Steel Rod,bars and Wire for Cold Heading and Cold Extrusion
Technical Delivery Conditions for Steels Not Intended for Heat Treatment After Cold Working
| Ingredients | C | Si ① | Mn ② | P | S | Al ③ |
|---|
| Min. Value | 0.18 | - | 0.7 | - | - | 0.02 |
| Max. Value | 0.22 | 0.1 | 0.9 | 0.025 | 0.025 | 0.06 |
For grades used in hot-dip galvanizing, the silicon content can be specified as 0.15 to 0.35%. In this case, the mechanical properties will be affected.
The minimum manganese content should be stipulated within the range of 0.20%.
The aluminium content can be replaced by other elements that can play the same role.
| Condition | Heat treatment
| Tensile strength σb Mpa | Reduction of area ψ % |
|---|
| Wire rods, steel bars；5＜d≤100 | Hot-rolled or untreated and tare (+U or +U+PE) | ≤560 | ≥55 |
| Wire rods, steel bars；5＜d≤100 | Spheroidizing annealing or spheroidizing annealing and peeling（+AC or +AC+PE) | ≤480 | ≥65 |
| Steel bar, steel wire；5＜d≤10 | Untreated and cold drawn（+U+C) | ≤650 | ≥53 |
| Steel bar, steel wire；10＜d≤40 | Untreated and cold drawn（+U+C) | ≤640 | ≥53 |
| Steel bar, steel wire；2＜d≤5 | Untreated and cold drawing and spheroidizing treatment（+U+C+AC） | ≤470 | ≥67 |
| Steel bar, steel wire；5＜d≤40 | Untreated and cold drawing and spheroidizing treatment（+U+C+AC） | ≤460 | ≥67 |
| Wire rods, steel bars；2＜d≤5 | Untreated, cold drawn, spheroidizing and flattening (+U+C+AC+LC) | ≤510 | ≥63 |
| Wire rods, steel bars；5＜d≤40 | Untreated, cold drawn, spheroidizing and flattening (+U+C+AC+LC) | ≤500 | ≥63 |
| Steel bar, steel wire；5＜d≤10 | Spheroidizing annealing and cold drawing（+AC+C） | ≤570 | ≥60 |
| Steel bar, steel wire；10＜d≤40 | Spheroidizing annealing and cold drawing（+AC+C） | ≤560 | ≥60 |
