Which is better, 316 material or 304 material for the inner liner of the thermos cup

304 is more cost-effective, 316 is better quality. The American Iron and Steel Institute uses three numbers to mark the various standard grades of malleable stainless steel. The common 200 and 300 series belong to austenitic stainless steels (ASTM standard) and include 304 and 316, as well as 201 and 430, which are not suitable for thermos cups.

It is designated as a "food grade" metal by the national standard, with good corrosion resistance, toughness, high temperature resistance of 800, and service temperature of -196 800. The most important elements in its composition are Ni>8% and Cr>18%. Widely used in corrosion-resistant containers, tableware, fixtures, medical equipment, etc.

This ingredient is also used in most common kitchen utensils such as wok and soup pot at home.

316 stainless steel thermos cup is better, because 316 stainless steel corrosion resistance and heat resistance are higher, 316 stainless steel due to the addition of molybdenum elements, its corrosion resistance, heat resistance will be higher, generally can withstand 1200 1300 degrees of high temperature, even in very harsh conditions are also used freely.

304 stainless steel is a versatile stainless steel material. The high temperature resistance is also relatively good, and the general use temperature limit is less than 650. 304 stainless steel has excellent stainless corrosion resistance and good intergranular corrosion resistance.

304 and 316 are both austenitic stainless steels, with the difference that 316 has 2% more molybdenum added. In this way, the corrosion resistance of 316, especially the chlorine ion corrosion resistance, is better than that of 304, and it is about 20% more expensive.

Directions for use:1. Before using the new product, it must be scalded with boiling water (or add some edible detergent several times for high temperature disinfection. 2. Before use, please preheat (or precool) with boiling water (or cold water) for 5-10 minutes to make the insulation effect better.

3. Please fill the water in a hurry to avoid scalding from the boiling water when the lid is tightened.

4. Please drink slowly when drinking hot to avoid burns.

5. It is not suitable to hold carbonated drinks such as milk, milk products and fruit juice for a long time.

The above content refers to Encyclopedia - Thermos Cup.

It is better to choose 316 stainless steel thermos mug because of higher corrosion resistance and heat resistance.

Due to the addition of molybdenum elements, 316 stainless steel has higher corrosion resistance and heat resistance, and the general high temperature resistance can reach 1200 1300 degrees, even under very harsh conditions, it can be used freely. The 304 stainless steel high temperature resistance is only 800 degrees, even if the safety performance is good, but the 316 stainless steel thermos cup is slightly better.

In addition, 316 stainless steel is used in the food industry, medical equipment, etc. The 304 stainless steel is mostly used in kettles, thermos cups, tea strainers, tableware, etc., and can be seen everywhere in home life. In contrast, it is recommended to choose a 316 stainless steel thermos mug.

Precautions for the selection of thermos cups

First, buy through formal channels and try to choose products from well-known brands. Consumers should pay attention to check whether the manual, label and product certificate are complete when purchasing, and avoid buying "three no products".

Second, check whether the product is labeled with its material type and material composition, such as austenitic SUS304 stainless steel, SUS316 stainless steel or "stainless steel 06CR19NI10" and other words.

Third, open the thermos cup and smell it. If it is a qualified product, because the materials used are food grade, there will generally be no peculiar smell.

Fourth, touch the mouth and liner with your hands, the inner tank of the qualified thermos cup is relatively smooth, while the inferior thermos cup feels rough due to material problems.

Food grade, 316 medical grade.

The biggest difference between the two and 304 is that 316 stainless steel has an extra molybdenum (MO), which is a rare metal, so this is why 316 stainless steel is more expensive.

The appearance is relatively bright, the density is large, the thermal conductivity is not very strong, and it is relatively corrosion-resistant; Whereas, 316 has strong corrosion resistance.

Small plates and small bowls of stainless steel, used to hold some lemon juice, vinegar and coffee and other slightly corrosive things, these seasonings will emit a rusty taste, which is caused by the reaction between our stainless steel and the liquid inside, and 304 stainless steel will not rust over the years when carrying other foods, but once it is in contact with the liquids we just talked about, it will greatly reduce the service life. 316 stainless steel has different compositions, so the corrosion resistance is also very strong, and the service life is long, and the quality is also very strong.

Thermal insulation is good with 316.

Regardless of the ** factor, although 316 and 304 are both food-grade stainless steels, overall 316 has superior performance for the following reasons:

1.Main constituents.

The chromium content of 304 and 316 is about the same, there is not much difference, the main difference is the nickel content of the two, 304 is generally 9%, and 316 is 12%, the difference is still relatively large, and this nickel determines the heat resistance and mechanical properties and oxidation resistance of stainless steel, so 316 is better than 304.

2.Corrosion resistance.

