Test：tension test, flattening test, flaring test, hardness test, hydrostatic or nondestructive electric test,etc.
|
Standard |
Grade |
Chemical Composition Limits (%) |
||||||
|
C |
Si |
Mn |
P |
S |
Cr |
Mo |
||
|
DIN1629 |
St37.0 |
≤ 0.17 |
/ |
/ |
≤ 0.040 |
≤ 0.040 |
/ |
/ |
|
St44.0 |
≤ 0.21 |
/ |
/ |
≤ 0.040 |
≤ 0.040 |
/ |
/ |
|
|
St52.0 |
≤ 0.22 |
≤ 0.55 |
≤ 1.70 |
≤ 0.040 |
≤ 0.040 |
/ |
/ |
|
|
Standard |
Grade |
|
Tensile Strength (MPa) |
Yield Strength (MPa) |
Elongation (%) |
|
DIN1629 |
St37.0 |
|
350-480 |
≥ 235 |
≥ 25 |
|
St44.0 |
|
420-550 |
≥ 255 |
≥ 21 |
|
|
St52.0 |
|
500-650 |
≥ 270 |
≥ 21 |
|
Outer Diameter (mm) |
Outside Diameter Deviation |
|
|
Pipe Body and Pipe End |
Pipe End: It needs to be specially dealed. |
|
|
≤ 100 |
±1%D OR ±0.5mm |
± 0.4 mm |
|
100 < D ≤ 200 |
±1%D |
± 0.5 % D |
|
> 200 |
±1%D |
± 0.6% D |
|
D ≤ 130 mm |
130 < D ≤ 320 mm |
320 < D ≤ 660 mm |
||||||
|
S≤ 2Sn |
2Sn < S ≤ 4Sn |
> 4Sn |
≤ 0.05D |
0.05D < S ≤ 0.11D |
>0.11D |
≤ 0.05D |
0.05D < S ≤ 0.09D |
> 0.09D |
|
0.05 |
12.50% |
± 9% |
17.50% |
± 12.5% |
±10% |
20% |
15% |
12.50% |
|
-10% |
-12.50% |
-15% |
-12.50% |
-10% |
||||
Note: Sn is the length deviation of DIN1629 with standard thickness regulated in DIN2448.
