Duplex Stainless Steel

Ambica Steels is the largest producer of Duplex Stainless Steel Long Products in India. Ambica Steels produces these materials for a wide variety of applications and industrial sectors. These user segments are the benchmark for quality. Every part is continually and stringently checked for quality and certified. Ambica’s steels are melted, cast and formed with the perfection and care.

Due to its two-phase microstructure, Duplex steels are extremely tough to produce. It took Ambica Steels many years of constant trials & errors, before gaining a complete control over this steel. The dual phase structure demands a perfect balance in the chemistry of these steels. Duplex steels also show an irregular behavior when undergoing various hot working processes. But thanks to the strong determination of our Research & Development team, as Ambica Steels now enjoys the reputation of being one of the most reliable suppliers of Duplex materials in domestic as well as the international market.


Duplex Stainless Steel Long Products are the family of steels that have a mixed micro-structure of 50% ferrite and 50% austenite. They are known to offer exceptional strength and astounding aesthetic qualities along with better resistance to corrosion and high temperature, superior hygienic surface finishing, and improved steel recyclability.

At Ambica Steels, we are committed to ensuring the development of highly sustainable long products that meet the expectations and requirements of our clients. As a result of our drive to continuously improve and transform our products, we manufacture customized duplex stainless products in our ultra-modern production facilities in multiple grades and sizes. By leveraging the expertise of the team of experts, we develop a wide range of corrosion-resistant duplex stainless steel products that maintain a uniform size and surface tolerance in diverse environments.

Pitting Resistance Equivalent Number (PREN)

Steel Grade Pitting Resistance Equivalent Number (PREN)
1.4307 18
1.4404 24
1.4362 25
S31803 31
S32205 35

Mechanical Properties

Grade No. Yield Strength(Rp 0.2%)(Min) UTS (Mpa) (Min) UTS (Mpa) (Max) % Elongation (Min) % Reduction Area (Min) Hardness (BHN) (Max)
1.4462 >=450 >=650 >=880 >=15 >= >=270
UNS S31803 >=450 >=620 >= >=25 >= >=290
UNS S32205 >=450 >=655 >= >=25 >= >=290

Chemical Composition

Standard Grade C% Si% Mn% P% S% Cr% Mo% Ni(Max) Cu% N2(Max)
ASTM A 182:2016 F-51 0.03 1 2 0.03 0.02 21-23 2.5-35 4.5-6.5 0.08-0.20
ASTM A 182:2013 F-60 0.03 1 2 0.03 0.02 22-23 3.0-3.5 4.5-6.5 0.14-0.20
ASTM A 182: 2013 F-53 0.03 0.8 1.2 0.035 0.02 24-26 3-5 6.0-8.0 0.5 0.24-0.32
ASTM A 276:2013 UNS S32205 0.03 1 2 0.03 0.02 22-23 3.0-3.5 4.5-6.5 0.14-0.2
ASTM A 276:2013 UNS S31803 0.03 1 2 0.03 0.02 21-23 2.5-3.5 4.5-6.5 0.08-0.20
ASTM A240:2005 UNS S32750 0.03 0.8 1.2 0.035 0.02 24-26 3-5 6.0-8.0 0.5 0.24-0.32
DIN EN 10088-3:2005 1.44.62 0.03 1 2 0.035 0.015 21-23 2.5-3.5 4.5-6.5 0.1-0.22
DIN EN 10088-3:2005 1.4460 0.05 1 2 0.035 0.03 25-28 1.3-2.0 4.5-6.5 0.05-0.2
EN 10095 :1999 1.4821 01-0.2 08-15 2 0.04 0.015 24.5-26.5 3.5-5.5 0.11
DIN EN 10088-3:2005 1.4410 0.03 1 2 0.035 0.015 24-26 3.0-4.5 6.0-8.0 0.24-0.35

Being one of the prominent and largest producers of premium quality Duplex Stainless Steel Long products in India and abroad, Ambica Steels manufactures materials that are widely used in an array of applications as well as industrial sectors. Our stainless products are a benchmark of superior quality amongst numerous user segments. Our experts continually check and validate each and every step of production – right from melting and casting to product formation –to ensure perfection and care.

Since Duplex Stainless Steel has a two-phase microstructure, the production of these products requires precision and meticulousness of experts. Its dual-phase structure requires a perfect balance in the chemistry of these steels. Besides, duplex stainless steel also exhibits an irregular pattern and behavior while undergoing several hot working processes (especially hot working processes).

It took the adept and knowledgeable team at Ambica Steels many years of perpetual trials and errors to gain a thorough control over this stainless steel product. Thanks to the fierce determination of our passionate Research & Development (R&D) team, Ambica Steels currently enjoys the repute of a most reliable manufacturer and supplier of the Duplex Stainless Steel products in both domestic and international market.

Ambica Steels employs advanced technology to manufacture high volume and high performance duplex stainless steel products. The series of processes performed in the production of stainless steel is carried out at our avant-garde manufacturing facilities that are sited in and around the New Delhi area (India). All our production facilities are loaded with sophisticated and modern equipment, including

  • Electro Magnetic Stirrer
  • Centerless Grinding/ Bar Peeling/ Polishing machines
  • Ladle Refining Furnace
  • Bar-to-Bar & Coil-to-Coil Drawing Machines
  • Heat Treatment Furnaces
  • Bar Hot Rolling Mill with 4 stands (460 mm) and 6 stands (330 mm)
  • Inspection & Finishing lines
  • Ingot Casting
  • Bloom/Billet Continuous Casting Machine, 2 stands, 9/16 meter radius
  • Electric Melting Furnaces
  • Argon Oxygen Decarburization (A.O.D) Converter
  • Schumag Combined Polishing & Drawing machines
  • Modern mechanical chemical & laboratory

Since our expert team is dedicated to achieving on-time delivery and 100% customer satisfaction, we work in flexible time shifts to operate in tandem with our clients and achieve production specifications corresponding to the customer requirements.

