Specifications: diameter: 320 to 127 mm thickness: 0.4 to 12.7 mm Length: 6 m above, and, in accordance with customer demand, supply and other specifications of steel pipe

How to calculate 20 # 45 # precision seamless steel pipe siz


 

 

 

How to calculate 20 # 45 # precision seamless steel pipe size tolerances

20 # 45 # seamless steel pipe

20 # 45 # precision seamless steel pipe

20 # 45 # precision seamless steel mechanical properties
 
Steel grades
Mechanical Properties
Cold drawn (rolled) pipe
Metal cutting tube
# 20
Tensile strength σbN/mm2
Elongation δ5%
≥ 510
≥ 390
≥ 5
≥ 20
45 #
≥ 647
≥ 590
≥ 4
≥ 4
 
 
Processed form
Bore
Length
Straightness
Dimensional accuracy
Inner hole roughness
Cold-rolled
30-100
≤ 12M
0.3-1.0
H8-H10
0.4-1.6
Cold Drawn
30-250
≤ 12M
H8-H10
0.8-1.6
Honing
40-500
≤ 12M
1000
H8-H9
0.4-0.8
Rolling
40-400
≤ 7M
H8
0.4
 
Dimensional tolerances
 
Dimensional tolerances (thickness deviation of ± 5%)
Diameter size
H8
H9
H10
30
+0.033
0
+0.052
0
+0.084
0
> 30-50
+0.039
0
+0.062
0
+0.100
0
> 50-80
+0.046
0
+0.074
0
+0.120
0
> 80-120
+ 0.054
0
0.087
0
+0.140
0
> 120-180
+0.063
0
+0.100
0
+0.160
0
> 180-250
+0.072
0
+0.115
0
+0.185
0
> 250-315
+0.081
0
+0.130
0
+0.210
0
> 315-400
+0.089
0
+0.140
0
+0.230
0
 

The high-pressure boiler tubes dimensional tolerances

 

 
The steel pipe types diameter (D) wall thickness (S)
Pipe wall thickness cold drawn pipe steel pipe diameter (mm) allow deviation (mm) (mm) allow deviation (mm)
> 30 ~ 50 ± 0.3> 3 ~ 20 ± 10%

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