SWCH16A is a carbon steel wire for cold heading with specific properties and uses. SWCH16A has stable performance, moderate strength and good toughness, and can withstand large deformation without cracking, so that parts with complex shapes and high dimensional accuracy can be manufactured to meet the requirements of cold heading processing and forming. It also has a smooth surface and uniform diameter, reducing production costs.

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; "16" means a carbon content of about 0.16%.

Application：Manufacturing various types of screws (such as bolts, nuts, rivets, machine screws, self-tapping screws, etc.) and various parts made by cold heading; widely used in many fields such as automobiles, machinery manufacturing, and construction.

Mechanical properties:

-When spheroidizing annealing (DA) is performed before cold working of 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.