DIN 1629 Non-alloy steel seamless pipes
DIN 1629 is a German industrial standard for non-alloy steel seamless pipes, mainly suitable for fluid transportation, structural purposes and pipeline engineering.
Main steel grades and their properties
Steel Type | Chemical composition (%) | Yield Strength | Tensile strength | Elongation (%) |
St 37.0 | C ≤ 0.17, Mn ≤ 1.4 | ≥ 235 | 360 - 480 | ≥ 25 |
St 44.0 | C ≤ 0.21, Mn ≤ 1.5 | ≥ 275 | 430 - 550 | ≥ 21 |
St 52.0 | C ≤ 0.22, Mn ≤ 1.6 | ≥ 355 | 490 - 630 | ≥ 20 |
Specifications and dimensions
OD(mm) | Wall thickness (mm) | Maximum working pressure (MPa) |
21.3 | 2 | 10 |
48.3 | 4 | 12.5 |
88.9 | 6 | 14.5 |
168.3 | 10 | 18 |
323.9 | 12.5 | 22.5 |
DIN 1629 Equivalent
Standard | Country/Region | Equivalent steel grades |
DIN 1629 | Germany | St 37.0, St 44.0, St 52.0 |
EN 10216-1 | Europe | P235TR1, P265TR1 |
ASTM A106 | United States | Grade A, Grade B, Grade C |
GB/T 8162 | China | 10#, 20#, Q345 |
JIS G3444 | Japan | STK400, STK490 |
DIN 1629 Temperature Range
Steel Grade | Yield stress value by working temperature(Thickness increasing) | |||
50℃ | 200℃ | 250℃ | 300℃ | |
St 37 | 235-215 | 185-170 | 165-150 | 140-130 |
St 44 | 275-255 | 215-200 | 195-180 | 165-155 |
St 52 | 355-335 | 248-230 | 225-210 | 195-185 |
DIN 1629 non-alloy steel seamless tubes play an indispensable role in the global industry due to their diverse specifications, excellent performance and wide range of applications.
