EN 10219 S235JRH circular hollow sections (CHS) are available in multiple outside-diameter and nominal-wall combinations. In commercial inquiries, walls such as 3, 4, 5, 6, 8, 10 and 12.5 mm are useful starting points, but they are not a universal stock list or a wall-thickness range guaranteed by EN 10219. Actual availability depends on outside diameter, manufacturing capability, length and order quantity. S235JRH Grade and Standard S235JRH is a structural hollow-section steel designation under EN 10219-1. S235JR is a related…

The theoretical mass of a circular hollow section (CHS) depends on its outside diameter, nominal wall thickness and steel density. For carbon steel with an assumed density of 7,850 kg/m³, a convenient formula is W = 0.02466 × t × (D − t) kg/m, where D and t are in millimeters. For example, a 168.3 × 6.3 mm CHS has a theoretical mass of approximately 25.17 kg/m, or 151.0 kg for a 6 m length. CHS Dimensions and Weight A…

ASTM A53/A53M does not identify one fixed pipe schedule. It specifies requirements for black and hot-dip zinc-coated welded and seamless steel pipe. Nominal pipe size (NPS), wall thickness or schedule, grade and manufacturing type must be stated separately. Schedule 40 and Schedule 80 are frequently requested, but availability and compliance must be checked for each size and product type. ASTM A53 and Pipe Schedule ASTM A53/A53M covers product requirements such as manufacturing method, chemical composition, mechanical properties, testing and marking.…

Cold forming and hot forming describe how steel is shaped at different temperatures. The distinction can influence dimensional control, residual stress, microstructure, fabrication, and the applicable product standard. Neither process is automatically stronger or more suitable for every project. This guide compares typical production routes, engineering considerations, and the documents buyers should review. Cold-Formed vs Hot-Formed Pipe Cold forming shapes steel at temperatures below its recrystallization range, often near ambient temperature. For welded round hollow sections, steel strip or plate…

Circular hollow sections (CHS) are specified by outside diameter (OD) and wall thickness (t), usually in millimetres. There is no single worldwide CHS size chart: available dimensions depend on the applicable product standard and manufacturer. The sizes in this article are illustrative combinations, not the complete dimensional range permitted by EN 10219. LONGMA supplies ERW and LSAW round steel pipe; confirm the required grade, manufacturing route, tolerances, and availability before ordering. Circular Hollow Sections Explained Definition and Common Uses A…

ASTM A53/A53M covers black and hot-dip galvanized carbon steel pipe in two grades, Grade A and Grade B, and three manufacturing types: Type E (electric-resistance welded), Type S (seamless), and Type F (furnace-butt welded). Understanding the distinction between grade, manufacturing type, dimensions, and testing requirements helps buyers specify pipe for construction, mechanical, water, and fire-protection applications where the relevant design code permits its use. ASTM A53 Grades and Types ASTM A53/A53M is a product specification for black and hot-dip zinc-coated…

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…