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A789/SA789 S31803 DUPLEX 2205 SEAMLESS TYPE HEAT EXCHANGER TUBES

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Wenzhou Shangle Steel Co., Ltd.

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A789/SA789 S31803 DUPLEX 2205 SEAMLESS TYPE HEAT EXCHANGER TUBES

Name: A789SA789 S31803 DUPLEX 2205 SEAMLESS TYPE HEAT EXCHANGER TUBES
Brand: Shangle
Price: 1 USD

Brand Name : Shangle

Model Number : 12.7

Certification : PED,IS09001

Place of Origin : CHINA

MOQ : Negotiable

Price : Negotiable

Payment Terms : L/C, T/T

Supply Ability : 500TONS/30DAYS

Delivery Time : 30DAYS

Packaging Details : Woven Packing

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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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
Grade	UNS No	BS	En	No	Name	Swedish SS	Japanese JIS
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

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