Introduction of 304 stainless steel coil

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Introduction

Stainless steel products can be seen everywhere in our lives. And 304 Stainless steel coil is the base material of these products.

However, there are many models of stainless steel. Moreover, their performance and use are quite different. Besides, these models are difficult to distinguish with the naked eye.

Next, let’s get to know 304 stainless steel together.

304 stainless steel coil

What is 304 stainless steel coil?

304 stainless steel coil is the base material for 304-grade products. So, what is 304 stainless steel?

First, it is an iron-based alloy.

Moreover, its Cr content is at least 10.5%, carbon content is at most 1.2%, and nickel content is more than 8%.

Only in this way can we maintain the good corrosion resistance of 304 stainless steel.

Moreover, it can withstand high temperatures of 800 degrees. Therefore, it has no heat treatment hardening phenomenon.

What is 304 stainless steel?

However, relevant product standards have stricter regulations on 304.

Moreover, for different products and different shapes of stainless steel, this standard will have some differences.

In a specific product, to determine whether a material is 304 stainless steel, it must meet the corresponding standards of the specific product.

If you want to know the stainless steel coil, you can check on Stainless steel coil and its corrosion

Grade and marking of stainless steel coil

Regarding the grades of 304 stainless steel, people produce according to the American ASTM standard.

Moreover, commonly people mark 304 stainless steel with 06Cr19Ni10, 304 or SUS304 on the market.

Among them, 06Cr19Ni10 means that people produce 304 stainless steel in accordance with China’s national standard.

And 304, generally means that people produce 304 stainless steel according to ASTM standards.

Meanwhile, if it is SUS304, it means that people produce 304 stainless steel according to Japanese standards.

Next, let’s take a look at the production process of 304 stainless steel.

The production process of 304 stainless steel coil

People must ensure the performance of various stainless steel plates. Therefore, people will return the 304 stainless steel plate, solid solution, aging, and other heat treatment.

In addition to these, there are many more 304 stainless steel coil production processes.

Etching

People use screen printing to brush the acid-resistant protective film on the surface of the 304 stainless steel coil. Then, people etch it with ferrous chloride solution.

In this way, the surface of the 304 stainless steel coil has artistic patterns.

Moreover, the technological process is: stainless steel product → silk screen → etching → alkali treatment → oxidation colouring → finished product.

Spray color

After screen printing 304 stainless steel, people spray pigment particles on the surface of 304 stainless steel. And then, the pear skin pattern appears on the surface of 304 stainless steel.

Therefore, the above two methods increase the aesthetics of 304 stainless steel.

As for the technological process is: stainless steel product → silk screen → etching → alkali treatment → silk screen → oxidation coloring → alkali treatment → finished product.

These processes make 304 stainless steel have more forms and surface treatments than any other products.

Chemical coloring

People immersed 304 stainless steel coil in warm concentrated sulfuric acid Cr solution. In this way, 304 stainless steel can be colored.

Moreover, this process does not require paint or fuel. Therefore, the food utensils that people use it to make are safe.

Stamping

People stamp stainless steel in the most primitive way to form 304 stainless steel coil.

Moreover, there are two types of impact methods:

  1. People stretch and bend 304 stainless steel whose hardness is lower than 1/2.
  2. Another punching method is straight punching, which is used to punch 304 stainless steel with a hardness higher than 1/2.

So, what are the features of 304 stainless steel coil?

Features of 304 stainless steel coil

304 stainless steel coil is a general-purpose alloy with many advantages.

Let’s take a look at its main advantages.

Corrosion and oxidation resistance

Cr in 304 stainless steel coil has high chemical stability. Therefore, the corrosion resistance of 304 stainless steel coil is very good.

Moreover, Cr can form a passivation film on the surface of the steel to isolate the metal from the outside world. This protects the 304 stainless steel coil from oxidation.

Its advantage makes it have good corrosion resistance in the chemical, textile, petroleum and food industries.

High strength and light weight

304 stainless steel coil is non-magnetic in the annealed state. However, it becomes magnetic in the process of work hardening 304 stainless steel coil.

Therefore, heat treatment cannot change its organizational structure.

Moreover, this makes it both strong and light.

Therefore, half of the stainless steel in the United States is 304 grade.

