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ASTM A928 UNS S31803 Duplex Stainless Steel EFW Weld Pipe
SSDWP10 - S32750 / SAF2507 DN300 Big Size Duplex Steel ERW / EFW Welded Pipe
Material: S32205, S31803, 1.4462; S32304, 1.4362, UNS S32304; S32750,1.4410, 2507, F53; S32760, 1.4501;
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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 :
| DN | NPS(Inch) | D(mm) | SCH5S | SCH10S | SCH40S | STD | SCH40 | SCH80 | XS | SCH80S | SCH160 | XXS |
| 50 | 2 | 60.3 | 1.65 | 2.77 | 3.91 | 3.91 | 3.91 | 5.54 | 5.54 | 5.54 | 8.74 | 11.07 |
| 65 | 2 1/2 | 73 | 2.11 | 3.05 | 5.16 | 5.16 | 5.16 | 7.01 | 7.01 | 7.01 | 9.53 | 14.02 |
| 80 | 3 | 88.9 | 2.11 | 3.05 | 5.49 | 5.49 | 5.49 | 7.62 | 7.62 | 7.62 | 11.13 | 15.24 |
| 90 | 3 1/2 | 101.6 | 2.11 | 3.05 | 5.74 | 5.74 | 5.74 | 8.08 | 8.08 | 8.08 | - | - |
| 100 | 4 | 114.3 | 2.11 | 3.05 | 6.02 | 6.02 | 6.02 | 8.56 | 8.56 | 8.56 | 13.49 | 17.12 |
| 125 | 5 | 141.3 | 2.77 | 3.4 | 6.55 | 6.55 | 6.55 | 9.53 | 9.53 | 9.53 | 15.88 | 19.05 |
| 150 | 6 | 168.3 | 2.77 | 3.4 | 7.11 | 7.11 | 7.11 | 10.97 | 10.97 | 10.97 | 18.26 | 21.95 |
| 200 | 8 | 219.1 | 2.77 | 3.76 | 8.18 | 8.18 | 8.18 | 12.7 | 12.7 | 12.7 | 23.01 | 22.23 |
| 250 | 10 | 273.1 | 3.4 | 4.19 | 9.27 | 9.27 | 9.27 | 15.09 | 12.7 | 12.7 | 28.58 | 25.4 |
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. |
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