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.化学成份
牌号
|
C
|
Si
|
Mn
|
P
|
S
|
V
|
Nb
|
Al
|
Ti 
|
Q345A
|
≤0.20
|
≤0.55
|
1.00-1.60
|
≤0.045
|
≤0.045
|
0.02-0.15
|
0.015-0.060
|
-
|
0.02-0.20
|
Q345B
|
≤0.20
|
≤0.55
|
 1.00-1.60
|
≤0.040
|
≤0.040
|
0.02-0.15
|
0.015-0.060
|
-
|
0.02-0.20
|
Q345C
|
 ≤0.20
|
 ≤0.55
|
1.00-1.60
|
≤0.035
|
≤0.035
|
0.02-0.15
|
0.015-0.060
|
≥0.015
|
0.02-0.20
|
Q345D
|
≤0.18
|
≤0.55
|
1.00-1.60
|
≤0.030
|
≤0.030
|
0.02-0.15
|
0.015-0.060
|
≥0.015
|
0.02-0.20
|
Q345E
|
≤0.18
|
≤0.55
|
1.00-1.60
|
≤0.025
|
≤0.025
|
0.02-0.15
|
0.015-0.060
|
≥0.015
|
0.02-0.20
|