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Duplex Steel Pipes

Duplex Steel pipes have two structural phases, viz. Austenitic and Ferritic, which gives duplex stainless pipes the strength of ferritic and the corrosion resistance properties of austenitic. The mechanical properties of Duplex Steels are outstanding. Also, the corrosion resistance properties in these pipes are excellent. Different duplex stainless steel pipe grades are available, with varying attributes such as toughness, weldability and formability, corrosion resistance level and stress corrosion cracking resistance. The composition comprises chromium, molybdenum and nitrogen as alloying elements added to the iron and carbon matrix.

The production process involves pressing blocks called billets through rollers, and raw duplex steel pipes are born. Such billet material is cold-formed into duplex stainless steel pipe standards during final processing, ensuring strength characteristics per national standards such as ASTM A790 or ASME SA790.

Chloride pitting and crevice corrosion are not a problem for these pipes as the nitrogen, chromium and molybdenum content make them highly resistant. These duplex steel pipes are immune to stress-corrosion cracking. Duplex Steel pipes are added with less nickel and molybdenum than other austenitic grades, making them highly cost-effective. The increased tensile strength helps alter these pipes' sectional thickness against regular austenitic steels. 

Duplex Steel pipes find usage in many applications, such as processing plants, brewing tanks, hot water tanks and more. This is due to the stress-corrosion cracking resistance of the steel. The relatively low costs, general corrosion resistance and higher strength, make these duplex steel pipes more popular. Duplex stainless steel pipes are becoming increasingly popular among duplex stainless steel pipe suppliers due to their unique properties and wide range of applications. Their strength, corrosion resistance, and duplex stainless steel pipe price make them particularly attractive for various industrial environments. 

These duplex pipes require fewer repairs and can perform well in corrosive environments such as water treatment plants and refineries with the added advantage of routinely issuing decreased maintenance costs. Duplex stainless steel pipes from reliable duplex stainless steel pipe suppliers offer fewer hysteresis losses compared to other material alternatives and can be notably cleanable with solid thermal stability. Duplex stainless steel pipes provide a broad range of benefits that make them an ideal choice for any project requiring an enhanced level of protection.

FAQ's for Duplex Steel Pipes

Duplex stainless steel has a range of hardness properties, with the most common being Rockwell C (RC) Hardness. According to ASTM A240 specifications, RC hardness ranges from 28-33 for cold-worked conditions and 30-35 for hot-worked conditions. The higher the number, the more rigid and robust the material.

Duplex stainless steel is an alloy used in many different applications, including: Oil and gas pipelines: Duplex provides superior corrosion resistance to carbon steel, making it ideal for these harsh environments. Sewage and water treatment plants: Duplex works well in areas with high concentrations of salt, chemicals, or other contaminants. Marine environments: The duplex’s high strength and corrosion resistance make it a perfect fit for vessels exposed to the elements. Architectural applications: Duplex can be used for various projects due to its aesthetic appeal.

The Harmonised System of Nomenclature (HSN) code for duplex stainless steel pipes is 7304.

Duplex stainless steel pipes are available in grades like ASTM A789/A790, A928 and UNS S31803/S32205. They are characterized by high-strength corrosion resistance, higher creep strength, tensile strength, yield strength and fatigue resistance. The wall thickness ranges from 0.8mm to 55mm.

Duplex Steel Pipes products are typically around ₹450 to ₹500 per kilogram.

Nitech Stainless ainc

India

Bullion Pipe

India

JAINSON steel centre

India

Nirav overseas

India

MULTINOX INC

India

Leoscor Export

INDIA

Kenco tubes

India

Nitron Alloys Overseas

India

Aspirinox Alloys Inc.

India

Skyland Metal and Alloys Inc

India

Neelkamal Alloys LLP

India

Nirvana Piping Solutions

India

Neo Impex

India

Chhajed Steel And Alloys Pvt. Ltd.

India

arihant overseas

India

SANGHVI METAL CORPORATION

India

NILAM STEELAGE INDIA PRIVATE LIMITED

India

Calico Metal Alloys LLP

India

NEXTGEN STEEL AND ALLOYS

India

Padmavati Steel Engg Co.

India

Sangeeta Metal Corporation

India

Sanghvi Enterprises

India

Rishabh Steel Industries

India

Priminox Overseas

India

Zhejiang Zhonggang Steel

China

Leoscor Alloys & Steel Inc.

India

Kriton Steel And Engineering Co.

India

Katariya Steel

India

JAYDEEP STEELS

India

Neon Metals Impex Pvt. Ltd.

India

Bhansali Overseas

India

RENINE METALLOY

India

Nandishwar steel

India

mbm tubes pvt.ltd

India

NAMAN PIPE AND TUBES

India

PIYUSH STEEL PIPES

India

HIND METAL SYNDICATE PVT LTD

India

online metals india

India

RAJVEER STAINLESS AND ALLOYS

India

Shashwat Stainless Inc.

India

Aurum Alloys Engg. LLP

India

CITIZEN METALS PVT. LTD

India

Simplex Steel Industries

India

SAGAR PRAKASH ALLOYS

India

Shubh Alloys INC

India

M.A.International

India

Jaiman Metalloys LLP

India

Nexus Impex

India

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