nd無縫鋼管的（de）外（wài）圍鐵皮重點（diǎn）有四大類構成（chéng），各（gè）自是關於一次液化鐵皮，關於二（èr）次液化鐵皮，關於三次液化鐵皮和赤巴巴液化鐵皮。nd無縫鋼管每關於一層的液化（huà）鐵皮因（yīn）為其製造工藝和混凝（níng）土的材料有所（suǒ）區別而開展進行區分，到最後關（guān）於四種鐵皮結合後（hòu）成為nd無（wú）縫鋼管（guǎn）的外圍整體（tǐ）結構（gòu）。針對（duì）關於四（sì）種外圍鐵皮，我們（men）來開（kāi）展（zhǎn）一部分更為（wéi）簡便的掌握。關於一次液化鐵皮：鋼在熱軋前，經常（cháng）要在１１００～１３００℃受到和保值。在此熱度（dù）下，鋼要樣兒於（yú）恒溫爐氣進（jìn）行聯係出現液化影響，革（gé）命１～３ｍｍ厚（hòu）的關於一次鱗還有由粗軋側壓不盡可能全麵、除鱗不較為絕對關於所致（zhì）。該關於一次鱗也進行稱號關於一次液化鐵皮。關於一次鱗的外部仍然存在有更加較大的空穴，nd無縫鋼管關於一次液化鐵皮為灰灰黑色鱗層，呈片狀包含在相應範圍之內在謄寫鋼版要樣兒（ér）。
The outer iron sheet of ND steel pipe mainly consists of four kinds: primary oxide sheet, secondary oxide sheet, tertiary oxide sheet and red oxide sheet. Each layer of iron oxide scale is divided according to its production process and specific material. Finally, four kinds of iron scale are combined to form the outer structure of ND steel pipe. For four kinds of outer iron sheets, we have a simple understanding. Primary scale: Before hot rolling, steel is often heated and kept warm at 1100 - 1300 (?) 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, as well as inadequate side pressure during rough rolling and incomplete descaling. 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, which covers the surface of steel plate in sheet form. 鱗層重點本人成分由磁鐵（tiě）（Ｆｅ３Ｏ４）構成。關於二次液化鐵皮：熱軋鋼坯從受到爐呈現出來後，經（jīng）超高壓水除去關於一次鱗後，即要樣兒液化鐵皮（pí）進行遺漏，開展粗（cū）軋。在短（duǎn）時段的粗軋完整過程中鋼坯要樣兒（ér）與水和（hé）大氣（qì）進行聯係，鋼坯要樣兒形成（chéng）了關（guān）於二次鱗，nd無縫鋼管也進行稱號關於一次液化鐵（tiě）皮。
The scales are mainly composed of magnets (Fe3O4). Secondary oxide scale: After hot-rolled billet comes out of the heating furnace, the scales are 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.
關於二次鱗受整體水平研製的產生（shēng）相應（yīng）作用厚薄（báo）較（jiào）薄，鋼坯與鱗的垂直麵剪應力小，nd無縫鋼管因此退出性差。在滿足相關條件時噴發超高壓水無法全部除去（qù）關於二次鱗，鱗留下在謄寫（xiě）鋼版要樣兒的狀（zhuàng）況下開展精軋（zhá），產（chǎn）品要樣兒就會發生進行裂縫。
The thickness of secondary scale affected by horizontal rolling is thin, the interface stress between billet and scale is small, and the stripping 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.
關於二次液化鐵皮為（wéi）赤巴巴鱗層，nd無縫（féng）鋼管呈較為清楚的長條、壓入狀，沿研製（zhì）大方向條形進行散（sàn）步，鱗層重點本（běn）人成分由方鐵礦石（ＦｅＯ）、赤鐵礦石（Ｆｅ２Ｏ３）等豆子構成。
The secondary oxide scale is red scale. The ND steel pipe is obviously long and pressed, and distributes in strip along rolling direction. The scale is mainly composed of iron ore (FeO), hematite (Fe2O3) and other particles.
