Manufacturer, Supplier & Exporter of Duplex Steel Threaded Union

Duplex Steel Threaded Union is a high-performance piping fitting designed to join two pipes securely while offering excellent corrosion resistance and mechanical strength. Manufactured by Riddhi Siddhi Impex, this union is widely recognized for its durability and reliability in critical industrial applications such as oil & gas, petrochemical, chemical, and marine industries. It is engineered to handle high-pressure and high-temperature systems efficiently...

The threaded design of the Duplex Steel Union ensures easy installation and removal, making it a preferred choice for maintenance-intensive systems. Its duplex stainless steel composition provides a perfect balance between austenitic and ferritic properties, offering superior resistance to stress corrosion cracking and chloride-induced corrosion, which is crucial for aggressive environments..

Riddhi Siddhi Impex offers a wide range of Duplex Steel Threaded Unions in various sizes and pressure ratings. The company ensures that each union complies with international standards such as ASTM A182, ASME B16.11, and ISO 9001, maintaining high-quality manufacturing practices. These unions are available in standard finishes, including pickled, passivated, or polished, depending on the client’s requirements..

As a leading domestic supplier, Riddhi Siddhi Impex caters to major cities across India including Mumbai, Delhi, Bengaluru (Bangalore), Hyderabad, Chennai, Kolkata, Pune, Ahmedabad, Surat, Vadodara, Rajkot, Nagpur, Indore, Bhopal, Jaipur, Kanpur, Lucknow, Agra, Varanasi, Amritsar, Chandigarh, Mysuru (Mysore), Udaipur, Jodhpur, Visakhapatnam, Coimbatore, Madurai, Kochi, Thiruvananthapuram, Mangalore, Nashik, Kolhapur, Chandrapur, Akola, Vilayat, Somnath, Dahej, Narmada, Ankleshwar, Navsari, Valsad, and Rajpipla. The extensive distribution network ensures prompt delivery and excellent after-sales support...

These unions are widely used in chemical processing plants, desalination plants, power plants, and marine engineering, where reliability under challenging conditions is essential. Duplex steel’s high tensile strength and toughness ensure that threaded unions can withstand high pressure and mechanical stress without deformation or leakage..

Duplex Steel Threaded Union

Specification

Material	Duplex Stainless Steel
Grade	UNS S32205 / S31803
Standard	ASTM A182 / ASME B16.11
Size Range	1/2" to 12"
Pressure Rating	Class 150, 300, 600
Finish	Pickled & Passivated / Polished
Thread Type	BSP / NPT / Custom

Chemical Composition

Element	Content (%)
Chromium (Cr)	21 – 23
Nickel (Ni)	4.5 – 6.5
Molybdenum (Mo)	2.5 – 3.5
Manganese (Mn)	1.0 – 2.0
Carbon (C)	≤ 0.03
Nitrogen (N)	0.14 – 0.20
Iron (Fe)	Balance

Mechanical Properties

Property	Value
Tensile Strength	≥ 620 MPa
Yield Strength (0.2% offset)	≥ 450 MPa
Elongation	≥ 25%
Hardness	≤ 35 HRC

Dimension Chart

Size (inches)	Length (mm)	Thread Type
1/2"	40	BSP / NPT
3/4"	50	BSP / NPT
1"	60	BSP / NPT
2"	90	BSP / NPT
4"	150	BSP / NPT

Equivalent Grades

Standard	Grade
ASTM	S32205 / S31803
EN	1.4462
JIS	SUS329J4L
DIN	1.4462

Equivalent Standards

Standard	Description
ASTM A182	Forged or Rolled Alloy and Stainless Steel Pipe Flanges, Forged Fittings, and Valves
ASME B16.11	Forged Fittings, Socket-Welding and Threaded

Other Types of Duplex Steel Pipe Fittings

Type	Description
Socket Weld Union	Provides secure socket-welded pipe connections
Threaded Coupling	Joins pipes using threaded ends for easy maintenance
Threaded Elbow	Connects pipes at 45° / 90° angles
Threaded Tee	Allows three-pipe junctions with threaded ends

In addition to standard threaded unions, Riddhi Siddhi Impex supplies custom-designed Duplex Steel Threaded Unions to meet specific project requirements. Their product range includes sizes from 1/2 inch to 12 inches, with tailored lengths and threading to suit specific piping configurations. This flexibility makes them a trusted supplier for engineering and construction projects across India.

Frequently Asked Questions (FAQs)

Q1: What pressure classes are available for Duplex Steel Threaded Unions?

A1: Duplex Steel Threaded Unions are available in Class 150, 300, and 600, suitable for various industrial applications.

Q2: Which thread types are supported?

A2: These unions support BSP, NPT, and custom thread options depending on project requirements.

Q3: What are the typical applications of Duplex Steel Threaded Unions?

A3: They are commonly used in oil & gas, chemical processing, power plants, marine, and water treatment industries.

Q4: Which Indian cities are served by Riddhi Siddhi Impex?

A4: Riddhi Siddhi Impex supplies Duplex Steel Threaded Unions across Mumbai, Delhi, Bengaluru, Hyderabad, Chennai, Kolkata, Pune, Ahmedabad, Surat, Vadodara, Rajkot, Nagpur, Indore, Bhopal, Jaipur, Kanpur, Lucknow, Agra, Varanasi, Amritsar, Chandigarh, Mysuru, Udaipur, Jodhpur, Visakhapatnam, Coimbatore, Madurai, Kochi, Thiruvananthapuram, Mangalore, Nashik, Kolhapur, Chandrapur, Akola, Vilayat, Somnath, Dahej, Narmada, Ankleshwar, Navsari, Valsad, and Rajpipla.