4130/4140 steel plate refers to a type of low-alloy steel plate with great hardening and excellent toughness. Primarily composed of iron, chromium, and molybdenum. It is widely used in various industries due to its excellent strength, toughness, and versatility. The composition of 4130 steel typically includes approximately 0.30% carbon (4130), 0.40% carbon (4140), 0.80-1.10% chromium (4130/4140), 0.15-0.25% molybdenum (4130/4140), and other elements. Both 4130/4140 are utilized in most industry sectors for a wide range of applications including machinery parts, components, axles, molds, and shafts.