Carbon Steel Pipes & Tubes

Carbon steel is an iron-carbon alloy in which carbon is the principal alloying element, with only residual amounts of manganese, silicon, sulphur, and phosphorus. Depending on carbon content, carbon steel is broadly classed as low-carbon/mild steel (up to 0.30% C), medium-carbon (0.30-0.60% C), and high-carbon (above 0.60% C) with low and medium carbon grades forming the bulk of pipe and tube production. Mechanical properties such as tensile strength, yield strength, hardness, and toughness vary directly with carbon content and heat treatment, which is why carbon steel remains one of the most versatile and widely specified piping materials globally.

Carbon steel pipe refers to hollow, round sections produced to a nominal bore (NB) and schedule designation, primarily used to convey liquids, gases, steam, and slurries under pressure. Carbon steel tube, by contrast, is manufactured to a precise outside diameter (OD) and wall thickness (WT), and is generally selected for structural, mechanical, and heat-transfer applications such as boiler tubes, heat-exchanger tubes, condenser tubes, and hydraulic/instrumentation tubing, where tighter dimensional tolerance and surface finish are required.

Carbon steel is favoured across industries because it offers a dependable combination of strength, weldability, machinability, and affordability compared with alloy and stainless steels making it the default material choice wherever the service environment is not aggressively corrosive.

Seamless Carbon Steel Pipe

Manufactured without a weld seam by piercing and rolling a heated solid billet. The absence of a longitudinal seam gives uniform mechanical properties in all directions, making seamless pipe the preferred choice for high-pressure, high-temperature, and critical service in refineries, power plants, and chemical processing.

ERW Carbon Steel Pipe (Electric Resistance Welded)

Produced by cold-forming steel strip or coil into a cylindrical shape and fusing the longitudinal edges using high-frequency electric resistance welding, without filler metal. ERW pipe is a cost-effective option for general piping, water lines, structural applications, and lower-pressure process systems, typically available from 1/2″ NB to 24″ NB.

LSAW Carbon Steel Pipe (Longitudinal Submerged Arc Welded)

Formed from steel plate and welded longitudinally using submerged arc welding. Best suited for large-diameter, thick-wall applications such as oil and gas transmission, offshore pipelines, and piling, generally available from 16″ NB to 100″ NB.

SSAW Carbon Steel Pipe (Spiral Submerged Arc Welded)

Manufactured by spirally forming steel strip and submerged-arc welding both the inner and outer seams. Commonly used for large-diameter water transmission lines, piling, and structural applications where pressure requirements are moderate.

• Seamless Pipe & Tube: A heated, solid round billet is pierced with a mandrel to form a hollow shell, then rolled and sized to the required OD and wall thickness. No longitudinal seam is present.
• ERW Pipe & Tube: Flat steel strip or coil is cold-formed into a cylindrical shape and the longitudinal edges are fused by high-frequency electric resistance welding. The weld seam is typically heat-treated to normalize the microstructure before sizing and cutting.
• LSAW / SSAW Pipe: For larger diameters, plate is formed and welded using submerged arc welding — longitudinally (LSAW) or helically (SSAW/spiral) — to produce large-diameter pipe for cross-country pipelines, water transmission, and structural piling.
• Cold Drawing (Tubes): Seamless hollows are cold-drawn through a die to achieve tight dimensional tolerance, superior surface finish, and enhanced mechanical properties, followed by heat treatment in a controlled-atmosphere furnace.
• Heat Treatment & Finishing: Pipes and tubes are supplied in as-rolled, normalized, or annealed condition as required by the specification, followed by straightening, end-facing/bevelling, hydrostatic or NDT testing, and marking. 

For critical high-pressure, high-temperature service refineries, power plants, boilers, seamless carbon steel pipe is generally specified. For large-diameter transmission lines, structural applications, and cost-sensitive projects, welded carbon steel pipe is the standard choice. 

Full dimensional data for Sch 20, 30, 60, 100, 120, 140 and weight per metre is available on request.

Third-party inspection and witness testing by SGS, Bureau Veritas, TÜV, Lloyd’s Register, IRS, or CEIL can be arranged on request. All material is supplied with EN 10204 3.1 mill test certificates traceable to heat/lot number, and IBR Form III-D where required.

Packaging

• Plastic or steel end caps on each pipe/tube bore
• Black varnish or rust-preventive oil on external surface
• Bundled with steel strapping in hexagonal or square bundles
• Wooden crating or dunnage for sea freight
• FBE, 3LPE, or transparent film wrapping available on request
• Containerized (FCL/LCL) or break-bulk loading as required

Marking — each pipe/tube is stencilled or ink-stamped with: manufacturer name, standard, grade, size (NPS × schedule or OD × WT), heat/lot number, length, test pressure, and inspection mark.

Export Documentation — commercial invoice & packing list, EN 10204 3.1 mill test certificate, certificate of origin, IBR Form III-D (where applicable), third-party inspection release note, fumigation certificate, bill of lading, MSDS.

• Oil & gas exploration, gathering, and cross-country transmission pipelines
• Refinery and petrochemical process piping
• Power plant boiler, superheater, and economizer tubing
• Heat exchangers, condensers, and cooling systems
• Water and steam distribution networks
• Structural framing, piling, and construction hollow sections
• Shipbuilding and offshore platform piping
• Fertilizer, sugar, cement, and chemical processing plants
• Automotive and hydraulic tubing
• Fire-fighting and plumbing systems

• Wide Grade & Size Availability: Extensive stock across seamless and welded carbon steel pipes and tubes in all major grades and dimensional standards.
• Complete Traceability: Every consignment is supplied with EN 10204 3.1 mill test certificates and heat-number traceability, plus IBR documentation where required.
• Third-Party Inspection: Inspection and witness testing coordinated through SGS, Bureau Veritas, TÜV, Lloyd’s Register, and other approved agencies.
• Custom Fabrication: Cutting, bevelling, threading, and length customization available per project drawings.
• Global Export Experience: Established logistics network with export documentation, packing, and shipping support to more than 80 countries.
• Responsive Technical Support: Dedicated engineers assist with grade selection, equivalence cross-referencing, and specification compliance.
• Competitive, Transparent Pricing: Direct-from-stock and mill-direct sourcing keeps pricing competitive without compromising quality.

Jade Alloys supplies Carbon Steel pipes and tubes worldwide, with sales representation and stocking support across every major industrial region.