Stainless Steel 304 Pipes & Tubes

Stainless Steel 304 Pipes & Tubes Manufacturer, Supplier & Exporter in India

Amardeep Steel Centre is a Mumbai based manufacturer, stockist and exporter of stainless steel 304 pipes and tubes, supplying ASTM A312 TP304 and ASME SA312 material to food and beverage, chemical, pharmaceutical, architectural, water treatment and general industrial projects since 1982. SS 304 pipe is held ex-stock in seamless, welded, ERW and EFW construction from 1/8 inch NB to 30 inch NB, in schedules from SCH 5S through XXS, and dispatched to more than 40 countries.

Grade 304 is the default austenitic stainless because it solves the widest range of problems at the lowest cost. Where chloride exposure is the governing risk, the molybdenum-bearing 316 family is the correct step up. Where the pipework will be

extensively field welded and cannot be solution annealed afterwards, the low-carbon 304L variant is safer. We stock all three, and our technical team will tell you plainly when 304 is enough and when it is not.

Every consignment ships with an EN 10204 3.1 Mill Test Certificate, with 3.2 certification, IBR Form III-D and third party inspection by SGS, Bureau Veritas, TUV or Lloyd's available on request. Request a quote with your NPS, schedule and quantity and our team will confirm price and availability the same working day.

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What Is Stainless Steel 304 Pipe?

Stainless steel 304 pipe is the most widely specified grade of austenitic stainless steel pipe in industrial use. Its composition, roughly 18 to 20 percent chromium and 8 to 10.5 percent nickel, gives it a stable chromium oxide passive layer that resists a broad range of corrosive media, which is why the grade is informally called 18/8 stainless steel. SS 304 pipes combine that corrosion resistance with formability close to mild steel, good weldability without special filler requirements in most cases, and a clean hygienic surface, which makes them the default across food processing, chemical handling, architecture and general fabrication wherever a fully exotic alloy is not required. Our reference on 304 stainless steel composition, uses and properties covers the metallurgy in more depth, and what stainless steel pipes are and their types explains where 304 sits in the wider family.

ASTM A312 TP304 Pipe Specification: A312, A358, A213, A249 and A269 Explained

ASTM A312 is the governing US specification for seamless and welded austenitic stainless steel pipe intended for high temperature and general corrosive service; the ASME mirror is SA312. Within A312, TP304 designates standard-carbon Grade 304 and TP304L the low-carbon variant. Buyers asking for “ASTM A312 TP304 pipe” almost always mean this standard. The related specifications cover different product routes:

SS 304 Pipe Size Chart in MM: 304 Stainless Steel Tube Sizes

SS 304 pipe dimensions are set by NPS (nominal pipe size in inches) or DN (nominal diameter in mm) combined with a schedule that fixes wall thickness. Outside diameter is constant for a given NPS regardless of schedule; only wall thickness, and therefore bore and weight, changes. The table below is the complete ss 304 pipe size chart in mm across the schedules we stock.

Wall thickness in mm. Sizes above 16" NB are typically supplied as EFW or LSAW welded pipe per ASTM A358 / ASME SA358. Sizing conventions are explained in our guide to steel pipe sizes and nominal pipe size, and the full range is in our pipe dimension chart.

304 stainless steel tube sizes in fractional OD

For instrumentation, hydraulic and precision applications the controlling dimension is exact outside diameter rather than NPS. We stock 304 tube from 1/16 inch to 3 inch OD in wall thicknesses from 0.010 inch to 0.250 inch, to ASTM A269 and ASTM A213.

Related: 304 coil tubing, stainless steel micro tubes, instrumentation tubing and bright annealed tubing to ASTM A269.

SS 304 Pipe Weight Chart: Weight Per Metre by Schedule

Per-metre weights are calculated from OD and wall thickness at the standard stainless density of 8,000 kg/m3. Use the kg/m figure to convert any per-metre quotation to a per-kg basis when comparing offers.

For a size or schedule not listed, use our steel weight calculator. The schedule system itself is explained in our guide to the difference between Schedule 40 and Schedule 80 pipe, and we hold dedicated Schedule 40 and Schedule 80 stock pages.

SS 304 Pipe Schedule Chart and Thickness Chart

304 stainless steel pipe schedule determines wall thickness at a given nominal bore. The chart below answers the schedule and thickness queries directly: sch 5, sch 10, sch 20, sch 40 and sch 80 wall thickness in mm for every stocked NB.

Unit Weight of SS 304 and Common Pipe Weights by Size

Two related questions come up constantly: what does 304 stainless weigh per unit volume, and what does a specific pipe size weigh per metre. Both are answered below.

