DIN 1628 ST37.4 WELDED STEEL TUBES applies to seamless circular tubes and pipes made of unalloyed steels . These tubes are predominantly used in the constructin of chemical plant, vessels, pipework and for general mechanical engineering purposes. They are designed to meet high performance requirements. Normally there are no limiting vaiues or the maximum permissible working pressure of these tubes. The permissi l working temperature shall not exceed 300℃ .
Example:
A welded tube conforming to this standard. with an outside diameter of 114.3 mm and a wall thickness of 3.2 mm as specitied in DIN 258, made from St37.4 Steel in the normalized condition(N) SHALL BE DESIGNATED AS FOLLOWS:
Tube DIN 2458 - 114,3 x 3.2
DIN 1628 - St 37.4 N
DIN 1628 ST37.4 WELDED STEEL TUBES Chemical Requirements
| Element
|
C max
|
Si max
|
Mn
|
P
|
S
|
| Composition, %
|
0.17
|
0.35
|
≥0.35
|
0.040
|
0.040
|
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