浙江至德鋼業(yè)有限公司銷售人員認(rèn)為，影響不銹鋼管價(jià)格的因素除了品牌、材質(zhì)和生產(chǎn)工藝以外，最重要因素是不銹鋼管表面處理方法。為進(jìn)一步改善管道材料特性，對(duì)管道內(nèi)外表面進(jìn)行處理 般有四種方法：酸洗鈍化（AP）、機(jī)械拋光（MP）、光亮退火（BA）和電解拋光（EP）處理工藝。試驗(yàn)資料和實(shí)踐都證明，通過表面處理后，管道材料的粗糙度減小，表面吸附性減弱。那么AP、MP、BP、EP級(jí)不銹鋼管的區(qū)別在哪？

AP（Acid Pickling）酸洗處理

  不銹鋼的耐腐蝕能力主要來源于其內(nèi)含的鉻元素與氧氣發(fā)生反應(yīng)后在其表面形成一層致密的防護(hù)層。而酸洗的作用就是讓其提前發(fā)生這種反應(yīng)，以提高不銹鋼管的耐腐蝕能力，酸洗過程中會(huì)去除管材表面所附著的油污及其他在生產(chǎn)中所沾染的其他物質(zhì)。管道內(nèi)外表面較粗糙易有懸浮雜質(zhì)附著。

MP（Mechanical polishing）機(jī)械拋光

  拋光輪或拋光帶借助拋光劑中的磨料對(duì)不銹鋼管表面進(jìn)行拋磨加工，促使不銹鋼管面達(dá)到平滑拋光效果。其亮度與效果則取決于加工方式的種類。另外機(jī)械拋光后雖較美觀但也會(huì)降低抗蝕性，所以當(dāng)用在腐蝕環(huán)境下需再經(jīng)過鈍化處理，且鋼管表面常有拋光材料殘留。

  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

  不銹鋼管在制造過程中，用于潤(rùn)滑的油脂晶粒也會(huì)因加工而變形，為了避免油脂殘留在鋼管中，在退火時(shí)利用高溫以氫氣充當(dāng)爐內(nèi)氣氛，借由氫氣與鋼管表面的碳氧結(jié)合燃燒，進(jìn)一步清潔鋼管的表面產(chǎn)生亮面效果，這種利用純氫氣退火加熱并快速冷卻，以亮化光面的方式叫光輝退火。雖然利用此種方式來亮化表面可保鋼管充分干凈無任何外來污染。但這種表面的明亮度若與其他拋光方式相較機(jī)械、化學(xué)、電解會(huì)有霧面的感覺。當(dāng)然其效果也與氫氣的含量與加熱的次數(shù)有關(guān)。

  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）電解光

 電解拋光是利用陽極處理的方式，借由電化學(xué)的原理，適當(dāng)?shù)卣{(diào)整電壓、電流、酸液組成、以及拋光時(shí)間，不但可以使表面達(dá)到明亮、順滑、潔凈的效果，更可以提升表面的抗腐蝕性，所以是最佳的亮化表面的方法，當(dāng)然其成本和技術(shù)也相應(yīng)的提高不少。

 不過，因?yàn)殡娊鈷伖鈺?huì)凸顯鋼管表面的原始狀態(tài)，所以若鋼管表面有嚴(yán)重刮傷、孔洞，或是夾渣、析出物等，皆可能造成電解失敗。其與化學(xué)拋光不同之處是，雖然也是在酸性環(huán)境中進(jìn)行，但鋼管表面不但不會(huì)有任何晶界腐蝕現(xiàn)象，可經(jīng)由控制表面的氧化銘膜層厚度，使鋼管達(dá)到的抗蝕性。

 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.

這篇文章主要給大家講解什么是AP級(jí)、MP級(jí)、BA級(jí)、EP級(jí)不銹鋼管，AP級(jí)、MP級(jí)、BA級(jí)、EP級(jí)不銹鋼管各種區(qū)別和等級(jí)要求。希望對(duì)大家有所幫助，有關(guān)這方問題，可以隨時(shí)來電咨詢。