關於一次鱗的外部仍然（rán）存在有更加較大的空（kōng）穴，ND無縫鋼管關（guān）於一次液化（huà）鐵皮為灰灰黑色鱗層，呈（chéng）片狀包含在相應範圍（wéi）之內在謄寫鋼版要樣兒。鱗層重點本人成分由磁鐵（Fe3O4）構成。液化鐵（tiě）皮（pí）可進行劃成關於一次液化鐵皮、關於（yú）二次液化鐵皮、關於三次液化鐵皮和赤巴巴液化鐵皮。關於（yú）一次液（yè）化鐵皮：鋼在熱軋前，經常要在（zài）1100~1300℃受到和保值。在此熱度下，鋼（gāng）要樣兒於（yú）恒溫爐氣（qì）進行聯係出現液化（huà）影響，革命1~3mm厚的關於一次鱗還有由粗軋側壓不盡可（kě）能全麵、除鱗不較為（wéi）絕對關於所致。該關於一次鱗（lín）也進行稱號關（guān）於（yú）一次（cì）液化鐵皮。
Iron oxide scale can be divided into primary oxide scale, secondary oxide scale, tertiary oxide scale and red oxide scale. Primary scale: Before hot rolling, steel is usually heated and kept warm at 1100 - 1300 C. At this temperature, oxidation reaction occurs on the steel surface in contact with high temperature furnace gas, resulting in a primary scale 1-3 mm thick and caused by inadequate side pressure and incomplete descaling during rough rolling. The primary scale is also called primary iron oxide scale. There are large holes in the primary scale. The primary oxide scale of ND steel pipe is grey-black scale, covering the surface of steel plate in sheet form. The scales are mainly composed of magnets (Fe3O4).
關於二次液化鐵（tiě）皮（pí）：熱軋鋼坯從受到爐呈現出來後，經超高壓水除去（qù）關於一次鱗後，即要（yào）樣（yàng）兒液化鐵皮進行遺漏，開展粗軋。在短時段的（de）粗軋完整過程（chéng）中鋼（gāng）坯要樣兒與水（shuǐ）和大氣進行聯係，鋼坯（pī）要樣兒形成了關於二次鱗，nd無縫鋼管也進行稱號關於一次液化鐵皮。關於二次鱗受整體水平研製的產生相應作用厚（hòu）薄較薄，鋼坯與鱗的垂直麵（miàn）剪應力（lì）小（xiǎo），ND無縫鋼管因此退出（chū）性差。在滿足相關條件時噴發超高壓水無（wú）法全部除去關於二次鱗（lín）,鱗留下在謄寫鋼版要樣兒的狀況下開展精軋，產品要樣兒（ér）就會發生進行裂縫（féng）。關於二次液化鐵皮為赤巴巴鱗（lín）層（céng），nd無縫鋼管呈較為清楚的長條（tiáo）、壓入狀，沿研製大方向條形進行散步，鱗層重點本人成（chéng）分由方（fāng）鐵礦石（FeO）、赤鐵礦石（Fe2O3）等豆（dòu）子構成。
Secondary oxide scale: After hot-rolled billet comes out of the heating furnace, the scale is removed by high pressure water, that is, the oxide scale on the surface falls off and rough rolling is carried out. During short roughing process, the surface of billet contacts with water and air, and the surface of billet produces secondary scale. The ND steel pipe is also called primary oxide scale. The thickness of secondary scale affected by horizontal rolling is thinner, the interface stress between billet and scale is smaller, and the peeling property of ND steel pipe is poor. If spraying high-pressure water can not completely remove the secondary scale, and the scale remains on the surface of the steel plate for finishing rolling, defects will appear on the surface of the product. The secondary oxide scale is red scale. The ND steel pipe is obviously long and pressed, and distributes along the rolling direction. The main components of the scale are composed of iron ore (FeO), hematite (Fe2O3) and other particles.
