Calico Metal Alloys LLP is a trusted supplier of high-quality Duplex Steel UNS S31803 Fittings in India. With a commitment to excellence and reliability, we deliver superior-grade fittings known for their exceptional strength, corrosion resistance, and durability. As a leading supplier, we cater to diverse industrial requirements, offering a comprehensive range of Duplex Steel UNS S31803 Fittings that meet stringent quality standards. Backed by extensive expertise and a robust distribution network, we ensure timely delivery and customer satisfaction, making us the preferred choice for discerning clients seeking top-notch duplex steel fittings in India.

What Are Duplex Steel UNS S31803 Fittings?

Duplex Steel UNS S31803 fittings are components made from duplex stainless steel known for its superior strength and corrosion resistance, offering both ferritic and austenitic microstructures for exceptional resistance against pitting and crevice corrosion. As these fittings possess such outstanding mechanical properties and durability they're widely utilized across industries including chemical processing, oil & gas extraction as well as marine use.

Duplex Steel UNS S31803 Fittings

Manufacturing Process Of Duplex S31803 Fittings


Using a forging machine to lower the outside diameter and bevel the pipe end or extension is one method of making forged fittings.

Rolling Wheel

The core is inserted into the pipe using butt weld fittings. After that, processing the rim and pushing the exterior with a roller.


Expand the pipe end in the punching machine to the desired size and shape by using a tapered core.


for creating bend and elbow fits. There are three typical approaches. There are three or four rollers: one is for stretching, one for stamping, and the third is for rolling.


A rubber is inserted into the tube and compressed with a punch, causing the pipe to bulge; hydraulic bulging forming is an additional technique.

Advantages of Duplex Steel UNS S31803 Fittings

Duplex steel UNS S31803 fittings have many benefits due to their composition and properties; here are just a few:

Corrosion Resistance: Duplex steel UNS S31803 fittings possess superior corrosion resistance in harsh environments like marine or chemical processing industries, including stress corrosion cracking and pitting resistance. Additionally, their general corrosion protection extends well past localized corrosion issues as well as general generalization resistance.

Strength: These fittings feature outstanding strength, withstanding heavy loads and pressure without deformation or collapse - ideal for applications where structural integrity is essential.

Duplex Structure: UNS S31803 steel's duplex structure offers the advantage of both austenitic and ferritic microstructures for enhanced strength and toughness compared to standard austenitic or ferritic stainless steels.

High Temperature Resistance: Duplex steel UNS S31803 fittings have exceptional resistance to high temperatures, making them suitable for applications where exposure to such environments may occur regularly.

Cost-Effectiveness: Duplex steel UNS S31803 fittings can offer superior properties at more cost-effective pricing compared to some corrosion-resistant alloys, providing a balance between performance and affordability.

Ease of Fabrication: These fittings are relatively straightforward to design, weld and form for efficient manufacturing processes as well as customization to meet specific project needs.

Versatility: Duplex steel UNS S31803 fittings can be utilized across several industries, from oil and gas production, chemical processing, pulp & paper mills and marine engineering.

Overall, UNS S31803 duplex steel fittings provide the optimal combination of corrosion resistance, strength and cost-efficiency to make them an outstanding option for use in challenging environments.

Specifications and Sizes of Duplex Steel UNS S31803 Fittings

Duplex Steel UNS S31803 fittings can typically be found ranging in diameters of 1/2" up to 24". They feature various specifications. They're designed to withstand high pressures and hostile environments, making them suitable for applications in industries like oil & gas, chemical processing and marine engineering. These fittings, typically manufactured to ASTM A815 standards and known for their superior mechanical properties - including strength and weldability. Common types include elbows, tees, reducers, caps and others that meet diverse pipe piping needs. Furthermore, Duplex Steel UNS S31803 fittings typically adhere to specific pressure ratings to guarantee reliability and safety under extreme operating environments.

Specifications ASTM A815 / ASME SA815, ASTM A182 & ASME SA182
Forged Fittings Standards ASME 16.11, MSS SP-79, 83, 95, 97, BS 3799
Buttweld Fittings Dimensions ASME/ANSI B16.9, ASME B16.28, MSS-SP-43
Buttweld Fittings Size 1/2” NB to 24″NB in. (Seamless & 100% X-Ray Welded, Fabricated)
Forged Fittings Size 1/8” NB to 4” NB (Socketweld & Screwed-Threaded)
Buttweld Fittings Type Seamless / Welded / Fabricated
Forged Fittings Type Socketweld Fittings, Screwed-Threaded Fittings
Forged Fittings Class 2000 LBS, 3000 LBS, 6000 LBS, 9000 LBS
Buttweld Fittings Bending Radius R=1D, 2D, 3D, 5D, 6D, 8D, 10D or Custom
Buttweld Fittings Thickness Sch 5s, Sch 10s, Sch 40s, Sch 80s, Sch 160s, Sch XXS

Types Of Duplex Stainless Steel S31803 Fittings


Duplex Steel S31803 Elbow


Duplex Steel S31803 Tee


Duplex Steel S31803 Reducer


Duplex Steel S31803 Coupling


Duplex Steel S31803 Pipe Cap


Duplex Steel S31803 Union


Other Types Of Duplex Steel S31803 Fittings

DSS S31803 Buttweld Elbow Duplex Steel S31803 Stub End
DSS S31803 Fittings Duplex Steel S31803 Socket weld Fittings
Duplex Steel S31803 Pipe Fittings Duplex Steel S31803 Industrial Fittings
S31803 Duplex Steel Forged Fittings Duplex Steel S31803 Threaded Fittings
S31803 Duplex Stainless Steel 90 Degree Elbow UNS S31803 Buttweld Pipe Fittings
F51 Duplex Stainless Steel Seamless Fittings Duplex Stainless Steel F51 Welded Fittings
Duplex S31803 Half Couplings Duplex S31803 Concentric Reducer
ASME SA182 Duplex Steel S31803 Forged Fittings ASTM A815 Duplex Steel S31803 Butt weld Fittings
Duplex Stainless Steel S31803 Pipe Bend Duplex Steel S31803 Bushing
Duplex Steel S31803 High Pressure Forged Fittings S31803 Duplex Steel Threaded Plugs
ANSI B16.11 Duplex Steel S31803 Forged Fittings ANSI B16.9 Duplex Steel S31803 Pipe Fittings

