|
牌號(hào)
|
C
|
Si
|
Mn
|
P
|
S
|
V
|
Nb
|
Al
|
Ti
|
Cr | Ni | Cu |
|
Q345D
|
0.18
|
≤0.50
|
≤1.70
|
≤0.030
|
≤0.025
|
≤0.15
|
≤0.07 |
≥0.015
|
≤0.20 | ≤0.30 | ≤0.50 | ≤0.30 |
Q345D與平時(shí)我們常用的Q345A區(qū)別就在于雜質(zhì)S、P更少，低溫沖擊性能更好，Q345D 含磷和硫都小于等于0.030%，而磷和硫雜質(zhì)元素在鋼中越多其沖擊韌性就越差。
