一、 不銹鋼是什么鋼？

　　1、 What is stainless steel?

　　不銹鋼是鋼的一個種類，鋼是指含有碳（C）量在2%以下的稱之為鋼，大于2%是鐵。鋼在冶煉過程中加入鉻（Cr）、鎳（Ni）、錳（Mn）、硅（Si）、鈦（Ti）、鉬（Mo）等合金元素改善了鋼的性能使鋼具有了耐腐性（即不上銹）就是我們常說的不銹鋼。

　　Stainless steel is a type of steel, which refers to steel containing less than 2% carbon (C) and more than 2% iron. Adding alloying elements such as chromium (Cr), nickel (Ni), manganese (Mn), silicon (Si), titanium (Ti), molybdenum (Mo), etc. during the smelting process improves the properties of steel and gives it corrosion resistance (i.e. no rust), which is commonly known as stainless steel.

　　二、為什么不銹鋼有不同的鋼號？

　　2、 Why are there different grades of stainless steel?

　　不銹鋼通常被分為201、202、301、304、309s、310s、410、420、431等多種型號。其中，201、202、301、304、309s、310s屬于奧氏體不銹鋼，不含有磁性，可耐多種介質(zhì)腐蝕。410、420、431則屬于馬氏體不銹鋼，具有磁性、強度高，但塑性和可焊性較差。其中硫磷含量是一很重要指標(biāo)，碳素結(jié)構(gòu)鋼和優(yōu)質(zhì)碳素結(jié)構(gòu)鋼就是根據(jù)它劃分的：硫，磷含量皆不超過0.04％的鋼，稱為優(yōu)質(zhì)鋼；硫含量不超過0.03％，磷含量不超過0.035％的鋼稱為高級優(yōu)質(zhì)鋼；硫磷含量各不超過0.025％的鋼稱為特級質(zhì)量鋼。

　　Stainless steel is usually divided into various types such as 201, 202, 301, 304, 309s, 310s, 410, 420, 431, etc. Among them, 201, 202, 301, 304, 309s, and 310s belong to austenitic stainless steel, which does not contain magnetism and can withstand corrosion from various media. 410, 420, and 431 belong to martensitic stainless steel, which has magnetism and high strength, but poor plasticity and weldability. The sulfur and phosphorus content is an important indicator, and carbon structural steel and high-quality carbon structural steel are classified based on it: steel with sulfur and phosphorus content not exceeding 0.04% is called high-quality steel; Steel with sulfur content not exceeding 0.03% and phosphorus content not exceeding 0.035% is called high-grade high-quality steel; Steel with sulfur and phosphorus content not exceeding 0.025% is called premium quality steel.

　　常見不銹鋼硫磷含量含量

　　Common sulfur and phosphorus content in stainless steel

　　不銹鋼在冶煉過程當(dāng)中，由于加入合金元素品種不同，不同品種加入量的不同。其特性也是不同的，為了加以區(qū)別則冠上了不同的鋼號，下面是常見裝飾用不銹鋼不同鋼號“合金元素”含量表僅供參考：200系列：鉻-鎳-錳奧氏體不銹鋼300系列：鉻-鎳奧氏體不銹鋼301：延展性好，用于成型產(chǎn)品。也可通過機速硬化。焊接性好。抗磨性和疲勞強度優(yōu)于304不銹鋼。302：耐腐蝕性同304，由于含碳相對要高因而強度更好。302B：是一種含硅量較高的不銹鋼，它具有較高的抗高溫氧化性能。303：通過添加少量的硫、磷使其較削加工。303Se：也用于制作需要熱鐓的機件，因為在這類條件下，這種不銹鋼具有良好的可熱加工性。304：即18/8不銹鋼。GB牌號為0Cr18Ni9。309：較之304有更好的耐溫性。

　　During the smelting process of stainless steel, the amount of alloying elements added varies depending on the type of alloy element added. Their characteristics are also different, and in order to distinguish them, different steel grades are labeled. The following is a table of "alloy element" content for common decorative stainless steels of different steel grades for reference only: 200 series: chromium nickel manganese austenitic stainless steel 300 series: chromium nickel austenitic stainless steel 301: good ductility, used for forming products. It can also be hardened by machine speed. Good weldability. Wear resistance and fatigue strength are superior to 304 stainless steel. 302: Corrosion resistance is the same as 304, and its strength is better due to its relatively higher carbon content. 302B: It is a stainless steel with a high silicon content, which has high resistance to high temperature oxidation. 303: By adding a small amount of sulfur and phosphorus, it can be processed more efficiently. 303Se: It is also used to make parts that require hot forging, as this stainless steel has good hot workability under such conditions. 304: 18/8 stainless steel. The GB grade is 0Cr18Ni9. 309: Compared to 304, it has better temperature resistance.

