Cold-Heading Quality (CHQ) Wire Rod
Cold-Heading Quality (CHQ) Wire Rod
Cold-Heading Quality (CHQ) Wire Rod is a specialized steel product used in the manufacturing of high-performance fasteners through cold-forming or cold-heading processes. Produced using tightly controlled chemistry and rolling practices, CHQ wire rod is engineered to offer superior surface quality, consistent mechanical properties, and excellent formability — making it ideal for critical applications in automotive, construction, and industrial sectors.
Key Features:
- Superior Surface Quality: Free from defects to ensure optimal cold-forming performance.
- High Strength & Ductility: Allows for complex forming operations without cracking.
- Tight Dimensional Tolerances: Ensures consistency in production.
- Excellent Machinability: Suitable for secondary operations like threading and heat treatment.
Standards:
- ASTM A108
- SAE J412
- EN 10263
- JIS G3507
- IS 8910
Cold-Heading Quality (CHQ) Wire Rod – Technical Specifications
| Parameter | Specification |
|---|---|
| Material Grades | SAE 1008, SAE 1010, SAE 1018, 10B21, 15B25, 4140, 8620, customized boron grades |
| Diameter Range | 5.5 mm to 25 mm |
| Tensile Strength | 400 – 950 MPa (depending on grade & condition) |
| Elongation | Min. 10% (varies with grade) |
| Surface Condition | As-rolled, pickled, phosphate-coated, or spheroidized annealed |
| Tolerance | As per ASTM A510 / EN ISO 16120 / customer specification |
| Microstructure | Homogeneous with fine pearlite/ferrite or spheroidized structure |
| Decarburization | ≤ 0.05 mm (controlled for CHQ applications) |
| Coil Weight | 1.5 – 2.5 MT (customizable) |
| Standards | ASTM A510, SAE J403, EN 10277, JIS G3507 |
| Applications | Automotive bolts, nuts, screws, rivets, cold-forged components |
| Packaging | Coils with steel strapping, VCI film or as per customer requirement |
CHQ Wire Rod – Chemical Composition
| Grade | C (%) | Mn (%) | P (max%) | S (max%) | B (%) | Remarks |
|---|---|---|---|---|---|---|
| SAE 1008 | 0.08 max | 0.30 – 0.50 | 0.040 | 0.050 | — | Low carbon for excellent cold-forming |
| SAE 1018 | 0.15–0.20 | 0.60–0.90 | 0.040 | 0.050 | — | Higher strength, moderate formability |
| 10B21 | 0.18–0.23 | 0.70–1.00 | 0.030 | 0.035 | 0.0005–0.003 | Boron-added for enhanced hardenability |
| 15B25 | 0.22–0.27 | 0.70–1.00 | 0.030 | 0.035 | 0.0005–0.003 | Medium carbon + boron |
| 4140 (Alloy) | 0.38–0.43 | 0.75–1.00 | 0.035 | 0.040 | — | Chromium-molybdenum alloy |
| 8620 (Alloy) | 0.18–0.23 | 0.70–0.90 | 0.035 | 0.040 | — | Low carbon alloy, carburizing grade |
CHQ Wire Rod – Mechanical Properties
| Property | SAE 1008 | SAE 1018 | 10B21 | 15B25 | 4140 | 8620 |
|---|---|---|---|---|---|---|
| Tensile Strength (MPa) | 350 – 450 | 420 – 520 | 450 – 550 | 480 – 580 | 650 – 850 | 500 – 700 |
| Yield Strength (MPa) | 200 – 300 | 300 – 380 | 350 – 450 | 370 – 470 | 420 – 600 | 350 – 500 |
| Elongation (%) | 30 – 40 | 25 – 35 | 22 – 32 | 20 – 30 | 12 – 20 | 18 – 25 |
| Hardness (HBW) | 95 – 120 | 120 – 140 | 140 – 160 | 150 – 170 | 180 – 220 | 160 – 190 |
Applications
- Bolts, Screws, Rivets, Studs
- Automotive Fasteners
- Aerospace Components
- Industrial Machinery Parts