SS 304 Pipes & Tubes
Stainless Steel 304 / 304L pipes & tubes supplied to ASTM A312 / A358 from our Mumbai stockyard. SS 304 is the most widely used stainless steel: an 18/8 austenitic grade with good corrosion resistance in atmospheric, freshwater and mild chemical service, excellent formability and straightforward welding. 304L, the low-carbon variant, is specified where the part is welded and heavy sections risk sensitisation.
Governing Standards for SS 304 Pipes & Tubes
State the standard on your enquiry and we will confirm stock against it.
| Standard | Covers |
|---|---|
| ASTM A312 / A358 | Seamless and welded pipe |
SS 304 Chemical Composition (%)
Composition and mechanical values are the limits set by the governing ASTM specification and are given for reference. The mill test certificate supplied with your consignment carries the actual heat analysis.
| Element | 304 (S30400) | 304L (S30403) |
|---|---|---|
| Carbon | 0.08 max | 0.030 max |
| Chromium | 18.0 – 20.0 | 18.0 – 20.0 |
| Nickel | 8.0 – 10.5 | 8.0 – 12.0 |
| Manganese | 2.00 max | 2.00 max |
| Silicon | 0.75 max | 0.75 max |
| Phosphorus | 0.045 max | 0.045 max |
| Sulphur | 0.030 max | 0.030 max |
| Nitrogen | 0.10 max | 0.10 max |
SS 304 Pipes & Tubes Specifications
SS 304 Pipes & Tubes — Chemical Composition
| Grade | C | Mn | P | S | Si | Cr | Ni | Mo | Other |
|---|---|---|---|---|---|---|---|---|---|
| TP 304 | 0.08 | 2.00 | 0.045 | 0.030 | 1.00 | 18.0–20.0 | 8.0–11.0 | — | N 0.10 |
| TP 304L | 0.035 | 2.00 | 0.045 | 0.030 | 1.00 | 18.0–20.0 | 8.0–13.0 | — | N 0.10 |
| TP 316 | 0.08 | 2.00 | 0.045 | 0.030 | 1.00 | 16.0–18.0 | 11.0–14.0 | 2.00–3.00 | N 0.10 |
| TP 316L | 0.035 | 2.00 | 0.045 | 0.030 | 1.00 | 16.0–18.0 | 10.0–15.0 | 2.00–3.00 | N 0.10 |
| TP 321 | 0.08 | 2.00 | 0.045 | 0.030 | 1.00 | 17.0–19.0 | 9.0–12.0 | — | Ti ≥ 5 × C |
| TP 347 | 0.08 | 2.00 | 0.045 | 0.030 | 1.00 | 17.0–19.0 | 9.0–13.0 | — | Nb ≥ 10 × C |
| TP 310S | 0.08 | 2.00 | 0.045 | 0.030 | 1.00 | 24.0–26.0 | 19.0–22.0 | — | — |
| TP 317L | 0.035 | 2.00 | 0.045 | 0.030 | 1.00 | 18.0–20.0 | 11.0–15.0 | 3.00–4.00 | N 0.10 |
Note: Per ASTM A312 / A240. Values are maximum % by weight unless a range is shown. ASTM A312 permits 0.035% max carbon on L grades, where ASTM A240 plate specifies 0.030% max.
SS 304 Pipes & Tubes — Mechanical Properties
| Grade | Tensile Strength (min) | Yield Strength 0.2% (min) | Elongation (min) | Hardness (max) |
|---|---|---|---|---|
| TP 304 | 515 MPa (75 ksi) | 205 MPa (30 ksi) | 35% | 90 HRB / 192 HBW |
| TP 304L | 485 MPa (70 ksi) | 170 MPa (25 ksi) | 35% | 90 HRB / 192 HBW |
| TP 316 | 515 MPa (75 ksi) | 205 MPa (30 ksi) | 35% | 90 HRB / 192 HBW |
| TP 316L | 485 MPa (70 ksi) | 170 MPa (25 ksi) | 35% | 90 HRB / 192 HBW |
| TP 321 | 515 MPa (75 ksi) | 205 MPa (30 ksi) | 35% | 90 HRB / 192 HBW |
| TP 347 | 515 MPa (75 ksi) | 205 MPa (30 ksi) | 35% | 90 HRB / 192 HBW |
| TP 310S | 515 MPa (75 ksi) | 205 MPa (30 ksi) | 35% | 90 HRB / 192 HBW |
Note: Specified minimum values in the solution-annealed condition, per ASTM A312 / A240. Elongation is measured in 50 mm (2 in.).
