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A789/SA789 S31803 DUPLEX 2205 SEAMLESS TYPE HEAT EXCHANGER TUBES

  • A789/SA789 S31803 DUPLEX 2205 SEAMLESS TYPE HEAT EXCHANGER TUBES
Place of Origin CHINA
Brand Name Shangle
Certification PED,IS09001
Model Number 12.7
Minimum Order Quantity Negotiable
Price Negotiable
Packaging Details Woven Packing
Delivery Time 30DAYS
Payment Terms L/C, T/T
Supply Ability 500TONS/30DAYS

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Product Details
Material 304 ,304L 310 321 316 316L Standard AISI, ASTM, DIN, EN, GB
Shape SCH10, SCH20, SCH30, STD, SCH40, SCH60, SCH80 Technique Cold Draw
Application Oil, Petroleum/Power Package Woven Packing
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SEAMLESS HEAT EXCHANGER TUBES

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DUPLEX 2205 HEAT EXCHANGER TUBES

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SEAMLESS Duplex 2205 Pipe
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Product Description

A789/SA789 S31803 DUPLEX 2205 SEAMLESS TYPE HEAT EXCHANGE TUBES

 

 

Duplex stainless steels are called “duplex” because they have a two-phase microstructure consisting of grains of ferritic and austenitic stainless steel. The picture shows the yellow austenitic phase as “islands” surrounded by the blue ferritic phase. When duplex stainless steel is melted it solidifies from the liquid phase to a completely ferritic structure. As the material cools to room temperature, about half of the ferritic grains transform to austenitic grains (“islands”). The result is a microstructure of roughly 50% austenite and 50% ferrite.

Whilst duplex stainless steel are considered resistant to stress corrosion cracking, they are not as resistant to this form of attack as ferritic stainless steel. However, the corrosion resistance of the least resistant Duplex stainless steel is greater than that for the most commonly used grades of stainless steel, i.e. 304 and 316.

Duplex stainless steel are also magnetic, a property that can be used to easily differentiate them from common austenitic grades of stainless.

This aside, the alloy of ASTM A789 UNS S31803 is a cost-effective solution for many purposes, especially since stainless steels belonging to 300 series tend to be sensitive to chloride ion stress related corrosion cracking. The ASTM A789 is a specification which satisfies approved requirements for grades of nominal wall thickness, duplex pipes for those applications which require properties such as - resistance to general corrosion. The specification also places critical emphasis on the resistance of ASTM A789 UNS S32205 to stress related corrosion cracking.

 

 

Chemical Composition

 

Grade   C Mn Si P S Cr Mo Ni N
2205 (UNS S31803) Min Max - 0.030 - 2.00 - 1.00 - 0.030 - 0.020 21.0 - 23.0 2.5 - 3.5 4.5 - 6.5 0.08 - 0.20
2205 (UNS S32205) Min Max - 0.030 - 2.00 - 1.00 - 0.030 - 0.020 22.0 - 23.0 3.0 - 3.5 4.5 - 6.5 0.14 - 0.20

 

 

Mechanical Composition

 

Grade Tensile Strength
(MPa) min		 Yield Strength
0.2% Proof
(MPa) min		 Elongation
(% in 50mm) min		 Hardness
Rockwell C (HR C) Brinell (HB)
UNS S32205/ Duplex 2205 621 448 25 31 max 293 max

 

 

Physical Properties

 

Grade Density
(kg/m3)		 Elastic
Modulus (GPa)		 Mean Co-eff of Thermal Expansion (μm/m/°C) Thermal
Conductivity (W/m.K)		 Specific
Heat
0-100°C ( J/kg.K)		 Electrical
Resistivity
(nΩ.m)
0-100°C 0-315°C 0-538°C at 100°C at 500°C
UNS S32205/ Duplex 2205 782 190 13.7 14.2 - 19 - 418 850

 

 

Grade Specification Comparison

 

Grade UNS No Old British Euronorm Swedish SS Japanese JIS
BS En No Name
2205 S31803/S32205 318S13 - 1.4462 X2CrNiMoN22-5-3 2377 SUS 329J3L

 

 

Possible Alternative Grades

 

Grade Reasons for choosing the grade
904L Better formability is needed, with similar corrosion resistance and lower strength.
UR52N+ High resistance to corrosion is required, e.g. resistance to higher temperature seawater.
6%Mo Higher corrosion resistance is required, but with lower strength and better formability.
316L The high corrosion resistance and strength of 2205 are not needed. 316L is lower cost.

 

 

Application:

  • Petroleum
  • Chemical industry
  • Instrument
  • Industrial transportation
  • Mechanical structure industry
  • Need high corrision ability pipe's industry, such as offshore industry etc

 

 

Advantages:

  • Superior surface finish,
  • Better mechanical property
  • More precise dimension
  • Perfect inspection method and inspection equipment
Tags:

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