pipe

pipe
1.Grade: 20#,45#,16Mn, 27SiMn,25Mn
2.Standard: API, GB
3.Diameter:50-300mm
4.Thickness:2-50mm
pipe
Product variety
Processing mode
Diameter
Length
Linearity
Precision
Roughness of inner hole
Cold drawn
50-300
less than13.5M
0.3-1.0
H8-H10
0.8-1.6
Honing
50-300
less than 13.5M
1000
H8-H9
0.4-0.8
Cutting Rolling
50-300
less than7.5M
H8
0.4
Mechanical performance
Model
Item
Cold drawn (rolling) tube
metallic cut pipe
20
Intensity of tension σbN/ mm2
≥510
≥390
Elongation rate δ5%
≥5
≥20
45
Intensity of tension σbN/ mm2
≥647
≥590
Elongation rate δ5%
≥4
≥4
16Mn
Intensity of tension σbN/ mm2
≥640

Elongation rate δ5%
≥10

27SiMn
Intensity of tensionσbN/ mm2
≥840

Elongation rate δ5%
≥7.5

Size tolerance
Inner diameter

warp of wall thickness
H8
H9
H10
50-80
+0.046
0
+0.074
0
+0.120
0
±5%
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
250-300
+0.081
0
+0.130
0
+0.210
0
Unit:mm
Hardness
diameter
outer diameter
inner diameter
inner diameter warp
inner diameter warp
roundness≤80m
chromeplate≥8m
chromeplate
28
41.28
28.58
+0.03
-0.05
-0.05
-0.15
0.03
32
44.45
31.75
47.75
38
50.80
38.10
54.10
44
57.10
44.45
60.45
57
69.85
57.15
73.15
70
82.55
69.85
-0.03
-0.15
0.05
85.85
83
95.25
82.55
-0.15
-0.25
98.55
95
111.25
95.25
108
123.95
107.95