SWCH18A wire is an important carbon steel wire for cold heading. It has excellent strength and good ductility, which enables it to withstand large deformation without cracking during cold heading, and efficiently produce various parts with complex shapes and high dimensional accuracy requirements.

Its excellent processing performance and reliable quality make SWCH18A wire one of the indispensable important materials in industrial production.

Chemical element content (%)

Specification：2.00~42.00mm

Production process:

Process D: cold drawing of wire rod into steel wire;
Process DA: annealed cold drawn steel wire and annealed wire rod into cold drawn steel wire.

Deoxidation method: The character after the number in the grade indicates the deoxidation method of the steel, and "A" represents aluminum-killed steel.

Application: Commonly used to manufacture various high-precision, high-strength fasteners, such as bolts, nuts, screws, etc.; widely used in multiple industries such as automobiles, machinery, and electronics.

Mechanical properties:

-When spheroidizing annealing (DA) is performed before cold working of the wire, the tensile strength must be ≥370MPa, the cross-sectional shrinkage rate must be ≥55%, and the hardness HRB≤85;

-For wires with a diameter of t≤3, the tensile strength must be ≥690MPa in the cold working (D) state;

-For wires with a diameter of 3mmt≤4, the tensile strength must be ≥590MPa in the cold working (D) state, and the cross-sectional shrinkage rate must be ≥45%.

-For wires with a diameter of 4mmt≤5, the tensile strength in the cold working (D) state must be ≥490MPa, and the cross-sectional shrinkage must be ≥45%.
-For wires with a diameter of t>5, the tensile strength in the cold working (D) state must be ≥410MPa, and the hardness must be ≤92HRBW.

It should be noted that for steel wires with a diameter of 20mm or more, the minimum cross-sectional shrinkage should be 5 less than the specified value; for steel wires with a diameter of 3mm or less, the cross-sectional shrinkage is usually not specified.