Stainless Steel Seamless Pipe Manufacturer in India

Stainless Steel Seamless Pipes are hollow, jointless pipes manufactured from solid stainless steel billets through processes such as piercing or extrusion, followed by hot working or cold drawing and heat treatment. Unlike welded pipes, they have no longitudinal weld seam. They are commonly specified for pressure, high-temperature and corrosive service, depending on the material grade, dimensions, manufacturing quality and applicable standard.

Kamal Steels is a Mumbai-based manufacturer and stockist of stainless steel seamless pipes, established in 1984. We manufacture and maintain stock of seamless pipes in a range of austenitic and duplex stainless steel grades, subject to size and availability. These pipes serve requirements across chemical, petrochemical, power generation, oil and gas and other industrial sectors.

Buyers can enquire about available grades, outside diameters, wall thicknesses, schedules, applicable standards and material test certificates (MTC).

Request a Quotation for Stainless Steel Seamless Pipes

Share your required grade, size, schedule and quantity with Kamal Steels to check availability and request a quotation.

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Common Grades of Stainless Steel Seamless Pipes

Grade choice depends on the fluid, temperature, chloride level and welding route. The tables summarise how each family is generally used; they do not state composition or mechanical values, which come from the product specification and the mill certificate. Not every grade is covered by every specification, and availability by size should be confirmed per enquiry.

Austenitic Grades

Duplex and Super Duplex Grades

Stainless Steel Seamless Pipes & Tubes Specifications

The parameters below are what a buyer should define for any seamless stainless steel pipe order. They describe the general industry framework. Kamal Steels' actual size range, wall thickness range and stock sizes before adding a range to this page.

Pipe versus Tube: How Sizes Are Expressed

Pipe sizes follow nominal pipe size and schedule, while tube sizes use the actual outside diameter and a wall thickness in mm or gauge. ASME B36.19M covers pipe dimensions; tube specifications such as ASTM A213 and A269 apply to tubing. Quoting the wrong convention is a common cause of enquiry back-and-forth, so state OD and wall thickness in mm when in doubt.

Key Standards for Seamless Stainless Steel Pipes

Standards play different roles. A product specification sets chemistry, manufacture, testing and tolerances; a dimensional standard fixes sizes and schedules. An order normally cites one of each. No single standard applies to every seamless pipe.

Product Specifications

Dimensional and General-Requirements Standards

The German national adoption of the European standard is DIN EN 10216-5.

Seamless vs Welded Stainless Steel Pipes

Seamless pipe has no longitudinal seam; welded pipe is formed from strip or plate and joined along a seam, and may be cold-worked afterwards. Seamless is often selected for higher-pressure, higher-temperature or critical service, and welded for larger diameters and cost-sensitive lines. A seamless pipe is not automatically stronger than every welded pipe: capacity depends on grade, wall thickness, manufacturing quality and the design code, and some codes apply a joint quality factor to welded pipe. Match the choice to the service conditions and the code your project follows.

Stainless Steel Seamless Pipe Applications

• Chemical and petrochemical plants: 304L, 316L, 317L and 904L for corrosive process streams.
• Oil and gas and offshore: duplex and super duplex for chloride-bearing service.
• Power and refining: 321, 347 and the H grades for high-temperature lines.
• Desalination and water treatment: duplex, super duplex and 904L where chloride exposure is high.
• Pharmaceutical, food and beverage: 304L and 316L where cleanliness and finish matter.

Quality Assurance and Testing

Buyers should specify the checks they need on the purchase order. The items below are commonly requested for seamless stainless steel pipe. Which of these Kamal Steels performs in-house, which are done by the mill, and which by an outside laboratory.

• Material identification: heat number, grade, specification and size marked on each pipe, with positive material identification (PMI) available on request.
• Dimensional and visual checks: outside diameter, wall thickness, length, straightness and surface condition checked against the order and the specification's tolerances.
• Specification tests: depending on the standard and order, a hydrostatic or non-destructive electric test, flattening or flaring tests, tensile and hardness tests, and an intergranular corrosion test (for example ASTM A262) or duplex phase checks where specified.
• Traceability: the heat number on the pipe links it to the chemical and mechanical results on the certificate.
• Material Test Certificates: supplied with the consignment. EN 10204 3.1 as standard.
• Third-party inspection: EN 10204 3.2 certificates involve an independent or purchaser's inspector. Whether Kamal Steels arranges inspection by outside agencies on request.

EN 10204 3.1 is a certificate issued by the manufacturer and validated by a representative independent of production; 3.2 adds validation by a purchaser-appointed or authorised inspector. Say which one you need when you enquire.

Packing and Export Packaging

Stainless steel needs protection from damage and from iron contamination during handling. The practices below are typical for export consignments. Kamal Steels' standard packing method and available options.

• End caps: plastic caps on pipe ends to keep out dirt and protect bevels.
• Bundling: pipes bundled with straps, or packed in wooden cases or on pallets for export, with treated wood where the destination requires it.
• Protective wrapping: waterproof or polyethylene wrapping to protect the surface in transit.
• Segregation: stainless pipe kept apart from carbon steel and handled with non-metallic slings or protected contact points.
• Marking: grade, specification, size and schedule, heat number, length and order reference on pipes and on the package.
• Transport: secure loading in container or truck to prevent movement and surface damage.

Supply and How to Request a Quotation

Kamal Steels supplies seamless stainless steel pipes as a manufacturer and stockist. Which sizes are held in stock, which are made to order, typical lead times, minimum order quantity, and export markets served. To get an accurate quotation, send:

• Grade and UNS or EN designation, and the product specification.
• Size: NPS and schedule, or outside diameter and wall thickness in mm.
• Length, delivery condition, finish and end finish.
• Quantity and delivery location.
• Testing and certificate requirements (for example EN 10204 3.1 or 3.2, third-party inspection).
• Packing requirements for export.

HSN Code and Export Classification

Seamless stainless steel pipes and tubes fall under heading 7304 of the Harmonised System, which India's customs tariff extends to eight digits. The correct eight-digit code depends on the product form and use, for example whether the pipe is line pipe or another type, hot- or cold-finished, and its diameter. Tariff listings show 73044900 for other circular-section stainless seamless tubes, but classification should be confirmed with your customs broker or chartered accountant before it appears on an invoice or shipping document.

Frequently Asked Questions

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