How to identify high quality stainless steel protective gloves

Stainless steel protective gloves? , I don't understand, can you introduce it?

Hello! I am Shangyu City Siwei gloves, my company is a professional glove manufacturer.

You are engaged in the food industry, it seems that you are very responsible for quality, I wish you a prosperous business.

When choosing gloves, especially in some special industries, I personally think that you don't have to choose the cheapest, because ** is proportional to the quality, and you get what you pay for.

You can go to a regular company to consult and buy.

Chemical protection gloves, protective gloves, labor protection gloves.

Please click here for details. Tel: 021-64608255 56 57 (Shanghai) 022-27279991 (Tianjin).

Protects against a wide range of chemicals. When they protect against specific chemicals, they also prevent microscopic injuries caused by other liquids, as these gloves have a permanent diaphragm that prevents even non-harmful liquids from penetrating. Many chemical protection gloves are also available to resist abrasion, cuts, punctures, and tears.

The purpose of the gloves depends on the material used.

Shanghai Fuyou is a company specializing in the production and sales of safety protection products (PPE), with thousands of PPE products to meet your needs at different levels. The company applies rich industry experience and professional knowledge to provide you with technical, first-class, delivery and other consulting services in a timely manner.

Foyou**: 3M in the United States, BACOU (Sperian) in France, North in the United States, MSA in the United States, Delta Plus in France, Ansell in the United States, Beddy Brady in the United States, Kimberly-Clark KCprofessional in the United States, Master in the United States and many well-known domestic brands.

We will provide you with perfect pre-sales and after-sales service and the most cost-effective products at the fastest speed and the most professional level.

FOYOU chemical protection gloves material types: nitrile rubber, neoprene, fluorinated rubber, butyl rubber, composite film, mixed material, polyvinyl chloride (PVC), polyvinyl alcohol (PVA) chemical protection gloves.

Scope of application: chemical production, processing and handling, chemical refining, automobile, aviation manufacturing and aerospace industry, pharmaceutical industry and laboratory, paint and paint factory work, mining industry, construction industry, printing industry, etc.

It is sold in Tianjin, Beijing, Shanghai, Guangzhou, Shenzhen, Shenyang, Changchun, Harbin, Qingdao, Chengdu, Chongqing, Xi'an, Suzhou, Nanjing and other places.

1. Magnetic detection.

You said that stainless steel is magnetic, and that's right! It's not magnetic, and it makes sense! In fact, it is fundamentally different, we all know that stainless steel is divided into austenitic stainless steel and ferritic stainless steel.

Among them, austenitic stainless steel is non-magnetic, while ferritic stainless steel is a strong magnetic steel body, through a series of experiments to prove that austenitic stainless steel will have no obvious magnetic production under certain special conditions, but it is not magnetic under normal circumstances.

2. Conduct nitric acid point test.

Many times 200 series, 300 series, 400 series and other types of stainless steel are difficult to distinguish with the naked eye, through the nitric acid point test to test the corrosion resistance of the substrate is the most intuitive test method, usually 400 series will only be slightly corroded when the test is carried out, and the 200 series stainless steel with the lowest corrosion resistance will have obvious traces of corrosion.

3. Passed the machining test.

If the tested stainless steel is shaft type, it is recommended to take it to an ordinary lathe or CNC lathe for machining inspection, but there are still limitations, this method is only suitable for free-cutting steel grades and standard stainless steel grades, such as F, 430F, 440F, by the shape of the chip to identify the type of steel grade, this kind of easy-to-chip steel grade will emit an unpleasant odor when turned in a dry state.

Factors affecting stainless steel.

Regardless of stainless steel plate or heat-resistant steel plate, austenitic steel plate has the best comprehensive performance, which has sufficient strength, excellent plasticity and low hardness, which is also one of the reasons why they are widely used. Austenitic stainless steel is similar to most other metal materials, its tensile strength, yield strength and hardness increase with the decrease of temperature; Plasticity decreases as the temperature decreases.

Its tensile strength grows relatively uniformly in the temperature range of 15 to 80 °C. What's more: As the temperature decreases, the impact toughness decreases slowly, and there is no brittle transition temperature.

Therefore, stainless steel can maintain sufficient plasticity and toughness at low temperatures. The heat resistance of stainless steel refers to the thermal stability of both oxidation resistance or gas medium corrosion resistance at high temperatures.

