碳C: ≤0.15
硫S:≥0.15
|
热处理温度(℃)及冷却
|
σb (MPa)
|
σs (MPa)
|
δ5 (%)
|
HRB
|
|
950-1100快冷
|
≥590
|
≥390
|
≥18
|
≤29
|




