结构用无缝钢管

中国标准：GB/T8162-2008
钢      级：20，45，20Mn，Q345B，Q345C,Q345D,45Mn2, 27SiMn
交货状态：热轧
规格范围：外径73MM-630MM ,壁厚4MM-35MM 
公      差：按照GB/T8162-2008标准
长      度：根据客户要求
证      书：GB/T19001-2008
 
●  化学成分（熔炼分析）％
钢级
C
Si
Mn
P
S
Nb
V
Ti
Cr
Ni
Cu
N
Mo
B
Als
20
0.17-0.23
0.17-0.37
0.35-0.65
≤0.035
≤0.030
/
/
/
≤0.25
≤0.30
≤0.25
/
/
/
/
45
0.42-0.50
0.17-0.37
0.50-0.80
≤0.035
≤0.030
/
/
/
≤0.25
≤0.30
≤0.25
/
/
/
/
20Mn
0.17-0.23
0.07-0.37
0.70-1.00
≤0.035
≤0.030
/
/
/
≤0.25
≤0.30
≤0.25
/
/
/
/
Q345B
≤0.20
≤0.50
≤1.70
≤0.035
≤0.035
≤0.07
≤0.15
≤0.20
≤0.30
≤0.50
≤0.30
≤0.012
≤0.10
/
/
Q345C
≤0.20
≤0.50
≤1.70
≤0.035
≤0.030
≤0.07
≤0.15
≤0.20
≤0.30
≤0.50
≤0.30
≤0.012
≤0.10
/
≥0.015
Q345D
≤0.18
≤0.50
≤1.70
≤0.035
≤0.025
≤0.025
≤0.15
≤0.20
≤0.30
≤0.50
≤0.30
≤0.012
≤0.10
/
≥0.015
45Mn2
0.42-0.49
0.17-0.37
1.40-1.80
≤0.035
≤0.035
/
/
/
≤0.25
/
≤0.25
/
≤0.25
/
/
27SiMn
0.24-0.32
1.10-1.40
1.10-1.40
≤0.035
≤0.035
/
/
/
≤0.30
/
≤0.20
/
≤0.30
/
/
 
● 机械性能
钢级
屈服强度    min Mpa
抗拉强度
Mpa
伸长率
 
冲击试验
T in mm
≤16
＞16            ≤30
＞30
温度/℃
冲击功/J
≥
20
245
235
225
≥410
≥20
-
-
45
335
325
315
≥590
≥14
-
-
20Mn
275
265
255
≥450
≥20
-
-
Q345B
345
325
295
470-630
≥20
20
34
Q345C
345
325
295
470-630
≥21
0
34
Q345D
345
325
295
470-630
≥21
-20
34
45Mn2
885
≥735
≥10
-
-
27SiMn
980
≥835
≥12
-
-