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 Detail

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SA210 A1(C) & SA213 T2 T12 Multi-Lead Rifled Seamless Tube
 
 
1. 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.

Multi-Lead Rifled Seamless Tube is mostly used in the manufacture of boiler wall water-cooled wall tubes. It is the main heat exchange component of power station boilers. It rotates the water in the tube through the spiral ribs on the inner wall of the tube, thereby destroying the heat transfer process. Membrane effect to achieve the effect of nucleate boiling.
 
Multi-Lead Rifled Seamless Tube is divided into ordinary Rifled Seamless Tube and optimized Rifled Seamless Tube. Ordinary internal threaded pipe is divided into A type and B type, the helix angle is 30°, which can improve the heat transfer efficiency by 30% compared with ordinary round pipe.
 
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.

Standard
GB5310-2008
GB/T 20409-2006
ASME SA-210M-2015
ASME SA-213M-2015
 
Product Specification Range:
Outer diameter: Φ22mm~Φ82.6mm;
Wall thickness: 4.0mm~16.0mm.
 

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, Treaded
 
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
 
 


 
2. 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
 

 
3. the 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
 
 
 
4.the 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
 
 
 5. 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.

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