DIN-2391-St30-Steel-Pipe-Specification-1

Carbon Steel Pipe and Alloy Steel Tube Manufacturers and SuppliersDIN 2391 St30 Steel Pipe SpecificationDIN 2391 St30 is a cold-finished seamless precision steel tube mainly used for applicationsrequiring high dimensional accuracy.St30 can be divided into two grades,St30Al(1.0212)andSt30Si(1.0211),which have the same mechanical properties but different chemical compositionrequirements.DIN 2391 St30 shall be supplied in quality A if not specifically required.女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 conditionTensileDIN 2391 St30Al and St30SiTensile strength Rm430 MPa minCold finished (hard)(BK)Elongation at fracture As8%minTensile strength Rm380 MPa minCold finished (soft)(BKW)Elongation at fracture As12%minTensile strength Rm380 MPa minCold finished and stress-relieved (BKS)Yield strength RaH280 MPa minElongation at fracture As16%minTensile strength Rm280 MPa minAnnealed(GBK)Elongation at fracture As30%minTensile strength Rm290-420MPaNormalized (NBK)Yield strength ReH215 MPa minElongation at fracture As30%minWhatsApp:008613463768992 Email:sales@botopsteelpipes.com Website:www.botopsteelpipes.com