GB3087 is a Chinese Standard for low and middle pressure boiler seamless steel pipes. It is used for manufacturing water wall, economizer, reheater, superheater, and steam pipe.Product Name10 carbon steel pipe20 carbon steel pipechemical analysisC:0.07-0.13;Si:0.17-0.37;Mn:0.35-0.65;P: 0.035; S: 0.035;Ni 0.30;Cr: 0.15;Cu 0.25C:0.17-0.23;Si:0.17-0.37;Mn:0.35-0.65;P: 0.035; S: 0.035;Ni 0.25;Cr: 0.25;Cu 0.25Tensile Strength335-475MPa410-550MPaYield strengthT 16mm, 205MPa;T 16mm, 195MPaT 16mm, 245MPa;T 16mm, 235MPaStandardGB3087LengthAs customer s requestPackagingStandard export packing, packed in woven bags, with two nylon slings, or can be customized as requestHeat Treatment/      Delivery ConditionCold 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 low and middle pressure boilerMain MarketAsia, Middle East, Europe, etc.