Stainless Steel Pipe 304
When corrosion resistance, hygienic surface quality, and long-term structural integrity are non-negotiable — in food processing plants, pharmaceutical facilities, chemical handling systems, architectural installations, and critical industrial pipework — one grade has been the global benchmark for over a century. Stainless Steel 304 Pipe is that benchmark, and Venus Engineers supplies it to the highest standards of dimensional accuracy, surface finish, and material certification. As a leading Stainless Steel 304 Pipe Manufacturer and Supplier in Delhi, Gurgaon, NCR, and across India, Venus Engineers stocks and supplies SS 304 Pipes in seamless and welded configurations across a comprehensive range of sizes, wall thicknesses, schedules, and surface finishes — for structural, process, architectural, and sanitary applications across every major industry. With over 25 years of materials and engineering experience, every Stainless Steel 304 Pipe we supply is fully documented, dimensionally verified, and backed by mill test certification.
What is Stainless Steel 304 Pipe?
Stainless Steel 304 is the most widely used grade in the entire stainless steel family — an austenitic chromium-nickel alloy containing 18–20% chromium and 8–10.5% nickel, which together form a highly stable passive oxide layer on the steel surface that resists oxidation, rust, staining, and attack from a broad range of chemicals, acids, and environmental conditions. This combination of corrosion resistance, mechanical strength, weldability, and hygienic surface properties makes SS 304 the default specification for demanding applications across food, pharmaceutical, chemical, architectural, and industrial sectors worldwide.
The Stainless Steel 304 Pipe is manufactured from this grade in seamless or welded (ERW/TIG-welded) form, producing a pipe with a clean internal bore, precise dimensional tolerances, and a surface finish quality that ranges from standard mill finish to mirror polish or electropolished — depending on the application's hygiene, aesthetic, or corrosion requirements.
As an established Stainless Steel 304 Pipe supplier, Venus Engineers maintains ready stock across the most frequently specified sizes and wall thicknesses, sources exclusively from reputed domestic and international mills, and supplies material with full chemical and mechanical property certification to fabricators, contractors, OEMs, and project buyers across India.
Chemical Composition — SS 304
- Carbon (C) — 0.08 max
- Manganese (Mn) — 2.00 max
- Silicon (Si) — 0.75 max
- Chromium (Cr) — 18.00 – 20.00
- Nickel (Ni) — 8.00 – 10.50
- Nitrogen (N) — 0.10 max
- Phosphorus (P) — 0.045 max
- Sulphur (S) — 0.030 max
The 18% chromium content establishes the passive oxide layer that gives stainless steel its corrosion resistance. The 8–10.5% nickel content stabilises the austenitic microstructure across a wide temperature range, suppresses magnetic response, and significantly improves resistance to organic acids, food acids, and a broad range of industrial chemicals — making SS 304 a meaningfully more corrosion-resistant grade than the 200 series alternatives in demanding or exposed environments.
Technical Specifications
| Parameter | Specification |
| Grade | SS 304 / AISI 304 / UNS S30400 |
| Standard | ASTM A312, ASTM A554, ASTM A269, IS 6913 |
| Form | Welded (ERW / TIG) / Seamless |
| Outer Diameter (OD) | 6 mm to 323.8 mm (custom sizes available) |
| Wall Thickness | 0.5 mm to 10 mm / Schedule 5S to Schedule 80S |
| Length | 6 metres standard / cut-to-length available |
| End Finish | Plain end / Bevelled end / Threaded end |
| Surface Finish | 2B (mill finish) / No. 4 (brushed) / Mirror (No. 8) / Electropolished / Sanitary finish |
| Tensile Strength | 515 MPa min |
| Yield Strength | 205 MPa min |
| Elongation | 40% min |
| Hardness | HRB 92 max |
| Operating Temperature | –196°C to +870°C (intermittent) |
| Applicable Standards | ASTM, AISI, IS, DIN, JIS, EN (on request) |
| Mill Test Certificate | Available with each supply |
Key Features & Material Advantages
| Feature | Description |
| Superior Corrosion Resistance | The 18–20% chromium and 8–10.5% nickel content in SS 304 produces a robust, self-repairing passive oxide layer that resists corrosion in a wide range of environments — including humid and outdoor conditions, food acids (citric, acetic, lactic), mild chemical exposure, and industrial atmospheres. SS 304 Pipe significantly outperforms 200 series grades in any environment involving moisture, chemical contact, or outdoor exposure, and remains the minimum specification for food, pharmaceutical, and chemical process pipework. |