Density and unit weight: 304 stainless steel has a density of 8,000 kg per cubic metre, or 8.0 g per cubic cm. That figure is the basis for every weight in the charts on this page. Unit weight of an SS 304 pipe in kg per metre is calculated as 0.02466 multiplied by wall thickness in mm multiplied by (OD in mm minus wall thickness in mm).

Common sizes, SCH 40S, in kg per metre and kg per 6 metre length:

For any size not listed, our steel weight calculator computes 304 stainless steel pipe weight from OD, wall thickness and length. See also our reference on the density of stainless steel 304.

SS Pipe Grade Chart: Where 304 Sits Among Stainless Grades

Buyers searching ss pipe grade, ss pipe grade chart and stainless steel pipe grades chart are trying to place 304 against the alternatives before they specify. This table answers that in one view.

Full detail on each grade: 304L, 304H, 316, 316L, 310S, 321 and 904L. Our stainless steel pipes and tubes hub covers the full range.

SS 304 Meaning: SS, TP304, SUS 304 and 18/8 Explained

Terminology on a purchase order is not always consistent between the buyer, the mill and the inspector. These are the terms that appear on SS 304 pipe documentation and what each one means.

SS 304 Pipe Pressure Rating: ASTM A312 TP304 Seamless

Indicative maximum working pressures in psig for standard seamless A312 TP304 pipe, per ANSI/ASME B31.1, from 100 F to 750 F. Pressure capability falls as temperature rises, which is the single most common oversight when a schedule is selected on room-temperature figures alone.

All values in psig. Indicative only. Verify against ASME B31.1 or B31.3 and your project code using mill-certified wall thickness before use in design. These figures do not constitute a design specification.

SS 304 Chemical Composition: UNS S30400 and DIN 1.4301

Values in percent per ASTM A312 Table 1. The chromium content forms the passive oxide layer; the nickel stabilises the austenitic structure and delivers the formability and toughness that make 304 easy to fabricate. Carbon is the only meaningful difference across the 304 family, and it is what determines weldability and high-temperature strength.

Equivalent Grades for 304 Stainless Steel Pipe

A pipe ordered as TP304, UNS S30400, 1.4301, SUS 304 or X5CrNi18-10 is the same material for all practical chemistry and mechanical purposes. We can certify against any of these designation systems on the Mill Test Certificate.

Mechanical & Physical Properties of Stainless Steel 304 Pipes & Tubes

The 8,000 kg/m3 figure is the basis for every weight in the chart above. See our reference on the density of stainless steel 304 for volume and weight calculations.

SS 304 vs 316 Stainless Steel Pipe: Which Grade Do You Need?

This is the single most common specification question in stainless piping, and the answer turns entirely on chlorides.

In short: specify 304 unless chlorides, seawater, coastal atmosphere or aggressive cleaning chemistry are part of normal operation, in which case step to SS 316 pipes and tubes. Our guides on 304 vs 316 stainless steel and the difference between SS 304 and SS 316 work through the trade-off with worked examples.

TP304 vs TP304L vs TP304H: Carbon Is the Only Real Difference

See also SS 304L pipes and tubes and SS 304H pipes and tubes. Where temperature exceeds what the 304 family handles, 310S and 321 are the usual next steps.

Types, Forms & Shapes of SS 304 Pipe and 304 SS Tubing

By construction:

• SS 304 seamless pipe: extruded or drawn from solid billet with no longitudinal weld; preferred for higher pressure, hygienic and IBR-certified service. See seamless pipes and tubes.
• SS 304 welded and ERW pipe: strip rolled and welded longitudinally; the most cost-effective route for general process and moderate pressure service. See welded pipes and tubes.
• SS 304 EFW pipe: electric fusion welded, for large bore from 6" to 100" NB per ASTM A358.
• SS 304 LSAW pipe: longitudinal submerged arc welded, for large diameter heavy wall applications.
• SS 304 fabricated pipe and spools: custom rolled, bent and flanged to drawing by our piping solutions team.

Round is the default, but we also supply 304 square tube, 304 rectangular tube and 304 oval pipe to ASTM A554 for structural, ornamental, handrail and hollow section work, plus hexagonal, capillary, U-shaped and pan-cake coil forms to order. 304 exhaust tubing, automotive trim sections and architectural profiles are all supplied from the same A554 mechanical tubing range.

SS 304 Seamless Pipe vs Welded Pipe: Comparison

Our article on the difference between seamless and welded pipe works through the selection logic in detail.

Dimensional Tolerances for ASTM A312 TP304 Pipe

Outside diameter tolerance

Wall thickness tolerance

Length tolerance: fixed length plus 10 mm, minus 0 mm. Standard lengths are single random and double random per ASTM A312.

Surface Finish Options for 304 Stainless Steel Pipe & Tubing

Passivation per ASTM A380 is available after welding or machining to restore the oxide layer. For hygienic tube see our sanitary tubing to ASTM A249, A269 and A270 and welded austenitic tube to ASTM A249/A269 ranges.

