API Spec 5L and ASTM A53/A53M both cover carbon steel pipe, but they were developed for different product scopes. Neither standard is universally “better.” API 5L is specifically written for steel line pipe used in pipeline transportation systems. ASTM A53/A53M covers black and hot-dip zinc-coated welded and seamless pipe for mechanical and pressure applications and also permits ordinary uses in steam, water, gas, and air lines. The correct choice depends on the governing design code, owner specification, service conditions, required…

API 5L seamless and welded pipe can both be used in pipeline transportation systems when the selected product complies with the applicable specification, design code, and project requirements. A weld seam does not automatically make a pipe weaker, and the absence of a seam does not automatically make a pipe suitable for every critical service. The practical choice depends on size availability, wall thickness, grade, product specification level, toughness, service environment, inspection requirements, quantity, and project economics. LONGMA manufactures round…

API 5L ERW vs LSAW pipe selection is not simply a choice between a cheaper pipe and a stronger pipe. Both manufacturing routes can produce qualified line pipe when the selected grade, product specification level, dimensions, testing plan, and project requirements are correctly specified. The practical decision depends on diameter, wall thickness, design calculations, service environment, order quantity, inspection requirements, and delivery schedule. This guide compares the two welded pipe routes and explains what procurement teams should confirm before issuing…

FBE-coated steel pipe is steel pipe protected with fusion-bonded epoxy, a thermosetting powder coating applied to a prepared and heated steel surface in a controlled plant. The coating may be applied by the pipe manufacturer or an approved coating applicator. The powder melts, flows, and cures into a bonded, continuous film that helps isolate the steel from the surrounding environment. FBE performance depends on more than the coating name. Steel grade, pipe dimensions, surface preparation, powder formulation, application temperature, film…

Structural steel tubes are selected for load-bearing members, frames, towers, trusses, supports, and fabricated structures. A correct purchase specification requires more than a diameter and price: the engineer and buyer should define the structural function, steel grade, product standard, dimensions, manufacturing route, inspection, surface protection, documentation, and delivery conditions. This article focuses on circular hollow sections (CHS) and round welded structural steel pipe. LONGMA manufactures round ERW and LSAW steel pipe; square and rectangular hollow sections and seamless tubes are…

China has a broad steel pipe manufacturing base, but a competitive quotation does not by itself establish that a supplier is suitable for a structural project. Buyers should verify the actual manufacturing facility, round-pipe production range, steel grade, product standard, inspection capability, traceability, surface protection, documentation, and delivery plan before placing an order. This guide focuses on circular hollow sections (CHS) and other round structural steel pipes. Square and rectangular hollow sections are outside the LONGMA manufacturing scope and are…

Large-diameter steel pipe can be cut by mechanical sawing, oxy-fuel, plasma, laser, abrasive waterjet, or purpose-built pipe cutting and beveling equipment. No single method is best for every project. The correct choice depends on pipe material, outside diameter, wall thickness, coating, weld-seam position, required edge quality, production volume, and whether work is performed in a factory or in the field. This guide focuses on round steel pipe. Equipment capacity, cutting parameters, tolerances, and safety controls must be established from the…

Pipeline coating systems can help protect steel water pipelines in two different ways. External coatings limit contact between the steel and the surrounding soil or water, while internal linings separate the steel from the conveyed water. These functions should not be confused: an external coating protects the pipe structure, whereas an internal lining that contacts drinking water must also meet the applicable health and regulatory requirements. No coating makes a pipeline maintenance-free or guarantees a fixed service life. Performance depends…

Fusion-bonded epoxy (FBE) is a thermosetting powder coating used to protect steel pipe from corrosion. The powder is applied to a prepared and heated steel surface, where it melts, flows, and cures into a continuous coating. Reliable performance depends on the complete application process—not on powder selection alone. This guide explains the typical factory FBE pipe coating process, the controls buyers should review, and the information needed when requesting a quotation. Final requirements must always follow the applicable coating standard,…

The answer depends on the tube shape and on which radius is required. For a circular structural hollow section (CHS), the outside radius is one-half of the outside diameter. If wall thickness is known, the inside radius can also be calculated. For square and rectangular hollow sections, “radius” normally means the rounded corner radius, which should be taken from the applicable standard or the manufacturer’s section data rather than assumed from the overall width or height. Radius of a Circular…

Yes. Galvanized steel pipe can eventually rust, but its zinc coating normally delays corrosion of the underlying steel. The coating works as both a barrier and a sacrificial metal. Rust becomes more likely after the zinc is consumed, chemically attacked, or damaged deeply enough to expose steel beyond the protection available from adjacent zinc. How Galvanizing Protects Steel Pipe Barrier Protection A continuous zinc coating separates the steel from oxygen, moisture, and other corrosive agents. During hot-dip galvanizing, iron-zinc alloy…

ASTM A252 Grade 3 steel pipe piling has a specified minimum yield strength of 45,000 psi (310 MPa) and a minimum tensile strength of 66,000 psi (455 MPa). These are minimum material properties, not the allowable load or design capacity of an installed pile. Final pile capacity depends on section geometry, stability, connections, corrosion allowance, installation stresses, soil conditions, and the applicable structural and geotechnical design rules. ASTM A252 Grade 3 Mechanical Properties   Property Grade 3 requirement What it…

The primary distinction between a pipe pile and an H pile lies in their cross-sectional shapes and the methods they use to transfer load through the soil. A pipe pile is a circular steel section that is hollow and can either be open-ended or closed-ended, whereas an H pile is a solid steel section that is hot-rolled and H-shaped. Pipe piles provide options for varying diameter, wall thickness, and concrete fill, whereas H piles are typically effective for end-bearing applications and…

Polishing the galvanized steel pipe is a balancing act of esthetics and protection of the zinc covering. The method entails washing the surface using non-acidic detergents, using fine grit abrasives (400-600 grit) or soft nylon brushes to minimize damage to the galvanized layer, and using specific polishing chemicals developed for zinc surfaces. When properly implemented, these procedures help preserve the corrosion resistance of the pipe, and they provide a smooth, uniform finish for an industrial application where look and long life…

The construction and renewable energy industries today are facing growing demands for structural integrity and environmental responsibility. Structural steel tube products offer high-strength solutions at this critical juncture, helping to meet the carbon-reduction objectives that increasingly shape procurement decisions worldwide. Engineering businesses and fabricators are seeing ever more stringent sustainability reporting requirements, and the materials they choose now will define their competitive standing tomorrow. This guide considers how cold formed welded hollow sections, namely those manufactured to EN 10219, may contribute…