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SA789 S31803 Duplex Stainless Steel Welded Tube For Heat Exchanger

SA789 S31803 Duplex Stainless Steel Welded Tube For Heat Exchanger

Brand Name : SPEZILLA
Model Number : Seamless Tube
Certification : ISO,SGS,BV,CE
Place of Origin : CHINA
MOQ : Negotiation
Price : Negotiation
Payment Terms : T/T or L/C
Supply Ability : 1000 TONS / MONTH
Delivery Time : 25 DAYS
Materials : S31803
O.D. : 3/4"
W.T. : BWG14
Length MAX : 12000MM Max.
Pipe Finish : TIG Welded
Standard : ASME SA789
Shape : Round
Package : Wooden Case
Application : Heat Exchanger
Product Name : Duplex Stainless Steel Tube
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SA789 S31803 Duplex Stainless Steel Welded Tubing for heat exchanger

S31803 steel is ultra-low carbon dual- phase stainless acid resistant steel. It is provided with excellent pitting corrosion and crevice corrosion resistant performances. In addition, nitrogen, as a strong element that forms and stabilizes austenite, still ensures the existence of certain amount of austenite in the structure even if after welding or heating under high temperature, and makes it difficult to form single-phase ferrite. The dual-phase proportion is not sensitive to the change of heating temperature.


UNS S31803
ASME SA-182 (F51), SA-240, SA-798, SA-790, SA-815
ASTM A182 (F51),A240, A276, A479, A789, A790, A815, A928, A988
SAE J405

UNS S32205
ASME SA-182 (F60), SA-240, SA-798, SA-790, SA-815
ASTM A182 (F60), A240, A276, A479, A480, A798, A790, A815, A928, A988
SAE J405

ERW / Welded tubes in round .

We offer Stainless steel supplies and stainless steel supply items for all stainless steel tube sizes. We are leading stainless steel tube suppliers, stainless steel tubing suppliers.

2205 is a duplex (austenitic-ferritic) stainless steel containing about 40 - 50% ferrite in the annealed condition. 2205 has been a practical solution to chloride stress corrosion cracking problems experienced with 304/304L or 316/316L stainless. The high chromium, molybdenum and nitrogen contents provide corrosion resistance superior to 316/316L and 317L stainless in most environments. 2205 is not suggested for operating temperatures above 600°F.
The design strength of 2205 is significantly higher than 316/316L, often permitting lighter wall construction. 2205 has good notch impact toughness down to temperatures below - 40°F.


  • High resistance to chloride stress corrosion cracking
  • Chloride pitting and crevice corrosion resistance superior to 317L stainless
  • Good general corrosion resistance
  • High strength
  • Good sulfide stress corrosion resistance
  • Useful up to 600°F


  • Chemical process vessels, piping, and heat exchangers
  • FGD scrubber systems
  • Pulp mill digesters, bleach washers, chip presteaming vessels
  • Food process equipment
  • Oil field piping, heat exchangers

Specifications (ASTM/ASME) Duplex Stainless Steel Pipe
AlloyUNS DesignationMaterial
2205S31803/S32205A 240/SA-240A 270A 790/SA-790
A 789/SA-789A928/SA928

Chemical Compositions:

Chemical Composition (%) Duplex Stainless Steel Pipe
UNS DesignationS31803S32205
Carbon (C) max.0.0300.030
Manganese (Mn) max.2.002.00
Phosphorus (P) max.0.0300.030
Sulfur (S) max.0.0200.020
Silicon (Si) max.1.001.00
Chromium (Cr)21.0 - 23.022.0 - 23.0
Nickel (Ni)4.5 - 6.54.5 - 6.5
Molybdenum (Mo)2.5 - 3.53.0 - 3.5
Nitrogen (N)0.08 - 0.200.14 - 0.20
Iron (Fe)BalanceBalance

Product Tags:

stainless steel welded tubes


stainless steel welded pipe

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