Inconel Pipes & Tubes
Inconel Alloys pipes & tubes supplied to ASTM B167 / B517 and ASTM B444 / B704 from our Mumbai stockyard. Inconel is a family of nickel-chromium alloys used where stainless steel fails: high temperature oxidation, aggressive acids, and combinations of heat, pressure and corrosion. The nickel base makes them essentially immune to chloride stress corrosion cracking. We supply Inconel in pipe, tube, bar, fittings, flanges and fasteners.
Governing Standards for Inconel Pipes & Tubes
State the standard on your enquiry and we will confirm stock against it.
| Standard | Covers |
|---|---|
| ASTM B167 / B517 | Alloy 600 pipe and tube |
| ASTM B444 / B704 | Alloy 625 pipe and tube |
Inconel 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 | Inconel 600 | Inconel 625 | Inconel 718 |
|---|---|---|---|
| Nickel | 72.0 min | 58.0 min | 50.0 – 55.0 |
| Chromium | 14.0 – 17.0 | 20.0 – 23.0 | 17.0 – 21.0 |
| Iron | 6.0 – 10.0 | 5.0 max | Balance |
| Molybdenum | — | 8.0 – 10.0 | 2.80 – 3.30 |
| Niobium + Tantalum | — | 3.15 – 4.15 | 4.75 – 5.50 |
| Titanium | — | 0.40 max | 0.65 – 1.15 |
| Aluminium | — | 0.40 max | 0.20 – 0.80 |
| Carbon | 0.15 max | 0.10 max | 0.08 max |
Inconel Pipes & Tubes Specifications
Inconel 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.
Inconel 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.).
Inconel 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 |
Inconel 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.
Inconel 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.
Inconel 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.
Inconel 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.
Inconel 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 Inconel for pipe work
Choose Inconel when service temperature exceeds the practical limit of austenitic stainless, when chloride stress corrosion cracking must be eliminated, or when the medium is aggressive enough to attack 316 and duplex. 625 is the general corrosion-resistant choice, 600 the high-temperature oxidation choice, 718 the high-strength precipitation-hardened choice.
Products in this range
Inconel in other forms
Full composition, properties and equivalents on the Inconel Alloys grade page.
Frequently Asked Questions
- Which Inconel grade should I specify?
- 625 is the general-purpose corrosion-resistant grade, combining seawater and acid resistance with good strength — the usual choice for offshore and chemical duty. 600 is for high-temperature oxidation resistance in furnace and heat-treatment service. 718 is precipitation hardened for high strength up to around 700°C and is the standard choice for turbine and high-load fastener applications. Send us the medium, temperature and pressure and we will confirm.
- Why is Inconel so much more expensive than stainless steel?
- It is 50–72% nickel against 8–14% in austenitic stainless, and nickel is the dominant cost. Molybdenum and niobium additions raise it further, and the alloys are harder to melt, form and machine. Where the service genuinely demands it the whole-life cost is usually lower than repeatedly replacing failed stainless components.
Send your Inconel 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.