 5.54 7.48
65 2 1/2 73.0 2.11 3.77 3.05 5.26 5.16 8.63 7.01 11.41
80 3 88.9 2.11 4.6 3.05 6.45 5.49 11.29 7.62 15.27
90 31/2 101.6 2.11 5.29 3.05 7.4 5.74 13.57 8.08 18.63
100 4 114.3 2.11 5.96 3.05 8.36 6.02 16.07 8.56 22.32
125 5 141.3 2.77 9.67 3.4 11.57 6.55 21.77 9.53 30.97
150 6 168.3 2.77 11.55 3.4 13.48 7.11 28.26 10.97 42.56
200 8 219.1 2.77 15.09 3.76 19.96 8.18 42.55 12.7 64.64
250 10 273.1 3.4 23.08 4.19 27.78 9.27 60.31 12.7 96.01
300 12 323.9 3.96 31.89 4.57 36 9.53 73.88 12.7 132.08
350 14 355.6 3.96 35.06 4.78 41.3
400 16 406.4 4.19 42.41 4.78 47.29
450 18 457.2 4.19 47.77 4.78 53.26
500 20 508 4.78 60.46 5.54 68.61
550 22 558.8 4.78 66.57 5.54 75.53
600 24 609.6 5.54 84.16 6.35 94.45
750 30 762 6.35 120.72 7.92 147.36

ASTM A790 UNS S31803 Duplex Stainless Steel Pipe Applications

Oil and gas industry: for offshore platforms, oil and gas extraction, transportation and processing equipment, especially in harsh environments containing chlorides. Chemical and petrochemical industry: for pipelines, tanks and heat exchangers handling corrosive chemicals such as acids, alkalis and salts. Desalination and water treatment: ideal for use in desalination plants, sewage treatment plants and seawater cooling systems. Paper & Pulp Industry: Used in bleaching equipment, digesters and related piping, it can effectively resist corrosive chemicals. Structures & Buildings: Structural components in coastal or corrosive environments where high strength and corrosion resistance are required.

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]]> ASTM A790 Pipe https://www.zzsteels.com/2024/12/20/astm-a790-pipe/ Fri, 20 Dec 2024 07:32:21 +0000 https://www.zzsteels.com/?p=6047 ASTM A790 pipe is a special type of stainless steel pip […]

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]]> ASTM A790 pipe is a special type of stainless steel pipe, whose micro structure is mainly composed of austenite and ferrite. The austenite phase provides good toughness, corrosion resistance, high strength and good processability, while the ferrite phase enhances the steel’s resistance to stress corrosion cracking, thermal conductivity and resistance to chloride stress corrosion cracking. Therefore, duplex stainless steel pipes usually have the characteristics of high strength, good corrosion resistance, excellent welding performance and high thermal conductivity.

Duplex stainless steel pipes also have a lower linear expansion coefficient, which makes it have better dimensional stability at high temperatures. These characteristics make duplex stainless steel pipes widely used in petroleum, chemical, seawater desalination, paper making, and many other industrial fields.

ASTM A790 pipe

ASTM A790 Pipe Standard

This specification covers seamless and straight-seam welded ferritic/austenitic steel pipe intended for general corrosive service, with particular emphasis on resistance to stress corrosion cracking. These steels are susceptible to embrittlement if used for prolonged periods at elevated temperatures.

 Appendix X1 of this specification lists the dimensions of welded and seamless stainless steel pipe as shown in ANSI B36.19. Pipe having other dimensions may be furnished provided such pipe complies with all other requirements of this specification.

Features

Material Composition: The standard covers duplex stainless steel, which is characterized by a balanced microstructure of austenite and ferrite. This composition offers superior mechanical properties and corrosion resistance compared to standard austenitic stainless steels.

Seamless and Welded: The specification includes both seamless and welded pipes, offering flexibility in manufacturing and application.

Corrosion Resistance: Duplex stainless steel pipes under this specification exhibit excellent resistance to a wide range of corrosive environments, including chlorides and sulfides, making them ideal for use in harsh conditions.

Mechanical Properties: The duplex structure provides high strength and good impact toughness, which is advantageous in many industrial applications.

