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Advantages of cold drawn steel pipe process
Becausecold drawn steel pipeDuring the drawing process, the crystal grains are elongated and broken, and the crystal lattice is "displaced", showing the effect of increased strength and hardness and thinning of the grain density. Moreover, reasonable processes can ensure that the plastic deformation of cold-drawn steel pipes is maintained within a certain range. The comprehensive mechanical properties of cold-drawn steel pipes are higher than those in the hot-rolled state. For example: the tensile strength of 20 steel cold-drawn cylinder tube φ83/φ63 reaches 623N/mm2, while the original hot-rolled pipe is only 410N/mm2. Another example is that the cylinder barrel of the single hydraulic prop cylinder was originally made of 27SiMn steel. Tests have proven that it can be completely replaced by 35 steel cold-drawn steel pipes. Therefore, the mechanical properties of ordinary steel can be improved through the cold-drawing process to replace precious alloy steel.
2. In terms of process, man-hour investment and material investment.
In the past, a few hydraulic cylinder blocks were designed to require heat treatment to improve their performance. For example, the single hydraulic prop cylinder block and the column tube blank were heat treated and tempered for mechanical processing. Cylinder blocks in the machinery industry also have regulations that use 45 steel after normalizing treatment and reprocessing. Cold-drawn steel pipes can simplify the corresponding heat treatment process due to their improved mechanical properties.
3. In terms of quality such as product accuracy and roughness
Looking at the surface roughness from the outside, although traditional boring processing can also meet the requirements, the surface mostly maintains the defects of the hot-rolled state. Precision cold-drawn steel pipes, because the oxide scale is removed from the inner and outer surfaces before drawing, and then drawn and extruded by the inner and outer dies, not only have good surface roughness, but are also smooth, flat and beautiful, which is also a significant feature of it. Secondly, the geometric accuracy and dimensional accuracy of the cold-drawn steel pipe are formed by plastic deformation through extrusion of the inner and outer dies. Since the mold itself is very precise, the accuracy of the cold-drawn steel pipe extruded and deformed by the inner and outer dies is also guaranteed by the mold, and its original geometric deviation is cleared after cold drawing.
To sum up, this kind of high-precision cold-drawn pipe adopts a non-cutting process, which saves labor and materials compared with the traditional process. It has better mechanical properties and higher product precision. The products produced by this process are wear-resistant, durable and have a high service life. It has been adopted by coal mine underground support, and is constantly expanding to the oil production, metallurgical equipment, engineering machinery, and automobile industries.
This article is compiled and published by Baiquan Hydraulics, please indicate the reprinthttp://m.cbtea.cn