Overview of 304 stainless steel sheet

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Introduction to 304 stainless steel sheet

304 stainless steel sheet is a low-cost steel sheet with strong corrosion resistance.

Therefore, it has a wide range of applications.

Moreover, with the development of technology, it can have many different surface treatment effects.

So, what is 304 stainless steel sheet?

304 stainless steel sheet

What is 304 stainless steel sheet?

304 stainless steel sheet is austenitic stainless steel. Moreover, it is non-magnetic.

And people produce it according to American ASTM standards.

Its surface is smooth and clean, with high plasticity, toughness, and mechanical strength.

Meanwhile, its corrosion resistance is very high.

Therefore, it is currently one of the most popular and economical stainless steel.

And in chemical corrosive agents, industrial environments and marine environments, it can maintain good corrosion resistance.

304 stainless steel sheet has no magnetism in the annealed state.

Moreover, people cannot heat-treat it. Otherwise, it will harden quickly.

There is chromium-nickel in the 304 stainless steel sheet.

Moreover, there is still a small amount of carbon in it. Therefore, it has high corrosion resistance. So,It is an alloy steel that is not easy to rust. Meanwhile, it is very durable.

Moreover, the country recognizes it as food-grade stainless steel.

And stainless steel sheets include stainless steel sheets and acid-resistant steel sheets, in the form of sheets, coils and thin sheets.

How to make 304 stainless steel sheet?

People heat the stainless steel sheet to 1250 degrees.

Then, people keep them in the furnace for 2.5-3 hours.

At this time, people can put it on the 2250mm hot rolling mill.

Then, people rolled them to a thickness of no more than 3mm.

Solid solution pickling

After that, people started pickling stainless steel sheets.

Generally speaking, the temperature of pickling is 1050-1080 degrees.

solid solution picling

Testing the specification of the 304 stainless steel sheet

According to national standards, people have to inspect the finished 304 stainless steel sheets.

Then, people finish the steel sheet that meets the standard. And China’s standard is GB/T17102-1997 “Stainless Clad Steel Cold Rolled Sheet and Strip”.

Finishing

Before finishing, people need to clean the surface of the stainless steel sheet. And this can ensure that the surface of stainless steel is free of pits.

And if people want to explosively weld 304 stainless steel, people have to finish it twice.

People must ensure that the yield strength, tensile strength, elongation and hardness of stainless steel meet the requirements.

Therefore, before leaving the factory, people must perform annealing treatment, solution treatment and aging treatment on the steel sheet.

Cutting process

According to the standard size of stainless steel sheets, people cut 304 stainless steel sheets into 4-8 inches wide and 8-20 inches long.

Sometimes, people also cut the boards according to customized requirements.

In this process, people can cut with water jet, band saw, laser or plasma.

Among them, the plasma cutting method can cut thicker stainless steel sheets.

In order to prevent damage or scratches during handling and transportation, people put a PVC film on one side of the stainless steel sheet.

And this can provide temporary surface protection.

Therefore, it is generally recommended that people install the stainless steel sheet first, and then tear off the PVC film.

Manufacturing method of 304 stainless steel clad steel sheet

When people make 304 stainless steel, it includes the following steps:

People match two stainless steel sheets with a common carbon steel sheet.

Then, people group them according to the requirements of the final product.

In this way, people form a composite board.

People can weld steel bars around the composite board. Moreover, the thickness of welded ordinary steel bars is 6-8mm and the width is 60mm.

Then, people use a sander to clear the oxide or other impurities on the joint surface.

Next, people perform explosive welding.

And the order of welding is to weld the A-side composite board first, and then the B-side composite board.

Moreover, the area bonding rate between the reproduction and the substrate cannot be less than 99%.

If there is a defect in the surrounding area, people have to dig and repair it.

Then, people put the clad steel sheet on the hot rolling mill for rolling.

Moreover, the rolled thickness cannot be greater than 3mm.

After hot rolling, people carry out solution pickling on the steel sheet.

