●Size Tolerances
|
Standard
|
OD Tolerance
|
WT Tolerance
|
GB/T 8162
|
D＜50mm
|
±0.50mm
|
S＜4mm
|
±12.5%
|
D≥50mm
|
±1%
|
4-20mm
|
+15/-12.5%
|
S≥20mm
|
±12.5%
|
DIN1629
|
D＜50mm
|
±0.50mm
|
S2Sn
|
+15/-10%
|
D≥50mm
|
±1%
|
2SnS4Sn
|
+12.5/-10%
|
S4Sn
|
±9%
|
ASTM A53
|
D≤48.3mm
|
±0.40mm
|
±12.5%
|
D≥60.3mm
|
±1%
|
ASTM A106
|
D≤48.3mm
|
±0.40mm
|
±12.5%
|
48.3mm＜D≤114.3mm
|
±0.79mm
|
114.3mm＜D≤219.1mm
|
＋1.59－0.79mm
|
219.1mm＜D≤457mm
|
＋2.38－0.79mm
|
457mm＜D≤660.4mm
|
＋3.18-0.79mm
|
|
●Mechanical properties
|
Standard
|
Steel
|
Tensile Strength(MPa)
|
Yield strength(MPa)
|
Elongation (%)
|
<16mm
|
16-30mm
|
GB/T 8162
|
10
|
335
|
205
|
195
|
24
|
20
|
390
|
245
|
235
|
20
|
35
|
510
|
305
|
295
|
17
|
45
|
590
|
335
|
325
|
14
|
16Mn
|
490-665
|
325
|
21
|
DIN 1629
|
|
<16mm
|
>16mm
|
|
ST35
|
345-460
|
235
|
225
|
25
|
ST45
|
440-550
|
255
|
245
|
21
|
ST55
|
540-645
|
295
|
285
|
17
|
ST52
|
490-630
|
355
|
345
|
22
|
CK45
|
590-730
|
335
|
325
|
14
|
ASTM A53
|
A
|
330
|
205
|
As per table
|
B
|
415
|
240
|
ASTM A106
|
A
|
330
|
205
|
As per table
|
B
|
415
|
240
|
C
|
485
|
275
|
|
●Chemical composition: (%):
|
Standard
|
Steel
|
C
|
Si
|
Mn
|
P≤
|
S≤
|
Cu≤
|
Ni≤
|
Cr≤
|
Mo≤
|
V≤
|
GB/T 8162
|
10
|
0.07-0.14
|
0.17-0.37
|
0.35-0.65
|
0.035
|
0.035
|
0.25
|
0.25
|
0.15
|
/
|
/
|
20
|
0.17-0.24
|
0.17-0.37
|
0.35-0.65
|
0.035
|
0.035
|
0.25
|
0.25
|
0.25
|
/
|
/
|
35
|
0.32-0.39
|
0.17-0.37
|
0.50-0.80
|
0.035
|
0.035
|
0.25
|
0.25
|
0.25
|
/
|
/
|
45
|
0.42-0.50
|
0.17-0.37
|
0.50-0.80
|
0.035
|
0.035
|
0.25
|
0.30
|
0.25
|
/
|
/
|
16Mn
|
0.12-0.20
|
0.20-0.55
|
1.20-1.60
|
0.045
|
0.045
|
0.25
|
0.25
|
0.25
|
/
|
/
|
DIN 1629
|
St35
|
≤0.18
|
0.15-0.35
|
0.35-0.65
|
0.035
|
0.035
|
0.25
|
0.25
|
0.25
|
/
|
/
|
St45
|
≤0.25
|
0.15-0.35
|
0.50-0.80
|
0.035
|
0.035
|
0.25
|
0.25
|
0.25
|
/
|
/
|
St55
|
0.33-0.41
|
0.15-0.35
|
0.50-0.80
|
0.035
|
0.035
|
0.25
|
0.25
|
0.25
|
/
|
/
|
St52
|
≤0.20
|
≤0.55
|
≤1.50
|
0.035
|
0.035
|
0.25
|
0.25
|
0.25
|
/
|
/
|
CK45
|
0.42-0.50
|
0.17-0.37
|
0.50-0.80
|
0.035
|
0.035
|
0.25
|
0.25
|
0.25
|
/
|
/
|
ASTM A53
|
A
|
≤0.25
|
/
|
≤0.95
|
0.05
|
0.045
|
0.40
|
0.40
|
0.40
|
0.15
|
0.08
|
B
|
≤0.30
|
/
|
≤1.20
|
0.05
|
0.06
|
0.40
|
0.40
|
0.40
|
0.15
|
0.08
|
ASTM A106
|
A
|
≤0.25
|
≥0.10
|
0.27-0.93
|
0.035
|
0.035
|
0.40
|
0.40
|
0.40
|
0.15
|
0.08
|
B
|
≤0.30
|
≥0.10
|
0.29-1.06
|
0.035
|
0.035
|
0.40
|
0.40
|
0.40
|
0.15
|
0.08
|
C
|
≤0.35
|
≥0.10
|
0.29-1.06
|
0.035
|
0.035
|
0.40
|
0.40
|
0.40
|
0.15
|
0.08
|
|
