1. Chemical Composition
Table 2 - Chemical composition, unit %
| Grade | C | Si | Mn | P | S | Ni | Cr | Mo | Cu |
|---|---|---|---|---|---|---|---|---|---|
| SNCM420 | 0.17 ~ 0.23 | 0.15 ~ 0.35 | 0.40 ~ 0.70 | ≤0.030 | ≤0.030 | 1.60 ~ 2.00 | 0.40 ~ 0.60 | 0.15 ~ 0.30 | ＜0.30 |
Elements not specified in this table shall not be intentionally added, except where necessary for steelmaking purposes.
Note a) Shall not be intentionally added.
b) For SNCM630, the lower limit for Mo may be 0.30% upon agreement between supplier and purchaser.
c) Al content for SACM645 is 0.70% ~ 1.20%.
Note a) Shall not be intentionally added.
b) For SNCM630, the lower limit for Mo may be 0.30% upon agreement between supplier and purchaser.
c) Al content for SACM645 is 0.70% ~ 1.20%.
2. Mechanical properties of wire rod
Mechanical property values shall be determined by agreement between the supplier and the purchaser.
3. Dimensional Tolerances
Table 8 - Dimensional tolerances for hot-rolled wire rod
| Diameter | Diameter tolerance | Out-of-roundness |
|---|---|---|
| <15 | ±0.3 | <0.4 |
| 15<d≤25 | ±0.4 | <0.5 |
| 25<d≤32 | ±0.5 | <0.6 |
| 32<d≤50 | ±0.6 | <0.7 |
Tolerances for wire rod with a diameter exceeding 50 mm shall be determined by agreement between the supplier and the purchaser.
Note a) Out-of-roundness refers to the difference between the maximum and minimum diameters measured on the same cross-section of the wire rod.
Note a) Out-of-roundness refers to the difference between the maximum and minimum diameters measured on the same cross-section of the wire rod.