Duplex Steel S31803 Flanges

Duplex Steel S31803 Flanges are made from a duplex stainless steel alloy that combines high strength with remarkable corrosion resistance. The alloy contains around 22% chromium, 4.5–6.5% nickel, and 3–3.5% molybdenum, along with nitrogen, which improves toughness and resistance to stress corrosion cracking. These S31803 flanges perform well in both low and high temperatures, ranging from -50°F to 1200°F. Available in slip-on, weld neck, and blind types, they connect pipes, valves, and pumps in critical systems. Metracore Alloys, one of most trusted duplex steel S31803 flanges manufacturers, delivers reliable products with strong mechanical properties, including a tensile strength of 800 MPa and yield strength of 550 MPa.

Duplex Steel S31803 Flanges, S31803 Flanges, ASTM A182 F51 Flange

Produced as per ASTM A182 F51 flange standards, these flanges are available in sizes from 1/8″ NB to 24″ NB. Their prominent feature is their excellent corrosion resistance in chloride-rich environments, which protects against pitting and crevice corrosion. S31803 F51 flanges offer nearly twice the yield strength of regular stainless steel due to their dual-phase structure of ferrite and austenite. Additionally, they provide good weldability, stability at high temperatures, and resistance to stress corrosion cracking. They are a popular option in many industries because of their strength, resilience, and durability.

Duplex UNS S31803 flanges serve a wide range of applications. They are used in chemical processing plants, oil and gas systems, pulp and paper industries, marine projects, and water treatment facilities. These flanges are also used in the manufacturing of food and drink, bridges and other infrastructure projects where durability and resistance to corrosion are essential. To meet dimensional and mechanical standards, the manufacturing process entails melting and refining steel, forging or cutting, heat treatment using solution annealing and quenching, precision machining, and stringent quality testing.

S31803 F51, Duplex UNS S31803 Flanges Suppliers, Duplex Steel S31803 Flanges Manufacturers

Each of our flange is supplied with a Material Test Certificate (MTC) conforming to EN 10204/3.1 or 3.1B. They meet global material standards like ASTM A182 and dimensional standards such as ASME B16.5 and EN 1092. To ensure safe delivery we pack our duplex steel S31803 flanges in wooden crates, steel pallets, or wrapped with bubble and shrink film to prevent damage during transport. Customers receive dependable quality and secure packaging, ready for direct installation.

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Table of Content

Duplex Steel S31803 Flanges Specification

Types of Duplex Steel S31803 Flanges

Duplex Steel S31803 Flanges Face Forms

Reach out to Metracore Alloys for reliable Duplex Steel S31803 Flanges solutions

Technical Details of Duplex Steel S31803 Flanges

Equivalent Grades of Duplex Steel S31803

STANDARD	UNS	WERKSTOFF NR.
Duplex S31803	S31803	1.4462

Duplex Steel S31803 Chemical Composition

Grade	C	Mn	Si	P	S	Cr	Mo	Ni	N	Fe
S31803	0.030 max	2.00 max	1.00 max	0.030 max	0.020 max	22.0 – 23.0	3.0 – 3.5	4.50 – 6.50	0.14 – 0.20	63.72 min

Duplex Steel S31803 Mechanical Properties

Grade	Density	Melting Point	Tensile Strength	Yield Strength (0.2%Offset)	Elongation
S31803	7.8 g/cm3	1350 °C (2460 °F)	Psi – 116000 , MPa – 800	Psi – 80000 , MPa – 550	15 %

Duplex Steel S31803 Flange Pressure Ratings

ASME/ANSI B 16.5	Slip on Flange, Welding Neck Flange, High Hub Blind Flange, Blind Flange, Lap Joint Flange, Socket Weld Flange, Ring Type Joint Flange, Threaded Flange
PRESSURE CLASS	150, 300, 400, 600, 900, 1500, 2500
ASME/ANSI B 16.47	Blind Flange [Series A & B], Welding Neck Flange
PRESSURE CLASS	75, 150, 300, 400, 600, 900
ASME/ANSI B 16.36	Slip on Flange, Welding Neck Flange, Threaded Flange
PRESSURE CLASS	300, 400, 600, 900, 1500, 2500
BS 4504 SEC 3.1	Hubbed Slip on Flange, Welding Neck Flange, Lapped Pipe End Flange, Hubbed Threaded Flange, Loose Plate Flange, Plate Flange, Blank Flange, Loose Plate With Weld Neck Flange
PRESSURE CLASS	PN 2.5 TO PN 40
BS 4504[PART 1]	Welding Neck Flange, Plate Flange, Hubbed Slip-On Hubbed Threaded, Blank Flange, Loose Plate With Weld On Plate Collar
PRESSURE CLASS	PN 2.5 TO PN 400
BS 1560 BOSS	Socket Welding Flange, Welding Neck Flange, Blind Flange, Slip-On Flange, Lapped Flange, Screwed Boss Flange
PRESSURE CLASS	150, 300, 400, 600, 900, 1500, 2500
BS10	Plate Slip-On Flange, Welding Neck Flange, Slip-On Boss Flange, Screwed Boss Flange, Blind Flange
TABLE	D, E, F, H
DIN FLANGES	DIN 2527, 2566, 2573, 2576, 2641, 2642, 2655, 2656, 2627, 2628, 2629, 2631, 2632, 2633, 2634, 2635, 2636, 2637, 2638, 2673
PRESSURE CLASS	PN 6 TO PN 100

ASTM A182 Duplex Steel S31803 Flanges Weight Chart

Standard	Class	Diameter	Bolt Circle Diameter	Number of Bolts	Bolt Size	Diameter of Bolt Hole
AS4087 Flanges	PN14 Flanges	95	67	4	M12	14
AS 2129 Flanges	Table C Flanges	95	67	4	13	14
	Table D Flanges	95	67	4	13	14
	Table E Flanges	95	67	4	13	14
	Table F Flanges	95	67	4	13	14
	Table H Flanges	114	83	4	16	17
	Table J Flanges	114	83	4	16	17
ANSI B16.5 Flanges	ANSI 150 Flanges	89	60	4	13	16
	ANSI 300 Flanges	95	67	4	13	16
	ANSI 600 Flanges	95	67	4	13	16
	ANSI 900 Flanges	121	83	4	19	22
	ANSI 1500 Flanges	121	83	4	19	22
ISO 7005 (DIN) Flanges	PN6 Flanges	80	55	4	M10	11
	PN10 Flanges	95	65	4	M12	14
	PN16 Flanges	95	65	4	M12	14
	PN20 Flanges	90	60.5	4	M14	16
	PN25 Flanges	95	65	4	M12	14
	PN40 Flanges	95	65	4	M12	14

Manufacturing Process of Duplex Steel S31803 Flanges

Duplex Steel S31803 Flanges Application

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