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In the world of steel piping, the term “seamless” means perfection without a joint.
A seamless pipe is manufactured from a solid round billet, heated and pierced to form a hollow tube — without any weld seam.
Unlike ERW (Electric Resistance Welded) or welded pipes, seamless pipes have no weak point along their circumference, making them the preferred choice for high-pressure, high-temperature, and critical flow applications.
Engineers choose seamless pipes when safety, reliability, and long-term performance matter more than cost.
From refineries and petrochemical plants to power stations, offshore rigs, and process industries, seamless pipes are trusted wherever precision, pressure, and purity cannot be compromised.
The seamless pipe manufacturing process begins with a solid steel bar called a billet.
This billet is heated, pierced, elongated, and rolled using either a Mannesmann plug mill or a hot extrusion process.
After that, it undergoes sizing, heat treatment, and non-destructive testing (like ultrasonic, eddy current, or hydrotesting).
For precision-critical use, cold-drawn seamless pipes are further processed to meet exact OD, ID, and wall-thickness tolerances.
That’s why seamless pipes deliver:
| Feature | Seamless Pipe | Welded Pipe (ERW/LSAW) |
| Manufacturing Method | Made from solid billet, no weld | Rolled plate/sheet welded longitudinally or spirally |
| Strength | Uniform throughout | Weld joint is weaker |
| Pressure Handling | Higher (up to 20% more) | Limited to low-medium pressure |
| Applications | High pressure, high temperature | Structural, low pressure lines |
| Cost | Slightly higher | More economical |
| Inspection Need | No weld to test | Requires weld inspection (RT, UT) |
When safety, quality, and longevity are critical — seamless wins every time.
This is why global EPC contractors, oil companies, and process plant builders insist on ASTM A106, A312, A333, A335, and API 5L seamless pipes.
Inox Steel India offers seamless pipes from ½” NB to 24” NB (Nominal Bore) in schedules SCH 10 to SCH XXS.
We follow ASME B36.10 / B36.19 dimensional standards and can supply cut-to-length or custom machined ends (BE / PE / NPT / BSP).
Specifications Covered:
You can also access our Seamless Pipe Size Chart, Weight Chart, and HSN Code Reference to help buyers calculate exact shipping weight and price per kg.
Seamless pipe prices depend on material, size, and thickness.
For example:
₹110–₹145 per kg (≈ USD 1.5–1.8/kg)
₹300–₹480 per kg (≈ USD 3.8–5.7/kg)
₹200–₹450 per kg (≈ USD 2.5–5.5/kg)
Our Mumbai stockyard maintains ready inventory to serve urgent project needs in GCC, Africa, Europe, and the Americas.
Bulk buyers and EPC contractors can request volume-based pricing with MTC, IBR, and NACE MR0175 certificates.
Seamless pipes are used wherever fluids, gases, or steam are conveyed under pressure and temperature.
Typical applications include:
With over a decade of experience and multi-material capability — from Stainless Steel to Carbon, Alloy, Duplex, and Nickel Alloys with Product Pipes, Tubes, Bars we serve the world’s most demanding industries with trust, traceability, and timely delivery.
Stainless Steel Seamless Pipes form the backbone of hygienic and corrosion-resistant systems across process, chemical, and marine industries.
Manufactured as per ASTM A312 / A376, Inox Steel India supplies grades TP304, 304L, 316, 316L, 310, 321, 347, ensuring low-carbon variants (L-grades) for welded service and high-temperature versions for heaters and exhaust systems.
Why buyers choose SS seamless pipes:
Typical use: Refineries | Pharma | Food | Textile | Water Treatment | Marine Lines
When cost, pressure rating, and reliability meet, Carbon Steel Seamless Pipes dominate.
Manufactured to ASTM A106, A53, A333, API 5L, these pipes deliver toughness, weldability, and consistency under both ambient and extreme temperatures.
Grades offered:
Why engineers prefer Carbon Steel:
Used in: Power plants, refineries, offshore platforms, boilers, and LPG lines.
Alloy Steel Seamless Pipes are designed for high-temperature and high-pressure service.
Formulated with Chrome-Moly (Cr-Mo) alloys under ASTM A335 / ASME SA335, grades P11, P22, P91 offer superior creep strength and oxidation resistance.
Advantages:
Industries: Boilers | Pressure Vessels | Steam Lines | Reactors | Power Plants
Nickel Alloy Seamless Pipes represent the premium end of engineering materials for the harshest environments.
Manufactured as per ASTM B167, B444, these pipes withstand acidic, alkaline, and oxidizing media where ordinary stainless steels fail.
Material Highlights:
Used in: Marine, chemical reactors, desalination units, aerospace, and fertilizer plants.
Combining the strength of ferritic and austenitic microstructures, Duplex and Super Duplex Pipes (UNS S31803, S32750) delivered under ASTM A790 / A928, offer twice the strength of austenitic stainless steel with outstanding chloride pitting resistance.
Benefits:
Common uses: Oil rigs, heat exchangers, chemical process plants, and desalination units.
For marine condensers and heat exchangers, Copper Nickel (90/10, 70/30) pipes supplied as per ASTM B111 offer exceptional resistance to seawater and biofouling.
Brass pipes remain a staple for instrumentation and decorative industrial applications.
Why Cu-Ni stands out:
Applications: Shipbuilding | Heat Exchangers | Marine Cooling Systems | Fire Fighting Lines
Titanium Seamless Pipes (Gr 2 Commercially Pure & Gr 5 Ti-6Al-4V) under ASTM B338 / B861 represent the ultimate choice for light weight + corrosion resistance + strength.