| Excellent Weldability | SS 304 is one of the most weldable stainless steel grades available. It can be joined by TIG, MIG, plasma, and resistance welding without significant risk of intergranular corrosion in standard thickness ranges — and with appropriate filler selection and post-weld treatment, welded SS 304 pipe assemblies retain full corrosion resistance across the weld zone and heat-affected area. For applications requiring welding followed by aggressive chemical exposure, SS 304L (low-carbon variant) is available on request. |
| Wide Temperature Range | SS 304 Pipe retains its mechanical properties and corrosion resistance across an exceptionally wide temperature range — from cryogenic service at –196°C through to elevated process temperatures up to 870°C intermittently. This makes SS 304 Pipe suitable for cold storage pipework, cryogenic systems, steam lines, heat exchangers, and high-temperature process applications that would rapidly degrade carbon steel or 200 series alternatives. |
| Hygienic Surface Quality | The smooth, non-porous surface of SS 304 Pipe — particularly in electropolished or sanitary finish — resists bacterial adhesion, is easily cleaned and sterilised, and does not react with food products, beverages, or pharmaceutical compounds. These properties make SS 304 Pipe the standard specification for food processing pipelines, brewery and dairy transfer lines, pharmaceutical process pipework, and any application where product purity and cleanability are regulatory requirements. |
| Non-Magnetic Austenitic Structure | SS 304 in the annealed condition is essentially non-magnetic — an important property for applications in the electronics, medical equipment, pharmaceutical instrumentation, and food processing sectors where magnetic interference or contamination from ferromagnetic particles must be avoided. |
| Long Service Life with Minimal Maintenance | A correctly specified and installed SS 304 Pipe system requires no painting, coating, cathodic protection, or routine anti-corrosion maintenance — unlike carbon steel, galvanised steel, or coated alternatives. The total cost of ownership over the service life of the installation typically justifies the higher initial material cost of SS 304 against lower-grade alternatives that require periodic replacement or surface treatment. |
Available Sizes & Dimensions
| OD (mm) | Wall Thickness / Schedule | Common Applications |
| 6 mm – 12.7 mm | 0.5 mm – 1.5 mm | Instrumentation lines, small-bore process, capillary |
| 19.05 mm (¾") | 1.0 / 1.5 / 2.0 mm | Sanitary lines, handrails, light structural |
| 25.4 mm (1") | 1.2 / 1.5 / 2.0 / Sch 10S | Process pipework, handrails, balustrades |
| 38.1 mm (1½") | 1.5 / 2.0 / Sch 10S / 40S | Process lines, structural, dairy / brewery |
| 50.8 mm (2") | 1.5 / 2.0 / Sch 10S / 40S | Process pipework, chemical lines, structural |
| 76.2 mm (3") | 2.0 / 3.0 / Sch 10S / 40S | Industrial process, HVAC, structural column |
| 101.6 mm (4") | 2.0 / 3.0 / Sch 10S / 40S / 80S | Heavy process, chemical, structural |
| 168.3 mm (6") | Sch 10S / 40S / 80S | Large-bore process, chemical plant, industrial |
| 219.1 mm (8") & above | Sch 10S / 40S / 80S | Heavy industrial, infrastructure, large-bore process |
| Custom sizes | As per requirement | OEM, special projects, process plant |
Surface Finish Options
| Surface Finish | Description |
| 2B Mill Finish | Standard cold-rolled and annealed finish from the mill. Smooth, slightly reflective, consistent grey-silver appearance. The default finish for industrial process pipework, structural applications, and any installation where the pipe surface is not visible or exposed to aesthetic scrutiny. |
| No. 4 Brushed Finish | Unidirectional brushed finish produced by progressive abrasive polishing. The most widely specified finish for architectural handrails, balustrades, kitchen equipment, commercial interiors, and any visible structural application where a clean, professional appearance is required. Provides good scratch resistance and is easy to maintain. |
| Mirror Finish (No. 8) | Highly reflective, near-mirror-polished surface produced by progressive buffing to maximum lustre. Specified for premium architectural installations, luxury interior fit-out, display and hospitality fixtures, and high-end decorative applications. |
| Electropolished Finish | Electrochemical surface treatment that removes the outermost surface layer, eliminating micro-roughness, embedded contaminants, and surface stress — producing an ultra-smooth, bright, and maximally corrosion-resistant surface. The standard finish for pharmaceutical process pipework, food and beverage sanitary lines, cleanroom installations, and any application requiring validated hygiene and cleanability. |
| Sanitary / Dairy Finish | Internal bore finish to Ra 0.8 µm or better, meeting 3-A Sanitary Standards and European Hygienic Engineering and Design Group (EHEDG) requirements for food, dairy, and pharmaceutical process pipework. Available with polished external finish and standard sanitary end connections (DIN, SMS, BS, or Tri-Clamp) on request. |