nd無縫鋼管關於（yú）三次液化（huà）鐵皮：
Third-order oxide scale for ND steel pipe:
熱軋精軋完整過程中，帶鋼參加每（měi）架軋（zhá）鋼廠時（shí）都將形成要樣兒液化鐵大腦皮層。研製（zhì）後借助到最後的除鱗或在（zài）每架軋鋼廠彼此（cǐ）之間時還將再一（yī）次形成（chéng）液化鐵皮。因為這個原因（yīn），轟隆實際作用下的帶鋼要（yào）樣（yàng）兒具體條件將參加於參加（jiā）各架軋（zhá）鋼廠前逐漸形成的液化鐵皮的數額和特點（diǎn）。這時候的液化（huà）鐵皮進行稱（chēng）號關於三次液化鐵皮，其主要原因在（zài）於它是在除鱗隨後。nd無縫鋼管參加（jiā）精軋（zhá）鋼廠事先逐漸形成的。
In the process of hot rolling and finishing, iron oxide coating will be produced 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 strip surface conditions under the action of rolls will depend on the number and characteristics of oxide scales 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.
關於三次液化鐵皮進行裂縫眼睛由此可見：
The third iron oxide defect is visible to the naked eye.
黑茶褐色、小舟狀。比較而言麇集、這麽（me）點兒、散沙狀地進行散步在進行裂縫帶鋼要樣兒（ér），細摸有快感，酸洗後在帶鋼要樣（yàng）兒進行裂縫處進（jìn）行超過不足不同的銷孔狀小（xiǎo）麻坑，它們在正常化熱軋帶鋼的要樣兒上是（shì）看遺（yí）失的。
Black-brown, boatlike. Relatively dense, fine and scattered sand distributes 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, which are invisible on the surface of normal hot rolled strip steel.
赤巴巴（bā）液化鐵皮：
Red oxide scale:
赤（chì）巴巴液化鐵皮僅出現在高矽（guī）容量等一定的人種上，重點因為在鋼坯受到完（wán）整過程（chéng）中，要樣兒液（yè）化物與基體非金屬著名耦合關於所致。無（wú）較為清楚深度，呈（chéng）不平整片狀。
The red oxide scale only occurs on special steel grades such as high silicon content. It is mainly due to the strong meshing between surface oxide and matrix metal during billet heating. No obvious depth, irregular sheet.
赤巴（bā）巴液化鐵皮分關於兩種：
There are two kinds of red oxide scales:
其中一種在板寬大方向非平均進行散步，重點進行散步（bù）在（zài）之中，左右袒進行操（cāo）作側，nd無縫鋼管赤巴巴（bā）與蘭色（sè）處有較為清楚水印，在謄（téng）寫鋼版長度大方向上也石灰石勻，屈指可數位（wèi）置稍輕些。這一類型的情況赤巴（bā）巴液化鐵皮較厚，矯直時可崩起，能夠使用超高壓風吹去，較為留下赤巴（bā）巴很易擦下色，此赤巴巴液化鐵（tiě）皮稱紅鏽（xiù）較適當。
A kind of non-uniform distribution in the direction of plate width, mainly distributed in the middle, biased to the operation side, ND steel pipe red and blue have obvious watermarking, in the direction of steel plate length is not uniform, some parts are slightly lighter. The red oxide scale is thicker and can collapse when straightening. It can be blown away by high pressure wind. The residual red color is easy to rub off. This red oxide scale is called red rust.
另（lìng）其中一種赤巴巴液化鐵皮沿板寬進行散步（bù）進行比較平均，通常靠邊部１００ｍｍ內稍重（chóng）些，nd無（wú）縫鋼管（guǎn）卷表麵比外部重些。這一（yī）類型的情（qíng）況赤巴巴液化鐵皮較薄，著名擦下（xià）色，謄（téng）寫鋼版越厚赤巴巴越重。nd無縫鋼管這一類型的（de）情況赤巴巴液化鐵皮其餘一部分人種也仍然存在，具備準譜兒的廣泛性。
Another kind of red oxide sheet distributes evenly along the width of the sheet, which is slightly heavier within 100 mm on the edge and heavier outside than inside of ND steel tube coil. This kind of red iron oxide scale is thin and difficult to rub off the color. The thicker the steel plate, the heavier the red. The red oxide scale of ND steel pipe also exists in some other steels, which has certain universality.