　　不銹鋼具有抵抗大氣氧化的能力——即不銹性，同時也具有在含酸、堿、鹽的介質(zhì)中乃腐蝕的能力——即耐蝕性。但其抗腐蝕能力的大小是 隨其鋼質(zhì)本身化學(xué)組成、加護狀態(tài)、使用條件及環(huán)境介質(zhì)類型而改變的。如304鋼管，在干燥清潔的大氣中，有絕對優(yōu)良的抗銹蝕能力，但將它移到海濱地區(qū)，在含有大量鹽份的海霧中，很快就會生銹了；而316鋼管則表現(xiàn)良好。因此，不是任何一種不銹鋼，在任何環(huán)境下都能耐腐蝕、不生銹的。

　　304L：是碳含量較低的304不銹鋼的變種，用于需要焊接的場合。較低的碳含量使得在靠近焊縫的熱影響區(qū)中所析出的碳化物減至最少，而碳化物的析出可能導(dǎo)致不銹鋼在某些環(huán)境中產(chǎn)生晶間腐蝕（焊接侵蝕）。304N：是一種含氮的不銹鋼，加氮是為了提高鋼的強度。

　　304L: It is a variant of 304 stainless steel with lower carbon content, used for welding applications. The lower carbon content minimizes the precipitation of carbides in the heat affected zone near the weld, which may lead to intergranular corrosion (welding erosion) of stainless steel in certain environments. 304N: It is a nitrogen-containing stainless steel, and nitrogen is added to improve the strength of the steel.

　　化學(xué)成分（質(zhì)量分數(shù)，%）鋼號碳硅錳磷硫鉻鎳304≤0.08≤1.00≤2.00≤0.045≤0.0318-208-10301≤0.15≤1.00≤2.00≤0.045≤0.0316-186-8202≤0.15≤1.007.5-10≤0.05≤0.0317-194-6201≤0.15≤1.005.5-7.5≤0.05≤0.0316-183.5-5.5

　　Chemical composition (mass fraction,%) Steel grade carbon silicon manganese phosphorus sulfur chromium nickel 304 ≤ 0.08 ≤ 1.00 ≤ 2.00 ≤ 0.045 ≤ 0.0318-208-10301 ≤ 0.15 ≤ 1.00 ≤ 2.00 ≤ 0.045 ≤ 0.0316-186-8202 ≤ 0.15 ≤ 1.007.5-10 ≤ 0.05 ≤ 0.0317-194-6201 ≤ 0.15 ≤ 1.005.5-7.5 ≤ 0.05 ≤ 0.0316-183.5-5.5

　　三、電梯門套常用的不銹鋼有哪種以及區(qū)別

　　3、 What are the commonly used types of stainless steel for elevator door frames and their differences

　　被用于電梯門套的不銹鋼主要有201不銹鋼與304不銹鋼以及復(fù)合不銹鋼三種。

　　There are mainly three types of stainless steel used for elevator door frames: 201 stainless steel, 304 stainless steel, and composite stainless steel.

　　主要區(qū)別：1、成分：由于其成本不同，價格不同。304質(zhì)量好一些，同時價格相對較貴；201相對差一些，但價格有一定優(yōu)勢；復(fù)合不銹鋼介于兩者之間。

　　Main difference: 1. Ingredients: Due to their different costs, prices vary. 304 has better quality but relatively higher price; 201 is relatively inferior, but has a certain advantage in price; Composite stainless steel is between the two.

　　2、組成：201組成為17Cr-4.5Ni-6Mn-N，是節(jié)Ni鋼種，301鋼的替代鋼。經(jīng)冷加工后具有磁性，用于鐵路車輛。　304組成為18Cr-9Ni，是得到最廣泛應(yīng)用的不銹鋼、耐熱鋼。用于食品生產(chǎn)設(shè)備、昔通化工設(shè)備、核能等。? ?復(fù)合不銹鋼為304不銹鋼薄板和鍍鋅板加熱到200℃，通過中間介質(zhì)高分子膜貼合而成，產(chǎn)品結(jié)構(gòu)緊密，具有減震、降噪、強度高等優(yōu)點，由于厚度較厚，用于電梯轎廂、廳門、轎門等。

　　2. Composition: 201 is composed of 17Cr-4.5Ni-6Mn-N, which is a type of Ni steel and a substitute for 301 steel. After cold processing, it has magnetism and is used for railway vehicles. The composition of 304 is 18Cr-9Ni, which is the most widely used stainless steel and heat-resistant steel. Used for food production equipment, Xitong chemical equipment, nuclear energy, etc? Composite stainless steel is made by heating 304 stainless steel sheet and galvanized sheet to 200 ℃, and bonding them together through an intermediate medium polymer film. The product has a tight structure and advantages such as shock absorption, noise reduction, and high strength. Due to its thick thickness, it is used for elevator cars, hall doors, car doors, etc.