Specification of ASTM A790 Pipes

ASTM A790 pipe specifications are mainly applicable to sizes ranging from 1/8”to 30”(DN6 to DN750). The wall thickness of these steel pipes must comply with ASME B36.19 standards, and the wall thickness grades are SCH 10, SCH 20, SCH 40, STD, XS, SCH 100, SCH 120, SCH 160, XXS.

Processing MethodSeamless and Welded
Size Range1/8” – 30” / DN6 – 750
Thickness ScheduleSCH10 SCH20 STD SCH40 SCH60 SCH80 SCHXS SCH100 SCH120 SCH140 SCH160 SCHXXS
Length6m or 12 m or Random
StandardASME B36.19,ASTM A789, ASTM A790, ASTM A928, ASME SA789,
Surface TreatmentPolish , Mirror , Epoxy Powder FBE, 2PE, 3PE Coating
Material GradeASTM A790 S32205, S31803, 32750, 32760, S32550
Pipes EndsPlain Ends / Beveled Ends

ASTM A790 Material Analysis

The chemical composition of ASTM A790 steel pipe mainly includes alloy elements such as chromium, nickel, molybdenum, etc. The reasonable combination of these alloy elements gives the steel pipe excellent corrosion resistance and mechanical properties.

UNSENDINLIMITSCMnPSSiNiCrMoN
ASTM A790 S318031.4462X2CrNiMoN22-5-3MIN     4.5212.50.08
MAX0.0320.030.0216.5233.50.2
ASTM A790 UNS S322051.4462X2CrNiMoN22-5-3MIN     4.52230.14
MAX0.0320.030.0216.5233.50.2
ASTM A790 UNS S327501.441X2CrNiMoN25-7-4MIN     62430.24
MAX0.031.20.0350.020.882650.32
ASTM A790 S32760  MIN      243 
MAX0.0310.03   264

ASTM A790 Pipe Mechanical Property

ASTM A790 material has high strength and good toughness. The tensile strength is above 620 MPa. This high strength property enables the steel pipe to withstand greater pressure and load, and is suitable for high-pressure pipeline systems, petrochemicals and other fields.

MATERIALT.S (MPA)Y.S (MPA)EL %HARDNESS
ASTM A790 S31803620min450min25min290max
ASTM A790 S32205655min450min25 min290max
ASTM A790 S32750800min550min15min300max
ASTM A790 S32760750min550min25min310max

Duplex Stainless Steel Pipes Size Chart

Nominal SizeODSch5sSch10sSch40sSch80s
DNNPS0Tkg/mTkg/mTkg/mTkg/m
6 1/810.3  1.240.281.730.372.410.47
8 1/413.71.650.492.240.633.020.8
10 3/817.11.650.632.310.843.21.1
15 1/221.31.650.822.1112.771.273.731.62
20 3/426.71.651.042.111.282.871.693.912.2
25133.41.651.332.772.093.382.54.553.24
321 1/442.21.651.682.772.73.563.394.854.47
401 1/248.31.651.952.773.113.684.055.085.41
50260.31.652.442.773.933.915.445.547.48
652 1/273.0   2.113.773.055.265.168.637.0111.41
80388.92.114.63.056.455.4911.297.6215.27
9031/2101.62.115.293.057.45.7413.578.0818.63
1004114.32.115.963.058.366.0216.078.5622.32
1255141.32.779.673.411.576.5521.779.5330.97
1506168.32.7711.553.413.487.1128.2610.9742.56
2008219.12.7715.093.7619.968.1842.5512.764.64
25010273.13.423.084.1927.789.2760.3112.796.01
30012323.93.9631.894.57369.5373.8812.7132.08
35014355.63.9635.064.7841.3    
40016406.44.1942.414.7847.29
45018457.24.1947.774.7853.26

Characteristics of Duplex Stainless Steel Pipes

High Precision : ASTM A790 pipes are manufactured with strict dimensional tolerances, ensuring consistent and accurate dimensions along their entire length.

Smooth Surface Finish : These pipes have a smooth surface finish, which is essential for applications where fluid flow or the passage of precision instruments is involved.

Uniform Mechanical Properties : Precise control over the manufacturing process results in uniform mechanical properties, including tensile strength, yield strength, and elongation, which is important for reliable performance.

Customizable : ZIZI can be produced in various sizes, shapes, and grades to meet the specific requirements of different industries and applications.

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