Saf2205 Uns S31803/32205 ASME SA182/240/789/790 Duplex Stainless Steel Pipes and Tubes

• Customization: Available
• Application: Automotive Industry, Chemical Industry, Food Industry, Oil and Gas Industry, Pharmaceutical Industry
• Certification: CE, ISO9001
• Model NO.: SAF2205 UNS S31803/32205 Duplex SS Pipe
• Length: 1-50m
• Material: 09cupcrni-a/B
• Outer Diameter: 3.18-810mm
• Type: Seamless Pipe
• Wall Thickness: 0.2-40mm
• Steel Grade: Saf2205 Uns S31803/32205 ASME SA182/240/789/790
• Technique: Hot Rolled/Cold Drawn
• Shape: Round/Customized
• Process: Polished/Solution Treatment
• Condition: Hot Finished/Cold Finished
• End: Plain End/Bevel End
• Usage: Heat Transfer
• Test: BV, SGS Is Available
• Stock: Size Can Customized
• Processing: Customized
• Thickness: 1-150mm
• Used: Factory, Decoration, Food
• Packing: Standard Export Packing
• Delivery Time: 10-30 Working Days
• Size: 1/4"-4" or Custom
• Transport Package: Woven Bag/Wooden Case
• Specification: SCH 5S-SCH160
• Trademark: EZS
• Origin: China
• Production Capacity: 10, 000, 000 Kgs/Year

Product Description

Product Description

 

Product Name	SAF2205 UNS S31803/32205 ASME SA182/240/789/790 Duplex Stainless Steel Pipes and Tubes
Size	OD	3.18-810mm
	Thickness	0.2-40mm
	Max Length	50m
Process	Cold drawn,Hot rolled
Usage	Gas Industry, Oilfield, Thermal power, Oil industry, Shipbuilding, Petrochemical, Tanker, Nuclear , etc
Surface	Pickling and annealing,pickling and annealing+polishing+ EP(Electricity polish)
End	Plain, Beveled with caps
Inspection	With Hydraulic Testing, Ultrasonic testing or X-ray Test
Payment:	L/C at sight, L/C 180 days, T/T, D/P, OA, Western Union,
Port of Shipment	Shanghai port in China

We Supply Super Stainless Steel Pipes and Tubes in Specification ASME SA / ASTM A789, A790, A928 and Grades UNS S32205, UNS S31803, UNS S32750, UNS S32760,  2205,  2507 etc. The grade indicates the testing methods required for a given application.

 

Duplex Stainless Steel Pipes and Tubes

Duplex Stainless Steel Pipe & Tubes Specification	ASTM A789, ASTM A790, ASTM A928, ASME SA789, ASME SA790, ASME SA928
Duplex Stainless Steel Pipe & Tubes Grades	UNS S32205, UNS S31803, UNS S32750, UNS S32760, ® 2205, ® 2507, FERRINOX® 225, AMINOX® 225, ZERON® 100
Duplex Stainless Steel Pipe & Tubes Type	Seamless / Welded / ERW / EFW / Cold Draw / Hot Finish / Cold Finish
Duplex Stainless Steel Pipe & Tubes Outer Diameter Size	Seamless - 1/2" NB TO 18" NB Welded / ERW- 1" NB TO 16" NB EFW - 8" NB TO 110" NB
Duplex Stainless Steel Pipe & Tubes Wall Thickness	Schedule 10 to Schedule 160 (3 mm to 100 mm Thickness)
Duplex Stainless Steel Pipe & Tubes Length	01 Meter to 12.5 Meters, Single Random Length, Double Random Length And Customize Size.
Duplex Stainless Steel Pipe & Tubes Ends	Plain Ends / Beveled Ends
Duplex Stainless Steel Pipe & Tubes Delivery Conditions	As Rolled, Formed, Stress Relieved, Annealed, Hardened, Tempered, Cold Draw, Bright Annealed
Duplex Stainless Steel Pipe & Tubes Coating	Electropolish, Mechanical Polish, Satin Finish, Passivated
Duplex Stainless Steel Pipe & Tubes Other Testing	Product Analysis, Transverse Tension Test, Flattening Test, Etching Test, Radiograph HIC Examination, Stabilizing Heat Treatment, Intergranular Corrosion Test, Weld Decay Test, Magnetic Particle Detection, Grain Size Test, NACE 0175, Dual Grade, PWHT (POST WELD HEAT TREATMENT), Flare Test, Bend Test, Hardness Test, Tensile Test etc
Duplex Stainless Steel Pipe & Tubes Dimension	All Pipes Is Manufactured and Inspected / Tested to the Relevant standards including ASTM And ASME
Duplex Stainless Steel Pipe & Tubes Value Added Services	Draw / Expansion / Machining / Sand Blasting / Shot Blasting / Heat Treatment
Duplex Stainless Steel Pipe & Tubes Packaging	Loose / Bundle / Wooden Pallet / Wooden box-a / Plastic Cloth Wraps / Plastic End Caps / Beveled Protector
Duplex Stainless Steel Pipe & Tubes Shipment & Transportation	By Road - Truck / Train, By Sea - Break-bulk Conventional Vessel / FCL (Full Container Load) / LCL (Less Container Load) / 20 Feet Container / 40 Feet Container / 45 Feet Container / High Cube Container / Open Top Container, By Air - Freighter Civil Passenger and Cargo Planes
Duplex Stainless Steel Pipe & Tubes Material Test Certificate	Manufacturer Test Certificate As Per EN10204 3.1, 3.2 / Laboratory Test Certificate From NABL Approved Lab. / Under Third Party Inspection Agency Like SGS, TUV, DNV, LLOYDS, ABS ETC

