方管的使用过程中难免会出现一些问题，这些问题如果不及时进行解决就会造成使用质量的降低，下面来讲讲济南方管脆性断裂的多种原因。

It is inevitable that there will be some problems in the use of square tubes. If these problems are not solved in time, the quality of use will be reduced. Here are several reasons for brittle fracture of Jinan square tubes.

方管酸洗工艺选用的酸洗液一般为多种酸的混合物，主要有硫酸、硝酸和氢氟酸等，这些混合酸的腐蚀性很强且具有很强的氧化性，腐蚀介质的温度也比较高，这些对防腐材料的耐蚀性能提出了很高的要求。

The pickling solution selected for square tube pickling process is generally a mixture of various acids, mainly including sulfuric acid, nitric acid and hydrofluoric acid. These mixed acids have strong corrosivity and strong oxidation, and the temperature of corrosive medium is relatively high, which puts forward high requirements for corrosion resistance of anti-corrosion materials.

方管适用的防腐材料有不少，无缝方管其中好的是环氧树脂及其改性树脂。方管酸洗原理是使用酸性液体，去除预处理后方管表面的氧化物表皮，去除表面的金属离子，使其具有美好的光洁度。

There are many anti-corrosion materials applicable to square pipes, among which epoxy resin and its modified resin are the best. The principle of square tube pickling is to use acidic liquid to remove the oxide skin on the surface of the square tube after pretreatment, remove the metal ions on the surface, and make it have a good finish.

酸洗的材料形态有带洗、管洗、板洗、线洗等，由于热轧管坯存在裂纹等缺陷或高精度冷拔管被制成油缸后，在使用过程中发生的断裂，几乎没有塑性变形发生，一般均为脆性断裂。

The material forms of pickling include strip washing, pipe washing, plate washing, line washing, etc. The cracks and other defects of hot rolled tube blanks or the fractures of high-precision cold drawn tubes after being made into oil cylinders occur in the use process, almost no plastic deformation occurs, and they are generally brittle fractures.

脆性断裂是由多种原因引起的。如：晶界上有析出物时，不管其强度比基体强度强或弱，皆是产生裂纹的原因；晶界上夹杂物的偏析也是断裂的原因；另外，即使在远远小于屈服极限的交变载荷作用下，也会引起发生疲劳断裂现象。

Brittle fracture is caused by many reasons. For example, when there are precipitates on the grain boundary, whether its strength is stronger or weaker than that of the matrix, it is the cause of cracks; The segregation of inclusions on the grain boundary is also the cause of fracture; In addition, even under the action of alternating load which is far less than the yield limit, fatigue fracture will occur.

在高强度金属材料中发生的低应力脆性断裂的过程中，材料组织远非均匀的、各向同性的。方管合理使用手段对生锈管件进行清理时保证管件长时间的服务于生产，创造更多的生产效益。

In the process of low stress brittle fracture in high strength metal materials, the material structure is far from homogeneous and isotropic. The reasonable use of square pipes ensures that the rusty pipe fittings can serve the production for a long time and create more production benefits.

造成方管脆性断裂的多种原因就讲解到这里了，您对此有怎样的疑惑或者需求可以随时来我们网站http://www.hhqhq.com进行咨询！

The reasons for brittle fracture of square tubes are explained here. You can come to our website at any time if you have any doubts or needs http://www.hhqhq.com Consult!