UNS S31803 Material

1. Standard: ASTM A789/ASME SA789、ASTM A790/ASME SA790、ASTM A928/ASME SA928
2. Size: 1/2''~48''
3. Thickness: 5S, 10S, 40S, 80S, 160S
4. End: Beveled End, Plain End

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Product Introduction

UNS S31803 Material is a duplex stainless steel with 22% chromium content. Grade 2205 steel pipes are resistant to localized corrosion and pitting. Due to the addition of molybdenum in duplex materials, they have very low wear in chloride-rich solutions. The low nickel content in alloy S31803 material makes it lightweight. Compared with the common 304/316 stainless steel grades, it has twice the strength and significantly improved corrosion resistance, and can withstand the high tension and pressure in hydraulic systems.

1.4462 S31803 Duplex Steel Piping Applications:

Chemical Industry
Marine Tools and Equipment
Desalination Plants
Food Industry
Paper and Pulp Industry

Duplex UNS S31803 Material Chemical Composition

Element	Content (%)
Molybdenum, Mo	2.50-3.50
Manganese, Mn	2.0
Silicon, Si	1.0
Nitrogen, N	0.080-0.20
Iron, Fe	63.75-71.92
Chromium, Cr	21.0-23.0
Nickel, Ni	4.50-6.50
Carbon, C	0.030
Phosphorous, P	0.030
Sulfur, S	0.020

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UNS S31803 Duplex Stainless Steel Mechanical Properties

Properties	Metric	Imperial
Elongation at break (in 50 mm)	25.0 %	25.0 %
Hardness, Brinell	293	293
Hardness, Rockwell c	31.0	31.0
Tensile strength at break	621 MPa	90000 psi
Yield strength (@strain 0.200 %)	448 MPa	65000 psi

UNS S31803 Thermal Conductivity

Properties	Metric	Imperial
Thermal expansion co-efficient (@20-100°C/68-212°F)	13.7 µm/m°C	7.60 µin/in°F

Duplex UNS S31803 Properties

Properties	Imperial	Metric
Duplex Steel S31803 Material Density	0.283 lb/in³	7.82 g/cm³

Alloy 2205 S31803 Pipe Applicable Temperature

S31803 duplex steel is generally suitable for use at temperatures between -50°C and 250°C. Otherwise, a transition to brittleness will occur, resulting in lower impact toughness.