 

1. Introduction

Saf2205, with UNS designations S31803 and S32205, is a duplex (austenitic - ferritic) stainless steel pipe. This type of steel combines the beneficial properties of both austenitic and ferritic stainless steels, resulting in a material with excellent corrosion resistance, high mechanical strength, and good weldability.

2. Chemical Composition

The chemical composition of Saf2205 Uns S31803/32205 stainless steel pipe is carefully balanced to achieve its remarkable properties. The main elements and their typical ranges are presented in the following table:

Element	Content Range
Carbon (C)	≤0.03%
Silicon (Si)	≤1.0%
Manganese (Mn)	≤2.0%
Phosphorus (P)	≤0.03%
Sulfur (S)	≤0.02%
Chromium (Cr)	21.0 - 23.0%
Nickel (Ni)	4.5 - 6.5%
Molybdenum (Mo)	2.5 - 3.5%
Nitrogen (N)	0.08 - 0.20%

Chromium provides corrosion resistance by forming a passive oxide layer on the surface. Nickel enhances toughness and ductility, while molybdenum further improves resistance to pitting and crevice corrosion. Nitrogen is added to increase strength and improve the stability of the austenitic phase.


3. Mechanical Properties

Saf2205 stainless steel pipe exhibits outstanding mechanical properties, making it suitable for various demanding applications. The key mechanical properties are as follows:

Property	Value
Tensile Strength	≥620 MPa
Yield Strength	≥450 MPa
Elongation at Break	≥25%
Hardness (Brinell)	≤290 HB

The high tensile and yield strengths of Saf2205 are approximately twice those of austenitic stainless steels like 304 or 316. This allows for the design of lighter and more cost - effective structures while maintaining high levels of safety and reliability. The good elongation and relatively low hardness ensure good formability and workability during manufacturing processes.

4. Corrosion Resistance
4.1 General Corrosion Resistance
Saf2205 shows excellent resistance to general corrosion in a wide range of environments. The combined effect of chromium, molybdenum, and nitrogen in its composition provides a high level of protection against oxidation and chemical attack. It outperforms many common stainless steels in terms of general corrosion resistance, especially in acidic and chloride - containing environments.

4.2 Pitting and Crevice Corrosion Resistance
The PREN (Pitting Resistance Equivalent Number) of Saf2205 is typically ≥34. This high PREN value indicates its strong resistance to pitting and crevice corrosion. Pitting and crevice corrosion are major concerns in applications where the material is exposed to chloride - rich media, such as seawater or certain industrial process fluids. The presence of molybdenum and nitrogen in Saf2205 helps to prevent the initiation and growth of pits and crevices, ensuring long - term integrity of the pipe.

4.3 Stress Corrosion Cracking Resistance
One of the most significant advantages of Saf2205 is its high resistance to stress corrosion cracking (SCC) in chloride - bearing and hydrogen - sulfide - containing environments. The duplex microstructure of the steel, with its balanced austenite - ferrite phases, effectively inhibits the propagation of cracks under stress. This makes Saf2205 an ideal choice for applications in the oil and gas industry, where SCC is a common and serious problem.