SS 304 Pipes & Tubes — Size Range & Supply Condition
| Parameter | Range |
|---|---|
| Nominal bore | 1/2" NB to 24" NB (larger on enquiry) |
| Outside diameter | 6 mm to 610 mm |
| Wall thickness | Schedule 5S, 10S, 20, 30, 40 / 40S, 60, 80 / 80S, 100, 120, 140, 160, XXS |
| Manufacturing type | Seamless, ERW, EFW and LSAW |
| Length | Single random 4–7 m, double random 9–13 m, or cut to length |
| End finish | Plain end, bevelled end (30° ± 5°), threaded |
| Surface | Annealed & pickled, bright annealed, mirror or satin polished |
| Governing standards | ASTM A312 / A358 / A790 / A106 / A53, ASME B36.10M & B36.19M |
SS 304 Pipes & Tubes — Pipe Dimensions & Weight Chart
| NPS | OD (mm) | Sch 10S | Sch 40S | Sch 80S |
|---|---|---|---|---|
| 1/2" | 21.3 | 2.11 mm / 1.02 kg/m | 2.77 mm / 1.29 kg/m | 3.73 mm / 1.65 kg/m |
| 3/4" | 26.7 | 2.11 mm / 1.30 kg/m | 2.87 mm / 1.72 kg/m | 3.91 mm / 2.24 kg/m |
| 1" | 33.4 | 2.77 mm / 2.13 kg/m | 3.38 mm / 2.55 kg/m | 4.55 mm / 3.30 kg/m |
| 1 1/4" | 42.2 | 2.77 mm / 2.75 kg/m | 3.56 mm / 3.46 kg/m | 4.85 mm / 4.55 kg/m |
| 1 1/2" | 48.3 | 2.77 mm / 3.17 kg/m | 3.68 mm / 4.13 kg/m | 5.08 mm / 5.52 kg/m |
| 2" | 60.3 | 2.77 mm / 4.01 kg/m | 3.91 mm / 5.54 kg/m | 5.54 mm / 7.62 kg/m |
| 2 1/2" | 73.0 | 3.05 mm / 5.36 kg/m | 5.16 mm / 8.80 kg/m | 7.01 mm / 11.63 kg/m |
| 3" | 88.9 | 3.05 mm / 6.58 kg/m | 5.49 mm / 11.51 kg/m | 7.62 mm / 15.57 kg/m |
| 4" | 114.3 | 3.05 mm / 8.53 kg/m | 6.02 mm / 16.38 kg/m | 8.56 mm / 22.75 kg/m |
| 5" | 141.3 | 3.40 mm / 11.78 kg/m | 6.55 mm / 22.18 kg/m | 9.53 mm / 31.56 kg/m |
| 6" | 168.3 | 3.40 mm / 14.09 kg/m | 7.11 mm / 28.80 kg/m | 10.97 mm / 43.38 kg/m |
| 8" | 219.1 | 3.76 mm / 20.35 kg/m | 8.18 mm / 43.36 kg/m | 12.70 mm / 65.88 kg/m |
| 10" | 273.0 | 4.19 mm / 28.31 kg/m | 9.27 mm / 61.44 kg/m | 12.70 mm / 83.08 kg/m |
| 12" | 323.8 | 4.57 mm / 36.67 kg/m | 9.53 mm / 75.27 kg/m | 12.70 mm / 99.30 kg/m |
Note: Outside diameter and wall thickness per ASME B36.19M. Weight is calculated for austenitic stainless at 8.0 g/cm3 and is indicative — actual weight varies with grade and mill tolerance. Each cell shows wall thickness / weight per metre.
SS 304 Pipes & Tubes — Square & Rectangular Sections
| Section | Size range | Wall thickness | Length |
|---|---|---|---|
| Square | 10 x 10 mm to 200 x 200 mm | 0.8 mm to 8 mm | 6 m / 12 m / cut to length |
| Rectangular | 10 x 20 mm to 200 x 400 mm | 0.8 mm to 8 mm | 6 m / 12 m / cut to length |
| Round (welded) | 6 mm to 610 mm OD | 0.6 mm to 12 mm | 6 m / 12 m / cut to length |
| Finish | Mill, matt, satin, No. 4 brushed, No. 8 mirror | — | — |
Note: Welded stainless steel hollow sections, supplied in 304/304L, 316/316L and 202. Other sizes are rolled to order.
SS 304 Pipes & Tubes — Physical Properties
| Property | SS 304 / 304L | SS 316 / 316L |
|---|---|---|
| Density | 8.00 g/cm³ | 8.00 g/cm³ |
| Melting range | 1400–1450 °C | 1375–1400 °C |
| Modulus of elasticity | 193 GPa | 193 GPa |
| Thermal conductivity (100 °C) | 16.2 W/m·K | 16.3 W/m·K |
| Specific heat (0–100 °C) | 500 J/kg·K | 500 J/kg·K |
| Thermal expansion (0–100 °C) | 17.2 µm/m·°C | 15.9 µm/m·°C |
| Electrical resistivity | 720 nΩ·m | 740 nΩ·m |
| Max continuous service temp. | ≈ 870 °C | ≈ 925 °C |
| Magnetic response (annealed) | Non-magnetic | Non-magnetic |
Note: Values at 20 °C unless stated. Thermal expansion matters when austenitic stainless is welded to carbon steel.
