Низкого и среднего давления котла труб

Seamless Steel Low and Medium Pressure Boiler Pipe 1. Standard: ASTM A210(ASME SA 210), JIS G3461, DIN 17175, BS 3059 2. Surface: oiled or black painteed to prevent rust 3. Material: A53-A, A135-A, A106-A, B, A179-C, A241-C, A192, A226, A315-B, A53-B 4. Model N.O. of major steel tubes: 10, 20, 12CrMo, 1Cr5Mo, 1Cr19Ni9, etc Commonly used steel grade: 1o, 20. Mechanical properties Standard codes Models of steel tubes Tensile strength MPa Yield strength MPa Extensibility JImpact power J Hardness HB Condition GB9948 10 33490 ≥205 ≥24 / / Normalized 20 410550 ≥245 ≥21 ≥39 / Normalized 15CrMo 440640 ≥235 ≥21 ≥47 ≤170 Normalized/ Annealed 1Cr2Mo ≥390 ≥175 ≥22 ≥92 ≤179 Normalized/ Annealed 1Cr2Mo ≥390 ≥195 ≥22 ≥92 ≤187 Normalized Chemical composition Standard codes Models of steel tubes Chemical compositionsC Si Mn P S Cr Mo Ni GB994810 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 ≤0.030 1Cr2Mo ≤0.15 0.501.00 0.300.60 ≤0.035 ≤0.030 2.152.85 0.450.65 / 1Cr5Mo ≤0.15 ≤0.035 ≤0.60 ≤0.035 ≤0.030 4.006.00 0.450.60 ≤0.60