Product Introduction
S31803 duplex stainless steel pipe is a high-strength, corrosion-resistant pipe made of austenite and ferrite. It is suitable for use in industries such as petrochemicals, offshore engineering, pressure piping, and papermaking.
Product Parameters
|
Product Name |
ASTM A789/A790 S31803 Duplex Stainless Steel Pipe |
|
Out Diameter |
10-813mm |
|
Wall Thickness |
0.5-60mm |
|
Material Standard |
ASTM A789, ASTM A790 |
|
Steel Grade |
S31803 |
|
Surface |
Pickling, Solid solution, Polishing |
|
Packing |
Plastic Film, Plastic Cap, Bundle, Woven bag, Wooden Case, Iron Frame |
|
Delivery |
Within 3 days with stock, 15-50 days based on production |
|
Payment |
T/T, D/P, L/C at sight, Usance L/C etc. |
Chemical Requirements
|
Composition, % |
|||||||||||
|
Grade |
C |
Mn |
P |
S |
Si |
Ni |
Cr |
Mo |
N |
Cu |
Others |
|
S31803 |
0.030max |
2.00max |
0.030max |
0.020max |
1.00max |
4.50-6.50 |
21.00-23.00 |
2.50-3.50 |
0.08-0.20 |
|
|
Mechanical Property
|
Grade |
Tensile strength Min Ksi(Mpa) |
Yield strength Min Ksi(Mpa) |
Elongation % min |
Hardness max |
||
|
Brinell HBW |
Rockwell HRB |
Vickers HV |
||||
|
S31803 |
90(620) |
65(450) |
25 |
290 |
30 |
290 |
Product Features
High Strength
S31803 stainless steel pipe boasts a yield strength of ≥450 MPa, twice that of 304 pipe, ensuring stable operation under high-pressure conditions.
Corrosion Resistance
S31803 duplex stainless steel pipe, containing 22% chromium, 5% nickel, and 3% molybdenum, resists chloride pitting and stress corrosion, making it particularly suitable for seawater and acidic environments.
Precision Craftsmanship
S31803 duplex stainless steel pipe utilizes a solution treatment and pickling process, resulting in a smooth surface and an inner wall smoothness of Ra ≤ 0.8 μm, ensuring low fluid flow resistance.
Product Application
Petrochemical Industry
S31803 duplex stainless steel pipe is primarily used for transporting acidic and chloride-containing media, ensuring safe operation of pipeline systems under high temperatures and high pressures.
Marine Engineering
S31803 pipe is used in offshore drilling platforms and seawater cooling systems, effectively resisting seawater corrosion and maintaining long-term stability.
Paper Industry
In pulping and bleaching systems, S31803 pipe is responsible for transporting chlorine-containing and alkaline liquids, ensuring long-term and efficient operation of equipment.
Top 4 Strengths of Hebei Yongqiang Pipeline Co., Ltd.
We offer factory direct pricing.
We hold over 60 utility model patents.
Our products are exported to the Middle East, South America, Southeast Asia, and other regions.
We provide 24/7 pre-sales and after-sales service.
Product Show
Strict quality control is the lifeline of our enterprise. Our company's duplex stainless steel pipes undergo inspection throughout the entire process, from raw materials to production and processing, appearance, size, hydraulic testing, flaw detection, and packaging. Each stage is supervised by dedicated inspectors.
Product Packing
When the inner surface of the steel pipe needs to be cleaned, protective packaging materials can be used. Commonly used protective materials include kraft paper, vapor phase anti-rust paper, greaseproof paper, plastic film, or plastic caps on both ends of the steel pipe. The surface of the steel pipe can also be coated with a protective layer made of corrosion-resistant material, considering the method of application, coating thickness, and ease of removal when necessary.
Why Choose us
- We provide 24/7 service and maintain timely and effective communication with customers.
- We have a comprehensive professional testing process, including raw material testing, production link testing, finished product testing, and packaging testing.
- To ensure product quality, we can invite third-party organizations to test our products.
- We maintain a large stock of products for your emergency needs and have the complete production capacity to satisfy your delivery requirements.
We are experts in ASTM A789/A790 S31803 duplex stainless steel pipe. Welcome to contact us and visit our company.
Email: johnny@yqpipeline.com
WhatsApp: +86 15632733100
Tel: +86 317 6376727
Frequently Asked Questions
1. What is S31803 Duplex Stainless Steel Pipe?
Duplex UNS S31803 is the most common duplex grade in the market with high mechanical strength. It is widely used in Oil & Gas Industry, hydro power, pressure vessels, pulp & Equipment for the Paper Industry, Paper Industry, structural components and chemical tankers.
2. What are the typical applications for S31803 Duplex Stainless Steel Pipe in various industries?
Duplex UNS S31803 is the most common duplex grade in the market with high mechanical strength. It is widely used in Oil & Gas Industry, hydro power, pressure vessels, pulp & Equipment for the Paper Industry, Paper Industry, structural components and chemical tankers.
3. How does the corrosion resistance of S31803 compare to that of other commonly used stainless steels?
It is not uncommon to see the metal used as a practical solution to chloride-induced stress cracking, which is the achilles' heel of stainless steel. It has superior resistance to chloride pitting and crevice corrosion as compared to 317L stainless steel.
4. What makes Duplex Stainless Steel Pipe suitable for high-pressure applications?
In addition, duplex steel pipes have excellent fatigue resistance, meaning they can withstand repeated stress without cracking or breaking. This, coupled with their corrosion resistance, makes them an ideal choice for high-pressure applications.
5. How does the composition of Duplex Stainless Steel Pipe contribute to its corrosion resistance?
The duplex stainless steels are characterized as having both austenite (50%) and ferrite (50%) phases in their microstructure which provide improved corrosion resistance. These alloys contain relatively high amounts of chromium with only enough nickel and austenizers to develop 50% austenite.
6. Are there specific cleaning agents or chemicals that should be avoided when using Duplex Stainless Steel Pipe?
All stainless steel types need restricted exposure to hydrochloric acid or warm/hot sulfuric acid. While a premium (and pricier) stainless steel grade can withstand hot sulfuric acid, extended exposure to acidic solutions with chlorides, such as hydrochloric acid, can lead to pitting across all stainless steel types.
7. What are the benefits and drawbacks of using Duplex Stainless Steel Pipe in extreme climates?
For many applications, duplex stainless steel is the optimum choice for corrosion resistance, strength and cost. However, there are two main disadvantages of these alloys. Firstly, their impact toughness is worse at very low temperatures, so they are not specified for applications below -50degC.
8. How does the weight of Duplex Stainless Steel Pipe compare to other piping systems?
For many applications, duplex stainless steel is the optimum choice for corrosion resistance, strength and cost. However, there are two main disadvantages of these alloys. Firstly, their impact toughness is worse at very low temperatures, so they are not specified for applications below -50degC.
9. How do different grades of Duplex Stainless Steel Pipe vary in terms of chemical and physical properties?
Super duplex stainless steels, on the other hand, contain higher levels of chromium, molybdenum, and nitrogen which significantly enhance their pitting and crevice corrosion resistance compared to regular duplex steels.
10.How does the chloride ion resistance of Duplex Stainless Steel Pipe compare to other stainless steels?
Duplex stainless steels offer superior corrosion resistance to chlorides, common in marine environments, compared to conventional austenitic grades like 304 and 316.
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