Changzhou Hongtai Precision Steel Pipes Co. specializes in steel pipes manufacturing and trading for many years, enjoys a great reputation in China. Our products are famous for their high quality and wide size range.Product NameSTKM11A steel pipeSTKM12A steel pipeSTKM13A steel pipeSTKM13C steel pipeSTKM14B steel pipechemical analysisC: 0.12;Si: 0.35;Mn: 0.60;P: 0.040; S: 0.040C: 0.20;Si: 0.35;Mn: 0.60;P: 0.040; S: 0.040C: 0.25;Si: 0.35;Mn:0.30-0.90;P: 0.040;S: 0.040C: 0.25;Si: 0.35;Mn:0.30-0.90;P: 0.040;S: 0.040C: 0.30;Si: 0.35; Mn: 0.30-1.00;P: 0.040; S: 0.040Tensile Strength290MPa340MPa370MPa510MPa500MPaYield strength-175MPa215MPa380MPa355MPaStandardJIS G3445LengthAs customer’s requestPackagingStandard export packing, packed in woven bags, with two nylon slings, or can be customized as requestHeat Treatment/      Delivery ConditionCold finished (hard)   BK(+C)Tubes do not undergo heat treatment following the final cold forming and, thus, have a rather high resistance to deformationCold finished (soft)    BKW(+LC)The final heat treatment is followed by cold drawing involving limited deformation. Appropriate further processing allows a certain degree of cold forming (e.g. bending, expanding)Cold finished and stress-relieved annealing BKS(+SR)Heat treatment is applied following the last cold forming process. Subject to appropriate processing conditions, the increase in the residual stresses involved enables both forming and machining to a certain degree.Annealed    GBK(+A)The last Cold forming process is followed by annealing in a controlled atmosphere.Normalized   NBK(+N)The last cold forming process is followed by annealing above the upper transformation point in a controlled atmosphere.Delivery TimeWithin 35-50 days from receiving depositPayment Term100% L/C at sight or 30% deposit, 70% balance against copy of B/LUsage/ApplicationPipes for automobile and motorcycleMain MarketAsia, Middle East, Europe, etc.