Alloy steel round bar 4130 is a type of high-strength, low-alloy steel that contains chromium and molybdenum. It is commonly used in applications such as aircraft parts, oil and gas drilling equipment, and structural components.

The 4130 alloy steel round bar is known for its excellent weldability, toughness, and high tensile strength. It can also be heat treated to increase its strength and hardness.

The round bar is available in various diameters and lengths, and can be supplied in a range of conditions such as annealed, normalized, or hardened and tempered. It can also be machined easily and is often used in the production of complex parts.

When purchasing alloy steel round bar 4130, it is important to ensure that it meets the required specifications for your particular application. This may include specifications such as ASTM, SAE, or AMS. It is also important to purchase from a reputable supplier to ensure that you receive high-quality material.