Q235B Longitudinal Highfrequency Welded Steel Pipe
Q235B Longitudinal High-Frequency Welded Steel Pipe Product Introduction
Q235B longitudinal high-frequency welded steel pipe is made from Q235B carbon structural steel using longitudinal high-frequency resistance welding technology, and then cut into welded steel pipes of the required length. This product utilizes the skin effect and proximity effect of high-frequency current to instantly heat the steel strip edges to a molten state, achieving grain boundary penetration welding under the action of extrusion rollers, forming a continuous and uniform weld structure. Its yield strength is not less than 235MPa, and it features narrow welds, a small heat-affected zone, high forming efficiency, and high dimensional accuracy. It is widely used in low-pressure fluid transportation systems, building structural support, and general machinery manufacturing. This product conforms to GB/T 3091 standard and can be treated with hot-dip galvanizing, epoxy spraying, and other surface anti-corrosion treatments according to the requirements of the service environment.
Mechanical properties
| Performance Indicators | Standard Requirements | Typical Measured Values |
|---|---|---|
| Yield strength (Rp0.2) | ≥ 235 MPa | 255 ~ 310 MPa |
| Tensile strength (Rm) | 375 ~ 500 MPa | 390 ~ 460 MPa |
| Elongation after fracture (A) | ≥ 20% | 25% ~ 35% |
| Flattening test | Compressed to H=2/3D, no cracks found. | Qualified. |
| Weld strength | Not lower than the base material. | Equal to or slightly higher in strength than the base material. |
Surface Treatment of Q235B Longitudinal Welded High-Frequency Welded Steel Pipes
The surface treatment of Q235B longitudinally welded high-frequency welded steel pipes mainly adopts a continuous hot-dip galvanizing process. The process includes pretreatment steps such as alkaline degreasing, hydrochloric acid pickling, and flux immersion, followed by hot-dip galvanizing in a zinc bath at 450℃-460℃. This ultimately forms a complete coating on the surface, consisting of a zinc-iron alloy layer and a pure zinc layer. This treatment ensures that the zinc coating on the steel pipe surface is no less than 275g/㎡ (standard requirement), with uniform thickness and strong adhesion, effectively resisting atmospheric corrosion and electrochemical corrosion, and significantly extending service life. In addition, advanced anti-corrosion treatments such as epoxy resin electrostatic spraying or polyethylene coating can be used as needed. These coatings provide longer-lasting protection for the steel pipes in harsh corrosive environments through a dual mechanism of cathodic protection and physical barrier.
About us
GNEE STEEL Group is primarily engaged in the international steel export trade, with 18 years of experience in this field. Our exported steel pipe products (welded steel pipes, spiral welded pipes, straight seam welded pipes, fluid pipes, galvanized pipes, alloy steel pipes, etc.) are distributed in various countries and regions, and have consistently earned customer satisfaction.
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