Duplex Steel S31803 Flanges Manufacturer In India | Astm A182 F51 & Asme B16.5 Flanges

Riddhi Siddhi Metal Impex is a leading Duplex Steel S31803 Flanges Manufacturer that provides high quality flanges to offshore platforms, petrochemical, marine, oil and gas pipelines, and industrial processing systems. These flanges are made using the ASTM A182 F51 / UNS S31803 material offering an excellent blend of high mechanical strength, excellent corrosion resistance, and excellent stress corrosion cracking resistance. Their duplex microstructure provides superior durability and life cycle in hostile environments, thus they can be used in the critical industrial processes where reliability and performance are paramount.

Duplex Steel S31803 Flanges can be sourced by industrial procurement teams via a reputable B2B Platform with customizable dimensions, pressure classes, and flange configuration. These flanges are manufactured to international standards on quality and are highly tested to maintain uniform performance. They are highly resistant to pitting and crevice corrosion and, as such, find common application in seawater systems, chemical processing plants, and in high-pressure applications where the integrity of the material matters.

Material & Weight Chart of Duplex Steel S31803 Flanges

Duplex Steel S31803 Flanges are produced as per ASTM and ASME standards and are offered in different sizes to be used in industries. A list of typical specifications and weights is given in the chart below.

Material Grade	Nominal Size (NB)	Pressure Class	Flange Type	Standard	Approx. Weight (kg)
ASTM A182 F51	1/2"	150#	Slip On	ASME B16.5	0.82
ASTM A182 F51	1"	300#	Weld Neck	ASME B16.5	2.25
ASTM A182 F51	2"	300#	Slip On	ASME B16.5	4.95
ASTM A182 F51	4"	600#	Weld Neck	ASME B16.5	15.60
ASTM A182 F51	6"	600#	Blind	ASME B16.5	29.80
ASTM A182 F51	8"	900#	Weld Neck	ASME B16.5	52.40

Duplex Steel S31803 Flanges are widely used in industries where high resistance to corrosion, high strength and reliability to perform under extreme operating conditions are required. They are the best to use in offshore constructions, desalination plants, chemical plants, and marine engineering projects due to their higher resistance to corrosion by chlorides. In the transportation systems, structural frameworks, marine installations, and industrial fabrication projects where weight is a critical factor and durability is also of concern, the Aluminium 6082 Flange can also be utilized in applications where lightweight construction, high machinable performance and cost efficiency are needed.