5. Physical Properties

5.1 Thermal Conductivity

The thermal conductivity of Saf2205 is relatively high compared to some other stainless steels. This property allows for efficient heat transfer in applications such as heat exchangers. The typical thermal conductivity value is around 19 W/(m·K), which is beneficial for maintaining temperature control in various industrial processes.

5.2 Thermal Expansion

The thermal expansion coefficient of Saf2205 is lower than that of austenitic stainless steels. This characteristic provides certain design advantages, especially in applications where dimensional stability is crucial. Lower thermal expansion helps to reduce the risk of thermal stress - induced failures and ensures better fit - up and performance of the pipes in systems subject to temperature variations.

6. Weldability

Saf2205 stainless steel pipe has good weldability, which is essential for its fabrication and installation in various applications. It can be welded using common welding methods such as TIG (Tungsten Inert Gas) and MIG (Metal Inert Gas) welding. However, it is important to use appropriate welding procedures and filler materials to maintain the integrity of the duplex microstructure and the excellent properties of the base metal. Recommended filler materials for welding Saf2205 are often of the 2209 type, which have a similar chemical composition to ensure compatibility and good mechanical and corrosion properties in the weld zone.

7. Applications

Due to its exceptional combination of properties, Saf2205 Uns S31803/32205 stainless steel pipe finds wide applications in many industries:

7.1 Oil and Gas Industry

• Production pipes in oil and gas wells, especially in sour gas environments where resistance to hydrogen sulfide and chloride - induced corrosion is required.

• Pipelines for transporting oil and gas, as the high strength and corrosion resistance ensure long - term reliability and reduce maintenance costs.

• Equipment in refineries, such as heat exchangers, where the material can withstand the harsh chemical environment.

7.2 Chemical Industry

• Pipes and vessels for transporting and storing corrosive chemicals, including acids, alkalis, and chloride - containing solutions.

• Reactors and processing equipment where high temperature and corrosion resistance are necessary.

7.3 Marine and Offshore Industry

• Seawater intake and discharge pipes, as the steel's resistance to chloride - induced corrosion makes it suitable for use in seawater.

• Structural components of offshore platforms, where the high mechanical strength and corrosion resistance are crucial for withstanding the harsh marine environment.

7.4 Power Generation

• Heat exchangers in power plants, both in conventional and renewable energy applications, due to its good heat transfer properties and corrosion resistance.

• Pipes for transporting cooling water, especially in plants located near the sea or in areas with high - chloride water sources.

7.5 Environmental Protection

• Pipes and equipment in wastewater treatment plants, where the material can resist the corrosive effects of various chemicals and biological agents present in wastewater.

• Components in flue gas desulfurization systems, which are exposed to highly corrosive environments.

8. Advantages over Other Stainless Steels

8.1 Cost - Effectiveness

Compared to some high - alloy stainless steels, Saf2205 offers a good balance between performance and cost. While it may be more expensive than some common stainless steels like 304 or 316, its superior corrosion resistance and mechanical properties often result in lower overall life - cycle costs. The longer service life and reduced maintenance requirements make it a cost - effective choice for applications where durability is essential.

8.2 Performance in Aggressive Environments

Saf2205 outperforms many other stainless steels in aggressive environments, such as those with high chloride content or exposure to hydrogen sulfide. Its resistance to stress corrosion cracking, pitting, and crevice corrosion makes it a preferred option in industries where these types of corrosion are prevalent. In contrast, austenitic stainless steels like 304 and 316 may experience significant corrosion and failure in such conditions.

8.3 Mechanical Strength

The high mechanical strength of Saf2205, approximately twice that of austenitic stainless steels, allows for the use of thinner - walled pipes in some applications. This not only reduces material costs but also results in lighter structures, which can be beneficial in terms of transportation, installation, and overall system design.

9. Conclusion

Saf2205 Uns S31803/32205 stainless steel pipe is a high - performance material with a unique combination of mechanical, corrosion resistance, and physical properties. Its balanced duplex microstructure, optimized chemical composition, and good weldability make it suitable for a wide range of applications in industries where durability, reliability, and resistance to harsh environments are crucial. As technology continues to advance and industries demand more efficient and long - lasting materials, Saf2205 is likely to see even greater use in the future, playing a significant role in ensuring the integrity and performance of various engineering systems.

 

 

 

 

 

 

 

 

 

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