We are a stainless steel factory with more than 25 years of production experience. Our SUS304 and SUS444 are very suitable for the production of household appliances, especially stainless steel water heater inner tanks.

ASTM A240 Material: Applications and Classifications

The application of stainless steel in stainless steel water heater


Yaoyi Stainless Steel is located in Ningbo City, Zhejiang Province, China where the traffic is very developed. The stainless steel we have produced can reach Ningbo Port in an hour to go to sea through the developed high-speed network. Besides, the developed sea and air transportation or railway transportation can provide you with cheap DOOR TO DOOR logistics.



We deeply realize that product quality is the most basic requirement. We have always been very confident in the quality of Yaoyi’s stainless steel belts. At the same time, we promise: If you are not satisfied with our quality, we can return the goods unconditionally.



According to international requirements, we package the finished stainless steel belts. If you have special requirements on the packaging, please let us know. We use non-steaming wooden pallets and wooden boxes to hold the stainless steel belt, and wrap the waterproof paper membrane at the same time. All of the above packaging is designed to prevent the watch seconds of the stainless steel band from damaging during transportation.



We provide customers with free burr-free cold-rolled stainless steel strip service. The steel belts produced by Yaoyi Stainless Steel have “safe edges” so as not to cut the operator’s hands. At the same time, we have 7 slitting machines, which can help customers to divide the stainless steel strip to the specified width. For example, the narrowest width we can cut is 1mm.



Yaoyi Stainless has an advanced laboratory. We will test the raw materials purchased on each roll. And we also do various tests for each roll of steel strip produced. If you request, we can do stainless steel composition test, hardness test, and tensile test for you free of charge. Not only that, but we also provide free salt spray tests, anti-fatigue tests, etc.


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AISI 304 2B: One Of The Most Commonly Used Stainless Steel


Yes, if it is a stainless steel water heater. Large home appliance manufacturers and power companies developed electric water heaters. It stores hot water in a hot water tank as a commodity for the next day by taking advantage of the fact that the electricity bill at night is lower than during the day time. However, until the development of high-performance gas water heaters, the power company made great progress on the active advertising activities.

Until now, many fully electrified houses are using it. The stainless steel water heater originally uses enamel to make. With the gradual increase of high-rise collective housing, in order to reduce the inconvenience caused by the weight of the enamel hot water tank, the research and development of stainless steel water heater have begun to achieve.

AISI 301 Stainless Steel Properties



Commonly, the stainless steel water heaters use SUS304 (18Cr-8Ni) to make. However, stress corrosion cracking occurred many times. After investigating the chloride ion concentration of tap water in various places, the most suitable ferritic stainless steel SUS444 (19Cr-2Mo-Ti, Nb-LC) with high corrosion resistance. Although ferritic stainless steel (like SUS444) prevented stress corrosion fracture is a perfect countermeasure.  However, sporadic crevice corrosion still occurs at the joints between the upper and lower heads of the hot water tank and the cylinder. In that way, it solved the problem of strengthening the welding quality and the management of the joint gap.



In addition, the too narrow assembly gap is the cause of crevice corrosion. Therefore, it is necessary to appropriately increase the assembly gap. There was an investigation of the inside of the recycled old electric water heater hot water tank.  Due to the use of 444 stainless steel (SUS444), there was almost no corrosion inside the hot water tank. However, due to other parts, damage and that causes many quality accidents. It is saying that the stainless steel of the electric water heater cylinder is the most suitable product for the “selection of functional materials”. The focus of stainless steel water heater: change from enamel to stainless steel (1) Improved handling and installation workability due to lightweight; (2) It can achieve a Large capacity without changing the outline size of the device; (3) Cleanliness.


AISI 301 Properties: Characteristics, Compounds, and Applications


Processing aspect: The upper and lower heads are using and stamping stainless steel sheet with a thickness of 1.0~1.2mm. The cylinder is 0.6~0.8mm, welded into a cylinder by TIG, and then the upper head is welded from the inside, and the lower head is welded from the outside. Considering the upper part of the water heater changes repeatedly between the gas phase. Also the liquid phase due to the change of the water level. Likewise, the chlorine concentration gradually increases, which is prone to corrosion. Therefore, most of the upper welds are welded from the inside. As mentioned earlier, it is worth controlling the gap between the lower head and the cylinder strictly.

Are stainless steel water heaters worth it?

Stainless steel electric water heater tanks will be more expensive than enamel materials, but it is worth it. Because it will not rust. As we all know, the water quality in many places is not good, because there are many impurities, it is alkaline. Over time, impure water and air will slowly corrode water heaters made of non-stainless steel. Therefore, if we use stainless steel to produce electric water heaters, its corrosion resistance is better, and in the long run, its economic benefits will be higher.


AISI 301 Equivalent: Components, Processing, and Applications