Stretch ability

Because 304 stainless steel coil has high toughness, its work ability is very good.

People often impact, stretch, and cold work it to increase its strength and hardness.

Weld ability

Besides, people also cut and weld it to produce various parts. Moreover, people can weld 304 stainless steel well without using other fillers.

Provide multiple variants

The different contents of carbon and nickel mainly define different variants of the alloy.

For example,type 304L is a low-carbon. And it has welding characteristics.

As to type 304H is an advanced carbon variant of Type 304. People usually use it in occasions that need to improve mechanical properties.

In some cases, nickel content of 304 grade has also increased. And this makes the alloy softer and easier to form. So, it is usually beneficial for deep drawing processes.

Application of 304 stainless steel coil

Application in catering industry

Because the kitchen is a humid and oily environment, people hope that kitchen utensils are durable, corrosion-resistant, easy to clean and maintain.

Meanwhile, its materials cannot be harmful to the human body after heating.

Now,the 304 stainless steel is a national food stainless steel,

because 304 stainless steel has the following advantages:

1.304 stainless steel is an alloy of iron, carbon and Cr. This combination of elements makes it not easy to rust.

Moreover, the Cr oxide layer on the surface can protect the ingredients of the cookware from mixing into the food. So, this achieves a healthy diet.

  1. 304 stainless steel cookware has high hardness. So it is resistant to wear. Because people clean kitchen utensils frequently, the abrasion resistance of stainless steel makes its products more durable than other materials.
  2. When people use it with aluminum or copper, its thermal conductivity will be better. This is very suitable for cooking steak etc.

However, it is difficult to distinguish the difference between different types of stainless steel. Therefore, when buying stainless steel kitchenware, it is necessary to see whether its label is 304 grade.

Application in architecture

In buildings, people mainly consider the aesthetic appearance, the corrosive of the atmosphere, and the cleaning system of the building.

Meanwhile,the strong corrosion resistance and various variants of 304 stainless steel meet these needs.

Moreover, buildings in cities and villages need to maintain their clean appearance. Therefore, people clean them frequently.

Moreover, in heavily polluted industrial areas and coastal areas, the surface of buildings will be very dirty and often rusty.

Therefore, in these cases, the strong corrosion resistance and easy cleaning of 304 can well fulfill these needs.

Besides, people also widely use 304 stainless steel coil in auto parts, agricultural parts, ship parts, and storage.

So, will 304 stainless steel coil rust? The answer is yes.

Under normal circumstances, 304 has good corrosion resistance. However, in the following situations, 304 stainless steel  may also rust.

used in architecture

Reasons for rust of 304 stainless steel

The rust of 304 stainless steel may have the following reasons:

Chloride

There are a lot of chloride ions in salt, sweat, sea water, sea breeze, and soil.

Stainless steel corrodes quickly in the presence of chloride ions. In this respect, its corrosion rate is even faster than ordinary low-carbon steel.

Therefore, people should often wipe stainless steel products and keep them dry.

304 stainless steel inter-granular corrosion

During welding, 304 stainless steel will precipitate a small amount of carbides.

In some environments, this carbide can cause stainless steel to produce inter-granular corrosion.

Conclusion

304 stainless steel coil is the base material of its products.

And 304 stainless steel is an iron-based alloy. And, its Cr content is at least 10.5%, carbon content is at most 1.2%, and nickel content is more than 8%.

People still have a lot of methods to make it very beautiful.

  1. Etching
  2. Spray colour
  3. Chemical colouring
  4. Stamping

304 stainless steel coil is a general-purpose alloy with many advantages.

  1. Corrosion resistance and oxidation resistance
  2. High strength and lightweight
  3. Stretchability
  4. Weldability
  5. Provide multiple variants

Because of these advantages, people use it widely in various industries. For example, it is used as auto parts in the auto industry. The food processing industry uses it as cookware and thermos.

Moreover, it is used for roof and wall side panels in the construction industry.

Generally, speaking,stainless steel does not rust in most environments.

But when there are a lot of chloride ions in the environment, stainless steel will rust more easily. Therefore, people must always keep stainless steel products clean and dry.

Moreover, 304 stainless steel will precipitate some carbides during welding. These carbides will corrode it.

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