A plate element is usually a primary steel product produced by hot rolling (Hot Rolling) and delivered in a roll. It is the "raw material" for the production of all steel wire products ".
· Manufacturing process: hot rolling.
Surface state: The surface is usually with oxide scale, which is rough and has a relatively wide diameter tolerance.
Physical properties: The structure mainly depends on the cooling rate after hot rolling.
Typical uses: fences, steel wire mesh, construction steel bars, and as a blank for the production of fine wire.
2. What is cold heading quality wire (CHQ Wire)?
CHQ (Cold Heading Quality) Wire is a special wire specially designed for * * cold heading (Cold Heading) and cold extrusion (Cold Forging)* * processes through a series of precise deep processing processes on the basis of plate elements.
· Core processing: drawing (Drawing), annealing (Annealing), pickling (Cleaning) and surface coating (Coating).
Surface condition: extremely high precision dimensional tolerance, smooth surface without defects.
· Physical characteristics: excellent ductility and uniform internal organization, to ensure that under the huge stamping pressure will not break or crack.
· Typical use: high-strength bolts, nuts, screws and complex auto parts.
3. The core difference between CHQ Wire and Wire Rod (Comparison Table)
CHQ Wire
Hot Rolled Cold Drawing Heat Treatment (Cold Drawn & Treated)
Large dimensional accuracy tolerance (usually ± 0.3-0.5mm) extremely high precision (usually up to h9/h10 level)
The surface quality contains oxide scale, there may be slight cracks without oxide layer, after flaw detection treatment, the surface is perfect
The original hot-rolled tissue of the internal tissue, the hardness of the uneven ball annealing treatment, the tissue is extremely uniform.
Poor molding performance, excellent direct cold heading and easy cracking, support for multi-station large deformation molding
Lower price (primary material) higher (including deep processing cost)
4. Why cold heading process must use CHQ Wire?
In the manufacture of bolts or parts of complex shape, the metal needs to undergo severe plastic deformation.
1. Prevent cracking: There may be segregation or tiny impurities inside the ordinary wire, which will directly cause the product head to burst during cold heading. The CHQ level represents a strict control of the purity of the molten steel.
2. Extend the life of the die: The surface of the CHQ wire is usually provided with a special lubricating coating (such as phosphating coating or polymer coating), which can greatly reduce friction and protect the expensive cold heading die.
3. Product consistency: The automatic molding machine produces hundreds of parts per minute, and the extremely high dimensional consistency of the CHQ wire ensures that the production process will not be interrupted by stuck materials.
Conclusion (Conclusion)
The plate element (Wire Rod) is the skeleton, while the CHQ wire (CHQ Wire) is the finished product. If your application scenario is just simple stretching or welding, ordinary wire is sufficient; but if you are engaged in fastener production, auto parts manufacturing or any process involving cold forming, CHQ Wire is to ensure product quality and production efficiency The only choice.
