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StandardsGB5310 Chinese national standard
Applicationoperating temperature below 450 oc)as the pipes on the heated sides of high·pressure boilers,economizers,overheaters,reheaters and pipesfor petrochemical industry(with the operating pressure above 9.8Mpa and operating temperature ranging between 450~C~650~C1
Specifications of major steel
20G,20MnG,25MnG,15CrMoG,12Cr2MoG,12Cr1MoVG,12Cr2MoWVTiB,10Cr9Mo1VNb,
Mechanical properties:
20MnG | ≥415 | ≥240 | ≥22 | / | |
25MnG | ≥485 | ≥275 | ≥20 | / | |
15CrMoG | 440∼640 | ≥235 | ≥21 | / | |
12Cr2MoG | 450∼600 | ≥280 | ≥20 | / | |
12Cr1MoVG | 470∼640 | ≥255 | ≥21 | / | |
12Cr2MoWVTiB | 540∼735 | ≥345 | ≥18 | / | |
10Cr9Mo1VNb | ≥585 | ≥415 | ≥20 | / |
Chemical composition:
GB5310 | 20G | 0.17∼0.24 | 0.17∼0.37 | 0.35∼0.65 | ≤0.030 | ≤0.030 | ≤0.25 | ≤0.15 | ≤0.20 | ≤0.25 | ≤0.08 | |||||
20MnG | 0.17∼0.24 | 0.17∼0.37 | 0.70∼1.00 | ≤0.030 | ≤0.030 | ≤0.25 | ≤0.15 | ≤0.20 | ≤0.25 | ≤0.08 | ||||||
25MnG | 0.18∼0.24 | 0.17∼0.37 | 0.80∼1.10 | ≤0.030 | ≤0.030 | ≤0.25 | ≤0.15 | ≤0.20 | ≤0.25 | ≤0.08 | ||||||
15CrMo | 0.12∼0.18 | 0.17∼0.37 | 0.40∼0.70 | ≤0.030 | ≤0.030 | 0.80∼1.10 | 0.40∼0.55 | ≤0.20 | ≤0.30 | |||||||
12Cr2MoG | 0.08∼0.15 | ≤0.50 | 0.40∼0.70 | ≤0.030 | ≤0.030 | 2.00∼2.50 | 0.90∼1.20 | ≤0.20 | ≤0.30 | |||||||
12Cr1MoV | 0.08∼0.15 | 0.17∼0.37 | 0.40∼0.70 | ≤0.030 | ≤0.030 | 0.90∼1.20 | 0.25∼0.35 | ≤0.20 | ≤0.30 | 0.15∼0.30 | ||||||
12Cr2MoWVTiB | 0.08∼0.15 | 0.45∼0.75 | 0.45∼0.65 | ≤0.030 | ≤0.030 | 1.60∼2.10 | 0.50∼0.65 | ≤0.20 | ≤0.30 | 0.28∼0.42 | 0.30∼0.55 | 0.08∼0.15 | B 0.002∼0.008 | |||
10Cr9Mo1VNb | 0.08∼0.12 | 0.20∼0.50 | 0.30∼0.60 | ≤0.020 | ≤0.010 | 8.00∼9.50 | 0.85∼1.05 | ≤0.20 | ≤0.40 | 0.18∼0.25 | ≤0.015 | 0.06∼0.10 | 0.03∼0.07 |
GB5310 Seamless steel pipes for high pressure boilers