St37 Seamless Tube 88.9mm Diameter

St37 Seamless Tube 88.9mm Diameter

Specification OD : 13.7mm-323.8mm WT: 2mm-85mm Length : 6m-12m or as required Application: Pipeline steel pipe, vessel steel pipe, fluid pipe for low&medium pressure boiler Supplementary Technology: Tensile test, flattening test, leak tightness test, surface inspection, product analysis....

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  • St37 material seamless tube specification:


  • OD: 13.7mm-323.8mm                                                 

  • WT: 2mm-85mm

  • Length: 6m-12m or as required

  • Application: Pipeline steel pipe, vessel steel pipe, fluid pipe for low&medium pressure boiler

  • Supplementary Technology: 

  • Tensile test, flattening test, leak tightness test, surface inspection, product analysis. Beveled end, plain end, varnished, or adding plastic caps as per customer’s requirements

  • Surface: Bared or painted, galvanized or with oiled or client option.

  • Delivery state: Hot Rolled, Cold Drawn

  • Steel Grade: St37, St44, St52

DIN 1629 seamless pipes standard includes 3 basic steel grades (ST37, ST44, ST52.), this standard specifies the Seamless Circular Tubes of Non Alloys Steels that are used in construction of chemical plant, pressure vessels, pipe system and general mechanical and engineering purposes. Din 1629 seamless steel tubes and pipes are suitable for gas fusion welding, arc welding, flash butt welding, electric pressure welding and gas pressure welding. 

DIN 1629 Steel Pipe Chemical Composition:

Chemical Composition(%) 
Steel GradeCSiMnPS
St37≤0.17--≤0.035≤0.035
St44≤0.21--≤0.035≤0.035
St52.0≤0.22≤0.55≤1.60≤0.035≤0.035

DIN 1629 Steel Pipe Mechanical Property:

 Mechanical Properties
Steel GradeTensile strength(Mpa)Yield point(Mpa)Elongation(%)LElongation(%)T
St37350-480≥235≥25≥23
St44420-550≥275≥21≥19
St52.0500-650≥355≥21≥19

DIN 1629 Steel Pipe Equivalent steel grade:

DIN 1629ENBS NFA 49.210/49.112ASTM 53
Grade St 37EN 10216.1Grade P235 T1Grade TU 37 B TU E 220 AGrade A
Grade St 44EN 10216.1Grade P275T1Grade TU 42 B TU E 235 AGrade B
Grade St 52-0EN 10216-3Grade P355NNFA Grade P355NASME SA 381 Grade Y 52


Elevated temperature upper yield stress values of DIN 1629 Steel Pipe

Steel GradeYield stress value by working temperature(Thickness increasing)
50℃200℃250℃300℃
St 37235-215185-170165-150140-130
St 44275-255215-200195-180165-155
St 52355-335248-230225-210195-185

IMG_0692_副本1

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