304 Stainless Steel Pipe Price: What Drives SS 304 Pipe Price Per Kg

SS 304 pipe price is driven primarily by current LME nickel and base stainless coil or billet rates, since nickel at 8 to 10.5 percent is the single largest cost input in the alloy. Beyond raw material, price moves with:

• Construction: seamless commands a premium over welded and ERW
• Schedule and wall thickness: heavier wall means more kg per metre
• Surface finish: polished and electropolished cost more than mill finish or AP
• Order quantity: container-load and full-coil quantities attract better rates
• Certification scope: 3.2 MTC, IBR and third-party inspection add cost
• Freight and destination, for export orders

Because nickel and stainless coil prices move daily, we do not publish a fixed online 304 stainless steel pipe price list. Buyers should request a same-day quote against their exact size, schedule and quantity.

For an accurate, current SS 304 pipe price list, share your NPS, schedule, length and quantity or your full BOQ. We quote both per-metre and per-kg equivalents so you can compare directly against any competing offer, and we issue indicative pricing the same business day for standard stocked sizes. Get today's 304 pipe price.

HSN Code for Stainless Steel 304 Pipe

HSN classification is indicative and depends on end use and the exact product form. Confirm with your customs broker before filing.

Stock Availability: Ex-Stock SS 304 Pipe Sizes in Mumbai

If your size is not listed we manufacture to custom specification, typically within two to four weeks. Check availability.

Testing, Inspection & Certification of SS 304 Pipes & Tubes

• Chemical analysis and Positive Material Identification by XRF or OES
• Mechanical testing: tensile, yield, elongation and hardness per heat and lot
• Intergranular corrosion testing to ASTM A262 Practice A and E
• Hydrostatic testing per ASTM A312
• Non-destructive testing: radiography, ultrasonic, eddy current and dye penetrant
• Flattening, flaring and bend tests for tube products per ASTM A213 and A249
• Visual and dimensional inspection covering OD, wall, length, straightness and surface
• Third-party inspection by SGS, Bureau Veritas, TUV, Lloyd's Register or client-nominated agencies

Documentation includes a Mill Test Certificate to EN 10204 Type 3.1 as standard, Type 3.2 on request, IBR Form III-D for boiler and pressure applications, and NABL-accredited lab reports where required. NACE MR0175 sour service material is available. View our quality certifications and testing capabilities.

Applications of SS 304 Pipes & 304 SS Tubing

• Food, beverage and dairy processing equipment and hygienic piping
• Chemical, petrochemical and pharmaceutical process lines
• Architectural railings, handrails, facades and structural trim
• Automotive exhaust systems, manifolds and trim
• Water treatment, wastewater and plumbing networks
• Power generation: heat exchanger tubes, condenser tubes and boiler tubes
• Boiler and pressure piping under IBR certification
• Mining, pulp and paper, fertiliser and general engineering fabrication

Why Choose Amardeep Steel for SS 304 Pipes & Tubes

• Established in 1982 with more than 40 years supplying stainless steel pipes, tubes and fittings
• Direct manufacturer and stockist, controlling quality end to end rather than reselling third-party stock
• Deep ready inventory across all major sizes and schedules for same-week dispatch
• ISO 9001:2015 certified, EN 10204 3.1 MTC with every order, 3.2 and IBR Form III-D on request
• Same-day indicative pricing on standard stocked sizes, quoted per metre and per kg
• Exports to more than 40 countries with full export documentation handled in house

Export & Packaging

We export SS 304 pipes and tubes worldwide from Mumbai, with regular shipments to the Middle East, Africa, Southeast Asia, Europe and the Americas on FOB, CIF and EXW terms. Every export consignment includes the commercial invoice, packing list, certificate of origin, EN 10204 3.1 Mill Test Certificate and any third-party inspection certificates required. Pipes are bundled with steel strapping, fitted with plastic end caps, wrapped against transit corrosion and packed in seaworthy wooden cases. Each length is marked with NB, schedule, specification, grade, heat number and manufacturer's symbol for full traceability.

Related Products

304 family: 

SS 304L Pipes & Tubes, SS 304H Pipes & Tubes, SS 304 Flanges, SS 304 Buttweld Fittings, SS 304 Forged Fittings, SS 304 Plates, Sheets & Coils, SS 304 Coil Tube

Other grades: 

SS 316, SS 316L, SS 310S, SS 321, SS 904L, Duplex 2205

Parent category: 

Stainless Steel Pipes & Tubes, Stainless Steel Bars, Rods & Wires

Further reading: 

304 vs 316 stainless steel, density of stainless steel 304, seamless vs welded pipe, steel pipe sizes explained, complete guide to stainless steel tubing, difference between pipe and tube