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无缝钢管表面除锈工艺是如何完成的?

来源:http://www.jnxxjm.com

【 发布于:2019-06-03 17:39:30 】


于钢管常用的环氧类、乙烯类、酚醛类等防腐涂料的施工工艺,普通请求钢管外表到达近白级(Sa2.5)。理论证明,采用这种除锈等级简直能够除掉一切的氧化皮、锈和其他污物,锚纹深度到达40~100μm,充沛满足防腐层与钢管的附着力请求,而喷(抛)射除锈工艺可用较低的运转费用和稳定牢靠的质量到达近白级(Sa2.5)技术条件。

In the construction process of epoxy, ethylene, phenolic and other anticorrosive coatings commonly used in steel pipes, the appearance of steel pipes is generally required to reach near white grade (Sa2.5). It has been proved theoretically that all oxidized scales, rusts and other contaminants can be removed by using this kind of rust removal grade. The anchorage depth reaches 40-100 um, which fully meets the requirements of adhesion between the anticorrosive coating and the steel pipe. The spray (throw) rust removal process can reach the near-white level (Sa2.5) technical conditions with lower operating cost and stable and reliable quality.

2喷(抛)射磨料

2 shotcrete (shotcrete) abrasive

为了到达理想的除锈效果,应依据钢管外表的硬度、原始锈蚀水平、请求的外表粗糙度、涂层类型等来选择磨料,关于单层环氧、二层或三层聚乙烯涂层,采用钢砂和钢丸的混合磨料更易到达理想的除锈效果。钢丸有强化钢外表的作用,而钢砂则有刻蚀钢外表的作用。钢砂和钢丸的混合磨料(通常钢丸的硬度为40~50 HRC,钢砂的硬度为50~60 HRC可用于各种钢外表,即便是用在C级和D级锈蚀的钢外表上,除锈效果也很好。

In order to achieve the ideal rust removal effect, Abrasives should be selected according to the hardness of steel pipe surface, the original rust level, the required surface roughness, coating type, etc. For single epoxy, two or three layers of polyethylene coatings, it is easier to achieve the ideal rust removal effect by using a mixture of steel sand and steel balls. Steel shot has the effect of strengthening steel appearance, while steel sand has the effect of etching steel appearance. Mixed abrasives of steel sand and steel shot (usually the hardness of steel shot is 40-50 HRC, the hardness of steel sand is 50-60 HRC) can be used for various steel surfaces, even for C-grade and D-grade corroded steel surfaces, the effect of rust removal is very good.

3磨料的粒径及配比

Particle Size and Proportion of 3 Abrasive

为取得较好的平均清洁度和粗糙度散布,磨料的粒径及配比设计相当重要。粗糙度太大易形成防腐层在锚纹尖峰处变薄;同时由于锚纹太深,在防腐过程中防腐层易构成气泡,严重影响防腐层的性能。

In order to obtain better average cleanliness and roughness dispersion, the design of abrasive particle size and ratio is very important. It is easy to form anticorrosive coatings at the peak of anchor lines when the roughness is too large. At the same time, because the anchor lines are too deep, the anticorrosive coatings are easy to form bubbles in the anticorrosive process, which seriously affects the performance of the anticorrosive coatings.

粗糙度太小会形成防腐层附着力及耐冲击强度降落。关于严重的内部点蚀,不能仅靠大颗粒磨料高强度冲击,还必需靠小颗粒打磨掉腐蚀产物来到达清算效果,同时合理的配比设计不只可减缓磨料对管道及喷嘴(叶片)的磨损,而且磨料的应用率也可大大进步。通常,钢丸的粒径为0.8~1.3 mm,钢砂粒径为0.4~1.0 mm,其中以0.5~1.0 mm为主要成分。砂丸比普通为5~8。

Too small roughness will cause the adhesion and impact strength drop of the anti-corrosion coating. For serious internal pitting corrosion, not only the high-strength impact of large abrasive particles, but also the small abrasive particles must be used to polish the corrosion products to achieve liquidation effect. At the same time, reasonable proportion design can not only slow down the abrasive wear on pipelines and nozzles (blades), but also greatly improve the application rate of abrasives. Usually, the diameter of steel shot is 0.8-1.3 mm and steel sand is 0.4-1.0 mm, in which 0.5-1.0 mm is the main component. The ratio of sand balls is 5 to 8.

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中国无缝管网近日得悉:应该留意的是在实践操作中,磨料中钢砂和钢丸的理想比例很难到达,缘由是硬而易碎的钢砂比钢丸的破碎率高。为此,在操作中应不时抽样检测混合磨料,依据粒径散布状况,向除锈机中掺入新磨料,而且掺人的新磨料中,钢砂的数量要占主要的。

China seamless pipeline network recently learned that it should be noted that in practice, the ideal ratio of steel sand and steel shot in abrasive is difficult to reach, because the crushing rate of hard and fragile steel sand is higher than that of steel shot. Therefore, the mixed Abrasives should be sampled from time to time in operation. According to the particle size distribution, new Abrasives should be added to the rust remover, and the amount of steel sand is the main part of the new abrasives.

4除锈速度

4. Rust Removal Speed

钢管的除锈速度取决于磨料的类型和磨料的排量,即单位时间内磨料施加到钢管的总动能E及单颗粒磨料的动能E1。

The speed of rust removal depends on the type of abrasives and the discharge of abrasives, i.e. the total kinetic energy E applied by Abrasives per unit time to the steel tube and the kinetic energy E1 of single abrasive particles.

式中: m ——磨料的喷(抛)量;

In the formula: m - the amount of abrasive spraying (throwing);

V ——磨料运转速度;

V - Abrasive running speed;

m1——单颗粒磨料的质量。

M1 - The quality of single abrasive.

m。的大小与磨料破碎率有关,破碎率大小直接影响外表处置作业的本钱及除锈设备的费用。当设备固定不变后,m为常数,y为常数,所以E也是一个常数,但由于磨料破碎,m1发作变化,因而,普通应选择损耗率较低的磨料,这样有利于进步清算速度和长叶片的寿命。

M. The size of the crushing rate is related to the abrasive crushing rate, which directly affects the cost of surface disposal operations and the cost of rust removal equipment. When the equipment is fixed, m is constant and Y is constant, so E is also a constant. However, due to the breakage of abrasives and the change of m1, abrasives with low wear rate should be generally selected, which is beneficial to improving clearing speed and long blade life.

5清洗和预热

5 Cleaning and Preheating

中国无缝管网近日得悉:在喷(抛)射处置前,采用清洗的办法除去钢管外表的油脂和积垢,采用加热炉对管体预热至40一60℃,使钢管外表坚持枯燥状态。在喷(抛)射处置时,由于钢管外表不含油脂等污垢,可加强除锈的效果,枯燥的钢管外表也有利于钢丸、钢砂与锈和氧化皮的别离,使除锈后的钢管外表愈加干净。

China seamless pipeline network recently learned that before spraying (throwing) disposal, cleaning method was used to remove grease and scale on the surface of the steel pipe, and heating furnace was used to preheat the pipe body to 40-160 C, so that the appearance of the steel pipe adhered to a dry state. In spraying (throwing) disposal, because the steel pipe surface does not contain grease and other dirt, it can enhance the effect of rust removal. The dull steel pipe surface is also conducive to the separation of steel shot, steel sand and rust and oxide scale, so that the steel pipe surface after rust removal becomes cleaner.

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