Basic Differences Between Wire Rod and CHQ Wire
Wire rod typically refers to hot-rolled steel delivered in coils, serving as the raw material for subsequent drawing, heat treatment, and surface treatment. CHQ wire is further processed and validated from wire rod to meet the requirements of cold heading or cold extrusion applications.
Key comparison points
| Item | Wire rod coils | CHQ wire |
|---|---|---|
| Typical condition | Hot-rolled coils | Pickling, coating, drawing and/or heat treatment performed as per order requirements |
| Main applications | Raw material for steel wire and other deep-processed products | For cold-formed parts such as those produced by cold heading and cold extrusion |
| Key Focus Areas | Steel grade, dimensions, surface quality, and hot-rolled quality | On this basis, further attention is paid to formability, microstructure, hardness, and consistency in surface and dimensions |
| Delivery Confirmation | All items shall be confirmed in accordance with current standards, customer drawings, and technical agreements specified in the order | |
Surface, microstructure and cost depend on the specification
Hot-rolled rod commonly has mill scale. Further processing can remove scale, prepare a lubricating coating and adjust dimensions and microstructure for the intended forming route. Not all CHQ wire is spheroidize-annealed, and surface inspection does not establish an absolutely defect-free product.
Dimensional tolerances, inspection methods and acceptance limits must be agreed for the grade, diameter and delivery condition. No universal wire-rod tolerance or h9/h10 requirement is assumed. Further processing adds cost, so compare the delivered material together with forming performance, yield and total manufacturing cost.
How to Choose
The two are not simply a matter of superior or inferior quality. If used for wire drawing or other processing, select the appropriate wire rod based on subsequent processes; if used for multi-station cold heading, complex cold extrusion, or parts requiring high batch stability, select the corresponding CHQ wire based on steel grade, process route, and inspection requirements.