Finally, people finish the composite board.

manufacturing

Tips when making 304 stainless steel sheet

The surface quality of 304 stainless steel is mainly determined by the heat treatment process.

Therefore, when performing heat treatment, people should pay attention to the following points.

Remove the lubricating oil

During cold working, lubricating oil may adhere to the surface of the 304 stainless steel sheet.

In this case, people must put them in trichloroethylene degreasing agent, caustic soda solution.

Then, the stainless steel sheet is fully degreased.

At this time, people wash with warm water.

Then people can perform heat treatment again.

The thickness of the oxide scale should be uniform

If there are debris on the surface of the stainless steel sheet, heating will affect the oxide scale.

Sometimes, the oxide scale on the surface of 304 stainless steel is thick, or the structure is uneven.

However, people using pickling can not improve the surface finish and uniformity.

Therefore, the surface finish of the base metal under thick and thin areas is also different.

Besides, when pickling, the degree of corrosion of the matrix metal at the dissolution and attachment parts of the oxide scale is different.

Therefore, people should pay attention to surface cleaning before heat treatment.

Furnace temperature

The temperature difference in the stainless steel sheet furnace causes the temperature to be different in various parts of the stainless steel.

At this time, the formation of oxide scale will also change. Moreover, this is also the cause of unevenness after pickling. Therefore, when heating, the temperature of all parts in the furnace must be the same.

Dry the surface of the stainless steel sheet before use

Also, if the bricks, asbestos, etc. of the benches used by people contain moisture during heating, the moisture will evaporate.

Moreover, the part of the stainless steel sheet that directly contacts the water vapor will react with other parts of the gas.

Therefore, the formation of oxide scale varies from part to part.

And people must fully dry and heat the objects in direct contact with the workpiece.

However, if people dry it in advance, and then people put it in a room temperature environment, in the case of high humidity, moisture will still condense on the surface of the workpiece. Therefore, it is best to dry the surface of the stainless steel sheet before use.

The treated parts cannot touch the flame port during heating

Moreover, if the flame of air or oil directly touches the surface of stainless steel, the oxide scale produced will be different from the oxide scale produced in the non-contact area. Therefore, when heating, people must make the treatment part not directly touch the flame port.

Surface finish

Besides, if the surface finish of the stainless steel sheet is different, the roughness and fine scale on its surface are also different.

These will cause uneven surface of stainless steel after pickling. Therefore, people should pay special attention to the above points during heat treatment and pickling.

And if you have any other problems, just feel free to contact us.

Next, let’s take a look at the performance of 304 stainless steel surface.

Properties of 304 stainless steel sheet

There are many properties of 304 stainless steel. And let’s take a look at it together.

Corrosion resistance

The corrosion resistance of stainless steel sheet mainly depends on its alloy composition and its internal structure. And they have chromium, nickel, titanium, silicon, aluminum, manganese and so on.

Among them, chromium has high chemical stability.

Moreover, it can form a passive film on the surface of stainless steel.

And this passivation film can isolate the metal from the outside world.

Therefore, it protects the steel sheet from oxidation.

And this improves the corrosion resistance of the stainless steel sheet.

Therefore, it can maintain good corrosion resistance in chemical and atmospheric environments.

However, it is not absolutely rust-free.

In the high concentration of chloride, it is prone to corrosion.

Moreover, when the passivation film is broken, its corrosion resistance is reduced.

However, compared with other types of stainless steel, 304 stainless steel sheet has a higher chromium content.

So its corrosion resistance is better.

corrosion

High temperature oxidation resistance

Besids, even in high temperature environment, 304 stainless steel sheet has good oxidation resistance.

However, the environment and product form also affect the oxidation rate of stainless steel.

Mechanical performance

It is non-magnetic. Moreover, its tensile force and yield strength are relatively high. Therefore, people can use it to easily make the shape they want.

Moreover, it hardens quickly. Therefore, after moulding, people only need to let it cool in the air. And this reflects its high efficiency.

304 stainless steel sheet has low carbon content.

Therefore, during welding, the formation of carbide precipitation can be minimized.

