• Model NO.：IR-B
• Size：30mm~416mm
• Length：Fixed Length, by Random
• End Processing：Plain Ends
• Surface：Bare Pipe, Anti-Rust Painting
• Steel Material：St52, Q345b, 27simn, 15CrMo, 40cr, etc
• Transport Package：Standard Seaworthy Packing
• Specification：ASTM, DIN, GB,T
• Trademark：Iron&steel
• Origin：China
• HS Code：73045910
• Production Capacity：2000tons Per Month

Processing form
I.D.mm
Length
Straightness
I.D.tolerance
I.D.Roughness(RA)
Cold-rolled
30-100
≤12M
 
0.3-1.0/1000
H8-H10
0.4-1.6um
Cold-drawn
30-250
≤12M
H8-H10
0.8-1.6um
Hone
40-500
≤12M
H8-H9
0.4-0.8um
SRB
50-250
≤9M
H8
0.1-0.4um
 Tolerance of ID and WT
 
Size of inside
Diameter(mm)
                     ID Tolerance
Tolerance of wall thickness 
30
+0.0330
+0.0520
+0.0840
 
 
 
<120mm(OD)              ±5%
>120mm up to 210mm±7.5%
>210mm                     ±10%
 
 
 
 
>30-50
+0.0390
+0.0620
+0.1000
>50-80
+0.0460
+0.0740
+0.1200
>80-120
+0.0540
+0.0870
+0.1400
>120-180
+0.0630
+0.1000
+0.1600
>180-250
+0.0720
+0.1150
+0.1850
>250-315
+0.0810
+0.1300
+0.2100
>315-400
+0.0890
+0.1400
+0.2300
Length and cut tolerance
 
Length ≤ 500mm , +2mm
> 500mm ≤ 2000mm, +3mm
> 2000mm ≤ 5000mm, +5mm
> 2000mm ≤ 7000mm, +10mm
 
Standard:DIN 2391,EN10305
Material: St45,St52,E355
 
Chemical composition
 
Steel grade
Chemical composition,%
C
Si
Mn
P
S
Cr
≤
St45
0.17-0.24
0.17-0.37
0.35-0.65
0.035
0.035
0.250
ST52(E355)
≤0.22
≤0.55
≤1.6
0.025
0.025
0.25
SAE1026
0.22-0.28
0.15-0.35
0.60-0.90
0.040
0.050
/
27SiMn
0.24-0.32
1.10-1.40
1.10-1.40
0.035
0.035
0.300
20#
0.17-0.24
0.17-0.37
0.35-0.65
0.035
0.035
0.250
  
9. Mechanical Properties
 
Delivery condition
BK
Cold finished(hard)
BKS
Cold drawn and stress-relieved
Steel grade
Rm Mpa
Elongation
A5(%)
Rm MPa
ReH MPa
Elonggation
A5(%)
ST45
≥550
≥5
≥520
≥375
≥15
ST52(E355)
≥640
≥5
≥600
≥520
≥14
SAE1026
≥640
≥5
≥600
≥510
≥15
16Mn
≥640
≥5
≥600
≥520
≥14
20#
≥550
≥8
≥520
≥375
≥15
 
Tube ends
 
Tube ends shall be cut nominally square to the axis and free from burs
 
11.Delivery condition:BKS
Appearance
 
Tube shall have a smooth internal and external surface consistent with cold working  process, tube inner surface should be free from rust, scratches and other surface
irregularities.