This chromium-molybdenum alloy steel is known for its excellent strength, weldability, and ductility. Common applications include aircraft and automotive parts, as well as structural components in high-stress environments. A typical composition includes 0.28-0.33% carbon, 0.4-0.6% manganese, 0.8-1.1% chromium, and 0.15-0.25% molybdenum.
The balance of high strength and good ductility makes this type of steel ideal for components requiring both load-bearing capacity and resistance to cracking. Its weldability simplifies fabrication and repair, contributing to its widespread use in demanding applications. Historically, this alloy played a vital role in the development of reliable and lightweight aircraft structures.