ASTM A790 UNS S31803

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

ASTM A790 UNS S31803 is a duplex stainless steel that is a combination of ferrite and austenite microstructures. The chemical composition includes elements such as chromium, nickel, molybdenum, and nitrogen, which provide enhanced corrosion resistance over 304 and 316 stainless steels, such as resistance to pitting, crevice corrosion, and stress corrosion cracking. Our manufacturers can provide both seamless and welded pipe types. We are a duplex S31803 supplier with 15+ export experience, contact us for more information and free quotes!

ASME SA790 UNS S31803 Pipe Applications:

Chemical processing, transportation and storage
Oil and gas exploration
Offshore drilling platforms
Marine environments
Pollution control equipment
Pulp and paper manufacturing
Chemical processing plants

ASME SA 790 S31803 Pipe Mechanical Characteristics

Density	Melting Point	Yield Strength (0.2%Offset)	Tensile Strength	Elongation
7.8 g/cm3	1350 °C (2460 °F)	Psi - 80000 , MPa - 550	Psi - 116000 , MPa - 800	15 %

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ASTM A790 Duplex 2205 Pipe Pressure Rating

Pipe O.D. (In.)	Wall Thickness Of Pipe (Inches)
	0.028	0.035	0.049	0.065	0.083	0.095	0.109	0.120
	Working Pressure (Psig)
1/8	7900	10100
1/4	3700	4800	7000	9500
5/16		3700	5400	7300
3/8		3100	4400	6100
1/2		2300	3200	4400
3/4			2200	3000	4000	4600
1				2200	2900	3400	3900	4300

ASTM A790 UNS S31803 Heat Treatment

UNS Designation	Type	Temperature °F [°C]	Quench
S31803	-	1870-2010℉(1020-1100℃)	Rapid cooling in air or water
S32205	2205	1870-2010℉(1020-1100℃)	Rapid cooling in air or water
S32750	2507	1880-2060℉(1025-1125℃)	Rapid cooling in air or water
S32760	-	2010-2085℉(1100-1140℃)	Rapid cooling in air or water

UNS S31803 Pipe Types:

Seamless Pipe is made by piercing holes through a solid metal blank and then stretching it through a series of rollers to form the final shape.
Duplex 2205 Welded Pipe is made by rolling flat metal into a tube and then welding the edges together to form a continuous seam.

ASTM A790 Standard:

ASTM A790 is the standard specification for seamless and welded ferritic/austenitic stainless steel pipe, covering multiple grades of duplex and super duplex stainless steels, including S31803, S32205, S32750, and S32760.