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DIN1629/2448: SEAMLESS CIRCULAR TUBES OF NON ALLOY STEELS WITH SPECIAL QUALITY REQUIREMENTS

Chemical Composition

Steel Grade C % Mn % Si % P % S %
ST37 0.17 max 0.35-0.65 0.17-0.37 0.040 max 0.040 max
ST44 0.21 max 0.50-0.80 0.17-0.37 0.040 max 0.040 max
ST52 0.22 max ¡Ü1.60 ¡Ü0.55 0.040 max 0.035 max

Mechanical Properties

Steel Grade Tensile Strength MPA Yield Strength MPA Elongation %
ST37 350-480 235 min 25 min
ST44 420-550 275 min 21 min
ST52 500-650 355 min 21 min 

Dimensional Tolerance
Type of the Steel pipe Out Diameter Wall Thickness
Cold  Drawn  Pipe Out Diameter  Tolerance ange Tolerance Range
£¾25.4 ¡À 0.1 0-20%
25.4-38.1 ¡À 0.15
38.1-50.8 ¡À 0.2

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