barco tubo

Standards Standard for malerials and wielding from Chinese classifying society Chinese clasifying society(CCS) Standard of DNV Det Norske Veritas(DNV) Standard of LloydS Register of UK(LR)LloydS Register of UK(LR) Standard of Germanischer Lloyd Germanischer Lloyd(GL) Standard of American Bureau of Shipping(ABS)American Bureau of Shipping(ABS) Standard of BUREAU VERITAS(BV)BUREAU VERITAS(BV) Standard of RINA Italian classification society(RINA) Standard of NIPPON KAIJI KYOKAI(NK)NIPPON KAIJI KYOKAI(NK) GBT5312 Chinese national standard Appication Seamless steel tubes for manufacturing marine boilers and ovemeaters as we as pressure pipes opf grade I and . Model N0.of major steel tubes 320,360,410,460,490,etc. Types of steel tubes Outer diameters wall thickness Cold-rolled tubes Rube size(mm) tolerances(mm) Tube sizes (mm) Tolerances(mm) 30∼50 ±0.3 ≤30 ±10 50∼219 ±0.8 Hot-rolled tubes 219 ±1.0 20 ±10 Mechanocal properties Standard code Models of steel tubes Tensile strengthMPa Yield strengthMPa Elongation GB/T5312 320 320∼410 ≥195 ≥25 360 360∼480 ≥215 ≥24 410 410∼530 ≥235 ≥22 460 460∼580 ≥265 ≥21 490 490∼610 ≥285 ≥21 Chemical compisition: Standard code Models of steel tubes Chemical compisition C Si Mn P S GB/T5312 320 ≤0.16 ≤0.35 0.40∼0.70 ≤0.035 ≤0.035 360 ≤0.17 ≤0.35 0.40∼0.80 ≤0.035 ≤0.035 410 ≤0.21 ≤0.35 0.40∼1.20 ≤0.035 ≤0.035 460 ≤0.22 ≤0.35 0.80∼1.40 ≤0.035 ≤0.030 490 ≤0.23 ≤0.35 0.80∼1.50 ≤0.035 ≤0.030 Noteresidual elements:Cr≤0.25,Mo≤0.10,Ni≤0.30,Cu≤0.30aggregate≤0.70

Category: barco tubo

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