Firstly, we'd like to discuss hot-rolled seamless square tubes, which are produced by heating steel billets and then rolling them through multiple passes. This process is simple, with high efficiency, and these square tubes are widely used in the market. Cold-drawn seamless square tubes, on the other hand, are processed from steel billets using the cold-drawing process, resulting in a smoother surface quality and high precision size control. Next, let's talk about extruded seamless square tubes, where steel billets are placed in molds and then shaped through external pressure. While the production process is more complex, the finished product quality is also higher. Lastly, we should mention welded square tubes, which come in various production methods including arc-welded, resistance-welded, gas-welded, and furnace-welded square tubes, further categorized into straight seam and spiral seam types.
News Center Co., Ltd.
