ASTM A789 / ASME SA789 UNS S31803 Duplex Steel Seamless And Welded Tube For Boiler
| Product Name: | Boiler Tube | Standard: | ASTM A789 / ASME SA789 |
|---|---|---|---|
| Material: | Duplex Steel | End: | Plain Ends/ Beveled Ends |
| Form: | Straight &U Bend | Type: | Seamless &Welded |
| Packing: | Plywood Case,Bundle | ||
| High Light: |
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ASTM A789 / ASME SA789 S31803 Duplex Steel Tube
ASTM A789 S31803 is a standard specification for seamless and welded ferritic/austenitic stainless steel tubing for general service. S31803 is a duplex stainless steel, which means it has a two-phase microstructure consisting of both austenitic and ferritic phases. This type of steel offers excellent corrosion resistance and high strength, making it suitable for use in a wide range of applications, including chemical processing, oil and gas, and marine environments. The ASTM A789 specification covers tubes in sizes ranging from 1/8 inch to 5 inches in outside diameter, with wall thicknesses ranging from 0.015 inch to 0.500 inch.
Chemical Composition of ASTM A789 S31803
| Grade | C | Mn | S | P | Si | Ni | Cr | Mo | N | |
| S31803 | Min | 4.5 | 21.0 | 2.5 | 0.08 | |||||
| Max | 0.03 | 2.0 | 0.02 | 0.03 | 1.0 | 6.5 | 23.0 | 3.5 | 0.20 |
Mechanical Properies of ASTM A789 S31803
| Grade | Tensile Str Ksi(Mpa) | Yield Str Ksi(Mpa) | Elongation(%) | Brinell(HBW) | Rockwell C(HRC) |
| S31803 | ≥90(620) | ≥65(450) | ≥25 | ≥290 | ≥30 |
Wall Thickness Tolerance of ASTM A789
| OD Range | TYPE | Wall Thickness Tolerance | |
| Average | Mln. | ||
| 0~12.7mm (Incl.) | SMLS&WLD | (+/-15%) | (0,+30%) |
| 12.7~38.1mm (Incl.) | SMLS&WLD | (+/-10%) | (0,+20%) |
| 38.1~88.9mm (Incl.) | SMLS&WLD | (+/-10%) | (0,+20%) |
| 88.9~139.7mm(Incl.) | SMLS&WLD | (+/-10%) | (0,+20%) |
| 139.7~203.2mm(Incl.) | SMLS&WLD | (+/-10%) | (0,+20%) |
Length Tolerance of ASTM A789
| Length Tolerance | |||
| Range(m) | TYPE | OD range | Tolerance |
| 0~24ft (7.3m Incl.) | SMLS+Hot Finished | All Sizes | 0,+5mm |
| 0~24ft (7.3m Incl.) | SMLS+Cold Finished | <50.8mm | 0,+3mm |
| 0~24ft (7.3m Incl.) | SMLS+Cold Finished | 50.8mm(Incl.) to Up | 0,+5mm |
| 0~24ft (7.3m Incl.) | WLD | <50.8mm | 0,+3mm |
| 0~24ft (7.3m Incl.) | WLD | 50.8mm(Incl.) to Up | 0,+5mm |
Uses&Application
1>.Chemical Processing: S31803 tubing is used in chemical processing plants for handling corrosive chemicals and fluids. Its excellent corrosion resistance helps prevent material degradation and ensures the integrity of the process.
2>.Oil and Gas Industry: The duplex stainless steel S31803 is widely used in the oil and gas industry for applications such as offshore platforms, subsea pipelines, and refineries. Its high strength and resistance to chloride-induced stress corrosion cracking make it suitable for harsh environments.
3>.Desalination Plants: S31803 tubing is utilized in desalination plants for seawater intake and brine outflow systems. Its corrosion resistance and resistance to pitting and crevice corrosion make it ideal for such applications.
4>.Heat Exchangers: Duplex stainless steel tubing is commonly employed in heat exchangers due to its high thermal conductivity and resistance to corrosion. It is used in both shell-and-tube and plate heat exchangers.
5>.Pulp and Paper Industry: S31803 tubing is used in the pulp and paper industry for various applications, including chemical recovery systems, digesters, and bleach plants. Its resistance to corrosion and high strength make it suitable for handling corrosive chemicals and high-temperature environments.
6>.Marine Applications: Due to its resistance to corrosion in marine environments, S31803 tubing is used in shipbuilding, offshore structures, and other marine applications where exposure to seawater is a concern.
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