BS4360: British Standard for low and medium carbon structural steel

BS4360 is a British Standard for low and medium carbon structural steel that was published in 1968 and revised in 1990. The standard specifies the requirements for hot-rolled and forged steel bars, plates, and sections that are used in general construction, engineering, and structural applications.

BS4360 covers a wide range of steel grades, including:

• Grade 40A: This is a low carbon steel with a tensile strength of 410-560 MPa and a yield strength of 235 MPa.
• Grade 43A: This is a low carbon steel with a tensile strength of 430-580 MPa and a yield strength of 275 MPa.
• Grade 50B: This is a medium carbon steel with a tensile strength of 490-640 MPa and a yield strength of 355 MPa.
• Grade 55C: This is a medium carbon steel with a tensile strength of 550-700 MPa and a yield strength of 380 MPa.
• Grade 60C: This is a medium carbon steel with a tensile strength of 600-760 MPa and a yield strength of 420 MPa.
• Grade 65C: This is a medium carbon steel with a tensile strength of 650-820 MPa and a yield strength of 460 MPa.

The various grades of BS4360 steel are differentiated by their chemical composition and mechanical properties. They are commonly used in structural applications such as bridges, buildings, and construction equipment.