Other Tubes
SA210 A1(C) & SA213 T2 T12 Multi-Lead Rifled Seamless Tube
SA210 A1(C) & SA213 T2 T12 Multi-Lead Rifled Seamless Tube
Short Description:
The main materials of Multi-Lead Rifled Seamless Tube: 20G, SA-210 A1, SA-210 C, SA-213 T2, SA-213 T12, 12Cr1MoVG, 15CrMoG, SA-213 T22, SA-213 T23, etc.
Product introduction
Multi-Lead Rifled Seamless Tube is a seamless steel tube with thread-like channels rolled on the inner surface of the boiler evaporation heating surface.
The main materials of Multi-Lead Rifled Seamless Tube:
20G, SA-210 A1, SA-210 C, SA-213 T2, SA-213 T12, 12Cr1MoVG, 15CrMoG, SA-213 T22, SA-213 T23, SA213 T91 etc.
①SA210 A1(C) & SA213 T2 T12 multi-lead rifled seamless tube is suitable for the manufacture of power station boiler water wall, which can effectively eliminate the steam film on the inner wall of the steel pipe and improve the thermal efficiency of the furnace wall.
②SA210 A1(C) & SA213 T2 T12 multi-lead rifled seamless tube is manufactured by cold drawing method, so that the inner wall of the steel pipe forms a special geometrical inner wall spiral rib. The finished product adopts protective gas heat treatment, so that the steel pipe has stable performance and good surface quality.
③Multi-lead rifled seamless tube can be ordered according to user requirements.
Multi-Lead Rifled Seamless Tube Quick Details
Manufacture:Seamless process, cold drawn
Material (Grade): 20G, SA-210 A1, SA-210 C, SA-213 T2, SA-213 T12, 12Cr1MoVG, 15CrMoG, SA-213 T22, SA-213 T23,SA-213 T91 etc.
Wall thickness(WT): 2.8 mm-12.7 mm.
Outer diameter (OD): 23 mm-127 mm
Common specifications: Φ28.6×6.2, Φ38.1×7.5, Φ63.5×7.5, Φ66.7×8, etc.
Length: 6M or specified length as required.
Ends: Plain End, Beveled End, Threaded
Additional Info
Port of Shipment: Tianjin, China
Payment Terms: T/T, LC
Delivery: 7-15 days after payment
Surface: Tubes will be varnished (Outside only) to prevent rust.
Marking: Standard + Steel Grade + Size + Heat No + Lot No
Package: Bundles (hexagonal), Wooden Boxes, Crates (steel/wooden) or as required
Technical requirements of SA210 A1(C) & SA213 T2 T12 multi-lead rifled seamless tube
The multi-lead rifled seamless tube used for high-pressure boilers should not only meet the general requirements of smooth tubes, but also in accordance with the standard requirements of GB/T 20409-2006 “Multi-lead rifled seamless steel tube for high-pressure boilers” or the procurement specifications of each boiler manufacturer. There are different regulations for its size and thread parameter deviation.
Standard:
GB/T 20409-2018 multi-lead rifled seamless steel tube for high pressure boiler
Chemical composition of Multi-Lead Rifled Seamless Tube (%)
| Material (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 |
Mechanical properties of Multi-Lead Rifled Seamless Tube
| Material (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 |
Heat treatment system of Multi-Lead Rifled Seamless Tube
| Material (Grade) | Heat treatment |
| 20G | Normalizing at 900℃~930℃, the holding time is 1min/mm according to the wall thickness, but should not be less than 12min. |
| 20MnG | Normalizing at 900℃~930℃, the holding time is 1min/mm according to the wall thickness, but should not be less than 12min. |
| 25MnG | Normalizing at 900℃~930℃, the holding time is 1min/mm according to the wall thickness, but should not be less than 12min. |
| 12CrMoG | 900°C~930°C normalizing; 670°C~720°C tempering, holding time: Periodic furnace is more than 2h, continuous furnace is more than 1h. |
| 15CrMoG | Normalizing at 930°C~960°C; tempering at 680°C~720°C, holding time: periodic furnace greater than 2h, continuous furnace greater than 1h. |
Multi-Lead Rifled Seamless Tube (referred to as internal threaded tube) refers to a seamless steel tube whose inner wall is processed into spiral grooves.
At present, in the large-capacity subcritical and supercritical thermal power boilers of 300 MW, 600 MW and above designed by our country or imported from abroad, the membrane water wall generally adopts Multi-Lead Rifled Seamless Tube.
Multi-Lead Rifled Seamless Tube Compared with ordinary smooth tubes, Multi-Lead Rifled Seamless Tube can effectively prevent the formation of a vapor film between water and the pipe wall, increase the disturbance of the flow in the steel pipe, and make the temperature of the pipe wall more uniform. The steel pipe burns out, which improves the heat transfer efficiency of the boiler.
The thread number of Multi-Lead Rifled Seamless Tube can be 4, 6, 8, or 12 according to the needs.