Understanding Surface States of Stainless Steel for Optimal Performance

Stainless steel has unique strength, high wear resistance, superior corrosion resistance and is not easy to rust.

Stainless steel materials are widely used in various industries: electromechanical, home appliances, 3C digital, manufacturing machinery, decoration, etc. Stainless steel has broad prospects for development.

At the same time, the application and development of stainless steel, to a certain extent, depend on the development of its surface treatment technology.

With the development of the industry and market, the demand for stainless steel surface is diversified and refined.

There are many kinds of stainless steel surfaces, and each has its own representation method.

What are the surface conditions of stainless steel?

Common stainless steel surfaces include 2B, BA, NO.1, NO.4, HL, etc.

The following is the stainless steel surface state and its representation method I have arranged.

NO.1 silver white, matte

Hot rolled to the specified thickness, annealed and descaled, a rough, matte surface, suitable for applications that do not require surface gloss.

NO.2D silver white

Heat treatment and pickling are carried out after cold rolling, and sometimes the final light rolling is carried out on the rough roll.

It is a kind of matte surface processing 2D product, which is used for the purpose of not strict surface requirements, general materials, and deep drawing materials.

The luster of 2B is stronger than that of NO.2D.

After the treatment of 2B, the final pass of mild cold rolling is carried out by polishing roller to obtain proper luster.

This is the most commonly used surface processing, which can also be used as the first step of polishing.

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BA is as bright as a mirror.

There is no standard, but it is usually bright annealed surface processing with high surface reflectivity.

It is commonly used in building materials, kitchen equipment, etc.

No. 3 rough grinding

Grind No. 1, 2B and other materials with 100-200 # (abrasive belt roughness unit) abrasive abrasive belt. It is often used for decoration, kitchen appliances, etc.

No. 4 intermediate grinding

Use 150-180 # abrasive abrasive belt to grind No. 1, 2B and other materials to obtain polished surfaces.

This is a generic, specular, bright surface with visible grains.

Stainless steel mirror panel is commonly used in mechanical equipment frame elevator car, various tanks, etc.

NO.240 fine grinding

The surface obtained by grinding materials such as NO.1 and 2B with 240 # abrasive belt.

NO.320 very fine grinding

The surface obtained by grinding NO.1, 2B and other materials with 320 # grinding belt.


NO.400 luster is close to that of BA and NO 2B material, general material is grinded with 400 # polishing wheel.

HL Hairline grinding

Abrasive materials with appropriate particle size shall be subject to hair grain grinding (150-240 #).

NO.7 is close to mirror surface grinding, and 600 # rotary polishing wheel is used for grinding. For art and decoration.

8K mirror grinding

Refers to the bright mirror state obtained by repeated grinding with polishing wheel.

For interior and exterior walls of special equipment, decoration, etc.

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