Austenitic
Duplex Steel
Nickel Alloy
Cobalt Alloy

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ASTM A928 UNS S31803 Duplex Stainless Steel EFW Weld Pipe

 

ASTM A928 is an international standard that specifies the production and performance requirements for duplex stainless steel welded pipes.

Key points of ASTM A928 standard:

Applicable duplex stainless steel materials

UNS S31803/S32205 (2205): This is the most common duplex stainless steel, with approximately 22% chromium, 5-6% nickel, and 2-3% molybdenum, giving it excellent resistance to pitting and crevice corrosion.

UNS S32750 (2507): Super duplex stainless steel with higher chromium, nickel, and molybdenum content, possessing stronger corrosion resistance and high strength performance.

UNS S32760: Similar to S32750, it has higher resistance to seawater corrosion and chloride stress corrosion.

Welding process: ASTM A928 is applicable to welded pipes manufactured through automatic welding processes such as arc welding or resistance welding. These pipelines undergo non-destructive testing and heat treatment to ensure the quality of welded joints and material consistency.

Mechanical properties: Dual phase stainless steel material combines the characteristics of austenite and ferrite, with high strength and excellent ductility. Compared to traditional austenitic stainless steel, duplex stainless steel can withstand higher pressure at the same thickness and has reduced brittleness at low temperatures.

 

Specifications :

DNNPS(Inch)D(mm)SCH5SSCH10SSCH40SSTDSCH40SCH80XSSCH80SSCH160XXS
50260.31.652.773.913.913.915.545.545.548.7411.07
652 1/2732.113.055.165.165.167.017.017.019.5314.02
80388.92.113.055.495.495.497.627.627.6211.1315.24
903 1/2101.62.113.055.745.745.748.088.088.08--
1004114.32.113.056.026.026.028.568.568.5613.4917.12
1255141.32.773.46.556.556.559.539.539.5315.8819.05
1506168.32.773.47.117.117.1110.9710.9710.9718.2621.95
2008219.12.773.768.188.188.1812.712.712.723.0122.23
25010273.13.44.199.279.279.2715.0912.712.728.5825.4

 

Duplex Steel 31803 Chemical Composition

Grade

C

Mn

Si

P

S

Cr

Ni

Mo

N

Fe

S31803

0.030 max.

2.00 max.

1.00 max.

0.030 max.

0.020 max.

22.0 – 23.0

4.50 – 6.50

3.0 – 3.5

0.14 – 0.20

63.72 min.

 

duplex steel welded pipe (1).jpg


Why Choose MTSCO Welded Pipe?

1. Highly reliable welded pipe manufacturer -MTSCO invested in a factory with 36 years of experience in pipe making, Huxin Pipe
2. Diversified pipe sizes - MTSCO welded pipes are available in diameters up to 3 meters and hydrostatically tested pipes up to 1.5 meters.
3. Complete production and inspection equipment - such as CNC bending machine, plate shearing machine, 12m annealing furnaces, pickled pool, ultrasonic eddy current integrated machines, physical and chemical lab, etc. The bending machine bends up to a max thickness of 60MM and a length of 12 meters.
4. Complete quality control process--There are full-time MTSCO quality inspectors to control the whole process before/during/after production. And all welded pipes will be 100% filmed.
5. Complete certificates - ISO/PED/AD2000 certificates.

 

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