S31803 Stainless Steel Pipe

1. Standard: ASTM A789, ASME SA789
2. Size: 1/2''~48''
3. Thickness: SCH5~SCHXXS
4. Thickness: 5S, 10S, 40S, 80S, 160S

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Product Introduction

In harsh industrial environments, pipeline systems are responsible for transporting corrosive media and withstanding high pressure and high temperature. S31803 duplex stainless steel pipe (UNS S31803) has become a key material for solving this engineering problem with its unique performance advantages. Our manufacturers can produce astm a790 uns s31803 seamless and welded pipes to meet industry requirements. Contact us market@htpipe.com for more information and a free quote!

What is S31803 pipe material?

S31803 is not ordinary stainless steel, it is a duplex stainless steel. Its name "duplex" reveals the key to its success: the microstructure consists of approximately 50% ferrite (α) and 50% austenite (γ). This exquisite combination is achieved through precise control of chemical composition (especially nitrogen content) and heat treatment process, giving the material comprehensive performance that exceeds single-phase stainless steel.

Standard Specification for s31803 Ferritic/Austenitic (Duplex) Stainless Steel Pipe

ASTM A928 /ASME SA928	Standard Specification for Ferritic/Austenitic (Duplex) Stainless Steel Pipe Electric Fusion Welded with Addition of Filler Metal1
Material Grade	Class1	Class2	Class3	Class4	Class5
Size	1/8''~48''
Thickness	SCH5~SCHXXS
End	Beveled End,Plain End
Length	As per your requirement.
Packing	Export Standard packing or as per your requirements

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2205 pipe chemical composition

Grade	S31803
C	0.03max
Mn	2.00max
P	0.03max
S	0.02max
Si	1.00max
Ni	4.5–6.5
Cr	21.0–23.0
Mo	2.5–3.5
N	0.08–0.20
Cu	-

1.4410 aisi Strength and toughness

High strength: The ferrite phase provides an extremely high strength foundation. The yield strength of S31803 (≥450 MPa) is usually more than twice that of 304/316 austenitic stainless steel (≥205 MPa), and is even close to the level of some low-alloy steels. This allows the design of thinner-walled pipes, significantly reducing equipment weight, material costs and installation difficulties.

Good toughness: The austenite phase contributes excellent toughness and ductility, especially at low temperatures. This combination of strength and toughness effectively resists impact loads, stress fluctuations and accidental mechanical damage, greatly reduces the risk of brittle fracture, and improves the overall safety and reliability of the pipeline system.

astm s31803 Corrosion resistance

Resistance to chloride stress corrosion cracking (SCC): The ferrite phase of S31803 is naturally highly resistant to SCC, making it far superior to 304/316L in this field, making it an ideal choice for seawater cooling systems, offshore platforms, and chemical plants to handle chlorine-containing solutions.

Resistance to pitting and crevice corrosion: High content of chromium (Cr), molybdenum (Mo), and nitrogen (N) significantly improves its pitting Resistance equivalent (PREN). The PREN value of S31803 is usually between 33-35 (PREN = %Cr + 3.3×%Mo + 16×%N), which is much higher than 316L (~25), making it effectively resistant to localized corrosion in environments with high chloride ion concentrations.

Overall corrosion resistance: It performs well in a variety of acids (such as dilute sulfuric acid, organic acids), alkalis, and salt solutions, and its wear corrosion and corrosion fatigue resistance are also better than ordinary austenitic steels.

uns s31803 f53 weldability and formability

Modern welding technology (such as TIG, PAW, SAW with suitable welding materials) can effectively control the phase balance of the welding heat affected zone (HAZ) to obtain welds that match the properties of the parent material. Although the welding requirements are more stringent than 304/316 (heat input and interlayer temperature need to be controlled), its weldability has been widely verified in engineering practice.

1.4410 material Product Forms

Bar & Rod
Plate & Sheet
Coil & Strip
Pipe & Tube
Fitting: Flange, Tee, Elbow, Reducer etc.
Forging: Ring, Shaft, Circle, Block etc.

Where did s31803 pipe use in Industrial Applications?

Oil and gas: submarine pipelines, downhole tools for acid gas wells.
Chemical equipment: sulfuric acid reactors, phosphoric acid evaporators, pickling equipment.
Nuclear industry: containers and pipelines for nuclear waste treatment systems.
Marine engineering: seawater desalination devices, heat exchangers.
Environmental protection: key components of flue gas desulfurization (FGD) systems.