Flat steel is a commonly used metal material with a wide range of applications. Mainly applied in the following fields:

1. Construction field: Flat steel can be widely used as a building material. In building construction, flat steel can be used as staircase handrails, door and window frames, wall supports, etc. In steel structure buildings, flat steel can be used as frame supports, beams and columns, etc.

2. Mechanical manufacturing: Flat steel can be used as a material for machine components, such as machine shafts, gears, couplings, bearings, etc. The high strength, compressive strength, and wear resistance of flat steel make it widely used in the field of mechanical manufacturing.

3. Transportation: Flat steel can be used to manufacture components for large transportation vehicles such as trucks and railway vehicles. Meanwhile, flat steel can also be used in the construction of bridges as materials for bridge decks, beams, and columns.

4. Agricultural machinery: In the field of agricultural machinery, flat steel is also widely used. Flat steel materials are often used in mechanical components such as tillers, harvesters, seeders, and tractors.