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Boiler tubes design is crucial for efficiency of power generation in thermal power plant. As important component of heating surface, internally rifled tube is widely used to build waterwall for subcritical boiler, supercritical boiler, sliding pressure once-through boiler or heat recovery steam generator (HRSG). It is also named multi lead rifle tube (MLR tube). Due to its internal ribs of helical pattern, internally rifled boiler tube could suppress heat transfer deterioration by increasing turbulence of two phase flow: liquid water and steam vapor in mixture inside waterwall tube. This special waterwall tube is designed for high pressure, high temperature application in modern large utility boilers.
20G, SA210C, SA210A1, 15CrMoG, 12Cr1MoVG, T2, T12, T22, T23, T91, etc.
Seamless internally rifled tube for high pressure boiler not only needs to meet the general requirement for bare tube, but also keeps in accordance with national standard for rifled tube.
GB5310-2008
GB/T 20409-2006
ASME SA-210M-2015
ASME SA-213M-2015
Outer diameter: 22 to 82.6mm
Wall thickness: 4.0 to 16.0mm
Length: normally within 12m, in special case up to 20m.
Grade C Mn Si Cr Mo S P
20G 0.17~0.23 0.35~0.65 0.17~0.37 -- -- ≤0.020 ≤0.025
20MnG 0.17~0.23 0.70~1.00 0.17~0.37 -- -- ≤0.020 ≤0.025
25MnG 0.22~0.29 0.70~1.00 0.17~0.37 -- -- ≤0.020 ≤0.025
12CrMoG 0.08~0.15 0.40~0.70 0.17~0.37 0.40~0.70 0.40~0.55 ≤0.020 ≤0.025
15CrMoG 0.12~0.18 0.40~0.70 0.17~0.37 0.80~1.10 0.40~0.55 ≤0.020 ≤0.025
SA-210A1 ≤0.27 ≤0.93 ≥0.10 -- -- ≤0.035 ≤0.035
SA-210C ≤0.35 0.29~1.06 ≥0.10 -- -- ≤0.035 ≤0.035
SA-213T2 0.10~0.20 0.30~0.61 0.10~0.30 0.50~0.81 0.44~0.65 ≤0.025 ≤0.025
SA-213T12 0.05~0.15 0.30~0.61 ≤0.50 0.80~1.25 0.44~0.65 ≤0.025 ≤0.025
| Grade | Tensile strength (MPa) | Yield strength (MPa) | Elongation (%) | Hardness |
| 20G | 410~550 | ≥245 | ≥24 | -- |
| 20MnG | ≥415 | ≥240 | ≥22 | -- |
| 25MnG | ≥485 | ≥275 | ≥20 | -- |
| 12CrMoG | 410~560 | ≥205 | ≥21 | -- |
| 15CrMoG | 440~640 | ≥235 | ≥21 | -- |
| SA-210C | ≥415 | ≥255 | ≥30 | ≤143HBW |
| SA-210A1 | ≥485 | ≥275 | ≥30 | ≤179HBW |
| SA-213T2 | ≥415 | ≥205 | ≥30 | ≤163HBW |
| SA-213T12 | ≥415 | ≥220 | ≥30 | ≤163HBW |
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