EN10219 S235 S355 ERW Steel pipes are cold-formed welded structural hollow sections manufactured from non-alloy and fine-grain steels. Engineered to meet rigorous European standards, these pipes are available in circular, square, and rectangular profiles, delivering exceptional structural integrity and versatility for modern engineering, construction, and industrial applications.
Products Description
| Product | EN10219 S235 S355 ERW Steel pipe |
| Process | Electrical Resistance Welding |
| Standard | EN10219-1, EN10219-2 |
| Grade | S235, S275, S355... |
| Size Range | OD 1/2"–26"(21.3–660mm) for Round pipes , Sizes10x10~600x600mm for RHS SHS |
| Shape | CHS, RHS, SHS |
| Coating | Bare, black paint, galvanized, unti-rust oil |
Manufacturing Process
The production of EN10219 S235 S355 ERW Steel pipe involves several critical stages:
Raw Material Preparation: Hot-rolled or cold-rolled steel coils or plates are selected based on the desired steel grade.
Cold Forming: The steel strip is passed through a series of rollers to form the desired shape (round, square, or rectangular) at ambient temperature. This process enhances the yield strength through strain hardening .
High-Frequency Welding (ERW/HFW): The edges of the formed profile are heated using high-frequency electric current and fused together under pressure, creating a seamless-like weld joint without filler metal. This method ensures a strong, consistent bond .
Sizing and Straightening: The welded section is sized to achieve precise dimensions and straightened to meet flatness and curvature tolerances .
Cutting and Finishing: Sections are cut to specified lengths. Surface treatments such as black painting, oiling, or galvanization may be applied to prevent corrosion during storage and transport
Characteristics
High Strength & Toughness: Excellent yield and tensile strength with reliable impact resistance, maintaining structural stability under dynamic loads and low-temperature conditions.
Superior Weldability: Clean, uniform weld seams facilitate straightforward fabrication, cutting, drilling, and on-site assembly without compromising structural continuity.
Dimensional Stability: Tight manufacturing tolerances and consistent cross-sectional properties simplify structural engineering calculations and minimize material waste during construction.
Corrosion Resistance: When paired with appropriate surface treatments, the pipes demonstrate long-term durability in humid, coastal, or chemically exposed environments.
Applications
EN10219 S235 S355 ERW Steel pipes are extensively utilized across multiple sectors due to their structural reliability, cost-effectiveness, and ease of integration. Primary applications include:
Structural frameworks, columns, and beams for commercial, industrial, and residential buildings.
Support systems, scaffolding, trusses, and steel framing structures.
Low-pressure fluid transportation pipelines, vessel manufacturing, and chemical processing equipment.
Machinery manufacturing, mining infrastructure, and marine or coastal construction projects
Quality Assurance
Manufacturers adhering to EN10219 standards implement rigorous quality control measures. Products are typically certified by recognized bodies such as SGS, BV, API, and ISO 9001. Each batch undergoes testing for:
Chemical Composition: Ensuring compliance with specified steel grades.
Mechanical Properties: Including tensile strength, yield strength, elongation
Non-Destructive Testing (NDT): Ultrasonic or eddy current testing of weld seams to detect internal defects
contact
Kevin
Tianjin shenzhoutong steel pipe co.,ltd
kevin@tjshenzhoutong.com
Mob/whatsapp/wechat +86 15267768016
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