The easiest thing to do is to suck it up with a magnet.

Just see if it's rusty, get some water, don't dry it and put it outside, and see if it's rusty overnight.

It is indeed not easy to distinguish between high-quality stainless steel and ordinary stainless steel, and it is difficult to figure out the amount of chromium and nickel contained in the absence of a laboratory. However, we often use a local method to "eliminate" inferior stainless steel, that is, to use a magnet (not a strong magnet) to try to suck it. Food-grade 304 stainless steel contains about 18% chromium (Cr % nickel (Ni), so it cannot be attracted with magnets.

The inferior stainless steel contains less chromium and nickel, that is, it contains more iron elements, and of course it can be attracted by magnets. You might as well give it a try, and if you can't absorb it, at least it proves that it is not inferior stainless steel.

It is difficult for individuals to accurately identify stainless steel, and can only roughly determine which category stainless steel belongs to through experience or a small number of means. For example, if a stainless steel identification solution is applied to stainless steel, the identification solution will be based on a certain of the stainless steelaThe composition (more than one component of stainless steel) changes in different colors, and the type of stainless steel can be roughly judged based on the color change. But it will not be accurate, and can only be used as a distinction between a fewKnownStainless steel basis.

As for whether it is food grade, you can only look at the factory information. BecauseThe requirements of food grade are not related to the material (e.g. stainless steel) or grade (e.g. 304).。The screenshot below is the content of the National Standard GB National Food Safety Standard Metal Materials and Products for Food Contact on confirming food grade and food grade materials.

GB National Food Safety Standard General Safety Requirements for Food Contact Materials and Products" requires the product information to be labeled.

Don't be fooled again! For your health, teach you how to distinguish food-grade stainless steel jugs.

The so-called 304 is obtained from the standard of the United States, usually used in machinery, so it can not be used for food grade, to the domestic usually this standard, the domestic food grade stainless steel standard must be printed with GB9684 is food grade stainless steel, simply put, GB9864 stainless steel = food grade stainless steel, 304 stainless steel ≠ food grade stainless steel.

(1) Magnetic angle. 201 has a certain magnetism, but the magnetism is not good; 202 is virtually non-magnetic; There is absolutely no magnetism on 304 and 316; The 4 series are all magnetic, and they are very magnetic. The reason why the 2 series is magnetic is because most of the 2 series stainless steel is the first material to be recycled, we call it the reverse binding material, the elements contained in it are not pure, and the cost of the reverse binding material is only equal to 1 2 of the first-class material.

Therefore, it is possible that food-grade stainless steel is completely non-magnetic, that it is toxic if it is weakly magnetic, and that it is also safe if it is strong magnetic. (2) The difference between materials and materials. In series 2 stainless steels, martensitic, high manganese alloys.

It is characterized by cheap raw materials, moderate and low precipitation of heavy metals, and ordinary plasticity; In series 3 stainless steels, austenitic, chromium-nickel alloys; It is characterized by high raw materials, no precipitation of heavy metals, good plasticity, 304 for cooking and 316 for medical use; In the 4 series stainless steel, ferrite, carbon alloy. It is characterized by the fact that the pot with 430** is relatively cheap, the shaping is relatively poor, and the magnetism is very good, but it is a healthy metal and will be embroidered in an alkaline environment. With the exception of 430, the 4 series is mostly used for knife steels and other applications, because the hardness is higher than that of the series stainless steels.

The National Safety Standard for Stainless Steel Products requires that the type of stainless steel and the words "for food contact" should be marked on stainless steel products or minimum sales packaging to protect consumers' right to know, right to choose and right to supervise.

Zhu Yi, an associate professor at the College of Food Science and Nutritional Engineering of China Agricultural University, introduced that there is a certain proportion of chromium and nickel in stainless steel, and the chromium content is above to be called stainless steel, and the chromium content reaches 18% and the nickel content is 8% stainless steel, that is, "18-8" (304 steel) has the ability of stainless steel utensils to resist corrosion and rust, which needs to look at the type marked on the stainless steel.

Whether stainless steel utensils are safe or not is mainly the problem of heavy metal migration, "the key is whether stainless steel utensils are worthy of the name of qualified stainless steel, if so, they can be used to make tea." Zhu Yi said that 304 steel is better, and such a stainless steel cup can be used to make tea with confidence.

