GB/T 3639 高精度冷轧或冷拔无缝钢管 

GB/T 3639 High Precision Cold  Rolling or Cold Drawing Seamless  Steel Pipe

选用知名钢厂10、20、35、45、Q355B等优质钢，经酸洗、精拔轧制生产出的钢管具有精密度高，光洁度好，内外壁无氧化层，钢管可以承受液ti通过的高压，且钢管可以冷弯加工，大口径扩口、缩口、压扁。主要用于汽车油路管、刹车用管、安全气囊管、防撞杆等汽车精密部件和液压设备专用精密钢管。

The steel pipes, sourced from renowned steel producers like 10, 20, 35, 45, and Q355B, go through meticulous processes involving acid pickling and fine-drawn cold rolling. The result is a steel pipe that boasts exceptional precision, characterized by its smooth surface with no oxide scale present, both internally and externally. These pipes are engineered to handle high-pressure fluid transmission without compromise.

Moreover, they can be easily manipulated cold-formed, allowing for tasks such as expanding, reducing, or flattening larger diameters. Primarily, they are employed in the manufacture of precision components for automobiles, such as oil lines, brake lines, airbag inflation tubes, and crash-bar components. They serve as specialized materials for both automotive systems and hydraulic equipment, emphasizing durability and functional sophistication.