油缸筒的化学成分
|
钢级
|
20#
|
45#
|
25Mn
|
27Si Mn
|
Q345B（ST52）
|
*Q345D(ST52)
|
|
C
|
0.17~0.23
|
0.42~0.50
|
0.22~0.29
|
0.24~0.32
|
≤0.20
|
≤0.18
|
|
Si
|
0.17~0.37
|
0.17~0.37
|
0.17~0.37
|
1.10~1.40
|
≤0.55
|
≤0.55
|
|
Mn
|
0.35~0.65
|
0.50~0.80
|
0.70~1.00
|
1.10~1.40
|
1.00~1.60
|
1.00~1.60
|
|
P
|
≤0.035
|
≤0.025
|
≤0.03
|
≤0.035
|
≤0.04
|
≤0.03
|
|
S
|
≤0.035
|
≤0.02
|
≤0.03
|
≤0.035
|
≤0.04
|
≤0.03
|
|
CU
|
≤0.25
|
≤0.20
|
≤0.20
|
≤0.30
|
/
|
/
|
|
Ni
|
≤0.30
|
≤0.25
|
≤0.30
|
≤0.30
|
/
|
/
|
|
Cr
|
≤0.25
|
≤0.25
|
≤0.25
|
≤0.30
|
/
|
/
|
|
V
|
/
|
/
|
/
|
/
|
0.02~0.15
|
0.02~0.15
|
|
Nb
|
/
|
/
|
/
|
/
|
0.015~0.06
|
0.015~0.06
|
|
Ti
|
/
|
/
|
/
|
/
|
0.02~0.20
|
0.02~0.20
|
|
Al
|
/
|
/
|
/
|
/
|
/
|
≥0.015
|
油缸筒的机械性能
|
供应条件
|
冷加工（硬）
|
去应力退火
|
|||
|
钢级
|
抗拉强度Mpa
|
延长部分(%)
|
抗拉强度Mpa
|
屈服强度Mpa
|
延长部分(%)
|
|
20#
|
≥620
|
≥8
|
≥570
|
≥470
|
≥14
|
|
45#
|
≥650
|
≥5
|
≥600
|
≥520
|
≥12
|
|
ST 52
|
≥640
|
≥5
|
≥600
|
≥520
|
≥15
|
|
25Mn
|
≥640
|
≥5
|
≥600
|
≥510
|
≥15
|
|
27SiMn
|
≥840
|
≥5
|
≥720
|
≥600
|
≥10
|
