Duplex steel flanges are fittings used to connect pipes or valves in high-corrosion environments, combining properties from austenitic and ferritic stainless steels for greater corrosion resistance and strength. Offering exceptional strength, stress corrosion cracking resistance and exceptional durability they make duplex steel flanges an excellent choice for demanding industries such as oil & gas, chemical processing or marine engineering applications.
Duplex steel flanges boast excellent machinability due to their balanced microstructure. However, duplex stainless steels tend to be harder than austenitic stainless steels when it comes to milling them; therefore selecting appropriate tool and milling parameters are crucial in reaching desired results.
Duplex steel flanges stand out with their superior corrosion resistance. Their resistance to chloride stress corrosion cracking makes them suitable for harsh environments like marine applications or chemical processing industries.
Duplex steel flanges offer excellent weldability for easy fabrication and installation, yet to preserve their integrity it is crucial that proper welding techniques be utilized, along with materials designed specifically to tackle duplex stainless steels in order to use filler materials tailored towards maintaining weld joints without intergranular corrosion issues arising.
Duplex steel flanges find applications across multiple industries where corrosion resistance and mechanical strength are of primary concern, including offshore oil and gas exploration, chemical processing plants, desalination facilities and pulp and paper factories. They're especially valued in offshore exploration situations.
Duplex steel flanges have long been employed in offshore oil and gas exploration due to their resistance to corrosion in seawater environments, while in chemical processing plants they serve to connect pipes carrying corrosive fluids, while desalination plants also rely on duplex steel flanges as part of high pressure piping systems. Furthermore, pulp and paper industries rely heavily upon them in processing equipment where corrosion resistance and abrasion resistance is essential to long-term operational effectiveness.
Apple Steels is a reputable manufacturer and supplier of Duplex Steel Flanges in Mumbai, India. Renowned for quality and reliability, they provide a wide range of duplex steel flanges for various industrial applications, offering superior corrosion resistance and durability.
Raw Material
At the very first process, the system controls check the quality of supplies raw materials as per the test certificate and also visual and dimension.
Material Inspection
Incoming quality control (IQC) is the process of observes the quality of materials and parts for manufacturing a product before production starts.
Material Cutting
In this process refers to manufacturing flanges by cutting stripes from the middle plate and then rolling them into round shape.
Flange Forging
Forged flanges generally have lower carbon content than cast flanges and are less disposed to rust. In Forgings Material Grade Check, weight measuring, and control the temperature.
Final Inspection
In this method measure & inspect the dimension & size of the flange. The diameter is check to control what size pipe a flanges can be used.
| Standard | ASTM A182 / ASME SA182 |
| Dimensions | ANSI/ASME B16.5, B16.47 Series A & B, B16.48, BS4504, BS 10, EN-1092, DIN, ANSI Flanges, ASME Flanges, BS Flanges, DIN Flanges, EN Flanges, GOST Flange, ASME/ANSI B16.5/16.36/16.47A/16.47B, MSS S44, ISO70051, JISB2220, BS1560-3.1, API7S-15, API7S-43, API605, EN1092 |
| Flange Size Chart | 1/2" (15 NB) to 48" (1200NB), DN10~DN5000 |
| Pressure Rating | Class 150 LBS, 300 LBS, 600 LBS, 900 LBS, 1500 LBS, 2500 LBS |
| Pressure Calculation in DIN | 6Bar 10Bar 16Bar 25Bar 40Bar / PN6 PN10 PN16 PN25 PN40, PN64 |
| JIS | 16 K, 5K, 10 K, 20 K, 30 K, 40 K, 63 K |
| Flange Connection / Flange Face Type | Raised Face (RF), Ring Type Joint (RTJ), Flat Face (FF), Large Male-Female (LMF), Lap-Joint Face (LJF), Small Male-Female (SMF), Small Tongue, Large Tongue & Groove, Groove, Flange Pipe. |
| Origin | West Europe / Japan / Indian / USA / Korean |
| Types of Flanges | Threaded / Screwed / Forged / Plate |
| Coating | Yellow Transparent, Zinc Plated, Anti-rust Paint, Oil Black Paint, Cold and Hot Dip Galvanized |
| Test Of Flange | Direct-reading Spectrograph, Ultrasonic flaw detector, Magnetic particle detector, X-ray detector, Hydrostatic testing machine. |
| Production technique Used | Heat treated, Forged and Machined |
| Equipment | Press machine, Bending machine, Pushing Machine, Sand-blasting machine, electric bevelling machine etc. |
| Test Certificates | EN 10204/3.1B, Raw Materials Certificate, 100% Radiography Test Report, Third Party Inspection Report, etc |
Electrical Industry
Automotive Industry
Construction Industry
Defence Industry
Pharmaceutical Industry
Petroleum Industry
Petrochemical Industry
Milk & Dairy Industry
Malta, Latvia, Monaco, Russia, Luxembourg, Austria, Italy, Switzerland, Poland, Estonia, Turkey, Netherlands, Hungary, Portugal, Sweden, Norway, Finland, Romania, Croatia, Lithuania, Czechia/Czech Republic, Liechtenstein, Azerbaijan, Bulgaria, United Kingdom, Greece, Ireland, Cyprus, Slovakia, Germany, Belarus, Spain, France, Serbia, Moldova, Belgium, Ukraine, Denmark.
North Korea, China, Indonesia, Bahrain, British, Armenia, Russia, Bangladesh, South Korea, Philippines, Kuwait, Thailand, Sri Lanka, Kyrgyzstan, Oman, Mongolia, Macau, Vietnam, Myanmar, Turkey, Qatar, Egypt, Japan, Israel, Nepal, Taiwan, Malaysia, Iraq, Azerbaijan, United Arab Emirates, Singapore, Afghanistan, Iran, Hong Kong, Jordan, India, Saudi Arabia, Maldives, Lebanon, Bhutan.
Kenya, Zambia, Zimbabwe, Eswatini, Algeria, Libya, South Africa, Cameroon, Tanzania, Niger, Burkina Faso, Nigeria, Mauritania, Seychelles, Tunisia, Mauritius, Ethiopia, Central African Republic, Botswana, Burundi, Namibia, Mozambique, Senegal, Uganda, Madagascar, Liberia, Morocco, Rwanda, Gambia, Egypt, Angola.
Canada, Barbados, Bahamas, Grenada, Dominican Republic, United States of America, Saint Vincent and the Grenadines, Honduras, Cuba, Jamaica, Suriname, Venezuela., Nicaragua, Mexico, Colombia, Costa Rica, Argentina, Haiti, Panama, El Salvador, Peru, Uruguay, Guyana, Paraguay, Belize, Bolivia, Antigua and Barbuda, Chile, Brazil, Dominica, Trinidad and Tobago, Guatemala, Ecuador, Saint Lucia.
