45 steel plate is a widely used carbon structural steel, named for its carbon content of approximately 0.45%. This type of steel has high strength and wear resistance, making it suitable for manufacturing mechanical parts that need to withstand heavy loads and high - intensity conditions.

The standards implemented for 45 steel plate include GB/T711 or WTB. This steel also corresponds to different international standards, such as Japanese standard S45C, American standard 1045, and German standard C45.

The main chemical components of 45 steel plate include carbon (C: 0.42 - 0.50%), silicon (Si: 0.17 - 0.37%), manganese (Mn: 0.50 - 0.80%), as well as a small amount of phosphorus (P: ≤ 0.035%), sulfur (S: ≤ 0.035%). In addition, a small amount of alloy elements may also be contained, such as chromium (Cr: ≤ 0.25%), nickel (Ni: ≤ 0.25%), etc., but their contents are all controlled within a relatively low range.

According to the GB/T 699 - 1999 standard, the tensile strength σb (MPa) of 45 steel plate is ≥ 600, the yield strength σs (MPa) is ≥ 355, the elongation δ5 (%) is ≥ 16, and the reduction of area ψ (%) is ≥ 40. Its good comprehensive mechanical properties can be further improved in terms of toughness, plasticity and wear resistance after appropriate heat treatment.