MQJM Steel CNC Machining for High-Precision Components

Known for its excellent machinability and formability, 1018 steel—often classified as low-carbon or mild steel—is a popular choice in steel CNC machining. It offers great performance in forging, welding, and bending, making it ideal for components that demand precise shaping or repeated forming. This steel grade is frequently used for manufacturing pins, shafts, spindles, and rods. Additionally, 1018 is compatible with surface hardening treatments like carburizing, which enhances its wear resistance without affecting core ductility.

4130 steel is classified as an alloy steel because it contains higher levels of chromium and molybdenum compared to standard mild steels. Known for its exceptional strength and toughness, this material is also easy to machine and responds well to various heat treatment methods. Its excellent hardenability and fatigue resistance make it ideal for precision custom steel parts subjected to high stress. Common applications include aircraft engine mounts, cutting tools like taps and drills, and other high-performance structural CNC steel parts.

4140 steel is a low-alloy steel that offers improved performance over 4130 due to its higher carbon content. This enhanced chemical makeup increases its tensile strength, impact resistance, and overall toughness while maintaining good ductility. The presence of additional chromium also boosts its resistance to wear and corrosion. Thanks to its balanced mechanical properties, 4140 is widely used for demanding applications such as high-strength fasteners, precision spindles, and pressure-bearing components like thin-walled vessels.

1045 steel is a medium carbon steel known for its balanced composition, typically containing carbon, manganese, silicon, and trace amounts of sulfur or phosphorus. It is widely used in steel CNC machining due to its excellent strength, toughness, and wear resistance. This material performs well under mechanical stress and is ideal for components that require durability and moderate resistance to moisture. 1045 is a go-to choice for shafts, gears, axles, and other precision CNC steel parts in industrial applications.

Often referred to as free-machining steel, this grade contains elevated sulfur levels, which significantly improve its machinability. Commonly known as "screw machine stock," it is frequently used in high-speed automatic machining operations. While it offers excellent performance in turning, drilling, and threading processes, its weldability is quite limited. This steel is especially well-suited for manufacturing CNC steel parts like screws, studs, pins, and other parts that demand high machining efficiency and tight dimensional control.

4340 steel is a high-strength, low-alloy steel known for its exceptional toughness, wear resistance, and fatigue strength. It retains its mechanical properties even under elevated temperatures, making it ideal for demanding environments. Due to its excellent hardenability and durability, 4340 is commonly used in the production of heavy-duty CNC steel parts such as gears, drive shafts, crankshafts, and other critical structural components in aerospace, automotive, and industrial equipment.