Selecting an appropriate AS/NZS 1163 structural hollow section grade is important for design compliance, fabrication and procurement. This guide compares C250, C350 and C450, explains impact-toughness designations and outlines the checks needed when choosing a circular hollow section for structural applications. What Is an AS 1163 Hollow Section? Definition and Scope AS/NZS 1163 specifies requirements for cold-formed structural steel hollow sections. The standard covers circular (CHS), square (SHS) and rectangular (RHS) sections. Product conformity, chemical composition, mechanical properties, dimensions and…

ASTM A53/A53M covers both black and hot-dip zinc-coated carbon steel pipe. ASTM A53 pipe is therefore not necessarily galvanized: the required finish must be specified in the purchase order. This guide explains the available pipe types and grades, the role of zinc coating, and the checks buyers should make for threads, pressure design and documentation. What Is ASTM A53 Steel Pipe? ASTM A53 Steel Pipe Definition and Scope ASTM A53/A53M specifies black and hot-dip zinc-coated steel pipe in seamless and…

S235JR is generally considered weldable because of its relatively low carbon content. Common processes include manual metal arc (MMA), gas metal arc (MAG/MIG), gas tungsten arc (TIG), and submerged arc welding. For cold-formed welded circular hollow sections specified to EN 10219-1, the corresponding designation is S235JRH, not S235JR. Weldability still depends on actual chemical composition, wall thickness, joint restraint, hydrogen control and the qualified welding procedure. This guide explains the practical checks before fabrication or purchasing. What Makes S235JR Weldable?…

Fusion-bonded epoxy (FBE) and three-layer polyethylene (3LPE) are established corrosion-protection systems for steel pipelines. They do not work in exactly the same way. Single-layer FBE provides a bonded epoxy barrier, while 3LPE combines an epoxy primer, an adhesive layer and a polyethylene outer layer. Selecting between them requires attention to operating temperature, handling conditions, soil environment, cathodic protection, field joints and the project's coating specification. What Are FBE and 3LPE Coatings? FBE is a thermosetting epoxy powder coating applied to…

Cold-formed circular hollow sections (CHS) are used in structural frames, trusses, columns, equipment supports and other engineering applications. One common manufacturing route starts with steel strip, forms it into a circular shape at ambient temperature and joins the longitudinal edges using electric resistance welding (ERW). The finished tube is sized, cut, inspected and identified before delivery. This guide explains that ERW process and the technical checks buyers should make when specifying cold-formed structural steel pipe. What Is a Cold-Formed Hollow…

Buying AS/NZS 1163 C350 circular hollow sections (CHS) from China requires more than comparing prices per tonne. The purchaser must confirm the steel grade, dimensions, mechanical test results, documentation and delivery terms against the project's specification. A clear request for quotation helps a manufacturer establish whether the required product can be supplied and tested. This guide focuses on C350 circular sections, supplier assessment and export documentation for structural projects. What Is AS/NZS 1163 C350 CHS? AS/NZS 1163 specifies requirements for…

Yes. Fusion-bonded epoxy (FBE) is widely used to protect steel pipes against corrosion in oil and gas transportation, water infrastructure and selected industrial applications. Its suitability depends on the steel substrate, operating temperature, transported medium, installation environment and coating specification. FBE is a coating system rather than a pipe material grade, and it does not increase the steel pipe's structural strength. This guide explains how it is applied, how to select the relevant standard and what buyers should inspect before…

Cold-formed hollow sections are structural steel products shaped without a final hot-forming operation. Their dimensional consistency, range of section shapes and suitability for fabricated steel structures make them important in construction and industrial engineering. For LONGMA customers, the relevant products are round welded steel pipes and circular hollow sections (CHS). Although structural standards may also cover square and rectangular hollow sections, those profiles should not be presented as part of LONGMA's round-pipe manufacturing range. This guide explains the main characteristics…

AS/NZS 1163 C350 is a grade of cold-formed structural steel hollow section used in construction and infrastructure. For buyers of circular hollow sections (CHS), the key questions concern minimum mechanical properties, product dimensions, impact requirements and documentary evidence of compliance. A grade name alone is not enough to approve material for a project. The purchase specification should identify the applicable edition of AS/NZS 1163, the section shape, dimensions, grade designation and any additional project requirements. This guide focuses on the…

Line pipe is pipe manufactured for transporting fluids through pipeline systems. In the oil and gas industry, it carries crude oil, natural gas and other specified fluids between production, processing, storage and delivery facilities. Steel line pipe is commonly supplied to API Specification 5L or another project-approved standard. Choosing the correct line pipe requires more than selecting a diameter: material grade, product specification level, manufacturing route, toughness, welding, corrosion control and inspection must suit the actual design conditions. What Line…

The pipe used in a gas pipeline depends on whether the system is a long-distance high-pressure transmission line, a gathering line, a local distribution main or a service connection. Carbon steel line pipe manufactured to API 5L is widely used for transmission. Polyethylene pipe is also used in permitted gas distribution networks, while specialist metallic materials may be selected for corrosive or unusual service conditions. There is no single pipe material suitable for every gas pipeline. Selection must follow the…

Galvanized steel pipe is steel pipe protected by a zinc coating. It is commonly selected for fencing, handrails, agricultural structures, exposed utility lines, building services and other applications where the strength of steel and resistance to atmospheric corrosion are both important. Whether a galvanized pipe is suitable for carrying water or another fluid depends on the underlying pipe specification, system design, operating conditions and local requirements—not simply on the presence of zinc. This guide explains practical uses, manufacturing methods, coating…

The Direct Answer: CC Refers to a Specific Plate Family In ASTM A671/A671M, the CC prefix identifies a family of electric-fusion-welded pipe grades made from plain carbon, killed, fine-grain pressure-vessel-quality steel plate specified by ASTM A516/A516M. The suffix number identifies the corresponding ASTM A516 plate grade: CC60 uses Grade 60 plate, CC65 uses Grade 65 plate, and CC70 uses Grade 70 plate. The complete ASTM A671 designation also needs a separate pipe Class, such as CC65 Class 22. CC65 is…

What EFW Steel Pipe Means Electric-fusion-welded (EFW) steel pipe is produced from steel plate formed into a cylindrical shape and joined by a fusion-welded longitudinal seam. The exact production and inspection requirements depend on the ordered product specification. EFW describes a manufacturing category; it is not a material grade, pressure rating or guarantee of performance. EFW should be distinguished from electric-resistance-welded (ERW) pipe, in which the longitudinal edges are joined by resistance heating. Longitudinal submerged arc welding (LSAW) describes a…

API 5L X80 (L555) is a high-strength line-pipe grade with a specified minimum yield strength of approximately 555 MPa (80 ksi). Its strength can be useful in high-pressure transmission design, but a strength designation does not establish resistance to hydrogen sulfide (H₂S)-related cracking. X80 should not be described as routinely qualified for sour service under API 5L Annex H. API documentation identifies grades B through X70 in Annex H Table H.1; X80 is not among those listed grades. Consequently, specifying…