Although 304 and 316 both have excellent anti-corrosion performance, 316 is higher than 304 in density, so both anti-corrosion performance and high temperature resistance are better than 304, and can be used in various harsh environments, which will be safer.

3.Cost**.

Many people have found a phenomenon, that is, the 316 stainless steel products sold on the market are higher than 304 stainless steel products, that is because their costs are different, 316 is higher than 304, so 316 sales ** are naturally higher.

Thermos mug

Vacuum cup is generally made of ceramic or stainless steel plus a vacuum layer to hold water, the top has a lid, sealed tightly, vacuum insulation layer can make the water and other liquids installed inside delay heat dissipation, in order to achieve the purpose of heat preservation. The thermos cup is developed from the thermos flask, and the insulation principle is the same as the thermos flask, but people make the bottle into a cup for convenience.

There are many layers in the thermos cup, and its interlayer is generally vacuum to prevent heat conduction! It is then plated with silver, which blocks the heat radiation. Some cups have cork stoppers on their lids, also to prevent heat conduction.

The appearance is smooth and odorless, and after pouring boiling water, a thermos cup with no heat sensation in your hand can be called a good cup.

The above content reference:Encyclopedia - Thermos cup

304 is more cost-effective, 316 is better quality.

The most common materials on the thermos cup are 304 stainless steel and 316 stainless steel, but in fact, there is a more common stainless steel grade, but the manufacturer generally does not mark it: 201 stainless steel.

The stainless steel thermos mug has at least two layers, one with an inner tank and one with an outer shell. No matter what material the liner is made of, the shell is generally 201 stainless steel. It has the advantage of being cheap and sturdy. The disadvantage is that it is easy to corrode, so there is often a layer of plating or paint on the shell.

304 stainless steel or 316 stainless steel, there are two differences:

Stainless steel is more resistant to corrosion, so if you often use a cup to make drinks (milk, coffee, etc.), it is recommended to choose 316 stainless steel. As for the tea leaves, the corrosion of stainless steel is relatively small. Therefore, whether it is tea, flower tea, or fruit tea, it is enough to choose 304 stainless steel.

Stainless steel is more expensive than 304 stainless steel, but the hardness is softer than 304 stainless steel. Therefore, although 316 stainless steel has strong corrosion resistance, it is not recommended to use it as the first choice. Again, don't make milk tea and coffee in a cup, there is no need to buy a 316 stainless steel cup for the root hood type.

In addition, when looking at the material of the cup, you may also see 304L or 316L. The grade has an "L" on it, which refers to the low carbon content in stainless steel. It has the advantage that it can avoid intergranular corrosion during welding, and it is not necessary to understand what intergranular corrosion is, just to know that this phenomenon will cause the weld to be not strong.

316 stainless steel thermos mug is good.

316 stainless steel thermos mug is better than 304 stainless steel thermos mug. Fortunately, it is mainly determined by the material of 316 stainless steel.

304 stainless steel thermos cup and 316 stainless steel thermos cup are good first 304 stainless steel and 316 stainless steel have their own good, 304 stainless steel is commonly used stainless steel, with good corrosion resistance, high temperature performance; **Relatively speaking, it is also relatively cheap, and it is recognized by the majority of consumers.

Identification methods

The quality of thermos cups on the market is uneven, how should ordinary consumers identify it? Industry insiders suggest that we should pay attention to the thermal insulation performance of its inner tank structure, the sealing degree of the cup lid and bottle body, and whether the material releases harmful substances, etc., which can be identified through four tricks.

Trick 1 Liner heat preservation identification This is the main technical index of the thermos cup, after filling with boiling water, tighten the cork or cup lid clockwise, and touch the outer surface and lower part of the cup body with your hands after 2 3 minutes, if you find that the upper part of the cup body and the upper part of the cup body has obvious warm phenomenon, it means that the inner tank has lost its vacuum degree and can not achieve a good thermal insulation effect.

316 stainless steel thermos mug is better.

Most of the common stainless steel products in life are 304 stainless steel.

For example: kettles, tea strainers, etc., 304 stainless steel has a density of g cm3 and a high temperature resistance of 800 It is widely used in the food and medical industries.

Therefore, the safety performance of 304 stainless steel is still good, and 316 stainless steel adds MO elements, and the corrosion resistance and high temperature resistance are better than 304 stainless steel.

The 316 thermos cup has a seamless difference, mainly in the production process, but it does not have much impact on its warmth.

The seamed thermos cup uses the seam welding stretching technology, while the seamless thermos cup adopts the integral stretching forming technology.

In terms of cost, the seam thermos cup is more material-saving, the cost is lower, and aesthetically speaking, the seamless thermos cup is made after several adjustments, and the weld can not be seen, which is very beautiful, but the seam seamless has no great impact on the warmth of the thermos cup.