Stainless steel structures are what people commonly refer to as structural steel, such as H-beams, rail steel, I-beams, channel steel, angle steel, square steel, etc.

H-beams, often simply called structural steel, are steel profiles with an H-shaped cross-section. Because of their optimized cross-sectional area distribution and reasonable strength-to-weight ratio, H-beams are a preferred economical and efficient steel profile in structural construction. If you observe structural steel closely, you'll find that all parts are composed of right angles, giving them strong bending and torsional resistance in the lateral direction. Due to their simple structure, ease of production and installation, and light weight, they are widely used in industry and also extensively in commercial buildings. Structural steel is generally used in places subjected to high vertical forces, such as columns and supports.

As the name suggests, rail steel refers to the steel used in the tracks of trains, subways, and other transportation systems. Its shape is wider at the bottom and narrower at the top to increase stability and facilitate fixing. Rail steel is typically distinguished by its weight per meter (in kilograms). It is divided into heavy-duty rail steel and light-duty rail steel. Its cross-sectional shape somewhat resembles the Chinese character "工" (gōng) in calligraphy, but the top horizontal stroke is much shorter than the bottom one, with both strokes extending from the middle outwards.

The cross-section of an I-beam is a complete "工" shape, hence the name. Furthermore, the flanges of an I-beam gradually thin from the root towards the edges, forming a specific angle. The specifications for ordinary and light-duty I-beams are expressed by multiplying the web height by the flange width and then by the web thickness. I-beams can also be designated by model numbers, such as 16#, 20#, and 25# I-beams, meaning their web heights are 160mm, 200mm, and 250mm, respectively. However, I-beams with the same web height may have different flanges, making them indistinguishable. National regulations stipulate that different flange thicknesses are indicated by adding "a," "b," or "c" after the model number. I-beams are generally used in bridges, crane rails, beams, and other applications subject to high shear forces.

Channel steel has a cross-sectional shape resembling two halves of the Chinese character "口" (kou), much like a traditional pig trough. Don't underestimate channel steel; it has many uses! Channel steel can be used to fix structural steel sections and to secure sections to sections, I-beams, and other I-beams. Furthermore, in ductwork manufacturing, it can be used for fixing and supporting ducts or as a reinforcing rib. Due to its relatively light weight and low production cost among structural steels, channel steel is widely used and has always been a favorite in the industry.

Angle steel, as the name suggests, has a right-angle cross-section. However, angle steel is divided into equal-sided angle steel and unequal-sided angle steel, so it is always represented by a ratio of angle X to angle Y. Angle steel, commonly known as angle iron, is frequently used in the construction of various structural supports, such as brackets and hangers.

Square steel is steel with a square cross-section. Square steel is divided into welded and seamless square steel. Welded square steel is made by welding steel plates, while seamless square steel is made by cold-drawing seamless tubes. Seamless square steel has better mechanical properties than welded square steel, but its manufacturing cost is higher.

The combination of various types of steel has created countless industrial miracles, but these structural steels are only the tip of the iceberg in the application of stainless steel profiles.