DIN-2391-St45-Steel-Pipe-Specification-1

Carbon Steel Pipe and Alloy Steel Tube Manufacturers and SuppliersDIN 2391 St45 Steel Pipe SpecificationDIN 2391 St45 is a cold-finished seamless precision steel tube containing a maximum of 0.21C and a minimum of 0.40%Mn,which is commonly used where accuracy to size,small wallthicknesses,a particular surface condition,and specific mechanical properties are required.Thesteel number is 1.0408.DIN 2391 St45 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 conditionTensileDIN23915t45Tensile strength Rm580 MPa minCold finished (hard)(BK)Elongation at fracture As5%minTensile strength Rm520 MPa minCold finished (soft)(BKW)Elongation at fracture As8%minTensile strength Rm520 MPa minCold finished and stress-relieved (BKS)Yield strength RaH375 MPa minElongation at fracture As12 minTensile strength Rm390 MPa minAnnealed(GBK)Elongation at fracture As21%minTensile strength Rm440-570MPaNormalized (NBK)Yield strength ReH255 MPa minElongation at fracture As21%minWhatsApp:008613463768992 Email:sales@botopsteelpipes.com Website:www.botopsteelpipes.com