Grade 904L stainless steel is a non-stabilized austenitic stainless steel with low carbon content. This high alloy stainless steel is added with copper to improve its resistance to strong reducing acids, such as sulphuric acid. The steel is also resistant to stress corrosion cracking and crevice corrosion. Grade 904L is non-magnetic, and offers excellent formability, toughness and weldability.Grade 904L contains high amounts of expensive ingredients, such as molybdenum and nickel. Today, most of the applications that employ grade 904L are replaced by low-cost duplex stainless steel 2205.
Stainless steel pipes are a type of steel pipe that possesses the ability to resist corrosion from weak corrosive media such as air, water, and steam, as well as chemical corrosive media like acids, alkalis, and salts. Classification:According to production methods: seamless steel pipes and welded pipes can be classified. Seamless steel pipes are made by piercing steel ingots or solid tube blanks to form rough tubes, and then through hot rolling, cold rolling or cold drawing, they are transformed into final products; welded pipes are manufactured through welding processes, including straight seam welded pipes and spiral welded pipes, etc.According to cross-sectional shapes: there are round pipes and special-shaped pipes. Round pipes are the most common type and are widely used in various fluid transportation and mechanical structural components; special-shaped pipes include rectangular pipes, rhombic pipes, elliptical pipes, etc., which are suitable for various structural components, tools and mechanical parts.According to uses: they can be classified as oil well pipes, pipeline pipes, boiler pipes, mechanical structure pipes, gas cylinder pipes, chemical pipes, etc.Material characteristics:Corrosion resistance: Alloy elements such as chromium, nickel, and molybdenum can form a dense passivation film on the surface of steel pipes, effectively preventing the erosion of oxygen and other corrosive substances.High strength and toughness: While maintaining high corrosion resistance, they possess high strength and good toughness, capable of withstanding large pressure or mechanical impacts.Good processability: They have good plasticity and weldability, making it easy to process into various shapes and sizes, meeting the diverse needs of different fields for pipe materials. Application fieldsConstruction field: Used for handrails, railings, doors, windows, curtain walls, etc., as well as as pipeline materials for water supply and heating systems.Petrochemical industry: Due to its excellent corrosion resistance and high strength, it becomes an ideal choice for transporting various corrosive media.Food and medicine: Stainless steel pipes for food and medicine have strict requirements for the content of harmful elements. The surface of the inner and outer layers is highly smooth, and there is little medium adhesion, which is conducive to corrosion resistance and flushing. It is widely used in beverage production lines, pharmaceutical pipeline systems, etc.Environmental protection and water treatment: In water treatment and environmental protection projects, due to its acid and alkali resistance and corrosion resistance characteristics, it is used in sewage treatment, seawater desalination and other systems.