冷拔钢管平常在进行贮存的时候会发生氧化，导致生锈。但是随着科学技术的发展，对冷拔钢管的贮存条件越来越好，那么防止抗氧化技术也发展的科学了。现在我们贮存产品，一般是将冷拔钢管放到一个棚子里，这样在其表面撒上一些含有氯化钠的粉末，这样是为了与外界的锈迹元素进行中和，但是必须注意的是氯化钠粉末要隔一段时间就要进行重撒一遍。

Cold-drawn steel pipes are usually oxidized and rusted during storage. However, with the development of science and technology, the storage conditions of cold-drawn steel tubes are getting better and better, so the anti-oxidation technology has also developed. Now we store products, usually cold-drawn steel pipe in a shed, so that some powder containing sodium chloride is sprayed on its surface, so as to neutralize the rust elements outside, but it must be noted that sodium chloride powder should be re-sprayed at intervals.

如何处理冷拔钢管因内壁氧化皮脱落而造成的堵塞问题首先采用约80%左右炉管内径大小的钢丝绳对内部来回疏通。将管子内壁上的氧化皮捅掉、将堵塞炉管的氧化皮捅穿:钢丝绳疏通完成后，再利用高压水枪(泵出口压力在80MPa左右)，对每根内壁进行不间断地冲洗.冲洗完成后再利用内窥镜对每根管子进行检查。

How to deal with the blockage problem of cold drawn steel pipe caused by the falling off of oxide scale on the inner wall? Firstly, the steel wire rope of about 80% of the inner diameter of the furnace tube is used to dredge the inside back and forth. Punch the oxide scales off the inner wall of the tube and pierce the oxide scales blocking the furnace tube. After the wire rope is dredged, the inner wall of each tube is washed continuously with a high pressure water gun (the outlet pressure of the pump is about 80 MPa). After the washing is completed, each tube is inspected with an endoscope.

保证管子内部畅通:根据冲洗结束后内窥镜检查情况，对冷拔钢管进行第二次酸洗〔包墙过热器由于结构原因.未能对其进行酸洗)，而此前锅炉安装结束后的次酸洗.由于对垂直水冷壁管内部氧化物情况不明.且所取样管为正常合格的螺旋水冷壁样管.因此采用的是对锈类、垢类杂质有效.但对高温氧化皮效果不是好的EDTA清洗工艺。针对炉管发生泄露后所发现的悄况.我们应采用了复合酸(催化柠檬酸)为介质.井设计了”两步清洗法”经过两次强效的化学清洗.终使得内壁氧化皮全部清洗干净。

Make sure the inside of the tube is unblocked: According to the endoscopy examination after washing, the cold-drawn steel pipe is pickled for the second time [because of structural reasons, the wall superheater can not be pickled], and the hypo-pickling after the installation of the boiler before. Because of the unclear internal oxide condition of the vertical water-cooled wall pipe, and the sampled tube is normally qualified. Therefore, EDTA cleaning process is effective for rust and scale impurities, but not good for high temperature oxide skin. In view of the quiet situation found after the leakage of the furnace tube, we should use compound acid (catalytic citric acid) as the medium. Well design "two-step cleaning method" after two strong chemical cleaning, finally make the inner oxide scale clean.