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Do you know the differences between stainless steel 201 (SUS201) and stainless steel 304 (SUS304)

SUS 304 is also refer as 18.8 stainless steel in the industry. It is now recognized as a healthy material because it can be used in medical treatment and implanted in the human body. For SUS304, the Ni element in its composition is very important, as it will directly determines the corrosion resistance of SUS304 and its value. The important elements in SUS304 are Ni, Cr, but are not limited to these two elements. The specific requirements are stipulated by the product standard. Common judgments in the industry consider that as long as the Ni content is greater than 8% and the Cr content is greater than 18%, it can be considered as SUS304. This is why the industry calls this type of stainless steel as 18.8 stainless steel.

SUS201 and SUS304 are the commonly used stainless steels in the stainless steel industry. SUS201 contains manganese, and the corrosion performance is general, long-term drinking water containing iron and manganese exceeds the standard can cause loss of appetite, vomiting, diarrhea, gastrointestinal disorders, stool disorders and other diseases. SUS201 color will be darker than SUS304, this is because SUS304 contains more chromium. Other than that, it has excellent corrosion resistance and better resistance to intergranular corrosion.  

Stainless steel vacuum flasks are generally available in SUS201, SUS202, SUS304 and SUS316. The two most common are SUS201 and SUS304. Although the materials are different, most stainless steel thermal flasks are produced by these two materials as they look the same. Usually, a normal person can not identify them. Even those who work in the stainless steel industry may not be able to distinguish between SUS201 and SUS304.

Although it is hard to distinguish them, but there are a few points you can judged them:

  • SUS304 has strong resistance to corrosion compare to SUS201
    The difference between SUS201 and SUS304 is mainly reflected in the different elements contained in them. The corrosion resistance and stamping performance of SUS304 are more far better than SUS201 and SUS304 is generally used in places with complex environment. SUS201 is not used for environmental requirements, or stainless steel is not required. Somewhere high. SUS304 thermal flask is not easy to rust because the formation of chromium-rich oxide on the surface of the steel body can protect the steel body, thus achieving the effect of healthy drinking water.

  • SUS201 is easier to rust compare to SUS304.
    SUS201 has high manganese content, the surface is very bright with dark light, and the manganese content is high and easy to rust. The SUS304 stainless steel thermal cup contains much more chromium, and the surface will be slightly darker and does not rust. When choosing a stainless steel thermal flask, you may take the cups and put together to compare them.

  • SUS304 is more expensive compare to SUS201.
    In terms of price, SUS304 will be more expensive compare to SUS201. This is due to the differences in materials.

  • SUS304 is more tough compare to SUS201.
    SUS201 material is relatively hard, with a bit of steel, it is easier to crack. The SUS304 thermal flask does not rust because it contains nickel, and the SUS304 is more tough and the fatigue resistance is much more better than SUS201.

In addition, judging from the material of the stainless steel thermal flask, there is also a misunderstanding, which is the word “stainless” of the stainless steel thermal flask. It also will rust under certain conditions, whereby if you improperly uses it for acidic drinks such as tea, coffee, milk and other acidic substances, it will naturally rust if it is used in an environment or condition that exceeds its corrosion resistance.

There are several possibilities for the stainless steel thermal flasks to rust:

  • The stainless steel material used is corroded and rusted. It might because of the manufacturer’s material selection is unreasonable, which is manufacturer choses unsuitable stainless steel grade as the raw material and proceed to produce them.

  • Or it may be that the manufacturer’s production and processing technology is not relevant.

  • Or it might because of the manufacturer of the thermal flask uses raw materials that are not in conformity with the relevant national or industry authority standards.


Relax®
is a team of local designers, marketers & product specialists with more than 12 years in making stainless steel thermal flasks, all our thermal flasks are guarantee made of SUS304. We come together with a common goal which is to create a brand with products of good quality & functional design at reasonable price which we are proud to share among our friends and families. Every inspirational quotes and messages showcased in our products represents our vision which is to inspire happy living and create an upbeat community.

Each of our bottle & flask represents:

  • Our promise to inspire a happier community through positive and educational messages embedded in our products.
  • Our commitment in continuous improvement towards better quality & safety.
  • Our dedication in product innovation.
  • Our pursue of aesthetic designs.

We believe in Real Quality, Reasonable Price.

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