As the main raw material needed by the standard pieces manufacture industries, the cold heading steel, standard executed is GB/T6478—2001, is used to make work pieces in every specification such as bolt, screw, nut etc. Because of the large deformation in the process of cold heading, the steel grade is required to have less content of sulfur and phosphor, less impurity, excellent machining and mechanical performances and accurate rolling tolerances.
Cold Heading Steel
| Grade | Diameter（mm） | Standard | Application | Status on Delivery | Remarks |
| ML08 | ∮5.5、∮6.5、∮8
∮10、∮12、∮14、 ∮16 |
GB/T6478—2001 | Used to make work pieces such as bolt, screw, nut etc. | Hot Rolled Wire Coil | By Section Rolling Mill |
| ML08AL | |||||
| ML35 | |||||
| ML35A | |||||
| ML40Cr |
As the main raw material needed by the standard pieces manufacture industries, the cold heading steel, standard executed is GB/T6478—2001, is used to make work pieces in every specification such as bolt, screw, nut etc. Because of the large deformation in the process of cold heading, the steel grade is required to have less content of sulfur and phosphor, less impurity, excellent machining and mechanical performances and accurate rolling tolerances. QIS already could produce the cold heading steel wire coil for cold heading in grade of ML08,ML35 and ML40Cr with diameters range of φ5.5mm～φ16mm.