方管的使用過程中難免會出現(xiàn)一些問題，這些問題如果不及時進(jìn)行解決就會造成使用質(zhì)量的降低，下面來講講濟(jì)南方管脆性斷裂的多種原因。

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.

方管酸洗工藝選用的酸洗液一般為多種酸的混合物，主要有硫酸、硝酸和氫氟酸等，這些混合酸的腐蝕性很強(qiáng)且具有很強(qiáng)的氧化性，腐蝕介質(zhì)的溫度也比較高，這些對防腐材料的耐蝕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.

方管適用的防腐材料有不少，無縫方管其中好的是環(huán)氧樹脂及其改性樹脂。方管酸洗原理是使用酸性液體，去除預(yù)處理后方管表面的氧化物表皮，去除表面的金屬離子，使其具有美好的光潔度。

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.

酸洗的材料形態(tài)有帶洗、管洗、板洗、線洗等，由于熱軋管坯存在裂紋等缺陷或高精度冷拔管被制成油缸后，在使用過程中發(fā)生的斷裂，幾乎沒有塑性變形發(fā)生，一般均為脆性斷裂。

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.

脆性斷裂是由多種原因引起的。如：晶界上有析出物時，不管其強(qiáng)度比基體強(qiáng)度強(qiáng)或弱，皆是產(chǎn)生裂紋的原因；晶界上夾雜物的偏析也是斷裂的原因；另外，即使在遠(yuǎn)遠(yuǎn)小于屈服極限的交變載荷作用下，也會引起發(fā)生疲勞斷裂現(xiàn)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.

在高強(qiáng)度金屬材料中發(fā)生的低應(yīng)力脆性斷裂的過程中，材料組織遠(yuǎn)非均勻的、各向同性的。方管合理使用手段對生銹管件進(jìn)行清理時保證管件長時間的服務(wù)于生產(chǎn)，創(chuàng)造更多的生產(chǎn)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.

造成方管脆性斷裂的多種原因就講解到這里了，您對此有怎樣的疑惑或者需求可以隨時來我們網(wǎng)站http://plisse.cn進(jìn)行咨詢！

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://plisse.cn Consult!