Advantages:
Applications: Chemical Reactors | Aerospace Tubing | Marine Hardware | Power Plant Condensers
| Standard Code | Description / Material Scope | Common Grades Supplied |
| ASTM A106 / ASME SA106 | Carbon Steel Seamless Pipe for High Temp Service | Gr A, B, C |
| ASTM A53 / ASME SA53 | Carbon Steel Pipe for General Service | Gr A, B |
| ASTM A333 / ASME SA333 | Low Temp Carbon Steel Pipe | Gr 1 – 9 (LTCS) |
| ASTM A335 / ASME SA335 | Alloy Steel Seamless Pipe (Chrome-Moly) | P1, P5, P9, P11, P22, P91 |
| ASTM A312 / ASME SA312 | Stainless Steel Seamless Pipe | TP304, TP316L |
| ASTM A790 / ASME SA790 | Duplex & Super Duplex Pipe | S31803, S32205 |
| API 5L | Line Pipe for Oil & Gas Pipelines | Gr B, X42 – X80 |
| EN 10216-2 | Seamless Steel Pipes for Pressure Service | P235GH, P265GH |
| DIN 17175 | Seamless Tubes for Boiler Systems | ST35.8, ST45.8 |
| IS 3589 / IS 3601 | Carbon Steel Pipes for Water & Gas Transport | Class A / B |
Inox Steel India’s seamless pipes are exported to:
Each shipment includes MTC (EN 10204 3.1 / 3.2) and full traceability to heat number and mill origin.
Talk to our experts for technical support, pricing, and bulk orders.
| Industry / Process | Typical Standard & Grade | Purpose / Application |
| Process Piping | ASTM A106 / A312 / A335 | Transfer of steam, chemical fluids, and gases in refineries & chemical units |
| Oil & Gas Pipelines | API 5L Gr B – X65 | Crude / natural gas transmission / offshore lines |
| High-Temperature Service | A335 P11 / P22 / P91 | Boilers / superheaters / steam lines |
| Low-Temperature Service | A333 Gr 6 | LNG / cryogenic systems / cold storage plants |
| High-Pressure Service | A335 / A106 Heavy SCH | Hydraulic & power circuits / feedwater systems |
| Structural Applications | A106 / EN 10210 | Columns / frames / machinery supports |
| Steam & Condensate Lines | A335 / A312 | Boilers / heat exchangers / condensers |
| Refinery & Petrochemical | A335 / A312 / B444 | Reactors / distillation units / furnace tubes |
| Power Plants & Reactors | A335 / A333 / A312 | Turbine lines / pressure vessels / headers |
| Water & Utility Lines | A53 / IS 3589 | Firefighting / chilled water / utility distribution |
| Material / Grade | Size Range (NB) | Schedule / Thickness | Approx. Price INR /kg | Approx. Price USD /kg |
| Carbon Steel A106 Gr B | ½″ – 24″ | SCH 40 – XXS | ₹ 110 – 145 | $ 1.4 – 1.8 |
| Carbon Steel A333 Gr 6 | ½″ – 16″ | SCH 40 – 160 | ₹ 130 – 160 | $ 1.6 – 1.9 |
| Stainless Steel 304 / 304L | ½″ – 12″ | SCH 10 – 80 | ₹ 300 – 380 | $ 3.8 – 4.5 |
| Stainless Steel 316 / 316L | ½″ – 12″ | SCH 10 – 80 | ₹ 360 – 480 | $ 4.5 – 5.8 |
| Alloy Steel P11 / P22 / P91 | 1″ – 24″ | SCH 40 – 160 | ₹ 220 – 450 | $ 2.7 – 5.5 |
| Duplex S31803 / S32205 | ½″ – 12″ | SCH 10 – 80 | ₹ 450 – 650 | $ 5.5 – 7.9 |
| Nickel Alloys (Inconel / Monel / Hastelloy) | ½″ – 8″ | SCH 10 – 80 | ₹ 900 – 2,500 | $ 11 – 30 |
| **Copper Nickel 90/10 | 70/30** | ½″ – 8″ | SCH 10 – 80 | ₹ 600 – 950 |
| Aluminium 6061 / 6082 T6 | ½″ – 10″ | SCH 10 – 80 | ₹ 350 – 500 | $ 4.2 – 6.0 |
| Titanium Gr 2 / Gr 5 | ½″ – 6″ | SCH 10 – 40 | ₹ 2,000 – 4,500 | $ 24 – 54 |
Note: Prices vary with size, schedule, origin (SAIL / AMNS / Jindal / Nippon / Outokumpu / VDM / ATI), and market conditions.
Every Inox Steel India pipe is supplied with:
52-A, Mulji Thackersi Bldg, Islampura Street, Shop No. 10, Near Alankar Cinema, Mumbai – 400 004
info@inoxsteelindia.com
+91 9820920268
Seamless pipes are used for transporting fluids and gases under high pressure and temperature in oil & gas, power, chemical, and refinery applications.
It is made by piercing a solid billet to form a hollow tube followed by hot rolling or cold drawing — without any weld joint.
Seamless pipes have no weld seam and are stronger for high-pressure use. Welded pipes are made by rolling and joining plates, suitable for low pressure.
Standard sizes range from ½″ NB to 24″ NB with schedules SCH 10 to XXS. Custom dimensions are available on request.
Use our Seamless Pipe Weight Calculator based on OD, thickness, and length to estimate shipping weight and price per kg.
Yes, all pipes are available with NACE, IBR, and TPI certification as per project specification.
Yes, Inox Steel India exports to the Middle East, Africa, Europe, America, and Asia — door-to-port and door-to-site logistics supported.