DIN-2391-St52-Steel-Pipe-Specification

Carbon Steel Pipe and Alloy Steel Tube Manufacturers and SuppliersDIN 2391 St52 Steel Pipe SpecificationDIN 2391 St52 is a cold-finished seamless precision steel tube containing a maximum of 0.22C and 1.60%Mn,which is commonly used where accuracy to size,small wall thicknesses,aparticular surface condition,and specific mechanical properties are required.The steel number is1.0580.DIN 2391 St52 shall be supplied in quality A if not specifically required.交Delivery ConditionSymbolDesignationDescriptionBKCold finished (hard)Tubes do not undergo heat treatment following the final cold forming and,thus,have a rather high resistance todeformation.BKWCold finished(soft)The final heat treatment is followed by cold drawing involving limited deformation.Appropriate further processingallows a certain degree of cold forming (e.g.bending expanding)BKSCold finished and stress-relievedHeat treatment is applied following the last cold forming process.Subject to appropriate processing conditionsthe increase in the residual stresses involved enables both forming and machining to a certain degree.GBKAnnealedThe last cast cold forming process is followed by annealing in a controlled atmosphere.NBKNormalizedThe last cold forming process is followed by annealing above the upper transforming point in a controlledatmosphere.Mechanical PropertiesFinal supply conditionTensileDIN23915t52Tensile strength Rm640 MPa minCold finished (hard)(BK)Elongation at fracture As4%minTensile strength Rm580 MPa minCold finished (soft)(BKW)Elongation at fracture As7%minTensile strength Rm580 MPa minCold finished and stress-relieved (BKS)Yield strength RaH420 MPa minElongation at fracture As10%minTensile strength Rm490 MPa minAnnealed(GBK)Elongation at fracture As22%minTensile strength Rm490-630MPaNormalized (NBK)Yield strength ReH355 MPa minElongation at fracture As22%minWhatsApp:008613463768992 Email:sales@botopsteelpipes.com Website:www.botopsteelpipes.com