In this case, the probability of intergranular corrosion of stainless steel during welding is very small.

Therefore, in most common welding operations, people like to use 304 stainless steel sheet.

Moreover, unless the specific application requires stress relief, generally people do not need to anneal the 304 stainless steel sheet after welding.

In addition, it also has excellent load-bearing performance and durability.

And, it also has enough resistance to thermal and electrical conductivity.

Aesthetic effect

The appearance of the 304 stainless steel sheet is delicate and beautiful.

Moreover, its details can also provide a high level of aesthetics.

Surface treatment type

In order to meet the aesthetic requirements of architects, people can make many different surfaces for 304 stainless steel sheets.

For example, shiny surfaces, matte surfaces, embossed surfaces, colored surfaces, electrosheetd surfaces or brushed surfaces.

Next, let’s take a closer look.

304 stainless steel sheet with No.4 surface treatment

People use 150 grit abrasives to achieve No. 4 wire drawing surface.

Moreover, people usually put a PVC film on it.

In this way, the PVC film can protect its perfect surface effect during handling and installation.

Moreover, its matte effect makes the environment more advanced.

304 stainless steel sheet with No. 8 surface treatment

No. 8 304 stainless steel sheet has high reflectivity.

Moreover, this makes it look like a mirror.

At the same time, it has 304 excellent performance.

Therefore, its acceptance range is also very wide.

No.8 stainless steel sheet

304 stainless steel sheet with 2B surface treatment

The surface of 2B is light gray.

Moreover, it is the most common product of 300 series stainless steel.

Because of its balance between corrosion resistance and work-ability.

People can see it in almost every industry.

Moreover, it does not require PVC film to protect its surface effect.

Therefore, its cost is relatively low.

304 stainless steel composite sheet

304 stainless steel composite sheet is a composite steel sheet made by bonding 304 stainless steel sheet and other steel sheets.

Moreover, the stainless steel composite panel is a new type of energy-saving and environmentally friendly material.

At present, China mainly uses direct explosion method to produce stainless steel medium and thick steel sheets.

At this time, the cladding of the composite board needs to be thicker.

Moreover, these composite steel sheets are mainly suitable for petrochemical, water conservancy, salt making and other fields.

Next, we take a look at the application range of 304 stainless steel sheet.

Application scope of 304 stainless steel sheet

304 stainless steel sheet has high corrosion resistance. Therefore, people can use it in harsh and chemical environments.

At this time, the corrosion resistance of other stainless steels may not be sufficient.

Moreover, it has good tensile strength and ductility.

Therefore, people can use it to make products of any size and shape they want.

In addition, 304 stainless steel has antibacterial properties.

Therefore, people often use it in medical and food processing.

Specifically, 304 stainless steel sheets are widely used in the following industries:

  1. Energy and heavy industry-oil and gas
  2. Electrical steel (silicon steel)
  3. Solar Panel
  4. Power Plant
  5. Heat exchanger
  6. Boiler
  7. Chemical storage container
  8. Automobiles and transportation
  9. Building construction
  10. Marine architecture
  11. Medical equipment
  12. Food machinery manufacturing, food and catering industry
chemical stainless container

Conclusion

304 stainless steel sheet is austenitic stainless steel.

Moreover, it is non-magnetic.

Therefore, even after welding, people do not need to return it.

There is chromium nickel in the 304 stainless steel sheet. Moreover, there is still a small amount of carbon in it.

Therefore, it has high corrosion resistance.

At the same time, it is very durable.

And when making 304 stainless steel sheets, people usually follow these steps: heating, rolling, pickling, inspection, finishing, and cutting.

As for its properties, its corrosion resistance and high temperature oxidation resistance are very good.

Moreover, people can weld or process it.

In addition, it can maintain a neat and beautiful appearance.

On the 304 stainless steel sheet, people can perform many surface treatments.

For example, No. 4 surface, No. 8 mirror, 2B type surface.

In addition, people can compose it into energy-saving and environmentally-friendly composite board materials.

Because of its good performance and low cost, it is already one of the most widely used stainless steels.

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