High-precision cold drawn pipes are drawn from hot-rolled pipes. The selection of the material, specifications and quality of the hot-rolled pipes directly affects the drawing process and the quality of the finished product. Pay attention to the following points when selecting materials:
1. In the selection of materials, materials with low hardness and good plasticity are generally selected under the condition of ensuring the strength;
2. The specifications of high-precision cold drawn pipes should be selected according to the specifications of the finished product to ensure that its elongation is within a specific range; if the elongation is too small, the strength of the surface of the finished product cannot be guaranteed, and if the elongation is too large, the drawing is difficult to proceed;
3. The surface of the material must not have serious defects such as pits, cracks, cracks, folds, scars, ellipses, etc.;
4. It is better to choose the product that is placed 0.5~2a after hot rolling. It is too short, the surface of high-precision cold drawn pipes is shallow and thin, the time is too long, and the surface rust is too deep, which will lead to insufficient surface pretreatment, thereby affecting The surface quality of the finished product.
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