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热镀锌槽钢镀锌的特点介绍

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【 发布于:2018-08-03 18:35:00 】


1、线外退火

1, out of line annealing

线外退火就是热轧或冷轧钢进入热镀锌作业线之前,首先在抽底式退火炉或罩式退火炉中进行再结晶退火。因为钢材在热镀锌之前必须保持一个无氧化物和其他脏物存在的洁净的纯铁活性表面。这种方法是先由酸洗的方法把经退火的表面氧化铁皮清除,然后涂上一层由氯化锌或由氯化铵和氯化锌混合组成的溶剂进行保护,从而防止钢材再被氧化。

Out-of-line annealing is the recrystallization annealing of hot-rolled or cold-rolled steel before entering the hot-dip galvanizing line. Because the steel must remain clean and pure iron active surface before hot-dip galvanizing. This method is first removed from the annealed surface of the oxide iron, and then coated with a layer of zinc chloride, or a mixture of ammonium chloride and zinc chloride, to protect the steel, so as to prevent the steel from being oxidized.

湿法热镀锌

Wet hot dip galvanizing

钢材表面的溶剂不经烘干就进入起表面覆盖有熔融态溶剂的锌液进行热镀锌。此方法的缺点是:

The solvent on the surface of the steel enters into the zinc bath covered with molten solvent without drying. The shortcoming of this method is:

a.只能在无铅状态下镀锌,镀层的合金层很厚且粘附性不好;

A. can only be galvanized in lead-free condition. The alloy coating is thick and has poor adhesion.

b.生成的锌渣都积存在锌液和铅液的界面处而不能沉积锅底,这样钢材因穿过锌层污染了表面。

B. The resulting zinc slag is deposited at the interface between zinc and lead and can not be deposited on the bottom of the pot. Thus, the surface of the steel is polluted by passing through the zinc layer.

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镀锌钢管

Galvanized steel pipe

因此,湿法热镀锌已基本被淘汰。

Therefore, wet hot galvanizing has been basically eliminated.

单支钢材

Single branch steel

这种方法一般是采用热轧叠轧板作为原料,首先把经过退火的钢材送入酸洗车间,用硫酸或盐酸清除钢材表面的氧热镀锌法化铁皮。酸洗之后的钢材立即进入水箱中浸泡等待镀锌,以防止钢材再氧化。后经过酸洗、水清洗、挤干、烘干、进入锌锅热镀锌,再进行涂油和铬化处理。这种方法生产的热镀锌板比湿法镀锌成品质量有显著提高,只对小规模生产有一定价值。

In this method, the hot rolled strip is used as the raw material. First, the annealed steel is sent to the pickling workshop, and the steel surface of the steel surface is removed by sulfuric acid or hydrochloric acid. After pickling, the steel will imtely enter the water tank and soak and wait for zinc plating to prevent the steel from reoxidation. After pickling, water cleaning, extrusion drying, drying, zinc hot-dip galvanization, then oiling and chromium treatment. The quality of hot-dip galvanized sheet produced by this method is significantly higher than that of wet galvanized product, and it has only a certain value for small-scale production.

2、线内退火

2, intra line annealing

线内退火就是由冷轧或热轧车间直接提供带卷作为热镀锌的原板,在热镀锌作业线内进行气体保护再结晶退火。属于这个类行业的热镀锌方法包括:森吉米尔法、改良森吉米尔法、美钢联法(同日本川崎法)、赛拉斯法、莎伦法。

In-line annealing is that strip coils are directly provided by cold rolling or hot rolling mills as hot-dip galvanized boards, and gas-shielded recrystallization annealing is carried out in the hot-dip galvanizing line. The hot-dip galvanizing methods that belong to this category include: the son gem method, the improved zameli method, the United States Steel Union (and the Japanese Kawasaki Nori), the Silas law, and the Sharon method.

(1)森吉米尔法它是把退火工艺和热镀锌工艺联合起来,其线内退火主要包括氧化炉,还原炉两部份组成。带钢在氧化炉中煤气火焰直接加热到450度左右,把带钢表面残存的轧制油烧掉,净化表面。后再把带钢加热到700-800度完成再结晶退火,经冷却段控制进锌锅前温度在480度左右,最后在不接触空气的情况下进入锌锅镀锌,因此,森吉米尔法产量高、镀锌质量较好,此法曾得到广泛应用。

(1) Sendzimir process combines annealing process with hot-dip galvanizing process. In-line annealing mainly consists of oxidation furnace and reduction furnace. The strip is heated directly to 450 degrees by gas flame in the oxidation furnace, which burns the remaining rolling oil on the strip surface and purifies the surface. Then the strip is heated to 700-800 degrees to finish the recrystallization annealing, and the temperature is about 480 degrees before the cooling section is controlled by the cooling section. Finally, the zinc pan is galvanized in the case of no contact with the air. Therefore, the high yield and the better quality of the galvanizing are obtained. This method has been widely used.