nd無（wú）縫鋼管關於三次液化鐵皮（pí）： 熱軋精軋完整過程中，帶鋼參加每架軋鋼廠時都將形成要樣兒液化鐵大腦皮層。研製後（hòu）借助到最後的除鱗或在每架軋鋼廠彼此之間時還將再一次形成液化鐵皮。因為這個原因，轟隆實際作用下的帶鋼（gāng）要樣兒具體條（tiáo）件將參加於參加各架（jià）軋鋼廠前逐漸形成的液化鐵皮的（de）數（shù）額和特（tè）點。這時（shí）候的液（yè）化鐵皮進行稱號關於三（sān）次（cì）液（yè）化鐵皮，其主要原因（yīn）在於它是在除鱗隨後。nd無縫鋼管參加精軋鋼廠事先逐漸形成的。
Third iron oxide scale of ND steel pipe: During hot rolling and finishing, iron oxide scale will be formed on the surface of strip when it enters each rolling mill. Iron oxide scale will be produced again after rolling through final descaling or between each rolling mill. Therefore, the surface condition of strip under roll action will depend on the quantity and characteristics of oxide scale formed before entering each stand of rolling mill. At this time, the scale of iron oxide is called tertiary scale, because it is after descaling. ND steel pipe formed before entering finishing mill.
關（guān）於三次液化鐵皮（pí）進行裂（liè）縫眼睛由此可見： 黑茶褐色、小舟狀。比較而言麇集、這麽點兒、散沙狀地進行散步（bù）在（zài）進行裂縫帶鋼要樣（yàng）兒，細摸有快感，酸洗（xǐ）後在帶鋼要樣兒進行裂縫處進行（háng）超過不（bú）足不同的銷孔狀小麻坑（kēng），它們在正常化熱軋帶鋼的要樣兒上（shàng）是（shì）看遺失的。
Three times of iron oxide defects can be seen naked eye: black-brown, boat-shaped. Relatively dense, fine and loose sand distribute on the surface of defective strip steel, which has a fine feel. After pickling, pinhole pits with different depths are left on the surface of defective strip steel. They are invisible on the surface of normal hot rolled strip steel.
赤巴巴液化鐵皮： 赤巴巴液化（huà）鐵皮僅出現在高矽容量等一定的人種上，重點因為在鋼坯受到完整過程中，要樣兒液化物與基體（tǐ）非（fēi）金屬著（zhe）名耦合關於所致。無較為清楚深度，呈不平整片狀。
Red iron oxide scale: Red iron oxide scale only occurs in special steel with high silicon content, mainly due to the strong meshing between surface oxide and base metal during billet heating. No obvious depth, irregular sheet.
赤巴巴液化鐵皮分關於兩種： 其中一種在板寬大方向非平均進行散步，重點進行散（sàn）步在之中（zhōng），左右袒進行操（cāo）作側（cè），ND無縫鋼管赤巴（bā）巴與蘭色處有較為清楚水印，在謄（téng）寫鋼（gāng）版長度大方向上也石灰石勻，屈指可數位置稍輕些。這一類型的情況赤巴巴液化鐵皮較（jiào）厚（hòu），矯直時可崩起，能夠使用超高壓風吹去，較為留下赤巴巴很易擦下色，此赤巴（bā）巴液化鐵皮稱紅鏽較適（shì）當。另其中一種赤巴巴液化（huà）鐵皮沿板寬進行散步進行（háng）比較平均，通常（cháng）靠邊部100mm內稍重些，ND無縫鋼管卷表麵比外部（bù）重些。這一類型的情況赤巴巴液化鐵皮較薄，著名擦（cā）下色，謄寫鋼版越厚赤巴巴越重。ND無縫鋼管這一類型的情況（kuàng）赤巴巴液化鐵皮其餘一部分人種也仍然存（cún）在，具備準譜兒的廣泛性。
There are two kinds of red oxide scales: one is non-uniformly distributed in the direction of plate width, mainly distributed in the middle, biased to the operation side. There are obvious watermarks in the red and blue parts of ND steel pipe, and it is not uniform in the direction of steel plate length, and slightly lighter in some parts. This kind of red oxide scale is thicker, can collapse when straightening, can be blown away by high-pressure wind, residual red is easy to rub off color, this red oxide scale is called red rust more appropriate. Another kind of red oxide sheet distributes evenly along the width of the sheet, which is slightly heavier within 100mm on the edge and heavier outside than inside of ND steel pipe coil. This kind of red oxide scale is thinner, and it is not easy to rub off the color. The thicker the steel plate, the heavier the red. ND steel pipe, a kind of red oxide scale, also exists in some other steels, which has certain universality.
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