Duplex Steel S31803 Flanges Manufacturer in Cape Town , South Africa

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Duplex Steel S31803 flanges are top-notch piping components crafted from a unique dual-phase stainless steel that blends austenitic and ferritic structures. They boast impressive mechanical strength, exceptional corrosion resistance, and remarkable durability, making them perfect for tough industrial settings. These flanges are designed to withstand pitting, crevice corrosion, and stress corrosion cracking, particularly in environments rich in chlorides, acidic conditions, and high temperatures. You’ll find them widely utilized in industries like chemical processing, oil and gas, petrochemicals, marine, and power generation.

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Typically, the makeup of Duplex Steel S31803 flanges includes 22–25% chromium, 4–7% nickel, 2–4% molybdenum, along with nitrogen additions that boost their corrosion resistance and strength. They deliver a tensile strength of about 620–850 MPa and a yield strength of around 450–550 MPa, all while maintaining excellent toughness and ductility. The well-balanced duplex microstructure helps them resist intergranular corrosion, thermal stress, and fatigue, ensuring reliable performance even in high-pressure and high-temperature situations.

Duplex Steel S31803 Flanges Specifications

Specifications	ASTM A182 / ASME SA182
Size	1/8″ NB TO 48″ NB
Standards	ANSI/ASME B16.5, B 16.47 Series A & B, B16.48, BS4504, BS 10, EN-1092, DIN, etc.
Class / Pressure	150#, 300#, 600#, 900#, 1500#, 2500#, PN6, PN10, PN16, PN25, PN40, PN64 etc.
Standard	ANSI Flanges, ASME Flanges, BS Flanges, DIN Flanges, EN Flanges, etc.
Grades	S31803 / S32205 A182 Gr F51 / F52 / F53 / F54 / F55 / F57 / F59 / F60 / F61

Duplex Steel S31803 Flanges 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 Flanges Mechanical Properties

Grades	Density (g/cm 3)	Density (lb/in 3)	Melting Point (°C)	Melting Point (°F)
S31803	7.805	0.285	1420 – 1465	2588 – 2669

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Largest Manufacturer and Supplier of Duplex Steel S31803 Flanges in Cape Town , South Africa

At Themban Nickel Alloys, we take pride in being the largest supplier, exporter, and manufacturer of Duplex Steel S31803 Flanges in Cape Town , South Africa, providing cutting-edge solutions for all your piping needs. Our state-of-the-art production plants are strategically located in the Cape Town, allowing us to maintain a vast inventory of over 16,000 tons of premium-quality materials readily available in stock. We are dedicated to delivering superior products and services, ensuring reliability and excellence for our global clientele.

Types of Duplex Steel S31803 Flanges

We offer These Products as per DIN, ISO, JIS or ANSI Standard.

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Duplex Steel S31803 Flanges Uses

You’ll often see Duplex Steel S31803 flanges in pipelines, pressure vessels, heat exchangers, desalination plants, and offshore installations. Their blend of high strength, corrosion resistance, and durability guarantees secure connections, a long service life, and less maintenance in harsh industrial environments. These flanges are particularly well-suited for applications involving seawater, acids, and other corrosive substances.

Duplex Steel S31803 Flanges Manufacturer in Cape Town , South Africa

Table of Contents

Duplex Steel S31803 Flanges Specifications

Duplex Steel S31803 Flanges Chemical Composition