Cold heading quality Steel wire rod (CHQ Wire Rod) involves particular raw materials and chemistry to withstand swedging and heading and forming with great quality. It is suitable for fastener and cold heading applications such as bolts, nuts, screws, rivets, nails, etc. SMC keeps strict control of the surface and chemical composition of the wire to offer the best product.
Specifications of Cold Heading Quality Steel Wire Rod (CHQ Wire Rod):
1) Wire diameter: 5.5mm - 30mm
2) Coil weight: 2,000kg
3) Grade: SUJ2, SWCH6A-10A, SWCH12A-45K, SCM415-420, SCM435-440,
SCr415-440, SWCH6A-22A, SWCH6A, SNCM240, SCr415-420, SCr435-440,
SCM415-420, SCM435-440, SCr415-420, SCM415-420, etc.
Process of Cold Heading Quality Steel Wire Rod (CHQ Wire Rod):
Pickling & coating
The hot-rolled coil or wire rod passes through the pickling line, where hydrochloric acid solution is used to remove surface scale for clean surface finish before further processing and to form a lubrication film on the surface to reduce the coefficient of friction in the drawing and cold working process. The Gantry Crane moves between the tank during the process.
This process which produces half-finished products for the following stage improves the spherodized ratio during spheroidized annealing. The wire drawing machine composed of Supply Stand ,Drawing Drum, Take up stages produces half-finished coil products.
This annealing process with the purpose of obtaining spheroidized carbides facilitates the cold works. Once inserted in the heat treatment furnace, the process takes place in the order of controlled heating up to a given time, temperature and furnace atmosphere, along with maintenance at such temperature during a certain period and cooling controlled in accordance with the purpose intended. This process is controlled by automatic heat cycle.
Pickling & coating
The hot-rolled wire rod passes through the pickling line, where hydrochloric acid solution is used to remove surface scale for clean surface finish before further processing and to form a lubrication film on the surface to reduce the coefficient of friction in the drawing and cold working process.
The wire drawing machine produces half-finished coils where products meet the customers' needs in terms of the size and mechanical properties of products.
Packaging of Cold Heading Quality Steel Wire Rod (CHQ Wire Rod)
Shanghai Metal Products are packed and labeled according to the regulations and customer's requests. Great care is taken to avoid any damage which might be caused during storage or transportation. In addition, clear labels are tagged on the outside of the packages for easy identification of the product I. D. and quality information.
1) Shanghai Metal Standard
To meet the entirety of our customers business needs, SMC offers its services as a “One-Stop Shop” for business services including Purchasing, Value-Added Manufacturing, Packaging/Labeling, and Delivery. SMC prides itself on achieving superior results and satisfying customer needs. In this, we earnestly strive to fulfill our role as trustworthy and reliable supplier of business services throughout the entire world.
Our Value-Added Manufacturing Services not only save our customer time from having to out-source, but also spare them the cost of dealing with several disparate shops and deadlines.
Like cold rolling, cold drawing is performed at room temperature, but instead of producing a flat object like a coke can, cold drawing makes steel into the form of a wire like the spokes of a wheel or a paper clip. To start the process, Steel is usual hammered and rolled so that it can be fit through a die;a tool that turns the steel mass into a wire. The room temperature steel is pulled through the die which reshapes it into a thinner shape while maintaining the same volume. It is similar to the idea of syrup flowing out of a bottle through a tube in that it changes shape but not volume, but instead of squeezing the metal, it is pulled out. In order to get the wire down to the right diameter, it usually requires more than one pass through different dies.