(2)美钢联法

(2) United States steel combined method

它是森吉米尔法的一个变种,它仅仅是利用一个碱性电解脱脂槽取代了氧化炉的脱脂作用,其余工序与森吉米尔法基本相同。在原板进入作业线后,首先进行电解脱脂,而后水洗、烘干,再通过有保护气体的还原炉进行再结晶退火,最后在密封情况下进入锌锅热镀锌。这种方法因带钢不经过氧化炉加热,所以表面的氧化膜较薄,可适当降低还原炉中保护气体的氢含量。这样,对炉安全和降低生产成本有利。但是,由于带钢得不到预加热就进入还原炉中,这样无疑提高了还原炉的热负荷,影响炉子的寿命。因此这种方法并未得广泛应用。

It is a variant of Sen Jimmy Apha, which only uses an alkaline electrolytic degreasing tank to replace the degreasing effect of the oxidizer, and the rest of the process is basically the same as Sen Jimmy Apha. After the original plate entered the operating line, the first electrolytic degreasing was first carried out, then washed and dried, then the recrystallized annealing was carried out by the reducing furnace with protective gas. Finally, the zinc pot was hot-dip galvanized under the sealing condition. Because the strip is not heated in an oxidizing furnace, the oxide film on the surface of the strip is thin and the hydrogen content of the protective gas in the reducing furnace can be reduced appropriately. In this way, the furnace is safe and the production cost is reduced. However, because the strip can not be preheated into the reduction furnace, this undoubtedly increases the heat load of the reduction furnace, affecting the life of the furnace. Therefore, this method has not been widely used.

(3)赛拉斯法

(3) Silas law

又称火焰直接加热法;首先带钢经碱洗脱脂,而后用盐酸清除表面的氧化皮,并经水洗、烘干后再进入由煤气火焰直接加热的立式线内退火炉,通过严格控制炉内煤气和空气的焰烧比例,使之在煤气过剩和氧气不足的情况下进行不完全焰烧,从而使炉内造成还原气氛。使其快速加热达到再结晶温度并在低氢保护气氛下冷却带钢,最后在密闭情况下浸入锌液,进行热镀锌。该法设备紧凑,投资费用低,产量高(最高可达50/小时)。但生产工艺复杂,特别是在机组停止运转时,为了避免烧断带钢,需要采用炉子横移离开钢带的方法,这样操作问题很多,所以,热镀锌工业采用此法很少。

It is also called direct flame heating method; first, the strip is degreased by alkali washing and then cleaned by hydrochloric acid and then washed and dried into a vertical line annealing furnace which is directly heated by the gas flame. By strictly controlling the burning ratio of gas and air in the furnace, it is made in the case of excess gas and oxygen shortage. The furnace is not completely flame burning, resulting in a reduction atmosphere in the furnace. The strip is heated rapidly to recrystallization temperature and cooled in low hydrogen protective atmosphere. Finally, the strip is dipped in zinc solution under sealed condition for hot galvanizing. The method is compact in equipment, low in investment cost and high in output (up to 50/ hours). But the production process is complex, especially when the unit stops running. In order to avoid burning the strip, it is necessary to use the furnace to move away from the steel strip. So there are many problems, so the hot galvanizing industry uses this method very little.

(4)莎伦法

(4) Sharon method

1939年美国莎伦公司投产一台新型的热镀锌机组,所以也叫莎伦法。该法是在退火炉内向带钢喷射氯化氢气体并使带钢达到再结晶温度,所以也称为气体酸洗法。采用氯化氢气体酸洗,不但能去除带钢表面的氧化皮,而且同时去除了带钢表面的油脂,由于带钢表面被氧化气体腐蚀,形成麻面,所以使用莎伦法所得到的镀层粘附性特别好。但是由于设备腐蚀严重,由此造成很高的设备维修和更新费用。因而此种方法很少被采用。

In 1939, Sharon company of the United States put into operation a new type of galvanizing line, so it was also called the Sharon method. This method is also called gas pickling method because it sprays hydrogen chloride gas into the strip in the annealing furnace and makes the strip reach the recrystallization temperature. The use of hydrogen chloride gas pickling can not only remove the oxide skin on the strip surface, but also remove the oil on the strip surface at the same time. Because the surface of the strip is corroded by oxidizing gas, the surface of the strip is formed, so the adhesion of the coating obtained by the Sharon method is especially good. However, due to the serious corrosion of equipment, the cost of equipment maintenance and renovation is very high. Therefore, this method is rarely used.

(5)改良森吉米

(5) amelioration of Jimmy

它是一种更优越的热镀锌工艺方法;它把森吉米尔法中各自独立的氧化炉和还原炉由一个截面积较小的过道连接起来,这样包括预热炉、还原炉和冷却段在内的整个退火炉构成一个有机整体。实践证明,该法具有许多优点:优质、高产、低耗、安全等优点已逐渐被人们所认识。其发展速度非快,1965年以来新建的作业线几乎全部采用了这种方法,近年来老的森吉米尔机组也大都按照此方法进行了改造。

It is a better process for hot-dip galvanizing; it connects the independent oxidizing furnace and reducing furnace in the sun's method to a small cross section, which consists of an entire annealing furnace, including a preheating furnace, a reducing furnace and a cooling section. Practice has proved that this method has many advantages: high quality, high yield, low consumption and safety have been gradually recognized by people. The speed of its development is not fast. This method has been adopted almost all of the newly built operation lines since 1965. In recent years, most of the old zir machine units have been reformed according to this method.



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