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SS 304 is the world's most widely used austenitic stainless steel tube grade, valued as an "18/8" material for its 18-20% chromium and 8-10.5% nickel content, which together deliver excellent corrosion resistance, high mechanical strength, and outstanding weldability and formability. Siddhgiri Overseas manufactures SS 304 tubes from our Mumbai facility in seamless and welded construction, in round, square, rectangular, and custom profiles, to standards including ASTM A213, ASTM A269, and ASTM A554. With a smooth, hygienic, non-porous surface and reliable performance from cryogenic conditions up to 870°C of continuous service, SS 304 tube is the benchmark general-purpose stainless steel tubing specified across food processing, pharmaceutical, chemical, oil & gas, water treatment, construction, automotive, and architectural applications. Every tube is produced under strict process control and inspected before dispatch, giving fabricators and engineers a consistent, dependable material for both structural and process use.
SS 304 tube is a hollow section made from Grade 304 stainless steel, an austenitic alloy built around a balanced combination of chromium and nickel. The chromium forms a thin, self-healing passive oxide layer on the surface that resists corrosion, oxidation, and staining, while the nickel adds toughness, ductility, and overall structural stability. Because of this composition, SS 304 tube is often called 18/8 stainless steel, referencing its approximate chromium and nickel content.
Unlike carbon steel tube, SS 304 tube resists moisture, atmospheric exposure, and many industrial chemicals without requiring a protective coating. It has a smooth surface finish, good hygienic qualities, and strong fabrication properties — it can be readily welded, bent, machined, and polished — which is why it performs well in both structural and sanitary process applications.
Siddhgiri Overseas manufactures SS 304 tube in both seamless and welded construction. Seamless tube is formed from a solid billet with no weld joint, giving uniform strength around the full circumference and making it suitable for higher-pressure and more demanding service. Welded tube is roll-formed from stainless steel strip and joined using TIG or high-frequency welding, producing a consistent, economical tube for general fabrication and structural use. Both constructions are manufactured under strict quality control to maintain consistent mechanical properties, surface finish, and dimensional accuracy.
The chemical composition of SS 304 is carefully controlled to achieve its characteristic corrosion resistance and mechanical performance:
Mechanical properties of SS 304 tube meet the following minimums:
SS 304 tube offers excellent elongation, toughness, and impact resistance, which supports bending, forming, and welding without compromising structural integrity. In its annealed condition, SS 304 is virtually non-magnetic, though it can develop slight magnetism after severe cold working — a normal characteristic of this grade family and not an indicator of reduced quality.
SS 304 tube maintains stable performance across a wide temperature range, including continuous service at temperatures up to approximately 870°C, making it suitable for heat exchangers, boilers, and industrial processing systems. Siddhgiri Overseas manufactures SS 304 tube to standards including ASTM A213, ASTM A269, ASTM A312, and ASTM A554, along with applicable ASME, DIN, and EN specifications.
SS 304 tube is manufactured in several constructions and profiles to match the requirements of different applications:
Manufacturing begins with carefully selected Grade 304 stainless steel coils or billets meeting international composition and mechanical requirements. Depending on construction type, tubes are formed through piercing and cold drawing (seamless) or strip rolling and welding (welded), then cold-finished to achieve dimensional accuracy, wall thickness uniformity, and surface finish. Solution annealing relieves internal stresses and restores corrosion resistance after forming, and tubes are supplied in Bright Polish, pickled, satin, matte, mill, or mirror finishes. Every batch undergoes chemical composition analysis, tensile strength testing, dimensional inspection, hydrostatic testing, surface finish inspection, visual inspection, and weld quality examination before dispatch from our Mumbai facility.
The combination of corrosion resistance, hygiene, mechanical strength, and dimensional accuracy makes SS 304 tube suitable across a wide range of industries:
Siddhgiri Overseas supplies SS 304 tube in seamless and welded construction, in round, square, rectangular, and custom profiles, with the diameters, wall thicknesses, and finishes required for these applications, all backed by strict quality control and testing.
Siddhgiri Overseas is ISO certified for quality, occupational health & safety and environment management, and holds the import and export certification required to supply stainless steel pipe and tube to customers worldwide. Certificate copies are available on request for buyers who need them for their own compliance records.
SS 304 tube is made from Grade 304 austenitic stainless steel, containing 18% to 20% chromium and 8% to 10.5% nickel, along with controlled amounts of carbon, manganese, silicon, phosphorus, and sulfur. This composition gives it its characteristic corrosion resistance, strength, and formability, which is why it is commonly referred to as 18/8 stainless steel.
Seamless SS 304 tube is formed from a solid billet with no weld joint, giving uniform mechanical strength around its full circumference and stronger resistance to high pressure and corrosive conditions. Welded SS 304 tube is roll-formed from stainless steel strip and joined using TIG or high-frequency welding, offering consistent sizing and economical performance for general fabrication and structural applications.
SS 304 tube can be used in continuous service at temperatures up to approximately 870°C, making it suitable for heat exchangers, boilers, and other industrial processing systems that operate under sustained thermal loading.
Yes. SS 304 tube has a smooth, non-porous surface that resists contamination and is easy to clean, making it a standard material choice for food processing, dairy, brewery, and pharmaceutical manufacturing equipment.
SS 304 is virtually non-magnetic in its annealed condition. It can become slightly magnetic after severe cold working, which is a normal characteristic of this grade and does not indicate any reduction in quality or performance.
Our SS 304 tubes are manufactured to standards including ASTM A213, ASTM A269, ASTM A312, and ASTM A554, along with applicable ASME, DIN, and EN specifications, depending on the application and project requirements.
Siddhgiri Overseas manufactures SS 304 tube in round, square, and rectangular profiles, in both seamless and welded construction. Available surface finishes include Bright Polish, pickled, satin, matte, mill, and mirror finish, to suit both industrial and architectural requirements.
Every SS 304 tube undergoes chemical composition analysis, tensile strength testing, dimensional inspection, hydrostatic testing, surface finish inspection, visual inspection, and weld quality examination (for welded tube) before it leaves our Mumbai facility, ensuring compliance with the applicable international standard.
