浙江至德钢业有限公司销售人员认为，影响不锈钢管价格的因素除了品牌、材质和生产工艺以外，最重要因素是不锈钢管表面处理方法。为进一步改善管道材料特性，对管道内外表面进行处理 般有四种方法：酸洗钝化（AP）、机械抛光（MP）、光亮退火（BA）和电解抛光（EP）处理工艺。试验资料和实践都证明，通过表面处理后，管道材料的粗糙度减小，表面吸附性减弱。那么AP、MP、BP、EP级不锈钢管的区别在哪？
AP（Acid Pickling）酸洗处理
不锈钢的耐腐蚀能力主要来源于其内含的铬元素与氧气发生反应后在其表面形成一层致密的防护层。而酸洗的作用就是让其提前发生这种反应，以提高不锈钢管的耐腐蚀能力，酸洗过程中会去除管材表面所附着的油污及其他在生产中所沾染的其他物质。管道内外表面较粗糙易有悬浮杂质附着。
MP（Mechanical polishing）机械抛光
抛光轮或抛光带借助抛光剂中的磨料对不锈钢管表面进行抛磨加工，促使不锈钢管面达到平滑抛光效果。其亮度与效果则取决于加工方式的种类。另外机械抛光后虽较美观但也会降低抗蚀性，所以当用在腐蚀环境下需再经过钝化处理，且钢管表面常有抛光材料残留。
The polishing wheel or polishing belt uses the abrasive in the polishing agent to polish the surface of the stainless steel tube to promote the smooth polishing effect of the stainless steel tube surface.Its brightness and effect depend on the type of processing method.In addition，although it is more beautiful after mechanical polishing，it will also reduce the corrosion resistance，so when it is used in a corrosive environment，it needs to be passivated again，and there are often polishing materials left on the surface of the steel pipe.
BA（Bright Annealing）光亮退火
不锈钢管在制造过程中，用于润滑的油脂晶粒也会因加工而变形，为了避免油脂残留在钢管中，在退火时利用高温以氢气充当炉内气氛，借由氢气与钢管表面的碳氧结合燃烧，进一步清洁钢管的表面产生亮面效果，这种利用纯氢气退火加热并快速冷却，以亮化光面的方式叫光辉退火。虽然利用此种方式来亮化表面可保钢管充分干净无任何外来污染。但这种表面的明亮度若与其他抛光方式相较机械、化学、电解会有雾面的感觉。当然其效果也与氢气的含量与加热的次数有关。
During the manufacturing process of the steel pipe，the grease grains used for lubrication will also be deformed due to processing.In order to avoid the grease remaining in the steel pipe，argon gas is used as the furnace atmosphere at high temperature during annealing.Oxygen combined combustion further cleans the surface of the steel pipe to produce a bright surface effect.This kind of annealing and heating with pure argon gas is called bright annealing in the way of brightening the surface.Although using this method to brighten the surface can keep the steel pipe sufficiently clean without any external pollution.However，if the brightness of this surface is mechanical，chemical，or electrolytic compared to other polishing methods，it will feel matte.Of course，the effect is also related to the content of argon gas and the number of heating times.
EP（Electro Polishing）电解光
电解抛光是利用阳极处理的方式，借由电化学的原理，适当地调整电压、电流、酸液组成、以及抛光时间，不但可以使表面达到明亮、顺滑、洁净的效果，更可以提升表面的抗腐蚀性，所以是最佳的亮化表面的方法，当然其成本和技术也相应的提高不少。
不过，因为电解抛光会凸显钢管表面的原始状态，所以若钢管表面有严重刮伤、孔洞，或是夹渣、析出物等，皆可能造成电解失败。其与化学抛光不同之处是，虽然也是在酸性环境中进行，但钢管表面不但不会有任何晶界腐蚀现象，可经由控制表面的氧化铭膜层厚度，使钢管达到的抗蚀性。
However，because the electrolytic polishing will highlight the original state of the surface of the steel pipe，if the surface of the steel pipe has serious scratches，holes，or slag，precipitates，etc.，it may cause electrolytic failure.
The difference between it and chemical polishing is that although it is also carried out in an acidic environment，the surface of the steel pipe will not have any grain boundary corrosion，and the corrosion resistance of the steel pipe can be achieved by controlling the thickness of the chromium oxide film on the surface.
这篇文章主要给大家讲解什么是AP级、MP级、BA级、EP级不锈钢管，AP级、MP级、BA级、EP级不锈钢管各种区别和等级要求。希望对大家有所帮助，有关这方问题，可以随时来电咨询。
