Petróleo tubo de grietas

Standard: GB9948 Chinese national standard Application: Served as for furnace tubes,heat exchange tubes and pipelines in petroleum and refinery plants Model No.of major steel tubes: 1n 9n 1Er!rMn 1rhMn 1f:hM0 etC Diamensional tolerances: Types of steel tubes Outer diameter Wall thickness Cold-rolled tubes Tube sizes(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 Mechanical properties: Standard codes Models of steel tubes TENSILE STRENGTHMPa YIELD POINTMPa Elongation Impact testJ Brinell hardnessHB Delivery Status GB9948 10 330490 ≥205 ≥24 / / Normalizing 20 410550 ≥245 ≥21 ≥39 / Normalizing 15CrMo 440640 ≥235 ≥21 ≥47 ≤170 Normalizing+Tempering 1Cr2Mo ≥390 ≥175 ≥22 ≥92 ≤179 Normalizing+Tempering 1Cr5Mo ≥390 ≥195 ≥22 ≥92 ≤187 Annealing Chemical composition: Standard codes Models of steel tubes Chemical compositions C Si Mn P S Cr Mo Ni GB9948 10 0.070.14 0.170.37 0.350.65 ≤0.035 ≤0.035 ≤0.15 / ≤0.25 20 0.170.24 0.170.37 0.350.65 ≤0.035 ≤0.035 ≤0.25 / ≤0.25 15CrMo 0.120.18 0.170.37 0.400.70 ≤0.035 ≤0.035 0.801.10 0.400.55 ≤0.30 1Cr2Mo ≤0.15 0.501.00 0.300.60 ≤0.035 ≤0.030 2.152.85 0.450.65 / 1Cr5Mo ≤0.15 ≤0.50 ≤0.60 ≤0.035 ≤0.030 4.006.00 0.450.60 ≤0.60

Category: Petróleo tubo de grietas

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