　　3、201是含錳較高,表面很亮帶有暗黑的亮,含錳較高容易生銹。304含鉻較多,表面呈現(xiàn)啞光,不生銹.兩種放在一起就有比較了。最重要的就是耐腐蝕性能不同,201的耐腐蝕性能很差,所以價格就要便宜很多.又因為201含鎳低，所以價格比304的低，于是耐腐蝕性能就不如304的了。復(fù)合不銹鋼表面由304組成，表面具有304不銹鋼的特性。

　　3. 201 has a high manganese content, with a bright and dark surface, and is prone to rusting due to its high manganese content. 304 contains a lot of chromium, with a matte surface and no rusting. The two types can be compared together. The most important thing is that the corrosion resistance is different. 201 has poor corrosion resistance, so the price is much cheaper. Also, because 201 contains low nickel, the price is lower than 304, so the corrosion resistance is not as good as 304. The surface of composite stainless steel is composed of 304 and has the characteristics of 304 stainless steel.

　　4、201不銹鋼在特定環(huán)境下會生銹，譬如說放置于鹽水浸泡就會生銹，但是日常環(huán)境下是極不易生銹的。不銹鋼材質(zhì)是因為含有鎳元素，才有不易生銹的能力，而相較于304不銹鋼來說，201不銹鋼中的鎳元素會更少，因此要比304不銹鋼更容易生銹。復(fù)合不銹鋼的表面材質(zhì)為304不銹鋼，而生銹主要表層氧化，因此復(fù)合不銹鋼抗銹蝕能力優(yōu)于201不銹鋼。

　　4. 201 stainless steel will rust in specific environments, such as soaking in salt water, but it is extremely difficult to rust in daily environments. Stainless steel material has the ability to resist rusting due to its nickel content, and compared to 304 stainless steel, 201 stainless steel contains less nickel, making it more prone to rusting. The surface material of composite stainless steel is 304 stainless steel, and rust is mainly caused by surface oxidation, so the corrosion resistance of composite stainless steel is better than that of 201 stainless steel.

　　當(dāng)不銹鋼管表面出現(xiàn)褐色銹斑（點）的時候，人們大感驚奇：認為 “不銹鋼是不生銹的，生銹就不是不銹鋼了，可能是鋼質(zhì)出現(xiàn)了問題”。其實，這是對不銹鋼缺乏了解的一種片面的錯誤看法。不銹鋼在一定的條件下也會生銹的。

　　When brown rust spots (dots) appear on the surface of stainless steel pipes, people are greatly surprised: they believe that "stainless steel does not rust, and if it rusts, it is not stainless steel anymore. It may be a problem with the steel. In fact, this is a one-sided misconception about the lack of understanding of stainless steel. Stainless steel can also rust under certain conditions.

　　四、傳統(tǒng)電梯門套以及步亨快裝的安裝工藝

　　4、 The installation process of traditional elevator door frames and Bucheng quick installation

　　傳統(tǒng)不銹鋼電梯門套以木工板框架打好基礎(chǔ)，不銹鋼折板包，施工速度較慢，人力成本較高，兩人一組，平均每日安裝僅10套左右。人力成本較高，容錯率較低。

　　Traditional stainless steel elevator door frames are based on a wooden board frame and wrapped in stainless steel folded plates, which results in slower construction speed and higher labor costs. Two people work in groups, and the average daily installation is only about 10 sets. High labor costs and low fault tolerance.

　　步亨快裝不銹鋼，出廠時防火板代替木工板已貼制完成，無需工人現(xiàn)場打底，貨到現(xiàn)場后無需協(xié)調(diào)水、電，即可迅速投入安裝。兩人一組平均每日安裝數(shù)量可達80-100套，每套安裝成本約計60元左右。其中復(fù)合不銹鋼由于默認1.2mm厚度，更無需木工板或防火板打底支撐。

　　Bu Heng Quick Installation Stainless Steel, fireproof board has been pasted instead of wooden board before leaving the factory, without the need for workers to base on site. After the goods arrive at the site, there is no need to coordinate water and electricity, and they can be quickly put into installation. The average daily installation quantity of two people can reach 80-100 sets, and the installation cost per set is about 60 yuan. Among them, composite stainless steel has a default thickness of 1.2mm and does not require wooden boards or fireproof boards for bottom support.

　　其次由于電梯門垛垂直度問題，會導(dǎo)致每層不一，傳統(tǒng)工藝電梯門套在安裝時由于無法現(xiàn)場裁剪，每層的安裝尺寸均會有些許誤差，需要土建修補。步亨快裝電梯門套由于采用的卡扣設(shè)計，可規(guī)避3-5cm土建誤差，因此安裝完畢后，效果更為標(biāo)準(zhǔn)美觀。

　　Secondly, due to the issue of verticality of elevator door stacks, each floor may be different. Traditional craftsmanship elevator door frames cannot be cut on site during installation, resulting in slight errors in the installation dimensions of each floor and requiring civil engineering repairs. Due to the use of a buckle design, the door frame of the Buheng Quick Installation elevator can avoid 3-5cm civil engineering errors, resulting in a more standard and beautiful effect after installation.

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