2b Отделка листа нержавеющей стали

2B finish SS sheet refers to stainless steel sheet with a smooth, matte cold-rolled surface produced through a specific annealing and skin-pass process. Among all stainless steel finishes, 2B is the most common standard surface for industrial stainless steel sheets, especially for grades such as 201, 304, 316, и 430.

The 2B surface is widely used because it offers a clean appearance, stable flatness, and good performance for further fabrication such as bending, сварка, полировка, and coating.

What Is 2B Finish on Stainless Steel Sheet?

2B finish is a cold-rolled surface treatment defined by ASTM and EN standards. It is created through a combination of:

• Холодная прокатка
• Термическая обработка (отжиг)
• Маринование
• Прокатка кожи

This process gives the stainless steel sheet a uniform gray-white appearance with moderate reflectivity, smoother than No.1 hot rolled finish but less reflective than BA finish.

How 2B Finish Is Produced

The production of 2B finish stainless steel sheet follows several key steps.

1. Холодная прокатка

The stainless steel coil is first reduced to the required thickness by cold rolling. This process improves dimensional accuracy and creates a relatively smooth surface.

Cold rolling also increases material hardness, so the sheet must be softened before final use.

2. Отжиг

После холодной прокатки, the sheet passes through an annealing furnace. The purpose is to restore ductility and remove internal stress caused by rolling.

The annealing process usually occurs at temperatures above:

During annealing, the microstructure becomes uniform, improving formability.

3. Маринование

After annealing, oxide scale forms on the surface. The sheet is then treated by acid pickling to remove oxidation layers.

Common pickling solutions include:

• Nitric acid
• Hydrofluoric acid

Pickling creates a clean metallic surface and removes heat tint.

4. Скин Пасс Роллинг

The final step is light cold rolling, also called skin pass or temper rolling.

Этот процесс:

• Улучшает гладкость поверхности
• Enhances flatness
• Reduces waviness
• Produces the final 2B texture

This is the core reason why 2B finish has a smoother appearance than ordinary annealed sheet.

Характеристики поверхности 2B Finish

2B finish is often chosen as the base material for further polishing, mirror processing, or PVD color coating.

Общий диапазон толщины

2B finish stainless steel sheet is typically available in thin and medium thicknesses.

Most 2B sheets are produced by cold rolling, so they are usually found in thicknesses below 6 мм.

Общие приложения

Because of its smooth and practical surface, 2B finish stainless steel sheet is widely used in:

Промышленное оборудование

• Химические резервуары
• Машинные панели
• Контейнеры для хранения
• Water treatment equipment

Строительство

• Interior wall panels
• Панели лифта
• Architectural cladding
• Потолочные системы

Пищевая промышленность

• Кухонное оборудование
• Food processing tables
• Refrigeration systems
• Dairy equipment

2B Finish vs Other Stainless Steel Finishes

Compared with BA finish, 2B finish is less reflective but more economical for fabrication.