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| Inox | |
|---|---|
| Name | Inox |
| Caption | Polished sheet of stainless steel |
| Category | Alloy |
| Composition | iron, chromium, nickel, carbon, molybdenum |
| Density | 7.7–8.1 g/cm³ |
| Melting point | 1375–1530 °C |
Inox Inox is a common name used internationally for a class of corrosion‑resistant steels produced for structural, industrial, and consumer uses. It denotes chromium‑bearing iron alloys engineered for surface passivity and mechanical performance, and is widely used in contexts ranging from Eiffel Tower restoration projects to equipment for International Space Station experiments. Major producers and standards bodies such as ArcelorMittal, Nippon Steel Corporation, Outokumpu, AISI, and EN 10088 define chemical compositions and processing parameters.
The term derives from French technical vocabulary associated with Saint-Étienne metallurgy and transmission through German Steel trading networks into global markets like Mumbai and Shanghai. Regional synonyms appear in catalogues from ThyssenKrupp, Tata Steel, and Voestalpine alongside trade names from AK Steel and POSCO. Standards groups including DIN, BSI, ASTM International, and ISO use overlapping terminology that maps to grade designations such as those by AISI and EN. Historical references trace popularization to promotional literature circulated by manufacturers at expositions like the Exposition Universelle.
Typical compositions balance iron with 10–30% chromium plus variable nickel, molybdenum, nitrogen, and carbon. Alloying elements are specified in standards from ASTM International, EN 10088, and JIS; specialist grades reference work by Corus Group and Norsk Hydro. Physical properties such as tensile strength and yield are compared in datasheets produced by Bureau Veritas, SGS, and Intertek; thermal behavior is analyzed in studies from MIT materials labs and Fraunhofer Society. Magnetic response varies across austenitic, ferritic, and martensitic families referenced in monographs from ASM International and research at Max Planck Institute for Iron Research.
Production pathways include blast furnace feeds coordinated by Rio Tinto and electric arc furnaces operated by ArcelorMittal and NLMK Group, with secondary metallurgy processes using vacuum oxygen decarburization and argon oxygen decarburization as practiced at Voestalpine Stahl. Hot rolling and cold rolling lines mirror installations at SSAB and Liberty Steel; heat treatments follow procedures published by Lloyd's Register and DNV GL. Surface finishing such as electropolishing, pickling, and passivation are carried out in plants managed by Outokumpu and service bureaus accredited by ISO 9001, with machining standards referenced from AGMA and welding codes from AWS and ASME.
Corrosion performance is evaluated using accelerated tests standardized by ASTM International (e.g., salt spray), ISO test methods, and protocols employed by NACE International. Comparative studies performed at TÜV Rheinland and academic groups at ETH Zurich and Imperial College London investigate pitting, crevice corrosion, and stress corrosion cracking in media characterized in reports by EPA and WHO. Protective passivation films are analyzed with techniques developed at Lawrence Berkeley National Laboratory and Argonne National Laboratory. Field failures are documented in case files from insurers such as Allianz and Zurich Insurance Group and forensic analyses by RINA.
Common classification systems include AISI 200, 300, and 400 series designations, EN numerical identifiers, and Japanese JIS listings. Certification and traceability are enforced through systems maintained by ISO 9001 registrars and conformity assessments by BV, DNV GL, and ABS. Specialty grades referenced in industrial procurement include those specified by NASA for aerospace hardware, FDA for food contact components, and EU directives concerning materials in medical devices regulated by EMA.
Applications span architecture projects such as cladding on structures designed by firms like Foster + Partners and Zaha Hadid Architects; transport uses in rolling stock by Siemens and Bombardier; and marine installations for Royal Caribbean class vessels. Inox alloys appear in consumer products from IKEA and KitchenAid, medical instruments for hospitals accredited by Johns Hopkins Hospital and Mayo Clinic, and chemical process equipment supplied to companies like BASF and Dow Chemical Company. Energy sector uses include heat exchangers for Siemens Energy turbines and components for offshore platforms certified by API standards.
Recycling pathways are integral to circular material flows coordinated by commodity traders including Glencore and Trafigura; secondary production is handled by firms such as Sims Metal Management. Life cycle assessments published by IPCC and IEA analyze embodied energy and carbon footprints of stainless products used in infrastructure projects by European Investment Bank and World Bank. Waste management and scrap recovery follow directives from EU recycling regulations and national agencies like EPA and SEPA; certifications for recycled content can be verified through schemes from RINA and UL.