At Ambica Steels, we pride ourselves as a client centric organization. Our more than 40 years of bond with our customers successfully vouch for the dedication and hard work our employees have made to nurture this relationship. We believe in strictly adhering to the industry guidelines and consistently deliver products of finest quality by performing regular inspection and monitoring at each step of duplex stainless steel production. We exhibit zero tolerance for any internal defects!

At Ambica Steels, we produce high grade Duplex Stainless Steel products that undergo continuous checks and inspections at each production step in order to meet the unique specifications and requirements preferred by our esteemed clients. Our products are used in a number of industries, such as:

  • Pulp & Paper industry
  • Flue-gas cleanings
  • Desalination plants
  • Seawater systems
  • Cargo tanks & pipe systems that are used in the chemical tankers
  • Bridges
  • Firewalls & blast walls on the offshore platforms
  • Structural Design Components
  • Storage Tanks
  • Heat exchangers
  • Pressure vessels
  • Rotors/ Impellers/ Shafts
  • Water heaters
  • Reinforcing bars that are used for making concrete structures

Grade Description
  303  303 grade represents the optimum in machining among the austenitic stainless steels. It is primarily used when production involves extensive machining. 303 is available in Improved Machining grade with machining characteristics significantly higher than that of the standard 303.
  304  304 grade is dual certified as grade 304 and 304L. Grade 304 is the standard “18/8” stainless. It has excellent forming and welding characteristics. Grade 304L, the low carbon version of 304, does not require post-weld annealing and so is extensively used in heavy gauge components. 304 is available in Improved Machining grade with machinability significantly higher than that of the standard 304.
  316  316 grade is dual certified as grade 316 and 316L. 316 is the standard molybdenum-bearing stainless steel, second in importance to 304 amongst the austenitic stainless steels. The molybdenum gives 316 better overall corrosion resistant properties than Grade 304, particularly higher resistance to pitting and crevice corrosion in chloride environments. It has excellent forming and welding characteristics. 316 is available in Improved Machining grade with machinability significantly higher than that of the standard 316.
  420  420 grade can be hardened by quench-and-temper heat treatment. It contains a minimum of 12 per cent chromium, just sufficient to give corrosion resistance properties. It has good ductility in the annealed condition but is capable of being hardened up to Rockwell Hardness 50HRC, the highest hardness of the 12 per cent chromium grades. Its best corrosion resistance is achieved when the metal is hardened and surface ground or polished. 420 is available in Improved Machining grade with machinability significantly higher than that of the standard 420.
  431  431 grade is a heat treatable martensitic, nickel-bearing grade has the best corrosion resistance properties of all the martensitic grades. It has excellent tensile and torque strength, and good toughness, making it ideally suited to shafting and bolt applications. It can be hardened to approximately 40HRC. Because of its high yield strength, this grade is not readily cold worked and is therefore not recommended for use in operations such as cold heading, bending, deep drawing or spinning. 431 is available as in Improved Machining grade with machinability significantly higher than that of the standard 431.
  2205  2205 grade is the most widely used duplex (ferritic/austenitic) stainless steel grade. It finds applications due to both excellent corrosion resistance and high strength.

Our duplex stainless steel products are principally characterized by the following key features:

  • 100% pure and premium stainless steel
  • Stress and Corrosion Resistant Alloys (Austenitic and Ferritic)
  • Extremely high mechanical strength
  • Excellent weldability
  • Superior Reliability
  • Low thermal expansion
  • Manufacturing process carried out in state-of-the-art facility
  • High tolerance to match exact client requirements
  • Ultra-inspection guidelines followed to attain extraordinary accuracy
  • Improved tensile strength
  • Melting/ Heating/ Reshaping of steel is carried out in a controlled environment
  • ISO certified organization

Since1970, the establishment of our progressive organization by Mr. CP Gupta was instituted with the objective of working in association with our clients and partners. Today, Ambica Steels is a representation of long lasting relationships developed with our prestigious clients by creating indispensable solutions for their most critical problems in clean energy, infrastructure, clean water, etc.

Being a leading producer and exporter of superior grade Duplex Stainless Steel Long Products in India and abroad, we supply top-quality steel products at economic and competitive prices. At our modern facilities, we create excellent corrosion and heat resistant products that are used in a range of applications. All our facilities are well-equipped with sophisticated and ultra-modern equipment to create products, such as:

  • Duplex Stainless Steel
  • Bright Round Bars
  • Precision Round Bars
  • Hexagon & Square Bars
  • Stainless Steel Flat Bars
  • Hot Rolled Steel Bars
  • Precipitation Hardening Steels
  • Forging Quality Ingots

Over the years, Ambica Steels has earned the status of an ISO 1400:2008 and ISO 9001 2010 certified organization due to our exceptional quality of management system. We have also received following accreditations marking our dedication to serve customers efficiently and effectively:

  • BS OHSAS 18001:2007
  • Z AMBICA 1326WL111860
  • AD 2000 MERKBLATT W0
  • PED 97 23 EC

To know more about our Duplex Stainless Steel product and other stainless steel products, please enquire now.