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镀锌管的分类与使用用途

来源:http://www.jnxxjm.com/

【 发布于:2018-09-15 14:06:32 】


一、镀锌管的分类

Classification of galvanized pipes

镀锌钢管分冷镀管、热镀管,前者已被禁用,后者还被国家提倡暂时能用。

Galvanized steel pipes are separately cold plated and hot plated. The former has been banned and the latter is temporarily promoted by the state.

【1】热镀锌管,是使熔融金属与铁基体反应而产生合金层,从而使基体和镀层二者相结合。热镀锌是先将钢管进行酸洗,为了去除钢管表面的氧化铁,酸洗后,通过氯化铵或氯化锌水溶液或氯化铵和氯化锌混合水溶液槽中进行清洗,然后送入热浸镀槽中。热镀锌具有镀层均匀,附着力强,使用寿命长等优点。北方大部分工艺采用镀锌带直接卷管补锌工艺。

[1] Hot-dip galvanized tube is a kind of alloy layer formed by the reaction of molten metal and iron matrix, so that the matrix and the coating are combined. Hot-dip galvanizing is to carry out acid cleaning of steel pipes, in order to remove iron oxide on the surface of steel pipes, after acid cleaning, through ammonium chloride or zinc chloride solution or ammonium chloride and zinc chloride mixed solution tank for cleaning, and then into the hot-dip bath. Hot dip galvanizing has the advantages of uniform coating, strong adhesion and long service life. In the north, zinc plating process is used in most of the processes.

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【2】冷镀锌管,冷镀锌就是电镀锌,镀锌量很少,只有10-50g/m2,其本身的耐腐蚀性比热镀锌管相差很多。正规的镀锌管生产厂家,为了保证质量,大多不采用电镀锌(冷镀)。只有那些规模小、设备陈旧的小企业采用电镀锌,当然他们的价格也相对便宜一些。今后不准用冷镀锌管作水、煤气管。

[2] Cold-galvanized pipes are electroplated zinc with a very small amount of zinc, only 10-50g/m2. The corrosion resistance of cold-galvanized pipes is much different from that of hot-galvanized pipes. Regular galvanized pipe manufacturers, in order to ensure quality, most of them do not use zinc plating (Leng Du). Only small businesses with obsolete equipment adopt galvanizing, and their prices are relatively cheap. Cold galvanized pipes shall not be used as water and gas pipes in the future.

【3】热镀锌钢管,钢管基体与熔融的镀液发生复杂的物理、化学反应,形成耐腐蚀的结构紧密的锌一铁合金层。合金层与纯锌层、钢管基体融为一体。故其耐腐蚀能力强。热镀锌钢管经过20世纪60~70年代的发展,产品质量得到了很大的提高,1981~1989年连续被评为冶金部优质产品及国家银质奖等,产量也连续多年增长,1993年产量为40多万吨,1999年产量为60多万吨,并出口东南亚、非洲、美国、日本、德国等国家和地区。热镀锌管多用作输水管和煤气管,常用规格为+12.5~+102 mm。90年代以后,由于国家对环境保护的重视,对高污染企业控制越来越严,热镀锌管在生产中产生的“三废”难以解决,再加上不锈钢焊管、PVC管和复合管等管材的快速发展,以及国家提倡推广应用化学建材,限制使用镀锌钢管,使得热镀锌焊管的发展受到了很大的约束和限制,热镀锌焊管后来发展缓慢。

