Heat and cold tubes can be distinguished by:
Observe the markings on the surface of the steel pipe. The heat pipe is usually marked with the word "HT" on the outer wall of the steel pipe, indicating the use of thermal processing technology;The cold pipe will be marked with the word "C" on the outer wall of the steel pipe or not marked, indicating the use of cold processing technology.
Observe the appearance and properties of the steel pipe. The surface of the heat tube is rough and uneven, and sometimes there is even oxide, because the billet needs to be heated during the production process, deformed and cooled quickly, resulting in a tough, plastic steel tube. The surface of the cold tube is smooth and flat, because the cold working technology is used in the production process, and the billet is not heated and processed directly, so there is no oxide on the surface. Due to the need for heating during processing, the heat tube has high toughness and plasticity, and can withstand external forces such as bending and impact. Although the strength of the cold tube is higher, it is slightly inferior to the heat tube in terms of resistance to external forces because the cold processing will lead to grain refinement, which will reduce its toughness and plasticity.
The significance of distinguishing between heat and cold tubes is that they are used in different occasions and purposes. The heat tube is suitable for occasions that need to withstand heavy impact or deformation, such as machinery manufacturing, construction engineering, etc.;The cooling tube is suitable for occasions that require high precision and smooth surface, such as electrical appliances, automobiles, etc.
To sum up, by observing the marking and appearance of the surface of the steel pipe, and understanding the properties and uses of the two, it is easy to judge the processing method and use of the heat pipe and the cold pipe, and the selection of appropriate steel pipe materials can improve the production efficiency and quality, and save the cost.
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