exterior the lines is hot rolled or chilly rolled metal sheet1628scribd

7/28/2019 Exterior the Lines is Hot Rolled or Chilly Rolled Metal Sheet1628scribd

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Annealing: exterior the lines is hot rolled or chilly rolled metal sheet

Annealing: exterior the lines is hot rolled or chilly rolled metal sheet prior to getting into the hot

galvanizing line, initial type annealing furnace from the base of the suction or bell type annealing

furnace of recrystallization annealing, in this way, galvanizing line there is no annealing approach.

Before hot dip galvanized metal have to be held in a clear without having oxide and other grime

floor of pure iron. This technique is to initial by pickling technique to eliminate the floor oxidation of

iron right after annealing, then coated with a layer of zinc chloride or ammonium chloride and zinc

chloride combined solvents for defense, to stop the oxidation of the metal plate to be.

1 wet hot dipped galvanized, metal plate on the floor of the solvent without having drying (that is,

the floor is wet) into a floor covered with molten solvent liquid zinc galvanizing. The draw back to

this technique is:

A. can only in the condition of direct-totally free galvanizing, plating alloy layer is really thick and

adhesion is really negative.

B. developed zinc slag generated at the interface in between zinc and direct liquid instead than

deposit of pan (since the proportion of zinc slag is greater than the liquid zinc and direct is

considerably less than the liquid), so that metal plate thanks to the polluted floor through the zinc

layer. For that reason, this technique has been largely eliminated.

2 the one plate: this technique is generally adopted hot rolled pack rolling plate as uncooked

materials, initial despatched right after annealing of metal pickling workshop, with sulfuric acid orhydrochloric acid cleansing technique of oxygen on the floor of the metal plate galvanized iron

sheet. Pickling right after soak for galvanized metal plate immediately into the drinking water tank,

so that we can stop metal reoxidation. Following acid cleansing, drinking water cleansing, drying,

baking, in zinc pot (temperature has been preserved in 445-465 hot dip galvanized, and then to oil

and chromium. This way the manufacturing of hot galvanized sheet specific humidity technique

galvanized concluded solution good quality has enhanced substantially, only for small-scale

manufacturing has a specified price.

3 HuiLin hot: the ongoing galvanizing line including alkali degreasing, hydrochloric acid pickling,

washing drinking water, solvent coating, drying and so on a sequence of pretreatment approach,

and the unique plate into galvanized in the galvanizing line is needed prior to the bell type

annealing furnace. This technique complex manufacturing approach, manufacturing value is

higher, Polyester Forming Fabrics the much more the primary problems frequently with solvent is

created by the technique of the solution, impact the corrosion resistance of coating. And zinc pot

of AL and solvent on the floor of the metal works often produce aluminium trichloride and eat,

coating adhesion is negative. So practically 30 many years, even though this technique has come

out but the galvanizing industry has not been in the development in the planet.

Inline annealing is made of chilly rolled or hot rolled workshop directly give the coil for hot dip

galvanized plate, gas in the hot galvanizing line defense recrystallization annealing. Galvanizing
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technique belongs to the course industries including:, Jimmy, Jimmy's technique, the enhanced

sen, metal union (with Japanese kawasaki technique) Silas technique Sharon technique.

Jimmy's regulation: it is the annealing approach and hot dip galvanizing approach collectively,

within its line of annealing furnace largely contain oxidation, reduction furnace composed of two

components. Strip in the oxidation furnace gas flame directly heated to 450 degrees or so, the

strip floor residual rolling oil is burned, clear floor. Once more right after complete the strip is

heated to seven-hundred-seven-hundred degrees of recrystallization annealing, the cooling area

of the management prior to getting into zinc pot temperature at 480 degrees, finally the air without

having touching the situation into galvanized zinc pot, as a result, Mr Jimmy, technique of

manufacturing is higher, the galvanized good quality is much better, this technique was widely

employed.

Metal union regulation: it's Jimmy's technique is a variation of it is to use only one particular

alkaline electrolytic degreasing degreasing tank replaced oxidation furnace, and the relaxation of

the approach, Jimmy's technique is fundamentally the identical. Following the unique plate into

the line, initial carries on the electrolytic degreasing, washing, drying, and then journey through

the reduction furnace with protecting gas recrystallization annealing, the very last in a sealed

situation into the pot hot dip galvanized zinc. This technique for strip without having oxidation

furnace heating, so the floor of the oxide movie is thinner, can lessen the reduction furnace

defense in hydrogen content of gases. So, very good for furnace safety and decrease the

manufacturing value. However, thanks to the strip into the reduction furnace without having

preheating, this without doubt improve the reduction furnace warmth load, impact the support

existence of the furnace. So this technique is not widely employed.

Silas technique: also acknowledged as direct flame heating technique Strip metal by alkaline

degreasing initial, and then use hydrochloric acid to eliminate oxide pores and skin on the floor of

the prior to and right after washing and drying to the gas flame directly heated vertical line

retreated within furnace, through rigid management in furnace gas and air flame burning charge,

in excessive gas and oxygen lack under the situation of incomplete burning flame, which result in

minimizing environment in the furnace. Make its rapid heating to recrystallization temperature and

at lower hydrogen cooling strip under protecting environment, and finally zinc immersion fluid in

an airtight situation, hot dip galvanized. The equipment is compact, lower investment decision

value, temporary fencing higher produce (up to 50 / hour). But complex manufacturing approach,

especially in the device quit working, in get to stay away from burning out the strip, the want to

use the stove transverse still left metal strip technique, so a lot of operation issues, so, hot dip

galvanized industry adopted are rare.

Sharon: Sharon organizations in the United States in 1939 and put into operation a new type of

hot galvanizing device, so also called Sharon. It is within annealing furnace injection hydrogen

chloride gas strip and strip metal is made to attain recrystallization temperature, so also

acknowledged as pickling approach gases. Making use of hydrogen chloride gas acid, not only

can eliminate the strip floor, and at the identical time, in addition to the strip on the floor of the oil

and gas corrosion, thanks to the strip floor oxidation to type pits, so using the shannon technique
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of coating adhesion. But thanks to the critical equipment corrosion, and the resulting higher

upkeep and update price. So this technique is rarely employed.

exterior the lines is hot rolled or chilly rolled metal sheet1628scribd

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