Industries & Applications We Serve
Venus Engineers supplies Stainless Steel 304 Pipes to a broad range of industries, fabricators, and project buyers across Delhi, Gurgaon, NCR, and pan-India, including:
| Food & Beverage Processing | Product transfer pipelines, CIP (clean-in-place) circuits, tank outlet pipework, bottling and filling lines, brewery and dairy transfer systems, juice and beverage processing |
| Pharmaceutical & Biotech | Process pipework, purified water and WFI distribution systems, clean steam lines, bioreactor connections, API manufacturing pipework — to GMP and FDA documentation standards |
| Chemical & Petrochemical | Mild acid and alkali transfer lines, solvent handling pipework, reactor inlet and outlet connections, chemical plant utility systems |
| Architecture & Construction | Handrails, balustrades, staircase railings, facade support structures, entrance canopies, curtain wall framing, outdoor architectural installations |
| HVAC & Building Services | Chilled water pipework, condenser lines, cooling tower piping, building utility systems in commercial and institutional buildings |
| Dairy & Breweries | Milk transfer lines, pasteuriser pipework, fermentation vessel connections, CIP return lines — to hygienic process standards |
| Oil & Gas (Utilities) | Utility water lines, instrument air pipework, chemical injection lines, offshore and onshore facility utility systems |
| Hospitals & Healthcare | Medical gas distribution, sterile water supply, CSSD pipework, laboratory services pipework |
| Automotive & Aerospace | Exhaust systems, hydraulic line tubing, precision instrument tubing, fuel system components |
SS 304 vs SS 202 vs SS 316 — Choosing the Right Grade
| Property | SS 202 | SS 304 | SS 316 |
| Chromium Content | 17–19% | 18–20% | 16–18% |
| Nickel Content | 4–6% | 8–10.5% | 10–14% |
| Molybdenum | None | None | 2–3% |
| Corrosion Resistance | Moderate (dry/indoor) | Good (general purpose) | Excellent (marine/chemical) |
| Chloride Resistance | Low | Moderate | High |
| Temperature Range | Limited | –196°C to +870°C | –196°C to +870°C |
| Weldability | Good | Excellent | Excellent |
| Relative Cost | Low | Medium | High |
| Best For | Architectural, indoor structural, furniture | Food, pharma, chemical, architectural, outdoor | Marine, coastal, high-chloride, aggressive chemical |
For most architectural, structural, food processing, pharmaceutical, and general industrial applications in non-coastal Indian environments, SS 304 Pipe is the correct and most cost-effective specification. SS 316 should be specified where chloride exposure, marine atmosphere, or aggressive chemical contact is a confirmed service condition.
Why Choose Venus Engineers for Stainless Steel 304 Pipes
Stainless steel pipe supply failures — incorrect grade, off-specification wall thickness, poor weld quality, or missing material certification — create problems that become apparent only after installation, when rectification is both costly and operationally disruptive. Venus Engineers eliminates this risk through rigorous mill sourcing, incoming inspection, and complete documentation at every supply stage.
- Reputed Mill Sourcing — SS 304 Pipes sourced exclusively from established domestic and international mills with consistent heat chemistry and traceable production records
- Mill Test Certificates — Full chemical and mechanical property material test reports (MTR) supplied with every order — essential for GMP, FDA, project QA, and third-party audit compliance
- Ready Stock — Popular sizes, wall thicknesses, and surface finishes maintained in ready stock for immediate dispatch — no lead time delays on standard project requirements
- Cut-to-Length Supply — Pipes supplied in exact cut lengths to customer drawing dimensions, reducing site waste, fabrication labour, and installation time
- Multiple Surface Finishes from One Source — 2B, brushed, mirror, electropolished, and sanitary finish pipes sourced and supplied from a single point of contact — simplifying procurement and ensuring finish consistency
- Grade Consultation — Expert guidance on SS 304 vs SS 304L vs SS 316 vs SS 202 selection for the specific application, environment, and regulatory requirements — preventing costly grade misspecification
- 25+ Years of Materials Experience — Deep knowledge of stainless steel grades, process applications, and industry standards across food, pharma, chemical, and architectural sectors
- Pan-India Supply — Stainless Steel 304 Pipes supplied to fabricators, contractors, OEMs, and project sites across all major Indian states with reliable logistics and full documentation
Frequently Asked Questions
