Laigang's H steel has steel number, specification and size, batch number, and factory mark.

1. Steel number (or material grade): used to identify the material of the H-shaped steel. For example, Q235B means that the steel material is ordinary carbon structural steel Q235B.

2. Specifications: including height in two directions, waist panel thickness, waist panel width and flange width on both sides, etc.

3. Batch number: used to record the production information of this batch of H-shaped steel, such as production date, furnace number, rolling batch, etc.

4. Factory mark: used to identify H-shaped steel produced by Laigang, marked with Laigang's trademark or the name of the manufacturer, etc.