SS 304 Pipes & Tubes — Equivalent Grades Across Standards
| ASTM / AISI | UNS | EN / DIN | EN Name | JIS | GB |
|---|---|---|---|---|---|
| 304 | S30400 | 1.4301 | X5CrNi18-10 | SUS 304 | 06Cr19Ni10 |
| 304L | S30403 | 1.4307 | X2CrNi18-9 | SUS 304L | 022Cr19Ni10 |
| 316 | S31600 | 1.4401 | X5CrNiMo17-12-2 | SUS 316 | 06Cr17Ni12Mo2 |
| 316L | S31603 | 1.4404 | X2CrNiMo17-12-2 | SUS 316L | 022Cr17Ni12Mo2 |
| 321 | S32100 | 1.4541 | X6CrNiTi18-10 | SUS 321 | 06Cr18Ni11Ti |
| 347 | S34700 | 1.4550 | X6CrNiNb18-10 | SUS 347 | 06Cr18Ni11Nb |
| 310S | S31008 | 1.4845 | X8CrNi25-21 | SUS 310S | 06Cr25Ni20 |
| 430 | S43000 | 1.4016 | X6Cr17 | SUS 430 | 10Cr17 |
Note: Cross-reference for enquiries written against European, Japanese or Chinese standards. Equivalents are close but not always identical — check the composition limits before substituting.
SS 304 Pipes & Tubes — Ordering & Supply
| Parameter | Detail |
|---|---|
| Minimum order quantity | 5 kg (mixed sizes within a grade can be combined to reach the MOQ) |
| Price basis | Ex-works Mumbai, FOB or CIF — quoted per kg, per metre or per piece depending on the form |
| Lead time | Ready stock dispatched in 1–3 working days; mill orders typically 2–6 weeks |
| Certification | Mill test certificate to EN 10204 3.1 as standard; 3.2 with third-party witness, IBR and NACE MR0175 on request |
| Testing available | PMI, IGC (ASTM A262), hydrostatic, ultrasonic, radiographic, impact and hardness testing |
| Third-party inspection | Bureau Veritas, TÜV, DNV, SGS, Lloyd's Register, Intertek, RITES and client/EPC inspection |
| Packing | Wooden crates or pallets, plastic caps on pipe ends, VCI wrapping where required, seaworthy export packing |
| Payment terms | Advance, against proforma invoice, or LC at sight for export orders |
| Supply area | Across India and export to the Middle East, Europe, the USA, Africa and South East Asia |
| Product form | Pipes |
Note: Cut lengths, non-standard sizes and special certification are available on request. Prices are quoted against grade, size, schedule and quantity.
Values shown are the specified minima and maxima published in the governing standards and are given for guidance. The mill test certificate supplied with your consignment reports the actual results for that heat.
When to specify SS 304 for pipe work
Choose 304 for general corrosion resistance, food and dairy contact, architectural work and indoor process piping. Move up to 316 when chlorides are present — seawater, coastal air, brines or chlorinated cleaning chemicals — because 304 is vulnerable to pitting in those conditions.
Products in this range
SS 304 in other forms
- SS 304 Fittings
- SS 304 Flanges
- SS 304 Sheets, Plates & Coils
- SS 304 Bars & Rods
- SS 304 Channels & Angles
Full composition, properties and equivalents on the Stainless Steel 304 / 304L grade page.
Frequently Asked Questions
- What is the difference between 304 and 304L?
- 304L limits carbon to 0.030% against 0.08% for 304. The lower carbon reduces the risk of chromium carbide precipitation at grain boundaries during welding — sensitisation — which would otherwise leave the heat-affected zone vulnerable to intergranular corrosion. Specify 304L for welded heavy sections; 304 is adequate for thin sections and non-welded parts. 304L has slightly lower strength as a result.
- Is SS 304 suitable for seawater?
- No. Chlorides attack the passive layer on 304 and cause pitting and crevice corrosion. For seawater and chloride-bearing service use 316/316L, and for higher chloride levels or higher temperatures use Duplex 2205 or a super duplex grade.
Send your SS 304 Pipes & Tubes requirement
Give us the size, schedule or thickness, quantity and standard and we will confirm stock and send a firm price. Minimum order quantity 5 kg, mill test certificate to EN 10204 3.1 with every consignment.