The steel thickness of internal surface is 6mm in order to resist the corrosion from salt water. Because the corrosion from outside is relatively small, the steel thickness of external surface is 3mm. In the middle, it is filled with polyurethane foam which has the function of heat preservation and its effect reaches 80mm.
Compared with the stainless steel, advantages of the steel which we treat after three anti-corrosive processes.
a.Price. With the same weight, the price of stainless steel is approximately 6 times of A3 steel. So with the same amount of money, buying power of 6mm A3 steel is same as 1.2mm stainless steel.
b.Welding Craft. The welding craft for A3 steel is electric welding. The structure force of electric welding point is much larger than the structure force of steel. When the brine tank is filled up with brine, there has no crack between welding points. Furthermore, the working life of steel which be treated in a special way is longer than 15 years.
While the welding craft for stainless steel is argon arc welding and the structure force of argon arc welding point is much less than the structure force of stainless steel. So when the brine tank is filled up with brine, there may exists cracks between welding points which led to brine leaking and speed up the welding points’ corrosion pace. And the small cracks cannot be found immediately and it must affect the product’s working life in a long term.
In addition, the welding strength of argon arc welding is not strong enough so that it cannot adapt to temperature change from brine. When brine’s temperature changes a lot in a short time, stainless steel will shrink or expand. Under such structure force changes, the welding point on stainless steel will gradually crack which led the whole brine tank losing working function.
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