UNS S31803 Fittings Equivalent Grade

S31803 1.4462 S31803 4462-318-03-I

Chemical Composition of Duplex Steel S31803 Fittings

UNS Designation Type Composition, % B
C Mn P S Si Cr Ni N Mo Other Elements C
S31803 . . . 0.030 2.00 0.030 0.020 1.00 21.0-23.0 4.5-6.5 0.08-0.20 2.5-3.5 . . .

Mechanical Properties of Duplex Steel S31803 Fittings

UNS Designation Type Condition Tensile Strength, min, ksi [MPa] Yield Strength,A min, ksi [MPa] Elongation in 2 in. [50 mm] or 4D, min, % Reduction of Area, min, %B,C Brinell Hardness, max
S31803 . . . annealed 90 [620] 65 [450] 25 . . . 290

Applications of Duplex Steel UNS S31803 Fittings

Duplex steel UNS S31803, also known as Duplex 2205, is a type of stainless steel with a dual microstructure consisting of approximately equal parts of austenite and ferrite phases. This unique combination of properties makes it suitable for a wide range of applications, including fittings. Some common applications of Duplex steel UNS S31803 fittings include:

Oil and Gas Industry: Duplex steel fittings have become ubiquitous within the oil and gas industry due to their versatility of application in pipelines, offshore platforms, subsea equipment and refineries. They boast exceptional strength, corrosion resistance and stress corrosion cracking resistance qualities which makes them suitable for these rigorous environments.

Chemical Processing: Duplex steel fittings are used in chemical processing plants where resistance to corrosion from harsh chemicals is crucial. They are employed in piping systems, reactors, heat exchangers, and other equipment where corrosion resistance and mechanical strength are essential.

Desalination Plants: Duplex steel fittings have become an ideal choice in desalination plants that convert seawater to fresh water due to their resistance against chlorine-induced stress corrosion cracking and pitting corrosion in marine environments.

Marine Applications: Duplex steel fittings have many applications within the marine industry, including shipbuilding, offshore structures and pipelines. Due to their corrosion-resistance, high strength, and durability properties they make them well suited for withstanding harsh marine environments.

Pulp and Paper Industry: Duplex steel fittings can be found throughout the pulp and paper industry, such as digesters and bleach plants that require chemical resistance as well as temperature resistance.

Water Treatment: Duplex steel fittings are widely utilized at water treatment plants to protect piping systems against corrosion and erosion caused by various chemicals present in both wastewater and drinking water sources. They offer protection from such hazards.

Overall, Duplex steel UNS S31803 fittings are versatile products used in various industries for applications that demand corrosion resistance, mechanical strength and long term performance.

Electrical Industry


Automotive Industry


Construction Industry


Defence Industry


Pharmaceutical Industry


Petroleum Industry


Petrochemical Industry


Milk & Dairy Industry

Milk & Dairy

Export & Supply Destinations Of Duplex S31803 Fittings

Austria, Finland, Spain, Germany, Sweden, Russia, Portugal, Turkey, Greece, Belgium, Hungary, Estonia, France, United Kingdom, Poland, Denmark, Italy, Netherlands, Ireland, Latvia, Croatia, Switzerland, Lithuania, Serbia, Azerbaijan, Bulgaria, Czechia/Czech Republic, Monaco, Slovakia, Malta, Liechtenstein, Norway, Luxembourg, Ukraine, Romania, Moldova, Belarus, Cyprus.

Kyrgyzstan, Oman, Maldives, Jordan, Bahrain, Singapore, Sri Lanka, Myanmar, British, Thailand, Vietnam, Iran, Turkey, Philippines, South Korea, Macau, United Arab Emirates, Afghanistan, Saudi Arabia, Israel, North Korea, Iraq, Bhutan, Kuwait, Hong Kong, Mongolia, Qatar, Armenia, Azerbaijan, Lebanon, India, China, Taiwan, Russia, Japan, Nepal, Bangladesh, Egypt, Indonesia, Malaysia.

Algeria, Tunisia, Senegal, Mozambique, Niger, Burundi, Nigeria, Zambia, Liberia, Angola, Rwanda, Libya, Madagascar, Namibia, Uganda, Mauritius, Morocco, Gambia, Egypt, South Africa, Eswatini, Ethiopia, Botswana, Seychelles, Kenya, Cameroon, Central African Republic, Mauritania, Burkina Faso, Tanzania, Zimbabwe.

United States of America, Dominican Republic, Belize, Panama, Guatemala, Bahamas, Cuba, Trinidad and Tobago, Canada, Saint Vincent and the Grenadines, Dominica, Mexico, Jamaica, Nicaragua, Haiti, Costa Rica, El Salvador, Grenada, Antigua and Barbuda, Barbados, Honduras, Saint Lucia.

Colombia, Ecuador, Brazil, Venezuela, Guyana, Uruguay, Argentina, Paraguay, Chile, Peru, Bolivia, Suriname.