Grade and Chemical Composition (%)
Grade |
C≤ |
Si≤ |
Mn |
P≤ |
S≤ |
STPG370 |
0.25 |
0.35 |
0.30~0.90 |
0.040 |
0.040 |
STPG410 |
0.30 |
0.35 |
0.30~1.00 |
0.040 |
0.040 |
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Mechanical Properties |
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Grade |
Tensile strength |
Yield strength |
Elongation % |
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N/ m㎡ |
N/ m㎡ |
No.11 or No.12 test pieces |
No. 5 test pieces |
No. 4 test piece |
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|
Longitudinal |
Transverse |
Longitudinal |
Transverse |
|
STPG370 |
370 min |
215 min |
30 min |
25 min |
28 min |
23 min |
STPG410 |
410 min |
245 min |
25 min |
20 min |
24 min |
19 min |
UT Inspection
Straightness Inspection
Appearance Inspection
Out Diameter Inspection
Wall Thickness Inspection
End Inspection
-
- Tolerance of OD
Division
Tolerance on O.D
Tolerance on W.T
Hot finished seamless steel pipe
Nominal diameter
tolerance
Thickness division
tolerance
40A or under
+/-0.5mm
Under 4mm 4mm or over
+0.6mm -0.5mm
+15%
-12.5%
50A or over up to and incl.125A
+/-1%
150a
+/-1.6mm
200A or over
+/-0.8%
Cold finished seamless steel pipe
24A or under
+/-0.3mm
Under 3mm
3mm or over
+/-0.3mm
+/-10%
32A or over
+/-0.8%
For pipes of nominal size 350A or over,the tolerance on O.D maybe determined by the circumferential length. In this case,the tolerance shall be +/-0.5%
- Tolerance of OD