LONG PRODUCTS -U-Channel

Grade: This section lists various international steel grades:

• Q235: Chinese National Standard (GB) for carbon structural steel, with a minimum yield strength of 235 MPa.
• SS400 / SM490:
  • SS400: Japanese Industrial Standard (JIS) for general structural steel, with a tensile strength of 400-510 MPa.
  • SM490: Japanese Industrial Standard (JIS) for welded structures (rolled steels for welded structure), a higher strength grade compared to SS400.
• A36 / A572 GR.50: American Society for Testing and Materials (ASTM) standards.
  • A36: A common carbon structural steel.
  • A572 GR.50: High-strength low-alloy structural steel with a minimum yield strength of 50 ksi (approximately 345 MPa).
• S235JR/S275JR/S355JR: European Standards (EN) for structural steel. The numbers (235, 275, 355) indicate the minimum yield strength in MPa, and "JR" signifies that the steel has a minimum impact energy value at room temperature.

Size 1:

• 50*25*3*6mm — 125*65*5.3*6.8mm: This format is highly characteristic of channel steel (U-channels or C-channels). The dimensions typically represent:
  • First number: Height/Depth of the channel (e.g., 50mm to 125mm)
  • Second number: Flange width (e.g., 25mm to 65mm)
  • Third number: Web thickness (e.g., 3mm to 5.3mm)
  • Fourth number: Flange thickness (e.g., 6mm to 6.8mm) The range indicates channels from smaller dimensions (50mm height) up to larger ones (125mm height).

Size 2:

• 50*37*4.5mm — 400*102*12.5mm: This format could also represent channels, or potentially other structural shapes like I-beams or H-beams, but the specific naming convention (like web and flange thickness being separate for channels) makes channels a strong possibility. The dimensions might represent:
  • First number: Height/Depth (e.g., 50mm to 400mm)
  • Second number: Flange width (e.g., 37mm to 102mm)
  • Third number: Thickness (could be web thickness, or a general thickness if it's a simpler profile). Given the large range in the first dimension (up to 400mm), this likely includes medium to large structural channels or even smaller I/H beams.