The difference between food grade 304 stainless steel and stainless steel

The differences between food grade 304 stainless steel and stainless steel are as follows:

1. High temperature resistance. Compared with ordinary stainless steel, 304 stainless steel has more high temperature resistance, and it can withstand temperatures up to 800 degrees. Ordinary stainless steel can be detrimental to withstand this temperature.

2. Anti-corrosion. 304 stainless steel is the most widely used kind of chromium-nickel, so its chemical properties are relatively stable, so in terms of anti-corrosion, 304 stainless steel has good anti-corrosion function.

3. High toughness. 304 stainless steel has the characteristics of good processing performance and high toughness, and in the production process, the good processability of stainless steel makes the product quality higher when producing products.

4. Lead content. The lead content of 304 stainless steel is less than that of ordinary stainless steel, so 304 stainless steel is often called food-grade stainless steel, and ordinary stainless steel contains more lead, which is harmful to the body, so it cannot be directly used as food utensils.

Food grade stainless steel has a much lower lead content than general stainless steel. Generally, 304 stainless steel is not food grade, and the specially processed one is food grade.

304 stainless steel is a very common stainless steel, which is also called 18 8 stainless steel in the industry. Its corrosion resistance is better than that of 430 stainless iron, corrosion resistance, high temperature resistance, and good processing performance, so it is widely used in industry, furniture decoration industry and food and medical industry.

Smelting stainless steel is usually smelted using scrap materials, so three elements like arsenic, cadmium, and lead are generally introduced in the raw material. These three elements will not be used in normal smelting, for example, the stainless steel produced by our factory is not produced according to food standards, and some customers require RoHS testing, and cadmium and lead have never been detected in all the samples we send for testing (RoHS does not detect arsenic), so as long as it is stainless steel produced by regular steel mills, it can generally be considered safe.

In daily life, we often see products made of food-grade 304 stainless steel, such as thermos cups, kettles, etc. Therefore, some customers will ask, is food-grade 304 our ordinary 304 stainless steel, and what is the difference between the two?

1. The content of harmful elements is not the same, and the content of harmful elements in food-grade stainless steel will meet the standard range stipulated by the state, and its lead and chromium content is much lower than that of general stainless steel. There are many harmful elements in 304 steel.

2. The use is different, food-grade 304 stainless steel is mainly used in the food industry, such as food containers, production of food equipment and equipment, etc. Ordinary 304 stainless steel has a wide range of uses, mainly in construction, industry.

3. The certification is not the same, food-grade stainless steel meets the relevant national standards certification, 304 steel is mostly used in industry, so there is no food-grade certification, but in order to maintain the inherent corrosion resistance of stainless steel, 304 steel must contain more than 18% chromium and more than 8% nickel content.

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The difference between food-grade stainless steel and food-grade 304 steel: 1. Certification of different food-grade stainless steel refers to stainless steel that meets the national standard certification and can really be in contact with food without harm, which is considered food-grade stainless steel. The so-called food grade of 304 stainless steel has not been certified by the national standard, while 304 stainless steel is widely used in industry, and the impact on the human body is unknown.

2. The difference between food-grade stainless steel and 304 stainless steel lies in the content of harmful elements contained in it. The content of harmful elements contained in food-grade stainless steel must reach a range lower than the national standard, while non-food-grade stainless steel is generally mainly used for industrial or civil, and there are more harmful elements. 3. Different uses: 304 stainless steel is a kind of general-purpose stainless steel, which is widely used in the production of equipment and parts that require good comprehensive performance.

In order to maintain the corrosion resistance inherent in stainless steel, the steel must contain more than 17% chromium and more than 8% nickel. Generally, 304 stainless steel is not food grade, unless it has been specially processed.

First, the certification is different.

Food-grade stainless steel refers to the stainless steel material that meets the national standard certification and can really be in contact with food without physical harm, the so-called food-grade 304 stainless steel has not been certified by the national standard, and 304 stainless steel is widely used in industry, and the impact on the human body is unknown.

Second, the content of harmful elements is different.

The main difference between food-grade stainless steel and stainless steel 304 is the content of harmful elements contained in it, the content of harmful elements contained in food-grade stainless steel must meet or lower than the range of national standards, while non-food-grade ones are generally mainly used for industrial or civil use, and harmful elements mainly contain sulfur, phosphorus, lead, chromium 6, etc.

Third, the use is different.

Food-grade stainless steel is mainly used for utensils that are in close contact with food, such as pots and pans, while 304 stainless steel is a general-purpose stainless steel, which is widely used to make equipment and parts that require good comprehensive performance (corrosion resistance and formability), in order to maintain the inherent corrosion resistance of stainless steel, steel must contain more than 17% chromium, more than 8% nickel content, generally 304 stainless steel is not food grade, special processed is food grade.

Food-grade stainless steel refers to the national mandatory standard GB ("National Standard for Food Safety|"National Standard for Food Safety").Metal materials and products for food contact"). First of all, GB 4806 has a definition of the selection range of stainless steel materials for the main part of tableware containers and food production and operation tools and equipment

Food grade stainless steel mandatory standard GB

At the same time, there are mandatory requirements for the physical and chemical indicators of heavy metal precipitation of selected materials

Food grade stainless steel mandatory standard GB

Therefore, 304 stainless steel is "not equal" to food-grade stainless steel. 304 stainless steel has a wide range of industrial uses, and most of them do not meet the standards of food-grade stainless steel. Food-grade stainless steel can be popularly interpreted as the need to meet both the category of ordinary stainless steel and the mandatory provisions of GB

Q: The inner wall of stainless steel products has a "food-grade 304 stainless steel" logo stamp, which must be food-grade stainless steel?

A: No! <>

Stainless steel kettle bottom logo stamp.

First of all, this kind of steel seal does not have the national legal efficiency nor the identification mark issued by an authoritative organization, but most of them are printed by enterprises for marketing and promotion purposes. In addition, 304 is an American brand, which should not and will not appear on China's product identification system.

Q: The stainless steel surface is wiped with paper, the paper turns black, can it be used?

A: No, you cannot! The blackening of the paper may be due to the presence of polishing wax on the surface of the stainless steel or the residue of a mixture of polishing wax and metal powder, which is a toxic substance that is poorly soluble in water.

Qualified stainless steel products will be cleaned up after the polishing wax before leaving the factory, polishing wax residual products can be identified as the manufacturer's quality control problems, usually inferior products, such products often appear as gifts. When encountering such products, do not touch the food in the mouth or throw them away.

Summary. Hello dear, 304 stainless steel is not all food grade.

Hello dear, 304 stainless steel is not all food grade.

The content of various chemical elements added to 304 stainless steel meets the national standard, and it is relatively safe when used in the food industry. This should be a point that the public generally agrees on, but not all 304 stainless steel is food grade, as just mentioned above, 304 is food grade, which is a wide range of general concepts, mainly referring to its ingredient content, and the real 304 that can be used in the food industry is not just a matter of content. The 304 stainless steel pipe made in the production process is only a decorative stainless steel pipe, which is mainly used in ordinary stainless steel pipe products such as anti-theft windows, stair handrails, guardrails, newspaper columns, etc., and the real food-grade 304 stainless steel pipe is also a pipe manufacturer with its professional production.

304 stainless steel pipes are classified as decorative pipes, food-grade pipes, and industrial pipes. Therefore, not all 304 stainless steel is food grade, food grade refers not only to the content of ingredients, but also to all aspects involved in the production process.