[3] In hot-dip galvanized steel pipes, complex physical and chemical reactions take place between the substrate and the molten plating solution, resulting in a zinc-iron alloy layer with a close corrosion resistance structure. The alloy layer is integrated with the pure zinc layer and the steel tube substrate. Therefore, its corrosion resistance is strong. The quality of hot-dip galvanized steel pipes has been greatly improved after the development in the 1960s and 1970s. From 1981 to 1989, they were awarded the Ministry of Metallurgy High-quality products and the National Silver Award. The output of hot-dip galvanized steel pipes has also increased for many years. The output of hot-dip galvanized steel pipes in 1993 was more than 400,000 tons, and in 1999 it was more than 600,000 tons, and exported to Southeast Asia, Africa Germany and other countries and regions. Hot dip galvanized pipes are mostly used for water pipes and gas pipes. The common specifications are +12.5 to +102 mm. Since the 1990s, due to the state's emphasis on environmental protection, the control of high-pollution enterprises has become increasingly stringent, the "three wastes" produced in the production of hot-dip galvanized pipes are difficult to solve, coupled with the rapid development of stainless steel welded pipes, PVC pipes and composite pipes, as well as the promotion and application of chemical building materials by the state to restrict the use of galvanized pipes. As a result, the development of hot-dip galvanized welded pipe has been greatly constrained and restricted, and the development of hot-dip galvanized welded pipe has been slow.

【4】冷镀锌钢管,锌层是电镀层,锌层与钢管基体独立分层。锌层较薄,锌层简单附着在钢管基体上,容易脱落。故其耐腐蚀性能差。在新建住宅中,禁止使用冷镀锌钢管作为给水管。

[4] cold galvanized steel pipe, zinc layer is electroplating layer, zinc layer and steel pipe matrix separate layer. The zinc layer is thin, and the zinc layer is simply attached to the steel tube substrate, so it is easy to fall off. Therefore, its corrosion resistance is poor. In new buildings, cold galvanized steel pipes are not allowed to be used as water pipes.

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二、镀锌管的相关利用

Related uses of galvanized pipes

为提高钢管的耐腐蚀性能,对一般钢管进行镀锌。镀锌钢管分热镀锌和电镀锌两种,热镀锌镀锌层厚,电镀锌成本低,表面不是很光滑。吹氧焊管:用作炼钢吹氧用管,一般用小口径的焊接钢管,规格由3/8-2寸八种。用08、10、15、20或者195-Q235的钢带制作成的,为了防腐蚀,有的要进行有效渗铝处理。

In order to improve the corrosion resistance of steel pipes, galvanized steel pipes are commonly used. Galvanized steel pipe can be divided into hot-dip galvanizing and galvanizing. The hot-dip galvanizing layer is thick, the galvanizing cost is low, and the surface is not very smooth. Oxygen-blowing welded pipe: Used as steel-making oxygen-blowing pipe, generally with small-diameter welded pipe, specifications from 3/8-2 inch eight kinds. Made of 08, 10, 15, 20 or 195-Q235 steel strips, in order to prevent corrosion, some of the effective aluminizing treatment.

老房子大部分是用的都是镀锌管,现在煤气、暖气用的那种铁管也是镀锌管,镀锌管作为水管,使用几年后,管内产生大量锈垢,流出的黄水不仅污染洁具,而且夹杂着不光滑内壁滋生的细菌,锈蚀造成水中重金属含量过高,严重危害人体的健康。六七十年代,国际上发达国家开始开发新型管材,并陆续禁用镀锌管。中国建设部等四部委也发文明确从二000年起禁用镀锌管,目前新建小区的冷水管已经很少使用镀锌管了,有些小区的热水管使用的是镀锌管。

Most of the old houses used galvanized pipes. Now the kind of iron pipes used for gas and heating are also galvanized. Galvanized pipes are used as water pipes. After a few years of use, a lot of rust and dirt are produced in the pipes. The yellow water not only pollutes the sanitary ware, but also contains bacteria that grow on the unsmooth inner walls. The rust causes the heavy metal content in the water to be too high. Seriously endangering human health. In 60s and 70s, the developed countries began to develop new types of pipes and banned galvanized pipes one after another. Four ministries and commissions, such as the Ministry of Construction, have been civilized in banning galvanized pipes since 2000. At present, galvanized pipes are seldom used in cold water pipes in new residential areas, and galvanized pipes are used in hot water pipes in some residential areas.


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