In addition, experts remind that when buying stainless steel products, you can look at the product number, such as "18-8" (304 steel), "18-0" (430 steel), etc., the number in front of the horizontal line indicates the chromium content, and the nickel content after the horizontal line. Generally speaking, the common 304 steel on the market now has less chromium migration, so stainless steel products made of 304 steel can be preferred.

The food-grade is 304, but if you look at the appearance, you can't see it.

In the absence of precision stainless steel pipe testing tools, we can first see whether there is a steel stamp on the purchased pipe, and generally the material of the pipe containing the corresponding steel stamp is credible. For pipes without stamps, there are several ways to identify:

1. Find a magnet stone, because the better the pipe, the less attracted by the magnet, you can use this method to buy stainless steel pipes and stainless steel products.

Second, to have an experienced master polishing with an electric hand mill, you can identify whether it is a 304 pipe from the spark of stainless steel pipe grinding. Generally speaking, the sparks of 201 pipes are large, the sparks of 304 pipes are basically straight, and the sparks of 316 pipes are the straightest, and they are short.

Third, it can be identified by identifying the potion, referring to the instruction manual of the potion, which is the easiest test method and has great reference value.

The magnet is used to adsorb the stainless steel plate to verify its advantages and disadvantages. 304L stainless steel plate does not absorb and is non-magnetic, and is considered to be good, on the contrary, it is considered to be a fake. In fact, this is an unrealistic way to discern it.

There are many types of stainless steel, which can be divided into austenite type and martensitic or ferrite type according to the structure at room temperature. The 310S stainless steel plate austenitic type is non-magnetic or weakly magnetic, and the martensitic or ferritic type is magnetic. However, this is not necessarily the case.

For example, the austenitic 304 stainless steel plate material that is usually used for decoration tube sheet is generally non-magnetic, but magnetic may also occur due to the fluctuation of chemical composition caused by smelting or different processing states, which cannot be regarded as counterfeit or unqualified. Stainless steel pipe** In addition, 304 stainless steel is cold-worked, and the microstructure will also be converted to martensitis, the greater the cold-working deformation, the more martensitic conversion, and the greater the magnetism of the steel. On the other hand, the inferior quality of the 200 series stainless steel is likely to be non-magnetic, so it would be a mistake to judge that it is genuine.

How to choose stainless steel; Uses of high-quality stainless steel plates.

1. Before selecting the stainless steel plate, it is necessary to consider the use of the stainless steel plate and the use environment. For example, welded pipes are generally used for decoration, seamless pipes are generally used for fluid transportation, sanitary stainless steel plates are used for medical treatment or kitchens, and thick-walled pipes are used for pressure; Generally indoors.

200 series materials can be used, 304 and other materials need to be used outdoors, and 316 or more materials are generally used in acidic and alkaline places or coastal areas.

Second, when selecting steel pipes, it is necessary to make sure that the material meets the standards. Take the 304 material as an example:

1.From the analysis of **, if the 304 material stainless steel plate is even lower than the general ** of 301 material on the market, it is necessary to carefully distinguish that it is likely to be passed off from other materials;

2.Identify whether the word "304" is stamped on the pipe surface, and ask for the manufacturer's quality certificate as a certificate; 3.It can be tested with acidic reagents, and after 30 seconds, material 304 will not change color, and 201 will turn black;

4.Samples can be taken for large-scale purchase and sent to the national authoritative testing center for component testing.

3. Whether the color of the outer surface and the inner wall of the pipe is bright and smooth, and whether the thickness is uniform or rough. Generally, welded pipes do not need to be inspected, while seamless steel pipes are produced by cold-drawn or hot-rolled methods, and improper operation in the production process is easy to produce thickness.

The degree is uneven, there are cracks on the pipe surface, and the surface roughness is generally the seamless pipe is not polished, if there is no special requirement for the appearance, it will not affect the use. Fourth, the purchase should choose the excellent products assessed by the Quality and Technical Supervision Bureau. Testimonials and good reputation among customers are the most direct and effective ways to buy.

Fifth, there are often internal heavy skins, pittings, and rolled blue lines in the rolled pipe, which can not be avoided under normal circumstances, and basically do not affect the use, but must choose as little as possible when purchasing, especially to check the inner surface. Sixth, be sure to choose a big brand of stainless steel, such as Wuhan Tianshun. We can process the right product for your needs.