清洗的作用是对方管表面残留的酸性物质及其它杂物进行清洗，通过钝化处理获得良好的清洗效果。要考虑到清洗的热水温度多少度以及其他方面的事项，下面来简单讲讲吧。
The function of cleaning is to clean the remaining acidic substances and other sundries on the surface of the square pipe, and good cleaning effect can be obtained through passivation treatment. To consider the temperature of hot water for cleaning and other matters, let's talk about it briefly.
冷水洗槽要经常保持满流，高压水要不停地冲洗，冷拔异型钢管生产加工，水压应保持在0.5MPa以上。在上述条件下冷水中酸的质量浓度不得超过0.1g/L，否则酸洗后洗冷拔无缝管容易锈蚀。 每天和晚上测试冷水中酸的质量浓度。热水槽的热水温度要在95度以上，热水中不应有酸质，以防方管锈蚀。
The cold water washing tank should always be kept full flow, and the high-pressure water should be continuously washed. The water pressure should be kept above 0.5MPa for the production and processing of cold drawn special-shaped steel pipes. Under the above conditions, the mass concentration of acid in cold water shall not exceed 0.1g/l, otherwise the cold drawn seamless pipe after pickling is easy to rust. Test the mass concentration of acid in cold water every day and at night. The hot water temperature of the hot water tank should be above 95 ℃, and there should be no acid in the hot water to prevent the square pipe from rusting.
热水槽出口的一对挤水胶辊要压紧，保证方管表面的水分。在连续酸洗机组里，酸洗后方管进行涂油，使方管在轧制前存放期间（10天左右）不生锈。钝化是使酸洗后的方管表面形成钝化膜，提高抗环境腐蚀能力，一般保证方管在2~3天内不再生锈。
A pair of squeeze rubber rollers at the outlet of the hot water tank shall be pressed tightly to ensure the moisture on the surface of the square tube. In the continuous pickling unit, the square tube is oiled after pickling, so that the square tube will not rust during the storage period (about 10 days) before rolling. Passivation is to form a passivation film on the surface of the pickled square tube, improve the ability to resist environmental corrosion, and generally ensure that the square tube will not rust within 2-3 days.
此外方管之所以可以被大家喜爱而且被大量的使用，是因为方管本身拥有很多的优点吗，正是这些优点让方管成为了我们生活中的“常客”。以前使用的材料很普通，也是很容易就生锈，使用时间往往都不会很长，但是现在使用的方管，这种方管经过防腐蚀的处理，就不会很容易生锈。使用的时间也会很长。
In addition, the reason why square tubes can be loved and widely used is because square tubes have many advantages. It is these advantages that make square tubes become "regular customers" in our life. In the past, the materials used were very common and easy to rust, and the use time was often not very long, but now the square tube used, after anti-corrosion treatment, this square tube will not rust easily. It will take a long time to use.
方管的重强度比其它材料稍高，很少淬火，无回火脆性。冷变形塑性高、一般供弯曲、压延、弯边和锤拱等加工，电弧焊和接触焊的焊接性能好，气焊时厚度小，外形要求严格或形状复杂的制件上易发生裂纹。切削加工性冷拔或正火状态较退火状态好、一般用于制造受力不大而韧性要求高的。
The heavy strength of square tube is slightly higher than that of other materials, with little quenching and no tempering brittleness. Cold deformation has high plasticity. It is generally used for bending, calendering, bending and hammer arch processing. Electric arc welding and contact welding have good welding performance. During gas welding, cracks are easy to occur on parts with small thickness, strict shape requirements or complex shape. The machinability of cold drawing or normalizing state is better than that of annealing state. It is generally used for manufacturing with low stress and high toughness requirements.
济南方管适用于工程、煤矿、纺织量，当然方管的每一个优点都会有使用的领域，就像方管重量很轻，就被大量的使用在制造零件，像自行车的车架就是使用的方管。方管的优点远远不止这些，也正是这些优点让方管可以大量的使用，也给我们的生活提供着很多的便利。同时也让方管厂家得到了丰富的收益。
Jinan square tube is suitable for engineering, coal mining and textile production. Of course, every advantage of square tube will be used in the field. Just as square tube is very light, it is widely used in manufacturing parts, such as the frame of bicycle. The advantages of square tube are far more than these. It is these advantages that make square tube can be used in a large number of ways, and also provide a lot of convenience to our life. At the same time, square tube manufacturers have also received rich benefits.
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