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Hebei haihao high pressure flange & pipe fitting group was established in 1982, located in Mengcun County the hometown of pipe fittings in China.

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DIN 1629 Seamless tubes,pipes circular unalloyed steel

DIN1626 seamless steel ST42 pipe

DIN1626 seamless steel ST42 pipe

The EN 10216 comprises several parts. The parts that are relevant to us are as follows:

EN 10216 Part 1: non-alloy pipes with specified properties at room temperature

EN 10216 Part 2: non-alloy pipes with specified properties at higher temperatures

EN 10216 Part 3: alloy pipes made from fine-grained steel for any temperature

EN 10216-1, Quality P235TR2 (formerly DIN 1629, St.37.0) P = Pressure 235 = minimum yield strength in N/mm2 TR2 = quality with specified properties relating to aluminum content, impact values and inspection and test requirements. (In contrast to TR1, for which this is not specified). EN 10216-3, Quality P355 N (more or less equivalent to DIN 1629, St.52.0) P = Pressure 355 = minimum yield strength in N/mm2 N = normalized*


DIN 1269 Industrial pipe Mechanical Property &Chemical Components
Material Tensile strength (MPa) Yield strength (MPa) Elongation (%) C Si Mn P、S Cr
St37.0 350~480 ≥235 ≥25 ≤0.17 / / ≤0.04 /
St44.0 420~550 ≥255 ≥21 ≤0.21 / / ≤0.04 /
St52.0 500~650 ≥270 ≥21 ≤0.22 ≤0.55 ≤1.70 ≤0.04 /


Execution Norm Steel grade Execution Norm Steel grade
Welded DIN 1626 St.37.0 Welded DIN EN 10217-1 P235TR2
Welded DIN 1626 St.52.2 Welded DIN EN 10217-3 P355N
Seamless DIN 1629 St.37.0 Seamless DIN EN 10216-1 P235TR2
Seamless DIN 1629 St.52.2 Seamless DIN EN 10216-3 P355N
Seamless DIN 17175 St.35.8/1 Seamless DIN EN 10216-2 P235GH
Seamless ASTM A106* Grade B Seamless DIN EN 10216-2 P265GH
Seamless ASTM A333* Grade 6 Seamless DIN EN 10216-4 P265NL

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